// Package sqlite provides SQLite-based repository implementations.
package sqlite

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"strings"
	"time"

	"github.com/google/uuid"

	commonsqlite "github.com/kandev/kandev/internal/common/sqlite"
	"github.com/kandev/kandev/internal/task/models"
)

// Turn operations

// CreateTurn creates a new turn
func (r *Repository) CreateTurn(ctx context.Context, turn *models.Turn) error {
	if turn.ID == "" {
		turn.ID = uuid.New().String()
	}
	now := time.Now().UTC()
	if turn.StartedAt.IsZero() {
		turn.StartedAt = now
	}
	if turn.CreatedAt.IsZero() {
		turn.CreatedAt = now
	}
	turn.UpdatedAt = now

	metadataJSON := "{}"
	if turn.Metadata != nil {
		metadataBytes, err := json.Marshal(turn.Metadata)
		if err != nil {
			return fmt.Errorf("failed to serialize turn metadata: %w", err)
		}
		metadataJSON = string(metadataBytes)
	}

	_, err := r.db.ExecContext(ctx, `
		INSERT INTO task_session_turns (id, task_session_id, task_id, started_at, completed_at, metadata, created_at, updated_at)
		VALUES (?, ?, ?, ?, ?, ?, ?, ?)
	`, turn.ID, turn.TaskSessionID, turn.TaskID, turn.StartedAt, turn.CompletedAt, metadataJSON, turn.CreatedAt, turn.UpdatedAt)

	return err
}

// GetTurn retrieves a turn by ID
func (r *Repository) GetTurn(ctx context.Context, id string) (*models.Turn, error) {
	turn := &models.Turn{}
	var metadataJSON string
	var completedAt sql.NullTime
	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_session_id, task_id, started_at, completed_at, metadata, created_at, updated_at
		FROM task_session_turns WHERE id = ?
	`, id).Scan(&turn.ID, &turn.TaskSessionID, &turn.TaskID, &turn.StartedAt, &completedAt, &metadataJSON, &turn.CreatedAt, &turn.UpdatedAt)
	if err != nil {
		return nil, err
	}
	if completedAt.Valid {
		turn.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &turn.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize turn metadata: %w", err)
		}
	}
	return turn, nil
}

// GetActiveTurnBySessionID gets the currently active (non-completed) turn for a session
func (r *Repository) GetActiveTurnBySessionID(ctx context.Context, sessionID string) (*models.Turn, error) {
	turn := &models.Turn{}
	var metadataJSON string
	var completedAt sql.NullTime
	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_session_id, task_id, started_at, completed_at, metadata, created_at, updated_at
		FROM task_session_turns
		WHERE task_session_id = ? AND completed_at IS NULL
		ORDER BY started_at DESC LIMIT 1
	`, sessionID).Scan(&turn.ID, &turn.TaskSessionID, &turn.TaskID, &turn.StartedAt, &completedAt, &metadataJSON, &turn.CreatedAt, &turn.UpdatedAt)
	if err != nil {
		return nil, err
	}
	if completedAt.Valid {
		turn.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &turn.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize turn metadata: %w", err)
		}
	}
	return turn, nil
}

// UpdateTurn updates an existing turn
func (r *Repository) UpdateTurn(ctx context.Context, turn *models.Turn) error {
	turn.UpdatedAt = time.Now().UTC()

	metadataJSON := "{}"
	if turn.Metadata != nil {
		metadataBytes, err := json.Marshal(turn.Metadata)
		if err != nil {
			return fmt.Errorf("failed to serialize turn metadata: %w", err)
		}
		metadataJSON = string(metadataBytes)
	}

	_, err := r.db.ExecContext(ctx, `
		UPDATE task_session_turns
		SET completed_at = ?, metadata = ?, updated_at = ?
		WHERE id = ?
	`, turn.CompletedAt, metadataJSON, turn.UpdatedAt, turn.ID)

	return err
}

// CompleteTurn marks a turn as completed with the current time
func (r *Repository) CompleteTurn(ctx context.Context, id string) error {
	now := time.Now().UTC()
	_, err := r.db.ExecContext(ctx, `
		UPDATE task_session_turns
		SET completed_at = ?, updated_at = ?
		WHERE id = ?
	`, now, now, id)
	return err
}

