/* jslint node: true */
'use strict';

//	ENiGMA½
const MenuModule			= require('../core/menu_module.js').MenuModule;
const getModDatabasePath	= require('../core/database.js').getModDatabasePath;
const ViewController		= require('../core/view_controller.js').ViewController;
const theme					= require('../core/theme.js');
const ansi					= require('../core/ansi_term.js');

//	deps
const sqlite3				= require('sqlite3');
const async					= require('async');
const _						= require('lodash');
const moment				= require('moment');

exports.moduleInfo = {
	name		: 'Onelinerz',
	desc		: 'Standard local onelinerz',
	author		: 'NuSkooler',
	packageName	: 'codes.l33t.enigma.onelinerz',
};

exports.getModule	= OnelinerzModule;

const MciCodeIds = {
	ViewForm	:  {
		Entries		: 1,
		AddPrompt	: 2,
	},
	AddForm : {
		NewEntry		: 1,
		EntryPreview	: 2,
		AddPrompt		: 3,
	}
};

const FormIds = {
	View	: 0,
	Add		: 1,
};

function OnelinerzModule(options) {
	MenuModule.call(this, options);

	const self		= this;
	const config	= this.menuConfig.config;

	this.initSequence = function() {
		async.series(
			[
				function beforeDisplayArt(callback) {
					self.beforeArt(callback);
				},
				function display(callback) {
					self.displayViewScreen(false, callback);
				}
			],
			err => {
				if(err) {
					//	:TODO: Handle me -- initSequence() should really take a completion callback
				}
				self.finishedLoading();
			}
		);
	};

	this.displayViewScreen = function(clearScreen, cb) {
		async.waterfall(
			[
				function clearAndDisplayArt(callback) {
					if(self.viewControllers.add) {
						self.viewControllers.add.setFocus(false);
					}

					if(clearScreen) {
						self.client.term.rawWrite(ansi.resetScreen());
					}

					theme.displayThemedAsset(
						config.art.entries,
						self.client,
						{ font : self.menuConfig.font, trailingLF : false },
						(err, artData) => {
							return callback(err, artData);
						}
					);
				},
				function initOrRedrawViewController(artData, callback) {
					if(_.isUndefined(self.viewControllers.add)) {
						const vc = self.addViewController(
							'view', 
							new ViewController( { client : self.client, formId : FormIds.View } )
						);

						const loadOpts = {
							callingMenu		: self,
							mciMap			: artData.mciMap,
							formId			: FormIds.View,
						};

						return vc.loadFromMenuConfig(loadOpts, callback);
					} else {
						self.viewControllers.view.setFocus(true);
						self.viewControllers.view.getView(MciCodeIds.ViewForm.AddPrompt).redraw();						
						return callback(null);
					}
				},
				function fetchEntries(callback) {
					const entriesView = self.viewControllers.view.getView(MciCodeIds.ViewForm.Entries);
					const limit = entriesView.dimens.height;
					let entries = [];

					self.db.each(
						`SELECT *
						FROM (
							SELECT * 
							FROM onelinerz
							ORDER BY timestamp DESC
							LIMIT ${limit}
							)
						ORDER BY timestamp ASC;`,
						(err, row) => {
							if(!err) {
								row.timestamp = moment(row.timestamp);	//	convert -> moment
								entries.push(row);
							}
						},
						err => {
							return callback(err, entriesView, entries);
						}
					);
				},
				function populateEntries(entriesView, entries, callback) {
					const listFormat	= config.listFormat || '{username}@{ts}: {oneliner}';//	:TODO: should be userName to be consistent
					const tsFormat		= config.timestampFormat || 'ddd h:mma';

					entriesView.setItems(entries.map( e => {
						return listFormat.format( {
							userId		: e.user_id,
							username	: e.user_name,
							oneliner	: e.oneliner,
							ts			: e.timestamp.format(tsFormat),
						} );
					}));

					entriesView.focusItems = entriesView.items;	//	:TODO: this is a hack
					entriesView.redraw();

					return callback(null);
				}
			],
			err => {
				if(cb) {
					return cb(err);
				}
			}
		);
	};

