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

import (
	"fmt"

	"github.com/google/uuid"

	"github.com/kandev/kandev/internal/db/dialect"
)

// initSchema creates the database tables if they don't exist and applies
// pending migrations in order. Steps are sequenced through an explicit
// table so the call list stays readable as new schema/migration steps are
// added without growing the function's cyclomatic complexity.
func (r *Repository) initSchema() error {
	steps := []func() error{
		r.initCoreSchema,
		r.initPlansSchema,
		r.initDocumentsSchema,
		r.initSessionSchema,
		r.initGitSchema,
		r.initReviewSchema,
		r.migrateExecutorProfiles,
		r.migrateTaskSessions,
		r.ensureDefaultWorkspace,
		r.ensureDefaultExecutorsAndEnvironments,
		r.runMigrations,
		r.backfillTaskEnvironments,
		r.backfillTaskEnvironmentRepos,
		r.healTaskEnvironmentWorkspacePaths,
		r.healDuplicateTaskEnvironments,
		r.ensureTaskEnvironmentTaskUniqueIndex,
		r.healSessionTaskEnvironmentIDs,
		r.ensureWorkspaceIndexes,
		r.ensureMessageMetadataIndexes,
	}
	for _, step := range steps {
		if err := step(); err != nil {
			return err
		}
	}
	return nil
}

// ensureWorkspaceIndexes creates workspace-related indexes
func (r *Repository) ensureWorkspaceIndexes() error {
	if _, err := r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_tasks_workspace_id ON tasks(workspace_id)`); err != nil {
		return err
	}
	if _, err := r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_workflows_workspace_id ON workflows(workspace_id)`); err != nil {
		return err
	}
	if _, err := r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_tasks_workspace_archived ON tasks(workspace_id, archived_at)`); err != nil {
		return err
	}
	return nil
}

// ensureMessageMetadataIndexes creates indexes on JSON metadata fields for fast lookups.
func (r *Repository) ensureMessageMetadataIndexes() error {
	driver := r.db.DriverName()
	toolCallIndex := fmt.Sprintf(
		`CREATE INDEX IF NOT EXISTS idx_messages_metadata_tool_call_id ON task_session_messages(task_session_id, (%s))`,
		dialect.JSONExtract(driver, "metadata", "tool_call_id"),
	)
	if _, err := r.db.Exec(toolCallIndex); err != nil {
		return err
	}
	pendingIndex := fmt.Sprintf(
		`CREATE INDEX IF NOT EXISTS idx_messages_metadata_pending_id ON task_session_messages(task_session_id, (%s))`,
		dialect.JSONExtract(driver, "metadata", "pending_id"),
	)
	if _, err := r.db.Exec(pendingIndex); err != nil {
		return err
	}
	return nil
}

// ensureRunnerProjectionTables creates stub workflow_steps and
// workflow_step_participants tables if they're not yet present. The
// task repo's task SELECT projection includes a correlated subquery
// against both tables to resolve the per-task runner (ADR 0005 Wave F);
// when only the task repo is initialised (e.g. unit tests), the
// workflow repo hasn't created the canonical tables and the queries
// would error with "no such table". Stubs created here are minimal —
// the workflow repo's init still runs and adds the rest of its columns
// via idempotent ALTER and CREATE statements.
func (r *Repository) ensureRunnerProjectionTables() {
	// workflow_steps: matches the full schema declared in the workflow
	// repo so workflow.NewWithDB's later ALTER ADD COLUMNs become no-ops
	// (column-already-exists errors are swallowed). Mirrors
	// internal/workflow/repository/sqlite.go (the canonical owner).
	_, _ = r.db.Exec(`
		CREATE TABLE IF NOT EXISTS workflow_steps (
			id TEXT PRIMARY KEY,
			workflow_id TEXT NOT NULL DEFAULT '',
			name TEXT NOT NULL DEFAULT '',
			position INTEGER NOT NULL DEFAULT 0,
			color TEXT,
			prompt TEXT,
			events TEXT,
			allow_manual_move INTEGER DEFAULT 1,
			is_start_step INTEGER DEFAULT 0,
			show_in_command_panel INTEGER DEFAULT 1,
			auto_archive_after_hours INTEGER DEFAULT 0,
			agent_profile_id TEXT NOT NULL DEFAULT '',
			stage_type TEXT NOT NULL DEFAULT 'custom',
			created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
			updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
		)`)
	_, _ = r.db.Exec(`
		CREATE TABLE IF NOT EXISTS workflow_step_participants (
			id TEXT PRIMARY KEY,
			step_id TEXT NOT NULL DEFAULT '',
			task_id TEXT NOT NULL DEFAULT '',
			role TEXT NOT NULL DEFAULT '',
			agent_profile_id TEXT NOT NULL DEFAULT '',
			decision_required INTEGER NOT NULL DEFAULT 0,
			position INTEGER NOT NULL DEFAULT 0
		)`)
}

