"use client";

import React from 'react';
import { 
  ChartBarIcon, 
  ExclamationTriangleIcon 
} from '@heroicons/react/24/outline';

export interface SimUsage {
  account: string;
  todayUsageKb: number;
  todayUsageMb: number;
  recentDaysUsage: Array<{
    date: string;
    usageKb: number;
    usageMb: number;
  }>;
  isBlacklisted: boolean;
}

interface DataUsageChartProps {
  usage: SimUsage;
  remainingQuotaMb: number;
  isLoading?: boolean;
  error?: string | null;
  embedded?: boolean; // when true, render content without card container
}

export function DataUsageChart({ usage, remainingQuotaMb, isLoading, error, embedded = false }: DataUsageChartProps) {
  const formatUsage = (usageMb: number) => {
    if (usageMb >= 1024) {
      return `${(usageMb / 1024).toFixed(1)} GB`;
    }
    return `${usageMb.toFixed(0)} MB`;
  };

  const getUsageColor = (percentage: number) => {
    if (percentage >= 90) return 'bg-red-500';
    if (percentage >= 75) return 'bg-yellow-500';
    if (percentage >= 50) return 'bg-orange-500';
    return 'bg-green-500';
  };

  const getUsageTextColor = (percentage: number) => {
    if (percentage >= 90) return 'text-red-600';
    if (percentage >= 75) return 'text-yellow-600';
    if (percentage >= 50) return 'text-orange-600';
    return 'text-green-600';
  };

  if (isLoading) {
    return (
      <div className={`${embedded ? '' : 'bg-white shadow rounded-lg '}p-6`}>
        <div className="animate-pulse">
          <div className="h-6 bg-gray-200 rounded w-1/3 mb-4"></div>
          <div className="h-4 bg-gray-200 rounded w-full mb-2"></div>
          <div className="h-8 bg-gray-200 rounded mb-4"></div>
          <div className="space-y-2">
            <div className="h-4 bg-gray-200 rounded w-3/4"></div>
            <div className="h-4 bg-gray-200 rounded w-1/2"></div>
          </div>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className={`${embedded ? '' : 'bg-white shadow rounded-lg '}p-6`}>
        <div className="text-center">
          <ExclamationTriangleIcon className="h-12 w-12 text-red-400 mx-auto mb-4" />
          <h3 className="text-lg font-medium text-gray-900 mb-2">Error Loading Usage Data</h3>
          <p className="text-red-600">{error}</p>
        </div>
      </div>
    );
  }

  // Calculate total usage from recent days (assume it includes today)
  const totalRecentUsage = usage.recentDaysUsage.reduce((sum, day) => sum + day.usageMb, 0) + usage.todayUsageMb;
  const totalQuota = remainingQuotaMb + totalRecentUsage;
  const usagePercentage = totalQuota > 0 ? (totalRecentUsage / totalQuota) * 100 : 0;

  return (
    <div className={`${embedded ? '' : 'bg-white shadow-lg rounded-xl border border-gray-100 hover:shadow-xl transition-shadow duration-300'}`}>
      {/* Header */}
      <div className={`${embedded ? '' : 'px-6 lg:px-8 py-5 border-b border-gray-200'}`}>
        <div className="flex items-center">
          <div className="bg-blue-50 rounded-xl p-2 mr-4">
            <ChartBarIcon className="h-6 w-6 text-blue-600" />
          </div>
          <div>
            <h3 className="text-xl font-semibold text-gray-900">Data Usage</h3>
            <p className="text-sm text-gray-600">Current month usage and remaining quota</p>
          </div>
        </div>
      </div>

      {/* Content */}
      <div className={`${embedded ? '' : 'px-6 lg:px-8 py-6'}`}>
        {/* Current Usage Overview */}
        <div className="mb-6">
          <div className="flex justify-between items-center mb-2">
            <span className="text-sm font-medium text-gray-700">Used this month</span>
            <span className={`text-sm font-semibold ${getUsageTextColor(usagePercentage)}`}>
              {formatUsage(totalRecentUsage)} of {formatUsage(totalQuota)}
            </span>
          </div>
          
          {/* Progress Bar */}
          <div className="w-full bg-gray-200 rounded-full h-3">
            <div 
              className={`h-3 rounded-full transition-all duration-300 ${getUsageColor(usagePercentage)}`}
              style={{ width: `${Math.min(usagePercentage, 100)}%` }}
            ></div>
          </div>
          
