import { FormEvent, useMemo, useState } from "react";
import { useSearchParams } from "react-router-dom";
import { useMutation, useQueries, useQueryClient } from "@tanstack/react-query";
import type { DiseaseSlug } from "@zeavis/shared";
import { Button } from "@/components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { DiagnosisStatusBadge } from "@/components/diagnosis-status-badge";
import { apiClient } from "@/lib/api-client";

export function ExpertReviewsPage() {
  const [searchParams, setSearchParams] = useSearchParams();
  const selectedId = searchParams.get("diagnosis");
  const [verdict, setVerdict] = useState<"verified" | "corrected">("verified");
  const [correctedDiseaseSlug, setCorrectedDiseaseSlug] = useState<
    DiseaseSlug | ""
  >("");
  const [notes, setNotes] = useState("");
  const queryClient = useQueryClient();

  const [reviewsQuery, diseasesQuery] = useQueries({
    queries: [
      {
        queryKey: ["expert-reviews"],
        queryFn: () => apiClient.getExpertReviews(),
      },
      { queryKey: ["diseases"], queryFn: () => apiClient.getDiseases() },
    ],
  });

  const reviews = reviewsQuery.data || [];
  const diseases = diseasesQuery.data || [];
  const selected = useMemo(
    () => reviews.find((item) => item.id === selectedId) ?? reviews[0] ?? null,
    [reviews, selectedId],
  );

  const mutation = useMutation({
    mutationFn: () =>
      apiClient.reviewDiagnosis(selected!.id, {
        verdict,
        correctedDiseaseSlug:
          verdict === "corrected"
            ? correctedDiseaseSlug || undefined
            : undefined,
        notes,
      }),
    onSuccess: () => {
      setNotes("");
      setVerdict("verified");
      setCorrectedDiseaseSlug("");
      queryClient.invalidateQueries({ queryKey: ["expert-reviews"] });
      queryClient.invalidateQueries({ queryKey: ["dashboard-summary"] });
    },
  });

  async function handleSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!selected) return;
    await mutation.mutateAsync();
  }

  const isLoading = reviewsQuery.isPending || diseasesQuery.isPending;

  return (
    <div className="space-y-6">
      <div className="flex flex-col sm:flex-row items-start sm:items-center justify-between gap-3">
        <div>
          <h1 className="text-2xl font-bold text-emerald-800">Tinjauan Pakar</h1>
          <p className="text-gray-500 mt-1 text-md">
            Tinjau hasil diagnosa dari scan yang telah dilakukan dan berikan
            feedback untuk meningkatkan akurasi sistem AI ZeaVis Edu
          </p>
        </div>
      </div>

      <div className="grid gap-6 lg:grid-cols-3">
        {/* Left: List of reviews */}
        <div className="space-y-3">
          <div className="flex items-center justify-between">
            <h2 className="font-semibold">Daftar Diagnosis</h2>
            <span className="rounded-full bg-muted px-2.5 py-0.5 text-xs font-medium">
              {reviews.length}
            </span>
          </div>

          <div className="space-y-2">
            {isLoading ? (
              <p className="text-sm text-muted-foreground">
                Memuat diagnosis...
              </p>
            ) : reviews.length === 0 ? (
              <p className="text-sm text-muted-foreground">
                Tidak ada diagnosis yang menunggu review
              </p>
            ) : (
              reviews.map((review) => (
                <button
                  key={review.id}
                  type="button"
                  onClick={() => setSearchParams({ diagnosis: review.id })}
                  className={`w-full text-left transition ${
                    selected?.id === review.id
                      ? "ring-2 ring-primary"
                      : "hover:border-primary"
                  }`}
                >
                  <Card className="transition hover:border-primary">
                    <CardContent className="flex gap-3 p-3 items-start">
                      <img
                        src={review.imageUrl}
                        alt="Daun jagung"
                        className="h-14 md:h-20 w-14 md:w-20 rounded-lg object-cover shrink-0"
                      />
                      <div className="min-w-0 flex-1 space-y-1">
                        <div className="flex flex-wrap items-center justify-between gap-1">
                          <h3 className="text-sm font-semibold">
                            {review.disease?.commonName ?? "Diagnosis gagal"}
                          </h3>
                          <DiagnosisStatusBadge
                            status={review.status}
                            className="text-xs"
                          />
                        </div>
                        <p className="text-xs text-muted-foreground">
                          {review.confidence === null
                            ? "Tidak ada confidence"
                            : `${(review.confidence * 100).toFixed(1)}%`}
                        </p>
                        <p className="text-xs text-muted-foreground">
                          {new Date(review.createdAt).toLocaleString("id-ID")}
                        </p>
                      </div>
                    </CardContent>
                  </Card>
                </button>
              ))
            )}
          </div>
        </div>