func (r *Repository) initCoreSchema() error {
	if err := r.initInfraSchema(); err != nil {
		return err
	}
	if err := r.initTaskSchema(); err != nil {
		return err
	}
	return r.initCoreIndexes()
}

// infraSchemaDDL is the concatenated CREATE TABLE block for infrastructure
// tables (workspaces, executors, environments, workflows). Kept as a single
// DDL string so the table layout reads top-to-bottom; lives in a const so the
// owning function stays within the funlen limit.
const infraSchemaDDL = `
	CREATE TABLE IF NOT EXISTS workspaces (
		id TEXT PRIMARY KEY,
		name TEXT NOT NULL,
		description TEXT DEFAULT '',
		owner_id TEXT DEFAULT '',
		default_executor_id TEXT DEFAULT '',
		default_environment_id TEXT DEFAULT '',
		default_agent_profile_id TEXT DEFAULT '',
		default_config_agent_profile_id TEXT DEFAULT '',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL
	);

	CREATE TABLE IF NOT EXISTS executors (
		id TEXT PRIMARY KEY,
		name TEXT NOT NULL,
		type TEXT NOT NULL,
		status TEXT NOT NULL DEFAULT 'active',
		is_system INTEGER NOT NULL DEFAULT 0,
		resumable INTEGER NOT NULL DEFAULT 1,
		config TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		deleted_at TIMESTAMP
	);

	CREATE TABLE IF NOT EXISTS executors_running (
		id TEXT PRIMARY KEY,
		session_id TEXT NOT NULL UNIQUE,
		task_id TEXT NOT NULL,
		executor_id TEXT NOT NULL,
		runtime TEXT DEFAULT '',
		status TEXT NOT NULL DEFAULT 'starting',
		resumable INTEGER NOT NULL DEFAULT 0,
		resume_token TEXT DEFAULT '',
		agent_execution_id TEXT DEFAULT '',
		container_id TEXT DEFAULT '',
		agentctl_url TEXT DEFAULT '',
		agentctl_port INTEGER DEFAULT 0,
		pid INTEGER DEFAULT 0,
		worktree_id TEXT DEFAULT '',
		worktree_path TEXT DEFAULT '',
		worktree_branch TEXT DEFAULT '',
		last_seen_at TIMESTAMP,
		error_message TEXT DEFAULT '',
		metadata TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL
	);

	CREATE TABLE IF NOT EXISTS executor_profiles (
		id TEXT PRIMARY KEY,
		executor_id TEXT NOT NULL,
		name TEXT NOT NULL,
		mcp_policy TEXT DEFAULT '',
		config TEXT DEFAULT '{}',
		prepare_script TEXT DEFAULT '',
		cleanup_script TEXT DEFAULT '',
		env_vars TEXT DEFAULT '[]',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (executor_id) REFERENCES executors(id)
	);

