/**
 * @claude-flow/mcp - JSON Schema Validator
 *
 * Lightweight JSON Schema validation for tool inputs
 * Implements JSON Schema Draft 2020-12 subset
 */
/**
 * Validate data against JSON Schema
 */
export function validateSchema(data, schema, path = '') {
    const errors = [];
    // Type validation
    if (schema.type) {
        const typeValid = validateType(data, schema.type);
        if (!typeValid) {
            errors.push({
                path: path || 'root',
                message: `Expected type "${schema.type}", got "${typeof data}"`,
                keyword: 'type',
                params: { expected: schema.type, actual: typeof data },
            });
            return { valid: false, errors };
        }
    }
    // Null check
    if (data === null || data === undefined) {
        if (schema.type && schema.type !== 'null') {
            errors.push({
                path: path || 'root',
                message: 'Value cannot be null or undefined',
                keyword: 'type',
            });
        }
        return { valid: errors.length === 0, errors };
    }
    // String validations
    if (schema.type === 'string' && typeof data === 'string') {
        if (schema.minLength !== undefined && data.length < schema.minLength) {
            errors.push({
                path,
                message: `String length must be >= ${schema.minLength}`,
                keyword: 'minLength',
                params: { limit: schema.minLength, actual: data.length },
            });
        }
        if (schema.maxLength !== undefined && data.length > schema.maxLength) {
            errors.push({
                path,
                message: `String length must be <= ${schema.maxLength}`,
                keyword: 'maxLength',
                params: { limit: schema.maxLength, actual: data.length },
            });
        }
        if (schema.pattern) {
            const regex = new RegExp(schema.pattern);
            if (!regex.test(data)) {
                errors.push({
                    path,
                    message: `String must match pattern "${schema.pattern}"`,
                    keyword: 'pattern',
                    params: { pattern: schema.pattern },
                });
            }
        }
        if (schema.enum && !schema.enum.includes(data)) {
            errors.push({
                path,
                message: `Value must be one of: ${schema.enum.join(', ')}`,
                keyword: 'enum',
                params: { allowedValues: schema.enum },
            });
        }
    }
    // Number validations
    if ((schema.type === 'number' || schema.type === 'integer') && typeof data === 'number') {
        if (schema.type === 'integer' && !Number.isInteger(data)) {
            errors.push({
                path,
                message: 'Value must be an integer',
                keyword: 'type',
            });
        }
        if (schema.minimum !== undefined && data < schema.minimum) {
            errors.push({
                path,
                message: `Value must be >= ${schema.minimum}`,
                keyword: 'minimum',
                params: { limit: schema.minimum, actual: data },
            });
        }
        if (schema.maximum !== undefined && data > schema.maximum) {
            errors.push({
                path,
                message: `Value must be <= ${schema.maximum}`,
                keyword: 'maximum',
                params: { limit: schema.maximum, actual: data },
            });
        }
    }
    // Array validations
    if (schema.type === 'array' && Array.isArray(data)) {
        if (schema.items) {
            for (let i = 0; i < data.length; i++) {
                const itemResult = validateSchema(data[i], schema.items, `${path}[${i}]`);
                errors.push(...itemResult.errors);
            }
        }
    }
    // Object validations
    if (schema.type === 'object' && typeof data === 'object' && !Array.isArray(data)) {
        const obj = data;
        // Required properties
        if (schema.required) {
            for (const requiredProp of schema.required) {
                if (!(requiredProp in obj)) {
                    errors.push({
                        path: path ? `${path}.${requiredProp}` : requiredProp,
                        message: `Required property "${requiredProp}" is missing`,
                        keyword: 'required',
                        params: { missingProperty: requiredProp },
                    });
                }
            }
        }
        // Property validations
        if (schema.properties) {
            for (const [propName, propSchema] of Object.entries(schema.properties)) {
                if (propName in obj) {
                    const propPath = path ? `${path}.${propName}` : propName;
                    const propResult = validateSchema(obj[propName], propSchema, propPath);
                    errors.push(...propResult.errors);
                }
            }
        }
        // Additional properties check
        if (schema.additionalProperties === false && schema.properties) {
            const allowedProps = new Set(Object.keys(schema.properties));
            for (const propName of Object.keys(obj)) {
                if (!allowedProps.has(propName)) {
                    errors.push({
                        path: path ? `${path}.${propName}` : propName,
                        message: `Additional property "${propName}" is not allowed`,
                        keyword: 'additionalProperties',
                        params: { additionalProperty: propName },
                    });
                }
            }
        }
    }
    return { valid: errors.length === 0, errors };
}
/**
 * Validate type
 */
function validateType(data, expectedType) {
    if (expectedType === 'null') {
        return data === null;
    }
    if (expectedType === 'array') {
        return Array.isArray(data);
    }
    if (expectedType === 'integer') {
        return typeof data === 'number' && Number.isInteger(data);
    }
    if (expectedType === 'object') {
        return typeof data === 'object' && data !== null && !Array.isArray(data);
    }
    return typeof data === expectedType;
}
/**
 * Format validation errors for display
 */
export function formatValidationErrors(errors) {
    return errors.map((e) => `${e.path}: ${e.message}`).join('; ');
}
/**
 * Create a validator function for a specific schema
 */
export function createValidator(schema) {
    return (data) => validateSchema(data, schema);
}
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