/**
 * 零依赖 Chrome DevTools Protocol 驱动 —— `puppeteer-core` 缺失时的走查替代。
 *
 * ── 为什么需要它 ──
 * 本仓所有真机走查都 import `puppeteer-core`（在 `~/.dsh/profiles/desktop/node_modules` 下，
 * 属于工具层而非仓库依赖）。该模块在本机已消失，导致 `t28-fill-container.mjs` 等直接
 * `ERR_MODULE_NOT_FOUND`。Chrome 本身在（`C:\Program Files\Google\Chrome\Application\chrome.exe`），
 * 而 Node 24 自带全局 `WebSocket` 与 `fetch`，所以"驱动浏览器"这件事**不需要任何依赖**。
 *
 * ── 它是什么、不是什么 ──
 * 只实现走查真正用到的那一小撮 puppeteer API（`launch`/`newPage`/`goto`/`evaluate`/
 * `evaluateOnNewDocument`/`waitForSelector`/`waitForFunction`/`$`/`click`/`on`/`close`），
 * 用 CDP 原生命令实现。**不是** puppeteer 的通用替代：没有选择器语法、没有元素句柄、
 * 没有网络拦截。要那些能力请恢复 `puppeteer-core`。
 *
 * ── 用法 ──
 *   const browser = await cdpLaunch({ executablePath: CHROME, width: 1680, height: 950 })
 *   const page = await browser.newPage()
 *   await page.goto(url, { timeout: 60000 })
 *
 * 注意：Chrome 启动需要放宽沙箱（受限模式下 crashpad 会 `OpenProcess: 拒绝访问 (0x5)` 自杀）。
 */
import { spawn } from 'node:child_process'
import { mkdtempSync, readFileSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))

/** 与 CDP 的一条 WebSocket 连接：发命令、按 id 收响应、把事件分发给订阅者。 */
class Connection {
    constructor(ws) {
        this.ws = ws
        this.seq = 0
        this.pending = new Map()
        this.handlers = new Set()
        ws.addEventListener('message', (event) => {
            let message = null
            try {
                message = JSON.parse(event.data)
            } catch {
                return
            }
            if (message.id !== undefined) {
                const slot = this.pending.get(message.id)
                if (!slot) return
                this.pending.delete(message.id)
                if (message.error) slot.reject(new Error(`${slot.method}: ${message.error.message}`))
                else slot.resolve(message.result)
                return
            }
            for (const handler of this.handlers) handler(message)
        })
    }

    send(method, params = {}, sessionId) {
        const id = ++this.seq
        const payload = { id, method, params }
        if (sessionId) payload.sessionId = sessionId
        this.ws.send(JSON.stringify(payload))
        return new Promise((resolve, reject) => {
            this.pending.set(id, { resolve, reject, method })
        })
    }

    onMessage(handler) {
        this.handlers.add(handler)
        return () => this.handlers.delete(handler)
    }
}

class Page {
    constructor(conn, sessionId) {
        this.conn = conn
        this.sessionId = sessionId
        this.listeners = { pageerror: [], console: [] }
        this.mouse = {
            move: async (x, y) => this._dispatchMouse('mouseMoved', x, y),
            click: async (x, y, options = {}) => {
                const button = options.button || 'left'
                await this._dispatchMouse('mouseMoved', x, y)
                await this._dispatchMouse('mousePressed', x, y, { button, clickCount: options.clickCount || 1 })
                await this._dispatchMouse('mouseReleased', x, y, { button, clickCount: options.clickCount || 1 })
            },
        }
        this._onMessage = (message) => {
            if (message.sessionId !== this.sessionId) return
            if (message.method === 'Runtime.exceptionThrown') {
                const details = message.params.exceptionDetails || {}
                const text = (details.exception && (details.exception.description || details.exception.value)) || details.text || 'unknown'
                for (const cb of this.listeners.pageerror) cb(text)
            }
            if (message.method === 'Runtime.consoleAPICalled' && message.params.type === 'error') {
                const text = (message.params.args || [])
                    .map((a) => (a.value !== undefined ? a.value : a.description || ''))
                    .join(' ')
                // 形状对齐 puppeteer（`m.type()` / `m.text()`）：走查脚本按那套写，不该为驱动改姿势。
                for (const cb of this.listeners.console) cb({ type: () => 'error', text: () => text })
            }
        }
    }

    async _init() {
        this.conn.onMessage(this._onMessage)
        await this.conn.send('Page.enable', {}, this.sessionId)
        await this.conn.send('Runtime.enable', {}, this.sessionId)
    }

