@extends('layouts.portal')

@section('title', 'Will Version History - ' . $will->client->full_name)

@section('page_title', 'Will Version History')

@section('page_subtitle', 'Track all updates to ' . $will->client->full_name . '\'s Will #' . $will->id)

@section('sidebar')
    @include('admin.partials.sidebar', ['active' => 'wills'])
@endsection

@section('content')
<div class="p-6 space-y-6">
    
    <!-- Header Card -->
    <div class="bg-gradient-to-r from-blue-600 to-indigo-600 rounded-xl shadow-lg p-6 text-white">
        <div class="flex items-center justify-between">
            <div>
                <h1 class="text-3xl font-bold mb-2">Will Version History</h1>
                <p class="text-blue-100">
                    <i class="fas fa-file mr-2"></i>Will ID: #{{ $will->id }} | 
                    <i class="fas fa-user mr-2"></i>{{ $will->client->full_name }} | 
                    <span class="px-2 py-1 bg-blue-500 rounded-full text-sm font-semibold">
                        <i class="fas fa-code-branch mr-1"></i>v{{ $will->version ?? 1 }}
                    </span>
                </p>
            </div>
            <a href="{{ route('admin.wills.show', $will) }}" class="px-4 py-2 bg-white text-blue-600 rounded-lg font-medium hover:bg-blue-50 transition">
                <i class="fas fa-arrow-left mr-2"></i>Back to Will
            </a>
        </div>
    </div>

    <!-- Stats Row -->
    <div class="grid grid-cols-1 md:grid-cols-4 gap-4">
        <div class="bg-white rounded-lg shadow p-4 border-l-4 border-blue-600">
            <p class="text-sm text-gray-600 font-semibold">Current Version</p>
            <p class="text-3xl font-bold text-gray-900 mt-1">{{ $will->version ?? 1 }}</p>
        </div>
        <div class="bg-white rounded-lg shadow p-4 border-l-4 border-green-600">
            <p class="text-sm text-gray-600 font-semibold">Total Updates</p>
            <p class="text-3xl font-bold text-gray-900 mt-1">{{ $versionHistory->count() }}</p>
        </div>
        <div class="bg-white rounded-lg shadow p-4 border-l-4 border-purple-600">
            <p class="text-sm text-gray-600 font-semibold">Last Updated</p>
            <p class="text-lg font-bold text-gray-900 mt-1">
                {{ $will->updated_at->format('M d, Y') }}
            </p>
        </div>
        <div class="bg-white rounded-lg shadow p-4 border-l-4 border-orange-600">
            <p class="text-sm text-gray-600 font-semibold">Updated By</p>
            <p class="text-lg font-bold text-gray-900 mt-1">
                {{ $currentVersion->getRoleLabel() ?? 'N/A' }}
            </p>
        </div>
    </div>

    <!-- Version Timeline -->
    <div class="bg-white rounded-xl shadow-lg p-6 border border-gray-200">
        <h2 class="text-2xl font-bold text-gray-900 mb-6 flex items-center">
            <i class="fas fa-history mr-3 text-blue-600"></i>Version Timeline
        </h2>

        @if($versionHistory->count() > 0)
            <div class="relative">
                <!-- Timeline line -->
                <div class="absolute left-5 top-0 bottom-0 w-1 bg-gradient-to-b from-blue-600 to-indigo-600"></div>

                <!-- Timeline items -->
                <div class="space-y-6 pl-16">
                    @foreach($versionHistory as $index => $version)
                    <div class="relative">
                        <!-- Timeline dot -->
                        <div class="absolute -left-12 top-1 w-10 h-10 bg-white border-4 border-blue-600 rounded-full flex items-center justify-center shadow-md">
                            <span class="text-xs font-bold text-blue-600">v{{ $version->version_number }}</span>
                        </div>

                        <!-- Version card -->
                        <div class="bg-gradient-to-br from-gray-50 to-blue-50 rounded-lg border border-gray-200 p-6 hover:shadow-lg transition" data-version-id="{{ $version->id }}" data-version-number="{{ $version->version_number }}">
                            
                            <!-- Header -->
                            <div class="flex items-center justify-between mb-4">
                                <div>
                                    <h3 class="text-lg font-bold text-gray-900">
                                        Version {{ $version->version_number }}
                                        @if($index === 0)
                                        <span class="ml-2 px-3 py-1 bg-green-100 text-green-800 text-xs font-semibold rounded-full">
                                            <i class="fas fa-star mr-1"></i>Current
                                        </span>
                                        @endif
                                    </h3>
                                </div>
                                <span class="text-xs px-3 py-1 font-semibold rounded-full {{ 
                                    $version->updated_by_role === 'client' ? 'bg-purple-100 text-purple-700' :
                                    ($version->updated_by_role === 'agent' ? 'bg-green-100 text-green-700' :
                                    ($version->updated_by_role === 'lawyer' ? 'bg-blue-100 text-blue-700' :
                                    ($version->updated_by_role === 'admin' ? 'bg-red-100 text-red-700' :
                                    'bg-gray-100 text-gray-700'))) 
                                }}">
                                    {{ $version->getRoleLabel() }}
                                </span>
                            </div>

