package projects

import (
	"errors"
	"fmt"
	"path/filepath"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/glebarez/sqlite"
	"github.com/jackc/pgx/v5/pgconn"
	"github.com/stretchr/testify/require"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
	"senlinai-agent/backend/internal/models"
)

func TestFindOwnedProjectScopesIdentityByOwner(t *testing.T) {
	newTestDB(t)
	service := NewService()
	owned, err := service.CreateProject(1, "Alpha", "")
	require.NoError(t, err)
	other, err := service.CreateProject(2, "Beta", "")
	require.NoError(t, err)

	found, err := FindOwnedProject(1, owned.Identity)

	require.NoError(t, err)
	require.Equal(t, owned.ID, found.ID)

	_, err = FindOwnedProject(1, other.Identity)
	require.True(t, errors.Is(err, gorm.ErrRecordNotFound))
}

func TestProjectIdentifierDatabaseConstraintIsScopedByOwner(t *testing.T) {
	database := newTestDB(t)
	first := models.SaProject{OwnerID: 1, Name: "Alpha", Identifier: "SHARED"}
	require.NoError(t, database.Create(&first).Error)

	duplicate := models.SaProject{OwnerID: 1, Name: "Duplicate", Identifier: "SHARED"}
	require.ErrorIs(t, database.Create(&duplicate).Error, gorm.ErrDuplicatedKey)

	otherOwner := models.SaProject{OwnerID: 2, Name: "Allowed", Identifier: "SHARED"}
	require.NoError(t, database.Create(&otherOwner).Error)
}

func TestProjectIdentifierDatabaseErrorMapsToConflict(t *testing.T) {
	database := newTestDB(t)
	first := models.SaProject{OwnerID: 1, Name: "Alpha", Identifier: "SHARED"}
	require.NoError(t, database.Create(&first).Error)
	duplicate := models.SaProject{OwnerID: 1, Name: "Duplicate", Identifier: "SHARED"}
	databaseErr := database.Create(&duplicate).Error
	require.ErrorIs(t, databaseErr, gorm.ErrDuplicatedKey)

	require.ErrorIs(t, projectWriteError(databaseErr), ErrProjectIdentifierConflict)
}

func TestPostgresDuplicateKeyErrorMapsToProjectConflict(t *testing.T) {
	databaseErr := postgres.Dialector{}.Translate(&pgconn.PgError{Code: "23505"})
	require.ErrorIs(t, databaseErr, gorm.ErrDuplicatedKey)
	require.ErrorIs(t, projectWriteError(databaseErr), ErrProjectIdentifierConflict)
}

func TestProjectTagsAreScopedToProject(t *testing.T) {
	newTestDB(t)
	service := NewService()
	first, err := service.CreateProject(1, "Alpha", "")
	require.NoError(t, err)
	second, err := service.CreateProject(1, "Beta", "")
	require.NoError(t, err)

	_, err = service.CreateTag(first.ID, "重要")
	require.NoError(t, err)
	_, err = service.CreateTag(second.ID, "重要")
	require.NoError(t, err)

	firstTags, err := service.ListTags(first.ID)
	require.NoError(t, err)
	require.Len(t, firstTags, 1)
	require.Equal(t, first.ID, firstTags[0].ProjectID)
}

func TestCreateProjectPersistsWorkspaceMetadata(t *testing.T) {
	newTestDB(t)
	service := NewService()

	project, err := service.CreateProjectWithInput(1, CreateProjectRequest{
		Name:        "探索项目",
		Identifier:  "EXP",
		Icon:        "compass",
		Background:  "#165DFF",
		Description: "RSS 采集和线索沉淀",
	})

	require.NoError(t, err)
	require.Equal(t, "探索项目", project.Name)
	require.Equal(t, "EXP", project.Identifier)
	require.Equal(t, "compass", project.Icon)
	require.Equal(t, "#165DFF", project.Background)
	require.Equal(t, "RSS 采集和线索沉淀", project.Description)

	workspace, err := service.Workspace(1, project.Identity)
	require.NoError(t, err)
	require.Equal(t, "EXP", workspace.Project.Identifier)
	require.Equal(t, "compass", workspace.Project.Icon)
	require.Equal(t, "#165DFF", workspace.Project.Background)
	require.Equal(t, "RSS 采集和线索沉淀", workspace.Project.Description)
}

func TestWorkspaceMatchesFrontendContract(t *testing.T) {
	database := newTestDB(t)
	service := NewService()
	require.NoError(t, database.Create(&models.SaUser{Email: "david@example.com", DisplayName: "David", PasswordHash: "hash"}).Error)
	project, err := service.CreateProject(1, "Project A1", "Client strategy workspace")
	require.NoError(t, err)
	other, err := service.CreateProject(1, "Project A2", "")
	require.NoError(t, err)
	nextRun := time.Date(2026, 7, 20, 9, 0, 0, 0, time.UTC)