    /**
     * 截图（返回 base64；`format` 默认 png）。
     *
     * 票 47 的"真实帧差"证据用它：同一视角隔一小段时间截两帧，
     * **字节不同 ⇒ 画面确实在变**（PNG 对同一输入是确定性编码）。
     * 关掉特效时两帧应当**字节相同**（画面静止）—— 这一对断言才排除了"其实没在动"。
     */
    async screenshot(options = {}) {
        const result = await this.conn.send('Page.captureScreenshot', {
            format: options.format || 'png',
            ...(options.clip ? { clip: options.clip } : {}),
        }, this.sessionId)
        return result && result.data ? result.data : ''
    }

    async _dispatchMouse(type, x, y, extra = {}) {
        return this.conn.send('Input.dispatchMouseEvent', {
            type,
            x: Number(x),
            y: Number(y),
            button: extra.button || 'none',
            buttons: extra.buttons === undefined ? (type === 'mousePressed' ? 1 : 0) : extra.buttons,
            clickCount: extra.clickCount || 0,
            pointerType: 'mouse',
        }, this.sessionId)
    }

    on(event, cb) {
        if (this.listeners[event]) this.listeners[event].push(cb)
        return this
    }

    /** 在**页面上下文**里跑一段函数；参数会被 JSON 序列化后代入。 */
    async evaluate(fn, ...args) {
        const expression = `(${fn.toString()})(${args.map((a) => JSON.stringify(a)).join(',')})`
        const { result, exceptionDetails } = await this.conn.send(
            'Runtime.evaluate',
            { expression, awaitPromise: true, returnByValue: true },
            this.sessionId,
        )
        if (exceptionDetails) {
            const text = (exceptionDetails.exception && exceptionDetails.exception.description) || exceptionDetails.text
            throw new Error(`evaluate 失败：${text}`)
        }
        return result.value
    }

    /** 注册"每次新文档都先跑一遍"的脚本（注入 mock 场景等）。 */
    async evaluateOnNewDocument(fn, ...args) {
        const source = `(${fn.toString()})(${args.map((a) => JSON.stringify(a)).join(',')})`
        await this.conn.send('Page.addScriptToEvaluateOnNewDocument', { source }, this.sessionId)
    }

    /** 导航并等到 `readyState === 'complete'`（puppeteer 的 networkidle2 由调用方补 sleep 近似）。 */
    async goto(url, options = {}) {
        const timeout = options.timeout || 60000
        await this.conn.send('Page.navigate', { url }, this.sessionId)
        const deadline = Date.now() + timeout
        for (;;) {
            try {
                const ready = await this.evaluate(() => document.readyState)
                if (ready === 'complete') return
            } catch {
                /* 导航中途上下文会被销毁，重试即可 */
            }
            if (Date.now() > deadline) throw new Error(`goto 超时：${url}`)
            await sleep(100)
        }
    }

    async waitForSelector(selector, options = {}) {
        const timeout = options.timeout || 20000
        const deadline = Date.now() + timeout
        const hidden = options.hidden === true
        for (;;) {
            const state = await this.evaluate((sel) => {
                const el = document.querySelector(sel)
                if (!el) return 'missing'
                const rect = el.getBoundingClientRect()
                const styled = window.getComputedStyle(el)
                const invisible = styled.display === 'none' || styled.visibility === 'hidden' || rect.width + rect.height === 0
                return invisible ? 'hidden' : 'visible'
            }, selector).catch(() => 'missing')
            if (hidden ? state !== 'visible' : state === 'visible') return
            if (Date.now() > deadline) throw new Error(`waitForSelector 超时：${selector}`)
            await sleep(80)
        }
    }

    async waitForFunction(fn, options = {}, ...args) {
        const timeout = options.timeout || 20000
        const deadline = Date.now() + timeout
        for (;;) {
            const ok = await this.evaluate(fn, ...args).catch(() => false)
            if (ok) return
            if (Date.now() > deadline) throw new Error('waitForFunction 超时')
            await sleep(80)
        }
    }

