/**
 * Google Calendar Service
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */
import { google } from 'googleapis'

const oauth2Client = new google.auth.OAuth2(
  '188617934470-pomrua9oj4459dk69jpv6qhvst9pd3f6.apps.googleusercontent.com',
  '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',
  'https://developers.google.com/oauthplayground'
)

oauth2Client.setCredentials({
  refresh_token: '1//03AJOfA8x4_eyCgYIARAAGAMSNwF-L9Ir2hVygx8arVuZpZKJpqPsFpGCLo3pXJGC9rxpHnVw5Gki5cLWG7Ez64RcT0RFVItZ2fQ'
})

const calendar = google.calendar({ version: 'v3', auth: oauth2Client })

interface CalendarEvent {
  titulo: string
  hora: string
  data?: string
  tipo: 'personal' | 'work'
  link: string
}

export async function getEvents(calendarId: string, timeMin: string, timeMax: string): Promise<CalendarEvent[]> {
  try {
    const response = await calendar.events.list({
      calendarId,
      timeMin,
      timeMax,
      singleEvents: true,
      orderBy: 'startTime',
      maxResults: 20
    })

    const events: CalendarEvent[] = []
    const items = response.data.items || []

    for (const event of items) {
      const start = event.start?.dateTime || event.start?.date
      if (!start) continue

      const startDate = new Date(start)
      const tipo = calendarId === 'primary' ? 'personal' : 'work'

      events.push({
        titulo: event.summary || 'Sem título',
        hora: startDate.toLocaleTimeString('pt-PT', { hour: '2-digit', minute: '2-digit' }),
        data: calendarId === 'primary'
          ? undefined
          : startDate.toLocaleDateString('pt-PT', { weekday: 'short', day: '2-digit', month: '2-digit' }),
        tipo,
        link: event.htmlLink || '#'
      })
    }

    return events
  } catch (error) {
    console.error(`Calendar error (${calendarId}):`, error)
    return []
  }
}

export async function getTodayEvents(): Promise<CalendarEvent[]> {
  const today = new Date()
  today.setHours(0, 0, 0, 0)
  const tomorrow = new Date(today)
  tomorrow.setDate(tomorrow.getDate() + 1)

  const timeMin = today.toISOString()
  const timeMax = tomorrow.toISOString()

  const [personal, work] = await Promise.all([
    getEvents('primary', timeMin, timeMax),
    getEvents('emanuel@descomplicar.pt', timeMin, timeMax)
  ])

  return [...personal, ...work].sort((a, b) => a.hora.localeCompare(b.hora))
}

export async function getWeekEvents(): Promise<CalendarEvent[]> {
  const today = new Date()
  today.setHours(0, 0, 0, 0)
  const tomorrow = new Date(today)
  tomorrow.setDate(tomorrow.getDate() + 1)

  const nextSunday = new Date(today)
  nextSunday.setDate(today.getDate() + (7 - today.getDay()))
  nextSunday.setHours(23, 59, 59, 999)

  const timeMin = tomorrow.toISOString()
  const timeMax = nextSunday.toISOString()

  const [personal, work] = await Promise.all([
    getEvents('primary', timeMin, timeMax),
    getEvents('emanuel@descomplicar.pt', timeMin, timeMax)
  ])

  return [...personal, ...work].sort((a, b) => {
    const dateA = a.data + a.hora
    const dateB = b.data + b.hora
    return dateA.localeCompare(dateB)
  })
}