// ListTurnsBySession returns all turns for a session ordered by start time
func (r *Repository) ListTurnsBySession(ctx context.Context, sessionID string) ([]*models.Turn, error) {
	rows, err := r.db.QueryContext(ctx, `
		SELECT id, task_session_id, task_id, started_at, completed_at, metadata, created_at, updated_at
		FROM task_session_turns WHERE task_session_id = ? ORDER BY started_at ASC
	`, sessionID)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	var result []*models.Turn
	for rows.Next() {
		turn := &models.Turn{}
		var metadataJSON string
		var completedAt sql.NullTime
		err := rows.Scan(&turn.ID, &turn.TaskSessionID, &turn.TaskID, &turn.StartedAt, &completedAt, &metadataJSON, &turn.CreatedAt, &turn.UpdatedAt)
		if err != nil {
			return nil, err
		}
		if completedAt.Valid {
			turn.CompletedAt = &completedAt.Time
		}
		if metadataJSON != "" && metadataJSON != "{}" {
			if err := json.Unmarshal([]byte(metadataJSON), &turn.Metadata); err != nil {
				return nil, fmt.Errorf("failed to deserialize turn metadata: %w", err)
			}
		}
		result = append(result, turn)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return result, nil
}

// Task Session operations

// CreateTaskSession creates a new agent session
func (r *Repository) CreateTaskSession(ctx context.Context, session *models.TaskSession) error {
	if session.ID == "" {
		session.ID = uuid.New().String()
	}
	now := time.Now().UTC()
	session.StartedAt = now
	session.UpdatedAt = now
	if session.State == "" {
		session.State = models.TaskSessionStateCreated
	}

	metadataJSON, err := json.Marshal(session.Metadata)
	if err != nil {
		return fmt.Errorf("failed to serialize agent session metadata: %w", err)
	}
	agentProfileSnapshotJSON, err := json.Marshal(session.AgentProfileSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize agent profile snapshot: %w", err)
	}
	executorSnapshotJSON, err := json.Marshal(session.ExecutorSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize executor snapshot: %w", err)
	}
	environmentSnapshotJSON, err := json.Marshal(session.EnvironmentSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize environment snapshot: %w", err)
	}
	repositorySnapshotJSON, err := json.Marshal(session.RepositorySnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize repository snapshot: %w", err)
	}
	_, err = r.db.ExecContext(ctx, `
		INSERT INTO task_sessions (
			id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
			repository_id, base_branch,
			agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
			state, error_message, metadata, started_at, completed_at, updated_at,
			is_primary, workflow_step_id, review_status
		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
	`, session.ID, session.TaskID, session.AgentExecutionID, session.ContainerID, session.AgentProfileID,
		session.ExecutorID, session.EnvironmentID, session.RepositoryID, session.BaseBranch,
		string(agentProfileSnapshotJSON), string(executorSnapshotJSON), string(environmentSnapshotJSON), string(repositorySnapshotJSON),
		string(session.State), session.ErrorMessage, string(metadataJSON),
		session.StartedAt, session.CompletedAt, session.UpdatedAt,
		commonsqlite.BoolToInt(session.IsPrimary), session.WorkflowStepID, session.ReviewStatus)

	return err
}

// GetTaskSession retrieves an agent session by ID
func (r *Repository) GetTaskSession(ctx context.Context, id string) (*models.TaskSession, error) {
	session := &models.TaskSession{}
	var state string
	var metadataJSON string
	var agentProfileSnapshotJSON string
	var executorSnapshotJSON string
	var environmentSnapshotJSON string
	var repositorySnapshotJSON string
	var completedAt sql.NullTime
	var isPrimary int
	var workflowStepID sql.NullString
	var reviewStatus sql.NullString

	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE id = ?
	`, id).Scan(
		&session.ID, &session.TaskID, &session.AgentExecutionID, &session.ContainerID, &session.AgentProfileID,
		&session.ExecutorID, &session.EnvironmentID,
		&session.RepositoryID, &session.BaseBranch,
		&agentProfileSnapshotJSON, &executorSnapshotJSON, &environmentSnapshotJSON, &repositorySnapshotJSON,
		&state, &session.ErrorMessage, &metadataJSON, &session.StartedAt, &completedAt, &session.UpdatedAt,
		&isPrimary, &workflowStepID, &reviewStatus,
	)

	if err == sql.ErrNoRows {
		return nil, fmt.Errorf("agent session not found: %s", id)
	}
	if err != nil {
		return nil, err
	}

