import { getTranslations } from "next-intl/server"
import { getAuthContext } from "@/shared/lib/auth-guard"
import { CalendarCheck } from "lucide-react"

import { createAttendanceReadService } from "@/modules/attendance/services/attendance-data-service"
import type { AttendanceReadService } from "@/modules/attendance/services/types"
import {
  ParentChildrenDataPage,
  ParentNoChildrenPage,
} from "@/modules/parent/components/parent-children-data-page"
import { ParentAttendanceWarning } from "@/modules/parent/components/parent-attendance-warning"
import { ParentAttendanceRateCard } from "@/modules/parent/components/parent-attendance-rate-card"
import { ParentAttendanceCalendar } from "@/modules/parent/components/parent-attendance-calendar"
import { ParentStudentAttendanceDetail } from "@/modules/parent/components/parent-student-attendance-detail"
import type { ParentStudentAttendanceSummary } from "@/modules/parent/types"

export const dynamic = "force-dynamic"

/**
 * 将 attendance 模块的 StudentAttendanceSummary 映射为 parent 模块的视图模型。
 * parent 模块仅消费自身类型，不依赖 attendance 内部类型变更（P1-2 解耦）。
 */
function toParentSummary(
  summary: Awaited<ReturnType<AttendanceReadService["getStudentSummary"]>>,
): ParentStudentAttendanceSummary | null {
  if (!summary) return null
  return {
    studentId: summary.studentId,
    studentName: summary.studentName,
    stats: {
      total: summary.stats.total,
      present: summary.stats.present,
      absent: summary.stats.absent,
      late: summary.stats.late,
      presentRate: summary.stats.presentRate,
    },
    recentRecords: summary.recentRecords.map((r) => ({
      id: r.id,
      date: r.date,
      status: r.status,
      reason: r.reason,
      remark: r.remark,
    })),
  }
}

export default async function ParentAttendancePage() {
  const t = await getTranslations("attendance")
  const ctx = await getAuthContext()

  if (ctx.dataScope.type !== "children" || ctx.dataScope.childrenIds.length === 0) {
    return (
      <ParentNoChildrenPage
        title={t("title.parent")}
        description={t("description.parent")}
        icon={CalendarCheck}
        emptyTitle={t("parent.noChildrenTitle")}
        emptyDescription={t("parent.noChildrenDescription")}
      />
    )
  }

  // 通过接口抽象消费 attendance 数据（P1-2 修复：不再直接 import data-access）
  const attendanceService = createAttendanceReadService(ctx.dataScope)

  // 使用 allSettled 容错：单个子女查询失败不影响其他子女展示
  const results = await Promise.allSettled(
    ctx.dataScope.childrenIds.map((id) => attendanceService.getStudentSummary(id)),
  )
  const validSummaries = results
    .map((r) =>
      r.status === "fulfilled" ? toParentSummary(r.value) : null,
    )
    .filter((s): s is ParentStudentAttendanceSummary => s !== null)

  return (
    <ParentChildrenDataPage
      title={t("title.parent")}
      description={t("parent.compareDescription")}
      icon={CalendarCheck}
      noRecordsTitle={t("list.empty")}
      noRecordsDescription={t("parent.noRecordsDescription")}
      items={validSummaries}
      renderItem={(summary) => (
        <div className="space-y-6">
          <h3 className="text-lg font-semibold border-b pb-2">{summary.studentName}</h3>
          <ParentAttendanceCalendar summary={summary} />
          <ParentStudentAttendanceDetail summary={summary} />
        </div>
      )}
      headerExtra={
        validSummaries.length > 0 ? (
          <div className="space-y-4">
            <ParentAttendanceRateCard summaries={validSummaries} />
            <ParentAttendanceWarning summaries={validSummaries} />
          </div>
        ) : null
      }
    />
  )
}