"use client"

import { useMemo, useState } from "react"
import {
  BarChart3,
  CalendarDays,
  ClipboardList,
  GraduationCap,
  Mail,
  Stethoscope,
} from "lucide-react"

import { Button } from "@/shared/components/ui/button"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/shared/components/ui/tabs"
import { cn } from "@/shared/lib/utils"
import type { ChildDashboardData } from "@/modules/parent/types"
import { ChildGradeDetail } from "./child-grade-detail"
import { ChildGradeSummary } from "./child-grade-summary"
import { ChildHomeworkDetail } from "./child-homework-detail"
import { ChildHomeworkSummary } from "./child-homework-summary"
import { ChildScheduleCard } from "./child-schedule-card"
import { ChildExamDetail } from "./child-exam-detail"

export type ChildDetailTab = "overview" | "homework" | "grades" | "exams" | "schedule" | "attendance" | "diagnostic"

const VALID_TABS: ChildDetailTab[] = ["overview", "homework", "grades", "exams", "schedule", "attendance", "diagnostic"]

const isTab = (v: string | undefined | null): v is ChildDetailTab =>
  typeof v === "string" && (VALID_TABS as string[]).includes(v)

const resolveTab = (v: string | undefined | null): ChildDetailTab =>
  isTab(v) ? v : "overview"

export function ChildDetailPanel({
  child,
  initialTab,
  siblingSwitcher,
}: {
  child: ChildDashboardData
  initialTab?: string
  siblingSwitcher?: React.ReactNode
}) {
  const { basicInfo, todaySchedule, weeklySchedule, homeworkSummary, gradeTrend, examResults } = child
  const childName = basicInfo.name ?? "Child"

  const [tab, setTab] = useState<ChildDetailTab>(resolveTab(initialTab))

  const tabs = useMemo(
    () => [
      { id: "overview" as const, label: "Overview", icon: ClipboardList },
      { id: "homework" as const, label: "Homework", icon: ClipboardList },
      { id: "grades" as const, label: "Grades", icon: BarChart3 },
      { id: "exams" as const, label: "Exams", icon: GraduationCap },
      { id: "schedule" as const, label: "Schedule", icon: CalendarDays },
      { id: "attendance" as const, label: "Attendance", icon: CalendarDays },
      { id: "diagnostic" as const, label: "Diagnostic", icon: Stethoscope },
    ],
    [],
  )

  return (
    <div className="space-y-6">
      {siblingSwitcher}

      <Tabs value={tab} onValueChange={(v) => setTab(v as ChildDetailTab)} className="w-full">
        <div className="overflow-x-auto">
          <TabsList className="w-full justify-start">
            {tabs.map((t) => (
              <TabsTrigger
                key={t.id}
                value={t.id}
                className="gap-1.5"
                aria-label={`${t.label} tab`}
              >
                <t.icon className="h-3.5 w-3.5" />
                {t.label}
              </TabsTrigger>
            ))}
          </TabsList>
        </div>

        <TabsContent value="overview" className="mt-6">
          <div className="grid grid-cols-1 gap-6 md:grid-cols-2 lg:grid-cols-3">
            <div className="md:col-span-1 lg:col-span-2 space-y-6">
              <ChildHomeworkSummary
                summary={homeworkSummary}
                childId={basicInfo.id}
                childName={childName}
              />
              <ChildGradeSummary grades={gradeTrend} childId={basicInfo.id} childName={childName} />
            </div>
            <div className="space-y-6">
              <ChildScheduleCard items={todaySchedule} childName={childName} />
            </div>
          </div>
        </TabsContent>

        <TabsContent value="homework" className="mt-6">
          <ChildHomeworkDetail
            summary={homeworkSummary}
            childId={basicInfo.id}
            childName={childName}
          />
        </TabsContent>

        <TabsContent value="grades" className="mt-6">
          <div className="space-y-6">
            <ChildGradeSummary grades={gradeTrend} childId={basicInfo.id} childName={childName} />
            <div>
              <h3 className="text-sm font-medium uppercase text-muted-foreground mb-3">
                Subject Analysis
              </h3>
              <ChildGradeDetail grades={gradeTrend} />
            </div>
          </div>
        </TabsContent>

        <TabsContent value="exams" className="mt-6">
          <ChildExamDetail
            examResults={examResults}
            childId={basicInfo.id}
            childName={childName}
          />
        </TabsContent>

        <TabsContent value="schedule" className="mt-6">
          <ChildScheduleCard
            items={todaySchedule}
            childName={childName}
            weeklyItems={weeklySchedule}
          />
        </TabsContent>

        <TabsContent value="attendance" className="mt-6">
          <div className="rounded-md border bg-muted/30 p-6 text-center">
            <p className="text-sm text-muted-foreground">
              Attendance details are available on the{" "}
              <a
                href="/parent/attendance"
                className="font-medium text-foreground underline-offset-4 hover:underline"
              >
                Attendance page
              </a>
              .
            </p>
          </div>
        </TabsContent>

        <TabsContent value="diagnostic" className="mt-6">
          <div className="rounded-md border bg-muted/30 p-6 text-center">
            <p className="text-sm text-muted-foreground">
              Diagnostic reports will be available here once published by the school.
            </p>
          </div>
        </TabsContent>
      </Tabs>

      <div className="flex justify-end">
        <Button asChild variant="ghost" size="sm" className="gap-2">
          <a href={`/messages?studentId=${basicInfo.id}`} aria-label={`Contact teacher about ${childName}`}>
            <Mail className="h-4 w-4" />
            Contact Teacher
          </a>
        </Button>
      </div>
    </div>
  )
}

/** 紧凑的子女切换器（用于详情页头部）。 */
export function SiblingSwitcher({
  current,
  siblings,
}: {
  current: { id: string; name: string | null }
  siblings: Array<{ id: string; name: string | null }>
}) {
  if (siblings.length <= 1) return null

  return (
    <div className="flex flex-wrap items-center gap-2 rounded-md border bg-muted/30 p-2">
      <span className="px-2 text-xs font-medium uppercase text-muted-foreground">Switch child</span>
      <div className="flex flex-wrap gap-1">
        {siblings.map((s) => {
          const isActive = s.id === current.id
          const label = s.name ?? "Child"
          return (
            <a
              key={s.id}
              href={`/parent/children/${s.id}`}
              aria-current={isActive ? "page" : undefined}
              aria-label={`View ${label}'s details`}
              className={cn(
                "inline-flex min-h-[40px] items-center rounded-md px-3 text-sm font-medium transition-colors",
                "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2",
                isActive
                  ? "bg-primary text-primary-foreground"
                  : "bg-background text-foreground hover:bg-muted",
              )}
            >
              {label}
            </a>
          )
        })}
      </div>
    </div>
  )
}