                            <!-- Sections grid -->
                            @if($version->sections_json && is_array($version->sections_json) && count($version->sections_json) > 0)
                            <div class="mb-4">
                                <p class="text-xs font-semibold text-gray-600 mb-2">Sections Updated:</p>
                                <div class="flex flex-wrap gap-2">
                                    @foreach($version->sections_json as $section)
                                    <span class="px-3 py-1 text-xs font-semibold rounded-full bg-white border-2 border-green-300 text-green-700">
                                        <i class="fas fa-check-circle mr-1"></i>{{ ucfirst(str_replace('_', ' ', $section)) }}
                                    </span>
                                    @endforeach
                                </div>
                            </div>
                            @endif

                            <!-- Summary -->
                            @if($version->changes_summary)
                            <div class="mb-4 p-3 bg-white rounded border border-gray-300">
                                <p class="text-sm text-gray-700">
                                    <strong>Summary:</strong> {{ $version->changes_summary }}
                                </p>
                            </div>
                            @endif

                            <!-- Meta info -->
                            <div class="grid grid-cols-1 md:grid-cols-3 gap-4 text-sm">
                                <div>
                                    <p class="text-gray-600 text-xs font-semibold">Updated At</p>
                                    <p class="text-gray-900 font-medium">{{ $version->created_at->format('d M Y, g:i A') }}</p>
                                </div>
                                <div>
                                    <p class="text-gray-600 text-xs font-semibold">Updated By</p>
                                    @if($version->updatedByUser)
                                    <p class="text-gray-900 font-medium">{{ $version->updatedByUser->name ?? 'N/A' }}</p>
                                    @else
                                    <p class="text-gray-500 italic">System</p>
                                    @endif
                                </div>
                                <div>
                                    <p class="text-gray-600 text-xs font-semibold">Status</p>
                                    <span class="px-2 py-1 text-xs font-semibold rounded-full {{ $version->status === 'active' ? 'bg-green-100 text-green-800' : 'bg-gray-100 text-gray-800' }}">
                                        {{ ucfirst($version->status) }}
                                    </span>
                                </div>
                            </div>

                            <!-- Actions -->
                            <div class="mt-4 flex gap-2">
                                <button onclick="viewVersionDetails({{ $version->id }})" class="px-3 py-2 text-sm bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition">
                                    <i class="fas fa-eye mr-1"></i>View Details
                                </button>
                                @if($index > 0)
                                <button onclick="compareVersions({{ $version->version_number }}, {{ $versionHistory->first()->version_number }})" class="px-3 py-2 text-sm bg-purple-600 text-white rounded-lg hover:bg-purple-700 transition">
                                    <i class="fas fa-exchange-alt mr-1"></i>Compare
                                </button>
                                @endif
                            </div>
                        </div>
                    </div>
                    @endforeach
                </div>
            </div>
        @else
            <div class="text-center py-12">
                <i class="fas fa-inbox text-gray-300 text-5xl mb-4 block"></i>
                <p class="text-gray-500">No version history available</p>
            </div>
        @endif
    </div>

    <!-- Legend -->
    <div class="bg-blue-50 border border-blue-200 rounded-lg p-4">
        <h3 class="font-bold text-blue-900 mb-3">Legend</h3>
        <div class="grid grid-cols-2 md:grid-cols-5 gap-4 text-sm">
            <div class="flex items-center gap-2">
                <span class="px-2 py-1 bg-purple-100 text-purple-700 rounded text-xs font-semibold">👤 Client</span>
            </div>
            <div class="flex items-center gap-2">
                <span class="px-2 py-1 bg-green-100 text-green-700 rounded text-xs font-semibold">🤝 Agent</span>
            </div>
            <div class="flex items-center gap-2">
                <span class="px-2 py-1 bg-blue-100 text-blue-700 rounded text-xs font-semibold">⚖️ Lawyer</span>
            </div>
            <div class="flex items-center gap-2">
                <span class="px-2 py-1 bg-red-100 text-red-700 rounded text-xs font-semibold">🔧 Admin</span>
            </div>
            <div class="flex items-center gap-2">
                <span class="px-2 py-1 bg-green-100 text-green-800 rounded text-xs font-semibold">✓ Current</span>
            </div>
        </div>
    </div>

