package files

import (
	"bytes"
	"encoding/json"
	"fmt"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/glebarez/sqlite"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
	"senlinai-agent/backend/internal/config"
	"senlinai-agent/backend/internal/httpx"
	"senlinai-agent/backend/internal/models"
)

func TestFileRegistrarSavesBeforeCreatingIdentitySourceDTO(t *testing.T) {
	router, database, project, storageRoot := newFileHandlerTestRouter(t, 1, 1)
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)
	require.NoError(t, writer.WriteField("title", "客户资料"))
	part, err := writer.CreateFormFile("file", "客户资料.txt")
	require.NoError(t, err)
	_, err = part.Write([]byte("private content"))
	require.NoError(t, err)
	require.NoError(t, writer.Close())
	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/sources", body)
	req.Header.Set("Content-Type", writer.FormDataContentType())
	req.Header.Set("Authorization", "Bearer test-token")
	rec := httptest.NewRecorder()

	router.ServeHTTP(rec, req)

	require.Equal(t, http.StatusCreated, rec.Code, rec.Body.String())
	var source models.SenlinAgentSource
	require.NoError(t, database.Where("project_id = ?", project.ID).First(&source).Error)
	require.FileExists(t, filepath.Join(storageRoot, filepath.FromSlash(source.FilePath)))
	var payload map[string]any
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &payload))
	require.Equal(t, source.Identity, payload["id"])
	require.Equal(t, project.Identity, payload["projectId"])
	require.Equal(t, filepath.ToSlash(source.FilePath), payload["filePath"])
	require.NotContains(t, payload["filePath"], storageRoot)
	require.NotContains(t, payload, "AbsolutePath")
	require.NotContains(t, rec.Body.String(), storageRoot)
}

func TestFileRegistrarChecksOwnershipBeforeWritingFile(t *testing.T) {
	router, database, project, storageRoot := newFileHandlerTestRouter(t, 1, 2)
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)
	part, err := writer.CreateFormFile("file", "hidden.txt")
	require.NoError(t, err)
	_, err = part.Write([]byte("must not be stored"))
	require.NoError(t, err)
	require.NoError(t, writer.Close())
	req := httptest.NewRequest(http.MethodPost, "/api/v1/projects/"+project.Identity+"/sources", body)
	req.Header.Set("Content-Type", writer.FormDataContentType())
	req.Header.Set("Authorization", "Bearer test-token")
	rec := httptest.NewRecorder()

	router.ServeHTTP(rec, req)

	require.Equal(t, http.StatusNotFound, rec.Code, rec.Body.String())
	var count int64
	require.NoError(t, database.Model(&models.SenlinAgentSource{}).Count(&count).Error)
	require.Zero(t, count)
	entries, err := os.ReadDir(storageRoot)
	require.NoError(t, err)
	require.Empty(t, entries)
}

func newFileHandlerTestRouter(t *testing.T, currentUserID, ownerID uint) (*gin.Engine, *gorm.DB, models.SenlinAgentProject, string) {
	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
	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "owner@example.com", DisplayName: "Owner", PasswordHash: "hash"}).Error)
	require.NoError(t, database.Create(&models.SenlinAgentUser{Email: "other@example.com", DisplayName: "Other", PasswordHash: "hash"}).Error)
	project := models.SenlinAgentProject{OwnerID: ownerID, Name: "Files", Identifier: fmt.Sprintf("FILES-%d", ownerID)}
	require.NoError(t, database.Create(&project).Error)
	storageRoot := t.TempDir()
	router := httpx.NewProtectedRouter(
		config.Config{Env: "test"},
		func(string) (uint, error) { return currentUserID, nil },
		NewHandler(NewService(storageRoot, database)),
	)
	return router, database, project, storageRoot
}