const { ipcRenderer, shell } = require('electron');
const axios = require('axios');
const fs = require('fs');
const path = require('path');
const TurndownService = require('turndown');
const { marked } = require('marked');

// Глобальные сервисы
const turndownService = new TurndownService({ headingStyle: 'atx', codeBlockStyle: 'fenced' });
const rootPath = process.cwd();
const SETTINGS_PATH = path.join(rootPath, 'settings.json');

// Глобальное состояние
let currentFilePath = "";
let settings = {};
let translations = {};
let allNotes = [];
let isPreviewMode = false;

// --- 1. СИСТЕМНЫЕ ФУНКЦИИ (ОКНО) ---
window.closeApp = () => ipcRenderer.send('close-app');
window.minimizeApp = () => ipcRenderer.send('minimize-app');

// --- 2. ИНИЦИАЛИЗАЦИЯ ---
window.onload = () => {
    loadSettingsFromFile();
    loadLocalization();
    applyTheme(settings.theme || 'dark');
    loadSettingsIntoUI();
    refreshFileList();
    initDragAndDrop();
    initContextMenu();
    initHotkeys();
    initScrollSync();
    console.log("ObsidianPad Ready");
};

function loadSettingsFromFile() {
    try {
        if (fs.existsSync(SETTINGS_PATH)) {
            settings = JSON.parse(fs.readFileSync(SETTINGS_PATH, 'utf8'));
        } else {
            settings = {
                theme: "dark", lang: "ru", obsFolder: "",
                obsApiUrl: "http://127.0.0.1:27123", obsApiKey: "",
                titleUrl: "", titleKey: "", titleModel: "",
                transUrl: "", transKey: "", transModel: ""
            };
            fs.writeFileSync(SETTINGS_PATH, JSON.stringify(settings, null, 2));
        }
    } catch (e) { console.error(e); }
}

function loadLocalization() {
    try {
        const langPath = path.join(rootPath, 'lang.json');
        if (fs.existsSync(langPath)) {
            translations = JSON.parse(fs.readFileSync(langPath, 'utf8'));
            updateUIStrings();
        }
    } catch (e) { console.error(e); }
}

function updateUIStrings() {
    const lang = settings.lang || 'ru';
    const dict = translations[lang];
    if (!dict) return;
    document.querySelectorAll('[data-i18n]').forEach(el => {
        const key = el.getAttribute('data-i18n');
        if (dict[key]) el.innerText = dict[key];
    });
}

// --- 3. OBSIDIAN API ---
async function obsReq(urlPath, method = 'GET', data = null, headers = {}) {
    if (!settings.obsApiUrl || !settings.obsApiKey) return null;
    const baseUrl = settings.obsApiUrl.replace(/\/+$/, '');
    try {
        const config = {
            url: `${baseUrl}${urlPath}`,
            method, data,
            headers: { 
                'Authorization': `Bearer ${settings.obsApiKey.trim()}`, 
                'Content-Type': 'text/markdown',
                'Accept': 'application/json',
                ...headers 
            },
            timeout: 5000
        };
        const res = await axios(config);
        return res.data;
    } catch (e) {
        console.error("Obsidian API Connection Failed");
        return null;
    }
}

window.refreshFileList = async () => {
    let folder = (settings.obsFolder || "").trim().replace(/^\/+|\/+$/g, '');
    const data = await obsReq(folder === "" ? "/vault/" : `/vault/${folder}/`);
    if (data && data.files) {
        allNotes = data.files.filter(f => f.endsWith('.md') && f !== 'temp.md');
        window.filterNotes(document.getElementById('note-search').value || "");
    }
};

window.filterNotes = (query) => {
    const select = document.getElementById('file-list');
    const folder = (settings.obsFolder || "").trim().replace(/^\/+|\/+$/g, '');
    const q = query.toLowerCase();
    const lang = settings.lang || 'ru';
    select.innerHTML = `<option value="">${translations[lang]?.select_note || "Заметки..."}</option>`;
    allNotes.forEach(f => {
        if (f.toLowerCase().includes(q)) {
            const opt = document.createElement('option');
            opt.value = folder === "" ? f : `${folder}/${f}`;
            opt.textContent = f.replace('.md', '');
            select.appendChild(opt);
        }
    });
    if (currentFilePath) select.value = currentFilePath;
};

