/* jslint node: true */
/* eslint-disable no-console */
'use strict';

//	ENiGMA½
const resolvePath				= require('../../core/misc_util.js').resolvePath;
const printUsageAndSetExitCode	= require('./oputil_common.js').printUsageAndSetExitCode;
const ExitCodes					= require('./oputil_common.js').ExitCodes;
const argv						= require('./oputil_common.js').argv;
const getConfigPath				= require('./oputil_common.js').getConfigPath;
const getHelpFor				= require('./oputil_help.js').getHelpFor;
const initConfigAndDatabases	= require('./oputil_common.js').initConfigAndDatabases;
const Errors					= require('../../core/enig_error.js').Errors;

//	deps
const async			= require('async');
const inq			= require('inquirer');
const mkdirsSync	= require('fs-extra').mkdirsSync;
const fs			= require('graceful-fs');
const hjson			= require('hjson');
const paths			= require('path');
const _				= require('lodash');

exports.handleConfigCommand				= handleConfigCommand;


function getAnswers(questions, cb) {
	inq.prompt(questions).then( answers => {
		return cb(answers);
	});
}

const QUESTIONS = {
	Intro		: [
		{
			name	: 'createNewConfig',
			message	: 'Create a new configuration?',
			type	: 'confirm',
			default	: false,
		},
		{
			name	: 'configPath',
			message	: 'Configuration path:',
			default	: getConfigPath(),
			when	: answers => answers.createNewConfig
		},	
	],
	
	OverwriteConfig	: [
		{
			name	: 'overwriteConfig',
			message	: 'Config file exists. Overwrite?',
			type	: 'confirm',
			default	: false,
		}
	],
	
	Basic			: [
		{
			name	: 'boardName',
			message	: 'BBS name:',
			default	: 'New ENiGMA½ BBS',
		},
	],
	
	Misc		: [
		{
			name	: 'loggingLevel',
			message	: 'Logging level:',
			type	: 'list',
			choices	: [ 'Error', 'Warn', 'Info', 'Debug', 'Trace' ],
			default	: 2,
			filter	: s => s.toLowerCase(),
		},
		{
			name	: 'sevenZipExe',
			message	: '7-Zip executable:',
			type	: 'list',
			choices	: [ '7z', '7za', 'None' ]
		}
	],
	
	MessageConfAndArea	: [
		{
			name	: 'msgConfName',
			message	: 'First message conference:',
			default	: 'Local',
		},
		{
			name	: 'msgConfDesc',
			message	: 'Conference description:',
			default	: 'Local Areas',	
		},
		{
			name	: 'msgAreaName',
			message	: 'First area in message conference:',
			default	: 'General',
		},
		{
			name	: 'msgAreaDesc',
			message	: 'Area description:',
			default	: 'General chit-chat',
		}
	]
};

function makeMsgConfAreaName(s) {
	return s.toLowerCase().replace(/\s+/g, '_');
}

function askNewConfigQuestions(cb) {
	
	const ui = new inq.ui.BottomBar();
	
	let configPath;
	let config;
	
	async.waterfall(
		[
			function intro(callback) {
				getAnswers(QUESTIONS.Intro, answers => {
					if(!answers.createNewConfig) {
						return callback('exit');
					}
					
					//	adjust for ~ and the like
					configPath = resolvePath(answers.configPath);
					
					const configDir = paths.dirname(configPath);
					mkdirsSync(configDir);
					
					//
					//	Check if the file exists and can be written to
					//
					fs.access(configPath, fs.F_OK | fs.W_OK, err => {
						if(err) {
							if('EACCES' === err.code) {
								ui.log.write(`${configPath} cannot be written to`);
								callback('exit');
							} else if('ENOENT' === err.code) {
								callback(null, false);
							}	
						} else {
							callback(null, true);	//	exists + writable
						}
					});
				});
			},
			function promptOverwrite(needPrompt, callback) {		
				if(needPrompt) {
					getAnswers(QUESTIONS.OverwriteConfig, answers => {
						callback(answers.overwriteConfig ? null : 'exit');
					});
				} else {
					callback(null);
				}
			},
			function basic(callback) {				
				getAnswers(QUESTIONS.Basic, answers => {
					config = {
						general : {
							boardName : answers.boardName,
						},
					};
					
					callback(null);
				});
			},
			function msgConfAndArea(callback) {
				getAnswers(QUESTIONS.MessageConfAndArea, answers => {
					config.messageConferences = {};
					
					const confName	= makeMsgConfAreaName(answers.msgConfName);
					const areaName	= makeMsgConfAreaName(answers.msgAreaName);
					
					config.messageConferences[confName] = {
						name	: answers.msgConfName,
						desc	: answers.msgConfDesc,
						sort	: 1,
						default	: true,
					};
					
					config.messageConferences.another_sample_conf = {
						name	: 'Another Sample Conference',
						desc	: 'Another conference example. Change me!',
						sort	: 2,	
					};
					
					config.messageConferences[confName].areas = {};
					config.messageConferences[confName].areas[areaName] = {
						name	: answers.msgAreaName,
						desc	: answers.msgAreaDesc,
						sort	: 1,
						default	: true,	
					};
					
