import { useCallback, useEffect, useState } from 'react';
import { invoke } from '@tauri-apps/api/core';
import { load } from '@tauri-apps/plugin-store';

import { GAME_DIR_KEY, SETTINGS_FILE, SETTINGS_FILE_OPTIONS } from '../lib/store';

/**
 * Owns the user's selected game directory. Hydrates from the persistent store
 * on mount, writes back on every change, and pushes the value to the Tauri
 * backend so it can scan/rescan.
 */
export const useGameDirectory = () => {
    const [gameDir, setGameDir] = useState('');
    const [gameDirExists, setGameDirExists] = useState(false);

    useEffect(() => {
        let cancelled = false;
        const hydrate = async () => {
            try {
                const store = await load(SETTINGS_FILE, SETTINGS_FILE_OPTIONS);
                const saved = await store.get<string>(GAME_DIR_KEY);
                if (saved && !cancelled) setGameDir(saved);
            } catch (err) {
                console.error('Failed to load game directory:', err);
            }
        };
        void hydrate();
        return () => {
            cancelled = true;
        };
    }, []);

    useEffect(() => {
        if (!gameDir.trim()) {
            setGameDirExists(false);
            return;
        }
        let cancelled = false;
        const sync = async () => {
            try {
                const store = await load(SETTINGS_FILE, SETTINGS_FILE_OPTIONS);
                await store.set(GAME_DIR_KEY, gameDir);
            } catch (err) {
                console.error('Failed to persist game directory:', err);
            }

            let exists = false;
            try {
                exists = await invoke<boolean>('game_directory_exists', { path: gameDir });
            } catch (err) {
                console.error('Failed to validate game directory:', err);
            }
            if (cancelled) return;
            setGameDirExists(exists);
            if (!exists) return;

            invoke('update_game_directory', { path: gameDir }).catch(err =>
                console.error('Failed to push game directory to backend:', err),
            );
        };
        void sync();
        return () => {
            cancelled = true;
        };
    }, [gameDir]);

    const rescan = useCallback(() => {
        if (!gameDir.trim()) {
            setGameDirExists(false);
            return;
        }
        const sync = async () => {
            let exists = false;
            try {
                exists = await invoke<boolean>('game_directory_exists', { path: gameDir });
            } catch (err) {
                console.error('Failed to validate game directory:', err);
            }
            setGameDirExists(exists);
            if (!exists) return;

            invoke('update_game_directory', { path: gameDir }).catch(err =>
                console.error('Failed to rescan game directory:', err),
            );
        };
        void sync();
    }, [gameDir]);

    return { gameDir, gameDirExists, setGameDir, rescan };
};