window.loadFile = async (path) => {
    if (!path) return;
    const content = await obsReq(`/vault/${path}`);
    if (content !== null) {
        document.getElementById('editor').value = (typeof content === 'string') ? content : JSON.stringify(content);
        currentFilePath = path;
        if (isPreviewMode) window.updatePreview();
        window.updateStats();
        document.getElementById('status').innerText = "Loaded: " + path.split('/').pop();
    }
};

window.closeFile = () => {
    currentFilePath = "";
    document.getElementById('editor').value = "";
    document.getElementById('file-list').value = "";
    if (isPreviewMode) window.togglePreview();
    window.updateStats();
    document.getElementById('status').innerText = "Ready";
};

// --- 4. СОХРАНЕНИЕ И НОВАЯ ЗАМЕТКА ---
window.handleSaveAction = async () => {
    if (!currentFilePath) window.openNewNoteModal(); 
    else window.saveCurrentFile();
};

window.saveCurrentFile = async () => {
    if (!currentFilePath) return;
    const content = document.getElementById('editor').value;
    const res = await obsReq(`/vault/${currentFilePath}`, 'PUT', content);
    if (res !== null) {
        document.getElementById('status').innerText = "Saved: " + new Date().toLocaleTimeString();
        if (isPreviewMode) window.updatePreview();
    }
};

window.openNewNoteModal = () => {
    const content = document.getElementById('editor').value;
    if (!content.trim()) return;
    document.getElementById('new-note-modal').classList.remove('hidden');
    document.getElementById('new-note-title').value = "";
    document.getElementById('modal-status').innerText = "";
};

window.closeNewNoteModal = () => document.getElementById('new-note-modal').classList.add('hidden');

window.confirmCreateNote = async () => {
    const title = document.getElementById('new-note-title').value.trim();
    if (!title) return;
    const content = document.getElementById('editor').value;
    let folder = (settings.obsFolder || "").trim().replace(/^\/+|\/+$/g, '');
    const fullPath = (folder ? folder + "/" : "") + title + ".md";
    const res = await obsReq(`/vault/${fullPath}`, 'PUT', content);
    if (res !== null) {
        currentFilePath = fullPath;
        await obsReq(`/vault/${folder ? folder + "/" : ""}temp.md`, 'PUT', "");
        window.closeNewNoteModal();
        await window.refreshFileList();
        window.loadFile(fullPath);
    }
};

// --- 5. ИИ ФУНКЦИИ ---
async function fetchAIChat(type, system, user) {
    const url = settings[`${type}Url`];
    const key = settings[`${type}Key`];
    const model = settings[`${type}Model`];
    if (!url || !model) return null;
    try {
        const res = await axios.post(`${url.replace(/\/models$/, '').replace(/\/+$/, '')}/chat/completions`, {
            model, messages: [{role: "system", content: system}, {role: "user", content: user.substring(0, 2000)}]
        }, { headers: { 'Authorization': `Bearer ${key}` } });
        return res.data.choices[0].message.content.trim();
    } catch (e) { return null; }
}

window.generateTitleForModal = async () => {
    const content = document.getElementById('editor').value;
    const status = document.getElementById('modal-status');
    status.innerText = "AI Generation...";
    const title = await fetchAIChat('title', "Create a 2-word title. Return ONLY text.", content);
    if (title) {
        document.getElementById('new-note-title').value = title.replace(/[\\/:"*?<>|]/g, "").trim();
        status.innerText = "";
    } else {
        status.innerText = "AI Error";
    }
};

