import fs from "fs";
import path from "path";
import color from "picocolors";
import { convert } from "./converters.js";
import { runInteractive, showSummary } from "./ui.js";
import { stopKeypress, initKeypress, onKey } from "../keyboard.js";
import { record } from "../stats.js";

const FORMAT_EXT = {
  collada: ".dae", x: ".x", stp: ".stp", obj: ".obj", objnomtl: ".obj",
  stl: ".stl", stlb: ".stl", ply: ".ply", plyb: ".ply", "3ds": ".3ds",
  gltf2: ".gltf", glb2: ".glb", gltf: ".gltf", glb: ".glb",
  assbin: ".assbin", assxml: ".assxml", x3d: ".x3d",
  fbx: ".fbx", fbxa: ".fbx", "3mf": ".3mf", pbrt: ".pbrt", assjson: ".json"
};

function getOutputExt(format) {
  return FORMAT_EXT[format] || "." + format;
}

async function processFile(file, config) {
  const cwd = process.cwd();
  const baseName = file.slice(0, file.lastIndexOf("."));
  const outputExt = getOutputExt(config.outputFormat);
  const outputFile = baseName + outputExt;

  if (!fs.existsSync(path.join(cwd, file))) {
    return { ok: false, file, reason: "文件不存在" };
  }

  await convert(file, outputFile, config.outputFormat, cwd);
  return { ok: true, file, output: outputFile };
}

async function waitForEsc() {
  initKeypress();
  return new Promise(resolve => {
    onKey((str, key) => {
      if (key?.name === "escape" || (key?.ctrl && key?.name === "c")) {
        resolve();
      }
    });
  });
}

export async function run() {
  const result = await runInteractive();
  if (!result) return "back";

  const { steps, results } = result;
  const config = {
    files: results[0] || [],
    outputFormat: results[1] || "glb2"
  };

  stopKeypress();
  showSummary([
    "源文件: " + (config.files.length ? config.files.join(", ") : "未选择"),
    "目标格式: " + config.outputFormat.toUpperCase()
  ]);

  if (!config.files.length) {
    console.log(color.yellow("未选择任何模型文件"));
    console.log(color.dim("\n按 Esc 返回"));
    await waitForEsc();
    return "back";
  }

  const total = config.files.length;
  let success = 0;
  const failed = [];

  console.log(color.cyan(`开始转换 ${total} 个文件...\n`));

  for (let i = 0; i < config.files.length; i++) {
    const file = config.files[i];
    const progress = `[${i + 1}/${total}]`;
    console.log(color.dim(`${progress} 处理中: ${file}`));

    try {
      const result = await processFile(file, config);
      if (result.ok) {
        success++;
        record("convert_format", config.outputFormat);
        console.log(color.green(`${progress} ✓ ${file} → ${path.basename(result.output)}`));
      } else {
        failed.push({ file, reason: result.reason });
        console.log(color.yellow(`${progress} ⊘ 跳过: ${file} (${result.reason})`));
      }
    } catch (err) {
      failed.push({ file, reason: err?.message || String(err) });
      console.log(color.red(`${progress} ✖ 失败: ${file}`));
      console.log(color.dim("   " + String(err?.message || err)));
    }
  }

  console.log("\n" + color.bgGreen(color.black(" 转换完成 ")));
  if (success) {
    console.log(color.green(`成功: ${success} 个`));
  }
  if (failed.length) {
    console.log(color.yellow(`失败: ${failed.length} 个`));
  }

  console.log(color.dim("\n按 Esc 返回"));
  await waitForEsc();
  return "back";
}