	require.NoError(t, database.Create(&models.SaTag{ProjectID: project.ID, Name: "UI"}).Error)
	require.NoError(t, database.Create(&models.SaTag{ProjectID: project.ID, Name: "knowledge"}).Error)
	require.NoError(t, database.Create(&models.SaInboxItem{ProjectID: project.ID, CreatedBy: 1, SourceType: "Manual", Title: "Collect notes", Body: "Turn pasted research into tasks.", Status: "open"}).Error)
	require.NoError(t, database.Create(&models.SaInboxItem{ProjectID: other.ID, CreatedBy: 1, SourceType: "Manual", Title: "Other notes", Body: "Hidden", Status: "open"}).Error)
	require.NoError(t, database.Create(&models.SaTask{ProjectID: project.ID, CreatedBy: 1, Title: "Confirm IA", Description: "Review channel layout.", Status: "open", DueAt: &nextRun}).Error)
	require.NoError(t, database.Create(&models.SaTask{ProjectID: project.ID, CreatedBy: 1, Title: "Archive notes", Description: "Move outdated notes.", Status: "done"}).Error)
	require.NoError(t, database.Create(&models.SaAISession{ProjectID: project.ID, CreatedBy: 1, Title: "UI prototype critique", Context: "Discuss channel behavior."}).Error)
	require.NoError(t, database.Create(&models.SaNote{ProjectID: project.ID, CreatedBy: 1, Title: "Workbench principles", Markdown: "# Notes"}).Error)
	require.NoError(t, database.Create(&models.SaSource{ProjectID: project.ID, CreatedBy: 1, Kind: "link", Title: "Reference board", URL: "https://example.com"}).Error)
	require.NoError(t, database.Create(&models.SaProjectChannel{ProjectID: project.ID, Title: "Roadmap Board", Icon: "link", URL: "https://example.com/roadmap-a1", SortOrder: 7}).Error)
	require.NoError(t, database.Create(&models.SaProjectChannel{ProjectID: other.ID, Title: "Other Board", Icon: "link", URL: "https://example.com/other", SortOrder: 7}).Error)
	require.NoError(t, database.Create(&models.SaCronPlan{ProjectID: project.ID, CreatedBy: 1, Title: "Weekly inbox review reminder", Schedule: "0 9 * * 1", NextRunAt: &nextRun, Enabled: true, LastResult: "Not run yet"}).Error)
	require.NoError(t, database.Create(&models.SaCronPlan{ProjectID: other.ID, CreatedBy: 1, Title: "Other cron", Schedule: "0 9 * * 2", Enabled: true}).Error)

	workspace, err := service.Workspace(1, project.Identity)

	require.NoError(t, err)
	require.Equal(t, project.Identity, workspace.Project.ID)
	require.Equal(t, "Project A1", workspace.Project.Name)
	require.Equal(t, "A1", workspace.Project.Initials)
	require.Equal(t, int64(1), workspace.Project.UnreadCount)
	require.Equal(t, []string{"UI", "knowledge"}, workspaceTagNames(workspace.Tags))
	require.Len(t, workspace.Channels, 7)
	require.Equal(t, "overview", workspace.Channels[0].Type)
	require.Equal(t, "inbox", workspace.Channels[1].Type)
	require.Equal(t, int64(1), workspace.Channels[1].Count)
	require.Equal(t, "custom_link", workspace.Channels[6].Type)
	require.Equal(t, "Roadmap Board", workspace.Channels[6].Title)
	require.Equal(t, "https://example.com/roadmap-a1", workspace.Channels[6].URL)
	require.Len(t, workspace.Inbox, 1)
	require.Equal(t, "Manual", workspace.Inbox[0].Source)
	require.Equal(t, "Turn pasted research into tasks.", workspace.Inbox[0].Summary)
	require.Len(t, workspace.Tasks, 2)
	require.False(t, workspace.Tasks[0].Completed)
	require.Equal(t, "David", workspace.Tasks[0].Owner)
	require.NotEmpty(t, workspace.Tasks[0].CreatedAt)
	require.Len(t, workspace.AISessions, 1)
	require.Len(t, workspace.RecentSessions, 1)
	require.Len(t, workspace.NotesSources, 2)
	require.Equal(t, "note", workspace.NotesSources[0].Kind)
	require.Equal(t, "link", workspace.NotesSources[1].Kind)
	require.Len(t, workspace.CronPlans, 1)
	require.True(t, workspace.CronPlans[0].Enabled)
	require.Equal(t, "David", workspace.CronPlans[0].Owner)
}

func TestWorkspaceRejectsProjectOwnedByAnotherUser(t *testing.T) {
	newTestDB(t)
	service := NewService()
	project, err := service.CreateProject(2, "Beta", "")
	require.NoError(t, err)