	session.State = models.TaskSessionState(state)
	session.IsPrimary = isPrimary == 1
	if workflowStepID.Valid {
		session.WorkflowStepID = &workflowStepID.String
	}
	if reviewStatus.Valid {
		session.ReviewStatus = &reviewStatus.String
	}
	if completedAt.Valid {
		session.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &session.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent session metadata: %w", err)
		}
	}
	if agentProfileSnapshotJSON != "" && agentProfileSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(agentProfileSnapshotJSON), &session.AgentProfileSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent profile snapshot: %w", err)
		}
	}
	if executorSnapshotJSON != "" && executorSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(executorSnapshotJSON), &session.ExecutorSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize executor snapshot: %w", err)
		}
	}
	if environmentSnapshotJSON != "" && environmentSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(environmentSnapshotJSON), &session.EnvironmentSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize environment snapshot: %w", err)
		}
	}
	if repositorySnapshotJSON != "" && repositorySnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(repositorySnapshotJSON), &session.RepositorySnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize repository snapshot: %w", err)
		}
	}

	worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to load session worktrees: %w", err)
	}
	session.Worktrees = worktrees

	return session, nil
}

// GetTaskSessionByTaskID retrieves the most recent agent session for a task
func (r *Repository) GetTaskSessionByTaskID(ctx context.Context, taskID string) (*models.TaskSession, error) {
	session := &models.TaskSession{}
	var state string
	var metadataJSON string
	var agentProfileSnapshotJSON string
	var executorSnapshotJSON string
	var environmentSnapshotJSON string
	var repositorySnapshotJSON string
	var completedAt sql.NullTime
	var isPrimary int
	var workflowStepID sql.NullString
	var reviewStatus sql.NullString

	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE task_id = ? ORDER BY started_at DESC LIMIT 1
	`, taskID).Scan(
		&session.ID, &session.TaskID, &session.AgentExecutionID, &session.ContainerID, &session.AgentProfileID,
		&session.ExecutorID, &session.EnvironmentID,
		&session.RepositoryID, &session.BaseBranch,
		&agentProfileSnapshotJSON, &executorSnapshotJSON, &environmentSnapshotJSON, &repositorySnapshotJSON,
		&state, &session.ErrorMessage, &metadataJSON, &session.StartedAt, &completedAt, &session.UpdatedAt,
		&isPrimary, &workflowStepID, &reviewStatus,
	)

	if err == sql.ErrNoRows {
		return nil, fmt.Errorf("agent session not found for task: %s", taskID)
	}
	if err != nil {
		return nil, err
	}

	session.State = models.TaskSessionState(state)
	session.IsPrimary = isPrimary == 1
	if workflowStepID.Valid {
		session.WorkflowStepID = &workflowStepID.String
	}
	if reviewStatus.Valid {
		session.ReviewStatus = &reviewStatus.String
	}
	if completedAt.Valid {
		session.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &session.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent session metadata: %w", err)
		}
	}
	if agentProfileSnapshotJSON != "" && agentProfileSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(agentProfileSnapshotJSON), &session.AgentProfileSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent profile snapshot: %w", err)
		}
	}
	if executorSnapshotJSON != "" && executorSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(executorSnapshotJSON), &session.ExecutorSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize executor snapshot: %w", err)
		}
	}
	if environmentSnapshotJSON != "" && environmentSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(environmentSnapshotJSON), &session.EnvironmentSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize environment snapshot: %w", err)
		}
	}
	if repositorySnapshotJSON != "" && repositorySnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(repositorySnapshotJSON), &session.RepositorySnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize repository snapshot: %w", err)
		}
	}

	worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to load session worktrees: %w", err)
	}
	session.Worktrees = worktrees

	return session, nil
}

// GetActiveTaskSessionByTaskID retrieves the active (running/waiting) agent session for a task
func (r *Repository) GetActiveTaskSessionByTaskID(ctx context.Context, taskID string) (*models.TaskSession, error) {
	session := &models.TaskSession{}
	var state string
	var metadataJSON string
	var agentProfileSnapshotJSON string
	var executorSnapshotJSON string
	var environmentSnapshotJSON string
	var repositorySnapshotJSON string
	var completedAt sql.NullTime
	var isPrimary int
	var workflowStepID sql.NullString
	var reviewStatus sql.NullString

	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions
		WHERE task_id = ? AND state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT')
		ORDER BY started_at DESC LIMIT 1
	`, taskID).Scan(
		&session.ID, &session.TaskID, &session.AgentExecutionID, &session.ContainerID, &session.AgentProfileID,
		&session.ExecutorID, &session.EnvironmentID,
		&session.RepositoryID, &session.BaseBranch,
		&agentProfileSnapshotJSON, &executorSnapshotJSON, &environmentSnapshotJSON, &repositorySnapshotJSON,
		&state, &session.ErrorMessage, &metadataJSON, &session.StartedAt, &completedAt, &session.UpdatedAt,
		&isPrimary, &workflowStepID, &reviewStatus,
	)