					config.messageConferences.another_sample_conf = {
						name	: 'Another Sample Conference',
						desc	: 'Another conf sample. Change me!',

						areas :  {
							another_sample_area : {
								name	: 'Another Sample Area',
								desc	: 'Another area example. Change me!',
								sort	: 2
							}
						}
					};
					
					callback(null);
				});
			},
			function misc(callback) {
				getAnswers(QUESTIONS.Misc, answers => {
					if('None' !== answers.sevenZipExe) {
						config.archivers = {
							zip : {
								compressCmd		: answers.sevenZipExe,
								decompressCmd	: answers.sevenZipExe,
							}
						};
					}
					
					config.logging = {
						level : answers.loggingLevel,
					};
					
					callback(null);
				});
			}
		],
		err => {
			cb(err, configPath, config);
		}
	);
}

function writeConfig(config, path) {
	config = hjson.stringify(config, { bracesSameLine : true, spaces : '\t', keepWsc : true, quotes : 'strings' } );
	
	try {
		fs.writeFileSync(path, config, 'utf8');
		return true;
	} catch(e) {
		return false;
	}	
}

function buildNewConfig() {
	askNewConfigQuestions( (err, configPath, config) => {
		if(err) {								
			return;
		}

		if(writeConfig(config, configPath)) {
			console.info('Configuration generated');
		} else {
			console.error('Failed writing configuration');
		}
	});
}

function validateUplinks(uplinks) {
	const ftnAddress = require('../../core/ftn_address.js');
	const valid = uplinks.every(ul => {
		const addr = ftnAddress.fromString(ul);
		return addr;
	});
	return valid;
}

function getMsgAreaImportType(path) {
	if(argv.type) {
		return argv.type.toLowerCase();
	}

	const ext = paths.extname(path).toLowerCase().substr(1);
	return ext;	//	.bbs|.na|...
}

function importAreas() {
	const importPath = argv._[argv._.length - 1];
	if(argv._.length < 3 || !importPath || 0 === importPath.length) {
		return printUsageAndSetExitCode(getHelpFor('Config'), ExitCodes.ERROR);
	}

	const importType = getMsgAreaImportType(importPath);
	if('na' !== importType && 'bbs' !== importType) {
		return console.error(`"${importType}" is not a recognized import file type`);
	}

	//	optional data - we'll prompt if for anything not found
	let confTag		= argv.conf;
	let networkName	= argv.network;
	let uplinks		= argv.uplinks;
	if(uplinks) {
		uplinks = uplinks.split(/[\s,]+/);		
	}

	let importEntries;

	async.waterfall(
		[
			function readImportFile(callback) {
				fs.readFile(importPath, 'utf8', (err, importData) => {
					if(err) {
						return callback(err);
					}

					importEntries = getImportEntries(importType, importData);
					if(0 === importEntries.length) {
						return callback(Errors.Invalid('Invalid or empty import file'));
					}

					//	We should have enough to validate uplinks
					if('bbs' === importType) {
						for(let i = 0; i < importEntries.length; ++i) {
							if(!validateUplinks(importEntries[i].uplinks)) {
								return callback(Errors.Invalid('Invalid uplink(s)'));	
							}
						}
					} else {
						if(!validateUplinks(uplinks)) {
							return callback(Errors.Invalid('Invalid uplink(s)'));
						}
					}

					return callback(null);
				});
			},
			function init(callback) {
				return initConfigAndDatabases(callback);
			},
			function validateAndCollectInput(callback) {
				const msgArea	= require('../../core/message_area.js');
				const Config	= require('../../core/config.js').config;

				let msgConfs = msgArea.getSortedAvailMessageConferences(null, { noClient : true } );
				if(!msgConfs) {
					return callback(Errors.DoesNotExist('No conferences exist in your configuration'));
				}

				msgConfs = msgConfs.map(mc => {
					return {
						name	: mc.conf.name,
						value	: mc.confTag,
					};
				});

				if(confTag && !msgConfs.find(mc => {
					return confTag === mc.value;
				}))
				{
					return callback(Errors.DoesNotExist(`Conference "${confTag}" does not exist`));
				}

				let existingNetworkNames = [];
				if(_.has(Config, 'messageNetworks.ftn.networks')) {
					existingNetworkNames = Object.keys(Config.messageNetworks.ftn.networks);
				}

				if(0 === existingNetworkNames.length) {
					return callback(Errors.DoesNotExist('No FTN style networks exist in your configuration'));
				}

				if(networkName && !existingNetworkNames.find(net => networkName === net)) {
					return callback(Errors.DoesNotExist(`FTN style Network "${networkName}" does not exist`));
				}
				
