package main

import (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"wedding-server/internal/store"
)

// runCLI handles admin subcommands (listing/removing bad RSVPs or photo
// uploads) so fixing a mistake doesn't require touching the database by hand.
// Returns the process exit code.
func runCLI(dataDir string, st *store.Store, args []string) int {
	if len(args) == 0 {
		printCLIUsage()
		return 1
	}

	switch args[0] {
	case "rsvp":
		return runRSVPCLI(st, args[1:])
	case "photos":
		return runPhotosCLI(dataDir, st, args[1:])
	case "help", "-h", "--help":
		printCLIUsage()
		return 0
	default:
		fmt.Fprintf(os.Stderr, "unknown command %q\n\n", args[0])
		printCLIUsage()
		return 1
	}
}

func printCLIUsage() {
	fmt.Println(`Usage:
  wedding-server                     start the web server
  wedding-server rsvp list           list all RSVPs
  wedding-server rsvp delete <id>    delete an RSVP and its guests
  wedding-server photos list         list all photo uploads
  wedding-server photos delete <id>  delete a photo upload and its files`)
}

func runRSVPCLI(st *store.Store, args []string) int {
	if len(args) == 0 {
		printCLIUsage()
		return 1
	}

	switch args[0] {
	case "list":
		rsvps, err := st.ListRSVPs()
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			return 1
		}
		if len(rsvps) == 0 {
			fmt.Println("no RSVPs yet")
			return 0
		}
		for _, r := range rsvps {
			names := make([]string, len(r.Guests))
			for i, g := range r.Guests {
				names[i] = g.Name
				if g.IsChild {
					names[i] += " (child)"
				}
			}
			fmt.Printf("#%d  %s  %s\n", r.ID, r.CreatedAt.Local().Format("2006-01-02 15:04"), strings.Join(names, ", "))
			if r.Message != "" {
				fmt.Printf("     message: %s\n", r.Message)
			}
		}
		return 0

	case "delete":
		if len(args) < 2 {
			fmt.Fprintln(os.Stderr, "usage: wedding-server rsvp delete <id>")
			return 1
		}
		id, err := strconv.ParseInt(args[1], 10, 64)
		if err != nil {
			fmt.Fprintf(os.Stderr, "invalid id %q\n", args[1])
			return 1
		}
		if !confirm(fmt.Sprintf("Delete RSVP #%d? This cannot be undone.", id)) {
			fmt.Println("cancelled")
			return 0
		}
		if err := st.DeleteRSVP(id); err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			return 1
		}
		fmt.Printf("deleted RSVP #%d\n", id)
		return 0

	default:
		printCLIUsage()
		return 1
	}
}

func runPhotosCLI(dataDir string, st *store.Store, args []string) int {
	if len(args) == 0 {
		printCLIUsage()
		return 1
	}

	switch args[0] {
	case "list":
		uploads, err := st.ListPhotoUploads()
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			return 1
		}
		if len(uploads) == 0 {
			fmt.Println("no photo uploads yet")
			return 0
		}
		for _, u := range uploads {
			fmt.Printf("#%d  %s  %s  (%d photo(s))\n", u.ID, u.CreatedAt.Local().Format("2006-01-02 15:04"), u.Name, len(u.Files))
			for _, f := range u.Files {
				fmt.Printf("     %s\n", f.URL)
			}
		}
		return 0

	case "delete":
		if len(args) < 2 {
			fmt.Fprintln(os.Stderr, "usage: wedding-server photos delete <id>")
			return 1
		}
		id, err := strconv.ParseInt(args[1], 10, 64)
		if err != nil {
			fmt.Fprintf(os.Stderr, "invalid id %q\n", args[1])
			return 1
		}
		if !confirm(fmt.Sprintf("Delete photo upload #%d and its files? This cannot be undone.", id)) {
			fmt.Println("cancelled")
			return 0
		}
		files, err := st.DeletePhotoUpload(id)
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			return 1
		}
		for _, f := range files {
			if err := os.Remove(f.Path); err != nil && !os.IsNotExist(err) {
				fmt.Fprintf(os.Stderr, "warning: could not remove %s: %v\n", f.Path, err)
			}
		}
		// Best-effort: only removes the per-upload directory if now empty.
		_ = os.Remove(filepath.Join(dataDir, "photos", strconv.FormatInt(id, 10)))
		fmt.Printf("deleted photo upload #%d (%d file(s))\n", id, len(files))
		return 0

	default:
		printCLIUsage()
		return 1
	}
}

func confirm(prompt string) bool {
	fmt.Printf("%s [y/N]: ", prompt)
	line, _ := bufio.NewReader(os.Stdin).ReadString('\n')
	line = strings.ToLower(strings.TrimSpace(line))
	return line == "y" || line == "yes"
}