@file:JvmName("Main")

package link.infra.packwiz.installer

import link.infra.packwiz.installer.metadata.SpaceSafeURI
import link.infra.packwiz.installer.target.Side
import link.infra.packwiz.installer.ui.cli.CLIHandler
import link.infra.packwiz.installer.ui.gui.GUIHandler
import link.infra.packwiz.installer.util.Log
import org.apache.commons.cli.DefaultParser
import org.apache.commons.cli.Options
import org.apache.commons.cli.ParseException
import java.awt.EventQueue
import java.awt.GraphicsEnvironment
import java.net.URISyntaxException
import javax.swing.JOptionPane
import javax.swing.UIManager
import kotlin.system.exitProcess

@Suppress("unused")
class Main(args: Array<String>) {
	// Don't attempt to start a GUI if we are headless
	private var guiEnabled = !GraphicsEnvironment.isHeadless()

	private fun startup(args: Array<String>) {
		val options = Options()
		addNonBootstrapOptions(options)
		addBootstrapOptions(options)

		val parser = DefaultParser()
		val cmd = try {
			parser.parse(options, args)
		} catch (e: ParseException) {
			Log.fatal("Failed to parse command line arguments", e)
			if (guiEnabled) {
				EventQueue.invokeAndWait {
					try {
						UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
					} catch (ignored: Exception) {
						// Ignore the exceptions, just continue using the ugly L&F
					}
					JOptionPane.showMessageDialog(null, "Failed to parse command line arguments: $e",
						"packwiz-installer", JOptionPane.ERROR_MESSAGE)
				}
			}
			exitProcess(1)
		}

		if (guiEnabled && cmd.hasOption("no-gui")) {
			guiEnabled = false
		}

		val ui = if (guiEnabled) GUIHandler() else CLIHandler()

		val unparsedArgs = cmd.args
		if (unparsedArgs.size > 1) {
			ui.showErrorAndExit("Too many arguments specified!")
		} else if (unparsedArgs.isEmpty()) {
			ui.showErrorAndExit("pack.toml URI to install from must be specified!")
		}

		val title = cmd.getOptionValue("title")
		if (title != null) {
			ui.title = title
		}

		ui.show()

		val uOptions = try {
			UpdateManager.Options.construct(
				downloadURI = SpaceSafeURI(unparsedArgs[0]),
				side = cmd.getOptionValue("side")?.let((Side)::from),
				packFolder = cmd.getOptionValue("pack-folder"),
				manifestFile = cmd.getOptionValue("meta-file")
			)
		} catch (e: URISyntaxException) {
			ui.showErrorAndExit("Failed to read pack.toml URI", e)
		}

		// Start update process!
		try {
			UpdateManager(uOptions, ui)
		} catch (e: Exception) {
			ui.showErrorAndExit("Update process failed", e)
		}
		println("Finished successfully!")
		ui.dispose()
	}

	companion object {
		// Called by packwiz-installer-bootstrap to set up the help command
		@JvmStatic
		fun addNonBootstrapOptions(options: Options) {
			options.addOption("s", "side", true, "Side to install mods from (client/server, defaults to client)")
			options.addOption(null, "title", true, "Title of the installer window")
			options.addOption(null, "pack-folder", true, "Folder to install the pack to (defaults to the JAR directory)")
			options.addOption(null, "meta-file", true, "JSON file to store pack metadata, relative to the pack folder (defaults to packwiz.json)")
		}

		// TODO: link these somehow so they're only defined once?
		@JvmStatic
		private fun addBootstrapOptions(options: Options) {
			options.addOption(null, "bootstrap-update-url", true, "Github API URL for checking for updates")
			options.addOption(null, "bootstrap-update-token", true, "Github API Access Token, for private repositories")
			options.addOption(null, "bootstrap-no-update", false, "Don't update packwiz-installer")
			options.addOption(null, "bootstrap-main-jar", true, "Location of the packwiz-installer JAR file")
			options.addOption("g", "no-gui", false, "Don't display a GUI to show update progress")
			options.addOption("h", "help", false, "Display this message") // Implemented in packwiz-installer-bootstrap!
		}
	}

	// Actual main() is in RequiresBootstrap!
	init {
		// Big overarching try/catch just in case everything breaks
		try {
			startup(args)
		} catch (e: Exception) {
			Log.fatal("Error from main", e)
			if (guiEnabled) {
				EventQueue.invokeLater {
					JOptionPane.showMessageDialog(null,
						"A fatal error occurred: \n$e",
						"packwiz-installer", JOptionPane.ERROR_MESSAGE)
					exitProcess(1)
				}
				// In case the EventQueue is broken, exit after 1 minute
				Thread.sleep(60 * 1000.toLong())
			}
			exitProcess(1)
		}
	}
}