import { createLogger } from '../../shared/logger.js';

const logger = createLogger('profile');
const DEFAULT_AVATAR = '/images/p1.png';
const MAX_AVATAR_SIZE = 2 * 1024 * 1024;
const USER_ID_PREFIX = 'user_';
const USER_ID_LENGTH = 8;
const USER_ID_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

function getElement(id) {
    return document.getElementById(id);
}

function setAvatarPreview(avatarUrl) {
    const userAvatar = getElement('userAvatar');
    const avatarPreview = getElement('avatarPreview');

    if (userAvatar) {
        userAvatar.src = avatarUrl;
    }
    if (avatarPreview) {
        avatarPreview.src = avatarUrl;
    }
}

function updateUserName(name) {
    const userName = getElement('userName');
    if (userName) {
        userName.textContent = name;
    }
}

function generateUserId() {
    let result = USER_ID_PREFIX;
    for (let i = 0; i < USER_ID_LENGTH; i++) {
        result += USER_ID_CHARS.charAt(Math.floor(Math.random() * USER_ID_CHARS.length));
    }
    return result;
}

function readStoredSettings() {
    const rawSettings = localStorage.getItem('userSettings');
    if (!rawSettings) {
        return null;
    }

    return JSON.parse(rawSettings);
}

function getCurrentSettingsPayload() {
    const nicknameInput = getElement('nicknameInput');
    const userIdInput = getElement('userIdInput');
    const avatarPreview = getElement('avatarPreview');

    return {
        userId: userIdInput ? userIdInput.value : generateUserId(),
        name: nicknameInput ? (nicknameInput.value || '\u6211') : '\u6211',
        avatar: avatarPreview ? (avatarPreview.src || DEFAULT_AVATAR) : DEFAULT_AVATAR
    };
}

async function uploadAvatar(formData) {
    const response = await fetch('/api/upload/avatar', {
        method: 'POST',
        body: formData
    });

    if (!response.ok) {
        throw new Error('\u4e0a\u4f20\u5931\u8d25');
    }

    return response.json();
}

export function createProfileSettingsController({ store, notify }) {
    let documentEventsBound = false;

    function loadUserSettings() {
        try {
            const settings = readStoredSettings();
            if (!settings) {
                const nextUserId = generateUserId();
                const userIdInput = getElement('userIdInput');
                if (userIdInput) {
                    userIdInput.value = nextUserId;
                }

                setAvatarPreview(DEFAULT_AVATAR);
                saveSettings();
                return;
            }

            const userIdInput = getElement('userIdInput');
            const nicknameInput = getElement('nicknameInput');

            if (settings.userId && userIdInput) {
                userIdInput.value = settings.userId;
            }
            if (settings.name && nicknameInput) {
                nicknameInput.value = settings.name;
            }

            updateUserName(settings.name || '\u6211');
            setAvatarPreview(settings.avatar || DEFAULT_AVATAR);
        } catch (error) {
            logger.error('Error loading user settings:', error);
            setAvatarPreview(DEFAULT_AVATAR);
        }
    }

    function saveSettings() {
        const settings = getCurrentSettingsPayload();

        localStorage.setItem('userSettings', JSON.stringify(settings));
        store.syncSocketUserInfo(settings);
        updateUserName(settings.name);
        setAvatarPreview(settings.avatar);

        notify('\u8bbe\u7f6e\u5df2\u4fdd\u5b58', 'success');
    }

    async function handleAvatarUpload(event) {
        const file = event.target.files[0];
        if (!file) {
            return;
        }

        if (!file.type.startsWith('image/')) {
            notify('\u8bf7\u9009\u62e9\u56fe\u7247\u6587\u4ef6', 'error');
            return;
        }

        if (file.size > MAX_AVATAR_SIZE) {
            notify('\u56fe\u7247\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc72MB', 'error');
            return;
        }

        const formData = new FormData();
        formData.append('avatar', file);

        const userIdInput = getElement('userIdInput');
        if (userIdInput) {
            formData.append('userId', userIdInput.value);
        }

        notify('\u6b63\u5728\u4e0a\u4f20\u5934\u50cf...');

        try {
            const data = await uploadAvatar(formData);
            if (!data.success || !data.avatarUrl) {
                throw new Error(data.message || '\u672a\u77e5\u9519\u8bef');
            }

            setAvatarPreview(data.avatarUrl);
            saveSettings();
            notify('\u5934\u50cf\u4e0a\u4f20\u6210\u529f', 'success');
        } catch (error) {
            logger.error('Error uploading avatar:', error);
            setAvatarPreview(DEFAULT_AVATAR);
            notify('\u5934\u50cf\u4e0a\u4f20\u5931\u8d25\uff0c\u8bf7\u91cd\u8bd5', 'error');
        }
    }

    function copyUserId() {
        const userIdInput = getElement('userIdInput');
        if (!userIdInput) {
            return;
        }

        userIdInput.select();
        document.execCommand('copy');
        notify('\u7528\u6237ID\u5df2\u590d\u5236\u5230\u526a\u8d34\u677f', 'success');
    }

    function toggleSettingsMenu() {
        const settingsMenu = getElement('settingsMenu');
        if (settingsMenu) {
            settingsMenu.classList.toggle('hidden');
        }
    }

    function bindDocumentEvents() {
        if (documentEventsBound) {
            return;
        }

        document.addEventListener('click', (event) => {
            const settingsMenu = getElement('settingsMenu');
            const userSettingsButton = getElement('userSettingsBtn');

            if (
                settingsMenu &&
                userSettingsButton &&
                !settingsMenu.contains(event.target) &&
                !userSettingsButton.contains(event.target)
            ) {
                settingsMenu.classList.add('hidden');
            }
        });

        documentEventsBound = true;
    }

    function bindWindowHandlers() {
        window.saveSettings = saveSettings;
        window.handleAvatarUpload = handleAvatarUpload;
        window.copyUserId = copyUserId;
        window.toggleSettingsMenu = toggleSettingsMenu;
    }

    return {
        bindDocumentEvents,
        bindWindowHandlers,
        copyUserId,
        handleAvatarUpload,
        loadUserSettings,
        saveSettings,
        toggleSettingsMenu
    };
}