package service

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/gochat/gochat/internal/repository"
)

// ========== Test Setup ==========

func setupFolderService(t *testing.T) (*FolderService, func()) {
	t.Helper()
	db := setupServiceTestDB(t)
	repo := repository.NewFolderRepo(db)
	svc := NewFolderService(repo)
	return svc, func() {}
}

// Helper: create a full chain of account -> portal for folder tests
func setupFolderTestChain(t *testing.T) (*FolderService, uint, uint) {
	t.Helper()
	db := setupServiceTestDB(t)
	repo := repository.NewFolderRepo(db)
	svc := NewFolderService(repo)

	account := createTestAccount(t, db)
	portal := createTestPortal(t, db, account.ID)

	return svc, portal.ID, account.ID
}

// ========== Create ==========

func TestFolderService_Create(t *testing.T) {
	svc, portalID, _ := setupFolderTestChain(t)

	req := &CreateFolderRequest{
		Name: "Documentation",
	}

	folder, err := svc.Create(context.Background(), portalID, req)
	require.NoError(t, err)
	assert.NotZero(t, folder.ID)
	assert.Equal(t, portalID, folder.PortalID)
	assert.Equal(t, "Documentation", folder.Name)
}

// ========== GetByID ==========

func TestFolderService_GetByID(t *testing.T) {
	svc, portalID, _ := setupFolderTestChain(t)

	req := &CreateFolderRequest{
		Name: "API Docs",
	}
	created, err := svc.Create(context.Background(), portalID, req)
	require.NoError(t, err)

	folder, err := svc.GetByID(context.Background(), created.ID)
	require.NoError(t, err)
	assert.Equal(t, created.ID, folder.ID)
	assert.Equal(t, "API Docs", folder.Name)
	assert.Equal(t, portalID, folder.PortalID)
}

func TestFolderService_GetByID_NotFound(t *testing.T) {
	svc, _, _ := setupFolderTestChain(t)

	folder, err := svc.GetByID(context.Background(), 99999)
	assert.Nil(t, folder)
	assert.Error(t, err)
}

// ========== Update ==========

func TestFolderService_Update(t *testing.T) {
	svc, portalID, _ := setupFolderTestChain(t)

	req := &CreateFolderRequest{
		Name: "Old Name",
	}
	created, err := svc.Create(context.Background(), portalID, req)
	require.NoError(t, err)

	updateReq := &UpdateFolderRequest{
		Name: "New Name",
	}
	updated, err := svc.Update(context.Background(), created.ID, updateReq)
	require.NoError(t, err)
	assert.Equal(t, "New Name", updated.Name)
	assert.Equal(t, created.ID, updated.ID)
}

func TestFolderService_Update_NotFound(t *testing.T) {
	svc, _, _ := setupFolderTestChain(t)

	updateReq := &UpdateFolderRequest{
		Name: "Does Not Matter",
	}
	updated, err := svc.Update(context.Background(), 99999, updateReq)
	assert.Nil(t, updated)
	assert.Error(t, err)
}

// ========== Delete ==========

func TestFolderService_Delete(t *testing.T) {
	svc, portalID, _ := setupFolderTestChain(t)

	req := &CreateFolderRequest{
		Name: "To Be Deleted",
	}
	created, err := svc.Create(context.Background(), portalID, req)
	require.NoError(t, err)

	err = svc.Delete(context.Background(), created.ID)
	require.NoError(t, err)

	// Verify it's actually gone
	folder, err := svc.GetByID(context.Background(), created.ID)
	assert.Nil(t, folder)
	assert.Error(t, err)
}

func TestFolderService_Delete_NotFound(t *testing.T) {
	svc, _, _ := setupFolderTestChain(t)

	// Delete checks existence first, so deleting a non-existent folder should error
	err := svc.Delete(context.Background(), 99999)
	assert.Error(t, err)
}

// ========== ListByPortalID ==========

func TestFolderService_ListByPortalID(t *testing.T) {
	svc, portalID, _ := setupFolderTestChain(t)

	// Create multiple folders
	names := []string{"Folder A", "Folder B", "Folder C"}
	for _, name := range names {
		req := &CreateFolderRequest{Name: name}
		_, err := svc.Create(context.Background(), portalID, req)
		require.NoError(t, err)
	}

	// List all (offset=0, limit=10)
	folders, count, err := svc.ListByPortalID(context.Background(), portalID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(3), count)
	assert.Len(t, folders, 3)

	// List with pagination (offset=1, limit=2)
	folders2, count2, err := svc.ListByPortalID(context.Background(), portalID, 1, 2)
	require.NoError(t, err)
	assert.Equal(t, int64(3), count2)
	assert.Len(t, folders2, 2)

	// List for a portal with no folders (use a different portal ID)
	folders3, count3, err := svc.ListByPortalID(context.Background(), 88888, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(0), count3)
	assert.Len(t, folders3, 0)
}