import { ipcMain, WebContents } from "electron";
import { spawn, ChildProcess, exec } from "node:child_process";
import { promisify } from "node:util";
import fs from "node:fs";
import path from "node:path";
import pino from "pino";

import { ChannelPayload, InstalledAppInfo } from "../../typedefinition";
import axios from "axios";

const logger = pino({ name: "install-manager" });

type InstallTask = {
  id: number;
  pkgname: string;
  execCommand: string;
  execParams: string[];
  download_process: ChildProcess | null;
  install_process: ChildProcess | null;
  webContents: WebContents | null;
  downloadDir?: string;
  metalinkUrl?: string;
  filename?: string;
};

const SHELL_CALLER_PATH = "/opt/spark-store/extras/shell-caller.sh";

export const tasks = new Map<number, InstallTask>();

let idle = true; // Indicates if the installation manager is idle

const checkSuperUserCommand = async (): Promise<string> => {
  let superUserCmd = "";
  const execAsync = promisify(exec);
  if (process.getuid && process.getuid() !== 0) {
    const { stdout, stderr } = await execAsync("which /usr/bin/pkexec");
    if (stderr) {
      logger.error("没有找到 pkexec 命令");
      return;
    }
    logger.info(`找到提升权限命令: ${stdout.trim()}`);
    superUserCmd = stdout.trim();

    if (superUserCmd.length === 0) {
      logger.error("没有找到提升权限的命令 pkexec!");
    }
  }
  return superUserCmd;
};

const runCommandCapture = async (execCommand: string, execParams: string[]) => {
  return await new Promise<{ code: number; stdout: string; stderr: string }>(
    (resolve) => {
      const child = spawn(execCommand, execParams, {
        shell: true,
        env: process.env,
      });

      let stdout = "";
      let stderr = "";

      child.stdout?.on("data", (data) => {
        stdout += data.toString();
      });

      child.stderr?.on("data", (data) => {
        stderr += data.toString();
      });

      child.on("error", (err) => {
        resolve({ code: -1, stdout, stderr: err.message });
      });

      child.on("close", (code) => {
        resolve({ code: typeof code === "number" ? code : -1, stdout, stderr });
      });
    },
  );
};

const parseInstalledList = (output: string) => {
  const apps: Array<InstalledAppInfo> = [];
  const lines = output.split("\n");
  for (const line of lines) {
    const trimmed = line.trim();
    if (!trimmed) continue;
    if (trimmed.startsWith("Listing")) continue;
    if (trimmed.startsWith("[INFO]")) continue;

    const match = trimmed.match(/^(\S+)\/\S+,\S+\s+(\S+)\s+(\S+)\s+\[(.+)\]$/);
    if (!match) continue;
    apps.push({
      pkgname: match[1],
      version: match[2],
      arch: match[3],
      flags: match[4],
      raw: trimmed,
    });
  }
  return apps;
};

const parseUpgradableList = (output: string) => {
  const apps: Array<{
    pkgname: string;
    newVersion: string;
    currentVersion: string;
    raw: string;
  }> = [];
  const lines = output.split("\n");
  for (const line of lines) {
    const trimmed = line.trim();
    if (!trimmed) continue;
    if (trimmed.startsWith("Listing")) continue;
    if (trimmed.startsWith("[INFO]")) continue;
    if (trimmed.includes("=") && !trimmed.includes("/")) continue;

    if (!trimmed.includes("/")) continue;

    const tokens = trimmed.split(/\s+/);
    if (tokens.length < 2) continue;
    const pkgToken = tokens[0];
    const pkgname = pkgToken.split("/")[0];
    const newVersion = tokens[1] || "";
    const currentMatch = trimmed.match(
      /\[(?:upgradable from|from):\s*([^\]\s]+)\]/i,
    );
    const currentToken = tokens[5] || "";
    const currentVersion =
      currentMatch?.[1] || currentToken.replace("[", "").replace("]", "");

    if (!pkgname) continue;
    apps.push({ pkgname, newVersion, currentVersion, raw: trimmed });
  }
  return apps;
};

