"use client"

import Link from "next/link"
import { useTranslations } from "next-intl"
import { Award, AlertTriangle, Lightbulb, FileText, History, ArrowRight } from "lucide-react"

import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/shared/components/ui/card"
import { Badge } from "@/shared/components/ui/badge"
import { Button } from "@/shared/components/ui/button"
import { Tooltip, TooltipContent, TooltipTrigger } from "@/shared/components/ui/tooltip"
import { EmptyState } from "@/shared/components/ui/empty-state"
import { formatDate } from "@/shared/lib/utils"
import { MasteryRadarChart } from "./mastery-radar-chart"
import {
  getConfidenceLevel,
  confidenceBadgeVariant,
  type ConfidenceLevel,
} from "./confidence-utils"
import type { DiagnosticReportWithDetails, MasteryRadarPoint, StudentMasterySummary } from "../types"

interface StudentDiagnosticViewProps {
  summary: StudentMasterySummary | null
  reports: DiagnosticReportWithDetails[]
  classAverageMastery?: MasteryRadarPoint[]
  /**
   * v3-P2-6: "练习"按钮的跳转基础路径。
   * - 学生视角：默认 `/student/learning/assignments`
   * - 教师视角：传入 `/teacher/questions`（题目库支持 kp 查询参数筛选）
   * - 家长视角：传入 `null` 隐藏练习按钮（家长无练习入口）
   * 最终链接会附加 `?kp={knowledgePointId}` 实现个性化练习推荐。
   */
  practiceHrefBase?: string | null
}

export function StudentDiagnosticView({
  summary,
  reports,
  classAverageMastery,
  practiceHrefBase = "/student/learning/assignments",
}: StudentDiagnosticViewProps) {
  const t = useTranslations("diagnostic")

  if (!summary) {
    return (
      <EmptyState
        title={t("empty.noData")}
        description={t("studentDiagnostic.noDataDescription")}
        icon={FileText}
        className="border-none shadow-none"
      />
    )
  }

  const radarData: MasteryRadarPoint[] = summary.allMastery.map((m) => {
    const classAvg = classAverageMastery?.find((c) => c.knowledgePoint === m.knowledgePointName)
    return {
      knowledgePoint: m.knowledgePointName,
      student: Math.round(m.masteryLevel * 100) / 100,
      classAverage: classAvg?.classAverage,
    }
  })

  const publishedReports = reports.filter((r) => r.status === "published")
  // v4-P1-3: 移除草稿回退逻辑，仅展示已发布报告
  // 调用方（学生/家长页面）已传 status: "published" 过滤，此处双重保障
  const latestReport = publishedReports[0] ?? null

  const statusLabel = (status: string): string => {
    if (status === "draft") return t("status.draft")
    if (status === "published") return t("status.published")
    if (status === "archived") return t("status.archived")
    return status
  }

  const typeLabel = (reportType: string): string => {
    if (reportType === "individual") return t("type.individual")
    if (reportType === "class") return t("type.class")
    if (reportType === "grade") return t("type.grade")
    return reportType
  }

  // v4-P3-7: 置信度标签与提示
  const confidenceLabel = (level: ConfidenceLevel): string => {
    if (level === "high") return t("reportList.confidenceHigh")
    if (level === "medium") return t("reportList.confidenceMedium")
    if (level === "low") return t("reportList.confidenceLow")
    return t("reportList.confidenceInsufficient")
  }

  const confidenceHint = (level: ConfidenceLevel): string => {
    if (level === "high") return t("reportList.confidenceHighHint")
    if (level === "medium") return t("reportList.confidenceMediumHint")
    if (level === "low") return t("reportList.confidenceLowHint")
    return t("reportList.confidenceInsufficient")
  }

  return (
    <div className="space-y-6">
      {/* 概览卡片 */}
      <div className="grid grid-cols-1 gap-4 md:grid-cols-4">
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium text-muted-foreground">{t("summary.student")}</CardTitle>
          </CardHeader>
          <CardContent>
            <p className="text-2xl font-bold">{summary.studentName}</p>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium text-muted-foreground">{t("summary.overallMastery")}</CardTitle>
          </CardHeader>
          <CardContent>
            <p className="text-2xl font-bold">{summary.averageMastery.toFixed(1)}%</p>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium text-muted-foreground">{t("summary.strengths")}</CardTitle>
          </CardHeader>
          <CardContent>
            <p className="text-2xl font-bold text-green-600">{summary.strengths.length}</p>
          </CardContent>
        </Card>
        <Card>
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium text-muted-foreground">{t("summary.weaknesses")}</CardTitle>
          </CardHeader>
          <CardContent>
            <p className="text-2xl font-bold text-red-600">{summary.weaknesses.length}</p>
          </CardContent>
        </Card>
      </div>

