// src/app/api/monitor/status/route.ts
import { NextRequest, NextResponse } from 'next/server'
import { getDb } from '@/lib/db'
import { initDatabase } from '@/lib/db-schema'
import { getCurrentUser } from '@/lib/auth'
import { hasPermission } from '@/lib/permissions'
import { getSetting } from '@/lib/monitor/settings-manager'

export async function GET(request: NextRequest) {
  try {
    initDatabase()
    const user = await getCurrentUser()
    if (!user || !hasPermission(user, 'monitor:read')) {
      return NextResponse.json({ error: '权限不足' }, { status: 403 })
    }
    const db = getDb()
    const enabled = getSetting('monitor.enabled') === 'true'
    const lastTick = db.prepare("SELECT created_at, details FROM monitor_logs WHERE action = 'tick_complete' ORDER BY id DESC LIMIT 1").get() as { created_at: string; details: string } | undefined

    // 使用 UTC+8 日期（数据库中 created_at 是 UTC+8）
    const now = new Date()
    const todayStart = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}-${String(now.getDate()).padStart(2, '0')} 00:00:00`
    const todayProcessed = (db.prepare("SELECT COUNT(*) as c FROM monitor_logs WHERE action = 'ticket_created' AND created_at >= ?").get(todayStart) as { c: number }).c
    const totalProcessed = (db.prepare("SELECT COUNT(*) as c FROM monitor_logs WHERE action = 'ticket_created'").get() as { c: number }).c
    // 最近一次 tick 的错误状态：action='error' → 1；tick_complete → 该 tick 的 errors 数；无记录 → 0
    const lastLog = db.prepare(
      "SELECT action, details FROM monitor_logs WHERE action IN ('error', 'tick_complete') ORDER BY id DESC LIMIT 1"
    ).get() as { action: string; details: string | null } | undefined
    let errorCount = 0
    if (lastLog) {
      if (lastLog.action === 'error') {
        errorCount = 1
      } else {
        try { errorCount = JSON.parse(lastLog.details || '{}').errors || 0 } catch { errorCount = 0 }
      }
    }
    const ongoingFaultsCount = (db.prepare("SELECT COUNT(*) as c FROM fault_records WHERE status = 'ongoing'").get() as { c: number }).c

    // 获取最近的活动（tick_complete 或 error）
    const lastActivity = db.prepare("SELECT created_at, action FROM monitor_logs WHERE action IN ('tick_complete', 'error') ORDER BY id DESC LIMIT 1").get() as { created_at: string; action: string } | undefined

    let workerHealth = 'unknown'
    if (enabled && lastActivity) {
      const elapsed = Date.now() - new Date(lastActivity.created_at.replace(' ', 'T') + '+08:00').getTime()
      if (elapsed < 180_000) {
        workerHealth = lastActivity.action === 'error' ? 'error' : 'healthy'
      } else {
        workerHealth = 'unresponsive'
      }
    } else if (!enabled) {
      workerHealth = 'stopped'
    }

    const lastError = db.prepare("SELECT details, created_at FROM monitor_logs WHERE action = 'error' ORDER BY id DESC LIMIT 1").get() as { details: string; created_at: string } | undefined

    // 今日处理详情：从 monitor_logs 获取今天的工单创建记录
    const todayProcessedDetails = db.prepare(
      "SELECT details, created_at FROM monitor_logs WHERE action = 'ticket_created' AND created_at >= ? ORDER BY id DESC LIMIT 20"
    ).all(todayStart) as { details: string; created_at: string }[]

    // 进行中故障详情
    const ongoingFaultsDetails = db.prepare(
      "SELECT * FROM fault_records WHERE status = 'ongoing' ORDER BY fault_time DESC LIMIT 20"
    ).all() as Record<string, unknown>[]

    // 最近错误列表
    const recentErrors = db.prepare(
      "SELECT details, created_at FROM monitor_logs WHERE action = 'error' ORDER BY id DESC LIMIT 10"
    ).all() as { details: string; created_at: string }[]

    return NextResponse.json({
      enabled,
      status: enabled ? 'running' : 'stopped',
      workerHealth,
      lastCheck: lastTick?.created_at || null,
      stats: {
        totalProcessed,
        todayProcessed,
        errors: errorCount,
        lastError: lastError?.details || null,
        lastErrorTime: lastError?.created_at || null,
      },
      ongoingFaults: ongoingFaultsCount,
      details: {
        todayProcessed: todayProcessedDetails.map(d => {
          try { return { ...JSON.parse(d.details), created_at: d.created_at } }
          catch { return { details: d.details, created_at: d.created_at } }
        }),
        ongoingFaults: ongoingFaultsDetails,
        recentErrors: recentErrors.map(d => {
          try { return { ...JSON.parse(d.details), created_at: d.created_at } }
          catch { return { details: d.details, created_at: d.created_at } }
        }),
      },
    })
  } catch (e) {
    return NextResponse.json({ error: e instanceof Error ? e.message : 'Internal error' }, { status: 500 })
  }
}