"use strict";
const { app, BrowserWindow, Tray, Menu, screen, ipcMain, nativeImage, shell, dialog } = require("electron");
const http = require("node:http");
const fs = require("node:fs");
const path = require("node:path");
const os = require("node:os");
const autostart = require("./lib/autostart");
const hooksInstaller = require("./lib/hooks-installer");

const APP_DIR = __dirname;
const HOME = os.homedir();
const CONFIG_DIR = path.join(HOME, ".claude-pet");
const CONFIG_PATH = path.join(CONFIG_DIR, "config.json");
const LOG_PATH = path.join(CONFIG_DIR, "events.log");

const CELL_W = 192;
const CELL_H = 208;
const BUBBLE_H = 72;   // 氣泡保留高度
const PAD_X = 24;      // 左右透明邊
const PAD_BOTTOM = 8;
const SCALES = [0.5, 0.75, 1, 1.25, 1.5];

const DEFAULT_CONFIG = {
  activePetId: "xiao-nian",
  petSources: [path.join(APP_DIR, "pets"), path.join(HOME, ".codex", "pets")],
  scale: 1,
  position: null,
  alwaysOnTop: true,
  followCursor: true,
  port: 17333,
};

let config = loadConfig();
let win = null;
let tray = null;
let pets = [];
let dragTimer = null;
let cursorTimer = null;
let lastCursor = { x: NaN, y: NaN };
let currentState = { anim: "idle", base: "idle", sessions: 0 };

// ---------- config ----------

function loadConfig() {
  let saved = {};
  try { saved = JSON.parse(fs.readFileSync(CONFIG_PATH, "utf8")); } catch { /* first run */ }
  const merged = { ...DEFAULT_CONFIG, ...saved };
  if (!Array.isArray(merged.petSources)) merged.petSources = [];
  // 永遠包含 app 自己的 pets 資料夾（就算專案搬家了也找得到）
  const ownPets = path.join(APP_DIR, "pets");
  merged.petSources = [ownPets, ...merged.petSources.filter((p) => typeof p === "string" && path.resolve(p) !== ownPets && fs.existsSync(p))];
  if (!merged.petSources.includes(DEFAULT_CONFIG.petSources[1]) && fs.existsSync(DEFAULT_CONFIG.petSources[1])) merged.petSources.push(DEFAULT_CONFIG.petSources[1]);
  if (!SCALES.includes(Number(merged.scale))) merged.scale = 1;
  merged.scale = Number(merged.scale);
  return merged;
}

function saveConfig() {
  try {
    fs.mkdirSync(CONFIG_DIR, { recursive: true });
    fs.writeFileSync(CONFIG_PATH, `${JSON.stringify(config, null, 2)}\n`, "utf8");
  } catch (err) {
    console.error("saveConfig failed:", err);
  }
}

function appendLog(line) {
  try {
    fs.mkdirSync(CONFIG_DIR, { recursive: true });
    try { if (fs.statSync(LOG_PATH).size > 2 * 1024 * 1024) fs.truncateSync(LOG_PATH, 0); } catch { /* no file yet */ }
    fs.appendFileSync(LOG_PATH, `${new Date().toISOString()} ${line}\n`, "utf8");
  } catch { /* ignore */ }
}

// ---------- pets ----------

function discoverPets() {
  const found = [];
  const seen = new Set();
  for (const src of config.petSources) {
    let entries = [];
    try { entries = fs.readdirSync(src, { withFileTypes: true }); } catch { continue; }
    for (const ent of entries) {
      if (!ent.isDirectory()) continue;
      const dir = path.join(src, ent.name);
      let manifest;
      try { manifest = JSON.parse(fs.readFileSync(path.join(dir, "pet.json"), "utf8")); } catch { continue; }
      const id = String(manifest.id || ent.name);
      if (seen.has(id)) continue;
      const spritesheetPath = path.join(dir, manifest.spritesheetPath || "spritesheet.webp");
      if (!fs.existsSync(spritesheetPath)) continue;
      seen.add(id);
      found.push({
        id,
        displayName: manifest.displayName || id,
        description: manifest.description || "",
        dir,
        spritesheetPath,
        version: Number(manifest.spriteVersionNumber) === 2 ? 2 : 1,
      });
    }
  }
  return found;
}

function activePet() {
  return pets.find((p) => p.id === config.activePetId) || pets[0] || null;
}

function petPayload(pet) {
  if (!pet) return null;
  const ext = path.extname(pet.spritesheetPath).toLowerCase();
  const mime = ext === ".png" ? "image/png" : "image/webp";
  const data = fs.readFileSync(pet.spritesheetPath).toString("base64");
  return {
    id: pet.id,
    displayName: pet.displayName,
    description: pet.description,
    version: pet.version,
    dataUrl: `data:${mime};base64,${data}`,
  };
}

