import type { ApiRequest, ApiResponse } from '../_lib/types.js'
import { cors, withTelegramAuth } from '../_lib/auth.js'
import { findUserByTelegramId, pool } from '../_lib/db.js'

async function handler(req: ApiRequest, res: ApiResponse) {
  cors(req, res)

  if (req.method === 'OPTIONS') {
    return res.status(200).end()
  }

  if (req.method !== 'GET') {
    return res.status(405).json({ error: 'Method not allowed' })
  }

  const telegramUser = req.telegramUser
  if (!telegramUser) {
    return res.status(401).json({ error: 'Not authenticated' })
  }

  const user = await findUserByTelegramId(telegramUser.id)
  if (!user) {
    return res.status(404).json({ error: 'User not found' })
  }

  const questId = req.query.id as string | undefined

  if (questId) {
    // Get specific quest with days and points
    const { rows: quests } = await pool.query(
      `SELECT q.*, c.name as city_name, c.country as city_country
       FROM quests q
       JOIN cities c ON q.city_id = c.id
       WHERE q.id = $1 AND q.user_id = $2`,
      [questId, user.id]
    )

    if (quests.length === 0) {
      return res.status(404).json({ error: 'Quest not found' })
    }

    const { rows: days } = await pool.query(
      `SELECT d.*,
         COALESCE(
           json_agg(
             jsonb_build_object(
               'id', p.id, 'title', p.title, 'teaser_text', p.teaser_text,
               'content_text', p.content_text, 'status', p.status,
               'order_in_day', p.order_in_day, 'location_lat', p.location_lat,
               'location_lon', p.location_lon
             ) ORDER BY p.order_in_day
           ) FILTER (WHERE p.id IS NOT NULL),
           '[]'::json
         ) as points
       FROM quest_days d
       LEFT JOIN quest_points p ON d.id = p.day_id
       WHERE d.quest_id = $1
       GROUP BY d.id
       ORDER BY d.day_number`,
      [questId]
    )

    return res.json({ quest: quests[0], days })
  }

  // List all completed quests
  const { rows: quests } = await pool.query(
    `SELECT q.*, c.name as city_name, c.country as city_country
     FROM quests q
     JOIN cities c ON q.city_id = c.id
     WHERE q.user_id = $1 AND q.status = 'completed'
     ORDER BY q.completed_at DESC`,
    [user.id]
  )

  return res.json({ quests })
}

export default withTelegramAuth(handler)