package main

import (
	"context"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"codex-telegram-bot/internal/store"
)

func main() {
	if err := run(context.Background(), os.Args[1:]); err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
}

func run(ctx context.Context, args []string) error {
	if len(args) == 0 {
		return usage()
	}
	dbPath := os.Getenv("DB_PATH")
	if dbPath == "" {
		dbPath = filepath.Join("data", "bot.db")
	}
	st, err := store.Open(ctx, dbPath)
	if err != nil {
		return err
	}
	defer st.Close()

	switch args[0] {
	case "allow-user":
		return allowUser(ctx, st, args[1:])
	case "remove-user":
		return removeUser(ctx, st, args[1:])
	case "list-users":
		return listUsers(ctx, st)
	case "add-workspace":
		return addWorkspace(ctx, st, args[1:])
	case "list-workspaces":
		return listWorkspaces(ctx, st)
	default:
		return usage()
	}
}

func usage() error {
	return errors.New(`usage:
  admin allow-user TELEGRAM_USER_ID [username] [notes...]
  admin remove-user TELEGRAM_USER_ID
  admin list-users
  admin add-workspace ABSOLUTE_PATH [label] [--default]
  admin list-workspaces`)
}

func allowUser(ctx context.Context, st *store.Store, args []string) error {
	if len(args) < 1 {
		return errors.New("allow-user requires TELEGRAM_USER_ID")
	}
	userID, err := strconv.ParseInt(args[0], 10, 64)
	if err != nil {
		return fmt.Errorf("invalid telegram user id: %w", err)
	}
	username := ""
	notes := ""
	if len(args) >= 2 {
		username = args[1]
	}
	if len(args) >= 3 {
		notes = strings.Join(args[2:], " ")
	}
	if err := st.AddAllowedUser(ctx, userID, username, notes); err != nil {
		return err
	}
	fmt.Printf("allowed user %d\n", userID)
	return nil
}

func removeUser(ctx context.Context, st *store.Store, args []string) error {
	if len(args) != 1 {
		return errors.New("remove-user requires TELEGRAM_USER_ID")
	}
	userID, err := strconv.ParseInt(args[0], 10, 64)
	if err != nil {
		return fmt.Errorf("invalid telegram user id: %w", err)
	}
	if err := st.RemoveAllowedUser(ctx, userID); err != nil {
		return err
	}
	fmt.Printf("removed user %d\n", userID)
	return nil
}

func listUsers(ctx context.Context, st *store.Store) error {
	users, err := st.ListAllowedUsers(ctx)
	if err != nil {
		return err
	}
	if len(users) == 0 {
		fmt.Println("no allowed users")
		return nil
	}
	for _, user := range users {
		if user.Username == "" && user.Notes == "" {
			fmt.Printf("%d\n", user.TelegramUserID)
			continue
		}
		fmt.Printf("%d\t%s\t%s\n", user.TelegramUserID, user.Username, user.Notes)
	}
	return nil
}

func addWorkspace(ctx context.Context, st *store.Store, args []string) error {
	if len(args) < 1 {
		return errors.New("add-workspace requires ABSOLUTE_PATH")
	}
	path := args[0]
	label := ""
	isDefault := false
	for _, arg := range args[1:] {
		if arg == "--default" {
			isDefault = true
			continue
		}
		if label == "" {
			label = arg
			continue
		}
		label += " " + arg
	}
	clean, err := store.ValidateWorkspacePath(path)
	if err != nil {
		return err
	}
	info, err := os.Stat(clean)
	if err != nil {
		return fmt.Errorf("workspace path is not accessible: %w", err)
	}
	if !info.IsDir() {
		return errors.New("workspace path must be a directory")
	}
	workspace, err := st.AddWorkspace(ctx, clean, label, isDefault)
	if err != nil {
		return err
	}
	fmt.Printf("workspace %d\t%s\t%s\n", workspace.ID, workspace.Label, workspace.Path)
	return nil
}

func listWorkspaces(ctx context.Context, st *store.Store) error {
	workspaces, err := st.ListWorkspaces(ctx)
	if err != nil {
		return err
	}
	if len(workspaces) == 0 {
		fmt.Println("no workspaces")
		return nil
	}
	for _, workspace := range workspaces {
		marker := ""
		if workspace.IsDefault {
			marker = "default"
		}
		fmt.Printf("%d\t%s\t%s\t%s\n", workspace.ID, marker, workspace.Label, workspace.Path)
	}
	return nil
}