// ---------- window ----------

function windowSizeFor(scale) {
  return {
    width: Math.round(CELL_W * scale) + PAD_X * 2,
    height: Math.round(CELL_H * scale) + BUBBLE_H + PAD_BOTTOM,
  };
}

function defaultPosition(size) {
  const { workArea } = screen.getPrimaryDisplay();
  return {
    x: workArea.x + workArea.width - size.width - 24,
    y: workArea.y + workArea.height - size.height - 4,
  };
}

function clampToDisplays(pos, size) {
  const display = screen.getDisplayMatching({ x: pos.x, y: pos.y, width: size.width, height: size.height });
  const wa = display.workArea;
  return {
    x: Math.round(Math.min(Math.max(pos.x, wa.x - size.width + 48), wa.x + wa.width - 48)),
    y: Math.round(Math.min(Math.max(pos.y, wa.y - 16), wa.y + wa.height - 48)),
  };
}

function createWindow() {
  const size = windowSizeFor(config.scale);
  const pos = clampToDisplays(config.position || defaultPosition(size), size);
  win = new BrowserWindow({
    x: pos.x,
    y: pos.y,
    width: size.width,
    height: size.height,
    transparent: true,
    frame: false,
    alwaysOnTop: config.alwaysOnTop,
    skipTaskbar: true,
    resizable: false,
    movable: false,
    minimizable: false,
    maximizable: false,
    fullscreenable: false,
    hasShadow: false,
    focusable: false,
    show: false,
    title: "Claude Pet",
    webPreferences: {
      preload: path.join(APP_DIR, "preload.js"),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: true,
      backgroundThrottling: false,
    },
  });
  win.setMenu(null);
  if (config.alwaysOnTop) win.setAlwaysOnTop(true, "screen-saver");
  win.setIgnoreMouseEvents(true, { forward: true });
  win.loadFile(path.join(APP_DIR, "renderer", "index.html"));
  win.once("ready-to-show", () => win.showInactive());
  win.on("closed", () => { win = null; });
}

function send(channel, data) {
  if (win && !win.isDestroyed()) win.webContents.send(channel, data);
}

function sendInit() {
  send("pet:init", {
    pet: petPayload(activePet()),
    scale: config.scale,
    followCursor: config.followCursor,
  });
}

// ---------- drag ----------

function startDrag(offsetX, offsetY) {
  if (!win) return;
  endDrag(false);
  let last = screen.getCursorScreenPoint();
  let lastDx = 0;
  const startedAt = Date.now();
  dragTimer = setInterval(() => {
    if (!win || Date.now() - startedAt > 60000) return endDrag(true);
    const p = screen.getCursorScreenPoint();
    const dx = p.x - last.x;
    last = p;
    if (Math.abs(dx) >= 1) lastDx = dx;
    win.setPosition(Math.round(p.x - offsetX), Math.round(p.y - offsetY), false);
    send("pet:drag-move", { dx: lastDx });
  }, 16);
}

function endDrag(save) {
  if (dragTimer) {
    clearInterval(dragTimer);
    dragTimer = null;
  }
  if (save && win) {
    const [x, y] = win.getPosition();
    config.position = { x, y };
    saveConfig();
  }
}

// ---------- cursor look ----------

function startCursorPolling() {
  cursorTimer = setInterval(() => {
    if (!win || !config.followCursor || dragTimer) return;
    const p = screen.getCursorScreenPoint();
    if (p.x === lastCursor.x && p.y === lastCursor.y) return;
    lastCursor = p;
    const b = win.getBounds();
    const cx = b.x + b.width / 2;
    const cy = b.y + BUBBLE_H + CELL_H * config.scale * 0.3; // 大約頭部的高度
    send("pet:cursor", { dx: p.x - cx, dy: p.y - cy });
  }, 50);
}

