package api

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

	"git.pengzhan.dev/haopengzhan/rsspipe/internal/auth"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
)

func NewRouter(h *Handler, authService *auth.AuthService, staticDir string) http.Handler {
	r := chi.NewRouter()

	r.Use(middleware.RequestID)
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)
	r.Use(middleware.Compress(5))

	// CORS configuration for local development & PWA
	r.Use(cors.Handler(cors.Options{
		AllowedOrigins:   []string{"http://localhost:5173", "http://localhost:3000", "http://localhost:8080", "*"},
		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		ExposedHeaders:   []string{"Link"},
		AllowCredentials: true,
		MaxAge:           300,
	}))

	// Public share route (/share/<uuid>.html)
	r.Get("/share/{uuid}", h.ViewSharedEntry)

	// API Routes
	r.Route("/api", func(r chi.Router) {
		// Public auth endpoints
		r.Post("/auth/login", h.Login)
		r.Post("/auth/logout", h.Logout)

		// Protected endpoints
		r.Group(func(r chi.Router) {
			r.Use(authService.Middleware)

			r.Get("/auth/me", h.GetMe)
			r.Put("/auth/password", h.UpdatePassword)
			r.Get("/stats", h.GetStats)

			// Categories
			r.Get("/categories", h.ListCategories)
			r.Post("/categories", h.CreateCategory)
			r.Delete("/categories/{id}", h.DeleteCategory)

			// Feeds
			r.Get("/feeds", h.ListFeeds)
			r.Post("/feeds", h.CreateFeed)
			r.Put("/feeds/{id}", h.UpdateFeed)
			r.Delete("/feeds/{id}", h.DeleteFeed)
			r.Post("/feeds/{id}/refresh", h.RefreshFeed)
			r.Post("/feeds/refresh-all", h.RefreshAllFeeds)

			// Entries
			r.Get("/entries", h.ListEntries)
			r.Get("/entries/{id}", h.GetEntry)
			r.Put("/entries/{id}/read", h.UpdateEntryRead)
			r.Put("/entries/{id}/star", h.UpdateEntryStar)
			r.Post("/entries/{id}/share", h.ToggleShareEntry)
			r.Post("/entries/{id}/ai-summary", h.GenerateAISummary)
			r.Post("/entries/mark-all-read", h.MarkAllRead)
			r.Post("/entries/{id}/scrape", h.ScrapeEntry)
			r.Get("/entries/{id}/variants", h.ListEntryVariants)
			r.Get("/entries/{id}/variants/{key}/stream", h.GetVariantBlobStream)

			// Rules
			r.Get("/rules", h.ListRules)
			r.Post("/rules", h.CreateRule)
			r.Put("/rules/{id}", h.UpdateRule)
			r.Delete("/rules/{id}", h.DeleteRule)
			r.Post("/rules/{id}/apply", h.ApplyRule)

			// AI Settings
			r.Get("/settings/ai", h.GetAISettings)
			r.Put("/settings/ai", h.UpdateAISettings)
			r.Post("/settings/ai/test", h.TestAIConnection)

			// Search History
			r.Get("/search/history", h.GetSearchHistory)
			r.Post("/search/history", h.RecordSearch)
			r.Delete("/search/history", h.DeleteSearchHistory)

			// OPML
			r.Post("/opml/import", h.ImportOPML)
			r.Get("/opml/export", h.ExportOPML)
		})
	})

	// Static Files / Single Page Application fallback
	if staticDir != "" {
		if _, err := os.Stat(staticDir); err == nil {
			fileServer := http.FileServer(http.Dir(staticDir))
			r.Get("/*", func(w http.ResponseWriter, req *http.Request) {
				path := filepath.Join(staticDir, req.URL.Path)
				if _, err := os.Stat(path); os.IsNotExist(err) && !strings.HasPrefix(req.URL.Path, "/api") && !strings.HasPrefix(req.URL.Path, "/share") {
					http.ServeFile(w, req, filepath.Join(staticDir, "index.html"))
					return
				}
				fileServer.ServeHTTP(w, req)
			})
		}
	}

	return r
}