package pluginsdk

import (
	"context"
	"testing"

	"github.com/stretchr/testify/require"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// dataRecordingHost is a fake Go-native Host implementation whose Host data
// API (ADR 0043) accessors are backed by in-memory fixtures, used to prove
// grpcHostServer -> grpcHostClient reachability for the read RPCs added in
// task-03. State/secrets/emit are inherited (unimplemented) from
// UnimplementedHostData since these tests only exercise the data accessors.
type dataRecordingHost struct {
	UnimplementedHostData

	tasks         map[string]Task
	taskList      []Task
	taskPageInfo  *PageInfo
	sessions      []Session
	sessionPage   *PageInfo
	codeStats     []SessionCodeStats
	codeStatsPage *PageInfo
	workspaces    []Workspace
	workflows     []Workflow
	workflowSteps []WorkflowStep
	agentProfiles []AgentProfile
	repositories  []Repository
	messages      []Message
	messagePage   *PageInfo
	utilityText   string

	lastTaskFilter    TaskFilter
	lastSessionFilter SessionFilter
	lastMessageFilter MessageFilter
	lastWorkspaceID   string
	lastWorkflowID    string
	lastUtilityPrompt string

	createdTask     Task
	lastCreateInput CreateTaskInput
	updatedTask     Task
	lastUpdateInput UpdateTaskInput
	messageDispatch MessageDispatch
	lastSendTask    string
	lastSendSession string
	lastSendText    string
}

func (h *dataRecordingHost) GetState(context.Context, string, string, string) (map[string]any, bool, error) {
	return nil, false, nil
}
func (h *dataRecordingHost) SetState(context.Context, string, string, string, map[string]any) error {
	return nil
}
func (h *dataRecordingHost) DeleteState(context.Context, string, string, string) error { return nil }
func (h *dataRecordingHost) ListState(context.Context, string, string) ([]StateEntry, error) {
	return nil, nil
}
func (h *dataRecordingHost) GetConfig(context.Context) (map[string]any, error) { return nil, nil }
func (h *dataRecordingHost) GetSecret(context.Context, string) (string, bool, error) {
	return "", false, nil
}
func (h *dataRecordingHost) SetSecret(context.Context, string, string) error      { return nil }
func (h *dataRecordingHost) DeleteSecret(context.Context, string) error           { return nil }
func (h *dataRecordingHost) RevealSecret(context.Context, string) (string, error) { return "", nil }
func (h *dataRecordingHost) EmitEvent(context.Context, string, map[string]any) error {
	return nil
}

func (h *dataRecordingHost) Tasks() TaskReader           { return dataRecordingTaskReader{h} }
func (h *dataRecordingHost) Sessions() SessionReader     { return dataRecordingSessionReader{h} }
func (h *dataRecordingHost) Workspaces() WorkspaceReader { return dataRecordingWorkspaceReader{h} }
func (h *dataRecordingHost) Workflows() WorkflowReader   { return dataRecordingWorkflowReader{h} }
func (h *dataRecordingHost) AgentProfiles() AgentProfileReader {
	return dataRecordingAgentProfileReader{h}
}
func (h *dataRecordingHost) Repositories() RepositoryReader {
	return dataRecordingRepositoryReader{h}
}
func (h *dataRecordingHost) Messages() MessageReader { return dataRecordingMessageReader{h} }
func (h *dataRecordingHost) InvokeUtilityAgent(_ context.Context, prompt string) (string, error) {
	h.lastUtilityPrompt = prompt
	return h.utilityText, nil
}

type dataRecordingTaskReader struct{ h *dataRecordingHost }

func (r dataRecordingTaskReader) List(_ context.Context, filter TaskFilter, _ Page) ([]Task, *PageInfo, error) {
	r.h.lastTaskFilter = filter
	return r.h.taskList, r.h.taskPageInfo, nil
}

func (r dataRecordingTaskReader) Get(_ context.Context, id string) (*Task, error) {
	task, ok := r.h.tasks[id]
	if !ok {
		return nil, status.Errorf(codes.NotFound, "task %q not found", id)
	}
	return &task, nil
}

func (r dataRecordingTaskReader) Create(_ context.Context, in CreateTaskInput) (*Task, error) {
	r.h.lastCreateInput = in
	task := r.h.createdTask
	return &task, nil
}

func (r dataRecordingTaskReader) Update(_ context.Context, in UpdateTaskInput) (*Task, error) {
	r.h.lastUpdateInput = in
	task := r.h.updatedTask
	return &task, nil
}