	CREATE TABLE IF NOT EXISTS environments (
		id TEXT PRIMARY KEY,
		name TEXT NOT NULL,
		kind TEXT NOT NULL,
		is_system INTEGER NOT NULL DEFAULT 0,
		worktree_root TEXT DEFAULT '',
		image_tag TEXT DEFAULT '',
		dockerfile TEXT DEFAULT '',
		build_config TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		deleted_at TIMESTAMP
	);

	CREATE TABLE IF NOT EXISTS workflows (
		id TEXT PRIMARY KEY,
		workspace_id TEXT NOT NULL DEFAULT '',
		workflow_template_id TEXT DEFAULT '',
		name TEXT NOT NULL,
		description TEXT DEFAULT '',
		hidden INTEGER NOT NULL DEFAULT 0,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL
	);
`

func (r *Repository) initInfraSchema() error {
	_, err := r.db.Exec(infraSchemaDDL)
	return err
}

func (r *Repository) initTaskSchema() error {
	_, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS tasks (
		id TEXT PRIMARY KEY,
		workspace_id TEXT NOT NULL DEFAULT '',
		workflow_id TEXT NOT NULL DEFAULT '',
		workflow_step_id TEXT NOT NULL DEFAULT '',
		title TEXT NOT NULL,
		description TEXT DEFAULT '',
		state TEXT DEFAULT 'TODO',
		priority INTEGER DEFAULT 0,
		position INTEGER DEFAULT 0,
		metadata TEXT DEFAULT '{}',
		archived_at TIMESTAMP,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL
	);

	CREATE TABLE IF NOT EXISTS repositories (
		id TEXT PRIMARY KEY,
		workspace_id TEXT NOT NULL,
		name TEXT NOT NULL,
		source_type TEXT NOT NULL DEFAULT 'local',
		local_path TEXT DEFAULT '',
		provider TEXT DEFAULT '',
		provider_repo_id TEXT DEFAULT '',
		provider_owner TEXT DEFAULT '',
		provider_name TEXT DEFAULT '',
		default_branch TEXT DEFAULT '',
		worktree_branch_prefix TEXT DEFAULT 'feature/',
		pull_before_worktree INTEGER NOT NULL DEFAULT 1,
		setup_script TEXT DEFAULT '',
		cleanup_script TEXT DEFAULT '',
		dev_script TEXT DEFAULT '',
		copy_files TEXT DEFAULT '',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		deleted_at TIMESTAMP,
		FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE
	);

	CREATE TABLE IF NOT EXISTS task_repositories (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		repository_id TEXT NOT NULL,
		base_branch TEXT DEFAULT '',
		checkout_branch TEXT DEFAULT '',
		position INTEGER DEFAULT 0,
		metadata TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
		FOREIGN KEY (repository_id) REFERENCES repositories(id) ON DELETE CASCADE,
		UNIQUE(task_id, repository_id, base_branch, checkout_branch)
	);

	CREATE TABLE IF NOT EXISTS repository_scripts (
		id TEXT PRIMARY KEY,
		repository_id TEXT NOT NULL,
		name TEXT NOT NULL,
		command TEXT NOT NULL,
		position INTEGER DEFAULT 0,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (repository_id) REFERENCES repositories(id) ON DELETE CASCADE
	);
	`)
	return err
}

func (r *Repository) initCoreIndexes() error {
	_, err := r.db.Exec(`
	CREATE INDEX IF NOT EXISTS idx_tasks_workflow_id ON tasks(workflow_id);
	CREATE INDEX IF NOT EXISTS idx_tasks_workflow_step_id ON tasks(workflow_step_id);
	CREATE INDEX IF NOT EXISTS idx_tasks_archived_at ON tasks(archived_at);
	CREATE INDEX IF NOT EXISTS idx_task_repositories_task_id ON task_repositories(task_id);
	CREATE INDEX IF NOT EXISTS idx_task_repositories_repository_id ON task_repositories(repository_id);
	CREATE INDEX IF NOT EXISTS idx_repositories_workspace_id ON repositories(workspace_id);
	CREATE INDEX IF NOT EXISTS idx_repository_scripts_repo_id ON repository_scripts(repository_id);
	`)
	return err
}

