"use strict";

/**
 * 调用 bundled Python 封面脚本（对齐 Electron ipAgent:generateVideoCover）
 */
const fs = require("fs");
const path = require("path");
const { spawnSync } = require("child_process");

const pipelineNative = require("./pipeline_native.js");

function locatePython() {
  const env = process.env.AICLIENT_PYTHON_PATH;
  if (env && fs.existsSync(env)) return env;
  return null;
}

function locateCoverScriptsDir() {
  const env = process.env.AICLIENT_COVER_SCRIPTS_DIR;
  if (env && fs.existsSync(path.join(env, "advanced_cover_generator.py"))) {
    return env;
  }
  return null;
}

function normalizePathForPython(filePath) {
  if (process.platform === "win32") {
    return String(filePath).replace(/\\/g, "/");
  }
  return String(filePath);
}

function buildPythonEnv() {
  const env = { ...process.env, PYTHONIOENCODING: "utf-8", PYTHONUTF8: "1" };
  const ffmpeg = pipelineNative.locateFfmpeg();
  if (ffmpeg && fs.existsSync(ffmpeg)) {
    const ffmpegDir = path.dirname(ffmpeg);
    const sep = process.platform === "win32" ? ";" : ":";
    env.PATH = `${ffmpegDir}${sep}${env.PATH || ""}`;
    env.AICLIENT_FFMPEG_PATH = ffmpeg;
  }
  const scriptsDir = locateCoverScriptsDir();
  console.log("scriptsDir", scriptsDir);
  if (scriptsDir) {
    env.AICLIENT_COVER_SCRIPTS_DIR = scriptsDir;
    env.APP_ROOT = path.dirname(scriptsDir);
    const fontsDir = path.join(scriptsDir, "fonts");
    if (fs.existsSync(fontsDir)) {
      env.AICLIENT_COVER_FONTS_DIR = fontsDir;
    }
  }
  return env;
}

/** 与 Electron main 中 isNewTemplate 判定一致 */
function isAdvancedCoverConfig(config) {
  if (!config || typeof config !== "object") return false;
  return (
    config.blurBackground !== undefined ||
    config.extractPerson !== undefined ||
    config.personOutlineColor !== undefined ||
    config.personOutlineWidth !== undefined ||
    config.maskImagePath !== undefined ||
    Boolean(config.titleFontFamily) ||
    config.titleBackgroundEnabled !== undefined ||
    config.personSize !== undefined ||
    config.backgroundBlurEnabled !== undefined
  );
}

/**
 * @param {{ videoPath: string, titleText: string, outputPath: string, config: object, onProgress?: (s: string) => void }} opts
 */
function runAdvancedCoverGenerator(opts) {
  const python = locatePython();
  const scriptsDir = locateCoverScriptsDir();
  if (!python) {
    return { success: false, error: "未找到 Python 运行时，请检查 resources-bundles/python-runtimebackup" };
  }
  if (!scriptsDir) {
    return { success: false, error: "未找到封面脚本目录（cover-python）" };
  }

  const script = path.join(scriptsDir, "advanced_cover_generator.py");
  if (!fs.existsSync(script)) {
    return { success: false, error: `缺少脚本: ${script}` };
  }

  const configJson = JSON.stringify({
    ...opts.config,
    output: opts.outputPath,
    customVideoPath: opts.config.customVideoPath || undefined,
  });

  opts.onProgress?.("正在使用高级封面生成器…");

  const args = [
    script,
    "--video",
    normalizePathForPython(opts.videoPath),
    "--title",
    opts.titleText,
    "--output",
    normalizePathForPython(opts.outputPath),
    "--config",
    configJson,
  ];

  const r = spawnSync(python, args, {
    encoding: "utf8",
    windowsHide: true,
    cwd: scriptsDir,
    env: buildPythonEnv(),
    maxBuffer: 20 * 1024 * 1024,
  });

  if (r.error) {
    return { success: false, error: r.error.message || String(r.error) };
  }

  let previewImages = [];
  const stdout = (r.stdout || "").trim();
  if (stdout) {
    try {
      const lastLine = stdout.split("\n").filter(Boolean).pop();
      const parsed = JSON.parse(lastLine || stdout);
      if (parsed.previewImages) previewImages = parsed.previewImages;
      if (parsed.success === false) {
        return {
          success: false,
          error: parsed.error || parsed.message || "高级封面生成失败",
          stderr: r.stderr,
        };
      }
    } catch {
      /* 非 JSON 时仅检查文件 */
    }
  }

  if (r.status !== 0 || !fs.existsSync(opts.outputPath)) {
    const errMsg =
      (r.stderr || "").trim() ||
      stdout ||
      `Python 退出码 ${r.status ?? "unknown"}`;
    return { success: false, error: errMsg };
  }

  return {
    success: true,
    coverPath: opts.outputPath,
    previewImages,
    message: "高级封面生成完成",
  };
}

/**
 * PIL 中等复杂度封面（cover_generator.py）
 * @param {{ videoPath: string, titleText: string, outputPath: string, config: object, timestamp?: number, onProgress?: (s: string) => void }} opts
 */
function runBasicCoverGenerator(opts) {
  const python = locatePython();
  const scriptsDir = locateCoverScriptsDir();
  if (!python || !scriptsDir) {
    return { success: false, error: "未找到 Python 或封面脚本" };
  }

  const script = path.join(scriptsDir, "cover_generator.py");
  if (!fs.existsSync(script)) {
    return { success: false, error: `缺少脚本: ${script}` };
  }

  opts.onProgress?.("正在使用 PIL 封面生成器…");

  const configJson = JSON.stringify(opts.config || {});
  const args = [
    script,
    "--video",
    normalizePathForPython(opts.videoPath),
    "--title",
    opts.titleText,
    "--output",
    normalizePathForPython(opts.outputPath),
    "--config",
    configJson,
    "--timestamp",
    String(opts.timestamp ?? 3),
  ];

  const r = spawnSync(python, args, {
    encoding: "utf8",
    windowsHide: true,
    cwd: scriptsDir,
    env: buildPythonEnv(),
    maxBuffer: 10 * 1024 * 1024,
  });

  if (r.status === 0 && fs.existsSync(opts.outputPath)) {
    return { success: true, coverPath: opts.outputPath, message: "封面生成完成" };
  }

  return {
    success: false,
    error: (r.stderr || r.stdout || "").trim() || `Python 退出码 ${r.status}`,
  };
}

module.exports = {
  isAdvancedCoverConfig,
  runAdvancedCoverGenerator,
  runBasicCoverGenerator,
  locatePython,
  locateCoverScriptsDir,
};