#!/usr/bin/env php
<?php
/**
 * Migration script: move files from theses/ and documents/ to {objet}/YYYY/...
 * and update file_path in the thesis_files table.
 *
 * Self-contained — no framework bootstrap needed.
 *
 * Usage:
 *   php scripts/migrate-storage-paths.php [--dry-run]
 *
 * What it does:
 *   1. Reads all thesis_files rows where file_path starts with theses/ or documents/
 *   2. For each row, looks up the parent thesis's objet field
 *   3. Constructs the new path: {objet}/YYYY/FOLDERNAME/filename
 *   4. Creates the target directory if needed
 *   5. Renames the file on disk
 *   6. Updates file_path in the DB
 *   7. Cleans up empty directories under theses/ and documents/
 *
 * Dry-run mode prints what would be done without making changes.
 *
 * Note: Orphaned files on disk (no DB row) are NOT moved — use:
 *   find storage/theses storage/documents -type f 2>/dev/null
 */

$dryRun = in_array('--dry-run', $argv, true);

echo ($dryRun ? "[DRY RUN] " : "") . "Storage path migration: theses/ | documents/ → {objet}/YYYY/...\n";
echo "─────────────────────────────────────────────────────────────\n\n";

// ── Auto-detect paths ──────────────────────────────────────────────────────
// Remote deploy: repo root = /var/www/xamxam, storage in storage/
// Local dev:     script in scripts/, storage in ../app/storage/
$repoRoot = file_exists(__DIR__ . '/bootstrap.php') ? __DIR__ : dirname(__DIR__);

// DB path: try xamxam.db first, fall back to database.sqlite
$dbPath = $repoRoot . '/storage/xamxam.db';
if (!file_exists($dbPath)) {
    $dbPath = $repoRoot . '/storage/database.sqlite';
}
$storageRoot = $repoRoot . '/storage';

echo "Repo root:    {$repoRoot}\n";
echo "DB path:      {$dbPath}\n";
echo "Storage root: {$storageRoot}\n\n";

if (!file_exists($dbPath)) {
    die("ERROR: Database not found at {$dbPath}\n");
}

// ── Connect to DB ───────────────────────────────────────────────────────────
$pdo = new PDO('sqlite:' . $dbPath);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// Fetch all files that need migration
$sql = "SELECT tf.id, tf.thesis_id, tf.file_path, tf.file_name, t.objet, t.year
        FROM thesis_files tf
        JOIN theses t ON t.id = tf.thesis_id
        WHERE (tf.file_path LIKE 'theses/%' OR tf.file_path LIKE 'documents/%')
        AND t.objet IS NOT NULL
        ORDER BY tf.id ASC";

$stmt = $pdo->query($sql);
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);

$total = count($rows);
echo "Found {$total} file(s) to migrate.\n\n";

if ($total === 0) {
    echo "Nothing to do.\n";
    exit(0);
}

$moved = 0;
$skipped = 0;
$errors = [];
$folderCache = [];

foreach ($rows as $row) {
    $fileId   = (int)$row['id'];
    $thesisId = (int)$row['thesis_id'];
    $oldPath  = $row['file_path'];
    $objet    = $row['objet'];
    $year     = $row['year'];

    // Parse old path: theses/2025/FOLDERNAME/file.pdf or documents/2025/FOLDERNAME/file.pdf
    $parts = explode('/', $oldPath);
    if (count($parts) < 4) {
        $skipped++;
        $errors[] = "SKIP file #{$fileId}: unexpected path format '{$oldPath}'";
        continue;
    }

    $yearDir      = $parts[1];   // '2025'
    $folderName   = $parts[2];   // '2025_SMITH_Titre'
    $fileNameOnly = implode('/', array_slice($parts, 3)); // rest of path

    // Construct new path
    $newPath = $objet . '/' . $yearDir . '/' . $folderName . '/' . $fileNameOnly;

    // Skip if paths are identical
    if ($newPath === $oldPath) {
        $skipped++;
        echo "  #{$fileId} SKIP: already correct '{$oldPath}'\n";
        continue;
    }

    $oldAbs = $storageRoot . '/' . $oldPath;
    $newAbs = $storageRoot . '/' . $newPath;

    // Ensure target directory exists
    $newDir = dirname($newAbs);
    if (!isset($folderCache[$newDir])) {
        if (!is_dir($newDir)) {
            if (!$dryRun) {
                mkdir($newDir, 0755, true);
            }
            echo "  MKDIR {$newDir}\n";
        }
        $folderCache[$newDir] = true;
    }

    // Check source exists
    if (!file_exists($oldAbs)) {
        // If the target already exists (moved by a previous duplicate row), just update DB
        if (file_exists($newAbs)) {
            echo "  #{$fileId} {$oldPath}\n           → {$newPath} (target exists, DB-only update)\n";
            if (!$dryRun) {
                $pdo->prepare('UPDATE thesis_files SET file_path = ? WHERE id = ?')
                    ->execute([$newPath, $fileId]);
            }
            $moved++;
            continue;
        }
        $skipped++;
        echo "  #{$fileId} SKIP: source not found '{$oldAbs}'\n";
        continue;
    }

    // Check target doesn't exist
    if (file_exists($newAbs)) {
        $skipped++;
        echo "  #{$fileId} SKIP: target already exists '{$newAbs}'\n";
        continue;
    }

    echo "  #{$fileId} {$oldPath}\n           → {$newPath}\n";

    if (!$dryRun) {
        if (!rename($oldAbs, $newAbs)) {
            $skipped++;
            $errors[] = "FAIL file #{$fileId}: rename failed '{$oldAbs}' → '{$newAbs}'";
            echo "           ✗ rename failed\n";
            continue;
        }

        $pdo->prepare('UPDATE thesis_files SET file_path = ? WHERE id = ?')
            ->execute([$newPath, $fileId]);
    }

    $moved++;
}

echo "\n─────────────────────────────────────────────────────────────\n";
echo "Summary: {$moved} moved, {$skipped} skipped, " . count($errors) . " errors\n";

if (!empty($errors)) {
    echo "\nErrors:\n";
    foreach ($errors as $err) {
        echo "  {$err}\n";
    }
}

// Clean up empty directories
if (!$dryRun) {
    $oldRoots = [$storageRoot . '/theses', $storageRoot . '/documents'];
    foreach ($oldRoots as $oldRoot) {
        removeEmptyDirs($oldRoot);
    }
    echo "\nCleaned up empty directories.\n";
}

if ($dryRun) {
    echo "\nRun without --dry-run to apply changes.\n";
}

exit(empty($errors) ? 0 : 1);

// ── Helpers ────────────────────────────────────────────────────────────────

function removeEmptyDirs(string $dir): void
{
    if (!is_dir($dir)) {
        return;
    }
    $items = @scandir($dir);
    if ($items === false) {
        return;
    }
    foreach ($items as $item) {
        if ($item === '.' || $item === '..') {
            continue;
        }
        $path = $dir . '/' . $item;
        if (is_dir($path)) {
            removeEmptyDirs($path);
        }
    }
    @rmdir($dir);
}