package main

import (
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"
	"os"

	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/auth"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/channel"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/config"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/db"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/gateway"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/giphy"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/message"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/middleware"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/server"
	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/upload"
	"github.com/go-chi/chi/v5"
	chimw "github.com/go-chi/chi/v5/middleware"
)

func main() {
	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

	cfg := config.Load()

	database, err := db.New(cfg)
	if err != nil {
		logger.Error("failed to connect to database", "error", err)
		os.Exit(1)
	}
	defer database.Close()

	if err := database.RunMigrations(); err != nil {
		logger.Error("failed to run migrations", "error", err)
		os.Exit(1)
	}

	// Session store for middleware
	sessionStore := auth.NewSessionStore(database.DB, cfg)

	// WebSocket hub
	hub := gateway.NewHub(logger)
	go hub.Run()

	// Giphy client (nil if no API key)
	giphyClient := giphy.NewClient(cfg.Giphy.APIKey)

	// Upload handler (nil if no MinIO config)
	uploadHandler, err := upload.NewHandler(cfg)
	if err != nil {
		logger.Warn("upload handler not available", "error", err)
	}

	// Auth handler
	authHandler := auth.NewHandler(database.DB, cfg)

	r := chi.NewRouter()
	r.Use(chimw.Logger)
	r.Use(chimw.Recoverer)
	r.Use(chimw.RequestID)

	// Health check
	r.Get("/health", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("ok"))
	})

	// WebSocket endpoint
	r.Get("/ws", func(w http.ResponseWriter, r *http.Request) {
		gateway.ServeWS(database.DB, hub, logger, w, r)
	})

	// API routes
	r.Route("/api/v1", func(r chi.Router) {
		// Auth (public: register, login, logout)
		r.Route("/auth", func(r chi.Router) {
			authHandler.RegisterPublicRoutes(r)
		})

		// Protected routes
		r.Group(func(r chi.Router) {
			r.Use(middleware.Session(sessionStore, cfg))
			r.Use(middleware.RequireAuth)

			// Auth (protected: me, update profile)
			authHandler.RegisterProtectedRoutes(r)

			// Servers
			r.Route("/servers", func(r chi.Router) {
				server.NewHandler(database.DB).RegisterRoutes(r)

				// Channels (nested under servers)
				r.Route("/{serverID}/channels", func(r chi.Router) {
					channel.NewHandler(database.DB).RegisterRoutes(r)
				})
			})

			// Messages (under channels)
			r.Route("/channels/{channelID}/messages", func(r chi.Router) {
				message.NewHandler(database.DB, hub).RegisterRoutes(r)
			})

			// Giphy search
			if giphyClient != nil {
				r.Get("/gifs/search", func(w http.ResponseWriter, r *http.Request) {
					query := r.URL.Query().Get("q")
					if query == "" {
						http.Error(w, `{"error":"missing query"}`, http.StatusBadRequest)
						return
					}
					gifs, err := giphyClient.Search(query, 20)
					if err != nil {
						http.Error(w, `{"error":"search failed"}`, http.StatusInternalServerError)
						return
					}
					w.Header().Set("Content-Type", "application/json")
					json.NewEncoder(w).Encode(gifs)
				})
				r.Get("/gifs/trending", func(w http.ResponseWriter, r *http.Request) {
					gifs, err := giphyClient.GetTrending(20)
					if err != nil {
						http.Error(w, `{"error":"trending failed"}`, http.StatusInternalServerError)
						return
					}
					w.Header().Set("Content-Type", "application/json")
					json.NewEncoder(w).Encode(gifs)
				})
			}

			// File upload
			if uploadHandler != nil {
				r.Post("/upload", uploadHandler.Upload)
			}
		})
	})

	// File serving (public, for viewing uploaded files)
	if uploadHandler != nil {
		r.Get("/files/*", uploadHandler.Serve)
	}

	// Static file serving for production (SPA)
	staticDir := "/srv/web"
	if _, err := os.Stat(staticDir); err == nil {
		fileServer := http.FileServer(http.Dir(staticDir))
		r.NotFound(func(w http.ResponseWriter, r *http.Request) {
			// If the file exists, serve it; otherwise serve index.html (SPA fallback)
			path := staticDir + r.URL.Path
			if _, err := os.Stat(path); os.IsNotExist(err) {
				http.ServeFile(w, r, staticDir+"/index.html")
				return
			}
			fileServer.ServeHTTP(w, r)
		})
	}

	addr := fmt.Sprintf(":%s", cfg.Port)
	logger.Info("starting server", "addr", addr)
	if err := http.ListenAndServe(addr, r); err != nil {
		logger.Error("server error", "error", err)
		os.Exit(1)
	}
}