import { useMemo, useState } from "react";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Checkbox } from "@/components/ui/checkbox";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  useCredentialStatuses,
  useResendAllPendingCredentials,
  useResendCredential,
} from "@/hooks/queries/useEntityOnboarding";
import type { CredentialStatus } from "@/types";
import { toast } from "sonner";

export default function CredentialDashboard() {
  const [accountFilter, setAccountFilter] = useState<string>("all");
  const [emailSentFilter, setEmailSentFilter] = useState<string>("all");
  const [placementFilter, setPlacementFilter] = useState<string>("all");
  const [dateFrom, setDateFrom] = useState("");
  const [dateTo, setDateTo] = useState("");
  const [selected, setSelected] = useState<Set<number>>(new Set());

  const filters = useMemo(
    () => ({
      account_status: accountFilter === "all" ? undefined : accountFilter,
      email_sent:
        emailSentFilter === "all" ? undefined : emailSentFilter === "yes" ? true : emailSentFilter === "no" ? false : undefined,
      placement_status: placementFilter === "all" ? undefined : placementFilter,
      date_from: dateFrom || undefined,
      date_to: dateTo || undefined,
    }),
    [accountFilter, emailSentFilter, placementFilter, dateFrom, dateTo],
  );

  const { data, isLoading } = useCredentialStatuses(filters);
  const resendOne = useResendCredential();
  const resendAll = useResendAllPendingCredentials();

  const rows: CredentialStatus[] = data?.data ?? [];

  const toggle = (id: number) => {
    setSelected((prev) => {
      const n = new Set(prev);
      if (n.has(id)) n.delete(id);
      else n.add(id);
      return n;
    });
  };

  const toggleAll = (checked: boolean) => {
    if (!checked) setSelected(new Set());
    else setSelected(new Set(rows.map((r) => r.student_id)));
  };

  return (
    <div className="space-y-6 p-6">
      <div>
        <h1 className="text-2xl font-semibold tracking-tight">Credential dashboard</h1>
        <p className="text-muted-foreground text-sm mt-1">Track onboarding emails and placement</p>
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Filters</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
          <div className="space-y-2">
            <Label>Account status</Label>
            <Select value={accountFilter} onValueChange={setAccountFilter}>
              <SelectTrigger>
                <SelectValue placeholder="All" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All</SelectItem>
                <SelectItem value="pending_first_login">Pending first login</SelectItem>
                <SelectItem value="active">Active</SelectItem>
                <SelectItem value="password_reset_required">Password reset required</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="space-y-2">
            <Label>Email sent</Label>
            <Select value={emailSentFilter} onValueChange={setEmailSentFilter}>
              <SelectTrigger>
                <SelectValue placeholder="All" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All</SelectItem>
                <SelectItem value="yes">Yes</SelectItem>
                <SelectItem value="no">No</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="space-y-2">
            <Label>Placement status</Label>
            <Select value={placementFilter} onValueChange={setPlacementFilter}>
              <SelectTrigger>
                <SelectValue placeholder="All" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All</SelectItem>
                <SelectItem value="not_started">Not started</SelectItem>
                <SelectItem value="in_progress">In progress</SelectItem>
                <SelectItem value="completed">Completed</SelectItem>
                <SelectItem value="bypassed">Bypassed</SelectItem>
              </SelectContent>
            </Select>
          </div>
          <div className="space-y-2 md:col-span-2 lg:col-span-1">
            <Label>Date range</Label>
            <div className="flex gap-2">
              <Input type="date" value={dateFrom} onChange={(e) => setDateFrom(e.target.value)} />
              <Input type="date" value={dateTo} onChange={(e) => setDateTo(e.target.value)} />
            </div>
          </div>
        </CardContent>
      </Card>

      <div className="flex justify-end">
        <Button
          variant="secondary"
          onClick={() =>
            resendAll.mutate(undefined, {
              onSuccess: () => toast.success("Bulk resend started."),
              onError: (e) => toast.error(e instanceof Error ? e.message : "Failed"),
            })
          }
          disabled={resendAll.isPending}
        >
          Resend All Pending
        </Button>
      </div>

      <Card>
        <CardContent className="pt-6">
          {isLoading ? (
            <div className="flex justify-center py-12 text-muted-foreground">Loading…</div>
          ) : (
            <div className="rounded-md border overflow-x-auto">
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead className="w-12">
                      <Checkbox
                        checked={rows.length > 0 && selected.size === rows.length}
                        onCheckedChange={(c) => toggleAll(!!c)}
                      />
                    </TableHead>
                    <TableHead>Name</TableHead>
                    <TableHead>Email</TableHead>
                    <TableHead>Account Status</TableHead>
                    <TableHead>Email Sent</TableHead>
                    <TableHead>First Login</TableHead>
                    <TableHead>Placement Status</TableHead>
                    <TableHead className="text-right">Actions</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {rows.map((r) => (
                    <TableRow key={r.student_id}>
                      <TableCell>
                        <Checkbox
                          checked={selected.has(r.student_id)}
                          onCheckedChange={() => toggle(r.student_id)}
                        />
                      </TableCell>
                      <TableCell className="font-medium">{r.name}</TableCell>
                      <TableCell>{r.email}</TableCell>
                      <TableCell>{r.account_status}</TableCell>
                      <TableCell>{r.email_sent ? "Yes" : "No"}</TableCell>
                      <TableCell>{r.first_login_at ? new Date(r.first_login_at).toLocaleString() : "—"}</TableCell>
                      <TableCell>{r.placement_status}</TableCell>
                      <TableCell className="text-right">
                        <Button
                          size="sm"
                          variant="outline"
                          onClick={() =>
                            resendOne.mutate(r.student_id, {
                              onSuccess: () => toast.success("Email resent."),
                              onError: (e) => toast.error(e instanceof Error ? e.message : "Failed"),
                            })
                          }
                          disabled={resendOne.isPending}
                        >
                          Resend Email
                        </Button>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  );
}