func (r *Repository) initPlansSchema() error {
	if _, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS task_plans (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL UNIQUE,
		title TEXT NOT NULL DEFAULT 'Plan',
		content TEXT NOT NULL DEFAULT '',
		created_by TEXT NOT NULL DEFAULT 'agent',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE
	);
	CREATE INDEX IF NOT EXISTS idx_task_plans_task_id ON task_plans(task_id);
	`); err != nil {
		return err
	}
	if _, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS task_plan_revisions (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		revision_number INTEGER NOT NULL,
		title TEXT NOT NULL DEFAULT 'Plan',
		content TEXT NOT NULL DEFAULT '',
		author_kind TEXT NOT NULL DEFAULT 'agent',
		author_name TEXT NOT NULL DEFAULT '',
		revert_of_revision_id TEXT,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
		UNIQUE (task_id, revision_number)
	);
	CREATE INDEX IF NOT EXISTS idx_task_plan_revisions_task_created
		ON task_plan_revisions(task_id, created_at DESC);
	-- Hot-path index: GetLatestTaskPlanRevision (called on every plan write
	-- as part of the coalesce check), ListTaskPlanRevisions, and the
	-- MAX(revision_number) lookup in WritePlanRevision all order/scan by
	-- (task_id, revision_number DESC). With this index the latest-row lookup
	-- is O(1) instead of an O(N) scan + sort per task.
	CREATE INDEX IF NOT EXISTS idx_task_plan_revisions_task_number
		ON task_plan_revisions(task_id, revision_number DESC);
	`); err != nil {
		return err
	}
	return r.backfillInitialPlanRevisions()
}

// backfillInitialPlanRevisions ensures every existing task_plans row has at least
// one corresponding revision. Runs once at startup and is idempotent.
func (r *Repository) backfillInitialPlanRevisions() error {
	rows, err := r.db.Query(`
	SELECT p.id, p.task_id, p.title, p.content, p.created_by, p.created_at, p.updated_at
	FROM task_plans p
	WHERE NOT EXISTS (
		SELECT 1 FROM task_plan_revisions r WHERE r.task_id = p.task_id
	)`)
	if err != nil {
		return fmt.Errorf("query plans missing revisions: %w", err)
	}
	defer func() { _ = rows.Close() }()

	type row struct {
		id, taskID, title, content, createdBy string
		createdAt, updatedAt                  interface{}
	}
	var pending []row
	for rows.Next() {
		var x row
		if err := rows.Scan(&x.id, &x.taskID, &x.title, &x.content, &x.createdBy, &x.createdAt, &x.updatedAt); err != nil {
			return fmt.Errorf("scan plan for backfill: %w", err)
		}
		pending = append(pending, x)
	}
	if err := rows.Err(); err != nil {
		return fmt.Errorf("iterate plans for backfill: %w", err)
	}

	for _, x := range pending {
		authorKind := x.createdBy
		// Match CreateTaskPlan (plan.go) and the task_plan_revisions column DEFAULT 'agent'.
		if authorKind != "user" && authorKind != authorKindAgent {
			authorKind = authorKindAgent
		}
		_, err := r.db.Exec(r.db.Rebind(`
			INSERT INTO task_plan_revisions
			  (id, task_id, revision_number, title, content, author_kind, author_name, revert_of_revision_id, created_at, updated_at)
			VALUES (?, ?, 1, ?, ?, ?, 'legacy', NULL, ?, ?)
		`), uuid.New().String(), x.taskID, x.title, x.content, authorKind, x.createdAt, x.updatedAt)
		if err != nil {
			return fmt.Errorf("backfill revision for task %s: %w", x.taskID, err)
		}
	}
	return nil
}