    /** 与 puppeteer 一致：命中回一个真值对象，未命中回 null。 */
    async $(selector) {
        const found = await this.evaluate((sel) => !!document.querySelector(sel), selector).catch(() => false)
        return found ? { selector } : null
    }

    async click(selector) {
        const clicked = await this.evaluate((sel) => {
            const el = document.querySelector(sel)
            if (!el) return false
            el.click()
            return true
        }, selector)
        if (!clicked) throw new Error(`click 找不到元素：${selector}`)
    }

    async close() {
        this.conn.onMessage(() => {})
        this.conn.handlers.delete(this._onMessage)
        await this.conn.send('Target.closeTarget', { targetId: this.targetId }).catch(() => {})
    }
}

class Browser {
    constructor(conn, info) {
        this.conn = conn
        this.child = info.child
        this.userDataDir = info.userDataDir
        this.versionInfo = info.version
    }

    async version() {
        return this.versionInfo.Browser || 'chrome'
    }

    async newPage() {
        const { targetId } = await this.conn.send('Target.createTarget', { url: 'about:blank' })
        const { sessionId } = await this.conn.send('Target.attachToTarget', { targetId, flatten: true })
        const page = new Page(this.conn, sessionId)
        page.targetId = targetId
        await page._init()
        return page
    }

    async close() {
        try {
            this.conn.ws.close()
        } catch {
            /* 已经断了就算了 */
        }
        try {
            this.child.kill()
        } catch {
            /* 同上 */
        }
        await sleep(200)
        try {
            rmSync(this.userDataDir, { recursive: true, force: true })
        } catch {
            /* 临时目录清不掉不影响结论 */
        }
    }
}

/**
 * 启动 Chrome 并连上它的浏览器级 WebSocket。
 * `--remote-debugging-port=0` 让系统分配端口，Chrome 会把真实端口写进
 * `<user-data-dir>/DevToolsActivePort`，从而不会和其它 Chrome 抢 9222。
 */
export async function cdpLaunch(options = {}) {
    const width = options.width || 1680
    const height = options.height || 950
    const userDataDir = mkdtempSync(join(tmpdir(), 'cdp-cockpit-'))
    const args = [
        '--headless=new',
        '--remote-debugging-port=0',
        `--user-data-dir=${userDataDir}`,
        `--window-size=${width},${height}`,
        '--no-first-run',
        '--no-default-browser-check',
        '--disable-gpu',
        '--no-sandbox',
        '--disable-dev-shm-usage',
        ...(options.args || []),
        'about:blank',
    ]
    // stdio 用 ignore：受限模式下"捕获子进程输出"会 EPERM，而 Chrome 的日志对结论无用。
    const child = spawn(options.executablePath, args, { stdio: 'ignore' })

    const portFile = join(userDataDir, 'DevToolsActivePort')
    let raw = ''
    for (let i = 0; i < 200; i += 1) {
        try {
            raw = readFileSync(portFile, 'utf8')
            if (raw.trim()) break
        } catch {
            /* 还没写出来 */
        }
        await sleep(100)
    }
    const port = Number(String(raw).split('\n')[0].trim())
    if (!port) {
        child.kill()
        throw new Error('Chrome 没写出 DevToolsActivePort —— 大概率是沙箱把它的 IPC 拦掉了')
    }

    const version = await fetch(`http://127.0.0.1:${port}/json/version`).then((r) => r.json())
    const ws = new WebSocket(version.webSocketDebuggerUrl)
    await new Promise((resolve, reject) => {
        ws.addEventListener('open', resolve, { once: true })
        ws.addEventListener('error', () => reject(new Error('连不上 Chrome 的调试 WebSocket')), { once: true })
    })
    return new Browser(new Connection(ws), { child, userDataDir, version })
}