package.js

var through = require('through2');
var gutil = require('gulp-util');
var path = require('path');
var fs = require('fs');
var check = require('validator');
var shell = require('shelljs');
var Q = require('q');
var os = require('os');
var cp = require('child_process');

var _strRelPath = path.join('Strings', 'resources.resjson', 'en-US');

var _tempPath = path.join(__dirname, '_temp');
shell.mkdir('-p', _tempPath);

var createError = function(msg) {
	return new gutil.PluginError('PackageTask', msg);
}

var validateModule = function(folderName, module) {
    var defer = Q.defer();
    defer.resolve();
    return defer.promise;
}

var validateTask = function(folderName, task) {
	var defer = Q.defer();

	var vn = (task.name  || folderName);

	if (!task.id || !check.isUUID(task.id)) {
		defer.reject(createError(vn + ': id is a required guid'));
	};

	if (!task.name || !check.isAlphanumeric(task.name)) {
		defer.reject(createError(vn + ': name is a required alphanumeric string'));
	}

	if (!task.friendlyName || !check.isLength(task.friendlyName, 1, 40)) {
		defer.reject(createError(vn + ': friendlyName is a required string <= 40 chars'));
	}

	if (!task.instanceNameFormat) {
		defer.reject(createError(vn + ': instanceNameFormat is required'));	
	}

	// resolve if not already rejected
	defer.resolve();
	return defer.promise;
};

var LOC_FRIENDLYNAME = 'loc.friendlyName';
var LOC_HELPMARKDOWN = 'loc.helpMarkDown';
var LOC_DESCRIPTION = 'loc.description';
var LOC_INSTFORMAT = 'loc.instanceNameFormat';
var LOC_GROUPDISPLAYNAME = 'loc.group.displayName.';
var LOC_INPUTLABEL = 'loc.input.label.';
var LOC_INPUTHELP = 'loc.input.help.';
var LOC_MESSAGES = 'loc.messages.';

var createStrings = function(task, pkgPath, srcPath) {
	var defer = Q.defer();

	var strPath = path.join(pkgPath, _strRelPath);
	shell.mkdir('-p', strPath);
	var srcStrPath = path.join(srcPath, _strRelPath);
	shell.mkdir('-p', srcStrPath);

	//
	// Loc tasks.json and product strings content
	//
	var strings = {};
	strings[LOC_FRIENDLYNAME] = task.friendlyName;
	task['friendlyName'] = 'ms-resource:' + LOC_FRIENDLYNAME;
	
	strings[LOC_HELPMARKDOWN] = task.helpMarkDown;
	task['helpMarkDown'] = 'ms-resource:' + LOC_HELPMARKDOWN;

	strings[LOC_DESCRIPTION] = task.description;
	task['description'] = 'ms-resource:' + LOC_DESCRIPTION;

	strings[LOC_INSTFORMAT] = task.instanceNameFormat;
	task['instanceNameFormat'] = 'ms-resource:' + LOC_INSTFORMAT;

	if (task.groups) {
		task.groups.forEach(function(group) {
			if (group.name) {
				var key = LOC_GROUPDISPLAYNAME + group.name;
				strings[key] = group.displayName;
				group.displayName = 'ms-resource:' + key;
			}
		});
	}

	if (task.inputs) {
		task.inputs.forEach(function(input) {
			if (input.name) {
				var labelKey = LOC_INPUTLABEL + input.name;
				strings[labelKey] = input.label;
				input.label = 'ms-resource:' + labelKey; 

				if (input.helpMarkDown) {
					var helpKey = LOC_INPUTHELP + input.name;
					strings[helpKey] = input.helpMarkDown;
					input.helpMarkDown = 'ms-resource:' + helpKey;				
				}				
			}
		});
	}	

	if (task.messages) {
		for(var key in task.messages) {
			var messageKey = LOC_MESSAGES + key;
			strings[messageKey] = task.messages[key];
			task.messages[key] = 'ms-resource:' + messageKey;
		}
	}	
	
	//
	// Write the tasks.json and strings file in package and back to source
	//
	var enPath = path.join(strPath, 'resources.resjson');
	var enSrcPath = path.join(srcStrPath, 'resources.resjson');

	var enContents = JSON.stringify(strings, null, 2);
	fs.writeFile(enPath, enContents, function(err) {
		if (err) {
			defer.reject(createError('could not create: ' + enPath + ' - ' + err.message));
			return;
		}

		var taskPath = path.join(pkgPath, 'task.loc.json');

		var contents = JSON.stringify(task, null, 2);

		fs.writeFile(taskPath, contents, function(err) {
			if (err) {
				defer.reject(createError('could not create: ' + taskPath + ' - ' + err.message));
				return;
			}

			// copy the loc assets back to the src so they can be checked in
			shell.cp('-f', enPath, enSrcPath);
			shell.cp('-f', taskPath, path.join(srcPath, 'task.loc.json'));

			defer.resolve();			
		});

	})

	return defer.promise;
};

function locCommon() {
    return through.obj(
        function(moduleJson, encoding, done) {
            // Validate the module.json file exists.
            if (!fs.existsSync(moduleJson)) {
                new gutil.PluginError('PackageModule', 'Module json cannot be found: ' + moduleJson.path);
            }

            if (moduleJson.isNull() || moduleJson.isDirectory()) {
                this.push(moduleJson);
                return callback();
            }

