<?php
/**
 * api/prayers_api.php — CRUD for custom_prayers.
 * Requires superuser+.
 *
 * GET    ?q=&source=all|standard|mine   — list prayers
 * POST                                  — create prayer  (body JSON)
 * PUT    ?id=X                          — update prayer  (body JSON)
 * DELETE ?id=X                          — delete prayer
 */
require_once __DIR__ . '/../config/db.php';
require_once __DIR__ . '/../includes/auth.php';

header('Content-Type: application/json');

function json_err(string $msg, int $code = 400): never {
    http_response_code($code);
    echo json_encode(['error' => $msg]);
    exit;
}

require_auth();
if (!has_role('superuser')) json_err('Access denied', 403);

$pdo    = get_pdo();
$user   = current_user();
$uid    = (int)$user['id'];
$is_admin = has_role('admin');
$method = $_SERVER['REQUEST_METHOD'];

// ─────────────────────────────────────────────────
// GET — list prayers
// ─────────────────────────────────────────────────
if ($method === 'GET') {
    $source = $_GET['source'] ?? 'all';
    $q      = trim($_GET['q'] ?? '');

    $where  = [];
    $params = [];

    if ($source === 'standard' || $source === 'mine') {
        if ($source === 'standard') {
            $where[]  = 'cp.is_global = 1 AND u.role = \'superadmin\'';
        } else {
            $where[]  = 'cp.created_by = ?';
            $params[] = $uid;
        }
    } else {
        // all: global prayers + own private prayers
        $where[]  = '(cp.is_global = 1 OR cp.created_by = ?)';
        $params[] = $uid;
    }

    if ($q !== '') {
        $like     = '%' . $q . '%';
        $where[]  = '(cp.name LIKE ? OR cp.leader_text LIKE ? OR cp.all_text LIKE ?)';
        $params[] = $like;
        $params[] = $like;
        $params[] = $like;
    }

    $sql = "
        SELECT cp.id, cp.name, cp.leader_text, cp.all_text,
               cp.default_bead_type, cp.is_global, cp.created_by,
               u.role AS creator_role,
               IF(cp.is_global=1 AND u.role='superadmin', 'standard',
                  IF(cp.is_global=1, 'global', 'mine')) AS source_tag
        FROM   custom_prayers cp
        LEFT   JOIN users u ON u.id = cp.created_by
        WHERE  " . implode(' AND ', $where) . "
        ORDER  BY (cp.is_global=1 AND u.role='superadmin') DESC, cp.name ASC
    ";
    $st = $pdo->prepare($sql);
    $st->execute($params);
    echo json_encode($st->fetchAll());
    exit;
}

// ─────────────────────────────────────────────────
// POST — create prayer
// ─────────────────────────────────────────────────
if ($method === 'POST') {
    $body = json_decode(file_get_contents('php://input'), true);
    if (!$body) json_err('Invalid JSON');

    $name      = trim($body['name'] ?? '');
    $leader    = trim($body['leader_text'] ?? '');
    $all       = trim($body['all_text'] ?? '');
    $global    = $is_admin ? (int)!empty($body['is_global']) : 0;
    $bead_type = in_array($body['default_bead_type'] ?? '', ['small','large','crucifix'])
                 ? $body['default_bead_type'] : null;

    if ($name === '') json_err('Prayer name is required');

    $st = $pdo->prepare(
        "INSERT INTO custom_prayers (name, leader_text, all_text, default_bead_type, is_global, created_by)
         VALUES (?, ?, ?, ?, ?, ?)"
    );
    $st->execute([$name, $leader, $all, $bead_type, $global, $uid]);
    $new_id = (int)$pdo->lastInsertId();

    $row = $pdo->prepare("
        SELECT cp.id, cp.name, cp.leader_text, cp.all_text,
               cp.default_bead_type, cp.is_global, cp.created_by,
               u.role AS creator_role,
               IF(cp.is_global=1 AND u.role='superadmin', 'standard',
                  IF(cp.is_global=1, 'global', 'mine')) AS source_tag
        FROM   custom_prayers cp LEFT JOIN users u ON u.id = cp.created_by
        WHERE  cp.id = ?
    ");
    $row->execute([$new_id]);
    echo json_encode(['created' => true, 'prayer' => $row->fetch()]);
    exit;
}

// ─────────────────────────────────────────────────
// PUT — update prayer
// ─────────────────────────────────────────────────
if ($method === 'PUT') {
    $id   = (int)($_GET['id'] ?? 0);
    $body = json_decode(file_get_contents('php://input'), true);
    if (!$id || !$body) json_err('Invalid request');

    $st = $pdo->prepare("SELECT * FROM custom_prayers WHERE id = ?");
    $st->execute([$id]);
    $prayer = $st->fetch();
    if (!$prayer) json_err('Prayer not found', 404);

    $can_edit = $is_admin || (int)$prayer['created_by'] === $uid;
    if (!$can_edit) json_err('Access denied', 403);

    $name      = trim($body['name'] ?? $prayer['name']);
    $leader    = trim($body['leader_text'] ?? $prayer['leader_text']);
    $all       = trim($body['all_text'] ?? $prayer['all_text']);
    $global    = $is_admin ? (int)!empty($body['is_global']) : (int)$prayer['is_global'];
    $bead_type = array_key_exists('default_bead_type', $body)
                 ? (in_array($body['default_bead_type'], ['small','large','crucifix']) ? $body['default_bead_type'] : null)
                 : $prayer['default_bead_type'];

    if ($name === '') json_err('Prayer name is required');

    $pdo->prepare(
        "UPDATE custom_prayers SET name=?, leader_text=?, all_text=?, default_bead_type=?, is_global=?, updated_at=NOW()
         WHERE id=?"
    )->execute([$name, $leader, $all, $bead_type, $global, $id]);

    $row = $pdo->prepare("
        SELECT cp.id, cp.name, cp.leader_text, cp.all_text,
               cp.default_bead_type, cp.is_global, cp.created_by,
               u.role AS creator_role,
               IF(cp.is_global=1 AND u.role='superadmin', 'standard',
                  IF(cp.is_global=1, 'global', 'mine')) AS source_tag
        FROM   custom_prayers cp LEFT JOIN users u ON u.id = cp.created_by
        WHERE  cp.id = ?
    ");
    $row->execute([$id]);
    echo json_encode(['updated' => true, 'prayer' => $row->fetch()]);
    exit;
}

// ─────────────────────────────────────────────────
// DELETE — remove prayer
// ─────────────────────────────────────────────────
if ($method === 'DELETE') {
    $id = (int)($_GET['id'] ?? 0);
    if (!$id) json_err('Missing id');

    $st = $pdo->prepare("SELECT * FROM custom_prayers WHERE id = ?");
    $st->execute([$id]);
    $prayer = $st->fetch();
    if (!$prayer) json_err('Prayer not found', 404);

    $can_delete = $is_admin || (int)$prayer['created_by'] === $uid;
    if (!$can_delete) json_err('Access denied', 403);

    // Prevent deleting if used in builder_steps
    $st2 = $pdo->prepare("SELECT COUNT(*) FROM builder_steps WHERE prayer_id = ?");
    $st2->execute([$id]);
    if ((int)$st2->fetchColumn() > 0) {
        json_err('Cannot delete: this prayer is used in one or more sessions. Remove it from those sessions first.');
    }

    $pdo->prepare("DELETE FROM custom_prayers WHERE id = ?")->execute([$id]);
    echo json_encode(['deleted' => true]);
    exit;
}

json_err('Method not allowed', 405);