'use client';

import { useRef, useEffect, useState } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Paperclip, X } from 'lucide-react';
import { Textarea } from '@/components/ui/textarea';
import { decodeComposeContent, encodeComposeContent } from '@/lib/compose-mime-decoder';
import { Email } from '@/app/courrier/page';

interface ComposeEmailProps {
  showCompose: boolean;
  setShowCompose: (show: boolean) => void;
  composeTo: string;
  setComposeTo: (to: string) => void;
  composeCc: string;
  setComposeCc: (cc: string) => void;
  composeBcc: string;
  setComposeBcc: (bcc: string) => void;
  composeSubject: string;
  setComposeSubject: (subject: string) => void;
  composeBody: string;
  setComposeBody: (body: string) => void;
  showCc: boolean;
  setShowCc: (show: boolean) => void;
  showBcc: boolean;
  setShowBcc: (show: boolean) => void;
  attachments: any[];
  setAttachments: (attachments: any[]) => void;
  handleSend: () => Promise<void>;
  originalEmail?: {
    content: string;
    type: 'reply' | 'reply-all' | 'forward';
  };
  onSend: (email: Email) => void;
  onCancel: () => void;
  onBodyChange?: (body: string) => void;
  initialTo?: string;
  initialSubject?: string;
  initialBody?: string;
  initialCc?: string;
  initialBcc?: string;
  replyTo?: Email | null;
  forwardFrom?: Email | null;
}

export default function ComposeEmail({
  showCompose,
  setShowCompose,
  composeTo,
  setComposeTo,
  composeCc,
  setComposeCc,
  composeBcc,
  setComposeBcc,
  composeSubject,
  setComposeSubject,
  composeBody,
  setComposeBody,
  showCc,
  setShowCc,
  showBcc,
  setShowBcc,
  attachments,
  setAttachments,
  handleSend,
  originalEmail,
  onSend,
  onCancel,
  onBodyChange,
  initialTo,
  initialSubject,
  initialBody,
  initialCc,
  initialBcc,
  replyTo,
  forwardFrom
}: ComposeEmailProps) {
  const composeBodyRef = useRef<HTMLDivElement>(null);
  const [localContent, setLocalContent] = useState('');
  
  useEffect(() => {
    if (composeBodyRef.current) {
      // Initialize the content structure
      const originalContent = replyTo || forwardFrom ? `
        <div id="new-reply-area" dir="ltr" style="margin-bottom: 20px; min-height: 40px;"></div>
        <div id="original-email" dir="ltr" style="border-top: 1px solid #e0e0e0; padding-top: 10px; color: #555;">
          ${composeBody}
        </div>
      ` : composeBody;

      composeBodyRef.current.innerHTML = originalContent;
      
      // Place cursor at the beginning of new reply area
      const newReplyArea = composeBodyRef.current.querySelector('#new-reply-area');
      if (newReplyArea) {
        const range = document.createRange();
        const sel = window.getSelection();
        range.setStart(newReplyArea, 0);
        range.collapse(true);
        sel?.removeAllRanges();
        sel?.addRange(range);
      }
    }
  }, [composeBody, replyTo, forwardFrom]);

  // Modified input handler to prevent nested structures
  const handleInput = (e: React.FormEvent<HTMLDivElement>) => {
    if (!composeBodyRef.current) return;

    // Get the new reply content
    const newReplyArea = composeBodyRef.current.querySelector('#new-reply-area');
    const originalEmailArea = composeBodyRef.current.querySelector('#original-email');
    
    if (!newReplyArea || !originalEmailArea) return;

    const newReplyContent = newReplyArea.innerHTML;
    const originalContent = originalEmailArea.innerHTML;

    // Update local state
    setComposeBody(newReplyContent);

    // Combine both contents while maintaining formatting
    const formattedContent = `
      <div id="new-reply-area" dir="ltr" style="margin-bottom: 20px; min-height: 40px;">
        ${newReplyContent}
      </div>
      <div id="original-email" dir="ltr" style="border-top: 1px solid #e0e0e0; padding-top: 10px; color: #555;">
        ${originalContent}
      </div>
    `;

    // Update the compose form
    if (onBodyChange) {
      onBodyChange(formattedContent);
    }
  };

  const handleFileAttachment = async (e: React.ChangeEvent<HTMLInputElement>) => {
    if (!e.target.files) return;
    
    const newAttachments: any[] = [];
    const MAX_FILE_SIZE = 10 * 1024 * 1024; // 10MB in bytes
    const oversizedFiles: string[] = [];
    
    for (const file of e.target.files) {
      if (file.size > MAX_FILE_SIZE) {
        oversizedFiles.push(file.name);
        continue;
      }

      try {
        // Read file as base64
        const base64Content = await new Promise<string>((resolve) => {
          const reader = new FileReader();
          reader.onloadend = () => {
            const base64 = reader.result as string;
            resolve(base64.split(',')[1]); // Remove data URL prefix
          };
          reader.readAsDataURL(file);
        });

        newAttachments.push({
          name: file.name,
          type: file.type,
          content: base64Content,
          encoding: 'base64'
        });
      } catch (error) {
        console.error('Error processing attachment:', error);
      }
    }

    if (oversizedFiles.length > 0) {
      alert(`The following files exceed the 10MB size limit and were not attached:\n${oversizedFiles.join('\n')}`);
    }

    if (newAttachments.length > 0) {
      setAttachments([...attachments, ...newAttachments]);
    }
  };

  if (!showCompose) return null;

  return (
    <div className="fixed inset-0 bg-gray-600/30 backdrop-blur-sm z-50 flex items-center justify-center">
      <div className="w-full max-w-2xl h-[90vh] bg-white rounded-xl shadow-xl flex flex-col mx-4">
        {/* Modal Header */}
        <div className="flex-none flex items-center justify-between px-6 py-3 border-b border-gray-200">
          <h3 className="text-lg font-semibold text-gray-900">
            {replyTo ? 'Reply' : forwardFrom ? 'Forward' : 'New Message'}
          </h3>
          <Button
            variant="ghost"
            size="icon"
            className="hover:bg-gray-100 rounded-full"
            onClick={onCancel}
          >
            <X className="h-5 w-5 text-gray-500" />
          </Button>
        </div>