            // Deserialize the module.json.
            var jsonContents = moduleJson.contents.toString();
            var module = { };
            try {
                module = JSON.parse(jsonContents);
            }
            catch (err) {
                done(createError('Common module ' + moduleJson.path + ' parse error: ' + err.message));
                return;
            }

            // Build the content for the en-US resjson file.
            var strPath = path.join(path.dirname(moduleJson.path), _strRelPath);
            shell.mkdir('-p', strPath);
            var strings = { };
            if (module.messages) {
                for (var key in module.messages) {
                    var messageKey = LOC_MESSAGES + key;
                    strings[messageKey] = module.messages[key];
                }
            }
            
            // Create the en-US resjson file.
            var enPath = path.join(strPath, 'resources.resjson');
            var enContents = JSON.stringify(strings, null, 2);
            fs.writeFile(enPath, enContents, function(err) {
                if (err) {
                    done(createError('Could not create: ' + enPath + ' - ' + err.message));
                    return;
                }
            })

            done();
        });
}

function packageTask(pkgPath, commonDeps, commonSrc){
    return through.obj(
		function(taskJson, encoding, done) {
		    if (!fs.existsSync(taskJson)) {
		        new gutil.PluginError('PackageTask', 'Task json cannot be found: ' + taskJson.path);
		    }

	        if (taskJson.isNull() || taskJson.isDirectory()) {
	            this.push(taskJson);
	            return callback();
	        }

	        var dirName = path.dirname(taskJson.path);
	        var folderName = path.basename(dirName);
	        var jsonContents = taskJson.contents.toString();
	        var task = {};

	        try {
	        	task = JSON.parse(jsonContents);
	        }
	        catch (err) {
	        	done(createError(folderName + ' parse error: ' + err.message));
	        	return;
	        }

	        var tgtPath;

	        validateTask(folderName, task)
	        .then(function() {
                // Copy the task to the layout folder.
                gutil.log('Packaging: ' + task.name);
                tgtPath = path.join(pkgPath, task.name);
                shell.mkdir('-p', tgtPath);
                shell.cp('-R', path.join(dirName, '*'), tgtPath);
                shell.rm(path.join(tgtPath, '*.csproj'));
                shell.rm(path.join(tgtPath, '*.md'));

                // Build a list of external task lib dependencies.
                var externals = require('./externals.json');
                var libDeps = [ ];
                if (task.execution['Node']) {
                    libDeps.push({
                        "name": "vsts-task-lib",
                        "src": "node_modules",
                        "dest": "node_modules"
                    });
                }

                if (task.execution['PowerShell3']) {
                    libDeps.push({
                        "name": "vsts-task-sdk",
                        "src": path.join("node_modules", "vsts-task-sdk", "VstsTaskSdk"),
                        "dest": path.join("ps_modules", "VstsTaskSdk")
                    });
                }

                // Statically link the required external task libs.
                libDeps.forEach(function (libDep) {
                    var libVer = externals[libDep.name];
                    if (!libVer) {
                        throw new Error('External ' + libDep.name + ' not defined in externals.json.');
                    }

                    gutil.log('Linking ' + libDep.name + ' ' + libVer + ' into ' + task.name);
                    var tskLibSrc = path.join(__dirname, '_temp', libDep.name, libVer, libDep.src);
                    if (shell.test('-d', tskLibSrc)) {
                        new gutil.PluginError('PackageTask', libDep.name + ' not found: ' + tskLibSrc);
                    }

                    var dest = path.join(tgtPath, libDep.dest) 
                    shell.mkdir('-p', dest);
                    shell.cp('-R', path.join(tskLibSrc, '*'), dest);
                })

                // Statically link the required internal common modules.
                var taskDeps;
                if ((taskDeps = commonDeps[task.name])) {
                    taskDeps.forEach(function (dep) {
                        gutil.log('Linking ' + dep.module + ' into ' + task.name);
                        var src = path.join(commonSrc, dep.module);
                        var dest = path.join(tgtPath, dep.dest);
                        shell.mkdir('-p', dest);
                        shell.cp('-R', src, dest);
                    })
                }

                // run npm install if packages.json exists
                var pkgJsonPath = path.join(tgtPath, 'package.json');
                var nodeModulesPath = path.join(tgtPath, 'node_modules');
                if (fs.existsSync(pkgJsonPath) && fs.existsSync(nodeModulesPath)) {
                    shell.pushd(tgtPath);
                    gutil.log('package.json exists.  Running npm install');
                    try {
                        cp.execSync('npm install');
                    }
                    catch (err) {
                        new gutil.PluginError('PackageTask', 'npm install failed');
                        throw new Error('npm install failed');
                        gutil.log(err.Message);
                    }
                    shell.popd();
                }

	        	return;
	        })
	        .then(function() {
	        	return createStrings(task, tgtPath, dirName);
	        })
	        .then(function() {
	        	done();
	        })
	        .fail(function(err) {
	        	done(err);
	        })
		});    
}

exports.LocCommon = locCommon;
exports.PackageTask = packageTask;