"use client";

import React, { useState, useEffect } from "react";
import { Card, CardContent } from "@/components/ui/Card";
import { ProgressBar } from "@/components/ui/ProgressBar";
import {
  Sparkles,
  CheckCircle2,
  Zap,
  Package,
  X
} from "lucide-react";
import { useGenerationStore } from "@/store/generationStore";

interface BatchProgressProps {
  progress: number; // 0-100
  currentIndex?: number; // Current ad being generated (0-based)
  totalCount?: number; // Total number of ads
  generationStartTime?: number | null;
  message?: string;
}

const BATCH_MESSAGES = [
  "Generating your ad set...",
  "Crafting compelling visuals...",
  "Building your ad collection...",
  "Almost there! Finalizing your ads...",
  "Perfecting each creative...",
  "Lining up scroll-stopping ads...",
  "Great things take time - we're crafting perfection!",
] as const;

const ENGAGING_MESSAGES = [
  "Batch generation may take a while, but great things are worth waiting for!",
  "Almost there! We're putting the finishing touches on your batch.",
  "Hang tight! We're creating something amazing for you.",
  "This is taking a bit longer, but we're ensuring top quality!",
  "Just a few more moments... Your batch is almost ready!",
  "We're working hard to make this perfect for you!",
  "Great things take time - we're crafting your batch!",
  "Almost done! We're making sure everything is just right.",
] as const;

export const BatchProgressComponent: React.FC<BatchProgressProps> = ({
  progress,
  currentIndex = 0,
  totalCount = 0,
  generationStartTime,
  message,
}) => {
  const [currentMessageIndex, setCurrentMessageIndex] = useState(0);
  const [elapsedTime, setElapsedTime] = useState(0);
  const [estimatedTimeRemaining, setEstimatedTimeRemaining] = useState<number | null>(null);
  const reset = useGenerationStore((state) => state.reset);

  const clampedProgress = Math.min(100, Math.max(0, progress));
  const isComplete = clampedProgress >= 100;
  const isStuckAtHighProgress = clampedProgress >= 85 && !isComplete;
  const currentAdNumber = currentIndex + 1;

  // Calculate elapsed time
  useEffect(() => {
    if (generationStartTime && !isComplete) {
      const interval = setInterval(() => {
        const elapsed = Math.floor((Date.now() - generationStartTime) / 1000);
        setElapsedTime(elapsed);

        // Estimate time remaining based on progress
        if (clampedProgress > 5 && clampedProgress < 100) {
          const rate = clampedProgress / elapsed; // % per second
          const remaining = (100 - clampedProgress) / rate;
          setEstimatedTimeRemaining(Math.max(0, Math.ceil(remaining)));
        }
      }, 1000);
      return () => clearInterval(interval);
    }
  }, [generationStartTime, isComplete, clampedProgress]);

  // Rotate messages when stuck at high progress
  useEffect(() => {
    if (isStuckAtHighProgress) {
      const interval = setInterval(() => {
        setCurrentMessageIndex((prev) => (prev + 1) % ENGAGING_MESSAGES.length);
      }, 5000); // Change message every 5 seconds
      return () => clearInterval(interval);
    }
  }, [isStuckAtHighProgress]);

  // Rotate batch messages periodically
  useEffect(() => {
    if (!isComplete && !isStuckAtHighProgress) {
      const interval = setInterval(() => {
        setCurrentMessageIndex((prev) => (prev + 1) % BATCH_MESSAGES.length);
      }, 4000); // Change message every 4 seconds
      return () => clearInterval(interval);
    }
  }, [isComplete, isStuckAtHighProgress]);

  // Get current message
  const getCurrentMessage = () => {
    if (message) return message;
    if (isStuckAtHighProgress) {
      return ENGAGING_MESSAGES[currentMessageIndex];
    }
    if (totalCount > 0 && currentIndex >= 0) {
      return `Generating ad ${currentAdNumber} of ${totalCount}...`;
    }
    return BATCH_MESSAGES[currentMessageIndex];
  };