	_, err = service.Workspace(1, project.Identity)

	require.Error(t, err)
}

func TestCreateProjectTagAddsTagToOwnedProject(t *testing.T) {
	newTestDB(t)
	service := NewService()
	project, err := service.CreateProject(1, "Alpha", "")
	require.NoError(t, err)

	tag, err := service.CreateProjectTag(1, project.ID, "Design")

	require.NoError(t, err)
	require.Equal(t, project.ID, tag.ProjectID)
	require.Equal(t, "Design", tag.Name)
	workspace, err := service.Workspace(1, project.Identity)
	require.NoError(t, err)
	require.Equal(t, []string{"Design"}, workspaceTagNames(workspace.Tags))
}

func TestCreateProjectTagRejectsProjectOwnedByAnotherUser(t *testing.T) {
	newTestDB(t)
	service := NewService()
	project, err := service.CreateProject(2, "Beta", "")
	require.NoError(t, err)

	_, err = service.CreateProjectTag(1, project.ID, "Hidden")

	require.Error(t, err)
}

func TestCreateProjectTagConcurrentlyReturnsOneProjectScopedTag(t *testing.T) {
	databasePath := filepath.ToSlash(filepath.Join(t.TempDir(), "tags.db"))
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?_pragma=busy_timeout(10000)&_pragma=journal_mode(WAL)", databasePath)), &gorm.Config{TranslateError: true, Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	sqlDB, err := database.DB()
	require.NoError(t, err)
	t.Cleanup(func() { require.NoError(t, sqlDB.Close()) })
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	service := NewService()
	project, err := service.CreateProjectWithInput(1, CreateProjectRequest{Name: "Concurrent", Identifier: "CONCURRENT"})
	require.NoError(t, err)

	arrived := make(chan struct{}, 2)
	release := make(chan struct{})
	var synchronizedQueries atomic.Int32
	require.NoError(t, database.Callback().Create().Before("gorm:create").Register("test:synchronize_tag_inserts", func(tx *gorm.DB) {
		if tx.Statement.Schema == nil || tx.Statement.Schema.Table != (models.SaTag{}).TableName() {
			return
		}
		if synchronizedQueries.Add(1) <= 2 {
			arrived <- struct{}{}
			<-release
		}
	}))

	type result struct {
		tag *models.SaTag
		err error
	}
	results := make(chan result, 2)
	var workers sync.WaitGroup
	workers.Add(2)
	for range 2 {
		go func() {
			defer workers.Done()
			tag, err := service.CreateProjectTag(1, project.ID, "UI")
			results <- result{tag: tag, err: err}
		}()
	}
	<-arrived
	<-arrived
	close(release)
	workers.Wait()
	close(results)

	identities := map[string]struct{}{}
	for value := range results {
		require.NoError(t, value.err)
		require.NotNil(t, value.tag)
		identities[value.tag.Identity] = struct{}{}
	}
	require.Len(t, identities, 1)
	var count int64
	require.NoError(t, database.Model(&models.SaTag{}).Where("project_id = ? AND name = ?", project.ID, "UI").Count(&count).Error)
	require.Equal(t, int64(1), count)
}

func TestCreateCronPlanAddsPlanToOwnedProject(t *testing.T) {
	database := newTestDB(t)
	service := NewService()
	require.NoError(t, database.Create(&models.SaUser{Email: "david@example.com", DisplayName: "David", PasswordHash: "hash"}).Error)
	project, err := service.CreateProject(1, "Alpha", "")
	require.NoError(t, err)
	nextRun := time.Date(2026, 7, 22, 8, 0, 0, 0, time.UTC)

	plan, err := service.CreateCronPlan(1, project.ID, CreateCronPlanInput{
		Title:     "Daily inbox sweep",
		Schedule:  "0 9 * * *",
		Enabled:   true,
		NextRunAt: &nextRun,
	})

	require.NoError(t, err)
	require.Equal(t, project.ID, plan.ProjectID)
	require.Equal(t, uint(1), plan.CreatedBy)
	require.Equal(t, "Daily inbox sweep", plan.Title)
	require.Equal(t, "0 9 * * *", plan.Schedule)
	require.True(t, plan.Enabled)
	require.NotNil(t, plan.NextRunAt)
	require.Empty(t, plan.LastResult, "创建计划只保存元数据，不能伪造执行结果")
	workspace, err := service.Workspace(1, project.Identity)
	require.NoError(t, err)
	require.Len(t, workspace.CronPlans, 1)
	require.Equal(t, "Daily inbox sweep", workspace.CronPlans[0].Title)
}

func newTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{TranslateError: true})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	return database
}

func workspaceTagNames(tags []WorkspaceTagDTO) []string {
	names := make([]string, 0, len(tags))
	for _, tag := range tags {
		names = append(names, tag.Name)
	}
	return names
}