export const runtime = 'nodejs'
import { NextResponse } from 'next/server'
import { PrismaClient } from '@/app/generated/prisma'
import { auth } from '@/auth'

function parseIsoDate(value: string | null): Date | null {
  if (!value) return null
  const d = new Date(value)
  return Number.isFinite(d.getTime()) ? d : null
}

export async function GET(request: Request) {
  const prisma = new PrismaClient()
  try {
    const session = await auth()
    if (!session?.user?.email) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { searchParams } = new URL(request.url)
    const startParam = searchParams.get('start')
    const endParam = searchParams.get('end')
    const mode = (searchParams.get('mode') || 'items').toLowerCase()
    const interval = (searchParams.get('interval') || 'day').toLowerCase() as 'day' | 'week' | 'month'

    const start = parseIsoDate(startParam)
    const end = parseIsoDate(endParam)
    if (!start || !end) {
      return NextResponse.json({ error: 'invalid start/end' }, { status: 400 })
    }
    if (start > end) {
      return NextResponse.json({ error: 'start after end' }, { status: 400 })
    }

    // 날짜를 UTC 기준 하루 경계로 확장
    const startDay = new Date(Date.UTC(start.getUTCFullYear(), start.getUTCMonth(), start.getUTCDate(), 0, 0, 0, 0))
    const endDay = new Date(Date.UTC(end.getUTCFullYear(), end.getUTCMonth(), end.getUTCDate(), 23, 59, 59, 999))

    // 사용자 소속 핸들 조회 (없으면 사용자 필터 생략)
    const userHandles = await prisma.handle.findMany({
      where: { users: { some: { email: session.user.email } } },
      select: { id: true, handle: true },
    })
    const handleIds = userHandles.map(h => h.id)

    // 선택된 채널 필터(query): handleId, handleIds(쉼표), handle, handles(쉼표)
    const handleIdParam = searchParams.get('handleId')
    const handleIdsParam = searchParams.get('handleIds')
    const handleParam = searchParams.get('handle')
    const handlesParam = searchParams.get('handles')
    let selectedHandleIds: string[] | null = null
    if (handleIdParam) selectedHandleIds = [handleIdParam]
    if (!selectedHandleIds && handleIdsParam) selectedHandleIds = handleIdsParam.split(',').map(s => s.trim()).filter(Boolean)
    if (!selectedHandleIds && (handleParam || handlesParam)) {
      const targetHandles = (handlesParam ? handlesParam.split(',') : [handleParam!]).map(s => s!.trim()).filter(Boolean)
      if (targetHandles.length > 0) {
        const matched = await prisma.handle.findMany({ where: { handle: { in: targetHandles } }, select: { id: true } })
        selectedHandleIds = matched.map(m => m.id)
      }
    }

    const where: any = {
      date: { gte: startDay, lte: endDay },
    }
    if (selectedHandleIds && selectedHandleIds.length > 0) {
      // 지정된 채널만
      where.content = { handleId: { in: selectedHandleIds } }
    } else if (handleIds.length > 0) {
      // 사용자 소속 채널만
      where.content = { handleId: { in: handleIds } }
    }

    // 시계열(기간별) 모드: day/week/month로 버킷팅해 합계 반환
    if (mode === 'series') {
      const contentIdsParam = searchParams.get('contentIds')
      let contentIdsFilter: string[] | null = null
      if (contentIdsParam) contentIdsFilter = contentIdsParam.split(',').map(s => s.trim()).filter(Boolean)

      const seriesRows = await prisma.contentDayView.findMany({
        where: {
          ...where,
          ...(contentIdsFilter && contentIdsFilter.length > 0 ? { contentId: { in: contentIdsFilter } } : {}),
        },
        select: {
          date: true,
          views: true,
          validViews: true,
          premiumViews: true,
          watchTime: true,
          content: { select: { handle: { select: { costPerView: true } } } },
        },
        orderBy: { date: 'asc' },
      })

      // 버킷 키 생성기
      const makeKey = (d: Date): string => {
        const y = d.getUTCFullYear()
        const m = String(d.getUTCMonth() + 1).padStart(2, '0')
        const dd = String(d.getUTCDate()).padStart(2, '0')
        if (interval === 'day') return `${y}-${m}-${dd}`
        if (interval === 'month') return `${y}-${m}`
        // week: ISO 주 시작(월요일)로 버킷팅
        const date = new Date(Date.UTC(y, d.getUTCMonth(), d.getUTCDate()))
        const day = date.getUTCDay() || 7 // 1..7, 월=1, 일=7
        const monday = new Date(date)
        monday.setUTCDate(date.getUTCDate() - (day - 1))
        const my = String(monday.getUTCMonth() + 1).padStart(2, '0')
        const md = String(monday.getUTCDate()).padStart(2, '0')
        return `${monday.getUTCFullYear()}-${my}-${md}`
      }

