/**
 * daily-briefing skill
 * 生成每日早安簡報
 */

import { readFileSync, existsSync } from 'fs';
import { join } from 'path';

function getWeekday(date: Date): string {
  const days = ['日', '一', '二', '三', '四', '五', '六'];
  return `週${days[date.getDay()]}`;
}

function formatDate(date: Date): string {
  const y = date.getFullYear();
  const m = String(date.getMonth() + 1).padStart(2, '0');
  const d = String(date.getDate()).padStart(2, '0');
  return `${y}-${m}-${d}`;
}

async function fetchWeather(city: string, apiKey?: string): Promise<string> {
  if (!apiKey) {
    // 無 API key，使用 web_search 取得天氣資訊
    return '（天氣資訊需設定 OpenWeatherMap API Key，或由 agent 透過 web_search 查詢）';
  }
  try {
    const url = `https://api.openweathermap.org/data/2.5/weather?q=${encodeURIComponent(city)}&appid=${apiKey}&units=metric&lang=zh_tw`;
    const res = await fetch(url);
    const data = await res.json() as any;
    if (data.main) {
      const temp = `${Math.round(data.main.temp_min)}-${Math.round(data.main.temp_max)}°C`;
      const desc = data.weather?.[0]?.description || '';
      return `氣溫 ${temp}，${desc}`;
    }
  } catch {
    // ignore
  }
  return '天氣資訊暫時無法取得';
}

function readWorkspaceFile(workspace: string, filename: string): string {
  const path = join(workspace, filename);
  if (existsSync(path)) {
    return readFileSync(path, 'utf-8');
  }
  return '';
}

function parseTodos(todoContent: string): string[] {
  if (!todoContent) return [];
  return todoContent
    .split('\n')
    .filter(line => line.match(/^[-*]\s*\[\s*\]/))
    .map(line => line.replace(/^[-*]\s*/, ''))
    .slice(0, 10);
}

function parseTodaySchedule(scheduleContent: string, dateStr: string): string[] {
  if (!scheduleContent) return [];
  const lines = scheduleContent.split('\n');
  const results: string[] = [];
  let inToday = false;

  for (const line of lines) {
    if (line.includes(dateStr)) { inToday = true; continue; }
    if (inToday && line.match(/^#{1,3}\s/)) break;
    if (inToday && line.trim() && line.match(/^\d{2}:\d{2}/)) {
      results.push(line.trim());
    }
  }
  return results;
}

export async function handler(ctx: any) {
  const workspace = ctx.env?.OPENCLAW_WORKSPACE || process.env.HOME + '/.openclaw/workspace';
  const now = new Date();
  const dateStr = formatDate(now);
  const weekday = getWeekday(now);

  // 讀取設定
  const userMd = readWorkspaceFile(workspace, 'USER.md');
  const cityMatch = userMd.match(/城市[：:]\s*(.+)/);
  const city = cityMatch?.[1]?.trim() || '台北';
  const apiKeyMatch = userMd.match(/天氣 API Key[：:]\s*(.+)/);
  const weatherApiKey = apiKeyMatch?.[1]?.trim();

  // 讀取待辦與行程
  const todoContent = readWorkspaceFile(workspace, 'TODO.md');
  const scheduleContent = readWorkspaceFile(workspace, 'SCHEDULE.md');
  const memoryContent = readWorkspaceFile(workspace, `memory/${dateStr}.md`);

  const todos = parseTodos(todoContent);
  const schedule = parseTodaySchedule(scheduleContent, dateStr);
  const weatherInfo = await fetchWeather(city, weatherApiKey);

  // 組裝簡報
  const sections: string[] = [];

  sections.push(`☀️ **早安！${dateStr} ${weekday}**\n`);

  sections.push(`🌤️ **今日天氣（${city}）**\n${weatherInfo}`);

  if (schedule.length > 0) {
    sections.push(`📅 **今日行程**\n${schedule.map(s => `• ${s}`).join('\n')}`);
  } else {
    sections.push(`📅 **今日行程**\n• 暫無排程`);
  }

  if (todos.length > 0) {
    sections.push(`✅ **待辦事項（${todos.length} 項）**\n${todos.map(t => `• ${t}`).join('\n')}`);
  } else {
    sections.push(`✅ **待辦事項**\n• 今日無待辦，保持輕鬆！`);
  }

  if (memoryContent) {
    sections.push(`📝 **昨日記錄**\n${memoryContent.slice(0, 200)}...`);
  }

  sections.push(`\n有什麼想先處理的嗎？`);

  return {
    reply: sections.join('\n\n'),
    metadata: { date: dateStr, city, todoCount: todos.length, scheduleCount: schedule.length },
  };
}