	if err == sql.ErrNoRows {
		return nil, fmt.Errorf("no active agent session for task: %s", taskID)
	}
	if err != nil {
		return nil, err
	}

	session.State = models.TaskSessionState(state)
	session.IsPrimary = isPrimary == 1
	if workflowStepID.Valid {
		session.WorkflowStepID = &workflowStepID.String
	}
	if reviewStatus.Valid {
		session.ReviewStatus = &reviewStatus.String
	}
	if completedAt.Valid {
		session.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &session.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent session metadata: %w", err)
		}
	}
	if agentProfileSnapshotJSON != "" && agentProfileSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(agentProfileSnapshotJSON), &session.AgentProfileSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent profile snapshot: %w", err)
		}
	}
	if executorSnapshotJSON != "" && executorSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(executorSnapshotJSON), &session.ExecutorSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize executor snapshot: %w", err)
		}
	}
	if environmentSnapshotJSON != "" && environmentSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(environmentSnapshotJSON), &session.EnvironmentSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize environment snapshot: %w", err)
		}
	}
	if repositorySnapshotJSON != "" && repositorySnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(repositorySnapshotJSON), &session.RepositorySnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize repository snapshot: %w", err)
		}
	}

	worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to load session worktrees: %w", err)
	}
	session.Worktrees = worktrees

	return session, nil
}

// UpdateTaskSession updates an existing agent session
func (r *Repository) UpdateTaskSession(ctx context.Context, session *models.TaskSession) error {
	session.UpdatedAt = time.Now().UTC()

	metadataJSON, err := json.Marshal(session.Metadata)
	if err != nil {
		return fmt.Errorf("failed to serialize agent session metadata: %w", err)
	}
	agentProfileSnapshotJSON, err := json.Marshal(session.AgentProfileSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize agent profile snapshot: %w", err)
	}
	executorSnapshotJSON, err := json.Marshal(session.ExecutorSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize executor snapshot: %w", err)
	}
	environmentSnapshotJSON, err := json.Marshal(session.EnvironmentSnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize environment snapshot: %w", err)
	}
	repositorySnapshotJSON, err := json.Marshal(session.RepositorySnapshot)
	if err != nil {
		return fmt.Errorf("failed to serialize repository snapshot: %w", err)
	}

	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET
			agent_execution_id = ?, container_id = ?, agent_profile_id = ?, executor_id = ?, environment_id = ?,
			repository_id = ?, base_branch = ?,
			agent_profile_snapshot = ?, executor_snapshot = ?, environment_snapshot = ?, repository_snapshot = ?,
			state = ?, error_message = ?, metadata = ?, completed_at = ?, updated_at = ?,
			is_primary = ?, workflow_step_id = ?, review_status = ?
		WHERE id = ?
	`, session.AgentExecutionID, session.ContainerID, session.AgentProfileID, session.ExecutorID, session.EnvironmentID,
		session.RepositoryID, session.BaseBranch,
		string(agentProfileSnapshotJSON), string(executorSnapshotJSON), string(environmentSnapshotJSON), string(repositorySnapshotJSON),
		string(session.State), session.ErrorMessage, string(metadataJSON), session.CompletedAt, session.UpdatedAt,
		commonsqlite.BoolToInt(session.IsPrimary), session.WorkflowStepID, session.ReviewStatus,
		session.ID)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("agent session not found: %s", session.ID)
	}
	return nil
}

// UpdateTaskSessionState updates just the state and error message of an agent session
func (r *Repository) UpdateTaskSessionState(ctx context.Context, id string, status models.TaskSessionState, errorMessage string) error {
	now := time.Now().UTC()

	var completedAt *time.Time
	if status == models.TaskSessionStateCompleted || status == models.TaskSessionStateFailed || status == models.TaskSessionStateCancelled {
		completedAt = &now
	}

	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET state = ?, error_message = ?, completed_at = ?, updated_at = ? WHERE id = ?
	`, string(status), errorMessage, completedAt, now, id)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("agent session not found: %s", id)
	}
	return nil
}

// ClearSessionExecutionID clears the agent_execution_id for a session.
// This is used when a stale execution ID needs to be removed (e.g., after a failed resume on startup).
func (r *Repository) ClearSessionExecutionID(ctx context.Context, id string) error {
	now := time.Now().UTC()
	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET agent_execution_id = '', container_id = '', updated_at = ? WHERE id = ?
	`, now, id)
	if err != nil {
		return err
	}
	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("agent session not found: %s", id)
	}
	return nil
}