          <div className="flex justify-between text-xs text-gray-500 mt-1">
            <span>0%</span>
            <span className={getUsageTextColor(usagePercentage)}>
              {usagePercentage.toFixed(1)}% used
            </span>
            <span>100%</span>
          </div>
        </div>

        {/* Today's Usage */}
        <div className="grid grid-cols-1 sm:grid-cols-2 gap-4 mb-8">
          <div className="bg-gradient-to-br from-blue-50 to-blue-100 rounded-xl p-6 border border-blue-200">
            <div className="flex items-center justify-between">
              <div>
                <div className="text-3xl font-bold text-blue-600">
                  {formatUsage(usage.todayUsageMb)}
                </div>
                <div className="text-sm font-medium text-blue-700 mt-1">Used today</div>
              </div>
              <div className="bg-blue-200 rounded-full p-3">
                <svg className="h-6 w-6 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 7h8m0 0v8m0-8l-8 8-4-4-6 6" />
                </svg>
              </div>
            </div>
          </div>
          
          <div className="bg-gradient-to-br from-green-50 to-green-100 rounded-xl p-6 border border-green-200">
            <div className="flex items-center justify-between">
              <div>
                <div className="text-3xl font-bold text-green-600">
                  {formatUsage(remainingQuotaMb)}
                </div>
                <div className="text-sm font-medium text-green-700 mt-1">Remaining</div>
              </div>
              <div className="bg-green-200 rounded-full p-3">
                <svg className="h-6 w-6 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20 12H4m16 0l-4 4m4-4l-4-4" />
                </svg>
              </div>
            </div>
          </div>
        </div>

        {/* Recent Days Usage */}
        {usage.recentDaysUsage.length > 0 && (
          <div>
            <h4 className="text-sm font-medium text-gray-500 uppercase tracking-wider mb-3">
              Recent Usage History
            </h4>
            <div className="space-y-2">
              {usage.recentDaysUsage.slice(0, 5).map((day, index) => {
                const dayPercentage = totalQuota > 0 ? (day.usageMb / totalQuota) * 100 : 0;
                return (
                  <div key={index} className="flex items-center justify-between py-2">
                    <span className="text-sm text-gray-600">
                      {new Date(day.date).toLocaleDateString('en-US', {
                        month: 'short',
                        day: 'numeric',
                      })}
                    </span>
                    <div className="flex items-center space-x-3">
                      <div className="w-24 bg-gray-200 rounded-full h-2">
                        <div 
                          className="bg-blue-500 h-2 rounded-full transition-all duration-300"
                          style={{ width: `${Math.min(dayPercentage, 100)}%` }}
                        ></div>
                      </div>
                      <span className="text-sm font-medium text-gray-900 w-16 text-right">
                        {formatUsage(day.usageMb)}
                      </span>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        )}

        {/* Warnings */}
        {usage.isBlacklisted && (
          <div className="mt-6 bg-red-50 border border-red-200 rounded-lg p-4">
            <div className="flex items-center">
              <ExclamationTriangleIcon className="h-5 w-5 text-red-500 mr-2" />
              <div>
                <h4 className="text-sm font-medium text-red-800">Service Restricted</h4>
                <p className="text-sm text-red-700 mt-1">
                  This SIM is currently blacklisted. Please contact support for assistance.
                </p>
              </div>
            </div>
          </div>
        )}

        {usagePercentage >= 90 && (
          <div className="mt-6 bg-red-50 border border-red-200 rounded-lg p-4">
            <div className="flex items-center">
              <ExclamationTriangleIcon className="h-5 w-5 text-red-500 mr-2" />
              <div>
                <h4 className="text-sm font-medium text-red-800">High Usage Warning</h4>
                <p className="text-sm text-red-700 mt-1">
                  You've used {usagePercentage.toFixed(1)}% of your data quota. Consider topping up to avoid service interruption.
                </p>
              </div>
            </div>
          </div>
        )}

        {usagePercentage >= 75 && usagePercentage < 90 && (
          <div className="mt-6 bg-yellow-50 border border-yellow-200 rounded-lg p-4">
            <div className="flex items-center">
              <ExclamationTriangleIcon className="h-5 w-5 text-yellow-500 mr-2" />
              <div>
                <h4 className="text-sm font-medium text-yellow-800">Usage Notice</h4>
                <p className="text-sm text-yellow-700 mt-1">
                  You've used {usagePercentage.toFixed(1)}% of your data quota. Consider monitoring your usage.
                </p>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}