import snag;
import commandr;
import std.file;
import std.stdio : writeln;

import core.stdc.stdlib : EXIT_SUCCESS, EXIT_FAILURE;

private string programName = "snag";

int main(string[] args)
{
	if (!checkGit()) {
		"Using snag requires Git to be installed".writeln;
		return EXIT_FAILURE;
	}

	auto argumets = new Program(programName, snagVersion)
		.add(new Command("init", "Initializing the repository for storing snapshots")
			.add(new Flag("f", "force", "Initializing a repository with overwriting the existing one")
				.name("force")
				.optional
			)
		)
		.add(new Command("rules", "Tracking rules")
			.add(new Command("update", "Update rules")
				.add(new Flag("r", "remove", "Removing from tracking the found ignored files")
					.name("remove")
					.optional
				)
			)
			.add(new Command("reset", "Reset rules (restores rules to pre-change state)"))
			.add(new Command("clear", "Clear rules"))
			.add(new Command("save", "Save rules"))
			.add(new Command("show", "Show rules")
				.add(new Flag("c", "config", "Show rules from the configuration file")
					.name("config")
					.optional
				)
			)
		)
		.add(new Command("status", "Checking the status of tracked files"))
		.add(new Command("diff", "Show changed data"))
		.add(new Command("size", "Size of snapshots"))
		.add(new Command("import", "Import snapshot from a tar.gz archive")
			.add(new Argument("archive", "The path to the tar.gz archive file").required)
			.add(new Option("c", "comment", "Specify comment")
				.optional
				.validateEachWith(
					opt => opt.length > 0,
					"cannot be empty"
				)
			)
			.add(new Option("a", "author", "Specify author")
				.optional
				.validateEachWith(
					opt => opt.length > 0,
					"cannot be empty"
				)
			)
			.add(new Option("e", "email", "Specify email")
				.optional
				.validateEachWith(
					opt => opt.isValidEmail,
					"must contain an email address"
				)
			)
			.add(new Flag(null, "no-pre", "Execution without running pre-execution commands")
				.name("nopre")
				.optional
			)
			.add(new Flag(null, "no-post", "Execution without running post-execution commands")
				.name("nopost")
				.optional
			)
		)
		.add(new Command("export", "Export snapshot to a tar.gz archive")
			.add(new Argument("path", "Output directory path for the archive").required)
			.add(new Option("s", "snapshot", "Specify snapshot hash")
				.optional
				.validateEachWith(
					opt => opt.isValidHash,
					"must contain snapshot hash provided"
				)
			)
		)
		.add(new Command("create", "Create a new snapshot")
			.add(new Option("c", "comment", "Specify comment")
				.optional
				.validateEachWith(
					opt => opt.length > 0,
					"cannot be empty"
				)
			)
			.add(new Option("a", "author", "Specify author")
				.optional
				.validateEachWith(
					opt => opt.length > 0,
					"cannot be empty"
				)
			)
			.add(new Option("e", "email", "Specify email")
				.optional
				.validateEachWith(
					opt => opt.isValidEmail,
					"must contain an email address"
				)
			)
			.add(new Flag(null, "no-pre", "Execution without running pre-execution commands")
				.name("nopre")
				.optional
			)
			.add(new Flag(null, "no-post", "Execution without running post-execution commands")
				.name("nopost")
				.optional
			)
		)
		.add(new Command("list", "List of snapshots")
			.add(new Flag("c", "comment", "Show comment")
				.name("comment")
				.optional
			)
			.add(new Flag("a", "author", "Show author")
				.name("author")
				.optional
			)
			.add(new Flag("e", "email", "Show email")
				.name("email")
				.optional
			)
		)
		.add(new Command("restore", "Restore to the specified snapshot state")
			.add(new Argument("snapshot", "Specify snapshot hash").required)
			.add(new Flag(null, "no-pre", "Execution without running pre-execution commands")
				.name("nopre")
				.optional
			)
			.add(new Flag(null, "no-post", "Execution without running post-execution commands")
				.name("nopost")
				.optional
			)
		)
		.add(new Option("c", "config", "Configuration file path")
			.optional
			.validateEachWith(
				opt => opt.exists && opt.isFile,
				"must specify the path to the JSON file"
			)
		)
		.parse(args);

	string configFile = argumets.option("config", "snag.json");

	SnagConfig config;

	try {
		config = new SnagConfig(configFile);
	} catch (SnagConfigException e) {
		e.print();
		return EXIT_FAILURE;
	}

	auto snag = new Snag(config);

	try {
		argumets
			.on("init", init =>
				snag.initialize(init.flag("force"))
			)
			.on("diff", diff =>
				snag.diff()
			)
			.on("size", size =>
				snag.size()
			)
			.on("status", status =>
				snag.status()
			)
			.on("create", (create) {
				create.flag("nopre") || snag.executePreSnag();
				snag.create(
					create.option("comment", ""),
					create.option("author", ""),
					create.option("email", "")
				);
				create.flag("nopost") || snag.executePostSnag();
			})
			.on("list", list =>
				snag.list(
					list.flag("comment"),
					list.flag("author"),
					list.flag("email")
				)
			)
			.on("restore", (restore) {
				restore.flag("nopre") || snag.executePreSnag();
				snag.restore(restore.arg("snapshot"));
				restore.flag("nopost") || snag.executePostSnag();
			})
			.on("export", e =>
				snag.exportSnapshot(
					e.arg("path"),
					e.option("snapshot", ""),
				)
			)
			.on("import", (i) {
				i.flag("nopre") || snag.executePreSnag();
				snag.importSnapshot(
					i.arg("archive"),
					i.option("comment", ""),
					i.option("author", ""),
					i.option("email", "")
				);
				i.flag("nopost") || snag.executePostSnag();
			})
			.on("rules", (r) {
					auto rules = new SnagRules(config);
					r
						.on("update", update =>
							rules.update(update.flag("remove"))
						)
						.on("reset", reset =>
							rules.reset()
						)
						.on("clear", clear =>
							rules.clear()
						)
						.on("save", clear =>
							rules.save()
						)
						.on("show", show =>
							rules.show(show.flag("config"))
						);
				}
			);
	} catch (SnagException e) {
		e.print();
		return EXIT_FAILURE;
	} catch (Exception e) {
		writeln(
			"AN UNEXPECTED ERROR HAS OCCURRED!\n",
			"PLEASE REPORT IT TO THE AUTHOR OF THE SNAG: ",
			"alexander@zhirov.kz (Alexander Zhirov)\n\n",
			e
		);
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}