// ListTaskSessions returns all agent sessions for a task
func (r *Repository) ListTaskSessions(ctx context.Context, taskID string) ([]*models.TaskSession, error) {
	rows, err := r.db.QueryContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE task_id = ? ORDER BY started_at DESC
	`, taskID)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	sessions, err := r.scanTaskSessions(ctx, rows)
	if err != nil {
		return nil, err
	}
	for _, session := range sessions {
		worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
		if err != nil {
			return nil, fmt.Errorf("failed to load session worktrees: %w", err)
		}
		session.Worktrees = worktrees
	}
	return sessions, nil
}

// ListActiveTaskSessions returns all active agent sessions across all tasks
func (r *Repository) ListActiveTaskSessions(ctx context.Context) ([]*models.TaskSession, error) {
	rows, err := r.db.QueryContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT') ORDER BY started_at DESC
	`)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	sessions, err := r.scanTaskSessions(ctx, rows)
	if err != nil {
		return nil, err
	}
	for _, session := range sessions {
		worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
		if err != nil {
			return nil, fmt.Errorf("failed to load session worktrees: %w", err)
		}
		session.Worktrees = worktrees
	}
	return sessions, nil
}

// ListActiveTaskSessionsByTaskID returns all active agent sessions for a specific task
func (r *Repository) ListActiveTaskSessionsByTaskID(ctx context.Context, taskID string) ([]*models.TaskSession, error) {
	rows, err := r.db.QueryContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE task_id = ? AND state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT') ORDER BY started_at DESC
	`, taskID)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	sessions, err := r.scanTaskSessions(ctx, rows)
	if err != nil {
		return nil, err
	}
	for _, session := range sessions {
		worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
		if err != nil {
			return nil, fmt.Errorf("failed to load session worktrees: %w", err)
		}
		session.Worktrees = worktrees
	}
	return sessions, nil
}

func (r *Repository) HasActiveTaskSessionsByAgentProfile(ctx context.Context, agentProfileID string) (bool, error) {
	var exists int
	err := r.db.QueryRowContext(ctx, `
		SELECT 1 FROM task_sessions
		WHERE agent_profile_id = ? AND state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT')
		LIMIT 1
	`, agentProfileID).Scan(&exists)
	if err == sql.ErrNoRows {
		return false, nil
	}
	return err == nil, err
}

func (r *Repository) HasActiveTaskSessionsByEnvironment(ctx context.Context, environmentID string) (bool, error) {
	var exists int
	err := r.db.QueryRowContext(ctx, `
		SELECT 1 FROM task_sessions
		WHERE environment_id = ? AND state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT')
		LIMIT 1
	`, environmentID).Scan(&exists)
	if err == sql.ErrNoRows {
		return false, nil
	}
	return err == nil, err
}

func (r *Repository) HasActiveTaskSessionsByRepository(ctx context.Context, repositoryID string) (bool, error) {
	var exists int
	err := r.db.QueryRowContext(ctx, `
		SELECT 1
		FROM task_sessions s
		INNER JOIN task_repositories tr ON tr.task_id = s.task_id
		WHERE s.state IN ('CREATED', 'STARTING', 'RUNNING', 'WAITING_FOR_INPUT')
			AND tr.repository_id = ?
		LIMIT 1
	`, repositoryID).Scan(&exists)
	if err == sql.ErrNoRows {
		return false, nil
	}
	return err == nil, err
}

// scanTaskSessions is a helper to scan multiple agent session rows
func (r *Repository) scanTaskSessions(ctx context.Context, rows *sql.Rows) ([]*models.TaskSession, error) {
	var result []*models.TaskSession
	for rows.Next() {
		session := &models.TaskSession{}
		var state string
		var metadataJSON string
		var agentProfileSnapshotJSON string
		var executorSnapshotJSON string
		var environmentSnapshotJSON string
		var repositorySnapshotJSON string
		var completedAt sql.NullTime
		var isPrimary int
		var workflowStepID sql.NullString
		var reviewStatus sql.NullString

		err := rows.Scan(
			&session.ID, &session.TaskID, &session.AgentExecutionID, &session.ContainerID, &session.AgentProfileID,
			&session.ExecutorID, &session.EnvironmentID,
			&session.RepositoryID, &session.BaseBranch,
			&agentProfileSnapshotJSON, &executorSnapshotJSON, &environmentSnapshotJSON, &repositorySnapshotJSON,
			&state, &session.ErrorMessage, &metadataJSON, &session.StartedAt, &completedAt, &session.UpdatedAt,
			&isPrimary, &workflowStepID, &reviewStatus,
		)
		if err != nil {
			return nil, err
		}

