const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');
const source = fs.readFileSync(path.join(__dirname, '../../static/js/admin.js'), 'utf8');
const flush = () => new Promise(setImmediate);

function response(data, status = 200){
    return {ok: status >= 200 && status < 300, status, json: async () => data};
}

async function workspace(compact = false){
    const elements = new Map();
    const documentListeners = {};
    let document;
    class Element {
        constructor(){
            this.value = ''; this.children = []; this.attributes = {}; this.listeners = {};
            this.style = {}; this.hidden = false; this.scrollHeight = 70;
            this.scrollTop = 0; this.clientHeight = 300;
            const classes = new Set();
            this.classList = {
                toggle: (name, enabled) => { enabled ? classes.add(name) : classes.delete(name); },
                contains: name => classes.has(name),
            };
        }
        set innerHTML(value){ this.html = value; this.children = []; }
        get innerHTML(){ return this.html || ''; }
        setAttribute(name, value){ this.attributes[name] = value; }
        toggleAttribute(name, enabled){ if(enabled) this.attributes[name] = ''; else delete this.attributes[name]; }
        appendChild(element){ this.children.push(element); }
        addEventListener(name, callback){ this.listeners[name] = callback; }
        querySelectorAll(){ return []; }
        focus(){ document.activeElement = this; }
        click(){ if(this.onclick) return this.onclick(); }
    }
    const quickButtons = [new Element(), new Element()];
    document = {
        body: new Element(), activeElement: null,
        getElementById(id){ if(!elements.has(id)) elements.set(id, new Element()); return elements.get(id); },
        createElement(){ return new Element(); },
        querySelectorAll(selector){ return selector === '.quick' ? quickButtons : []; },
        addEventListener(name, callback){ documentListeners[name] = callback; },
    };
    const calls = [];
    const hooks = {};
    const context = vm.createContext({
        document, console,
        window: {matchMedia: () => ({matches: compact}), addEventListener(){}},
        setInterval(){}, setTimeout(){}, clearTimeout(){},
        fetch: async (url, options) => {
            const body = options && options.body ? JSON.parse(options.body) : undefined;
            calls.push({url, body});
            if(url === '/api/human/send' && hooks.send) return hooks.send(body);
            if(url === '/api/human/close' && hooks.close) return hooks.close(body);
            if(url.includes('/api/human/poll')) return response({status:'active', messages:[]});
            if(url === '/api/admin/stats') return response({total_conv:0, total_msg:0, today_conv:0, good:0, bad:0});
            return response(options ? {ok:true} : []);
        },
    });
    vm.runInContext(source, context, {filename:'admin.js'});
    await flush();
    await context.accept(7);
    await flush();
    return {context, element: id => document.getElementById(id), calls, hooks, document, documentListeners};
}

test('failed replies preserve the draft and make retry available', async () => {
    const app = await workspace();
    app.hooks.send = () => response({ok:false}, 503);
    app.element('replyText').value = '请确认这批货物的外箱尺寸';
    await app.context.sendReply();
    assert.equal(app.element('replyText').value, '请确认这批货物的外箱尺寸');
    assert.equal(app.element('reply-send').disabled, false);
    assert.match(app.element('reply-status').textContent, /内容已保留/);
    app.hooks.send = () => response({ok:true});
    await app.context.sendReply();
    assert.equal(app.element('replyText').value, '');
});

test('a second send click cannot duplicate an in-flight reply', async () => {
    const app = await workspace();
    let resolve;
    app.hooks.send = () => new Promise(done => { resolve = done; });
    app.element('replyText').value = '正在确认线路';
    const first = app.context.sendReply();
    await app.context.sendReply();
    assert.equal(app.calls.filter(call => call.url === '/api/human/send').length, 1);
    assert.equal(app.element('reply-send').disabled, true);
    resolve(response({ok:true}));
    await first;
});

test('new text typed while a reply is sending is retained', async () => {
    const app = await workspace();
    let resolve;
    app.hooks.send = () => new Promise(done => { resolve = done; });
    const input = app.element('replyText');
    input.value = '第一条回复';
    const sending = app.context.sendReply();
    input.value = '继续补充的第二条回复';
    input.listeners.input();
    resolve(response({ok:true}));
    await sending;
    assert.equal(input.value, '继续补充的第二条回复');
});

