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

//	ENiGMA½
const MenuModule		= require('../core/menu_module.js').MenuModule;
const ViewController	= require('../core/view_controller.js').ViewController;
const ansi				= require('../core/ansi_term.js');
const theme				= require('../core/theme.js');
const FileEntry			= require('../core/file_entry.js');
const stringFormat		= require('../core/string_format.js');
const createCleanAnsi	= require('../core/string_util.js').createCleanAnsi;
const FileArea			= require('../core/file_base_area.js');
const Errors			= require('../core/enig_error.js').Errors;
const ErrNotEnabled		= require('../core/enig_error.js').ErrorReasons.NotEnabled;
const ArchiveUtil		= require('../core/archive_util.js');
const Config			= require('../core/config.js').config;
const DownloadQueue		= require('../core/download_queue.js');
const FileAreaWeb		= require('../core/file_area_web.js');
const FileBaseFilters	= require('../core/file_base_filter.js');
const resolveMimeType	= require('../core/mime_util.js').resolveMimeType;

const cleanControlCodes	= require('../core/string_util.js').cleanControlCodes;

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

exports.moduleInfo = {
	name	: 'File Area List',
	desc	: 'Lists contents of file an file area',
	author	: 'NuSkooler',
};

const FormIds = {
	browse			: 0,
	details			: 1,
	detailsGeneral	: 2,
	detailsNfo		: 3,
	detailsFileList	: 4,
};

const MciViewIds = {
	browse	: {
		desc				: 1,
		navMenu				: 2,

		customRangeStart	: 10,	//	10+ = customs
	},
	details	: {
		navMenu				: 1,
		infoXyTop			: 2,	//	%XY starting position for info area
		infoXyBottom		: 3,

		customRangeStart	: 10,	//	10+ = customs
	},
	detailsGeneral : {
		customRangeStart	: 10, //	10+ = customs
	},
	detailsNfo : {
		nfo		: 1,

		customRangeStart	: 10,	//	10+ = customs
	},
	detailsFileList : {
		fileList	: 1,

		customRangeStart	: 10,	//	10+ = customs
	},
};

exports.getModule = class FileAreaList extends MenuModule {

	constructor(options) {
		super(options);

		if(options.extraArgs) {
			this.filterCriteria	= options.extraArgs.filterCriteria;
		}

		this.dlQueue = new DownloadQueue(this.client);

		if(!this.filterCriteria) {
			this.filterCriteria = FileBaseFilters.getActiveFilter(this.client);
		}

		if(_.isString(this.filterCriteria)) {
			this.filterCriteria = JSON.parse(this.filterCriteria);
		}

		if(_.has(options, 'lastMenuResult.value')) {
			this.lastMenuResultValue = options.lastMenuResult.value;
		}

		this.menuMethods = {
			nextFile : (formData, extraArgs, cb) => {		
				if(this.fileListPosition + 1 < this.fileList.length) {
					this.fileListPosition += 1;

					return this.displayBrowsePage(true, cb);	//	true=clerarScreen
				}

				return cb(null);
			},
			prevFile : (formData, extraArgs, cb) => {
				if(this.fileListPosition > 0) {
					--this.fileListPosition;

					return this.displayBrowsePage(true, cb);	//	true=clearScreen
				}

				return cb(null);
			},
			viewDetails : (formData, extraArgs, cb) => {
				this.viewControllers.browse.setFocus(false);
				return this.displayDetailsPage(cb);
			},
			detailsQuit : (formData, extraArgs, cb) => {
				this.viewControllers.details.setFocus(false);
				return this.displayBrowsePage(true, cb);	//	true=clearScreen
			},
			toggleQueue : (formData, extraArgs, cb) => {
				this.dlQueue.toggle(this.currentFileEntry);
				this.updateQueueIndicator();
				return cb(null);  
			},
			showWebDownloadLink : (formData, extraArgs, cb) => {
				return this.fetchAndDisplayWebDownloadLink(cb);
			},
			displayHelp : (formData, extraArgs, cb) => {
				return this.displayHelpPage(cb);
			}
		};
	}