				getAnswers([
					{
						name		: 'confTag',
						message		: 'Message conference:',
						type		: 'list',
						choices		: msgConfs,
						pageSize	: 10,
						when		: !confTag,
					},
					{
						name		: 'networkName',
						message		: 'Network name:',
						type		: 'list',
						choices		: existingNetworkNames,
						when		: !networkName,
					},
					{
						name		: 'uplinks',
						message		: 'Uplink(s) (comma separated):',
						type		: 'input',
						validate	: (input) => {								
							const inputUplinks = input.split(/[\s,]+/);
							return validateUplinks(inputUplinks) ? true : 'Invalid uplink(s)';
						},
						when		: !uplinks && 'bbs' !== importType,
					}
				], 
				answers => {
					confTag			= confTag || answers.confTag;
					networkName		= networkName || answers.networkName;
					uplinks			= uplinks || answers.uplinks;

					importEntries.forEach(ie => {
						ie.areaTag = ie.ftnTag.toLowerCase();
					});

					return callback(null);
				});
			},
			function confirmWithUser(callback) {
				const Config	= require('../../core/config.js').config;

				console.info(`Importing the following for "${confTag}" - (${Config.messageConferences[confTag].name} - ${Config.messageConferences[confTag].desc})`);
				importEntries.forEach(ie => {
					console.info(`  ${ie.ftnTag} - ${ie.name}`);
				});
				
				console.info('');
				console.info('Importing will NOT create required FTN network configurations.');
				console.info('If you have not yet done this, you will need to complete additional steps after importing.');
				console.info('See docs/msg_networks.md for details.');
				console.info('');

				getAnswers([
					{
						name	: 'proceed',
						message	: 'Proceed?',
						type	: 'confirm',
					}
				],
				answers => {
					return callback(answers.proceed ? null : Errors.General('User canceled'));
				});

			},
			function loadConfigHjson(callback) {
				const configPath = getConfigPath();
				fs.readFile(configPath, 'utf8', (err, confData) => {
					if(err) {
						return callback(err);
					}

					let config;
					try {
						config = hjson.parse(confData, { keepWsc : true } );
					} catch(e) {
						return callback(e);
					}
					return callback(null, config);

				});
			},
			function performImport(config, callback) {
				const confAreas = { messageConferences : {} };
				confAreas.messageConferences[confTag] = { areas : {} };

				const msgNetworks = { messageNetworks : { ftn : { areas : {} } } };

				importEntries.forEach(ie => {
					const specificUplinks = ie.uplinks || uplinks;	//	AREAS.BBS has specific uplinks per area

					confAreas.messageConferences[confTag].areas[ie.areaTag] = {
						name : ie.name,
						desc : ie.name,
					};

					msgNetworks.messageNetworks.ftn.areas[ie.areaTag] = {
						network	: networkName,
						tag		: ie.ftnTag,
						uplinks	: specificUplinks
					};
				});
				

				const newConfig = _.defaultsDeep(config, confAreas, msgNetworks);
				const configPath = getConfigPath();

				if(!writeConfig(newConfig, configPath)) {
					return callback(Errors.UnexpectedState('Failed writing configuration'));
				}

				return callback(null);
			}
		],
		err => {
			if(err) {
				console.error(err.reason ? err.reason : err.message);
			} else {
				const addFieldUpd = 'bbs' === importType ? '"name" and "desc"' : '"desc"';
				console.info('Configuration generated.');
				console.info(`You may wish to validate changes made to ${getConfigPath()}`);
				console.info(`as well as update ${addFieldUpd} fields, sorting, etc.`);
				console.info('');
			}
		}
	);
	
}

function getImportEntries(importType, importData) {
	let importEntries = [];

	if('na' === importType) {
		//
		//	parse out
		//	TAG		DESC
		//
		const re = /^([^\s]+)\s+([^\r\n]+)/gm;
		let m;
		
		while( (m = re.exec(importData) )) {
			importEntries.push({
				ftnTag		: m[1],
				name		: m[2],
			});
		}
	} else if ('bbs' === importType) {
		//
		//	Various formats for AREAS.BBS seem to exist. We want to support as much as possible.
		//
		//	SBBS http://www.synchro.net/docs/sbbsecho.html#AREAS.BBS
		//	CODE	TAG		UPLINKS
		//
		//	VADV https://www.vadvbbs.com/products/vadv/support/docs/docs_vfido.php#AREAS.BBS
		//	TAG		UPLINKS
		//
		//	Misc
		//	PATH|OTHER	TAG		UPLINKS
		//
		//	Assume the second item is TAG and 1:n UPLINKS (space and/or comma sep) after (at the end)
		//
		const re = /^[^\s]+\s+([^\s]+)\s+([^\n]+)$/gm;
		let m;
		while ( (m = re.exec(importData) )) {
			const tag = m[1];

			importEntries.push({
				ftnTag		: tag,
				name		: `Area: ${tag}`,
				uplinks		: m[2].split(/[\s,]+/),
			});
		}
	}

	return importEntries;
}

function handleConfigCommand() {
	if(true === argv.help) {
		return printUsageAndSetExitCode(getHelpFor('Config'), ExitCodes.ERROR);
	}

	const action = argv._[1];

	switch(action) {
		case 'new' 			: return buildNewConfig();
		case 'import-areas' : return importAreas();

		default : return printUsageAndSetExitCode(getHelpFor('Config'), ExitCodes.ERROR);
	}
}