package server

import (
	"encoding/json"
	"net/http"

	"github.com/food-ai/backend/internal/auth"
	"github.com/food-ai/backend/internal/diary"
	"github.com/food-ai/backend/internal/ingredient"
	"github.com/food-ai/backend/internal/menu"
	"github.com/food-ai/backend/internal/middleware"
	"github.com/food-ai/backend/internal/product"
	"github.com/food-ai/backend/internal/recognition"
	"github.com/food-ai/backend/internal/recommendation"
	"github.com/food-ai/backend/internal/savedrecipe"
	"github.com/food-ai/backend/internal/user"
	"github.com/go-chi/chi/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

func NewRouter(
	pool *pgxpool.Pool,
	authHandler *auth.Handler,
	userHandler *user.Handler,
	recommendationHandler *recommendation.Handler,
	savedRecipeHandler *savedrecipe.Handler,
	ingredientHandler *ingredient.Handler,
	productHandler *product.Handler,
	recognitionHandler *recognition.Handler,
	menuHandler *menu.Handler,
	diaryHandler *diary.Handler,
	authMiddleware func(http.Handler) http.Handler,
	allowedOrigins []string,
) *chi.Mux {
	r := chi.NewRouter()

	// Global middleware
	r.Use(middleware.RequestID)
	r.Use(middleware.Logging)
	r.Use(middleware.Recovery)
	r.Use(middleware.CORS(allowedOrigins))

	// Public
	r.Get("/health", healthCheck(pool))
	r.Route("/auth", func(r chi.Router) {
		r.Post("/login", authHandler.Login)
		r.Post("/refresh", authHandler.Refresh)
		r.Post("/logout", authHandler.Logout)
	})

	// Protected
	r.Group(func(r chi.Router) {
		r.Use(authMiddleware)

		r.Get("/ingredients/search", ingredientHandler.Search)

		r.Get("/profile", userHandler.Get)
		r.Put("/profile", userHandler.Update)

		r.Get("/recommendations", recommendationHandler.GetRecommendations)

		r.Route("/saved-recipes", func(r chi.Router) {
			r.Post("/", savedRecipeHandler.Save)
			r.Get("/", savedRecipeHandler.List)
			r.Get("/{id}", savedRecipeHandler.GetByID)
			r.Delete("/{id}", savedRecipeHandler.Delete)
		})

		r.Route("/products", func(r chi.Router) {
			r.Get("/", productHandler.List)
			r.Post("/", productHandler.Create)
			r.Post("/batch", productHandler.BatchCreate)
			r.Put("/{id}", productHandler.Update)
			r.Delete("/{id}", productHandler.Delete)
		})

		r.Route("/menu", func(r chi.Router) {
			r.Get("/", menuHandler.GetMenu)
			r.Put("/items/{id}", menuHandler.UpdateMenuItem)
			r.Delete("/items/{id}", menuHandler.DeleteMenuItem)
		})

		r.Route("/shopping-list", func(r chi.Router) {
			r.Get("/", menuHandler.GetShoppingList)
			r.Post("/generate", menuHandler.GenerateShoppingList)
			r.Patch("/items/{index}/check", menuHandler.ToggleShoppingItem)
		})

		r.Route("/diary", func(r chi.Router) {
			r.Get("/", diaryHandler.GetByDate)
			r.Post("/", diaryHandler.Create)
			r.Delete("/{id}", diaryHandler.Delete)
		})

		r.Route("/ai", func(r chi.Router) {
			r.Post("/recognize-receipt", recognitionHandler.RecognizeReceipt)
			r.Post("/recognize-products", recognitionHandler.RecognizeProducts)
			r.Post("/recognize-dish", recognitionHandler.RecognizeDish)
			r.Post("/generate-menu", menuHandler.GenerateMenu)
		})
	})

	return r
}

func healthCheck(pool *pgxpool.Pool) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		dbStatus := "connected"
		if err := pool.Ping(r.Context()); err != nil {
			dbStatus = "disconnected"
		}

		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]string{
			"status":  "ok",
			"version": "0.1.0",
			"db":      dbStatus,
		})
	}
}