@extends('layouts.app')

@section('title', 'Messages')
@section('subtitle', 'Your Conversations')

@section('content')
<div class="max-w-7xl mx-auto">
    <!-- Header -->
    <div class="mb-6">
        <h1 class="text-2xl font-bold text-gray-900">Messages</h1>
        <p class="mt-1 text-sm text-gray-600">Manage your conversations with buyers and sellers</p>
    </div>

    <div class="bg-white rounded-lg shadow">
        <div class="grid grid-cols-1 lg:grid-cols-4 h-[70vh]">
            <!-- Conversations List -->
            <div class="lg:col-span-1 border-r border-gray-200 flex flex-col">
                <div class="p-4 border-b border-gray-200">
                    <h2 class="text-lg font-medium text-gray-900">Conversations</h2>
                </div>
                
                <div class="flex-1 overflow-y-auto" id="conversations-list">
                    @if($chats->count() > 0)
                        <div class="divide-y divide-gray-200">
                            @foreach($chats as $chat)
                                @php
                                    $otherUser = $chat->buyer_id === auth()->id() ? $chat->seller : $chat->buyer;
                                    $unreadCount = $chat->unreadMessages()->count();
                                @endphp
                                <div class="conversation-item cursor-pointer p-4 hover:bg-gray-50 transition-colors duration-200 {{ $activeChat && $activeChat->id === $chat->id ? 'bg-blue-50 border-r-2 border-blue-500' : '' }}" 
                                     data-chat-id="{{ $chat->id }}">
                                    <div class="flex items-start space-x-3">
                                        <!-- User Avatar -->
                                        <div class="flex-shrink-0">
                                            <div class="h-10 w-10 rounded-full bg-green-100 flex items-center justify-center">
                                                <span class="text-green-600 font-medium text-sm">
                                                    {{ strtoupper(substr($otherUser->name, 0, 1)) }}
                                                </span>
                                            </div>
                                        </div>
                                        
                                        <!-- Conversation Details -->
                                        <div class="flex-1 min-w-0">
                                            <div class="flex items-center justify-between">
                                                <p class="text-sm font-medium text-gray-900 truncate">
                                                    {{ $otherUser->name }}
                                                    @if($otherUser->company_name)
                                                        <span class="text-gray-500">({{ $otherUser->company_name }})</span>
                                                    @endif
                                                </p>
                                                @if($chat->last_message_at)
                                                    <span class="text-xs text-gray-500 whitespace-nowrap">
                                                        {{ $chat->last_message_at->diffForHumans() }}
                                                    </span>
                                                @endif
                                            </div>
                                            
                                            <p class="text-sm text-gray-600 truncate mt-1">
                                                @if($chat->last_message)
                                                    {{ Str::limit($chat->last_message, 50) }}
                                                @else
                                                    <span class="text-gray-400">No messages yet</span>
                                                @endif
                                            </p>
                                            
                                            <!-- Product Info -->
                                            <div class="flex items-center mt-2 text-xs text-gray-500">
                                                <svg class="w-3 h-3 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M20 13V6a2 2 0 00-2-2H6a2 2 0 00-2 2v7m16 0v5a2 2 0 01-2 2H6a2 2 0 01-2-2v-5m16 0h-2M4 13h2m8-5V4m0 4a2 2 0 100 4 2 2 0 000-4z"/>
                                                </svg>
                                                {{ Str::limit($chat->product->name, 25) }}
                                            </div>

                                            <!-- Unread Badge -->
                                            @if($unreadCount > 0)
                                                <div class="mt-1">
                                                    <span class="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-red-100 text-red-800 unread-badge">
                                                        {{ $unreadCount }} unread
                                                    </span>
                                                </div>
                                            @endif
                                        </div>
                                    </div>
                                </div>
                            @endforeach
                        </div>
                    @else
                        <div class="text-center py-12">
                            <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                            </svg>
                            <h3 class="mt-2 text-sm font-medium text-gray-900">No conversations</h3>
                            <p class="mt-1 text-sm text-gray-500">
                                Start a conversation from the marketplace.
                            </p>
                        </div>
                    @endif
                </div>
            </div>

