package v1

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"

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

type PushSubscriptionHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *PushSubscriptionHandler
	router  *gin.Engine
	user    *model.User
}

func (s *PushSubscriptionHandlerTestSuite) SetupSuite() {
	s.db, _ = gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	s.db.AutoMigrate(&model.PushToken{}, &model.User{}, &model.Account{})

	repo := repository.NewPushTokenRepo(s.db)
	svc := service.NewPushSubscriptionService(repo)
	s.handler = NewPushSubscriptionHandler(svc)

	gin.SetMode(gin.TestMode)
	r := gin.New()

	// Middleware to inject user_id into context (PushSubscription uses getUserID, not getAccountID)
	r.Use(func(c *gin.Context) {
		c.Set("user_id", uint(1))
		c.Next()
	})

	pushGroup := r.Group("/api/v1/push_subscriptions")
	pushGroup.GET("", s.handler.List)
	pushGroup.POST("", s.handler.Create)
	pushGroup.DELETE("/:id", s.handler.Delete)

	s.router = r

	// Create test user
	s.user = &model.User{Name: "TestUser", Email: "test@test.com"}
	s.db.Create(s.user)
}

func (s *PushSubscriptionHandlerTestSuite) TearDownSuite() {
	s.db.Exec("DELETE FROM push_tokens")
	s.db.Exec("DELETE FROM users")
}

func (s *PushSubscriptionHandlerTestSuite) SetupTest() {
	s.db.Exec("DELETE FROM push_tokens")
}

func TestPushSubscriptionHandlerTestSuite(t *testing.T) {
	suite.Run(t, new(PushSubscriptionHandlerTestSuite))
}

// --- List tests ---

func (s *PushSubscriptionHandlerTestSuite) TestList_Success() {
	s.db.Create(&model.PushToken{UserID: s.user.ID, Token: "token1", Platform: "web"})
	s.db.Create(&model.PushToken{UserID: s.user.ID, Token: "token2", Platform: "ios"})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/api/v1/push_subscriptions", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	s.NotNil(resp["data"])
}

func (s *PushSubscriptionHandlerTestSuite) TestList_Empty() {
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/api/v1/push_subscriptions", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	data := resp["data"].(map[string]interface{})
	subs := data["push_subscriptions"].([]interface{})
	s.Len(subs, 0)
}

// --- Create tests ---

func (s *PushSubscriptionHandlerTestSuite) TestCreate_Success() {
	body := `{"token":"newtoken","platform":"web","device_id":"device1"}`
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/push_subscriptions", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusCreated, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	data := resp["data"].(map[string]interface{})
	s.Equal("newtoken", data["token"])
	s.Equal("web", data["platform"])
}

func (s *PushSubscriptionHandlerTestSuite) TestCreate_MissingToken() {
	body := `{"platform":"web"}`
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/push_subscriptions", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	// ShouldBindJSON: missing token → empty string → binding:"required" triggers error
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *PushSubscriptionHandlerTestSuite) TestCreate_InvalidJSON() {
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/push_subscriptions", bytes.NewBufferString(`{invalid`))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *PushSubscriptionHandlerTestSuite) TestCreate_WithWebPushKeys() {
	body := `{"token":"webpush-token","platform":"web","p256dh":"key123","auth":"secret456"}`
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/api/v1/push_subscriptions", bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusCreated, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	data := resp["data"].(map[string]interface{})
	s.Equal("webpush-token", data["token"])
}

// --- Delete tests ---

func (s *PushSubscriptionHandlerTestSuite) TestDelete_Success() {
	pt := &model.PushToken{UserID: s.user.ID, Token: "deletetoken", Platform: "web"}
	s.db.Create(pt)

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodDelete, "/api/v1/push_subscriptions/"+fmt.Sprintf("%d", pt.ID), nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNoContent, w.Code)
}

func (s *PushSubscriptionHandlerTestSuite) TestDelete_InvalidID() {
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodDelete, "/api/v1/push_subscriptions/abc", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *PushSubscriptionHandlerTestSuite) TestDelete_NonExistent() {
	// GORM Delete on non-existent → nil → NoContent(204)
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodDelete, "/api/v1/push_subscriptions/99999", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNoContent, w.Code)
}