        {/* Modal Body */}
        <div className="flex-1 overflow-hidden">
          <div className="h-full flex flex-col p-6 space-y-4 overflow-y-auto">
            {/* To Field */}
            <div className="flex-none">
              <Label htmlFor="to" className="block text-sm font-medium text-gray-700">To</Label>
              <Input
                id="to"
                value={composeTo}
                onChange={(e) => setComposeTo(e.target.value)}
                placeholder="recipient@example.com"
                className="w-full mt-1 bg-white border-gray-300 text-gray-900"
              />
            </div>

            {/* CC/BCC Toggle Buttons */}
            <div className="flex-none flex items-center gap-4">
              <button
                type="button"
                className="text-blue-600 hover:text-blue-700 text-sm font-medium"
                onClick={() => setShowCc(!showCc)}
              >
                {showCc ? 'Hide Cc' : 'Add Cc'}
              </button>
              <button
                type="button"
                className="text-blue-600 hover:text-blue-700 text-sm font-medium"
                onClick={() => setShowBcc(!showBcc)}
              >
                {showBcc ? 'Hide Bcc' : 'Add Bcc'}
              </button>
            </div>

            {/* CC Field */}
            {showCc && (
              <div className="flex-none">
                <Label htmlFor="cc" className="block text-sm font-medium text-gray-700">Cc</Label>
                <Input
                  id="cc"
                  value={composeCc}
                  onChange={(e) => setComposeCc(e.target.value)}
                  placeholder="cc@example.com"
                  className="w-full mt-1 bg-white border-gray-300 text-gray-900"
                />
              </div>
            )}

            {/* BCC Field */}
            {showBcc && (
              <div className="flex-none">
                <Label htmlFor="bcc" className="block text-sm font-medium text-gray-700">Bcc</Label>
                <Input
                  id="bcc"
                  value={composeBcc}
                  onChange={(e) => setComposeBcc(e.target.value)}
                  placeholder="bcc@example.com"
                  className="w-full mt-1 bg-white border-gray-300 text-gray-900"
                />
              </div>
            )}

            {/* Subject Field */}
            <div className="flex-none">
              <Label htmlFor="subject" className="block text-sm font-medium text-gray-700">Subject</Label>
              <Input
                id="subject"
                value={composeSubject}
                onChange={(e) => setComposeSubject(e.target.value)}
                placeholder="Enter subject"
                className="w-full mt-1 bg-white border-gray-300 text-gray-900"
              />
            </div>

            {/* Original Email Content Preview - Move it above the message body */}
            {(replyTo || forwardFrom) && (
              <div className="flex-none border rounded-md p-4 bg-gray-50">
                <div className="flex items-center justify-between mb-2">
                  <h4 className="text-sm font-medium text-gray-700">
                    {forwardFrom ? 'Forwarded Message' : 'Original Message'}
                  </h4>
                </div>
                <div 
                  className="prose max-w-none text-sm text-gray-600"
                  dangerouslySetInnerHTML={{ __html: composeBody }}
                />
              </div>
            )}

            {/* Message Body */}
            <div className="flex-1 min-h-[200px] flex flex-col">
              <Label htmlFor="message" className="flex-none block text-sm font-medium text-gray-700 mb-2">Message</Label>
              <div
                ref={composeBodyRef}
                contentEditable
                onInput={handleInput}
                className="flex-1 w-full bg-white border border-gray-300 rounded-md p-4 text-gray-900 overflow-y-auto focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                style={{ direction: 'ltr' }}
                dir="ltr"
                spellCheck="true"
                role="textbox"
                aria-multiline="true"
                tabIndex={0}
              />
            </div>
          </div>
        </div>

        {/* Modal Footer */}
        <div className="flex-none flex items-center justify-between px-6 py-3 border-t border-gray-200 bg-white">
          <div className="flex items-center gap-2">
            {/* File Input for Attachments */}
            <input
              type="file"
              id="file-attachment"
              className="hidden"
              multiple
              onChange={handleFileAttachment}
            />
            <label htmlFor="file-attachment">
              <Button 
                variant="outline" 
                size="icon"
                className="rounded-full bg-white hover:bg-gray-100 border-gray-300"
                onClick={(e) => {
                  e.preventDefault();
                  document.getElementById('file-attachment')?.click();
                }}
              >
                <Paperclip className="h-4 w-4 text-gray-600" />
              </Button>
            </label>
          </div>
          <div className="flex items-center gap-3">
            <Button 
              variant="ghost"
              className="text-gray-600 hover:text-gray-700 hover:bg-gray-100"
              onClick={onCancel}
            >
              Cancel
            </Button>
            <Button
              className="bg-blue-600 text-white hover:bg-blue-700"
              onClick={handleSend}
            >
              Send
            </Button>
          </div>
        </div>
      </div>
    </div>
  );
} 