import { Activity, AlertTriangle, BedDouble, CheckCircle2, HeartPulse, Users } from "lucide-react";
import type { LucideIcon } from "lucide-react";

import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Table } from "@/components/ui/table";
import type { AdmissionStatus, BedStatus, IncidentSeverity } from "@/modules/core/types";
import { BedOccupancyChart, type BedOccupancyDatum } from "@/modules/dashboard/components/BedOccupancyChart";

export type DashboardMetric = {
  label: string;
  value: string;
  trend: string;
  icon: "users" | "beds" | "admissions" | "incidents";
};

export type DashboardAdmission = {
  id: string;
  elderName: string;
  bedLabel: string;
  status: AdmissionStatus;
  admittedAt: string;
  dischargedAt?: string;
};

export type DashboardIncident = {
  id: string;
  severity: IncidentSeverity;
  status: string;
  title: string;
  source: string;
  createdAt: string;
};

type DashboardHomeProps = {
  metrics: DashboardMetric[];
  occupancyData: BedOccupancyDatum[];
  recentAdmissions: DashboardAdmission[];
  incidents: DashboardIncident[];
};

const metricIcons: Record<DashboardMetric["icon"], LucideIcon> = {
  users: Users,
  beds: BedDouble,
  admissions: CheckCircle2,
  incidents: HeartPulse,
};

const admissionStatusLabels: Record<AdmissionStatus, string> = {
  active: "在住",
  transferred: "已换床",
  discharged: "已退住",
};

const bedStatusLabels: Record<BedStatus, string> = {
  available: "空闲",
  occupied: "占用",
  maintenance: "维修",
  disabled: "停用",
};

function formatDateTime(value: string): string {
  return new Date(value).toLocaleString("zh-CN");
}

function incidentVariant(severity: IncidentSeverity): "secondary" | "warning" | "danger" {
  switch (severity) {
    case "critical":
      return "danger";
    case "warning":
      return "warning";
    case "info":
      return "secondary";
  }
}

export function DashboardHome({
  metrics,
  occupancyData,
  recentAdmissions,
  incidents,
}: DashboardHomeProps): React.ReactElement {
  return (
    <div className="mx-auto flex w-full max-w-7xl flex-col gap-6">
      <section className="flex flex-col gap-4 border-b pb-5 lg:flex-row lg:items-end lg:justify-between">
        <div>
          <Badge variant="success">实时数据</Badge>
          <h1 className="mt-3 text-3xl font-semibold tracking-normal md:text-4xl">运营看板</h1>
          <p className="mt-2 text-sm text-muted-foreground">老人、床位、入住和系统故障概况。</p>
        </div>
      </section>

      <section className="grid gap-4 md:grid-cols-2 xl:grid-cols-4">
        {metrics.map((metric) => {
          const Icon = metricIcons[metric.icon];

          return (
            <Card key={metric.label}>
              <CardHeader className="flex flex-row items-center justify-between space-y-0">
                <CardDescription>{metric.label}</CardDescription>
                <Icon className="size-4 text-primary" aria-hidden="true" />
              </CardHeader>
              <CardContent>
                <CardTitle className="text-3xl">{metric.value}</CardTitle>
                <p className="mt-2 text-xs text-muted-foreground">{metric.trend}</p>
              </CardContent>
            </Card>
          );
        })}
      </section>

      <section className="grid gap-4 xl:grid-cols-[0.95fr_1.05fr]">
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Activity className="size-5 text-primary" aria-hidden="true" />
              床位状态分布
            </CardTitle>
            <CardDescription>
              {occupancyData.map((item) => `${bedStatusLabels[item.label as BedStatus] ?? item.label} ${item.count}`).join(" / ")}
            </CardDescription>
          </CardHeader>
          <CardContent>
            <BedOccupancyChart data={occupancyData} />
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle>最近入住记录</CardTitle>
          </CardHeader>
          <CardContent>
            <div className="overflow-x-auto rounded-md border">
              <Table className="w-full min-w-[620px] text-sm">
                <Table.Header className="bg-secondary text-left text-xs text-muted-foreground">
                  <Table.Row>
                    <Table.Head className="px-4 py-3 font-medium">老人</Table.Head>
                    <Table.Head className="px-4 py-3 font-medium">床位</Table.Head>
                    <Table.Head className="px-4 py-3 font-medium">状态</Table.Head>
                    <Table.Head className="px-4 py-3 font-medium">时间</Table.Head>
                  </Table.Row>
                </Table.Header>
                <Table.Body className="divide-y bg-card">
                  {recentAdmissions.map((admission) => (
                    <Table.Row key={admission.id}>
                      <Table.Cell className="px-4 py-3 font-medium">{admission.elderName}</Table.Cell>
                      <Table.Cell className="px-4 py-3 text-muted-foreground">{admission.bedLabel}</Table.Cell>
                      <Table.Cell className="px-4 py-3">
                        <Badge variant={admission.status === "active" ? "success" : "secondary"}>
                          {admissionStatusLabels[admission.status]}
                        </Badge>
                      </Table.Cell>
                      <Table.Cell className="px-4 py-3 text-muted-foreground">
                        {formatDateTime(admission.dischargedAt ?? admission.admittedAt)}
                      </Table.Cell>
                    </Table.Row>
                  ))}
                  {recentAdmissions.length === 0 ? (
                    <Table.Row>
                      <Table.Cell className="px-4 py-8 text-center text-muted-foreground" colSpan={4}>
                        暂无入住记录
                      </Table.Cell>
                    </Table.Row>
                  ) : null}
                </Table.Body>
              </Table>
            </div>
          </CardContent>
        </Card>
      </section>

      <Card>
        <CardHeader>
          <CardTitle>系统故障</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-3 md:grid-cols-2 xl:grid-cols-3">
          {incidents.map((incident) => (
            <div key={incident.id} className="flex items-start justify-between gap-3 rounded-md border p-3">
              <div className="min-w-0">
                <div className="flex items-center gap-2">
                  <AlertTriangle className="size-4 shrink-0 text-amber-600" aria-hidden="true" />
                  <p className="truncate text-sm font-medium">{incident.title}</p>
                </div>
                <p className="mt-1 text-xs text-muted-foreground">
                  {incident.source} / {formatDateTime(incident.createdAt)}
                </p>
              </div>
              <Badge variant={incidentVariant(incident.severity)}>{incident.status}</Badge>
            </div>
          ))}
          {incidents.length === 0 ? <p className="text-sm text-muted-foreground">暂无未关闭故障</p> : null}
        </CardContent>
      </Card>
    </div>
  );
}