// initDocumentsSchema creates the task_documents and task_document_revisions tables.
// These tables generalize task_plans: documents have a key (e.g., "plan", "spec") and type.
func (r *Repository) initDocumentsSchema() error {
	if _, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS task_documents (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		key TEXT NOT NULL DEFAULT 'plan',
		type TEXT NOT NULL DEFAULT 'plan',
		title TEXT NOT NULL DEFAULT 'Plan',
		content TEXT NOT NULL DEFAULT '',
		author_kind TEXT NOT NULL DEFAULT 'agent',
		author_name TEXT NOT NULL DEFAULT '',
		filename TEXT NOT NULL DEFAULT '',
		mime_type TEXT NOT NULL DEFAULT '',
		size_bytes INTEGER NOT NULL DEFAULT 0,
		disk_path TEXT NOT NULL DEFAULT '',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
		UNIQUE(task_id, key)
	);
	CREATE INDEX IF NOT EXISTS idx_task_documents_task_id ON task_documents(task_id);

	CREATE TABLE IF NOT EXISTS task_document_revisions (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		document_key TEXT NOT NULL DEFAULT 'plan',
		revision_number INTEGER NOT NULL,
		title TEXT NOT NULL DEFAULT 'Plan',
		content TEXT NOT NULL DEFAULT '',
		author_kind TEXT NOT NULL DEFAULT 'agent',
		author_name TEXT NOT NULL DEFAULT '',
		revert_of_revision_id TEXT,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
		UNIQUE (task_id, document_key, revision_number)
	);
	CREATE INDEX IF NOT EXISTS idx_task_document_revisions_task_key
		ON task_document_revisions(task_id, document_key, revision_number DESC);
	`); err != nil {
		return fmt.Errorf("init documents schema: %w", err)
	}
	return nil
}

func (r *Repository) initSessionSchema() error {
	if err := r.initSessionWorktreeSchema(); err != nil {
		return err
	}
	return r.initMessageTurnSchema()
}

func (r *Repository) initMessageTurnSchema() error {
	_, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS task_session_turns (
		id TEXT PRIMARY KEY,
		task_session_id TEXT NOT NULL,
		task_id TEXT NOT NULL,
		started_at TIMESTAMP NOT NULL,
		completed_at TIMESTAMP,
		metadata TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_session_id) REFERENCES task_sessions(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_turns_session_id ON task_session_turns(task_session_id);
	CREATE INDEX IF NOT EXISTS idx_turns_session_started ON task_session_turns(task_session_id, started_at);
	CREATE INDEX IF NOT EXISTS idx_turns_task_id ON task_session_turns(task_id);

	CREATE TABLE IF NOT EXISTS task_session_messages (
		id TEXT PRIMARY KEY,
		task_session_id TEXT NOT NULL,
		task_id TEXT DEFAULT '',
		turn_id TEXT NOT NULL,
		author_type TEXT NOT NULL DEFAULT 'user',
		author_id TEXT DEFAULT '',
		content TEXT NOT NULL,
		requests_input INTEGER DEFAULT 0,
		type TEXT NOT NULL DEFAULT 'message',
		metadata TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
		FOREIGN KEY (task_session_id) REFERENCES task_sessions(id) ON DELETE CASCADE,
		FOREIGN KEY (turn_id) REFERENCES task_session_turns(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_messages_session_id ON task_session_messages(task_session_id);
	CREATE INDEX IF NOT EXISTS idx_messages_created_at ON task_session_messages(created_at);
	CREATE INDEX IF NOT EXISTS idx_messages_session_created ON task_session_messages(task_session_id, created_at);
	CREATE INDEX IF NOT EXISTS idx_messages_turn_id ON task_session_messages(turn_id);
	-- idx_messages_session_updated is created in runMigrations() after the
	-- updated_at ADD COLUMN + backfill. Creating it here would fail on existing
	-- DBs where CREATE TABLE IF NOT EXISTS is a no-op and the column does not
	-- yet exist (schema init runs before migrations).
	`)
	return err
}

