'use strict';

const fs = require('fs');
const path = require('path');
const mime = require('mime-types');
const { getContainerContext, resolveContainerPath } = require('./container_bridge');

function resolvePath(workspace, p) {
  if (path.isAbsolute(p)) return p;
  return path.join(workspace, p);
}

function readMediafileTool(workspace, args) {
  const ctx = getContainerContext();
  let target = resolvePath(workspace, args.path);
  let displayPath = target;
  if (ctx) {
    const resolved = resolveContainerPath(workspace, args.path || '.', ctx);
    if (resolved.error) return { success: false, error: resolved.error };
    target = resolved.hostPath;
    displayPath = resolved.containerPath;
  }
  try {
    const stat = fs.statSync(target);
    if (!stat.isFile()) return { success: false, error: '不是文件' };
    const mt = mime.lookup(target);
    if (!mt) return { success: false, error: '无法识别文件类型' };
    if (!mt.startsWith('image/') && !mt.startsWith('video/')) {
      return { success: false, error: '禁止的文件类型' };
    }
    const data = fs.readFileSync(target);
    const b64 = data.toString('base64');
    const type = mt.startsWith('image/') ? 'image' : 'video';
    return { success: true, path: displayPath, mime: mt, type, b64 };
  } catch (err) {
    return { success: false, error: err.message || String(err) };
  }
}

module.exports = { readMediafileTool };