<?php // phpcs:ignoreFile
/**
 * Mill Data Comparison - Compare categories across mills
 */

require __DIR__ . '/../session.php';
require __DIR__ . '/../userAccess.php';
require __DIR__ . '/../includes/millnames.php';

// ============================================================================
// Database Configuration
// ============================================================================
$config = [
    'server'   => '192.168.0.16',
    'database' => 'lasucaai',
    'username' => 'lasucaai',
    'password' => 'is413#dfslw',
];

// ============================================================================
// Database Connection
// ============================================================================
function getCompareConnection($config) {
    $connectionOptions = [
        "Database" => $config['database'],
        "Uid" => $config['username'],
        "PWD" => $config['password'],
        "TrustServerCertificate" => true,
        "Encrypt" => false,
    ];
    
    $conn = sqlsrv_connect($config['server'], $connectionOptions);
    return $conn ?: null;
}

// ============================================================================
// Data Queries
// ============================================================================
function getCompareSourceFiles($conn) {
    $sql = "SELECT DISTINCT SourceFileName, 
                   MIN(BeginningDate) as BeginningDate,
                   MAX(EndingDate) as EndingDate,
                   MAX(ProcessedAt) as ProcessedAt
            FROM dbo.MillDataReports 
            GROUP BY SourceFileName
            ORDER BY MAX(ProcessedAt) DESC";
    
    $stmt = sqlsrv_query($conn, $sql);
    $files = [];
    
    if ($stmt) {
        while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
            $files[] = $row;
        }
    }
    
    return $files;
}

function getCompareCategories($conn, $sourceFileName = null) {
    // Get all categories - simpler query that matches working pattern
    $sql = "SELECT DISTINCT Category FROM dbo.MillDataMetrics WHERE Category IS NOT NULL ORDER BY Category";
    $stmt = sqlsrv_query($conn, $sql);
    $categories = [];
    
    if ($stmt) {
        while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
            $categories[] = $row['Category'];
        }
    }
    
    return $categories;
}

function getMillsForCompare($conn, $sourceFileName) {
    $sql = "SELECT ReportId, MillName 
            FROM dbo.MillDataReports 
            WHERE SourceFileName = ?
            ORDER BY MillName";
    
    $stmt = sqlsrv_query($conn, $sql, [$sourceFileName]);
    $mills = [];
    
    if ($stmt) {
        while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
            $mills[] = $row;
        }
    }
    
    return $mills;
}

function getComparisonData($conn, $sourceFileName, $category) {
    // Get all metrics for this category across all mills in this file
    $sql = "SELECT r.MillName, r.ReportId, m.ItemNumber, m.MetricName, 
                   m.RunValue, m.RunValueNumeric, m.ToDateValue, m.ToDateValueNumeric
            FROM dbo.MillDataMetrics m
            JOIN dbo.MillDataReports r ON m.ReportId = r.ReportId
            WHERE r.SourceFileName = ? AND m.Category = ?
            ORDER BY m.ItemNumber, m.MetricName, r.MillName";
    
    $stmt = sqlsrv_query($conn, $sql, [$sourceFileName, $category]);
    $data = [];
    
    if ($stmt) {
        while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
            $data[] = $row;
        }
    }
    
    return $data;
}

function formatCompareDate($date) {
    if ($date instanceof DateTime) {
        return $date->format('m/d/Y');
    }
    return $date ?? '-';
}

// ============================================================================
// Main Logic
// ============================================================================
$conn = getCompareConnection($config);
$connectionError = $conn === null;

$sourceFiles = [];
$categories = [];
$mills = [];
$comparisonData = [];
$pivotedData = [];
$millNameLookup = [];

$selectedFile = isset($_GET['file']) ? trim($_GET['file']) : '';
$selectedCategory = isset($_GET['category']) ? trim($_GET['category']) : '';

if (!$connectionError) {
    // Load mill name mappings
    $millNameLookup = getMillNames($conn);
    
    $sourceFiles = getCompareSourceFiles($conn);
    $categories = getCompareCategories($conn);
    
    // Default to first file
    if (empty($selectedFile) && !empty($sourceFiles)) {
        $selectedFile = $sourceFiles[0]['SourceFileName'];
    }
    
    if (!empty($selectedFile)) {
        $mills = getMillsForCompare($conn, $selectedFile);
        
        // Default to first category
        if (empty($selectedCategory) && !empty($categories)) {
            $selectedCategory = $categories[0];
        }
        
        if (!empty($selectedCategory)) {
            $comparisonData = getComparisonData($conn, $selectedFile, $selectedCategory);
            