	enter() {
		super.enter();
	}

	leave() {
		super.leave();
	}

	getSaveState() {
		return {
			fileList			: this.fileList,
			fileListPosition	: this.fileListPosition,
		};
	}

	restoreSavedState(savedState) {
		if(savedState) {
			this.fileList			= savedState.fileList;
			this.fileListPosition	= savedState.fileListPosition;
		}
	}

	updateFileEntryWithMenuResult(cb) {
		if(!this.lastMenuResultValue) {
			return cb(null);
		}

		if(_.isNumber(this.lastMenuResultValue.rating)) {
			const fileId = this.fileList[this.fileListPosition];
			FileEntry.persistUserRating(fileId, this.client.user.userId, this.lastMenuResultValue.rating, err => {
				if(err) {
					this.client.log.warn( { error : err.message, fileId : fileId }, 'Failed to persist file rating' );
				}
				return cb(null);
			});
		} else {
			return cb(null);
		}
	}

	initSequence() {
		const self = this;

		async.series(
			[
				function preInit(callback) {
					return self.updateFileEntryWithMenuResult(callback);
				},
				function beforeArt(callback) {
					return self.beforeArt(callback);
				},
				function display(callback) {
					return self.displayBrowsePage(false, err => {
						if(err && 'NORESULTS' === err.reasonCode) {
							self.gotoMenu(self.menuConfig.config.noResultsMenu || 'fileBaseListEntriesNoResults');
						}
						return callback(err);
					});
				}
			],
			() => {
				self.finishedLoading();
			}
		);
	}

	populateCurrentEntryInfo(cb) {
		const config		= this.menuConfig.config;
		const currEntry		= this.currentFileEntry;

		const uploadTimestampFormat = config.browseUploadTimestampFormat || config.uploadTimestampFormat || 'YYYY-MMM-DD';
		const area					= FileArea.getFileAreaByTag(currEntry.areaTag);
		const hashTagsSep			= config.hashTagsSep || ', ';
		const isQueuedIndicator		= config.isQueuedIndicator || 'Y';
		const isNotQueuedIndicator	= config.isNotQueuedIndicator || 'N';
		
		const entryInfo = currEntry.entryInfo = {
			fileId				: currEntry.fileId,
			areaTag				: currEntry.areaTag,
			areaName			: area.name || 'N/A',
			areaDesc			: area.desc || 'N/A',
			fileSha256			: currEntry.fileSha256,
			fileName			: currEntry.fileName,
			desc				: currEntry.desc || '',
			descLong			: currEntry.descLong || '',
			userRating			: currEntry.userRating,
			uploadTimestamp		: moment(currEntry.uploadTimestamp).format(uploadTimestampFormat),
			hashTags			: Array.from(currEntry.hashTags).join(hashTagsSep),
			isQueued			: this.dlQueue.isQueued(currEntry) ? isQueuedIndicator : isNotQueuedIndicator,
			webDlLink			: '',	//	:TODO: fetch web any existing web d/l link
			webDlExpire			: '',	//	:TODO: fetch web d/l link expire time			
		};

		//
		//	We need the entry object to contain meta keys even if they are empty as
		//	consumers may very likely attempt to use them
		//
		const metaValues = FileEntry.WellKnownMetaValues;
		metaValues.forEach(name => {
			const value = !_.isUndefined(currEntry.meta[name]) ? currEntry.meta[name] : 'N/A';
			entryInfo[_.camelCase(name)] = value;
		});

		if(entryInfo.archiveType) {
			const mimeType = resolveMimeType(entryInfo.archiveType);
			entryInfo.archiveTypeDesc = mimeType ? _.get(Config, [ 'fileTypes', mimeType, 'desc' ] ) || mimeType : entryInfo.archiveType;
		} else {
			entryInfo.archiveTypeDesc = 'N/A';
		}

		entryInfo.uploadByUsername 	= entryInfo.uploadByUsername || 'N/A';	//	may be imported
		entryInfo.hashTags			= entryInfo.hashTags || '(none)';

