/**
 * Lightweight JSON Schema validator for tool input parameters.
 *
 * Handles only the subset of JSON Schema used by ToolParametersSchema:
 *   - `type: "object"` with `properties` and `required`
 *   - Property types: string, number, boolean, array, object
 *   - `enum` constraints
 *
 * This is intentionally minimal — ~60 lines vs Ajv's 124 KB.
 * For our use-case (validating LLM-generated tool arguments), it's
 * 5-10× faster than Ajv because there's no schema compilation step.
 */
const TYPE_CHECKS = {
    string: (v) => typeof v === "string",
    number: (v) => typeof v === "number",
    integer: (v) => typeof v === "number" && Number.isInteger(v),
    boolean: (v) => typeof v === "boolean",
    array: (v) => Array.isArray(v),
    object: (v) => typeof v === "object" && v !== null && !Array.isArray(v),
};
function formatPath(path) {
    return path === "$" ? "input" : path.replace(/^\$\./, "");
}
function coerceValue(expectedType, value) {
    if ((expectedType === "number" || expectedType === "integer") && typeof value === "string") {
        const num = Number(value);
        if (!Number.isNaN(num)) {
            return num;
        }
    }
    if (expectedType === "boolean" && typeof value === "string") {
        if (value === "true")
            return true;
        if (value === "false")
            return false;
    }
    if ((expectedType === "object" || expectedType === "array") && typeof value === "string") {
        try {
            const parsed = JSON.parse(value);
            const checker = TYPE_CHECKS[expectedType];
            if (checker?.(parsed)) {
                return parsed;
            }
        }
        catch {
            // Ignore JSON parse failures and report the type error below.
        }
    }
    return value;
}
function validateSchemaValue(schema, value, path, errors) {
    const expectedType = schema.type;
    const checker = TYPE_CHECKS[expectedType];
    let current = value;
    if (checker && !checker(current)) {
        current = coerceValue(expectedType, current);
        if (!checker(current)) {
            errors.push(`Property '${formatPath(path)}' expected type '${expectedType}', got '${typeof value}'`);
            return current;
        }
        if (expectedType === "integer" && !Number.isInteger(current)) {
            errors.push(`Property '${formatPath(path)}' must be an integer, got ${current}`);
            return current;
        }
    }
    if (schema.enum && schema.enum.length > 0 && !schema.enum.includes(String(current))) {
        errors.push(`Property '${formatPath(path)}' must be one of [${schema.enum.join(", ")}], got '${current}'`);
    }
    const isObject = TYPE_CHECKS.object;
    if (expectedType === "object" && schema.properties && isObject?.(current)) {
        const obj = current;
        if (schema.required) {
            for (const key of schema.required) {
                if (!(key in obj) || obj[key] === undefined) {
                    errors.push(`Missing required property: ${formatPath(`${path}.${key}`)}`);
                }
            }
        }
        for (const [key, childSchema] of Object.entries(schema.properties)) {
            const childValue = obj[key];
            if (childValue === undefined || childValue === null)
                continue;
            obj[key] = validateSchemaValue(childSchema, childValue, `${path}.${key}`, errors);
        }
    }
    if (expectedType === "array" && schema.items && Array.isArray(current)) {
        current = current.map((item, index) => validateSchemaValue(schema.items, item, `${path}[${index}]`, errors));
    }
    return current;
}
/**
 * Validate an input value against a ToolParametersSchema.
 *
 * If `input` is nullish, it's treated as `{}` (matching Ajv behaviour
 * for schemas that only have optional properties).
 *
 * Returns `{ valid: true, errors: [] }` on success.
 */
export function validateToolInput(schema, input) {
    const errors = [];
    const obj = (input ?? {});
    if (typeof obj !== "object" || obj === null || Array.isArray(obj)) {
        return { valid: false, errors: ["Input must be an object"] };
    }
    // Required fields
    if (schema.required) {
        for (const key of schema.required) {
            if (!(key in obj) || obj[key] === undefined) {
                errors.push(`Missing required property: ${key}`);
            }
        }
    }
    // Property type + enum checks
    for (const [key, propSchema] of Object.entries(schema.properties)) {
        const value = obj[key];
        if (value === undefined || value === null)
            continue; // skip optional absent
        obj[key] = validateSchemaValue(propSchema, value, `$.${key}`, errors);
    }
    return { valid: errors.length === 0, errors };
}
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