<?php
header('Content-Type: application/json; charset=UTF-8');
require_once '../auth_helper.php';
requireLogin();
include_once '../db_connect.php';

$user = getCurrentUser();
$isPengelola = $user['role'] === 'pengelola';
$ibadahId    = $isPengelola ? intval($user['ibadah_id']) : null;

// ── Helper: Haversine distance in meters ──────────────────────────────────
function haversine($lat1, $lng1, $lat2, $lng2) {
    $R = 6371000;
    $dLat = deg2rad($lat2 - $lat1);
    $dLng = deg2rad($lng2 - $lng1);
    $a = sin($dLat/2)*sin($dLat/2)
       + cos(deg2rad($lat1))*cos(deg2rad($lat2))*sin($dLng/2)*sin($dLng/2);
    return $R * 2 * atan2(sqrt($a), sqrt(1-$a));
}

// ── 1. Rumah Ibadah ───────────────────────────────────────────────────────
if ($isPengelola && $ibadahId) {
    $riRes = $conn->query("SELECT * FROM rumah_ibadah WHERE id=$ibadahId");
} else {
    $riRes = $conn->query("SELECT * FROM rumah_ibadah");
}
$ibadahList = [];
while ($row = $riRes->fetch_assoc()) $ibadahList[] = $row;
$totalIbadah = count($ibadahList);

// Distribusi per jenis
$jenisDist = [];
foreach ($ibadahList as $ib) {
    $j = $ib['jenis'] ?? 'Lainnya';
    $jenisDist[$j] = ($jenisDist[$j] ?? 0) + 1;
}

// ── 2. Penduduk Miskin ────────────────────────────────────────────────────
$pmRes = $conn->query("SELECT * FROM penduduk_miskin");
$allMiskin = [];
while ($row = $pmRes->fetch_assoc()) $allMiskin[] = $row;

// Filter: pengelola hanya lihat yang dalam radius ibadahnya
if ($isPengelola && $ibadahId && !empty($ibadahList)) {
    $ib = $ibadahList[0];
    $filteredMiskin = array_filter($allMiskin, function($m) use ($ib) {
        return haversine((float)$ib['lat'], (float)$ib['lng'], (float)$m['lat'], (float)$m['lng']) <= (float)$ib['radius'];
    });
    $filteredMiskin = array_values($filteredMiskin);
} else {
    $filteredMiskin = $allMiskin;
}

$totalMiskin = count($filteredMiskin);
$totalJiwa   = array_sum(array_column($filteredMiskin, 'jumlah_jiwa'));

// Kategori bantuan
$kategoriDist = [];
foreach ($filteredMiskin as $m) {
    $k = $m['kategori_bantuan'] ?? 'Lainnya';
    $kategoriDist[$k] = ($kategoriDist[$k] ?? 0) + 1;
}

// Terurus vs Tidak (dalam radius salah satu ibadah)
$terurusCount = 0;
$tidakTerurusCount = 0;
foreach ($filteredMiskin as $m) {
    $inAnyRadius = false;
    foreach ($ibadahList as $ib) {
        if (haversine((float)$ib['lat'], (float)$ib['lng'], (float)$m['lat'], (float)$m['lng']) <= (float)$ib['radius']) {
            $inAnyRadius = true;
            break;
        }
    }
    if ($inAnyRadius) $terurusCount++;
    else $tidakTerurusCount++;
}

// Jika admin: hitung seluruh miskin dalam radius seluruh ibadah
if (!$isPengelola) {
    $allIbadahRes = $conn->query("SELECT * FROM rumah_ibadah");
    $allIbadahList = [];
    while ($row = $allIbadahRes->fetch_assoc()) $allIbadahList[] = $row;

    $terurusCount = 0;
    $tidakTerurusCount = 0;
    foreach ($allMiskin as $m) {
        $inAnyRadius = false;
        foreach ($allIbadahList as $ib) {
            if (haversine((float)$ib['lat'], (float)$ib['lng'], (float)$m['lat'], (float)$m['lng']) <= (float)$ib['radius']) {
                $inAnyRadius = true;
                break;
            }
        }
        if ($inAnyRadius) $terurusCount++;
        else $tidakTerurusCount++;
    }
}