	this.displayAddScreen = function(cb) {
		async.waterfall(
			[
				function clearAndDisplayArt(callback) {
					self.viewControllers.view.setFocus(false);
					self.client.term.rawWrite(ansi.resetScreen());					

					theme.displayThemedAsset(
						config.art.add,
						self.client,
						{ font : self.menuConfig.font },
						(err, artData) => {
							return callback(err, artData);
						}
					);
				},
				function initOrRedrawViewController(artData, callback) {
					if(_.isUndefined(self.viewControllers.add)) {
						const vc = self.addViewController(
							'add', 
							new ViewController( { client : self.client, formId : FormIds.Add } )
						);

						const loadOpts = {
							callingMenu		: self,
							mciMap			: artData.mciMap,
							formId			: FormIds.Add,
						};

						return vc.loadFromMenuConfig(loadOpts, callback);
					} else {
						self.viewControllers.add.setFocus(true);
						self.viewControllers.add.redrawAll();
						self.viewControllers.add.switchFocus(MciCodeIds.AddForm.NewEntry);
						return callback(null);
					}
				}
			],
			err => {
				if(cb) {
					return cb(err);
				}
			}
		);
	};

	this.clearAddForm = function() {
		const newEntryView	= self.viewControllers.add.getView(MciCodeIds.AddForm.NewEntry);
		const previewView	= self.viewControllers.add.getView(MciCodeIds.AddForm.EntryPreview);

		newEntryView.setText('');
		
		//	preview is optional
		if(previewView) {
			previewView.setText('');
		}
	};

	this.menuMethods = {
		viewAddScreen : function() {
			self.displayAddScreen();
		},

		addEntry : function(formData) {
			if(_.isString(formData.value.oneliner) && formData.value.oneliner.length > 0) {
				const oneliner = formData.value.oneliner.trim();	//	remove any trailing ws

				self.storeNewOneliner(oneliner, err => {
					if(err) {
						self.client.log.warn( { error : err.message }, 'Failed saving oneliner');
					}

					self.clearAddForm(); 
					self.displayViewScreen(true);	//	true=cls
				});

			} else {
				//	empty message - treat as if cancel was hit
				self.displayViewScreen(true);	//	true=cls
			}
		},

		cancelAdd : function() {
			self.clearAddForm();
			self.displayViewScreen(true);	//	true=cls
		}
	};

	this.initDatabase = function(cb) {
		async.series(
			[
				function openDatabase(callback) {
					self.db = new sqlite3.Database(
						getModDatabasePath(exports.moduleInfo), 
						callback
					);
				},
				function createTables(callback) {
					self.db.serialize( () => {
						self.db.run(
							`CREATE TABLE IF NOT EXISTS onelinerz (
								id				INTEGER PRIMARY KEY,
								user_id			INTEGER_NOT NULL,
								user_name		VARCHAR NOT NULL,								
								oneliner		VARCHAR NOT NULL,
								timestamp		DATETIME NOT NULL
							)`
						);
					});
					callback(null);
				}
			],
			cb
		);
	};

	this.storeNewOneliner = function(oneliner, cb) {
		const ts = moment().format('YYYY-MM-DDTHH:mm:ss.SSSZ');

		async.series(
			[
				function addRec(callback) {
					self.db.run(
						`INSERT INTO onelinerz (user_id, user_name, oneliner, timestamp)
						VALUES (?, ?, ?, ?);`,
						[ self.client.user.userId, self.client.user.username, oneliner, ts ],
						callback
					);
				},
				function removeOld(callback) {
					//	keep 25 max most recent items - remove the older ones
					self.db.run(
						`DELETE FROM onelinerz
						WHERE id IN (
							SELECT id
							FROM onelinerz
							ORDER BY id DESC
							LIMIT -1 OFFSET 25
						);`,
						callback
					);
				}
			],
			cb
		);		
	};
}

require('util').inherits(OnelinerzModule, MenuModule);

OnelinerzModule.prototype.beforeArt = function(cb) {
	OnelinerzModule.super_.prototype.beforeArt.call(this, err => {
		return err ? cb(err) : this.initDatabase(cb);				
	});
};