<?php
// api/kontribusi.php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, PUT, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type, Authorization');

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { 
    http_response_code(200); 
    exit; 
}

require_once '../config/db.php';
require_once 'middleware.php';

$method = $_SERVER['REQUEST_METHOD'];

try {
    switch ($method) {
        case 'GET':
            // Wajib login untuk melihat riwayat kontribusi
            $currentUser = requireAuth(['admin', 'koordinator', 'kontributor']);
            
            if ($currentUser['role'] === 'kontributor') {
                // Hanya riwayat kontribusi milik sendiri
                $stmt = $pdo->prepare("
                    SELECT ko.id, ko.user_id, ko.kebutuhan_id, ko.status, ko.created_at, ko.updated_at,
                           ko.jumlah,
                           ko.jenis_kontribusi AS tipe_kontribusi,
                           ko.detail_barang_jasa AS catatan,
                           k.jenis_bantuan,
                           ri.nama AS nama_rumah_ibadah,
                           ri.nama AS nama_ibadah
                    FROM kontribusi ko
                    JOIN kebutuhan k ON ko.kebutuhan_id = k.id
                    JOIN rumah_ibadah ri ON k.rumah_ibadah_id = ri.id
                    WHERE ko.user_id = ?
                    ORDER BY ko.created_at DESC
                ");
                $stmt->execute([$currentUser['id']]);
                $rows = $stmt->fetchAll();
            } else {
                // Admin atau Koordinator melihat kontribusi
                $where = "";
                $params = [];
                if ($currentUser['role'] === 'koordinator') {
                    $where = "WHERE k.rumah_ibadah_id = ?";
                    $params[] = $currentUser['rumah_ibadah_id'];
                }

                $stmt = $pdo->prepare("
                    SELECT ko.id, ko.user_id, ko.kebutuhan_id, ko.status, ko.created_at, ko.updated_at,
                           ko.jumlah,
                           ko.jenis_kontribusi AS tipe_kontribusi,
                           ko.detail_barang_jasa AS catatan,
                           k.jenis_bantuan,
                           ri.nama AS nama_rumah_ibadah,
                           ri.nama AS nama_ibadah,
                           u.username AS nama_kontributor,
                           u.email AS kontak_kontributor
                    FROM kontribusi ko
                    JOIN kebutuhan k ON ko.kebutuhan_id = k.id
                    JOIN rumah_ibadah ri ON k.rumah_ibadah_id = ri.id
                    JOIN users u ON ko.user_id = u.id
                    $where
                    ORDER BY ko.created_at DESC
                ");
                $stmt->execute($params);
                $rows = $stmt->fetchAll();
            }

            echo json_encode(['success' => true, 'data' => $rows]);
            break;

        case 'POST':
            // Wajib login sebagai Kontributor untuk berdonasi
            $currentUser = requireAuth(['kontributor']);
            $body = json_decode(file_get_contents('php://input'), true) ?: $_POST;

            $kebutuhanId      = (int)($body['kebutuhan_id'] ?? 0);
            $jenisKontribusi  = trim($body['jenis_kontribusi'] ?? $body['tipe_kontribusi'] ?? ''); // uang/barang/jasa
            $jumlahDonasi     = (float)($body['jumlah'] ?? 0);
            $detail           = trim($body['detail_barang_jasa'] ?? $body['catatan'] ?? '');

            if (!$kebutuhanId || !$jenisKontribusi || $jumlahDonasi <= 0) {
                http_response_code(400);
                echo json_encode(['success' => false, 'message' => 'Input data donasi tidak lengkap/valid.']);
                exit;
            }

            // ════════════════════════════════════════════════════════════════════════════
            // VALIDASI SISA KEBUTUHAN
            // ════════════════════════════════════════════════════════════════════════════
            $stmt = $pdo->prepare("
                SELECT k.jumlah_dibutuhkan, k.kategori,
                       COALESCE(SUM(CASE WHEN ko.status = 'confirmed' THEN ko.jumlah ELSE 0 END), 0) AS jumlah_terkumpul
                FROM kebutuhan k
                LEFT JOIN kontribusi ko ON k.id = ko.kebutuhan_id
                WHERE k.id = ?
                GROUP BY k.id
            ");
            $stmt->execute([$kebutuhanId]);
            $kebutuhan = $stmt->fetch();

            if (!$kebutuhan) {
                http_response_code(404);
                echo json_encode(['success' => false, 'message' => 'Data kebutuhan bantuan tidak ditemukan.']);
                exit;
            }