// ---------- HTTP：接收 Claude Code hook ----------

function startServer() {
  const server = http.createServer((req, res) => {
    if (req.method === "POST" && req.url === "/event") {
      let body = "";
      req.on("data", (chunk) => {
        body += chunk;
        if (body.length > 65536) req.destroy();
      });
      req.on("end", () => {
        let payload = null;
        try { payload = JSON.parse(body || "{}"); } catch { /* bad json */ }
        if (payload && typeof payload === "object") {
          appendLog(JSON.stringify(payload));
          send("pet:event", payload);
          res.writeHead(204);
        } else {
          res.writeHead(400);
        }
        res.end();
      });
      return;
    }
    if (req.method === "GET" && req.url === "/state") {
      res.writeHead(200, { "content-type": "application/json; charset=utf-8" });
      res.end(JSON.stringify({ ...currentState, pet: activePet()?.id || null, scale: config.scale }));
      return;
    }
    if (req.method === "GET" && req.url === "/health") {
      res.writeHead(200, { "content-type": "text/plain" });
      res.end("ok");
      return;
    }
    res.writeHead(404);
    res.end();
  });
  server.on("error", (err) => {
    dialog.showErrorBox("Claude Pet", `無法監聽 127.0.0.1:${config.port}\n${err.message}\n\n是不是已經有一隻在跑了？`);
  });
  server.listen(config.port, "127.0.0.1");
}

// ---------- tray / menu ----------

function fallbackTrayIcon() {
  const size = 16;
  const buf = Buffer.alloc(size * size * 4);
  for (let y = 0; y < size; y++) {
    for (let x = 0; x < size; x++) {
      const dx = x - 7.5;
      const dy = y - 7.5;
      const inside = dx * dx + dy * dy <= 6.5 * 6.5;
      const i = (y * size + x) * 4;
      buf[i] = 0x4a; buf[i + 1] = 0x7c; buf[i + 2] = 0xff; buf[i + 3] = inside ? 255 : 0; // BGRA
    }
  }
  return nativeImage.createFromBitmap(buf, { width: size, height: size });
}

function createTray() {
  tray = new Tray(fallbackTrayIcon());
  tray.setToolTip("Claude Pet");
  tray.on("click", () => tray.popUpContextMenu(buildMenu()));
  refreshTray();
}

function refreshTray() {
  if (!tray) return;
  tray.setContextMenu(buildMenu());
  const pet = activePet();
  tray.setToolTip(`Claude Pet – ${pet ? pet.displayName : "無寵物"}\n狀態：${currentState.anim}（${currentState.sessions} 個 session）`);
}

function runSafely(fn) {
  try { fn(); } catch (err) { dialog.showErrorBox("Claude Pet", String(err.message || err)); }
  refreshTray();
}

function info(message) {
  dialog.showMessageBox({ type: "info", title: "Claude Pet", message, buttons: ["OK"] });
}

function buildMenu() {
  const pet = activePet();
  const TESTS = [
    ["idle", "待機"], ["running", "工作中"], ["waiting", "等待授權"], ["review", "檢視成果"],
    ["failed", "失敗"], ["jumping", "跳躍（完成）"], ["waving", "揮手"],
  ];
  return Menu.buildFromTemplate([
    { label: pet ? `${pet.displayName}（${pet.id}）` : "沒有可用的寵物", enabled: false },
    { type: "separator" },
    {
      label: "切換寵物",
      submenu: [
        ...pets.map((p) => ({
          label: `${p.displayName}${p.version === 2 ? "" : "（v1，無追視）"}`,
          type: "radio",
          checked: p.id === pet?.id,
          click: () => switchPet(p.id),
        })),
        { type: "separator" },
        { label: "重新掃描", click: () => { pets = discoverPets(); if (!activePet()) return; refreshTray(); } },
        { label: "開啟寵物資料夾", click: () => shell.openPath(path.join(APP_DIR, "pets")) },
      ],
    },
    {
      label: "大小",
      submenu: SCALES.map((s) => ({
        label: `${Math.round(s * 100)}%`,
        type: "radio",
        checked: s === config.scale,
        click: () => setScale(s),
      })),
    },
    {
      label: "跟著游標看",
      type: "checkbox",
      checked: config.followCursor,
      click: (item) => {
        config.followCursor = item.checked;
        saveConfig();
        send("pet:settings", { followCursor: config.followCursor });
      },
    },
    {
      label: "永遠置頂",
      type: "checkbox",
      checked: config.alwaysOnTop,
      click: (item) => {
        config.alwaysOnTop = item.checked;
        saveConfig();
        win?.setAlwaysOnTop(item.checked, "screen-saver");
      },
    },
    {
      label: "開機自動啟動",
      type: "checkbox",
      checked: autostart.isInstalled(),
      click: (item) => runSafely(() => (item.checked ? autostart.install() : autostart.uninstall())),
    },
    { type: "separator" },
    {
      label: "動作測試",
      submenu: [
        ...TESTS.map(([anim, label]) => ({ label, click: () => send("pet:event", { event: "__test", anim }) })),
        { type: "separator" },
        { label: "清除測試狀態", click: () => send("pet:event", { event: "__test", anim: "clear" }) },
      ],
    },
    {
      label: "Claude Code hooks",
      submenu: [
        {
          label: hooksInstaller.isInstalled() ? "已安裝 ✓（重新安裝）" : "安裝到 ~/.claude/settings.json",
          click: () => runSafely(() => {
            const r = hooksInstaller.install();
            info(`已安裝 ${r.events.length} 個 hook 事件。\n\n已開啟的 Claude Code session 要重新啟動才會生效。`);
          }),
        },
        {
          label: "移除",
          enabled: hooksInstaller.isInstalled(),
          click: () => runSafely(() => {
            const r = hooksInstaller.uninstall();
            info(`已移除 ${r.removed} 個 hook。`);
          }),
        },
      ],
    },
    { label: "回到預設位置", click: resetPosition },
    { label: "開啟設定檔", click: () => { saveConfig(); shell.openPath(CONFIG_PATH); } },
    { label: "開啟事件紀錄", click: () => { appendLog("open log"); shell.openPath(LOG_PATH); } },
    { type: "separator" },
    { label: "結束", click: () => app.quit() },
  ]);
}

