package api

import (
	"net/http"
	"os"
	"strings"

	"github.com/go-chi/chi/v5"
	chimiddleware "github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
	"github.com/yourusername/markedit/internal/api/handlers"
	"github.com/yourusername/markedit/internal/api/middleware"
	"github.com/yourusername/markedit/internal/database"
)

// NewRouter creates and configures the HTTP router
func NewRouter(db *database.DB) http.Handler {
	r := chi.NewRouter()

	// Middleware
	r.Use(chimiddleware.RequestID)
	r.Use(chimiddleware.RealIP)
	r.Use(middleware.Logger)
	r.Use(chimiddleware.Recoverer)

	// CORS configuration
	allowedOrigins := os.Getenv("ALLOWED_ORIGINS")
	if allowedOrigins == "" {
		allowedOrigins = "http://localhost:4321"
	}

	r.Use(cors.Handler(cors.Options{
		AllowedOrigins:   strings.Split(allowedOrigins, ","),
		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		ExposedHeaders:   []string{"Link"},
		AllowCredentials: true,
		MaxAge:           300,
	}))

	// Create handlers
	authHandler := handlers.NewAuthHandler(db)
	repoHandler := handlers.NewRepoHandler(db)

	// Get cache directory from environment
	cacheDir := os.Getenv("GIT_CACHE_DIR")
	if cacheDir == "" {
		cacheDir = "./data/repos"
	}
	branchHandler := handlers.NewBranchHandler(db, cacheDir)

	// Public routes
	r.Get("/api/health", handlers.HealthCheck)
	r.Get("/api/auth/github/login", authHandler.BeginAuth)
	r.Get("/api/auth/github/callback", authHandler.CallbackAuth)

	// Protected routes
	r.Group(func(r chi.Router) {
		r.Use(middleware.RequireAuth(db))

		r.Get("/api/auth/user", authHandler.GetCurrentUser)
		r.Post("/api/auth/logout", authHandler.Logout)
		r.Get("/api/user/repos", authHandler.GetUserRepos)
		r.Post("/api/user/repo", authHandler.UpdateLastRepo)

		// Repository routes
		r.Get("/api/repos", repoHandler.ListRepositories)
		r.Get("/api/repos/{owner}/{repo}/files", repoHandler.ListFiles)
		r.Get("/api/repos/{owner}/{repo}/files/*", repoHandler.GetFileContent)
		r.Put("/api/repos/{owner}/{repo}/files/*", repoHandler.UpdateFileContent)
		r.Delete("/api/repos/{owner}/{repo}/cache", repoHandler.InvalidateCache)

		// File management routes
		r.Post("/api/repos/{owner}/{repo}/create-file", repoHandler.CreateFile)
		r.Post("/api/repos/{owner}/{repo}/create-folder", repoHandler.CreateFolder)
		r.Post("/api/repos/{owner}/{repo}/rename", repoHandler.RenameItem)
		r.Get("/api/repos/{owner}/{repo}/pending-changes", repoHandler.GetPendingChanges)
		r.Delete("/api/repos/{owner}/{repo}/pending-changes", repoHandler.DiscardChanges)

		// Branch routes
		r.Get("/api/repos/{owner}/{repo}/branch/status", branchHandler.GetBranchStatus)
		r.Post("/api/repos/{owner}/{repo}/publish", branchHandler.Publish)
	})

	return r
}