            <!-- Chat Area -->
            <div class="lg:col-span-3 flex flex-col">
                @if($activeChat)
                    @php
                        $otherUser = $activeChat->buyer_id === auth()->id() ? $activeChat->seller : $activeChat->buyer;
                    @endphp
                    <!-- Chat Header -->
                    <div class="border-b border-gray-200 p-4">
                        <div class="flex items-center justify-between">
                            <div class="flex items-center space-x-3">
                                <div class="flex-shrink-0">
                                    <div class="h-10 w-10 rounded-full bg-green-100 flex items-center justify-center">
                                        <span class="text-green-600 font-medium text-sm">
                                            {{ strtoupper(substr($otherUser->name, 0, 1)) }}
                                        </span>
                                    </div>
                                </div>
                                <div>
                                    <h3 class="text-lg font-medium text-gray-900" id="chat-user-name">
                                        {{ $otherUser->name }}
                                        @if($otherUser->company_name)
                                            <span class="text-gray-600">({{ $otherUser->company_name }})</span>
                                        @endif
                                    </h3>
                                    <p class="text-sm text-gray-500" id="chat-user-role">
                                        {{ auth()->user()->isBuyer() ? 'Seller' : 'Buyer' }}
                                    </p>
                                </div>
                            </div>
                            
                            <!-- Product Info -->
                            <div class="text-right">
                                <p class="text-sm font-medium text-gray-900">About Product</p>
                                <a href="{{ route('marketplace.show', $activeChat->product) }}" 
                                   class="text-sm text-blue-600 hover:text-blue-500 truncate max-w-xs inline-block" id="chat-product-name">
                                    {{ $activeChat->product->name }}
                                </a>
                                <p class="text-sm text-gray-500" id="chat-product-price">
                                    ${{ number_format($activeChat->product->price, 2) }}
                                </p>
                            </div>
                        </div>
                    </div>

                    <!-- Messages Area -->
                    <div id="messages-container" class="flex-1 overflow-y-auto p-4 space-y-4 bg-gray-50">
                        @if($messages->count() > 0)
                            <div class="space-y-4">
                                @foreach($messages->reverse() as $message)
                                    <div class="flex {{ $message->sender_id === auth()->id() ? 'justify-end' : 'justify-start' }}">
                                        <div class="max-w-xs lg:max-w-md px-4 py-2 rounded-lg {{ $message->sender_id === auth()->id() ? 'bg-blue-600 text-white' : 'bg-white border border-gray-200 text-gray-900' }}">
                                            <p class="text-sm">{{ $message->message }}</p>
                                            <div class="flex items-center justify-between mt-1">
                                                <span class="text-xs {{ $message->sender_id === auth()->id() ? 'text-blue-100' : 'text-gray-500' }}">
                                                    {{ $message->created_at->format('g:i A') }}
                                                </span>
                                                @if($message->sender_id === auth()->id() && $message->is_read)
                                                    <svg class="w-4 h-4 text-blue-300 ml-2" fill="currentColor" viewBox="0 0 20 20">
                                                        <path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"/>
                                                    </svg>
                                                @endif
                                            </div>
                                        </div>
                                    </div>
                                @endforeach
                            </div>
                        @else
                            <div class="text-center py-8">
                                <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                                </svg>
                                <h3 class="mt-2 text-sm font-medium text-gray-900">No messages yet</h3>
                                <p class="mt-1 text-sm text-gray-500">Start the conversation by sending a message.</p>
                            </div>
                        @endif
                    </div>

