export const dynamic = 'force-dynamic'
import { NextResponse } from 'next/server'
import { google } from 'googleapis'

export async function GET(req: Request) {
  const { searchParams } = new URL(req.url)
  const range = searchParams.get('range') || 'today'

  const clientId = process.env.GOOGLE_CLIENT_ID
  const clientSecret = process.env.GOOGLE_CLIENT_SECRET
  const refreshToken = process.env.GOOGLE_REFRESH_TOKEN
  const svetaCalendarId = process.env.SVETA_CALENDAR_ID

  if (!clientId || !clientSecret || !refreshToken) {
    return NextResponse.json({ events: [], error: 'not_configured' })
  }

  const auth = new google.auth.OAuth2(clientId, clientSecret)
  auth.setCredentials({ refresh_token: refreshToken })

  const now = new Date()
  const todayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate())
  let timeMin = todayStart.toISOString()
  let timeMax: string

  if (range === 'today') {
    timeMax = new Date(now.getFullYear(), now.getMonth(), now.getDate() + 1).toISOString()
  } else if (range === 'week') {
    timeMax = new Date(now.getFullYear(), now.getMonth(), now.getDate() + 7).toISOString()
  } else {
    timeMax = new Date(now.getFullYear(), now.getMonth() + 1, 0, 23, 59).toISOString()
    timeMin = new Date(now.getFullYear(), now.getMonth(), 1).toISOString()
  }

  const calendarClient = google.calendar({ version: 'v3', auth })

  const calendars = [
    { id: 'daniilklimov25@gmail.com', owner: 'daniil', color: '#6366f1', name: 'Даниил' },
    ...(svetaCalendarId ? [{ id: svetaCalendarId, owner: 'sveta', color: '#ec4899', name: 'Света' }] : [])
  ]

  const results = await Promise.allSettled(
    calendars.map(cal =>
      calendarClient.events.list({
        calendarId: cal.id,
        timeMin,
        timeMax,
        singleEvents: true,
        orderBy: 'startTime',
        maxResults: 100,
      }).then(r => ({ ...cal, events: r.data.items || [] }))
    )
  )

  const allEvents = results
    .filter(r => r.status === 'fulfilled')
    .flatMap(r => {
      const val = (r as PromiseFulfilledResult<any>).value
      return val.events.map((e: any) => ({
        id: e.id,
        title: e.summary || '(без названия)',
        start: e.start?.dateTime || e.start?.date,
        end: e.end?.dateTime || e.end?.date,
        allDay: !e.start?.dateTime,
        description: e.description || null,
        location: e.location || null,
        owner: val.owner,
        ownerName: val.name,
        color: val.color,
      }))
    })
    .sort((a, b) => new Date(a.start).getTime() - new Date(b.start).getTime())

  return NextResponse.json({ events: allEvents, fetchedAt: new Date().toISOString() })
}