</div>

<!-- Comparison Modal -->
<div id="comparisonModal" class="hidden fixed inset-0 bg-black bg-opacity-50 z-50 overflow-y-auto">
    <div class="min-h-screen flex items-center justify-center p-4">
        <div class="bg-white rounded-xl shadow-2xl max-w-6xl w-full max-h-[90vh] overflow-hidden flex flex-col">
            <!-- Modal Header -->
            <div class="bg-gradient-to-r from-purple-600 to-indigo-600 text-white px-6 py-4 flex items-center justify-between">
                <h2 class="text-2xl font-bold flex items-center gap-3">
                    <i class="fas fa-exchange-alt"></i>
                    <span>Version Comparison</span>
                </h2>
                <button onclick="closeComparisonModal()" class="text-2xl hover:text-purple-100 transition">&times;</button>
            </div>

            <!-- Loading State -->
            <div id="comparisonLoading" class="hidden flex items-center justify-center py-12">
                <div class="text-center">
                    <div class="inline-block">
                        <div class="w-12 h-12 border-4 border-purple-200 border-t-purple-600 rounded-full animate-spin"></div>
                    </div>
                    <p class="mt-4 text-gray-600 font-semibold">Loading comparison...</p>
                </div>
            </div>

            <!-- Modal Body -->
            <div id="comparisonContent" class="overflow-y-auto flex-1 px-6 py-6">
                <!-- Will be populated by JavaScript -->
            </div>

            <!-- Modal Footer -->
            <div class="border-t border-gray-200 bg-gray-50 px-6 py-4 flex gap-3 justify-end">
                <button onclick="closeComparisonModal()" class="px-4 py-2 bg-gray-300 text-gray-800 rounded-lg font-medium hover:bg-gray-400 transition">
                    Close
                </button>
                <button onclick="exportComparison()" class="px-4 py-2 bg-blue-600 text-white rounded-lg font-medium hover:bg-blue-700 transition">
                    <i class="fas fa-download mr-2"></i>Export
                </button>
            </div>
        </div>
    </div>
</div>

<script>
const versions = {!! json_encode($versionHistory->map(fn($v) => [
    'id' => $v->id,
    'version_number' => $v->version_number,
    'created_at' => $v->created_at->format('d M Y, g:i A'),
    'updated_by_role' => $v->updated_by_role,
    'updated_by_name' => $v->updatedByUser?->name ?? 'System',
    'sections_json' => $v->sections_json,
    'changes_summary' => $v->changes_summary,
])->keyBy('version_number')) !!};

function viewVersionDetails(versionId) {
    const versionElement = event.target.closest('[data-version-id]');
    if (versionElement) {
        const versionNumber = versionElement.getAttribute('data-version-number');
        const willId = {{ $will->id }};
        window.location.href = `/admin/wills/${willId}/version/${versionNumber}`;
    }
}

async function compareVersions(olderVersion, newerVersion) {
    const willId = {{ $will->id }};
    
    showComparisonLoading();
    openComparisonModal();

    try {
        const response = await fetch(`/admin/wills/${willId}/compare-versions?from=${olderVersion}&to=${newerVersion}`);
        if (!response.ok) throw new Error('Failed to fetch comparison');
        
        const data = await response.json();
        renderComparison(data, olderVersion, newerVersion);
    } catch (error) {
        console.error('Error:', error);
        document.getElementById('comparisonContent').innerHTML = `
            <div class="text-center py-12 text-red-600">
                <i class="fas fa-exclamation-circle text-3xl mb-3 block"></i>
                <p>Error loading comparison. Please try again.</p>
            </div>
        `;
    }
}

function renderComparison(data, v1, v2) {
    const content = document.getElementById('comparisonContent');
    const v1Info = versions[v1] || {};
    const v2Info = versions[v2] || {};

    let html = `
        <div class="mb-6 grid grid-cols-1 md:grid-cols-2 gap-4">
            <!-- Version 1 -->
            <div class="bg-red-50 border-2 border-red-300 rounded-lg p-4">
                <h3 class="text-lg font-bold text-red-900 mb-2">
                    <i class="fas fa-arrow-left mr-2"></i>Version ${v1}
                </h3>
                <div class="text-sm text-gray-700 space-y-1">
                    <p><strong>Updated:</strong> ${v1Info.created_at}</p>
                    <p><strong>By:</strong> ${v1Info.updated_by_name} (${v1Info.updated_by_role})</p>
                    ${v1Info.changes_summary ? `<p><strong>Summary:</strong> ${v1Info.changes_summary}</p>` : ''}
                </div>
            </div>
            