window.generateTitleDirect = async () => {
    if (!currentFilePath) return;
    const title = await fetchAIChat('title', "Create 2-word title. Text only.", document.getElementById('editor').value);
    if (title) {
        const clean = title.replace(/[\\/:"*?<>|]/g, "").trim();
        const folder = currentFilePath.includes('/') ? currentFilePath.substring(0, currentFilePath.lastIndexOf('/') + 1) : '';
        const newPath = `${folder}${clean}.md`;
        if (await obsReq(`/vault/${currentFilePath}`, 'PATCH', null, { 'X-File-Name': newPath })) {
            currentFilePath = newPath; window.refreshFileList();
        }
    }
};

window.translateText = async () => {
    const content = document.getElementById('editor').value;
    if (!content) return;
    document.getElementById('status').innerText = "Translating...";
    const res = await fetchAIChat('trans', "Translate to Russian. Keep markdown.", content);
    if (res) { document.getElementById('editor').value = res; window.saveCurrentFile(); }
};

// --- 6. РЕДАКТОР ---
window.insertText = (type) => {
    const el = document.getElementById('editor');
    const s = el.selectionStart, e = el.selectionEnd, sel = el.value.substring(s, e);
    let r = "";
    switch(type) {
        case 'H1': r = `# ${sel}`; break;
        case 'H2': r = `## ${sel}`; break;
        case 'H3': r = `### ${sel}`; break;
        case 'B': r = `**${sel}**`; break;
        case 'I': r = `*${sel}*`; break;
        case 'CODE': r = `\`\`\`\n${sel}\n\`\`\``; break;
        case 'LINK': r = `[${sel}](url)`; break;
        case 'UL': r = `- ${sel}`; break;
    }
    el.setRangeText(r, s, e, 'select');
    el.focus();
    window.updateStats();
};

window.togglePreview = () => {
    isPreviewMode = !isPreviewMode;
    const editor = document.getElementById('editor');
    const preview = document.getElementById('preview');
    const btn = document.getElementById('preview-toggle');
    if (isPreviewMode) {
        window.updatePreview();
        editor.classList.add('hidden');
        preview.classList.remove('hidden');
        btn.classList.add('active');
    } else {
        editor.classList.remove('hidden');
        preview.classList.add('hidden');
        btn.classList.remove('active');
    }
};

window.updatePreview = () => {
    document.getElementById('preview').innerHTML = marked.parse(document.getElementById('editor').value);
};

window.updateStats = () => {
    const val = document.getElementById('editor').value;
    const lines = val.split('\n').length;
    const words = val.trim() ? val.trim().split(/\s+/).length : 0;
    document.getElementById('stats').innerHTML = `стр: ${lines} &nbsp; слов: ${words}`;
};

// --- 7. НАСТРОЙКИ ---
window.toggleSettings = () => document.getElementById('settings').classList.toggle('hidden');
window.applyTheme = (t) => { document.body.className = t === 'light' ? 'light-theme' : 'dark-theme'; };
window.previewTheme = (t) => window.applyTheme(t);
window.changeLang = (l) => { settings.lang = l; updateUIStrings(); };

window.saveSettings = () => {
    settings = {
        theme: document.getElementById('app-theme').value,
        lang: document.getElementById('app-lang').value,
        obsFolder: document.getElementById('obs-folder').value,
        obsApiUrl: document.getElementById('obs-api-url').value,
        obsApiKey: document.getElementById('obs-api-key').value,
        titleUrl: document.getElementById('ai-title-url').value,
        titleKey: document.getElementById('ai-title-key').value,
        titleModel: document.getElementById('ai-title-model').value,
        transUrl: document.getElementById('ai-trans-url').value,
        transKey: document.getElementById('ai-trans-key').value,
        transModel: document.getElementById('ai-trans-model').value
    };
    fs.writeFileSync(SETTINGS_PATH, JSON.stringify(settings, null, 2));
    window.applyTheme(settings.theme);
    window.toggleSettings();
    window.refreshFileList();
};

