package main

import (
	"flag"
	"fmt"
	"html/template"
	"os"
	"path/filepath"

	"github.com/davidbyttow/govips/v2/vips"
	"nebbet.no/internal/admin"
	"nebbet.no/internal/admin/auth"
	"nebbet.no/internal/db"
	"nebbet.no/internal/media"
	"nebbet.no/internal/server"
)

const (
	outputDir    = "public"
	dataDir      = "data"
	metaDBPath   = "data/meta.db"
	searchDBPath = "data/search.db"
	passwordFile = ".passwords"
)

func main() {
	if len(os.Args) < 2 {
		usage()
		os.Exit(1)
	}
	switch os.Args[1] {
	case "serve":
		cmdServe(os.Args[2:])
	case "user":
		cmdUser(os.Args[2:])
	default:
		fmt.Fprintf(os.Stderr, "unknown command %q\n", os.Args[1])
		usage()
		os.Exit(1)
	}
}

func cmdServe(args []string) {
	fs := flag.NewFlagSet("serve", flag.ExitOnError)
	port := fs.String("port", "8080", "port to listen on")
	_ = fs.Parse(args)

	if err := vips.Startup(nil); err != nil {
		fmt.Fprintln(os.Stderr, "govips startup:", err)
		os.Exit(1)
	}
	defer vips.Shutdown()

	meta, search := mustOpenDBs()
	defer meta.Close()
	defer search.Close()

	adminSrv := admin.NewServer(passwordFile, meta, search, outputDir)
	engine := adminSrv.Engine()

	tmpl, err := template.ParseGlob(filepath.Join("templates", "*.html"))
	if err != nil {
		fmt.Fprintln(os.Stderr, "template load error:", err)
		os.Exit(1)
	}

	libMIMEs := server.AllowedMIMEs{
		".js":   "application/javascript; charset=utf-8",
		".css":  "text/css; charset=utf-8",
		".wasm": "application/wasm",
	}
	publicMIMEs := server.AllowedMIMEs{
		".html": "text/html; charset=utf-8",
		".css":  "text/css; charset=utf-8",
		".js":   "application/javascript; charset=utf-8",
		".json": "application/json",
		".xml":  "application/xml",
		".txt":  "text/plain; charset=utf-8",
		".ico":  "image/x-icon",
		".svg":  "image/svg+xml",
		".png":  "image/png",
		".jpg":  "image/jpeg",
		".webp": "image/webp",
	}
	stylesMIMEs := server.AllowedMIMEs{
		".css": "text/css; charset=utf-8",
	}

	engine.GET("/assets/styles/*filepath", server.FileHandler("assets/styles", stylesMIMEs))
	engine.GET("/lib/*filepath", server.FileHandler("assets/lib", libMIMEs))
	engine.GET("/assets/components/*filepath", server.FileHandler("assets/components", libMIMEs))

	// Image upload (admin-protected) + public image serving with on-the-fly conversion
	mediaSrv := media.NewMediaHandler("assets/media")
	adminSrv.RegisterUploadRoute(mediaSrv.HandleUpload)
	engine.GET("/media/*filepath", mediaSrv.HandleServe)

	frontpage := server.NewFrontpageHandler(meta, search, tmpl)
	engine.GET("/", frontpage.Serve)

	postHandler := server.NewPostHandler(meta, tmpl, outputDir)
	engine.GET("/:slug", postHandler.Serve)

	engine.NoRoute(server.PublicFileHandler(outputDir, publicMIMEs))

	addr := ":" + *port
	fmt.Printf("listening on http://localhost%s\n", addr)
	fmt.Printf("  admin UI:    http://localhost%s/admin/\n", addr)
	if err := engine.Run(addr); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

// ── user ─────────────────────────────────────────────────────────────────────

func cmdUser(args []string) {
	if len(args) == 0 {
		fmt.Fprintln(os.Stderr, "usage: nebbet user <add|list|delete|passwd> [username]")
		os.Exit(1)
	}
	a := auth.New(passwordFile)
	switch args[0] {
	case "add":
		requireArg(args, 1, "nebbet user add <username>")
		if err := a.AddUser(args[1]); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Println("user added:", args[1])
	case "list":
		users, err := a.ListUsers()
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		if len(users) == 0 {
			fmt.Println("(no users)")
			return
		}
		for _, u := range users {
			fmt.Println(u)
		}
	case "delete":
		requireArg(args, 1, "nebbet user delete <username>")
		if err := a.DeleteUser(args[1]); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Println("user deleted:", args[1])
	case "passwd":
		requireArg(args, 1, "nebbet user passwd <username>")
		if err := a.ChangePassword(args[1]); err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		fmt.Println("password updated:", args[1])
	default:
		fmt.Fprintf(os.Stderr, "unknown user subcommand %q\n", args[0])
		os.Exit(1)
	}
}

func mustOpenDBs() (*db.MetaDB, *db.SearchDB) {
	if err := os.MkdirAll(dataDir, 0755); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
	meta, err := db.OpenMeta(metaDBPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "meta db:", err)
		os.Exit(1)
	}
	search, err := db.OpenSearch(searchDBPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, "search db:", err)
		os.Exit(1)
	}
	return meta, search
}

func requireArg(args []string, n int, usage string) {
	if len(args) <= n {
		fmt.Fprintln(os.Stderr, "usage:", usage)
		os.Exit(1)
	}
}

func usage() {
	fmt.Fprintln(os.Stderr, `nebbet.no

Commands:
  serve [--port N]        serve site + admin UI (default port 8080)
  user add <name>         add user to password file
  user list               list users
  user delete <name>      remove user
  user passwd <name>      change user password`)
}