"use strict";

const fs = require('fs');
const glob = require('glob');

const addBranchInfo = (app, options, callback) => {
	const branchFile = app.get('releasepath') + "/" + options.owner + "/" + options.reponame + "/$revs/" + options.rev + ".branch";
	fs.exists(branchFile, (exists) => {
		if (!exists) {
			return callback("BranchFileNotFound", options);
		}
		fs.readFile(branchFile, (err, data) => {
			if (err) {
				return callback(err, options);
			}
			options.branch = data.toString();
			options.branchName = options.branch.split("/").pop();
			return callback(null, options);
		});
	});
};

const addRevInfo = (app, options, callback) => {
	const revFile = app.get('releasepath') + "/" + options.owner + "/" + options.reponame + "/" + options.branch + "/latest.id";
	fs.exists(revFile, (exists) => {
		if (!exists) {
			return callback("RevFileNotFound", options);
		}
		fs.readFile(revFile, (err, data) => {
			if (err) {
				return callback(err, options);
			}
			options.rev = data.toString();
			return callback(null, options);
		});
	});
};

const parseOptions = (app, options, callback) => {
	const result = {};

	result.owner = options.owner;
	result.reponame = options.reponame;

	if (options.rev && !(/^[\da-f]{40}$/i).test(options.rev)) {
		return callback("Wrong rev format: " + options.rev, options);
	}

	if (options.rev) {
		result.rev = options.rev;
		return addBranchInfo(app, result, callback);
	} else if (/^[\da-f]{40}$/i.test(options.branchName)) {
		result.rev = options.branchName;
		return addBranchInfo(app, result, callback);
	} else {
		result.branchName = options.branchName || "master";
		result.branch = "refs/heads/" + result.branchName;
		return addRevInfo(app, result, callback);
	}
};

const loadReport = (app, options, callback) => {
	const releaseDir = app.get('releasepath') + "/" + options.owner + "/" + options.reponame + "/" + options.branch + "/" + options.rev;

	glob("**", {cwd: releaseDir, mark: true}, (err, files) => {
		if (err) {
			return callback(err, options);
		}

		const reportFile = releaseDir + "/report.json";
		options.files = files;
		fs.exists(reportFile, (exists) => {
			if (!exists) {
				return callback("ReportFileNotFound", options);
			}

			fs.readFile(reportFile, (err, dataBuffer) => {
				if (err) {
					return callback(err, options);
				}
				const data = dataBuffer.toString();
				if (!data) {
					return callback("ReportFileNotFound", options);
				}
				options.report = JSON.parse(data);
				return callback(null, options);
			});
		});
	});
};

exports.getReport = (app, options, callback) => parseOptions(app, options, (err, result) => {
	if (err) {
		return callback(err, {});
	}

	return loadReport(app, result, callback);
});