function loadSettingsIntoUI() {
    const s = settings;
    document.getElementById('app-theme').value = s.theme || "dark";
    document.getElementById('app-lang').value = s.lang || "ru";
    document.getElementById('obs-folder').value = s.obsFolder || "";
    document.getElementById('obs-api-url').value = s.obsApiUrl || "";
    document.getElementById('obs-api-key').value = s.obsApiKey || "";
    document.getElementById('ai-title-url').value = s.titleUrl || "";
    document.getElementById('ai-title-key').value = s.titleKey || "";
    document.getElementById('ai-trans-url').value = s.transUrl || "";
    document.getElementById('ai-trans-key').value = s.transKey || "";
    if (s.titleModel) addOption('ai-title-model', s.titleModel);
    if (s.transModel) addOption('ai-trans-model', s.transModel);
}

function addOption(id, val) {
    const sel = document.getElementById(id);
    if(sel) sel.innerHTML = `<option value="${val}">${val}</option>`;
}

window.fetchModels = async (type) => {
    let url = document.getElementById(`ai-${type}-url`).value.trim();
    const key = document.getElementById(`ai-${type}-key`).value.trim();
    if (!url) return;
    if (!url.endsWith('/models')) url = url.replace(/\/+$/, '') + '/models';
    try {
        const res = await axios.get(url, { headers: { 'Authorization': `Bearer ${key}` } });
        const select = document.getElementById(`ai-${type}-model`);
        select.innerHTML = "";
        const models = res.data.data || res.data;
        if (Array.isArray(models)) {
            models.forEach(m => {
                const id = m.id || m.name || m;
                const opt = document.createElement('option');
                opt.value = id; opt.textContent = id;
                select.appendChild(opt);
            });
        }
    } catch (e) { alert("AI Models Error"); }
};

// --- 8. ВСПОМОГАТЕЛЬНЫЕ ---
window.openAbout = () => {
    try {
        const aboutPath = path.join(rootPath, 'about.json');
        const about = JSON.parse(fs.readFileSync(aboutPath, 'utf8'));
        document.getElementById('about-name').innerText = about.appName;
        document.getElementById('about-desc').innerText = about.description;
        document.getElementById('about-ver').innerText = about.version;
        document.getElementById('about-auth').innerText = about.author;
        const link = document.getElementById('about-link');
        link.onclick = (e) => { e.preventDefault(); shell.openExternal(about.github); };
        document.getElementById('about-modal').classList.remove('hidden');
    } catch(e) { alert("about.json error"); }
};
window.closeAbout = () => document.getElementById('about-modal').classList.add('hidden');

function initContextMenu() {
    const menu = document.getElementById('context-menu');
    if(!menu) return;
    window.oncontextmenu = (e) => { e.preventDefault(); menu.style.top = e.pageY+'px'; menu.style.left = e.pageX+'px'; menu.classList.remove('hidden'); };
    window.onclick = () => menu.classList.add('hidden');
}

function initDragAndDrop() {
    const ed = document.getElementById('editor');
    ed.ondrop = async (e) => {
        e.preventDefault();
        const html = e.dataTransfer.getData('text/html');
        if (html) { ed.setRangeText(turndownService.turndown(html), ed.selectionStart, ed.selectionEnd, 'end'); }
    };
}

function initHotkeys() {
    window.onkeydown = (e) => {
        if (e.ctrlKey) {
            if (e.key === 's') { e.preventDefault(); window.handleSaveAction(); }
            if (e.key === 'n') { e.preventDefault(); window.openNewNoteModal(); }
            if (e.key === 'w') { e.preventDefault(); window.closeFile(); }
            if (e.key === 'p') { e.preventDefault(); window.togglePreview(); }
        }
    };
}

function initScrollSync() {
    const ed = document.getElementById('editor');
    const pr = document.getElementById('preview');
    ed.onscroll = () => { if (!isPreviewMode) pr.scrollTop = (ed.scrollTop / (ed.scrollHeight - ed.clientHeight)) * (pr.scrollHeight - pr.clientHeight); };
}

window.insertImageClick = () => document.getElementById('image-input').click();