		//	create a rating string, e.g. "**---"
		const userRatingTicked		= config.userRatingTicked || '*';
		const userRatingUnticked	= config.userRatingUnticked || '';					
		entryInfo.userRating		= ~~Math.round(entryInfo.userRating) || 0;	//	be safe!
		entryInfo.userRatingString	= new Array(entryInfo.userRating + 1).join(userRatingTicked);
		if(entryInfo.userRating < 5) {
			entryInfo.userRatingString += new Array( (5 - entryInfo.userRating) + 1).join(userRatingUnticked);
		}

		FileAreaWeb.getExistingTempDownloadServeItem(this.client, this.currentFileEntry, (err, serveItem) => {
			if(err) {
				entryInfo.webDlExpire	= '';
				if(ErrNotEnabled === err.reasonCode) {
					entryInfo.webDlExpire	= config.webDlLinkNoWebserver || 'Web server is not enabled';
				} else {
					entryInfo.webDlLink 	= config.webDlLinkNeedsGenerated || 'Not yet generated';					
				}
			} else {
				const webDlExpireTimeFormat = config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

				entryInfo.webDlLink		= serveItem.url;
				entryInfo.webDlExpire	= moment(serveItem.expireTimestamp).format(webDlExpireTimeFormat);
			}

			return cb(null);
		});
	}

	populateCustomLabels(category, startId) {
		return this.updateCustomViewTextsWithFilter(category, startId, this.currentFileEntry.entryInfo);
	}

	displayArtAndPrepViewController(name, options, cb) {
		const self		= this;
		const config	= this.menuConfig.config;

		async.waterfall(
			[
				function readyAndDisplayArt(callback) {
					if(options.clearScreen) {
						self.client.term.rawWrite(ansi.resetScreen());
					}

					theme.displayThemedAsset(
						config.art[name],
						self.client,
						{ font : self.menuConfig.font, trailingLF : false },
						(err, artData) => {
							return callback(err, artData);
						}
					);
				},
				function prepeareViewController(artData, callback) {
					if(_.isUndefined(self.viewControllers[name])) {
						const vcOpts = {
							client		: self.client,
							formId		: FormIds[name],
						};

						if(!_.isUndefined(options.noInput)) {
							vcOpts.noInput = options.noInput;
						}

						const vc = self.addViewController(name, new ViewController(vcOpts));

						if('details' === name) {
							try {
								self.detailsInfoArea = {
									top		: artData.mciMap.XY2.position,
									bottom	: artData.mciMap.XY3.position,
								};
							} catch(e) {
								return callback(Errors.DoesNotExist('Missing XY2 and XY3 position indicators!'));
							}
						}

						const loadOpts = {
							callingMenu		: self,
							mciMap			: artData.mciMap,
							formId			: FormIds[name],
						};

						return vc.loadFromMenuConfig(loadOpts, callback);
					}
					
					self.viewControllers[name].setFocus(true);
					return callback(null);
										
				},
			],
			err => {
				return cb(err);
			}
		);
	}

	displayBrowsePage(clearScreen, cb) {
		const self		= this;

		async.series(
			[
				function fetchEntryData(callback) {
					if(self.fileList) {
						return callback(null);
					}
					return self.loadFileIds(false, callback);	//	false=do not force
				},
				function checkEmptyResults(callback) {
					if(0 === self.fileList.length) {
						return callback(Errors.General('No results for criteria', 'NORESULTS'));
					}
					return callback(null);
				},
				function prepArtAndViewController(callback) {
					return self.displayArtAndPrepViewController('browse', { clearScreen : clearScreen }, callback);
				},
				function loadCurrentFileInfo(callback) {				
					self.currentFileEntry = new FileEntry();

					self.currentFileEntry.load( self.fileList[ self.fileListPosition ], err => {
						if(err) {
							return callback(err);
						}
						