        {/* Right: Detail and form */}
        <div className="lg:col-span-2 space-y-6">
          {isLoading ? (
            <Card>
              <CardContent className="p-6 text-center text-muted-foreground">
                Memuat diagnosis...
              </CardContent>
            </Card>
          ) : selected ? (
            <>
              {/* Detail card */}
              <Card>
                <CardHeader>
                  <CardTitle>
                    {selected.disease?.commonName ?? "Diagnosis gagal"}
                  </CardTitle>
                  <CardDescription>
                    {new Date(selected.createdAt).toLocaleString("id-ID")}
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-4">
                  <img
                    src={selected.imageUrl}
                    alt={`Gambar daun jagung untuk ${selected.disease?.commonName ?? "diagnosis"}`}
                    className="h-48 md:h-64 w-full rounded-lg object-cover"
                  />

                  <div className="space-y-2">
                    <div className="flex items-center justify-between">
                      <span className="text-sm font-medium">Status</span>
                      <DiagnosisStatusBadge status={selected.status} />
                    </div>
                    <div className="flex items-center justify-between">
                      <span className="text-sm font-medium">Confidence</span>
                      <span className="text-sm">
                        {selected.confidence === null
                          ? "N/A"
                          : `${(selected.confidence * 100).toFixed(1)}%`}
                      </span>
                    </div>
                  </div>

                  {selected.predictions.length > 0 && (
                    <div className="space-y-2">
                      <h4 className="text-sm font-medium">Prediksi Teratas</h4>
                      <div className="space-y-1">
                        {selected.predictions.map((pred) => (
                          <div
                            key={pred.id}
                            className="flex items-center justify-between text-sm"
                          >
                            <span className="text-muted-foreground">
                              {pred.modelLabel}
                            </span>
                            <span className="font-medium">
                              {(pred.confidence * 100).toFixed(1)}%
                            </span>
                          </div>
                        ))}
                      </div>
                    </div>
                  )}
                </CardContent>
              </Card>

              {/* Review form */}
              <Card>
                <CardHeader>
                  <CardTitle className="text-lg">Review Pakar</CardTitle>
                </CardHeader>
                <CardContent>
                  <form onSubmit={handleSubmit} className="space-y-4">
                    <div className="space-y-2">
                      <label className="text-sm font-medium">Keputusan</label>
                      <div className="flex flex-col sm:flex-row gap-3">
                        <label
                          htmlFor="verdict-verified"
                          className="flex items-center gap-2"
                        >
                          <input
                            id="verdict-verified"
                            type="radio"
                            name="verdict"
                            value="verified"
                            checked={verdict === "verified"}
                            onChange={(e) => {
                              setVerdict(
                                e.target.value as "verified" | "corrected",
                              );
                              setCorrectedDiseaseSlug("");
                            }}
                            className="h-4 w-4"
                          />
                          <span className="text-sm">Terverifikasi</span>
                        </label>
                        <label
                          htmlFor="verdict-corrected"
                          className="flex items-center gap-2"
                        >
                          <input
                            id="verdict-corrected"
                            type="radio"
                            name="verdict"
                            value="corrected"
                            checked={verdict === "corrected"}
                            onChange={(e) =>
                              setVerdict(
                                e.target.value as "verified" | "corrected",
                              )
                            }
                            className="h-4 w-4"
                          />
                          <span className="text-sm">Dikoreksi</span>
                        </label>
                      </div>
                    </div>

                    {verdict === "corrected" && (
                      <div className="space-y-2">
                        <label
                          htmlFor="disease"
                          className="text-sm font-medium"
                        >
                          Penyakit yang Benar
                        </label>
                        <select
                          id="disease"
                          value={correctedDiseaseSlug}
                          onChange={(e) =>
                            setCorrectedDiseaseSlug(
                              e.target.value as DiseaseSlug | "",
                            )
                          }
                          required={verdict === "corrected"}
                          className="w-full rounded-md border border-border bg-background px-3 py-2 text-sm"
                        >
                          <option value="">Pilih penyakit...</option>
                          {diseases.map((disease) => (
                            <option key={disease.slug} value={disease.slug}>
                              {disease.commonName}
                            </option>
                          ))}
                        </select>
                      </div>
                    )}

                    <div className="space-y-2">
                      <label htmlFor="notes" className="text-sm font-medium">
                        Catatan <span className="text-red-500">*</span>
                      </label>
                      <textarea
                        id="notes"
                        value={notes}
                        onChange={(e) => setNotes(e.target.value)}
                        placeholder="Tulis catatan review Anda..."
                        required
                        className="w-full rounded-md border border-border bg-background px-3 py-2 text-sm placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-primary"
                        rows={4}
                      />
                    </div>

                    <Button
                      type="submit"
                      disabled={
                        mutation.isPending ||
                        (verdict === "corrected" && !correctedDiseaseSlug) ||
                        !notes.trim()
                      }
                      className="w-full"
                    >
                      {mutation.isPending ? "Mengirim..." : "Kirim Review"}
                    </Button>

                    {mutation.isError && (
                      <p className="text-sm text-red-500">
                        Error:{" "}
                        {mutation.error instanceof Error
                          ? mutation.error.message
                          : "Terjadi kesalahan"}
                      </p>
                    )}
                  </form>
                </CardContent>
              </Card>
            </>
          ) : (
            <Card>
              <CardContent className="p-6 text-center text-muted-foreground">
                Tidak ada diagnosis yang tersedia untuk review
              </CardContent>
            </Card>
          )}
        </div>
      </div>
    </div>
  );
}