            // Hitung sisa kebutuhan secara dinamis
            $sisaKebutuhan = (float)$kebutuhan['jumlah_dibutuhkan'] - (float)$kebutuhan['jumlah_terkumpul'];

            if ($jumlahDonasi > $sisaKebutuhan) {
                http_response_code(400);
                echo json_encode([
                    'success' => false,
                    'message' => sprintf(
                        'Donasi ditolak! Jumlah kontribusi (%.2f) melebihi sisa kebutuhan bantuan saat ini (%.2f).',
                        $jumlahDonasi,
                        $sisaKebutuhan
                    )
                ]);
                exit;
            }

            // Simpan kontribusi (default status = pending)
            $stmt = $pdo->prepare("
                INSERT INTO kontribusi (user_id, kebutuhan_id, jenis_kontribusi, jumlah, detail_barang_jasa, status)
                VALUES (?, ?, ?, ?, ?, 'pending')
            ");
            $stmt->execute([$currentUser['id'], $kebutuhanId, $jenisKontribusi, $jumlahDonasi, $detail]);

            echo json_encode([
                'success' => true,
                'message' => 'Terima kasih atas kontribusi Anda! Status kontribusi saat ini menunggu verifikasi (pending).',
                'id'      => $pdo->lastInsertId()
            ]);
            break;

        case 'PUT':
            // Konfirmasi kontribusi (pending -> confirmed)
            // Hanya Admin atau Koordinator terkait
            $currentUser = requireAuth(['admin', 'koordinator']);
            $body = json_decode(file_get_contents('php://input'), true) ?: $_POST;
            $kontribusiId = (int)($body['id'] ?? 0);
            $newStatus    = trim($body['status'] ?? 'pending'); // pending/confirmed

            if (!$kontribusiId || !in_array($newStatus, ['pending', 'confirmed'])) {
                http_response_code(400);
                echo json_encode(['success' => false, 'message' => 'Parameter input status tidak valid.']);
                exit;
            }

            // Ambil detail kontribusi
            $stmt = $pdo->prepare("
                SELECT ko.jumlah, ko.status AS status_sebelumnya, ko.kebutuhan_id, k.rumah_ibadah_id 
                FROM kontribusi ko
                JOIN kebutuhan k ON ko.kebutuhan_id = k.id
                WHERE ko.id = ?
            ");
            $stmt->execute([$kontribusiId]);
            $kontribusi = $stmt->fetch();

            if (!$kontribusi) {
                http_response_code(404);
                echo json_encode(['success' => false, 'message' => 'Data kontribusi tidak ditemukan.']);
                exit;
            }

            // Batasan wilayah untuk Koordinator
            if ($currentUser['role'] === 'koordinator' && $currentUser['rumah_ibadah_id'] != $kontribusi['rumah_ibadah_id']) {
                http_response_code(403);
                echo json_encode(['success' => false, 'message' => 'Koordinator hanya berhak mengonfirmasi donasi untuk rumah ibadahnya sendiri.']);
                exit;
            }

            // Jika status dirubah ke 'confirmed' dari 'pending'
            if ($newStatus === 'confirmed' && $kontribusi['status_sebelumnya'] !== 'confirmed') {
                $stmt = $pdo->prepare("
                    SELECT k.jumlah_dibutuhkan,
                           COALESCE(SUM(CASE WHEN ko.status = 'confirmed' THEN ko.jumlah ELSE 0 END), 0) AS jumlah_terkumpul
                    FROM kebutuhan k
                    LEFT JOIN kontribusi ko ON k.id = ko.kebutuhan_id
                    WHERE k.id = ?
                    GROUP BY k.id
                ");
                $stmt->execute([$kontribusi['kebutuhan_id']]);
                $kebutuhan = $stmt->fetch();

                $sisaKebutuhan = (float)$kebutuhan['jumlah_dibutuhkan'] - (float)$kebutuhan['jumlah_terkumpul'];

                if ($kontribusi['jumlah'] > $sisaKebutuhan) {
                    http_response_code(400);
                    echo json_encode([
                        'success' => false,
                        'message' => 'Gagal konfirmasi! Total confirmed donasi melebihi kapasitas kebutuhan.'
                    ]);
                    exit;
                }
            }

            $stmt = $pdo->prepare("UPDATE kontribusi SET status = ? WHERE id = ?");
            $stmt->execute([$newStatus, $kontribusiId]);

            echo json_encode(['success' => true, 'message' => 'Status kontribusi berhasil diperbarui ke ' . $newStatus]);
            break;

        default:
            http_response_code(405);
            echo json_encode(['error' => 'Method not allowed']);
    }
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
}