                    <!-- Message Input -->
                    <div class="border-t border-gray-200 p-4">
                        <form id="message-form" action="{{ route('chats.messages.store', $activeChat) }}" method="POST">
                            @csrf
                            <div class="flex space-x-4">
                                <div class="flex-1">
                                    <input type="text" 
                                           name="message" 
                                           id="message-input"
                                           placeholder="Type your message..."
                                           required
                                           class="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                                           autocomplete="off">
                                </div>
                                <button type="submit"
                                        class="bg-blue-600 hover:bg-blue-700 text-white px-6 py-2 rounded-lg font-medium flex items-center transition-colors">
                                    <svg class="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 19l9 2-9-18-9 18 9-2zm0 0v-8"/>
                                    </svg>
                                    Send
                                </button>
                            </div>
                        </form>
                    </div>
                @else
                    <!-- Default State - No chat selected -->
                    <div class="flex-1 flex items-center justify-center bg-gray-50">
                        <div class="text-center">
                            <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                            </svg>
                            <h3 class="mt-2 text-sm font-medium text-gray-900">Select a conversation</h3>
                            <p class="mt-1 text-sm text-gray-500">
                                Choose a conversation from the list to start messaging.
                            </p>
                        </div>
                    </div>
                @endif
            </div>
        </div>
    </div>
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const messagesContainer = document.getElementById('messages-container');
    const messageForm = document.getElementById('message-form');
    const messageInput = document.getElementById('message-input');
    const conversationItems = document.querySelectorAll('.conversation-item');
    let currentChatId = {{ $activeChat ? $activeChat->id : 'null' }};

    // Scroll to bottom of messages
    function scrollToBottom() {
        if (messagesContainer) {
            messagesContainer.scrollTop = messagesContainer.scrollHeight;
        }
    }

    // Handle conversation item clicks
    conversationItems.forEach(item => {
        item.addEventListener('click', function() {
            const chatId = this.getAttribute('data-chat-id');
            
            // Don't reload if clicking the same chat
            if (chatId === currentChatId) return;
            
            loadChat(chatId, true);
        });
    });

    // Load chat via AJAX
    function loadChat(chatId, showLoading = true) {
        if (showLoading) {
            showLoadingState();
        }
        
        fetch(`/chats/${chatId}/ajax`)
            .then(response => response.json())
            .then(data => {
                if (data.success) {
                    updateChatUI(data);
                    currentChatId = chatId;
                    
                    // Update active state in sidebar
                    updateActiveConversation(chatId);
                    
                    // Clear unread badge for this chat
                    clearUnreadBadge(chatId);
                }
            })
            .catch(error => {
                console.error('Error loading chat:', error);
            });
    }

    // Show loading state (only for manual chat changes)
    function showLoadingState() {
        if (messagesContainer) {
            messagesContainer.innerHTML = `
                <div class="flex items-center justify-center h-full">
                    <div class="text-center">
                        <div class="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600 mx-auto"></div>
                        <p class="mt-2 text-sm text-gray-600">Loading conversation...</p>
                    </div>
                </div>
            `;
        }
    }

    // Update chat UI with new data
    function updateChatUI(data) {
        const chat = data.chat;
        
        // Update header
        document.getElementById('chat-user-name').textContent = chat.other_user.name + (chat.other_user.company_name ? ` (${chat.other_user.company_name})` : '');
        document.getElementById('chat-user-role').textContent = data.is_buyer ? 'Seller' : 'Buyer';
        document.getElementById('chat-product-name').textContent = chat.product.name;
        document.getElementById('chat-product-name').href = chat.product.url;
        document.getElementById('chat-product-price').textContent = `$${parseFloat(chat.product.price).toFixed(2)}`;
        
        // Update messages
        updateMessages(data.messages);
        
        // Update message form action
        if (messageForm) {
            messageForm.action = `/chats/${chat.id}/messages`;
        }
        
        // Scroll to bottom
        scrollToBottom();
    }

    // Update messages in the container
    function updateMessages(messages) {
        if (!messagesContainer) return;
        
        if (messages.length > 0) {
            let messagesHTML = '<div class="space-y-4">';
            
            messages.reverse().forEach(message => {
                const isOwnMessage = message.sender_id === {{ auth()->id() }};
                messagesHTML += `
                    <div class="flex ${isOwnMessage ? 'justify-end' : 'justify-start'}">
                        <div class="max-w-xs lg:max-w-md px-4 py-2 rounded-lg ${isOwnMessage ? 'bg-blue-600 text-white' : 'bg-white border border-gray-200 text-gray-900'}">
                            <p class="text-sm">${message.message}</p>
                            <div class="flex items-center justify-between mt-1">
                                <span class="text-xs ${isOwnMessage ? 'text-blue-100' : 'text-gray-500'}">
                                    ${message.created_at}
                                </span>
                                ${isOwnMessage && message.is_read ? `
                                    <svg class="w-4 h-4 text-blue-300 ml-2" fill="currentColor" viewBox="0 0 20 20">
                                        <path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"/>
                                    </svg>
                                ` : ''}
                            </div>
                        </div>
                    </div>
                `;
            });
            