      const bucket = new Map<string, { views: number, validViews: number, premiumViews: number, watchTime: number, expectedRevenue: number }>()
      for (const r of seriesRows) {
        const key = makeKey(new Date(r.date))
        const cpv = Number(r.content?.handle?.costPerView ?? 0) || 0
        const cur = bucket.get(key) || { views: 0, validViews: 0, premiumViews: 0, watchTime: 0, expectedRevenue: 0 }
        cur.views += r.views || 0
        cur.validViews += r.validViews || 0
        cur.premiumViews += r.premiumViews || 0
        cur.watchTime += r.watchTime || 0
        const effViews = (r.validViews || 0) + (r.premiumViews || 0)
        cur.expectedRevenue += Math.max(0, Math.round(effViews * cpv))
        bucket.set(key, cur)
      }
      // 빈 버킷 채우기 (연속 타임라인)
      const addZeroIfMissing = (d: Date) => {
        const k = makeKey(d)
        if (!bucket.has(k)) bucket.set(k, { views: 0, validViews: 0, premiumViews: 0, watchTime: 0, expectedRevenue: 0 })
      }
      if (interval === 'day') {
        let d = new Date(Date.UTC(startDay.getUTCFullYear(), startDay.getUTCMonth(), startDay.getUTCDate()))
        const end = new Date(Date.UTC(endDay.getUTCFullYear(), endDay.getUTCMonth(), endDay.getUTCDate()))
        while (d.getTime() <= end.getTime()) {
          addZeroIfMissing(d)
          d = new Date(d.getTime() + 24*60*60*1000)
        }
      } else if (interval === 'week') {
        const mkMonday = (d0: Date) => {
          const t = new Date(Date.UTC(d0.getUTCFullYear(), d0.getUTCMonth(), d0.getUTCDate()))
          const wd = t.getUTCDay() || 7
          t.setUTCDate(t.getUTCDate() - (wd - 1))
          return t
        }
        let d = mkMonday(startDay)
        const end = new Date(Date.UTC(endDay.getUTCFullYear(), endDay.getUTCMonth(), endDay.getUTCDate()))
        while (d.getTime() <= end.getTime()) {
          addZeroIfMissing(d)
          d = new Date(d.getTime() + 7*24*60*60*1000)
        }
      } else if (interval === 'month') {
        let d = new Date(Date.UTC(startDay.getUTCFullYear(), startDay.getUTCMonth(), 1))
        const end = new Date(Date.UTC(endDay.getUTCFullYear(), endDay.getUTCMonth(), 1))
        while (d.getTime() <= end.getTime()) {
          addZeroIfMissing(d)
          d = new Date(Date.UTC(d.getUTCFullYear(), d.getUTCMonth() + 1, 1))
        }
      }
      const items = Array.from(bucket.entries()).sort((a,b) => a[0] < b[0] ? -1 : 1).map(([period, agg]) => ({ period, ...agg }))
      return NextResponse.json({ success: true, mode: 'series', interval, start: startDay.toISOString(), end: endDay.toISOString(), count: items.length, items })
    }

    const grouped = await prisma.contentDayView.groupBy({
      by: ['contentId'],
      where,
      _sum: {
        views: true,
        validViews: true,
        premiumViews: true,
        watchTime: true,
      },
    })

    const contentIds = grouped.map(g => g.contentId).filter(Boolean)
    const contents = contentIds.length > 0 ? await prisma.content.findMany({
      where: { id: { in: contentIds } },
      select: {
        id: true,
        subject: true,
        pubDate: true,
        handle: { select: { id: true, handle: true, avatar: true, costPerView: true } },
      },
    }) : []
    const idToContent = new Map(contents.map(c => [c.id, c]))

    const items = grouped.map(g => {
      const c = idToContent.get(g.contentId) as any
      const h = c?.handle as (undefined | { id: string, handle: string, avatar: string | null, costPerView?: number })
      const views = g._sum?.views ?? 0
      const validViews = g._sum?.validViews ?? 0
      const premiumViews = g._sum?.premiumViews ?? 0
      const watchTime = g._sum?.watchTime ?? 0
      const cpv = typeof h?.costPerView === 'number' ? h!.costPerView! : 0
      const expectedRevenue = Math.max(0, Math.round((validViews + premiumViews) * cpv))
      return {
        id: c?.id ?? g.contentId,
        subject: c?.subject ?? '',
        pubDate: (c?.pubDate ?? null) as any,
        views,
        premiumViews,
        watchTime,
        handle: h?.handle ?? '',
        handleId: h?.id ?? null,
        icon: h?.avatar ?? '',
        validViews,
        expectedRevenue,
      }
    })
    items.sort((a, b) => {
      const pa = a.pubDate ? new Date(a.pubDate as any).getTime() : 0
      const pb = b.pubDate ? new Date(b.pubDate as any).getTime() : 0
      return pb - pa
    })

    return NextResponse.json({ success: true, start: startDay.toISOString(), end: endDay.toISOString(), count: items.length, items })
  } catch (e) {
    console.error('[contents/mycontent] error:', e)
    return NextResponse.json({ error: 'query failed' }, { status: 500 })
  } finally {
    try { await (prisma as any).$disconnect() } catch {}
  }
}