function switchPet(id) {
  if (!pets.some((p) => p.id === id)) return;
  config.activePetId = id;
  saveConfig();
  send("pet:load", { pet: petPayload(activePet()) });
  refreshTray();
}

function setScale(scale) {
  if (!win) return;
  const b = win.getBounds();
  const size = windowSizeFor(scale);
  const x = Math.round(b.x + (b.width - size.width) / 2);
  const y = Math.round(b.y + (b.height - size.height));
  win.setBounds({ x, y, width: size.width, height: size.height }, false);
  config.scale = scale;
  config.position = { x, y };
  saveConfig();
  send("pet:scale", { scale });
  refreshTray();
}

function resetPosition() {
  if (!win) return;
  const pos = defaultPosition(windowSizeFor(config.scale));
  win.setPosition(pos.x, pos.y, false);
  config.position = null;
  saveConfig();
}

// ---------- IPC ----------

ipcMain.on("pet:ready", () => sendInit());
ipcMain.on("pet:ignore-mouse", (_e, ignore) => win?.setIgnoreMouseEvents(!!ignore, { forward: true }));
ipcMain.on("pet:drag-start", (_e, { offsetX, offsetY }) => startDrag(Number(offsetX) || 0, Number(offsetY) || 0));
ipcMain.on("pet:drag-end", () => endDrag(true));
ipcMain.on("pet:context-menu", () => buildMenu().popup({ window: win }));
ipcMain.on("pet:tray-icon", (_e, dataUrl) => {
  try { tray?.setImage(nativeImage.createFromDataURL(dataUrl)); } catch (err) { console.error(err); }
});
ipcMain.on("pet:state", (_e, state) => {
  currentState = { ...currentState, ...state };
  refreshTray();
});
ipcMain.on("pet:log", (_e, line) => appendLog(String(line)));

// ---------- app ----------

app.setAppUserModelId("com.jianmiau.claude-pet");

if (!app.requestSingleInstanceLock()) {
  app.quit();
} else {
  app.on("second-instance", () => {
    if (win) win.showInactive();
  });

  app.whenReady().then(() => {
    pets = discoverPets();
    if (pets.length === 0) {
      dialog.showErrorBox("Claude Pet", `找不到任何寵物。\n請把 Codex 寵物包（pet.json + spritesheet.webp）放到：\n${config.petSources.join("\n")}`);
    }
    createWindow();
    createTray();
    startServer();
    startCursorPolling();
    appendLog(`started pet=${activePet()?.id || "none"} scale=${config.scale} port=${config.port}`);
  });

  app.on("window-all-closed", () => {
    // 留在系統匣，不結束
  });

  app.on("before-quit", () => {
    if (cursorTimer) clearInterval(cursorTimer);
    endDrag(false);
  });
}