// sessionWorktreeSchemaDDL groups task_sessions, task_environments,
// task_environment_repos, and task_session_worktrees DDL so the owning
// function stays within the funlen limit.
const sessionWorktreeSchemaDDL = `
	CREATE TABLE IF NOT EXISTS task_sessions (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		agent_execution_id TEXT NOT NULL DEFAULT '',
		container_id TEXT NOT NULL DEFAULT '',
		agent_profile_id TEXT,
		executor_id TEXT DEFAULT '',
		executor_profile_id TEXT DEFAULT '',
		environment_id TEXT DEFAULT '',
		repository_id TEXT DEFAULT '',
		base_branch TEXT DEFAULT '',
		agent_profile_snapshot TEXT DEFAULT '{}',
		executor_snapshot TEXT DEFAULT '{}',
		environment_snapshot TEXT DEFAULT '{}',
		repository_snapshot TEXT DEFAULT '{}',
		state TEXT NOT NULL DEFAULT 'CREATED',
		error_message TEXT DEFAULT '',
		metadata TEXT DEFAULT '{}',
		started_at TIMESTAMP NOT NULL,
		completed_at TIMESTAMP,
		updated_at TIMESTAMP NOT NULL,
		is_primary INTEGER DEFAULT 0,
		is_passthrough INTEGER DEFAULT 0,
		review_status TEXT DEFAULT '',
		base_commit_sha TEXT DEFAULT '',
		task_environment_id TEXT DEFAULT '',
		cost_subcents INTEGER NOT NULL DEFAULT 0,
		tokens_in INTEGER NOT NULL DEFAULT 0,
		tokens_out INTEGER NOT NULL DEFAULT 0,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_task_sessions_task_id ON task_sessions(task_id);
	CREATE INDEX IF NOT EXISTS idx_task_sessions_state ON task_sessions(state);
	CREATE INDEX IF NOT EXISTS idx_task_sessions_task_state ON task_sessions(task_id, state);

	CREATE TABLE IF NOT EXISTS task_environments (
		id TEXT PRIMARY KEY,
		task_id TEXT NOT NULL,
		repository_id TEXT DEFAULT '',
		executor_type TEXT NOT NULL DEFAULT '',
		executor_id TEXT DEFAULT '',
		executor_profile_id TEXT DEFAULT '',
		agent_execution_id TEXT DEFAULT '',
		control_port INTEGER DEFAULT 0,
		status TEXT NOT NULL DEFAULT 'creating',
		worktree_id TEXT DEFAULT '',
		worktree_path TEXT DEFAULT '',
		worktree_branch TEXT DEFAULT '',
		workspace_path TEXT DEFAULT '',
		container_id TEXT DEFAULT '',
		sandbox_id TEXT DEFAULT '',
		task_dir_name TEXT DEFAULT '',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_task_environments_task_id ON task_environments(task_id);
	CREATE INDEX IF NOT EXISTS idx_task_environments_status ON task_environments(status);

	CREATE TABLE IF NOT EXISTS task_environment_repos (
		id TEXT PRIMARY KEY,
		task_environment_id TEXT NOT NULL,
		repository_id TEXT NOT NULL,
		branch_slug TEXT NOT NULL DEFAULT '',
		worktree_id TEXT DEFAULT '',
		worktree_path TEXT DEFAULT '',
		worktree_branch TEXT DEFAULT '',
		position INTEGER DEFAULT 0,
		error_message TEXT DEFAULT '',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (task_environment_id) REFERENCES task_environments(id) ON DELETE CASCADE,
		UNIQUE(task_environment_id, repository_id, branch_slug)
	);

	CREATE INDEX IF NOT EXISTS idx_task_environment_repos_env_id ON task_environment_repos(task_environment_id);
	CREATE INDEX IF NOT EXISTS idx_task_environment_repos_repository_id ON task_environment_repos(repository_id);

	CREATE TABLE IF NOT EXISTS task_session_worktrees (
		id TEXT PRIMARY KEY,
		session_id TEXT NOT NULL,
		worktree_id TEXT NOT NULL,
		repository_id TEXT NOT NULL,
		branch_slug TEXT NOT NULL DEFAULT '',
		position INTEGER DEFAULT 0,
		worktree_path TEXT DEFAULT '',
		worktree_branch TEXT DEFAULT '',
		status TEXT NOT NULL DEFAULT 'active',
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		merged_at TIMESTAMP,
		deleted_at TIMESTAMP,
		FOREIGN KEY (session_id) REFERENCES task_sessions(id) ON DELETE CASCADE,
		UNIQUE(session_id, worktree_id)
	);