// Listen for download requests from renderer process
ipcMain.on("queue-install", async (event, download_json) => {
  const download = JSON.parse(download_json);
  const { id, pkgname, metalinkUrl, filename } = download || {};

  if (!id || !pkgname) {
    logger.warn("passed arguments missing id or pkgname");
    return;
  }

  logger.info(`收到下载任务: ${id},  软件包名称: ${pkgname}`);

  // 避免重复添加同一任务，但允许重试下载
  if (tasks.has(id) && !download.retry) {
    tasks.get(id)?.webContents.send("install-log", {
      id,
      time: Date.now(),
      message: `任务id： ${id} 已在列表中，忽略重复添加`,
    });
    tasks.get(id)?.webContents.send("install-complete", {
      id: id,
      success: false,
      time: Date.now(),
      exitCode: -1,
      message: `{"message":"任务id： ${id} 已在列表中，忽略重复添加","stdout":"","stderr":""}`,
    });
    return;
  }

  const webContents = event.sender;

  // 开始组装安装命令
  const superUserCmd = await checkSuperUserCommand();
  let execCommand = "";
  const execParams = [];
  const downloadDir = `/tmp/spark-store/download/${pkgname}`;

  if (superUserCmd.length > 0) {
    execCommand = superUserCmd;
    execParams.push(SHELL_CALLER_PATH);
  } else {
    execCommand = SHELL_CALLER_PATH;
  }

  if (metalinkUrl && filename) {
    execParams.push("ssinstall", `${downloadDir}/${filename}` , "--delete-after-install");
  } else {
    execParams.push("aptss", "install", "-y", pkgname);
  }

  const task: InstallTask = {
    id,
    pkgname,
    execCommand,
    execParams,
    download_process: null,
    install_process: null,
    webContents,
    downloadDir,
    metalinkUrl,
    filename,
  };
  tasks.set(id, task);
  if (idle) processNextInQueue();
});

// Cancel Handler
ipcMain.on("cancel-install", (event, id) => {
  if (tasks.has(id)) {
    const task = tasks.get(id);
    if (task) {
      task.download_process?.kill(); // Kill the download process
      task.install_process?.kill(); // Kill the install process
      logger.info(`已取消任务: ${id}`);
    }
    // Note: 'close' handler usually handles cleanup
  }
});

async function processNextInQueue() {
  if (!idle) return;

  // Always take the first task to ensure sequence
  const task = Array.from(tasks.values())[0];
  if (!task) {
    idle = true;
    return;
  }

  idle = false;
  const { webContents, id, downloadDir } = task;

  const sendLog = (msg: string) => {
    webContents?.send("install-log", { id, time: Date.now(), message: msg });
  };
  const sendStatus = (status: string) => {
    webContents?.send("install-status", {
      id,
      time: Date.now(),
      message: status,
    });
  };

  try {
    // 1. Metalink & Aria2c Phase
    if (task.metalinkUrl) {
      try {
        if (!fs.existsSync(downloadDir)) {
          fs.mkdirSync(downloadDir, { recursive: true });
        }
      } catch (err) {
        logger.error(`无法创建目录 ${downloadDir}: ${err}`);
        throw err;
      }

      const metalinkPath = path.join(downloadDir, `${task.filename}.metalink`);

      sendLog(`正在获取 Metalink 文件: ${task.metalinkUrl}`);

      const response = await axios.get(task.metalinkUrl, {
        baseURL: "https://erotica.spark-app.store",
        responseType: "stream",
      });

      const writer = fs.createWriteStream(metalinkPath);
      response.data.pipe(writer);

      await new Promise<void>((resolve, reject) => {
        writer.on("finish", resolve);
        writer.on("error", reject);
      });

      sendLog("Metalink 文件下载完成");

