<?php
// ================================================================
// API: Import Data Massal dari CSV
// ================================================================
require_once __DIR__ . '/../config/database.php';
require_once __DIR__ . '/../config/config.php';
require_once __DIR__ . '/../includes/auth.php';
require_once __DIR__ . '/../includes/functions.php';

header('Content-Type: application/json; charset=utf-8');

// Hanya POST
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'message' => 'Method tidak didukung']);
    exit;
}

$db   = getDB();
$type = $_POST['type'] ?? ''; // 'penduduk' | 'ibadah'

if (!in_array($type, ['penduduk', 'ibadah'])) {
    echo json_encode(['success' => false, 'message' => 'Tipe import tidak valid']); exit;
}

if (empty($_FILES['file']) || $_FILES['file']['error'] !== UPLOAD_ERR_OK) {
    echo json_encode(['success' => false, 'message' => 'File tidak valid atau tidak ada']); exit;
}

// Baca isi file
$content = file_get_contents($_FILES['file']['tmp_name']);
if ($content === false) {
    echo json_encode(['success' => false, 'message' => 'Gagal membaca file']); exit;
}

// Normalize line endings & parse CSV
$content = str_replace("\r\n", "\n", $content);
$content = str_replace("\r", "\n", $content);
$lines   = array_filter(explode("\n", $content), 'strlen');
$lines   = array_values($lines);

if (empty($lines)) {
    echo json_encode(['success' => false, 'message' => 'File kosong']); exit;
}

// Parse CSV baris per baris
function parseCSVLine(string $line): array {
    $cols = [];
    $cur  = '';
    $inQ  = false;
    for ($i = 0; $i < strlen($line); $i++) {
        $ch = $line[$i];
        if ($ch === '"') { $inQ = !$inQ; }
        elseif ($ch === ',' && !$inQ) { $cols[] = trim($cur, " \t\""); $cur = ''; }
        else { $cur .= $ch; }
    }
    $cols[] = trim($cur, " \t\"");
    return $cols;
}

// Deteksi header row
$firstLine = strtolower($lines[0]);
$hasHeader = str_contains($firstLine, 'nama') || str_contains($firstLine, 'lat') || str_contains($firstLine, 'kk_nama');
$dataLines = $hasHeader ? array_slice($lines, 1) : $lines;

$imported = 0;
$failed   = 0;
$skipped  = 0;
$errors   = [];

// ── Import Penduduk Miskin ─────────────────────────────────────
if ($type === 'penduduk') {
    $stmt = $db->prepare("
        INSERT INTO penduduk_miskin
            (kk_nama, nik, jumlah_anggota, alamat, kelurahan, kecamatan, lat, lng,
             rumah_ibadah_id, jarak_ke_ibadah, status_bantuan, jenis_bantuan, tanggal_bantuan, nominal_bantuan)
        VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)
    ");

    foreach ($dataLines as $lineNum => $line) {
        if (!trim($line)) continue;
        $row = parseCSVLine($line);

        // kk_nama (0), nik (1), jumlah_anggota (2), alamat (3), kelurahan (4),
        // kecamatan (5), lat (6), lng (7), status_bantuan (8), jenis_bantuan (9),
        // tanggal_bantuan (10), nominal_bantuan (11)
        if (count($row) < 8 || empty($row[0]) || empty($row[6]) || empty($row[7])) {
            $failed++;
            $errors[] = "Baris " . ($lineNum + ($hasHeader ? 2 : 1)) . ": kolom tidak lengkap atau koordinat kosong";
            if (count($errors) > 10) { $errors[] = '... dan lebih banyak error'; break; }
            continue;
        }

        $lat = (float)$row[6];
        $lng = (float)$row[7];
        if ($lat === 0.0 && $lng === 0.0) { $skipped++; continue; }

        $status = in_array($row[8] ?? '', ['sudah','belum','menunggu']) ? $row[8] : 'belum';
        $tanggal_bantuan = !empty($row[10]) ? sanitize($row[10]) : null;
        $nominal_bantuan = isset($row[11]) && $row[11] !== '' ? (float)str_replace(['.', ','], ['', '.'], $row[11]) : null;

        $nearest    = findNearestIbadah($lat, $lng);
        $ibadahId   = $nearest ? (int)$nearest['id']    : null;
        $jarakIbadah = $nearest ? (float)$nearest['jarak'] : null;

        try {
            $stmt->execute([
                sanitize($row[0]),
                sanitize($row[1] ?? ''),
                max(1, (int)($row[2] ?? 1)),
                sanitize($row[3] ?? ''),
                sanitize($row[4] ?? ''),
                sanitize($row[5] ?? ''),
                $lat, $lng,
                $ibadahId,
                $jarakIbadah,
                $status,
                sanitize($row[9] ?? ''),
                $tanggal_bantuan,
                $nominal_bantuan,
            ]);
            $imported++;
        } catch (PDOException $e) {
            $failed++;
            $errors[] = "Baris " . ($lineNum + ($hasHeader ? 2 : 1)) . ": " . $e->getMessage();
        }
    }
}

// ── Import Rumah Ibadah ───────────────────────────────────────
if ($type === 'ibadah') {
    $validJenis = ['Masjid','Musholla','Gereja','Katolik','Pura','Vihara','Klenteng','Lainnya'];

    $stmt = $db->prepare("
        INSERT INTO rumah_ibadah (nama, jenis, kontak, alamat, kelurahan, kecamatan, lat, lng, radius)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
    ");

    foreach ($dataLines as $lineNum => $line) {
        if (!trim($line)) continue;
        $row = parseCSVLine($line);

        // nama (0), jenis (1), kontak (2), alamat (3), kelurahan (4),
        // kecamatan (5), lat (6), lng (7), radius (8)
        if (count($row) < 8 || empty($row[0]) || empty($row[6]) || empty($row[7])) {
            $failed++;
            $errors[] = "Baris " . ($lineNum + ($hasHeader ? 2 : 1)) . ": kolom tidak lengkap";
            if (count($errors) > 10) { $errors[] = '... dan lebih banyak error'; break; }
            continue;
        }

        $lat = (float)$row[6];
        $lng = (float)$row[7];
        if ($lat === 0.0 && $lng === 0.0) { $skipped++; continue; }

        $jenis  = in_array($row[1] ?? '', $validJenis) ? $row[1] : 'Lainnya';
        $radius = max(100, min(5000, (int)($row[8] ?? RADIUS_DEFAULT)));

        try {
            $stmt->execute([
                sanitize($row[0]),
                $jenis,
                sanitize($row[2] ?? ''),
                sanitize($row[3] ?? ''),
                sanitize($row[4] ?? ''),
                sanitize($row[5] ?? ''),
                $lat, $lng, $radius,
            ]);
            $imported++;
        } catch (PDOException $e) {
            $failed++;
            $errors[] = "Baris " . ($lineNum + ($hasHeader ? 2 : 1)) . ": " . $e->getMessage();
        }
    }
}

echo json_encode([
    'success'  => true,
    'imported' => $imported,
    'failed'   => $failed,
    'skipped'  => $skipped,
    'errors'   => array_slice($errors, 0, 15),
    'message'  => "Import selesai: $imported berhasil, $failed gagal, $skipped dilewati",
], JSON_UNESCAPED_UNICODE);