type dataRecordingSessionReader struct{ h *dataRecordingHost }

func (r dataRecordingSessionReader) List(_ context.Context, filter SessionFilter, _ Page) ([]Session, *PageInfo, error) {
	r.h.lastSessionFilter = filter
	return r.h.sessions, r.h.sessionPage, nil
}

func (r dataRecordingSessionReader) CodeStats(_ context.Context, filter SessionFilter, _ Page) ([]SessionCodeStats, *PageInfo, error) {
	r.h.lastSessionFilter = filter
	return r.h.codeStats, r.h.codeStatsPage, nil
}

type dataRecordingWorkspaceReader struct{ h *dataRecordingHost }

func (r dataRecordingWorkspaceReader) List(context.Context, Page) ([]Workspace, *PageInfo, error) {
	return r.h.workspaces, nil, nil
}

type dataRecordingWorkflowReader struct{ h *dataRecordingHost }

func (r dataRecordingWorkflowReader) List(_ context.Context, workspaceID string, _ Page) ([]Workflow, *PageInfo, error) {
	r.h.lastWorkspaceID = workspaceID
	return r.h.workflows, nil, nil
}

func (r dataRecordingWorkflowReader) ListSteps(_ context.Context, workflowID string) ([]WorkflowStep, error) {
	r.h.lastWorkflowID = workflowID
	return r.h.workflowSteps, nil
}

type dataRecordingAgentProfileReader struct{ h *dataRecordingHost }

func (r dataRecordingAgentProfileReader) List(context.Context, Page) ([]AgentProfile, *PageInfo, error) {
	return r.h.agentProfiles, nil, nil
}

type dataRecordingRepositoryReader struct{ h *dataRecordingHost }

func (r dataRecordingRepositoryReader) List(_ context.Context, workspaceID string, _ Page) ([]Repository, *PageInfo, error) {
	r.h.lastWorkspaceID = workspaceID
	return r.h.repositories, nil, nil
}

type dataRecordingMessageReader struct{ h *dataRecordingHost }

func (r dataRecordingMessageReader) List(_ context.Context, filter MessageFilter, _ Page) ([]Message, *PageInfo, error) {
	r.h.lastMessageFilter = filter
	return r.h.messages, r.h.messagePage, nil
}

func (r dataRecordingMessageReader) Send(_ context.Context, taskID, sessionID, text string) (*MessageDispatch, error) {
	r.h.lastSendTask = taskID
	r.h.lastSendSession = sessionID
	r.h.lastSendText = text
	dispatch := r.h.messageDispatch
	return &dispatch, nil
}

func TestHostData_TasksListAndGet(t *testing.T) {
	impl := &dataRecordingHost{
		tasks: map[string]Task{
			"task-1": {ID: "task-1", Title: "Fix the bug", State: "todo", Repositories: []TaskRepository{{
				ID: "tr-1", RepositoryID: "repo-1", BaseBranch: "main", Position: 0, CheckoutBranch: "feature/fix",
			}}},
		},
		taskList: []Task{{ID: "task-1", Title: "Fix the bug", State: "todo", Repositories: []TaskRepository{{
			ID: "tr-1", RepositoryID: "repo-1", BaseBranch: "main", Position: 0, CheckoutBranch: "feature/fix",
		}}}},
		taskPageInfo: &PageInfo{NextCursor: "next-1", HasMore: true},
	}
	host := dialHostOverBufconn(t, impl)

	tasks, pageInfo, err := host.Tasks().List(context.Background(), TaskFilter{States: []string{"todo"}}, Page{Limit: 10})
	require.NoError(t, err)
	require.Equal(t, []Task{{ID: "task-1", Title: "Fix the bug", State: "todo", Repositories: []TaskRepository{{
		ID: "tr-1", RepositoryID: "repo-1", BaseBranch: "main", Position: 0, CheckoutBranch: "feature/fix",
	}}}}, tasks)
	require.Equal(t, &PageInfo{NextCursor: "next-1", HasMore: true}, pageInfo)
	require.Equal(t, TaskFilter{States: []string{"todo"}}, impl.lastTaskFilter)

	task, err := host.Tasks().Get(context.Background(), "task-1")
	require.NoError(t, err)
	require.Equal(t, "Fix the bug", task.Title)
	require.Equal(t, "feature/fix", task.Repositories[0].CheckoutBranch)