            // Pivot data: group by metric, columns are mills
            foreach ($comparisonData as $row) {
                $metricKey = $row['ItemNumber'] . '|' . $row['MetricName'];
                if (!isset($pivotedData[$metricKey])) {
                    $pivotedData[$metricKey] = [
                        'ItemNumber' => $row['ItemNumber'],
                        'MetricName' => $row['MetricName'],
                        'mills' => []
                    ];
                }
                $pivotedData[$metricKey]['mills'][$row['MillName']] = [
                    'RunValue' => $row['RunValue'],
                    'RunValueNumeric' => $row['RunValueNumeric'],
                    'ToDateValue' => $row['ToDateValue'],
                    'ToDateValueNumeric' => $row['ToDateValueNumeric']
                ];
            }
        }
    }
    
    sqlsrv_close($conn);
}

// Get unique mill codes for column headers (raw codes used as data keys)
$millCodes = [];
foreach ($mills as $m) {
    $millCodes[] = $m['MillName'];
}

// Build display names map for headers
$millDisplayNames = [];
foreach ($millCodes as $code) {
    $millDisplayNames[$code] = getMillDisplayName($millNameLookup, $code);
}

// ============================================================================
// Page Layout
// ============================================================================
$pageTitle = 'Mill Comparison';
$pageSubtitle = 'Compare metrics across mills';
$pageDescription = 'Side-by-side comparison of mill production data.';
$layoutWithoutSidebar = true;
$layoutReturnUrl = 'milldata.php';
$layoutReturnLabel = 'Back to Mill Data';
$assetBasePath = '../';

require __DIR__ . '/../includes/layout/header.php';
?>

<style>
.compare-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.compare-control {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.compare-control label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.compare-control select {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: var(--surface);
    color: var(--text);
    min-width: 200px;
}

.compare-table-container {
    background: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow-x: auto;
    max-height: 600px;
    overflow-y: auto;
}

.compare-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.85rem;
}

.compare-table th,
.compare-table td {
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--border);
}

.compare-table th {
    background: var(--surface-alt);
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    white-space: nowrap;
    z-index: 20;
}

/* Sticky first two columns */
.compare-table th.sticky-col,
.compare-table td.sticky-col {
    position: sticky;
    background: var(--surface);
    z-index: 10;
}

.compare-table th.sticky-col {
    background: var(--surface-alt);
    z-index: 30;
}

.compare-table .sticky-col-1 {
    left: 0;
    min-width: 60px;
    max-width: 60px;
}

.compare-table .sticky-col-2 {
    left: 60px;
    min-width: 200px;
    max-width: 250px;
    border-right: 2px solid var(--border);
}

.compare-table th.mill-header {
    text-align: center;
    min-width: 120px;
}

.compare-table th.mill-header .mill-name {
    font-weight: 600;
    color: var(--accent);
}

/* Mill column shading - alternating backgrounds */
.compare-table .mill-col-0 { background-color: rgba(33, 150, 243, 0.08); }
.compare-table .mill-col-1 { background-color: rgba(76, 175, 80, 0.08); }
.compare-table .mill-col-2 { background-color: rgba(156, 39, 176, 0.08); }
.compare-table .mill-col-3 { background-color: rgba(255, 152, 0, 0.08); }
.compare-table .mill-col-4 { background-color: rgba(0, 188, 212, 0.08); }
.compare-table .mill-col-5 { background-color: rgba(233, 30, 99, 0.08); }
.compare-table .mill-col-6 { background-color: rgba(139, 195, 74, 0.08); }
.compare-table .mill-col-7 { background-color: rgba(121, 85, 72, 0.08); }

/* Header shading matches columns */
.compare-table th.mill-col-0 { background-color: rgba(33, 150, 243, 0.15); }
.compare-table th.mill-col-1 { background-color: rgba(76, 175, 80, 0.15); }
.compare-table th.mill-col-2 { background-color: rgba(156, 39, 176, 0.15); }
.compare-table th.mill-col-3 { background-color: rgba(255, 152, 0, 0.15); }
.compare-table th.mill-col-4 { background-color: rgba(0, 188, 212, 0.15); }
.compare-table th.mill-col-5 { background-color: rgba(233, 30, 99, 0.15); }
.compare-table th.mill-col-6 { background-color: rgba(139, 195, 74, 0.15); }
.compare-table th.mill-col-7 { background-color: rgba(121, 85, 72, 0.15); }

.compare-table th.sub-header {
    font-size: 0.75rem;
    font-weight: 500;
    top: 35px;
}

.compare-table tr:hover td {
    background: var(--hover);
}

.compare-table tr:hover td.sticky-col {
    background: var(--hover);
}

.compare-table .item-num {
    font-weight: 600;
    color: var(--accent);
    white-space: nowrap;
}

.compare-table .metric-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.compare-table .value-cell {
    text-align: right;
    font-family: 'Consolas', 'Monaco', monospace;
    white-space: nowrap;
}

.compare-table .value-cell.negative {
    color: #ef5350;
}

.compare-table .value-cell.best {
    background: rgba(76, 175, 80, 0.15);
    font-weight: 600;
}

.compare-table .value-cell.worst {
    background: rgba(244, 67, 54, 0.1);
}

.no-data {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    background: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.compare-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.compare-stat {
    background: var(--surface);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border);
}