  return (
    <div className="sticky top-20 z-30 mb-6 animate-scale-in">
      <Card variant="glass" className="overflow-hidden shadow-xl border-2 border-blue-200/50 backdrop-blur-xl">
        <CardContent className="pt-6">
          <div className="space-y-6">
            {/* Header with animated icon */}
            <div className="flex items-center justify-between">
              <div className="flex items-center space-x-4">
                {isComplete ? (
                  <div className="relative">
                    <div className="absolute inset-0 bg-green-500 rounded-full animate-ping opacity-75"></div>
                    <CheckCircle2 className="h-8 w-8 text-green-500 relative z-10" />
                  </div>
                ) : (
                  <div className="relative">
                    <div className="absolute inset-0 bg-gradient-to-r from-blue-500 to-cyan-500 rounded-full animate-ping opacity-20"></div>
                    <div className="relative bg-gradient-to-r from-blue-500 to-cyan-500 rounded-full p-2">
                      <Package className="h-5 w-5 text-white animate-pulse" />
                    </div>
                  </div>
                )}
                <div>
                  <h3 className="text-lg font-bold bg-gradient-to-r from-blue-600 to-cyan-600 bg-clip-text text-transparent">
                    {isComplete ? "Batch Generation Complete!" : "Generating Batch Ads"}
                  </h3>
                  <p className="text-sm text-gray-600 mt-0.5 transition-all duration-500">
                    {isComplete ? "All ads are ready!" : getCurrentMessage()}
                  </p>
                  {elapsedTime > 30 && !isComplete && (
                    <p className="text-xs text-gray-500 mt-1">
                      {Math.floor(elapsedTime / 60)}m {elapsedTime % 60}s elapsed
                    </p>
                  )}
                </div>
              </div>
              {estimatedTimeRemaining !== null && !isComplete && (
                <div className="text-right">
                  <div className="flex items-center space-x-1 text-sm font-semibold text-gray-700">
                    <Zap className="h-4 w-4 text-yellow-500 animate-pulse" />
                    <span>~{estimatedTimeRemaining}s</span>
                  </div>
                  <p className="text-xs text-gray-500">remaining</p>
                </div>
              )}
              {!isComplete && (
                <button
                  onClick={() => reset()}
                  className="p-2 hover:bg-red-50 text-gray-400 hover:text-red-500 rounded-full transition-colors group"
                  title="Cancel Generation"
                >
                  <X className="h-5 w-5 group-hover:rotate-90 transition-transform duration-300" />
                </button>
              )}
            </div>

            {/* Batch Stats */}
            {totalCount > 0 && (
              <div className="grid grid-cols-3 gap-4">
                <div className="bg-gradient-to-br from-blue-50 to-cyan-50 rounded-xl p-4 border border-blue-200">
                  <div className="flex items-center space-x-2 mb-1">
                    <Package className="h-4 w-4 text-blue-600" />
                    <p className="text-xs font-semibold text-gray-600">Total Ads</p>
                  </div>
                  <p className="text-2xl font-bold bg-gradient-to-r from-blue-600 to-cyan-600 bg-clip-text text-transparent">
                    {totalCount}
                  </p>
                </div>
                <div className="bg-gradient-to-br from-pink-50 to-purple-50 rounded-xl p-4 border border-pink-200">
                  <div className="flex items-center space-x-2 mb-1">
                    <Sparkles className="h-4 w-4 text-pink-600" />
                    <p className="text-xs font-semibold text-gray-600">Current</p>
                  </div>
                  <p className="text-2xl font-bold bg-gradient-to-r from-pink-600 to-purple-600 bg-clip-text text-transparent">
                    {currentAdNumber}/{totalCount}
                  </p>
                </div>
              </div>
            )}

            {/* Progress Bar */}
            <div className="space-y-2">
              <div className="flex justify-between items-center">
                <span className="text-sm font-semibold text-gray-700">Overall Progress</span>
                <span className="text-sm font-bold bg-gradient-to-r from-blue-600 to-cyan-600 bg-clip-text text-transparent">
                  {Math.round(clampedProgress)}%
                </span>
              </div>
              <ProgressBar
                progress={clampedProgress}
                showPercentage={false}
              />
                  {totalCount > 0 && currentIndex >= 0 && (
                <p className="text-xs text-gray-500 text-center mt-2">
                  {currentAdNumber} of {totalCount} ads completed
                </p>
              )}
            </div>

            {/* Success State */}
            {isComplete && (
              <div className="mt-4 p-4 bg-gradient-to-r from-green-50 to-emerald-50 border-2 border-green-200 rounded-xl animate-scale-in">
                <div className="flex items-center space-x-3">
                  <CheckCircle2 className="h-6 w-6 text-green-600 flex-shrink-0" />
                  <div>
                    <p className="text-sm font-semibold text-green-900">
                      Batch generation completed successfully!
                    </p>
                    <p className="text-xs text-green-700 mt-0.5">
                      {totalCount > 0 ? `${totalCount} ads are ready!` : "All ads are ready to use"}
                    </p>
                  </div>
                </div>
              </div>
            )}
          </div>
        </CardContent>
      </Card>
    </div>
  );
};