	_, err = host.Tasks().Get(context.Background(), "missing")
	require.Error(t, err)
	require.Equal(t, codes.NotFound, status.Code(err))
}

// TestHostData_TaskWritesAndMessage proves the write RPCs (CreateTask,
// UpdateTask, SendMessage) round-trip inputs and results through
// grpcHostClient -> proto -> grpcHostServer, including the optional-pointer
// fields on the update mask.
func TestHostData_TaskWritesAndMessage(t *testing.T) {
	impl := &dataRecordingHost{
		createdTask:     Task{ID: "task-new", Title: "Investigate crash", State: "TODO"},
		updatedTask:     Task{ID: "task-1", Title: "Renamed", State: "IN_PROGRESS"},
		messageDispatch: MessageDispatch{SessionID: "session-1", Status: "queued"},
	}
	host := dialHostOverBufconn(t, impl)

	stepID := "step-2"
	created, err := host.Tasks().Create(context.Background(), CreateTaskInput{
		WorkspaceID: "ws-1", WorkflowID: "wf-1", WorkflowStepID: &stepID,
		Title: "Investigate crash", Description: "stack trace attached", StartAgent: true,
	})
	require.NoError(t, err)
	require.Equal(t, "task-new", created.ID)
	require.Equal(t, "ws-1", impl.lastCreateInput.WorkspaceID)
	require.NotNil(t, impl.lastCreateInput.WorkflowStepID)
	require.Equal(t, "step-2", *impl.lastCreateInput.WorkflowStepID)
	require.True(t, impl.lastCreateInput.StartAgent)

	title := "Renamed"
	state := "IN_PROGRESS"
	updated, err := host.Tasks().Update(context.Background(), UpdateTaskInput{ID: "task-1", Title: &title, State: &state})
	require.NoError(t, err)
	require.Equal(t, "IN_PROGRESS", updated.State)
	require.Equal(t, "task-1", impl.lastUpdateInput.ID)
	require.NotNil(t, impl.lastUpdateInput.Title)
	require.Equal(t, "Renamed", *impl.lastUpdateInput.Title)
	require.Nil(t, impl.lastUpdateInput.Description, "an unset field must stay nil across the wire")

	dispatch, err := host.Messages().Send(context.Background(), "task-1", "session-1", "rerun the tests")
	require.NoError(t, err)
	require.Equal(t, "session-1", dispatch.SessionID)
	require.Equal(t, "queued", dispatch.Status)
	require.Equal(t, "task-1", impl.lastSendTask)
	require.Equal(t, "session-1", impl.lastSendSession)
	require.Equal(t, "rerun the tests", impl.lastSendText)
}

func TestHostData_SessionsListAndCodeStats(t *testing.T) {
	impl := &dataRecordingHost{
		sessions:  []Session{{ID: "session-1", TaskID: "task-1", State: "running"}},
		codeStats: []SessionCodeStats{{SessionID: "session-1", LinesAddedCommitted: 10, CommittedLinesAvailable: true}},
	}
	host := dialHostOverBufconn(t, impl)

	sessions, _, err := host.Sessions().List(context.Background(), SessionFilter{TaskIDs: []string{"task-1"}}, Page{})
	require.NoError(t, err)
	require.Equal(t, impl.sessions, sessions)
	require.Equal(t, SessionFilter{TaskIDs: []string{"task-1"}}, impl.lastSessionFilter)

	stats, _, err := host.Sessions().CodeStats(context.Background(), SessionFilter{TaskIDs: []string{"task-1"}}, Page{})
	require.NoError(t, err)
	require.Equal(t, impl.codeStats, stats)
}

func TestHostData_Workspaces(t *testing.T) {
	impl := &dataRecordingHost{workspaces: []Workspace{{ID: "ws-1", Name: "Acme"}}}
	host := dialHostOverBufconn(t, impl)

	workspaces, _, err := host.Workspaces().List(context.Background(), Page{})
	require.NoError(t, err)
	require.Equal(t, impl.workspaces, workspaces)
}

func TestHostData_InvokeUtilityAgent(t *testing.T) {
	impl := &dataRecordingHost{utilityText: "the completion"}
	host := dialHostOverBufconn(t, impl)

	text, err := host.InvokeUtilityAgent(context.Background(), "do the thing")
	require.NoError(t, err)
	require.Equal(t, "the completion", text)
	require.Equal(t, "do the thing", impl.lastUtilityPrompt)
}

