package handlers

import (
	"bytes"
	"encoding/json"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"testing"

	imageModels "ginimageApi/app/images/models"
	"ginimageApi/configs"

	"github.com/gin-gonic/gin"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

func setupImageHandlersTestDB(t *testing.T) {
	t.Helper()
	prev := configs.DB
	dsn := "file:" + t.Name() + "?mode=memory&cache=shared"
	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
	if err != nil {
		t.Fatalf("sqlite open failed: %v", err)
	}
	if err := db.AutoMigrate(&imageModels.Image{}); err != nil {
		t.Fatalf("migrate failed: %v", err)
	}
	configs.DB = db
	t.Cleanup(func() {
		if sqlDB, err := db.DB(); err == nil {
			_ = sqlDB.Close()
		}
		configs.DB = prev
	})
}

func withUser(userID uint) gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Set("user_id", userID)
		c.Next()
	}
}

func TestProcessRequiresFile(t *testing.T) {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.POST("/images/process", Process)

	req := httptest.NewRequest(http.MethodPost, "/images/process", nil)
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestProcessRejectsInvalidWidth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.POST("/images/process", Process)

	var body bytes.Buffer
	writer := multipart.NewWriter(&body)
	filePart, err := writer.CreateFormFile("file", "dummy.jpg")
	if err != nil {
		t.Fatalf("failed to create form file: %v", err)
	}
	_, _ = filePart.Write([]byte("not-a-real-image"))
	_ = writer.WriteField("width", "abc")
	if err := writer.Close(); err != nil {
		t.Fatalf("failed to close writer: %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/images/process", &body)
	req.Header.Set("Content-Type", writer.FormDataContentType())
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestListImagesReturnsOnlyCurrentUser(t *testing.T) {
	gin.SetMode(gin.TestMode)
	setupImageHandlersTestDB(t)

	seed := []imageModels.Image{
		{UserID: 1, Filename: "a.avif", PublicPath: "/uploads/processed/a.avif", MimeType: "image/avif", Size: 10, Format: "avif", Quality: 90},
		{UserID: 1, Filename: "b.avif", PublicPath: "/uploads/processed/b.avif", MimeType: "image/avif", Size: 11, Format: "avif", Quality: 90},
		{UserID: 2, Filename: "c.avif", PublicPath: "/uploads/processed/c.avif", MimeType: "image/avif", Size: 12, Format: "avif", Quality: 90},
	}
	if err := configs.DB.Create(&seed).Error; err != nil {
		t.Fatalf("seed failed: %v", err)
	}

	r := gin.New()
	r.GET("/images", withUser(1), ListImages)

	req := httptest.NewRequest(http.MethodGet, "/images", nil)
	req.Host = "localhost:8080"
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d body=%s", w.Code, w.Body.String())
	}

	var resp struct {
		Count int `json:"count"`
		Items []struct {
			ID uint `json:"id"`
		} `json:"items"`
	}
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("json parse failed: %v", err)
	}
	if resp.Count != 2 || len(resp.Items) != 2 {
		t.Fatalf("expected 2 images for current user, got count=%d len=%d", resp.Count, len(resp.Items))
	}
}

func TestGetImageRejectsOtherUsersImage(t *testing.T) {
	gin.SetMode(gin.TestMode)
	setupImageHandlersTestDB(t)

	img := imageModels.Image{UserID: 2, Filename: "x.avif", PublicPath: "/uploads/processed/x.avif", MimeType: "image/avif", Size: 5, Format: "avif", Quality: 90}
	if err := configs.DB.Create(&img).Error; err != nil {
		t.Fatalf("seed failed: %v", err)
	}

	r := gin.New()
	r.GET("/images/:id", withUser(1), GetImage)

	w := httptest.NewRecorder()
	r.ServeHTTP(w, httptest.NewRequest(http.MethodGet, "/images/1", nil))

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d", w.Code)
	}
}