		session.State = models.TaskSessionState(state)
		session.IsPrimary = isPrimary == 1
		if workflowStepID.Valid {
			session.WorkflowStepID = &workflowStepID.String
		}
		if reviewStatus.Valid {
			session.ReviewStatus = &reviewStatus.String
		}
		if completedAt.Valid {
			session.CompletedAt = &completedAt.Time
		}
		if metadataJSON != "" && metadataJSON != "{}" {
			if err := json.Unmarshal([]byte(metadataJSON), &session.Metadata); err != nil {
				return nil, fmt.Errorf("failed to deserialize agent session metadata: %w", err)
			}
		}
		if agentProfileSnapshotJSON != "" && agentProfileSnapshotJSON != "{}" {
			if err := json.Unmarshal([]byte(agentProfileSnapshotJSON), &session.AgentProfileSnapshot); err != nil {
				return nil, fmt.Errorf("failed to deserialize agent profile snapshot: %w", err)
			}
		}
		if executorSnapshotJSON != "" && executorSnapshotJSON != "{}" {
			if err := json.Unmarshal([]byte(executorSnapshotJSON), &session.ExecutorSnapshot); err != nil {
				return nil, fmt.Errorf("failed to deserialize executor snapshot: %w", err)
			}
		}
		if environmentSnapshotJSON != "" && environmentSnapshotJSON != "{}" {
			if err := json.Unmarshal([]byte(environmentSnapshotJSON), &session.EnvironmentSnapshot); err != nil {
				return nil, fmt.Errorf("failed to deserialize environment snapshot: %w", err)
			}
		}
		if repositorySnapshotJSON != "" && repositorySnapshotJSON != "{}" {
			if err := json.Unmarshal([]byte(repositorySnapshotJSON), &session.RepositorySnapshot); err != nil {
				return nil, fmt.Errorf("failed to deserialize repository snapshot: %w", err)
			}
		}

		result = append(result, session)
	}
	return result, rows.Err()
}

// DeleteTaskSession deletes an agent session by ID
func (r *Repository) DeleteTaskSession(ctx context.Context, id string) error {
	result, err := r.db.ExecContext(ctx, `DELETE FROM task_sessions WHERE id = ?`, id)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("agent session not found: %s", id)
	}
	return nil
}

// Task Session Worktree operations

func (r *Repository) CreateTaskSessionWorktree(ctx context.Context, sessionWorktree *models.TaskSessionWorktree) error {
	if sessionWorktree.ID == "" {
		sessionWorktree.ID = uuid.New().String()
	}
	now := time.Now().UTC()
	sessionWorktree.CreatedAt = now
	updatedAt := now

	_, err := r.db.ExecContext(ctx, `
		INSERT INTO task_session_worktrees (
			id, session_id, worktree_id, repository_id, position,
			worktree_path, worktree_branch, created_at, updated_at
		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
		ON CONFLICT(session_id, worktree_id) DO UPDATE SET
			repository_id = excluded.repository_id,
			position = excluded.position,
			worktree_path = excluded.worktree_path,
			worktree_branch = excluded.worktree_branch,
			updated_at = excluded.updated_at
	`,
		sessionWorktree.ID,
		sessionWorktree.SessionID,
		sessionWorktree.WorktreeID,
		sessionWorktree.RepositoryID,
		sessionWorktree.Position,
		sessionWorktree.WorktreePath,
		sessionWorktree.WorktreeBranch,
		sessionWorktree.CreatedAt,
		updatedAt,
	)
	return err
}

func (r *Repository) ListTaskSessionWorktrees(ctx context.Context, sessionID string) ([]*models.TaskSessionWorktree, error) {
	rows, err := r.db.QueryContext(ctx, `
		SELECT
			tsw.id, tsw.session_id, tsw.worktree_id, tsw.repository_id, tsw.position,
			tsw.worktree_path, tsw.worktree_branch, tsw.created_at
		FROM task_session_worktrees tsw
		WHERE tsw.session_id = ?
		ORDER BY tsw.position ASC, tsw.created_at ASC
	`, sessionID)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	var worktrees []*models.TaskSessionWorktree
	for rows.Next() {
		var wt models.TaskSessionWorktree
		err := rows.Scan(
			&wt.ID,
			&wt.SessionID,
			&wt.WorktreeID,
			&wt.RepositoryID,
			&wt.Position,
			&wt.WorktreePath,
			&wt.WorktreeBranch,
			&wt.CreatedAt,
		)
		if err != nil {
			return nil, err
		}
		worktrees = append(worktrees, &wt)
	}
	return worktrees, rows.Err()
}

func (r *Repository) DeleteTaskSessionWorktree(ctx context.Context, id string) error {
	result, err := r.db.ExecContext(ctx, `DELETE FROM task_session_worktrees WHERE id = ?`, id)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("task session worktree not found: %s", id)
	}
	return nil
}

func (r *Repository) DeleteTaskSessionWorktreesBySession(ctx context.Context, sessionID string) error {
	_, err := r.db.ExecContext(ctx, `DELETE FROM task_session_worktrees WHERE session_id = ?`, sessionID)
	return err
}