func TestHostData_Messages(t *testing.T) {
	impl := &dataRecordingHost{
		messages: []Message{{
			ID: "m1", SessionID: "s1", TaskID: "t1", TurnID: "turn1",
			AuthorType: "user", Content: "hello", Type: "message", CreatedAt: "2026-07-20T09:00:00Z",
		}},
		messagePage: &PageInfo{NextCursor: "2", HasMore: true},
	}
	host := dialHostOverBufconn(t, impl)

	since := "2026-07-20T00:00:00Z"
	filter := MessageFilter{SessionIDs: []string{"s1"}, TaskIDs: []string{"t1"}, Since: &since, Types: []string{"message"}}
	messages, pageInfo, err := host.Messages().List(context.Background(), filter, Page{Limit: 10})
	require.NoError(t, err)
	require.Equal(t, impl.messages, messages)
	require.Equal(t, &PageInfo{NextCursor: "2", HasMore: true}, pageInfo)
	// Filter (including the optional Since pointer) round-trips through proto.
	require.Equal(t, filter, impl.lastMessageFilter)
	require.NotNil(t, impl.lastMessageFilter.Since)
	require.Equal(t, since, *impl.lastMessageFilter.Since)
}

func TestHostData_WorkflowsAndSteps(t *testing.T) {
	impl := &dataRecordingHost{
		workflows:     []Workflow{{ID: "wf-1", WorkspaceID: "ws-1", Name: "Default"}},
		workflowSteps: []WorkflowStep{{ID: "step-1", WorkflowID: "wf-1", Name: "Review"}},
	}
	host := dialHostOverBufconn(t, impl)

	workflows, _, err := host.Workflows().List(context.Background(), "ws-1", Page{})
	require.NoError(t, err)
	require.Equal(t, impl.workflows, workflows)
	require.Equal(t, "ws-1", impl.lastWorkspaceID)

	steps, err := host.Workflows().ListSteps(context.Background(), "wf-1")
	require.NoError(t, err)
	require.Equal(t, impl.workflowSteps, steps)
	require.Equal(t, "wf-1", impl.lastWorkflowID)
}

func TestHostData_AgentProfiles(t *testing.T) {
	impl := &dataRecordingHost{agentProfiles: []AgentProfile{{ID: "profile-1", DisplayName: "Claude"}}}
	host := dialHostOverBufconn(t, impl)

	profiles, _, err := host.AgentProfiles().List(context.Background(), Page{})
	require.NoError(t, err)
	require.Equal(t, impl.agentProfiles, profiles)
}

func TestHostData_Repositories(t *testing.T) {
	impl := &dataRecordingHost{repositories: []Repository{{
		ID: "repo-1", WorkspaceID: "ws-1", Name: "team/kandev", SourceType: "provider", ProviderID: "example-vcs",
		ProviderRepositoryID: "repo-42", ProviderHost: "code.example.test", OwnerOrProject: "team", ProviderName: "kandev",
		RemoteURL: "https://code.example.test/scm/team/kandev.git",
	}}}
	host := dialHostOverBufconn(t, impl)

	repos, _, err := host.Repositories().List(context.Background(), "ws-1", Page{})
	require.NoError(t, err)
	require.Equal(t, impl.repositories, repos)
	require.Equal(t, "ws-1", impl.lastWorkspaceID)
}

// TestHostData_UnimplementedHostData_ReturnsUnimplemented proves that a Host
// implementation embedding UnimplementedHostData (task-03's default for
// task-04 to override) compiles against the Host interface and, over the
// wire, returns a gRPC Unimplemented status for every Host data API RPC —
// so a plugin author calling an unwired accessor gets a clear error rather
// than a panic or a zero-value success.
func TestHostData_UnimplementedHostData_ReturnsUnimplemented(t *testing.T) {
	impl := &recordingHost{}
	host := dialHostOverBufconn(t, impl)

	_, _, err := host.Tasks().List(context.Background(), TaskFilter{}, Page{})
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))

	_, err = host.Tasks().Get(context.Background(), "task-1")
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))

	_, _, err = host.Sessions().CodeStats(context.Background(), SessionFilter{}, Page{})
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))

	_, err = host.Tasks().Create(context.Background(), CreateTaskInput{Title: "x"})
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))

	_, err = host.Tasks().Update(context.Background(), UpdateTaskInput{ID: "task-1"})
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))

	_, err = host.Messages().Send(context.Background(), "task-1", "", "body")
	require.Error(t, err)
	require.Equal(t, codes.Unimplemented, status.Code(err))
}