      // Aria2c
      const aria2Args = [
        `--dir=${downloadDir}`,
        "--allow-overwrite=true",
        "--summary-interval=1",
        "-M",
        metalinkPath,
      ];

      sendStatus("downloading");
      sendLog(`启动下载: aria2c ${aria2Args.join(" ")}`);

      await new Promise<void>((resolve, reject) => {
        const child = spawn("aria2c", aria2Args);
        task.download_process = child;

        child.stdout.on("data", (data) => {
          const str = data.toString();
          // Match ( 12%) or (12%)
          const match = str.match(/[0-9]+(\.[0-9]+)?%/g);
          if (match) {
            const p = parseFloat(match.at(-1)) / 100;
            webContents?.send("install-progress", { id, progress: p });
          }
        });
        child.stderr.on("data", (d) => sendLog(`aria2c: ${d}`));

        child.on("close", (code) => {
          if (code === 0) {
            webContents?.send("install-progress", { id, progress: 1 });
            resolve();
          } else {
            reject(new Error(`Aria2c exited with code ${code}`));
          }
        });
        child.on("error", reject);
      });
    }

    // 2. Install Phase
    sendStatus("installing");

    const cmdString = `${task.execCommand} ${task.execParams.join(" ")}`;
    sendLog(`执行安装: ${cmdString}`);
    logger.info(`启动安装: ${cmdString}`);

    const result = await new Promise<{
      code: number;
      stdout: string;
      stderr: string;
    }>((resolve, reject) => {
      const child = spawn(task.execCommand, task.execParams, {
        shell: true,
        env: process.env,
      });
      task.install_process = child;

      let stdout = "";
      let stderr = "";

      child.stdout.on("data", (d) => {
        const s = d.toString();
        stdout += s;
        sendLog(s);
      });

      child.stderr.on("data", (d) => {
        const s = d.toString();
        stderr += s;
        sendLog(s);
      });

      child.on("close", (code) => {
        resolve({ code: code ?? -1, stdout, stderr });
      });
      child.on("error", (err) => {
        reject(err);
      });
    });

    // Completion
    const success = result.code === 0;
    const msgObj = {
      message: success ? "安装完成" : `安装失败，退出码 ${result.code}`,
      stdout: result.stdout,
      stderr: result.stderr,
    };

    if (success) logger.info(msgObj);
    else logger.error(msgObj);

    webContents?.send("install-complete", {
      id,
      success,
      time: Date.now(),
      exitCode: result.code,
      message: JSON.stringify(msgObj),
    });
  } catch (error) {
    logger.error(`Task ${id} failed: ${error}`);
    webContents?.send("install-complete", {
      id,
      success: false,
      time: Date.now(),
      exitCode: -1,
      message: JSON.stringify({
        message: error instanceof Error ? error.message : String(error),
        stdout: "",
        stderr: "",
      }),
    });
  } finally {
    tasks.delete(id);
    idle = true;
    // Trigger next
    if (tasks.size > 0) {
      processNextInQueue();
    }
  }
}

ipcMain.handle("check-installed", async (_event, pkgname: string) => {
  if (!pkgname) {
    logger.warn("check-installed missing pkgname");
    return false;
  }

  logger.info(`检查应用是否已安装: ${pkgname}`);

  const checkScript = "/opt/spark-store/extras/check-is-installed";
  let isInstalled = false;

  const child = spawn(checkScript, [pkgname], {
    shell: false,
    env: process.env,
  });

  await new Promise<void>((resolve) => {
    child.on("error", (err) => {
      logger.error(`check-installed 执行失败: ${err?.message || err}`);
      resolve();
    });

    child.on("close", (code) => {
      if (code === 0) {
        isInstalled = true;
        logger.info(`应用已安装: ${pkgname}`);
      } else {
        logger.info(`应用未安装: ${pkgname} (exit ${code})`);
      }
      resolve();
    });
  });

  return isInstalled;
});

ipcMain.on("remove-installed", async (_event, pkgname: string) => {
  const webContents = _event.sender;
  if (!pkgname) {
    logger.warn("remove-installed missing pkgname");
    return;
  }
  logger.info(`卸载已安装应用: ${pkgname}`);