test('switching sessions during a send does not erase another customer draft', async () => {
    const app = await workspace();
    await app.context.accept(8);
    app.element('replyText').value = '客户 8 的草稿';
    app.context.switchSession('7');
    app.element('replyText').value = '发给客户 7';
    let resolve;
    app.hooks.send = () => new Promise(done => { resolve = done; });
    const sending = app.context.sendReply();
    app.context.switchSession('8');
    resolve(response({ok:true}));
    await sending;
    assert.equal(app.context.curSid, '8');
    assert.equal(app.element('replyText').value, '客户 8 的草稿');
    app.context.switchSession('7');
    assert.equal(app.element('replyText').value, '');
});

test('quick replies become editable drafts before sending', async () => {
    const app = await workspace();
    app.context.quickReply('请提供运单号');
    assert.equal(app.element('replyText').value, '请提供运单号');
    assert.equal(app.calls.filter(call => call.url === '/api/human/send').length, 0);
    assert.match(app.element('reply-status').textContent, /可编辑后发送/);
});

test('a failed close keeps the selected session and reply visible', async () => {
    const app = await workspace();
    app.hooks.close = () => response({ok:false}, 503);
    await app.context.closeSession();
    assert.equal(app.context.curSid, '7');
    assert.equal(app.element('chatContent').style.display, 'flex');
    assert.match(app.element('reply-status').textContent, /会话仍保留/);
});

test('IME confirmation and Shift+Enter do not submit a reply', async () => {
    const app = await workspace();
    app.element('replyText').value = '正在输入中文';
    const onKey = app.element('replyText').listeners.keydown;
    const preventDefault = () => {};
    onKey({key:'Enter', isComposing:true, shiftKey:false, preventDefault});
    onKey({key:'Enter', isComposing:false, shiftKey:true, preventDefault});
    await flush();
    assert.equal(app.calls.filter(call => call.url === '/api/human/send').length, 0);
    onKey({key:'Enter', isComposing:false, shiftKey:false, preventDefault});
    await flush();
    assert.equal(app.calls.filter(call => call.url === '/api/human/send').length, 1);
});

test('the compact service drawer is keyboard accessible and closes on Escape', async () => {
    const app = await workspace(true);
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'true');
    app.context.setToolsOpen(true);
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'false');
    assert.equal(app.document.activeElement, app.element('tools-close'));
    app.documentListeners.keydown({key:'Escape'});
    assert.equal(app.element('tools-toggle').attributes['aria-expanded'], 'false');
    assert.equal(app.document.activeElement, app.element('tools-toggle'));
});

test('desktop service information starts closed and can be toggled on demand', async () => {
    const app = await workspace();
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'true');
    app.context.setToolsOpen(true);
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'false');
    assert.equal(app.element('tools-toggle').attributes['aria-expanded'], 'true');
    app.context.setToolsOpen(false);
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'true');
});

test('returning to the mobile session list keeps the selected session and draft', async () => {
    const app = await workspace(true);
    app.element('replyText').value = '返回列表前的草稿';
    app.context.showSessionList();
    assert.equal(app.context.curSid, '7');
    assert.equal(app.document.body.classList.contains('chat-view'), false);
    assert.equal(app.document.activeElement, app.element('tab-active'));
    assert.equal(app.element('replyText').value, '返回列表前的草稿');
    app.context.switchSession('7');
    assert.equal(app.document.body.classList.contains('chat-view'), true);
    assert.equal(app.element('replyText').value, '返回列表前的草稿');
    assert.equal(app.calls.filter(call => call.url === '/api/human/close').length, 0);
});

test('mobile operators can open service information without selecting a conversation', async () => {
    const app = await workspace(true);
    app.context.showEmptySession();
    app.element('tools-from-list').click();
    assert.equal(app.element('service-tools').attributes['aria-hidden'], 'false');
    app.element('tools-close').click();
    assert.equal(app.document.activeElement, app.element('tools-from-list'));
});

test('mobile drafts are measured after the chat view becomes visible', async () => {
    const app = await workspace(true);
    const input = app.element('replyText');
    Object.defineProperty(input, 'scrollHeight', {
        get: () => app.document.body.classList.contains('chat-view') ? 128 : 0,
    });
    input.value = '需要恢复的多行草稿';
    app.context.showSessionList();
    app.context.switchSession('7');
    assert.equal(input.style.height, '128px');
    assert.equal(input.value, '需要恢复的多行草稿');
});