// app/api/book/latest-chapters/route.ts
// 获取最新章节：有2日内更新则取最新3章，否则随机取免费章节

import { NextResponse } from 'next/server'
import { query } from '@/lib/db'

const TWO_DAYS_MS = 2 * 24 * 60 * 60 * 1000

export async function GET() {
  try {
    let allChapters: Array<{
      id: string
      title: string
      part: string
      isFree: boolean
      price: number
      updatedAt: Date | string | null
      createdAt: Date | string | null
    }> = []

    try {
      const dbRows = (await query(`
        SELECT id, part_title, section_title, is_free, price, created_at, updated_at
        FROM chapters
        ORDER BY sort_order ASC, id ASC
      `)) as any[]

      if (dbRows?.length > 0) {
        allChapters = dbRows.map((row: any) => ({
          id: row.id,
          title: row.section_title || row.title || '',
          part: row.part_title || '真实的行业',
          isFree: !!row.is_free,
          price: row.price || 0,
          updatedAt: row.updated_at || row.created_at,
          createdAt: row.created_at
        }))
      }
    } catch (e) {
      console.log('[latest-chapters] 数据库读取失败:', (e as Error).message)
    }

    if (allChapters.length === 0) {
      return NextResponse.json({
        success: true,
        banner: { id: '1.1', title: '荷包：电动车出租的被动收入模式', part: '真实的人' },
        label: '为你推荐',
        chapters: [],
        hasNewUpdates: false
      })
    }

    const now = Date.now()
    const sorted = [...allChapters].sort((a, b) => {
      const ta = a.updatedAt ? new Date(a.updatedAt).getTime() : 0
      const tb = b.updatedAt ? new Date(b.updatedAt).getTime() : 0
      return tb - ta
    })

    const mostRecentTime = sorted[0]?.updatedAt ? new Date(sorted[0].updatedAt).getTime() : 0
    const hasNewUpdates = now - mostRecentTime < TWO_DAYS_MS

    let banner: { id: string; title: string; part: string }
    let label: string
    let chapters: typeof allChapters

    if (hasNewUpdates && sorted.length > 0) {
      chapters = sorted.slice(0, 3)
      banner = { id: chapters[0].id, title: chapters[0].title, part: chapters[0].part }
      label = '最新更新'
    } else {
      const freeChapters = allChapters.filter((c) => c.isFree || c.price === 0)
      const candidates = freeChapters.length > 0 ? freeChapters : allChapters
      const shuffled = [...candidates].sort(() => Math.random() - 0.5)
      chapters = shuffled.slice(0, 3)
      banner = chapters[0]
        ? { id: chapters[0].id, title: chapters[0].title, part: chapters[0].part }
        : { id: allChapters[0].id, title: allChapters[0].title, part: allChapters[0].part }
      label = '为你推荐'
    }

    return NextResponse.json({
      success: true,
      banner,
      label,
      chapters: chapters.map((c) => ({ id: c.id, title: c.title, part: c.part, isFree: c.isFree })),
      hasNewUpdates
    })
  } catch (error) {
    console.error('[latest-chapters] Error:', error)
    return NextResponse.json(
      { success: false, error: '获取失败' },
      { status: 500 }
    )
  }
}