// GetPrimarySessionByTaskID retrieves the primary session for a task
func (r *Repository) GetPrimarySessionByTaskID(ctx context.Context, taskID string) (*models.TaskSession, error) {
	session := &models.TaskSession{}
	var state string
	var metadataJSON string
	var agentProfileSnapshotJSON string
	var executorSnapshotJSON string
	var environmentSnapshotJSON string
	var repositorySnapshotJSON string
	var completedAt sql.NullTime
	var isPrimary int
	var workflowStepID sql.NullString
	var reviewStatus sql.NullString

	err := r.db.QueryRowContext(ctx, `
		SELECT id, task_id, agent_execution_id, container_id, agent_profile_id, executor_id, environment_id,
		       repository_id, base_branch,
		       agent_profile_snapshot, executor_snapshot, environment_snapshot, repository_snapshot,
		       state, error_message, metadata, started_at, completed_at, updated_at,
		       is_primary, workflow_step_id, review_status
		FROM task_sessions WHERE task_id = ? AND is_primary = 1 LIMIT 1
	`, taskID).Scan(
		&session.ID, &session.TaskID, &session.AgentExecutionID, &session.ContainerID, &session.AgentProfileID,
		&session.ExecutorID, &session.EnvironmentID,
		&session.RepositoryID, &session.BaseBranch,
		&agentProfileSnapshotJSON, &executorSnapshotJSON, &environmentSnapshotJSON, &repositorySnapshotJSON,
		&state, &session.ErrorMessage, &metadataJSON, &session.StartedAt, &completedAt, &session.UpdatedAt,
		&isPrimary, &workflowStepID, &reviewStatus,
	)

	if err == sql.ErrNoRows {
		return nil, fmt.Errorf("no primary session found for task: %s", taskID)
	}
	if err != nil {
		return nil, err
	}

	session.State = models.TaskSessionState(state)
	session.IsPrimary = isPrimary == 1
	if workflowStepID.Valid {
		session.WorkflowStepID = &workflowStepID.String
	}
	if reviewStatus.Valid {
		session.ReviewStatus = &reviewStatus.String
	}
	if completedAt.Valid {
		session.CompletedAt = &completedAt.Time
	}
	if metadataJSON != "" && metadataJSON != "{}" {
		if err := json.Unmarshal([]byte(metadataJSON), &session.Metadata); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent session metadata: %w", err)
		}
	}
	if agentProfileSnapshotJSON != "" && agentProfileSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(agentProfileSnapshotJSON), &session.AgentProfileSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize agent profile snapshot: %w", err)
		}
	}
	if executorSnapshotJSON != "" && executorSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(executorSnapshotJSON), &session.ExecutorSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize executor snapshot: %w", err)
		}
	}
	if environmentSnapshotJSON != "" && environmentSnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(environmentSnapshotJSON), &session.EnvironmentSnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize environment snapshot: %w", err)
		}
	}
	if repositorySnapshotJSON != "" && repositorySnapshotJSON != "{}" {
		if err := json.Unmarshal([]byte(repositorySnapshotJSON), &session.RepositorySnapshot); err != nil {
			return nil, fmt.Errorf("failed to deserialize repository snapshot: %w", err)
		}
	}

	worktrees, err := r.ListTaskSessionWorktrees(ctx, session.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to load session worktrees: %w", err)
	}
	session.Worktrees = worktrees

	return session, nil
}

// GetPrimarySessionIDsByTaskIDs returns a map of task ID to primary session ID for the given task IDs.
// Tasks without a primary session are not included in the result.
func (r *Repository) GetPrimarySessionIDsByTaskIDs(ctx context.Context, taskIDs []string) (map[string]string, error) {
	if len(taskIDs) == 0 {
		return make(map[string]string), nil
	}

	// Build placeholders for IN clause
	placeholders := make([]string, len(taskIDs))
	args := make([]interface{}, len(taskIDs))
	for i, id := range taskIDs {
		placeholders[i] = "?"
		args[i] = id
	}

	query := fmt.Sprintf(`
		SELECT id, task_id FROM task_sessions
		WHERE task_id IN (%s) AND is_primary = 1
	`, strings.Join(placeholders, ","))

	rows, err := r.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	result := make(map[string]string)
	for rows.Next() {
		var sessionID, taskID string
		if err := rows.Scan(&sessionID, &taskID); err != nil {
			return nil, err
		}
		result[taskID] = sessionID
	}
	return result, rows.Err()
}

