"use strict";

// Compatibility shim for legacy Atom packages that do `require('remote')`.
//
// Old Electron exposed the `remote` module and Atom packages frequently used:
//   const remote = require('remote')
//   const dialog = remote.dialog || remote.require('dialog')
//
// Newer Electron removed `remote` by default. Pulsar may provide @electron/remote
// or alternative dialog helpers via Atom's application delegate.

function getElectron() {
	try {
		// Available in renderer.
		return require("electron");
	} catch (_) {
		return null;
	}
}

function getRemote() {
	const electron = getElectron();
	if (electron && electron.remote) return electron.remote;
	try {
		// Some apps (incl. Pulsar/Atom forks) ship this.
		return require("@electron/remote");
	} catch (_) {
		return null;
	}
}

function getAtomDialogDelegate() {
	try {
		if (typeof atom !== "undefined" && atom && atom.applicationDelegate) {
			return atom.applicationDelegate;
		}
	} catch (_) {
		// ignore
	}
	return null;
}

function toOldCallback(result, callback) {
	// Electron >= 7 showSaveDialog returns { canceled, filePath }
	if (!callback) return;
	if (!result || result.canceled) return callback(undefined);
	return callback(result.filePath);
}

function wrapDialog(dialog) {
	if (!dialog) return null;

	// Ensure callback-style APIs exist.
	if (typeof dialog.showSaveDialog === "function") {
		const original = dialog.showSaveDialog.bind(dialog);
		dialog.showSaveDialog = function showSaveDialogCompat(browserWindow, options, callback) {
			// Legacy call pattern: (win, options, cb)
			if (typeof options === "function") {
				callback = options;
				options = browserWindow;
				browserWindow = undefined;
			}

			try {
				const maybePromise = original(browserWindow, options);
				if (maybePromise && typeof maybePromise.then === "function") {
					return maybePromise.then((res) => {
						toOldCallback(res, callback);
						return res;
					});
				}
				// Some older implementations support the callback directly.
				if (typeof callback === "function") return original(browserWindow, options, callback);
				return maybePromise;
			} catch (err) {
				if (typeof callback === "function") return callback(undefined);
				throw err;
			}
		};
	}

	if (typeof dialog.showMessageBox === "function") {
		const original = dialog.showMessageBox.bind(dialog);
		dialog.showMessageBox = function showMessageBoxCompat(browserWindow, options, callback) {
			if (typeof options === "function") {
				callback = options;
				options = browserWindow;
				browserWindow = undefined;
			}

			// Legacy Atom/Electron usage sometimes expects a *synchronous* numeric response.
			// Prefer sync primitives when no callback is provided.
			if (typeof callback !== "function") {
				try {
					if (typeof dialog.showMessageBoxSync === "function") {
						return dialog.showMessageBoxSync(browserWindow, options);
					}
					if (typeof atom !== "undefined" && atom && typeof atom.confirm === "function") {
						return atom.confirm({
							message: (options && (options.title || options.message)) || "",
							detailedMessage: options && options.title && options.message ? options.message : undefined,
							buttons: (options && options.buttons) || ["OK"],
						});
					}
				} catch (_) {
					// Fall through to async implementation.
				}
			}
			try {
				const maybePromise = original(browserWindow, options);
				if (maybePromise && typeof maybePromise.then === "function") {
					return maybePromise.then((res) => {
						if (typeof callback === "function") {
							// Electron returns { response, checkboxChecked }
							callback(res && typeof res.response === "number" ? res.response : res);
						}
						return res;
					});
				}
				if (typeof callback === "function") return original(browserWindow, options, callback);
				return maybePromise;
			} catch (err) {
				if (typeof callback === "function") return callback(0);
				throw err;
			}
		};
	}

	return dialog;
}

const remote = getRemote();
const electron = getElectron();

let dialog = null;
if (remote && remote.dialog) dialog = remote.dialog;
else if (electron && electron.dialog) dialog = electron.dialog;

const atomDelegate = getAtomDialogDelegate();
if (!dialog && atomDelegate) {
	// Atom/Pulsar delegate methods are typically Promise-based.
	dialog = {
		showSaveDialog(browserWindow, options, callback) {
			try {
				const p = atomDelegate.showSaveDialog ? atomDelegate.showSaveDialog(options) : null;
				if (p && typeof p.then === "function") {
					return p.then((filePath) => {
						if (typeof callback === "function") callback(filePath);
						return { canceled: !filePath, filePath };
					});
				}
				if (typeof callback === "function") callback(undefined);
				return { canceled: true, filePath: undefined };
			} catch (err) {
				if (typeof callback === "function") callback(undefined);
				return { canceled: true, filePath: undefined };
			}
		},
		showMessageBox(browserWindow, options, callback) {
			try {
				const p = atomDelegate.showMessageBox ? atomDelegate.showMessageBox(options) : null;
				if (p && typeof p.then === "function") {
					return p.then((response) => {
						if (typeof callback === "function") callback(response);
						return { response };
					});
				}
				if (typeof callback === "function") callback(0);
				return { response: 0 };
			} catch (err) {
				if (typeof callback === "function") callback(0);
				return { response: 0 };
			}
		},
	};
}

// Absolute last-resort fallback: avoid hard crashes if no dialog backend exists.
if (!dialog) {
	dialog = {
		showSaveDialog(browserWindow, options, callback) {
			try {
				if (atomDelegate && typeof atomDelegate.showSaveDialog === "function") {
					const p = atomDelegate.showSaveDialog(options);
					if (p && typeof p.then === "function") {
						return p.then((filePath) => {
							if (typeof callback === "function") callback(filePath);
							return { canceled: !filePath, filePath };
						});
					}
				}
			} catch (_) {
				// ignore
			}
			if (typeof callback === "function") callback(undefined);
			return { canceled: true, filePath: undefined };
		},
		showMessageBox(browserWindow, options, callback) {
			try {
				if (typeof atom !== "undefined" && atom && typeof atom.confirm === "function") {
					const response = atom.confirm({
						message: (options && (options.title || options.message)) || "",
						detailedMessage: options && options.title && options.message ? options.message : undefined,
						buttons: (options && options.buttons) || ["OK"],
					});
					if (typeof callback === "function") callback(response);
					return response;
				}
			} catch (_) {
				// ignore
			}
			if (typeof callback === "function") callback(0);
			return 0;
		},
	};
}

dialog = wrapDialog(dialog);

function remoteRequire(moduleName) {
	if (remote && typeof remote.require === "function") return remote.require(moduleName);
	if (moduleName === "dialog") return dialog;
	// Best-effort: some old code asks for 'browser-window', etc.
	if (electron) {
		if (moduleName === "browser-window" || moduleName === "BrowserWindow") return electron.BrowserWindow;
		if (moduleName === "app") return electron.app;
	}
	throw new Error("remote.require not available for: " + moduleName);
}

module.exports = {
	dialog,
	require: remoteRequire,
	getCurrentWindow: (remote && typeof remote.getCurrentWindow === "function")
		? remote.getCurrentWindow.bind(remote)
		: function () {
			try {
				return typeof atom !== "undefined" && atom.getCurrentWindow ? atom.getCurrentWindow() : undefined;
			} catch (_) {
				return undefined;
			}
		},
};