"use client";

import React, { useState, useEffect } from "react";
import { Check } from "lucide-react";
import confetti from "canvas-confetti";
import { BoothConfig } from "@/types/booth";
import { useI18n } from "@/lib/i18n";
import { MascotGuide } from "@/components/MascotGuide";

interface ResultScreenProps {
  config: BoothConfig;
  resultImageUrl: string;
  providerInfo?: {
    provider: string;
    model: string;
    durationMs: number;
    fallbackTriggered: boolean;
  };
  onFinish?: () => void;
}

export const ResultScreen: React.FC<ResultScreenProps> = ({
  config,
  resultImageUrl,
  providerInfo,
  onFinish,
}) => {
  const { t, isWeChat } = useI18n();
  const [displayImageUrl, setDisplayImageUrl] = useState(resultImageUrl);

  useEffect(() => {
    try {
      confetti({
        particleCount: 80,
        spread: 85,
        origin: { y: 0.65 },
        colors: ["#ff6d00", "#06b6d4", "#a855f7", "#fbbf24", "#ffffff"],
      });
    } catch (e) {
      // Ignore
    }

  }, []);

  useEffect(() => {
    let cancelled = false;
    let jpegObjectUrl: string | undefined;
    setDisplayImageUrl(resultImageUrl);

    const prepareJpegForDisplay = async () => {
      try {
        const response = await fetch(resultImageUrl);
        if (!response.ok) return;

        const sourceBlob = await response.blob();
        if (sourceBlob.type.toLowerCase() === "image/jpeg") return;

        const bitmap = await createImageBitmap(sourceBlob);
        const canvas = document.createElement("canvas");
        canvas.width = bitmap.width;
        canvas.height = bitmap.height;
        const context = canvas.getContext("2d");
        if (!context) {
          bitmap.close();
          return;
        }

        context.fillStyle = "#ffffff";
        context.fillRect(0, 0, canvas.width, canvas.height);
        context.drawImage(bitmap, 0, 0);
        bitmap.close();

        const jpegBlob = await new Promise<Blob>((resolve, reject) => {
          canvas.toBlob((blob) => {
            if (blob) resolve(blob);
            else reject(new Error("Could not encode portrait as JPEG"));
          }, "image/jpeg", 0.92);
        });

        jpegObjectUrl = URL.createObjectURL(jpegBlob);
        if (cancelled) {
          URL.revokeObjectURL(jpegObjectUrl);
        } else {
          setDisplayImageUrl(jpegObjectUrl);
        }
      } catch {
        // Keep the source image when the browser cannot fetch or encode it.
      }
    };

    void prepareJpegForDisplay();
    return () => {
      cancelled = true;
      if (jpegObjectUrl) URL.revokeObjectURL(jpegObjectUrl);
    };
  }, [resultImageUrl]);

  const handleDownload = () => {
    const a = document.createElement("a");
    const isStoredPortrait = resultImageUrl.startsWith("/api/images/");
    const isStoredJpeg = isStoredPortrait && /\.jpe?g(?:[?#]|$)/i.test(resultImageUrl);
    a.href = isStoredJpeg
      ? `${resultImageUrl}?download=1`
      : displayImageUrl;
    const extension = isStoredJpeg
      ? "jpg"
      : displayImageUrl.startsWith("blob:")
        ? "jpg"
        : resultImageUrl.match(/\.(jpe?g|png|webp)(?:[?#]|$)/i)?.[1] || "webp";
    a.download = `shanghai-karate-spooky-${Date.now()}.${extension}`;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
  };

  return (
    <div className="relative flex-1 flex flex-col justify-between p-2 sm:p-3 overflow-hidden select-none">
      {/* Top spacing */}
      <div className="w-full min-h-[4px] sm:min-h-[8px]" />

      {/* Main Result Image Card - Compact 9:16 frame */}
      <div className="relative w-full max-w-[275px] sm:max-w-[310px] mx-auto aspect-[9/16] rounded-2xl sm:rounded-3xl overflow-hidden bg-black border-4 border-black shadow-[0_8px_0_#090314,0_0_25px_rgba(255,109,0,0.3)] flex items-center justify-center my-auto">
        {/* eslint-disable-next-line @next/next/no-img-element */}
        <img
          src={displayImageUrl}
          alt="Halloween Karate Result"
          className="w-full h-full object-cover select-auto"
          style={{ WebkitTouchCallout: "default" }}
        />

        {/* WeChat Long-Press Save Floating Badge */}
        {isWeChat && (
          <div className="absolute top-2 inset-x-3 py-1 px-3 rounded-full bg-black/75 backdrop-blur-sm border border-amber-400/50 text-center">
            <span className="text-xs font-bold text-amber-300">
              👉 {t(config.labels.wechatSaveTip)}
            </span>
          </div>
        )}
      </div>

      {/* Mascot sits above a single row of portrait actions. */}
      <div className="w-full max-w-[340px] sm:max-w-md mx-auto flex flex-col items-center z-30 -mt-6 px-1 pb-1">
        <div className="pointer-events-none -mb-3">
          <MascotGuide
            pose="zen"
            size="sm"
            speechPosition="top"
            speechClassName="max-w-[280px] sm:max-w-[320px]"
            speechText={{
              en: "Sensational! A true Shanghai Halloween Master!",
              zh: "太赞了！真正的万圣空手道宗师诞生！",
            }}
          />
        </div>

        <div className="w-full grid grid-cols-2 gap-3 pb-1.5">
          <button
            onClick={handleDownload}
            className="min-h-11 w-full justify-center px-3 game-btn-gold font-extrabold text-sm tracking-wider flex items-center shadow-lg active:scale-95 cursor-pointer"
          >
            <span>{t(config.labels.downloadLabel)}</span>
          </button>

          {onFinish && (
            <button
              onClick={onFinish}
              className="min-h-11 w-full justify-center px-3 game-btn-dark text-sm font-bold tracking-wide flex items-center space-x-1.5 shadow-lg active:scale-95 cursor-pointer"
            >
              <Check size={16} className="stroke-[3]" />
              <span>{t(config.labels.startOverLabel)}</span>
            </button>
          )}
        </div>
      </div>
    </div>
  );
};