'use strict';

/**
 * 依据 msg.crudFlow.delete 生成删除请求体，支持占位符 {{primaryKey}}。
 */

return configureDeleteRequest(msg, node);

function configureDeleteRequest(message, node) {
    if (!message.crudFlow || !message.crudFlow.delete) {
        return message;
    }

    const del = message.crudFlow.delete;
    const baseUrl = message.crudFlow.baseUrl || '';
    const primaryKeyValue = del.actualKey || message.primaryKeyValue || del.primaryKey || 'testid2';
    const method = (del.method || 'POST').toUpperCase();

    let path = del.path || '';
    let payload = null;

    if (method === 'DELETE' && path.includes('{')) {
        path = path.replace(/\{[^}]+\}/g, encodeURIComponent(primaryKeyValue));
    } else {
        const template = del.payloadTemplate || { version: '1.0.0', data: ['{{primaryKey}}'] };
        payload = materialiseTemplate(template, primaryKeyValue);
    }

    message.method = method;
    message.url = mergeUrl(baseUrl, path);
    message.headers = Object.assign({}, message.crudFlow.headers || {}, del.headers || {});

    if (payload !== null) {
        message.payload = payload;
    } else if (message.payload !== undefined) {
        delete message.payload;
    }

    return message;
}

function materialiseTemplate(template, primaryKeyValue) {
    const cloned = clone(template);
    return replacePlaceholder(cloned, primaryKeyValue);
}

function replacePlaceholder(value, primaryKeyValue) {
    if (typeof value === 'string') {
        return value.replace(/\{\{\s*primaryKey\s*\}\}/g, primaryKeyValue);
    }
    if (Array.isArray(value)) {
        return value.map(item => replacePlaceholder(item, primaryKeyValue));
    }
    if (value && typeof value === 'object') {
        const result = {};
        for (const key of Object.keys(value)) {
            result[key] = replacePlaceholder(value[key], primaryKeyValue);
        }
        return result;
    }
    return value;
}

function mergeUrl(base, path) {
    const prefix = (base || '').replace(/\/+$/, '');
    const suffix = (path || '').replace(/^\/+/, '');
    if (!prefix) {
        return `/${suffix}`;
    }
    if (!suffix) {
        return prefix;
    }
    return `${prefix}/${suffix}`;
}

function clone(value) {
    return value == null ? value : JSON.parse(JSON.stringify(value));
}