      {/* 雷达图 */}
      <MasteryRadarChart data={radarData} />

      {/* 强项 / 弱项 */}
      <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Award className="h-4 w-4 text-green-600" />
              {t("strengths.title")}
            </CardTitle>
            <CardDescription>{t("studentDiagnostic.strengthsDescription")}</CardDescription>
          </CardHeader>
          <CardContent>
            {summary.strengths.length === 0 ? (
              <p className="text-sm text-muted-foreground">{t("studentDiagnostic.noStrengths")}</p>
            ) : (
              <ul className="space-y-2" role="list" aria-label={t("studentDiagnostic.strengthsListAriaLabel")}>
                {summary.strengths.map((m) => (
                  <li key={m.knowledgePointId} className="flex items-center justify-between">
                    <span className="text-sm">{m.knowledgePointName}</span>
                    <Badge variant="default" className="bg-green-600">{m.masteryLevel.toFixed(1)}%</Badge>
                  </li>
                ))}
              </ul>
            )}
          </CardContent>
        </Card>
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <AlertTriangle className="h-4 w-4 text-red-600" />
              {t("weaknesses.title")}
            </CardTitle>
            <CardDescription>{t("studentDiagnostic.weaknessesDescription")}</CardDescription>
          </CardHeader>
          <CardContent>
            {summary.weaknesses.length === 0 ? (
              <p className="text-sm text-muted-foreground">{t("studentDiagnostic.noWeaknesses")}</p>
            ) : (
              <ul className="space-y-2" role="list" aria-label={t("studentDiagnostic.weaknessesListAriaLabel")}>
                {summary.weaknesses.map((m) => (
                  <li key={m.knowledgePointId} className="flex items-center justify-between gap-2">
                    <div className="flex items-center gap-2 min-w-0">
                      <span className="text-sm truncate">{m.knowledgePointName}</span>
                      <Badge variant="destructive" className="shrink-0">{m.masteryLevel.toFixed(1)}%</Badge>
                    </div>
                    {practiceHrefBase ? (
                      <Button asChild variant="ghost" size="sm" className="h-7 shrink-0 text-xs" aria-label={t("studentDiagnostic.practiceAriaLabel", { name: m.knowledgePointName })}>
                        <Link href={`${practiceHrefBase}?kp=${m.knowledgePointId}`}>
                          {t("weaknesses.practice")}
                          <ArrowRight className="ml-1 h-3 w-3" />
                        </Link>
                      </Button>
                    ) : null}
                  </li>
                ))}
              </ul>
            )}
          </CardContent>
        </Card>
      </div>

      {/* 最新报告 / 建议 */}
      {latestReport ? (
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Lightbulb className="h-4 w-4" />
              {t("studentDiagnostic.diagnosticReportTitle")}
              <Badge variant={latestReport.status === "published" ? "default" : "secondary"}>
                {statusLabel(latestReport.status)}
              </Badge>
              {(() => {
                const level = getConfidenceLevel(latestReport)
                return (
                  <Tooltip>
                    <TooltipTrigger asChild>
                      <Badge
                        variant={confidenceBadgeVariant[level]}
                        aria-label={t("reportList.confidenceAriaLabel", { level: confidenceLabel(level) })}
                      >
                        {confidenceLabel(level)}
                      </Badge>
                    </TooltipTrigger>
                    <TooltipContent>{confidenceHint(level)}</TooltipContent>
                  </Tooltip>
                )
              })()}
            </CardTitle>
            <CardDescription>
              {t("studentDiagnostic.reportMeta", {
                period: latestReport.period ?? "-",
                score: latestReport.overallScore?.toFixed(1) ?? "-",
              })}
            </CardDescription>
          </CardHeader>
          <CardContent className="space-y-4">
            {latestReport.summary ? (
              <p className="text-sm">{latestReport.summary}</p>
            ) : null}
            {latestReport.recommendations && latestReport.recommendations.length > 0 ? (
              <div>
                <h4 className="mb-2 text-sm font-semibold">{t("report.recommendations")}</h4>
                <ul className="space-y-1.5" role="list" aria-label={t("studentDiagnostic.recommendationsListAriaLabel")}>
                  {latestReport.recommendations.map((rec, i) => (
                    <li key={rec || `rec-${i}`} className="text-sm text-muted-foreground">• {rec}</li>
                  ))}
                </ul>
              </div>
            ) : null}
          </CardContent>
        </Card>
      ) : null}

      {/* 历史报告列表 */}
      {publishedReports.length > 1 ? (
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <History className="h-4 w-4" />
              {t("report.history")}
            </CardTitle>
            <CardDescription>{t("studentDiagnostic.historyDescription")}</CardDescription>
          </CardHeader>
          <CardContent>
            <div className="space-y-2">
              {publishedReports.map((r) => (
                <div
                  key={r.id}
                  className="flex items-center justify-between gap-3 rounded-md border p-3"
                >
                  <div className="min-w-0 space-y-1">
                    <div className="flex items-center gap-2">
                      <span className="text-sm font-medium">
                        {r.period ?? t("studentDiagnostic.untitledPeriod")}
                      </span>
                      <Badge variant="outline" className="text-xs">
                        {typeLabel(r.reportType)}
                      </Badge>
                    </div>
                    <p className="text-xs text-muted-foreground">
                      {r.overallScore !== null
                        ? t("studentDiagnostic.historyReportMeta", {
                            date: formatDate(r.createdAt),
                            score: r.overallScore.toFixed(1),
                          })
                        : formatDate(r.createdAt)}
                    </p>
                  </div>
                </div>
              ))}
            </div>
          </CardContent>
        </Card>
      ) : null}
    </div>
  )
}