	CREATE INDEX IF NOT EXISTS idx_task_session_worktrees_session_id ON task_session_worktrees(session_id);
	CREATE INDEX IF NOT EXISTS idx_task_session_worktrees_worktree_id ON task_session_worktrees(worktree_id);
	CREATE INDEX IF NOT EXISTS idx_task_session_worktrees_repository_id ON task_session_worktrees(repository_id);
	CREATE INDEX IF NOT EXISTS idx_task_session_worktrees_status ON task_session_worktrees(status);
`

func (r *Repository) initSessionWorktreeSchema() error {
	_, err := r.db.Exec(sessionWorktreeSchemaDDL)
	return err
}

func (r *Repository) initGitSchema() error {
	_, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS task_session_git_snapshots (
		id TEXT PRIMARY KEY,
		session_id TEXT NOT NULL,
		snapshot_type TEXT NOT NULL,
		branch TEXT NOT NULL,
		remote_branch TEXT DEFAULT '',
		head_commit TEXT DEFAULT '',
		base_commit TEXT DEFAULT '',
		ahead INTEGER DEFAULT 0,
		behind INTEGER DEFAULT 0,
		files TEXT DEFAULT '{}',
		triggered_by TEXT DEFAULT '',
		metadata TEXT DEFAULT '{}',
		created_at TIMESTAMP NOT NULL,
		FOREIGN KEY (session_id) REFERENCES task_sessions(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_git_snapshots_session ON task_session_git_snapshots(session_id, created_at DESC);
	CREATE INDEX IF NOT EXISTS idx_git_snapshots_type ON task_session_git_snapshots(session_id, snapshot_type);

	CREATE TABLE IF NOT EXISTS task_session_commits (
		id TEXT PRIMARY KEY,
		session_id TEXT NOT NULL,
		commit_sha TEXT NOT NULL,
		parent_sha TEXT DEFAULT '',
		author_name TEXT DEFAULT '',
		author_email TEXT DEFAULT '',
		commit_message TEXT DEFAULT '',
		committed_at TIMESTAMP NOT NULL,
		pre_commit_snapshot_id TEXT DEFAULT '',
		post_commit_snapshot_id TEXT DEFAULT '',
		files_changed INTEGER DEFAULT 0,
		insertions INTEGER DEFAULT 0,
		deletions INTEGER DEFAULT 0,
		created_at TIMESTAMP NOT NULL,
		FOREIGN KEY (session_id) REFERENCES task_sessions(id) ON DELETE CASCADE
	);

	CREATE INDEX IF NOT EXISTS idx_session_commits_session ON task_session_commits(session_id, committed_at DESC);
	CREATE INDEX IF NOT EXISTS idx_session_commits_sha ON task_session_commits(commit_sha);
	`)
	return err
}

func (r *Repository) initReviewSchema() error {
	_, err := r.db.Exec(`
	CREATE TABLE IF NOT EXISTS session_file_reviews (
		id TEXT PRIMARY KEY,
		session_id TEXT NOT NULL,
		file_path TEXT NOT NULL,
		reviewed INTEGER NOT NULL DEFAULT 0,
		diff_hash TEXT NOT NULL DEFAULT '',
		reviewed_at TIMESTAMP,
		created_at TIMESTAMP NOT NULL,
		updated_at TIMESTAMP NOT NULL,
		FOREIGN KEY (session_id) REFERENCES task_sessions(id) ON DELETE CASCADE,
		UNIQUE(session_id, file_path)
	);
	CREATE INDEX IF NOT EXISTS idx_session_file_reviews_session ON session_file_reviews(session_id);
	`)
	return err
}