            messagesHTML += '</div>';
            messagesContainer.innerHTML = messagesHTML;
        } else {
            messagesContainer.innerHTML = `
                <div class="text-center py-8">
                    <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 12h.01M12 12h.01M16 12h.01M21 12c0 4.418-4.03 8-9 8a9.863 9.863 0 01-4.255-.949L3 20l1.395-3.72C3.512 15.042 3 13.574 3 12c0-4.418 4.03-8 9-8s9 3.582 9 8z"/>
                    </svg>
                    <h3 class="mt-2 text-sm font-medium text-gray-900">No messages yet</h3>
                    <p class="mt-1 text-sm text-gray-500">Start the conversation by sending a message.</p>
                </div>
            `;
        }
    }

    // Update active conversation in sidebar
    function updateActiveConversation(chatId) {
        conversationItems.forEach(item => {
            if (item.getAttribute('data-chat-id') === chatId) {
                item.classList.add('bg-blue-50', 'border-r-2', 'border-blue-500');
            } else {
                item.classList.remove('bg-blue-50', 'border-r-2', 'border-blue-500');
            }
        });
    }

    // Clear unread badge for a chat
    function clearUnreadBadge(chatId) {
        const activeItem = document.querySelector(`[data-chat-id="${chatId}"]`);
        if (activeItem) {
            const badge = activeItem.querySelector('.unread-badge');
            if (badge) {
                badge.remove();
            }
        }
    }

    // Handle message form submission
    if (messageForm) {
        messageForm.addEventListener('submit', function(e) {
            e.preventDefault();
            
            const message = messageInput.value.trim();
            if (!message) return;

            // Add temporary message to UI
            addTemporaryMessage(message);
            
            // Clear input
            messageInput.value = '';
            
            // Send message via AJAX
            fetch(this.action, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'X-CSRF-TOKEN': '{{ csrf_token() }}'
                },
                body: JSON.stringify({
                    message: message
                })
            })
            .then(response => response.json())
            .then(data => {
                if (data.success) {
                    // Remove temporary message
                    removeTemporaryMessage();
                    // Reload the current chat to show the new message (without loading state)
                    if (currentChatId) {
                        loadChat(currentChatId, false);
                    }
                }
            })
            .catch(error => {
                console.error('Error sending message:', error);
                removeTemporaryMessage();
                alert('Failed to send message. Please try again.');
            });
        });
    }

    // Add temporary message to UI
    function addTemporaryMessage(message) {
        if (!messagesContainer) return;
        
        const tempId = 'temp-' + Date.now();
        const messageHTML = `
            <div id="${tempId}" class="flex justify-end">
                <div class="max-w-xs lg:max-w-md px-4 py-2 rounded-lg bg-blue-600 text-white opacity-75">
                    <p class="text-sm">${message}</p>
                    <div class="flex items-center justify-between mt-1">
                        <span class="text-xs text-blue-100">Sending...</span>
                    </div>
                </div>
            </div>
        `;
        messagesContainer.innerHTML += messageHTML;
        scrollToBottom();
    }

    // Remove temporary message
    function removeTemporaryMessage() {
        const tempMessages = document.querySelectorAll('[id^="temp-"]');
        tempMessages.forEach(msg => msg.remove());
    }

    // Auto-focus message input
    if (messageInput) {
        messageInput.focus();
    }

    // Scroll to bottom on load
    scrollToBottom();

    // Poll for new messages every 5 seconds (without showing loading state)
    setInterval(() => {
        if (currentChatId) {
            loadChat(currentChatId, false);
        }
    }, 5000);
});
</script>

<style>
.conversation-item {
    transition: all 0.2s ease-in-out;
}

.conversation-item:hover {
    background-color: #f9fafb;
}
</style>
@endsection