import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Switch } from "@/components/ui/switch";
import { Label } from "@/components/ui/label";
import { useState } from "react";
import AiStudyCoach from "@/components/ai/AiStudyCoach";
import AiGradeExplainer from "@/components/ai/AiGradeExplainer";

const students = [
  { name: "Sarah Johnson", entity: "Acme Corp", reading: 7.5, listening: 8.0, writing: 7.0, speaking: 7.5, overall: 7.5, level: "B2" },
  { name: "Ahmed Hassan", entity: "Global Ltd", reading: 5.5, listening: 6.0, writing: 5.0, speaking: 5.5, overall: 5.5, level: "A2" },
  { name: "Maria Garcia", entity: "Acme Corp", reading: 8.5, listening: 8.0, writing: 8.0, speaking: 8.5, overall: 8.25, level: "C1" },
  { name: "Li Wei", entity: "Tech Co", reading: 6.5, listening: 6.0, writing: 6.0, speaking: 6.5, overall: 6.25, level: "B1" },
  { name: "Emma Brown", entity: "Acme Corp", reading: 4.5, listening: 5.0, writing: 4.0, speaking: 4.5, overall: 4.5, level: "A1" },
  { name: "John Park", entity: "Global Ltd", reading: 7.0, listening: 7.5, writing: 6.5, speaking: 7.0, overall: 7.0, level: "B2" },
];

function ScoreBadge({ score }: { score: number }) {
  const color = score >= 7.5 ? "bg-success/10 text-success" : score >= 6.0 ? "bg-warning/10 text-warning" : "bg-destructive/10 text-destructive";
  return <span className={`inline-flex items-center rounded-md px-2 py-0.5 text-xs font-semibold ${color}`}>{score.toFixed(1)}</span>;
}

export default function StudentPerformancePage() {
  const [showUtilisation, setShowUtilisation] = useState(false);

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-2xl font-bold tracking-tight">Student Performance</h1>
        <p className="text-muted-foreground">Track student scores across all IELTS modules.</p>
      </div>

      <AiStudyCoach />

      <div className="flex flex-wrap gap-3 items-center">
        <Select><SelectTrigger className="w-[160px]"><SelectValue placeholder="All Entities" /></SelectTrigger>
          <SelectContent><SelectItem value="all">All Entities</SelectItem><SelectItem value="acme">Acme Corp</SelectItem><SelectItem value="global">Global Ltd</SelectItem></SelectContent>
        </Select>
        <div className="flex items-center gap-2 ml-auto">
          <Switch id="util" checked={showUtilisation} onCheckedChange={setShowUtilisation} />
          <Label htmlFor="util" className="text-sm">Show Utilisation</Label>
        </div>
      </div>

      <Card className="border-0 shadow-sm">
        <CardContent className="p-0">
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>Student</TableHead><TableHead>Entity</TableHead><TableHead>Level</TableHead>
                <TableHead className="text-center">Reading</TableHead><TableHead className="text-center">Listening</TableHead>
                <TableHead className="text-center">Writing</TableHead><TableHead className="text-center">Speaking</TableHead>
                <TableHead className="text-center">Overall</TableHead>
                <TableHead className="w-10">AI</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {students.map((s) => (
                <TableRow key={s.name}>
                  <TableCell className="font-medium">{s.name}</TableCell>
                  <TableCell>{s.entity}</TableCell>
                  <TableCell><Badge variant="outline">{s.level}</Badge></TableCell>
                  <TableCell className="text-center"><ScoreBadge score={s.reading} /></TableCell>
                  <TableCell className="text-center"><ScoreBadge score={s.listening} /></TableCell>
                  <TableCell className="text-center"><ScoreBadge score={s.writing} /></TableCell>
                  <TableCell className="text-center"><ScoreBadge score={s.speaking} /></TableCell>
                  <TableCell className="text-center"><ScoreBadge score={s.overall} /></TableCell>
                  <TableCell><AiGradeExplainer studentName={s.name} /></TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </CardContent>
      </Card>
    </div>
  );
}