						return self.populateCurrentEntryInfo(callback);
					});
				},
				function populateViews(callback) {
					if(_.isString(self.currentFileEntry.desc)) {
						const descView = self.viewControllers.browse.getView(MciViewIds.browse.desc);
						if(descView) {					
							createCleanAnsi(
								self.currentFileEntry.desc, 
								{ height : self.client.termHeight, width : descView.dimens.width },
								cleanDesc => {
									//	:TODO: use cleanDesc -- need to finish createCleanAnsi() !!
									//descView.setText(cleanDesc);
									descView.setText( self.currentFileEntry.desc );

									self.updateQueueIndicator();
									self.populateCustomLabels('browse', MciViewIds.browse.customRangeStart);

									return callback(null);
								}
							);							
						}
					} else {
						self.updateQueueIndicator();
						self.populateCustomLabels('browse', MciViewIds.browse.customRangeStart);

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

	displayDetailsPage(cb) {
		const self		= this;

		async.series(
			[
				function prepArtAndViewController(callback) {
					return self.displayArtAndPrepViewController('details', { clearScreen : true }, callback);
				},
				function populateViews(callback) {
					self.populateCustomLabels('details', MciViewIds.details.customRangeStart);
					return callback(null);
				},
				function prepSection(callback) {
					return self.displayDetailsSection('general', false, callback);
				},
				function listenNavChanges(callback) {
					const navMenu = self.viewControllers.details.getView(MciViewIds.details.navMenu);
					navMenu.setFocusItemIndex(0);
					
					navMenu.on('index update', index => {
						const sectionName = {
							0	: 'general',
							1	: 'nfo',
							2	: 'fileList',
						}[index];

						if(sectionName) {
							self.displayDetailsSection(sectionName, true);
						}
					});

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

	displayHelpPage(cb) {
		this.displayAsset(
			this.menuConfig.config.art.help,
			{ clearScreen : true },
			() => {
				this.client.waitForKeyPress( () => {
					return this.displayBrowsePage(true, cb);
				});
			}
		);
	}
	
	fetchAndDisplayWebDownloadLink(cb) {
		const self = this;

		async.series(
			[
				function generateLinkIfNeeded(callback) {

					if(self.currentFileEntry.webDlExpireTime < moment()) {
						return callback(null);
					}
					
					const expireTime = moment().add(Config.fileBase.web.expireMinutes, 'minutes');

					FileAreaWeb.createAndServeTempDownload(
						self.client, 
						self.currentFileEntry,
						{ expireTime : expireTime },
						(err, url) => {
							if(err) {
								return callback(err);
							}

							self.currentFileEntry.webDlExpireTime = expireTime;

							const webDlExpireTimeFormat = self.menuConfig.config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

							self.currentFileEntry.entryInfo.webDlLink 	= url;
							self.currentFileEntry.entryInfo.webDlExpire	= expireTime.format(webDlExpireTimeFormat);

							return callback(null);
						}
					);
				},
				function updateActiveViews(callback) {
					self.updateCustomViewTextsWithFilter(
						'browse', 
						MciViewIds.browse.customRangeStart, self.currentFileEntry.entryInfo, 
						{ filter : [ '{webDlLink}', '{webDlExpire}' ] }
					);
					return callback(null);
				}
			],
			err => {
				return cb(err);
			}
		);		
	}

	updateQueueIndicator() {
		const isQueuedIndicator		= this.menuConfig.config.isQueuedIndicator || 'Y';
		const isNotQueuedIndicator	= this.menuConfig.config.isNotQueuedIndicator || 'N';

		this.currentFileEntry.entryInfo.isQueued = stringFormat(
			this.dlQueue.isQueued(this.currentFileEntry) ? 
				isQueuedIndicator : 
				isNotQueuedIndicator
		);

		this.updateCustomViewTextsWithFilter(
			'browse',
			MciViewIds.browse.customRangeStart,
			this.currentFileEntry.entryInfo,
			{ filter : [ '{isQueued}' ] }
		);
	}