// GetSessionCountsByTaskIDs returns a map of task ID to session count for the given task IDs.
func (r *Repository) GetSessionCountsByTaskIDs(ctx context.Context, taskIDs []string) (map[string]int, error) {
	if len(taskIDs) == 0 {
		return make(map[string]int), nil
	}

	// Build placeholders for IN clause
	placeholders := make([]string, len(taskIDs))
	args := make([]interface{}, len(taskIDs))
	for i, id := range taskIDs {
		placeholders[i] = "?"
		args[i] = id
	}

	query := fmt.Sprintf(`
		SELECT task_id, COUNT(*) as count FROM task_sessions
		WHERE task_id IN (%s)
		GROUP BY task_id
	`, strings.Join(placeholders, ","))

	rows, err := r.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	result := make(map[string]int)
	for rows.Next() {
		var taskID string
		var count int
		if err := rows.Scan(&taskID, &count); err != nil {
			return nil, err
		}
		result[taskID] = count
	}
	return result, rows.Err()
}

// GetPrimarySessionInfoByTaskIDs returns a map of task ID to primary session for the given task IDs.
// Only returns the review_status field from the session.
func (r *Repository) GetPrimarySessionInfoByTaskIDs(ctx context.Context, taskIDs []string) (map[string]*models.TaskSession, error) {
	if len(taskIDs) == 0 {
		return make(map[string]*models.TaskSession), nil
	}

	// Build placeholders for IN clause
	placeholders := make([]string, len(taskIDs))
	args := make([]interface{}, len(taskIDs))
	for i, id := range taskIDs {
		placeholders[i] = "?"
		args[i] = id
	}

	query := fmt.Sprintf(`
		SELECT task_id, review_status FROM task_sessions
		WHERE task_id IN (%s) AND is_primary = 1
	`, strings.Join(placeholders, ","))

	rows, err := r.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer func() { _ = rows.Close() }()

	result := make(map[string]*models.TaskSession)
	for rows.Next() {
		var taskID string
		var reviewStatus sql.NullString
		if err := rows.Scan(&taskID, &reviewStatus); err != nil {
			return nil, err
		}
		session := &models.TaskSession{
			TaskID: taskID,
		}
		if reviewStatus.Valid {
			session.ReviewStatus = &reviewStatus.String
		}
		result[taskID] = session
	}
	return result, rows.Err()
}

// SetSessionPrimary marks a session as primary and clears primary flag on other sessions for the same task
func (r *Repository) SetSessionPrimary(ctx context.Context, sessionID string) error {
	now := time.Now().UTC()

	// First, get the task_id for this session
	var taskID string
	err := r.db.QueryRowContext(ctx, `SELECT task_id FROM task_sessions WHERE id = ?`, sessionID).Scan(&taskID)
	if err == sql.ErrNoRows {
		return fmt.Errorf("session not found: %s", sessionID)
	}
	if err != nil {
		return err
	}

	// Clear primary flag on all sessions for this task
	_, err = r.db.ExecContext(ctx, `
		UPDATE task_sessions SET is_primary = 0, updated_at = ? WHERE task_id = ?
	`, now, taskID)
	if err != nil {
		return err
	}

	// Set primary flag on the specified session
	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET is_primary = 1, updated_at = ? WHERE id = ?
	`, now, sessionID)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("session not found: %s", sessionID)
	}
	return nil
}

// UpdateSessionWorkflowStep updates the workflow step for a session
func (r *Repository) UpdateSessionWorkflowStep(ctx context.Context, sessionID string, stepID string) error {
	now := time.Now().UTC()

	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET workflow_step_id = ?, updated_at = ? WHERE id = ?
	`, stepID, now, sessionID)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("session not found: %s", sessionID)
	}
	return nil
}

// UpdateSessionReviewStatus updates the review status of a session
func (r *Repository) UpdateSessionReviewStatus(ctx context.Context, sessionID string, status string) error {
	now := time.Now().UTC()

	result, err := r.db.ExecContext(ctx, `
		UPDATE task_sessions SET review_status = ?, updated_at = ? WHERE id = ?
	`, status, now, sessionID)
	if err != nil {
		return err
	}

	rows, _ := result.RowsAffected()
	if rows == 0 {
		return fmt.Errorf("session not found: %s", sessionID)
	}
	return nil
}