package main

import (
	"fmt"
	"net/http"
	"path/filepath"
	"hyperia/config"
	"hyperia/db"
	"hyperia/handlers"
	"hyperia/logger"
	"runtime/debug"
	"strings"

	"github.com/golang-jwt/jwt/v5"
	"github.com/rs/zerolog/log"
)

func main() {
	config.SetConfiguration()
	logger.ConfigureLogger()

	err := db.InitDB()
	if err != nil {
		log.Fatal().Msgf("failed to connect to database: %v", err)
	} else {
		log.Info().Msg("successfully connected to PostgreSQL")
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if r := recover(); r != nil {
				log.Error().
					Interface("panic_reason", r).
					Bytes("stack_trace", debug.Stack()).
					Msg("panic in http goroutine")
			}
		}()

		subdomain := ""
		host := strings.Split(r.Host, ":")[0] // remove port
		parts := strings.Split(host, ".")
		if len(parts) > 2 || (len(parts) > 1 && parts[1] == "localhost") {
			subdomain = parts[0]
		}

		if strings.HasPrefix(r.URL.Path, "/_") {
			handleAsset(w, r)
		} else if subdomain == "apply" {
			authMiddleware(handleApply)(w, r)
		} else if subdomain == "pma" {
			authMiddleware(handlePMA)(w, r)
		} else {
			handlePublic(w, r)
		}
	})

	log.Info().Msgf("Server starting on http://localhost: %s", config.PORT)
	err = http.ListenAndServe(":"+config.PORT, nil)
	if err != nil {
		log.Fatal().Msgf("failed to start server: %v", err)
	}

}

func handlePublic(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path == "/api/login" {
		handlers.HandleLogin(w, r)
		return
	}
	if r.URL.Path == "/api/join" {
		handlers.HandleJoin(w, r)
		return
	}
	if r.URL.Path == "/verify" {
		handlers.HandleVerify(w, r)
		return
	}

	servePublicFile(w, r)
}

func handleAsset(w http.ResponseWriter, r *http.Request) {
	path := r.URL.Path
	filePath := filepath.Join("../ui", path)
	log.Debug().Msgf("serving asset: %s", filePath)
	http.ServeFile(w, r, filePath)
}

func servePublicFile(w http.ResponseWriter, r *http.Request) {
	path := r.URL.Path

	if path == "/" {
		path = "/index.html"
	} else if !strings.Contains(path, ".") {
		path = filepath.Join("/pages", path) + ".html"
	}

	filePath := filepath.Join("../ui/public", path)
	log.Debug().Msgf("serving: %s", filePath)
	http.ServeFile(w, r, filePath)
}

func authMiddleware(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cookie, err := r.Cookie("auth_token")
		if err != nil {
			log.Warn().Msg("Unauthorized - missing auth token")
			http.Error(w, "Unauthorized - missing auth token", http.StatusUnauthorized)
			return
		}
		jwtToken := cookie.Value

		token, err := jwt.Parse(jwtToken, func(token *jwt.Token) (interface{}, error) {
			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
			}
			return []byte(config.JWT_SECRET), nil
		})

		if err != nil {
			log.Err(err).Msg("error authenticating jwt")
		}
		if err != nil || !token.Valid {
			http.Error(w, "Unauthorized - invalid auth token", http.StatusUnauthorized)
			return
		}

		next(w, r)
	}
}

func handleApply(w http.ResponseWriter, r *http.Request) {

	// if r.URL.Path == "/api/application-save" {
	// 	handlers.HandleApplicationSubmit(w, r)
	// 	return
	// }
	// if r.URL.Path == "/api/get-application" {
	// 	handlers.HandleGetApplication(w, r)
	// 	return
	// }
	// if r.URL.Path == "/logout" {
	// 	handlers.HandleLogout(w, r)
	// 	return
	// }
	// if r.URL.Path == "/" {
	// 	handlers.CheckApplicationCompleteMiddleware(w, r)
	// }
	// if r.URL.Path == "/complete" {
	// 	handlers.ApplicationSubmitMiddleware(w, r)
	// }

	path := r.URL.Path
	if path == "/" {
		path = "/index.html"
	} else if !strings.Contains(path, ".") {
		path = filepath.Join("/pages", path) + ".html"
	}

	filePath := filepath.Join("../ui/apply", path)
	log.Debug().Msgf("Serving apply subdomain: %s", filePath)
	http.ServeFile(w, r, filePath)
}

func handlePMA(w http.ResponseWriter, r *http.Request) {
	path := r.URL.Path
	if path == "/" {
		path = "/index.html"
	} else if !strings.Contains(path, ".") {
		path = filepath.Join("/pages", path) + ".html"
	}

	filePath := filepath.Join("../ui/pma", path)
	log.Debug().Msgf("serving pma subdomain: %s", filePath)
	http.ServeFile(w, r, filePath)
}