import { createError, defineEventHandler, readBody } from 'h3'
import { db } from '~/drizzle/db'
import { songBlacklists } from '~/drizzle/schema'
import { eq } from 'drizzle-orm'
import { getSystemSettingsCached } from '~~/server/utils/system-settings-helper'
import { matchBlacklistGenre, matchBlacklistLanguage, resolveSongTypes } from '~~/server/utils/song-type-resolver'

export default defineEventHandler(async (event) => {
  const body = await readBody(event)
  const { title, artist, musicPlatform, musicId } = body

  if (!title) {
    throw createError({
      statusCode: 400,
      message: '歌曲标题不能为空'
    })
  }

  // 管理员不受黑名单限制
  const user = event.context.user
  if (user && ['SUPER_ADMIN', 'ADMIN', 'SONG_ADMIN'].includes(user.role)) {
    return {
      isBlocked: false,
      reasons: [],
      song: {
        title,
        artist
      }
    }
  }

  try {
    // 获取系统设置
    const systemSettingsData = await getSystemSettingsCached()
    const showBlacklistKeywords = systemSettingsData?.showBlacklistKeywords ?? false

    // 获取所有活跃的黑名单项
    const blacklistItems = await db
      .select()
      .from(songBlacklists)
      .where(eq(songBlacklists.isActive, true))

    const songFullName = `${title} - ${artist || ''}`.toLowerCase()
    const blocked = []

    // 语种/曲风黑名单：需按 platform+musicId 从音源侧解析类型，解析失败或平台不支持时放行
    const languageItems = blacklistItems.filter((item) => item.type === 'LANGUAGE')
    const genreItems = blacklistItems.filter((item) => item.type === 'GENRE')
    let songTypes: Awaited<ReturnType<typeof resolveSongTypes>> = null
    if (languageItems.length > 0 || genreItems.length > 0) {
      songTypes = await resolveSongTypes(musicPlatform, musicId)
    }

    for (const item of blacklistItems) {
      if (item.type === 'SONG') {
        // 检查具体歌曲
        if (songFullName.includes(item.value.toLowerCase())) {
          blocked.push({
            type: 'song',
            value: item.value,
            reason: item.reason || '该歌曲已被加入黑名单'
          })
        }
      } else if (item.type === 'KEYWORD') {
        // 检查关键词
        if (songFullName.includes(item.value.toLowerCase())) {
          blocked.push({
            type: 'keyword',
            value: showBlacklistKeywords ? item.value : null, // 根据设置决定是否显示具体关键词
            reason:
              item.reason || (showBlacklistKeywords ? `包含关键词：${item.value}` : '包含关键词')
          })
        }
      } else if (item.type === 'LANGUAGE') {
        // 检查语种（「其他」命中已判定的小语种，其余按精确匹配）
        if (songTypes && matchBlacklistLanguage(item.value, songTypes.languages)) {
          blocked.push({
            type: 'language',
            value: item.value,
            reason: item.reason || `该歌曲语种「${item.value}」已被加入黑名单`
          })
        }
      } else if (item.type === 'GENRE') {
        // 检查曲风（与曲风一级分类比对）
        if (songTypes && matchBlacklistGenre(item.value, songTypes.genres)) {
          blocked.push({
            type: 'genre',
            value: item.value,
            reason: item.reason || `该歌曲曲风「${item.value}」已被加入黑名单`
          })
        }
      }
    }

    return {
      isBlocked: blocked.length > 0,
      reasons: blocked,
      song: {
        title,
        artist
      }
    }
  } catch (error) {
    console.error('检查黑名单失败:', error)
    throw createError({
      statusCode: 500,
      message: '检查黑名单失败'
    })
  }
})