"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
let deprecationHandler = null;
function warnOnce(oldName, newName) {
    let warned = false;
    const msg = newName
        ? `'${oldName}' is deprecated and will be removed. Please use '${newName}' instead.`
        : `'${oldName}' is deprecated and will be removed.`;
    return () => {
        if (!warned && !process.noDeprecation) {
            warned = true;
            deprecate.log(msg);
        }
    };
}
const deprecate = {
    setHandler: (handler) => { deprecationHandler = handler; },
    getHandler: () => deprecationHandler,
    warn: (oldName, newName) => {
        if (!process.noDeprecation) {
            deprecate.log(`'${oldName}' is deprecated. Use '${newName}' instead.`);
        }
    },
    log: (message) => {
        if (typeof deprecationHandler === 'function') {
            deprecationHandler(message);
        }
        else if (process.throwDeprecation) {
            throw new Error(message);
        }
        else if (process.traceDeprecation) {
            return console.trace(message);
        }
        else {
            return console.warn(`(electron) ${message}`);
        }
    },
    // remove a function with no replacement
    removeFunction: (fn, removedName) => {
        if (!fn) {
            throw Error(`'${removedName} function' is invalid or does not exist.`);
        }
        // wrap the deprecated function to warn user
        const warn = warnOnce(`${fn.name} function`);
        return function () {
            warn();
            fn.apply(this, arguments);
        };
    },
    // change the name of a function
    renameFunction: (fn, newName) => {
        const warn = warnOnce(`${fn.name} function`, `${newName} function`);
        return function () {
            warn();
            fn.apply(this, arguments);
        };
    },
    // change the name of an event
    event: (emitter, oldName, newName) => {
        const warn = newName.startsWith('-') /* internal event */
            ? warnOnce(`${oldName} event`)
            : warnOnce(`${oldName} event`, `${newName} event`);
        return emitter.on(newName, function (...args) {
            if (this.listenerCount(oldName) !== 0) {
                warn();
                this.emit(oldName, ...args);
            }
        });
    },
    // deprecate a getter/setter function pair in favor of a property
    fnToProperty: (module, prop, getter, setter) => {
        const withWarnOnce = (obj, key, oldName, newName) => {
            const warn = warnOnce(oldName, newName);
            return (...args) => {
                warn();
                return obj[key](...args);
            };
        };
        module[getter.substr(1)] = withWarnOnce(module, getter, `${getter.substr(1)} function`, `${prop} property`);
        module[setter.substr(1)] = withWarnOnce(module, setter, `${setter.substr(1)} function`, `${prop} property`);
    },
    // remove a property with no replacement
    removeProperty: (o, removedName) => {
        // if the property's already been removed, warn about it
        if (!(removedName in o)) {
            deprecate.log(`Unable to remove property '${removedName}' from an object that lacks it.`);
        }
        // wrap the deprecated property in an accessor to warn
        const warn = warnOnce(removedName);
        let val = o[removedName];
        return Object.defineProperty(o, removedName, {
            configurable: true,
            get: () => {
                warn();
                return val;
            },
            set: newVal => {
                warn();
                val = newVal;
            }
        });
    },
    // deprecate a callback-based function in favor of one returning a Promise
    promisify: (fn) => {
        const fnName = fn.name || 'function';
        const oldName = `${fnName} with callbacks`;
        const newName = `${fnName} with Promises`;
        const warn = warnOnce(oldName, newName);
        return function (...params) {
            let cb;
            if (params.length > 0 && typeof params[params.length - 1] === 'function') {
                cb = params.pop();
            }
            const promise = fn.apply(this, params);
            if (!cb)
                return promise;
            if (process.enablePromiseAPIs)
                warn();
            return promise
                .then((res) => {
                process.nextTick(() => {
                    cb.length === 2 ? cb(null, res) : cb(res);
                });
                return res;
            }, (err) => {
                process.nextTick(() => {
                    cb.length === 2 ? cb(err) : cb();
                });
                throw err;
            });
        };
    },
    // deprecate a callback-based function in favor of one returning a Promise
    promisifyMultiArg: (fn, convertPromiseValue) => {
        const fnName = fn.name || 'function';
        const oldName = `${fnName} with callbacks`;
        const newName = `${fnName} with Promises`;
        const warn = warnOnce(oldName, newName);
        return function (...params) {
            let cb;
            if (params.length > 0 && typeof params[params.length - 1] === 'function') {
                cb = params.pop();
            }
            const promise = fn.apply(this, params);
            if (!cb)
                return promise;
            if (process.enablePromiseAPIs)
                warn();
            return promise
                .then((res) => {
                if (convertPromiseValue) {
                    res = convertPromiseValue(res);
                }
                process.nextTick(() => {
                    // eslint-disable-next-line standard/no-callback-literal
                    cb.length > 2 ? cb(null, ...res) : cb(...res);
                });
            }, (err) => {
                process.nextTick(() => cb(err));
            });
        };
    },
    // change the name of a property
    renameProperty: (o, oldName, newName) => {
        const warn = warnOnce(oldName, newName);
        // if the new property isn't there yet,
        // inject it and warn about it
        if ((oldName in o) && !(newName in o)) {
            warn();
            o[newName] = o[oldName];
        }
        // wrap the deprecated property in an accessor to warn
        // and redirect to the new property
        return Object.defineProperty(o, oldName, {
            get: () => {
                warn();
                return o[newName];
            },
            set: value => {
                warn();
                o[newName] = value;
            }
        });
    }
};
exports.default = deprecate;