// ── 3. Log Bantuan ────────────────────────────────────────────────────────
if ($isPengelola && $ibadahId) {
    $logRes = $conn->query("
        SELECT lb.*, ri.nama as nama_ibadah, ri.jenis as jenis_ibadah, pm.nama as nama_kk
        FROM log_bantuan lb
        JOIN rumah_ibadah ri ON ri.id = lb.ibadah_id
        JOIN penduduk_miskin pm ON pm.id = lb.miskin_id
        WHERE lb.ibadah_id = $ibadahId
        ORDER BY lb.tanggal DESC, lb.id DESC
        LIMIT 10
    ");
    $totalLogRes = $conn->query("SELECT COUNT(*) as cnt FROM log_bantuan WHERE ibadah_id=$ibadahId");
} else {
    $logRes = $conn->query("
        SELECT lb.*, ri.nama as nama_ibadah, ri.jenis as jenis_ibadah, pm.nama as nama_kk
        FROM log_bantuan lb
        JOIN rumah_ibadah ri ON ri.id = lb.ibadah_id
        JOIN penduduk_miskin pm ON pm.id = lb.miskin_id
        ORDER BY lb.tanggal DESC, lb.id DESC
        LIMIT 10
    ");
    $totalLogRes = $conn->query("SELECT COUNT(*) as cnt FROM log_bantuan");
}

$recentLogs = [];
while ($row = $logRes->fetch_assoc()) $recentLogs[] = $row;

$totalLog = 0;
if ($totalLogRes && $trow = $totalLogRes->fetch_assoc()) $totalLog = (int)$trow['cnt'];

// Distribusi tipe bantuan dari log
$tipeDist = [];
if ($isPengelola && $ibadahId) {
    $tipeRes = $conn->query("SELECT tipe_bantuan, COUNT(*) as cnt FROM log_bantuan WHERE ibadah_id=$ibadahId GROUP BY tipe_bantuan");
} else {
    $tipeRes = $conn->query("SELECT tipe_bantuan, COUNT(*) as cnt FROM log_bantuan GROUP BY tipe_bantuan");
}
while ($row = $tipeRes->fetch_assoc()) $tipeDist[$row['tipe_bantuan']] = (int)$row['cnt'];

// Bantuan per bulan (6 bulan terakhir)
if ($isPengelola && $ibadahId) {
    $bulanRes = $conn->query("
        SELECT DATE_FORMAT(tanggal, '%Y-%m') as bulan, COUNT(*) as cnt
        FROM log_bantuan
        WHERE ibadah_id=$ibadahId AND tanggal >= DATE_SUB(CURDATE(), INTERVAL 6 MONTH)
        GROUP BY bulan ORDER BY bulan ASC
    ");
} else {
    $bulanRes = $conn->query("
        SELECT DATE_FORMAT(tanggal, '%Y-%m') as bulan, COUNT(*) as cnt
        FROM log_bantuan
        WHERE tanggal >= DATE_SUB(CURDATE(), INTERVAL 6 MONTH)
        GROUP BY bulan ORDER BY bulan ASC
    ");
}
$bantuanPerBulan = [];
while ($row = $bulanRes->fetch_assoc()) $bantuanPerBulan[] = $row;

// ── 4. Ibadah Tipe (admin only: performa per ibadah) ─────────────────────
$ibadahPerforma = [];
if (!$isPengelola) {
    $perfRes = $conn->query("
        SELECT ri.id, ri.nama, ri.jenis, ri.radius,
               COUNT(DISTINCT lb.id) as total_log,
               COUNT(DISTINCT lb.miskin_id) as total_penerima
        FROM rumah_ibadah ri
        LEFT JOIN log_bantuan lb ON lb.ibadah_id = ri.id
        GROUP BY ri.id
        ORDER BY total_log DESC
    ");
    while ($row = $perfRes->fetch_assoc()) $ibadahPerforma[] = $row;
}

// ── Output ────────────────────────────────────────────────────────────────
echo json_encode([
    'status' => 'success',
    'role'   => $user['role'],
    'ibadah_id' => $ibadahId,
    'stats' => [
        'total_ibadah'      => $totalIbadah,
        'total_miskin'      => $totalMiskin,
        'total_jiwa'        => $totalJiwa,
        'total_log'         => $totalLog,
        'terurus'           => $terurusCount,
        'tidak_terurus'     => $tidakTerurusCount,
        'pct_terurus'       => $totalMiskin > 0 ? round($terurusCount / $totalMiskin * 100, 1) : 0,
    ],
    'distribusi' => [
        'jenis_ibadah'  => $jenisDist,
        'kategori'      => $kategoriDist,
        'tipe_bantuan'  => $tipeDist,
        'per_bulan'     => $bantuanPerBulan,
    ],
    'ibadah_list'     => $ibadahList,
    'ibadah_performa' => $ibadahPerforma,
    'recent_logs'     => $recentLogs,
]);