            <!-- Version 2 -->
            <div class="bg-green-50 border-2 border-green-300 rounded-lg p-4">
                <h3 class="text-lg font-bold text-green-900 mb-2">
                    <i class="fas fa-arrow-right mr-2"></i>Version ${v2}
                </h3>
                <div class="text-sm text-gray-700 space-y-1">
                    <p><strong>Updated:</strong> ${v2Info.created_at}</p>
                    <p><strong>By:</strong> ${v2Info.updated_by_name} (${v2Info.updated_by_role})</p>
                    ${v2Info.changes_summary ? `<p><strong>Summary:</strong> ${v2Info.changes_summary}</p>` : ''}
                </div>
            </div>
        </div>

        <hr class="my-6">
    `;

    if (data.changes && Object.keys(data.changes).length > 0) {
        html += '<h3 class="text-xl font-bold text-gray-900 mb-4"><i class="fas fa-list mr-2"></i>Changes</h3>';
        html += '<div class="space-y-4">';

        Object.entries(data.changes).forEach(([field, change]) => {
            const oldVal = formatValue(change.old);
            const newVal = formatValue(change.new);

            html += `
                <div class="border border-gray-300 rounded-lg overflow-hidden">
                    <div class="bg-gray-100 px-4 py-3 font-semibold text-gray-900 flex items-center gap-2">
                        <i class="fas fa-edit text-blue-600"></i>
                        ${field}
                    </div>
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-0">
                        <div class="bg-red-50 border-r border-gray-300 p-4">
                            <p class="text-xs font-bold text-red-700 mb-2">OLD VALUE</p>
                            <div class="text-sm text-gray-800 break-words max-h-64 overflow-y-auto">
                                ${oldVal}
                            </div>
                        </div>
                        <div class="bg-green-50 p-4">
                            <p class="text-xs font-bold text-green-700 mb-2">NEW VALUE</p>
                            <div class="text-sm text-gray-800 break-words max-h-64 overflow-y-auto">
                                ${newVal}
                            </div>
                        </div>
                    </div>
                </div>
            `;
        });

        html += '</div>';
    } else {
        html += `
            <div class="text-center py-12 text-gray-500">
                <i class="fas fa-equals text-3xl mb-3 block"></i>
                <p>No differences found between these versions</p>
            </div>
        `;
    }

    hideComparisonLoading();
    content.innerHTML = html;
}

function formatValue(value) {
    if (value === null || value === undefined) {
        return '<span class="text-gray-400 italic">Empty</span>';
    }
    if (typeof value === 'boolean') {
        return value ? '<span class="px-2 py-1 bg-green-200 rounded text-xs font-semibold">Yes</span>' 
                     : '<span class="px-2 py-1 bg-red-200 rounded text-xs font-semibold">No</span>';
    }
    if (typeof value === 'object') {
        return `<pre class="bg-white p-3 rounded border border-gray-300 text-xs overflow-auto">${escapeHtml(JSON.stringify(value, null, 2))}</pre>`;
    }
    return `<span>${escapeHtml(String(value))}</span>`;
}

function escapeHtml(text) {
    const map = {
        '&': '&amp;',
        '<': '&lt;',
        '>': '&gt;',
        '"': '&quot;',
        "'": '&#039;'
    };
    return text.replace(/[&<>"']/g, m => map[m]);
}

function openComparisonModal() {
    document.getElementById('comparisonModal').classList.remove('hidden');
    document.body.style.overflow = 'hidden';
}

function closeComparisonModal() {
    document.getElementById('comparisonModal').classList.add('hidden');
    document.body.style.overflow = 'auto';
}

function showComparisonLoading() {
    document.getElementById('comparisonLoading').classList.remove('hidden');
    document.getElementById('comparisonContent').innerHTML = '';
}

function hideComparisonLoading() {
    document.getElementById('comparisonLoading').classList.add('hidden');
}

function exportComparison() {
    const content = document.getElementById('comparisonContent').innerText;
    const element = document.createElement('a');
    element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(content));
    element.setAttribute('download', `will-comparison-${Date.now()}.txt`);
    element.style.display = 'none';
    document.body.appendChild(element);
    element.click();
    document.body.removeChild(element);
}

// Close modal when clicking outside
document.addEventListener('click', function(event) {
    const modal = document.getElementById('comparisonModal');
    if (event.target === modal) {
        closeComparisonModal();
    }
});

// Close modal on Escape key
document.addEventListener('keydown', function(event) {
    if (event.key === 'Escape') {
        closeComparisonModal();
    }
});
</script>
@endsection