'use strict';

// Unknown Error
export const UNKNOWN_ERROR = 'UNKNOWN_ERROR';

// Not implemented
export const NOT_IMPLEMENTED = 'NOT_IMPLEMENTED';

// Missing new operator to an object
//  - name: The name of the class
export const MISSING_NEW = 'MISSING_NEW';

// Call exception
//  - transaction: the transaction
//  - address?: the contract address
//  - args?: The arguments passed into the function
//  - method?: The Solidity method signature
//  - errorSignature?: The EIP848 error signature
//  - errorArgs?: The EIP848 error parameters
//  - reason: The reason (only for EIP848 "Error(string)")
export const CALL_EXCEPTION = 'CALL_EXCEPTION';

// Response from a server was invalid
//   - response: The body of the response
//'BAD_RESPONSE',

// Invalid argument (e.g. value is incompatible with type) to a function:
//   - arg: The argument name that was invalid
//   - value: The value of the argument
export const INVALID_ARGUMENT = 'INVALID_ARGUMENT';

// Missing argument to a function:
//   - count: The number of arguments received
//   - expectedCount: The number of arguments expected
export const MISSING_ARGUMENT = 'MISSING_ARGUMENT';

// Too many arguments
//   - count: The number of arguments received
//   - expectedCount: The number of arguments expected
export const UNEXPECTED_ARGUMENT = 'UNEXPECTED_ARGUMENT';

// Numeric Fault
//   - operation: the operation being executed
//   - fault: the reason this faulted
export const NUMERIC_FAULT = 'NUMERIC_FAULT';


// Unsupported operation
//   - operation
export const UNSUPPORTED_OPERATION = 'UNSUPPORTED_OPERATION';

let _permanentCensorErrors = false;
let _censorErrors = false;


// @TODO: Enum
export function throwError(message: string, code: string, params: any): never {
    if (_censorErrors) {
        throw new Error('unknown error');
    }

    if (!code) { code = UNKNOWN_ERROR; }
    if (!params) { params = {}; }

    var messageDetails: Array<string> = [];
    Object.keys(params).forEach(function(key) {
        try {
            messageDetails.push(key + '=' + JSON.stringify(params[key]));
        } catch (error) {
            messageDetails.push(key + '=' + JSON.stringify(params[key].toString()));
        }
    });
    var reason = message;
    if (messageDetails.length) {
        message += ' (' + messageDetails.join(', ') + ')';
    }

    // @TODO: Any??
    var error: any = new Error(message);
    error.reason = reason;
    error.code = code

    Object.keys(params).forEach(function(key) {
        error[key] = params[key];
    });

    throw error;
}

export function checkNew(self: any, kind: any): void {
    if (!(self instanceof kind)) {
        throwError('missing new', MISSING_NEW, { name: kind.name });
    }
}

export function checkArgumentCount(count: number, expectedCount: number, suffix?: string): void {
    if (!suffix) { suffix = ''; }
    if (count < expectedCount) {
        throwError('missing argument' + suffix, MISSING_ARGUMENT, { count: count, expectedCount: expectedCount });
    }
    if (count > expectedCount) {
        throwError('too many arguments' + suffix, UNEXPECTED_ARGUMENT, { count: count, expectedCount: expectedCount });
    }
}

export function setCensorship(censorship: boolean, permanent?: boolean): void {
    if (_permanentCensorErrors) {
        throwError('error censorship permanent', UNSUPPORTED_OPERATION, { operation: 'setCersorship' });
    }

    _censorErrors = !!censorship;
    _permanentCensorErrors = !!permanent;
}