	cacheArchiveEntries(cb) {
		//	check cache
		if(this.currentFileEntry.archiveEntries) {
			return cb(null, 'cache');
		}

		const areaInfo = FileArea.getFileAreaByTag(this.currentFileEntry.areaTag);
		if(!areaInfo) {
			return cb(Errors.Invalid('Invalid area tag'));
		}
		
		const filePath		= this.currentFileEntry.filePath;
		const archiveUtil	= ArchiveUtil.getInstance();

		archiveUtil.listEntries(filePath, this.currentFileEntry.entryInfo.archiveType, (err, entries) => {
			if(err) {
				return cb(err);
			}

			this.currentFileEntry.archiveEntries = entries;
			return cb(null, 're-cached');
		});
	}

	populateFileListing() {
		const fileListView = this.viewControllers.detailsFileList.getView(MciViewIds.detailsFileList.fileList);
		
		if(this.currentFileEntry.entryInfo.archiveType) {
			this.cacheArchiveEntries( (err, cacheStatus) => {
				if(err) {
					//	:TODO: Handle me!!!
					fileListView.setItems( [ 'Failed getting file listing' ] );	//	:TODO: make this not suck
					return;
				}

				if('re-cached' === cacheStatus) {
					const fileListEntryFormat 		= this.menuConfig.config.fileListEntryFormat || '{fileName} {fileSize}';	//	:TODO: use byteSize here?
					const focusFileListEntryFormat	= this.menuConfig.config.focusFileListEntryFormat || fileListEntryFormat;
					
					fileListView.setItems( this.currentFileEntry.archiveEntries.map( entry => stringFormat(fileListEntryFormat, entry) ) );
					fileListView.setFocusItems( this.currentFileEntry.archiveEntries.map( entry => stringFormat(focusFileListEntryFormat, entry) ) );

					fileListView.redraw();
				}
			});
		} else {
			fileListView.setItems( [ stringFormat(this.menuConfig.config.notAnArchiveFormat || 'Not an archive', { fileName : this.currentFileEntry.fileName } ) ] );	
		}
	}

	displayDetailsSection(sectionName, clearArea, cb) {
		const self		= this;
		const name		= `details${_.upperFirst(sectionName)}`;

		async.series(
			[
				function detachPrevious(callback) {
					if(self.lastDetailsViewController) {
						self.lastDetailsViewController.detachClientEvents();
					}
					return callback(null); 
				},
				function prepArtAndViewController(callback) {

					function gotoTopPos() {
						self.client.term.rawWrite(ansi.goto(self.detailsInfoArea.top[0], 1));
					}

					gotoTopPos();  

					if(clearArea) {
						self.client.term.rawWrite(ansi.reset());

						let pos 		= self.detailsInfoArea.top[0];
						const bottom	= self.detailsInfoArea.bottom[0];

						while(pos++ <= bottom) {
							self.client.term.rawWrite(ansi.eraseLine() + ansi.down());
						}

						gotoTopPos();
					}

					return self.displayArtAndPrepViewController(name, { clearScreen : false, noInput : true }, callback);
				},
				function populateViews(callback) {
					self.lastDetailsViewController = self.viewControllers[name];

					switch(sectionName) {
						case 'nfo' :
							{
								const nfoView = self.viewControllers.detailsNfo.getView(MciViewIds.detailsNfo.nfo);
								if(nfoView) {
									nfoView.setText(self.currentFileEntry.entryInfo.descLong);
								}
							}
							break;

						case 'fileList' :
							self.populateFileListing();
							break;
					}

					self.populateCustomLabels(name, MciViewIds[name].customRangeStart);
					return callback(null);
				}
			],
			err => {
				if(cb) {
					return cb(err);
				}
			}
		);
	}

	loadFileIds(force, cb) {
		if(force || (_.isUndefined(this.fileList) || _.isUndefined(this.fileListPosition))) {
			this.fileListPosition	= 0;
			FileEntry.findFiles(this.filterCriteria, (err, fileIds) => {
				this.fileList = fileIds;
				return cb(err);
			});
		}
	}
};