package middleware

import (
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

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

	"github.com/gochat/gochat/internal/auth"
	"github.com/gochat/gochat/internal/config"
	"github.com/gochat/gochat/internal/model"
)

func makeJWTConfig() *config.JWTConfig {
	return &config.JWTConfig{
		Secret:              "test-secret-key-for-middleware-test",
		ExpiryHours:         24,
		RefreshExpiryHours:  48,
		AccessExpiryMinutes: 30,
		Audience:            "gochat-test",
		Issuer:              "gochat-test",
	}
}

func makeValidAccessToken(cfg *config.JWTConfig) string {
	svc := auth.NewJWTService(cfg)
	user := &model.User{Base: model.Base{ID: 1}, Provider: "email", Email: "test@test.com"}
	pair, _ := svc.GenerateTokenPair(user, 2, "agent")
	return pair.AccessToken
}

func TestAuthMiddleware_NoAuthHeader(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		c.JSON(200, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	r.ServeHTTP(w, req)
	assert.Equal(t, 401, w.Code)
}

func TestAuthMiddleware_BearerTokenRequired(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		c.JSON(200, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("Authorization", "Basic abc123")
	r.ServeHTTP(w, req)
	assert.Equal(t, 401, w.Code)
}

func TestAuthMiddleware_InvalidToken(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		c.JSON(200, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("Authorization", "Bearer invalid-token-string")
	r.ServeHTTP(w, req)
	assert.Equal(t, 401, w.Code)
}

func TestAuthMiddleware_ValidToken(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		userID, _ := c.Get("user_id")
		accountID, _ := c.Get("account_id")
		c.JSON(200, gin.H{"user_id": userID, "account_id": accountID})
	})

	token := makeValidAccessToken(cfg)
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
	r.ServeHTTP(w, req)
	assert.Equal(t, 200, w.Code)
}

func TestAuthMiddleware_ChatwootAccessTokenHeader(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		userID, _ := c.Get("user_id")
		accountID, _ := c.Get("account_id")
		c.JSON(200, gin.H{"user_id": userID, "account_id": accountID})
	})

	token := makeValidAccessToken(cfg)
	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("access-token", token)
	r.ServeHTTP(w, req)

	assert.Equal(t, 200, w.Code)
}

func TestAuthMiddleware_RejectsRevokedChatwootSession(t *testing.T) {
	ginsvc := gin.New()
	cfg := makeJWTConfig()
	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=private"), &gorm.Config{})
	assert.NoError(t, err)
	assert.NoError(t, db.AutoMigrate(&model.User{}, &model.UserSession{}))
	jwtService := auth.NewJWTService(cfg)
	user := &model.User{Base: model.Base{ID: 1}, Provider: "email", Email: "session@example.com"}
	assert.NoError(t, db.Create(user).Error)
	pair, err := jwtService.GenerateTokenPairForClient(user, 2, "agent", "client-1")
	assert.NoError(t, err)
	ginsvc.Use(AuthMiddlewareWithServiceAndDB(jwtService, db))
	ginsvc.GET("/test", func(c *gin.Context) { c.Status(http.StatusOK) })

	request := func() int {
		w := httptest.NewRecorder()
		req := httptest.NewRequest(http.MethodGet, "/test", nil)
		req.Header.Set("access-token", pair.AccessToken)
		ginsvc.ServeHTTP(w, req)
		return w.Code
	}
	assert.Equal(t, http.StatusUnauthorized, request())
	assert.NoError(t, db.Create(&model.UserSession{UserID: user.ID, ClientID: "client-1"}).Error)
	assert.Equal(t, http.StatusOK, request())
	assert.NoError(t, db.Where("user_id = ? AND client_id = ?", user.ID, "client-1").Delete(&model.UserSession{}).Error)
	assert.Equal(t, http.StatusUnauthorized, request())
}

func TestAuthMiddleware_AllowsPlatformAdminThroughSuperAdminGuard(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	jwtService := auth.NewJWTService(cfg)
	user := &model.User{
		Base:     model.Base{ID: 1},
		Provider: "email",
		Role:     "super_admin",
		Type:     "User",
	}
	pair, err := jwtService.GenerateTokenPair(user, 2, "administrator")
	assert.NoError(t, err)

	r := gin.New()
	r.Use(AuthMiddleware(cfg), SuperAdmin())
	r.GET("/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("access-token", pair.AccessToken)
	r.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
}

func TestAuthMiddleware_FallbackHeaders(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		userID, _ := c.Get("user_id")
		accountID, _ := c.Get("account_id")
		c.JSON(200, gin.H{"user_id": userID, "account_id": accountID})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("X-User-ID", "5")
	req.Header.Set("X-Account-ID", "10")
	r.ServeHTTP(w, req)
	assert.Equal(t, 200, w.Code)
}

func TestAuthMiddleware_FallbackInvalidUserID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		c.JSON(200, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("X-User-ID", "abc")
	req.Header.Set("X-Account-ID", "10")
	r.ServeHTTP(w, req)
	assert.Equal(t, 401, w.Code)
}

func TestAuthMiddleware_FallbackMissingUserID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	cfg := makeJWTConfig()
	r := gin.New()
	r.Use(AuthMiddleware(cfg))
	r.GET("/test", func(c *gin.Context) {
		c.JSON(200, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.Header.Set("X-Account-ID", "10")
	r.ServeHTTP(w, req)
	assert.Equal(t, 401, w.Code)
}

func TestGenerateToken(t *testing.T) {
	cfg := makeJWTConfig()
	tokenString, err := GenerateToken(cfg, 1, 2, "agent")
	assert.NoError(t, err)
	assert.NotEmpty(t, tokenString)
}