.compare-stat .value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent);
}

.compare-stat .label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.view-toggle {
    display: flex;
    gap: 0.5rem;
    margin-left: auto;
}

.view-toggle button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

.view-toggle button.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}
</style>

<div class="app-content">
    <section class="data-panel">
        <?php if ($connectionError): ?>
        <div class="no-data">Unable to connect to the database.</div>
        <?php else: ?>

        <form class="compare-controls" method="get">
            <div class="compare-control">
                <label>Report File</label>
                <select name="file" onchange="this.form.submit()">
                    <?php if (empty($sourceFiles)): ?>
                    <option value="">No reports available</option>
                    <?php else: ?>
                    <?php foreach ($sourceFiles as $file): ?>
                    <option value="<?= htmlspecialchars($file['SourceFileName']) ?>"
                            <?= $file['SourceFileName'] === $selectedFile ? 'selected' : '' ?>>
                        <?= htmlspecialchars($file['SourceFileName']) ?>
                        (<?= formatCompareDate($file['BeginningDate']) ?> - <?= formatCompareDate($file['EndingDate']) ?>)
                    </option>
                    <?php endforeach; ?>
                    <?php endif; ?>
                </select>
            </div>

            <div class="compare-control">
                <label>Category</label>
                <select name="category" onchange="this.form.submit()">
                    <?php if (empty($categories)): ?>
                    <option value="">No categories available</option>
                    <?php else: ?>
                    <?php foreach ($categories as $cat): ?>
                    <option value="<?= htmlspecialchars($cat) ?>"
                            <?= $cat === $selectedCategory ? 'selected' : '' ?>>
                        <?= htmlspecialchars($cat) ?>
                    </option>
                    <?php endforeach; ?>
                    <?php endif; ?>
                </select>
            </div>
        </form>

        <div class="compare-summary">
            <div class="compare-stat">
                <div class="value"><?= count($millCodes) ?></div>
                <div class="label">Mills</div>
            </div>
            <div class="compare-stat">
                <div class="value"><?= count($pivotedData) ?></div>
                <div class="label">Metrics</div>
            </div>
            <div class="compare-stat">
                <div class="value"><?= htmlspecialchars($selectedCategory ?: '-') ?></div>
                <div class="label">Category</div>
            </div>
        </div>

        <?php if (!empty($pivotedData) && !empty($millCodes)): ?>
        <div class="compare-table-container">
            <table class="compare-table">
                <thead>
                    <tr>
                        <th rowspan="2" class="sticky-col sticky-col-1">Item</th>
                        <th rowspan="2" class="sticky-col sticky-col-2">Metric</th>
                        <?php foreach ($millCodes as $idx => $millCode): ?>
                        <th colspan="2" class="mill-header mill-col-<?= $idx % 8 ?>">
                            <span class="mill-name"><?= htmlspecialchars($millDisplayNames[$millCode]) ?></span>
                        </th>
                        <?php endforeach; ?>
                    </tr>
                    <tr>
                        <?php foreach ($millCodes as $idx => $millCode): ?>
                        <th class="sub-header mill-col-<?= $idx % 8 ?>">RUN</th>
                        <th class="sub-header mill-col-<?= $idx % 8 ?>">TO DATE</th>
                        <?php endforeach; ?>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($pivotedData as $metric): ?>
                    <tr>
                        <td class="item-num sticky-col sticky-col-1"><?= htmlspecialchars($metric['ItemNumber'] ?? '') ?></td>
                        <td class="metric-name sticky-col sticky-col-2"><?= htmlspecialchars($metric['MetricName'] ?? '') ?></td>
                        <?php foreach ($millCodes as $idx => $millCode): ?>
                            <?php 
                            $millData = $metric['mills'][$millCode] ?? null;
                            $runValue = $millData['RunValue'] ?? '-';
                            $toDateValue = $millData['ToDateValue'] ?? '-';
                            $runNumeric = $millData['RunValueNumeric'] ?? null;
                            $toDateNumeric = $millData['ToDateValueNumeric'] ?? null;
                            $colClass = 'mill-col-' . ($idx % 8);
                            ?>
                            <td class="value-cell <?= $colClass ?> <?= ($runNumeric ?? 0) < 0 ? 'negative' : '' ?>">
                                <?= htmlspecialchars($runValue) ?>
                            </td>
                            <td class="value-cell <?= $colClass ?> <?= ($toDateNumeric ?? 0) < 0 ? 'negative' : '' ?>">
                                <?= htmlspecialchars($toDateValue) ?>
                            </td>
                        <?php endforeach; ?>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
        <?php else: ?>
        <div class="no-data">
            <p>No comparison data available. Select a file and category above.</p>
        </div>
        <?php endif; ?>

        <?php endif; ?>
    </section>
</div>

<?php require __DIR__ . '/../includes/layout/footer.php'; ?>