  const superUserCmd = await checkSuperUserCommand();
  let execCommand = "";
  const execParams = [];
  if (superUserCmd.length > 0) {
    execCommand = superUserCmd;
    execParams.push(SHELL_CALLER_PATH);
  } else {
    execCommand = SHELL_CALLER_PATH;
  }
  const child = spawn(
    execCommand,
    [...execParams, "aptss", "remove", pkgname ],
    {
      shell: true,
      env: process.env,
    },
  );
  let output = "";

  child.stdout.on("data", (data) => {
    const chunk = data.toString();
    output += chunk;
    webContents.send("remove-progress", chunk);
  });

  child.on("close", (code) => {
    const success = code === 0;
    // 拼接json消息
    const messageJSONObj = {
      message: success ? "卸载完成" : `卸载失败，退出码 ${code}`,
      stdout: output,
      stderr: "",
    };

    if (success) {
      logger.info(messageJSONObj);
    } else {
      logger.error(messageJSONObj);
    }

    webContents.send("remove-complete", {
      id: 0,
      success: success,
      time: Date.now(),
      exitCode: code,
      message: JSON.stringify(messageJSONObj),
    } satisfies ChannelPayload);
  });
});

ipcMain.handle("list-upgradable", async () => {
  const { code, stdout, stderr } = await runCommandCapture(SHELL_CALLER_PATH, [
    "aptss",
    "list",
    "--upgradable",
  ]);
  if (code !== 0) {
    logger.error(`list-upgradable failed: ${stderr || stdout}`);
    return {
      success: false,
      message: stderr || stdout || `list-upgradable failed with code ${code}`,
      apps: [],
    };
  }

  const apps = parseUpgradableList(stdout);
  return { success: true, apps };
});

ipcMain.handle("list-installed", async () => {
  const superUserCmd = await checkSuperUserCommand();
  const execCommand =
    superUserCmd.length > 0 ? superUserCmd : SHELL_CALLER_PATH;
  const execParams =
    superUserCmd.length > 0
      ? [SHELL_CALLER_PATH, "aptss", "list", "--installed"]
      : ["aptss", "list", "--installed"];

  const { code, stdout, stderr } = await runCommandCapture(
    execCommand,
    execParams,
  );
  if (code !== 0) {
    logger.error(`list-installed failed: ${stderr || stdout}`);
    return {
      success: false,
      message: stderr || stdout || `list-installed failed with code ${code}`,
      apps: [],
    };
  }

  const apps = parseInstalledList(stdout);
  return { success: true, apps };
});

ipcMain.handle("uninstall-installed", async (_event, pkgname: string) => {
  if (!pkgname) {
    logger.warn("uninstall-installed missing pkgname");
    return { success: false, message: "missing pkgname" };
  }

  const superUserCmd = await checkSuperUserCommand();
  const execCommand =
    superUserCmd.length > 0 ? superUserCmd : SHELL_CALLER_PATH;
  const execParams =
    superUserCmd.length > 0
      ? [SHELL_CALLER_PATH, "aptss", "remove", "-y", pkgname]
      : ["aptss", "remove", "-y", pkgname];

  const { code, stdout, stderr } = await runCommandCapture(
    execCommand,
    execParams,
  );
  const success = code === 0;

  if (success) {
    logger.info(`卸载完成: ${pkgname}`);
  } else {
    logger.error(`卸载失败: ${pkgname} ${stderr || stdout}`);
  }

  return {
    success,
    message: success
      ? "卸载完成"
      : stderr || stdout || `卸载失败，退出码 ${code}`,
  };
});

ipcMain.handle("launch-app", async (_event, pkgname: string) => {
  if (!pkgname) {
    logger.warn("No pkgname provided for launch-app");
  }

  const execCommand = "/opt/spark-store/extras/host-spawn";
  const execParams = ["/opt/spark-store/extras/app-launcher", "launch", pkgname];

  logger.info(
    `Launching app: ${pkgname} with command: ${execCommand} ${execParams.join(" ")}`,
  );

  spawn(execCommand, execParams, {
    shell: false,
    env: process.env,
    detached: true,
    stdio: "ignore",
  }).unref();
});