import type { ApiRequest, ApiResponse } from '../_lib/types.js'
import { withInternalAuth } from '../_lib/auth.js'
import {
  createQuest, createQuestDay, createQuestPoint,
  updateQuestStatus, updateDayStatus, updatePointStatus,
  updatePointContent, markPointArrived,
  getActiveQuestForUser, getActiveDayForQuest,
  getPointsForDay, getFullQuestState,
  saveChatMessage, createAchievement, getUserAchievements,
  findUserByTelegramId,
} from '../_lib/db.js'

async function handler(req: ApiRequest, res: ApiResponse) {
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' })
  }

  const { action, data } = req.body

  try {
    switch (action) {
      case 'create_quest': {
        const quest = await createQuest({
          city_id: data.city_id,
          user_id: data.user_id,
          title: data.title,
          description: data.description,
          number_of_days: data.number_of_days,
          pace: data.pace,
          companions: data.companions,
          user_comment: data.user_comment,
        })

        // Create day skeletons
        const days = []
        for (let i = 1; i <= data.number_of_days; i++) {
          const day = await createQuestDay({
            quest_id: quest.id,
            day_number: i,
            theme: data.day_themes?.[i - 1] || null,
          })
          days.push(day)
        }

        return res.json({ quest, days })
      }

      case 'generate_step': {
        const point = await createQuestPoint({
          day_id: data.day_id,
          title: data.title,
          location_lat: data.location_lat,
          location_lon: data.location_lon,
          teaser_text: data.teaser_text,
          order_in_day: data.order_in_day,
          status: data.status || 'active',
        })
        return res.json({ point })
      }

      case 'update_point_content': {
        const point = await updatePointContent(data.point_id, data.content_text)
        return res.json({ point })
      }

      case 'update_state': {
        let result = null
        if (data.entity === 'quest') {
          result = await updateQuestStatus(data.id, data.status)
        } else if (data.entity === 'day') {
          result = await updateDayStatus(data.id, data.status)
        } else if (data.entity === 'point') {
          result = await updatePointStatus(data.id, data.status)
          if (data.status === 'active' && data.arrived) {
            await markPointArrived(data.id)
          }
        }
        return res.json({ result })
      }

      case 'get_user_state': {
        const user = await findUserByTelegramId(data.telegram_id)
        if (!user) {
          return res.json({ state: null })
        }
        const state = await getFullQuestState(user.id)
        return res.json({ state })
      }

      case 'save_chat_message': {
        const message = await saveChatMessage({
          user_id: data.user_id,
          quest_id: data.quest_id,
          point_id: data.point_id,
          message_type: data.message_type,
          content: data.content,
        })
        return res.json({ message })
      }

      case 'check_achievements': {
        const existing = await getUserAchievements(data.user_id)
        const newAchievements = []

        // First quest completed
        if (!existing.find((a: any) => a.type === 'first_quest')) {
          const ach = await createAchievement({
            user_id: data.user_id,
            type: 'first_quest',
            city_id: data.city_id,
          })
          if (ach) newAchievements.push(ach)
        }

        return res.json({ achievements: newAchievements })
      }

      default:
        return res.status(400).json({ error: `Unknown action: ${action}` })
    }
  } catch (error: any) {
    console.error(`Internal API error (${action}):`, error)
    return res.status(500).json({ error: error.message })
  }
}

export default withInternalAuth(handler)