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

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

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

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);

        this.filterCriteria     = _.get(options, 'extraArgs.filterCriteria');
        this.fileList           = _.get(options, 'extraArgs.fileList');
        this.lastFileNextExit   = _.get(options, 'extraArgs.lastFileNextExit', true);

        if(this.fileList) {
            //  we'll need to adjust position as well!
            this.fileListPosition = 0;
        }

        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
                }

                if(this.lastFileNextExit) {
                    return this.prevMenu(cb);
                }

                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) => {
                [ 'detailsNfo', 'detailsFileList', 'details' ].forEach(n => {
                    const vc = this.viewControllers[n];
                    if(vc) {
                        vc.detachClientEvents();
                    }
                });

                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.uploadTimestampFormat || this.client.currentTheme.helpers.getDateFormat('short');
        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            : _.get(area, 'name') || 'N/A',
            areaDesc            : _.get(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);
            let desc;
            if(mimeType) {
                let fileType = _.get(Config(), [ 'fileTypes', mimeType ] );

                if(Array.isArray(fileType)) {
                    //  further refine by extention
                    fileType = fileType.find(ft => paths.extname(currEntry.fileName) === ft.ext);
                }
                desc = fileType && fileType.desc;
            }
            entryInfo.archiveTypeDesc = desc || mimeType || entryInfo.archiveType;
        } else {
            entryInfo.archiveTypeDesc = 'N/A';
        }

        entryInfo.uploadByUsername  = 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  = userRatingTicked.repeat(entryInfo.userRating);
        if(entryInfo.userRating < 5) {
            entryInfo.userRatingString += userRatingUnticked.repeat( (5 - entryInfo.userRating) );
        }

        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 || this.client.currentTheme.helpers.getDateTimeFormat('short');

                entryInfo.webDlLink     = ansi.vtxHyperlink(this.client, serveItem.url) + 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 populateDesc(callback) {
                    if(_.isString(self.currentFileEntry.desc)) {
                        const descView = self.viewControllers.browse.getView(MciViewIds.browse.desc);
                        if(descView) {
                            //
                            //  For descriptions we want to support as many color code systems
                            //  as we can for coverage of what is found in the while (e.g. Renegade
                            //  pipes, PCB @X##, etc.)
                            //
                            //  MLTEV doesn't support all of this, so convert. If we produced ANSI
                            //  esc sequences, we'll proceed with specialization, else just treat
                            //  it as text.
                            //
                            const desc = controlCodesToAnsi(self.currentFileEntry.desc);
                            if(desc.length != self.currentFileEntry.desc.length || isAnsi(desc)) {
                                descView.setAnsi(
                                    desc,
                                    {
                                        prepped         : false,
                                        forceLineTerm   : true
                                    },
                                    () => {
                                        return callback(null);
                                    }
                                );
                            } else {
                                descView.setText(self.currentFileEntry.desc);
                                return callback(null);
                            }
                        }
                    } else {
                        return callback(null);
                    }
                },
                function populateAdditionalViews(callback) {
                    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   = ansi.vtxHyperlink(self.client, url) + 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);
            }

            //  assign and add standard "text" member for itemFormat
            this.currentFileEntry.archiveEntries = entries.map(e => Object.assign(e, { text : `${e.fileName} (${e.byteSize})` } ));
            return cb(null, 're-cached');
        });
    }

    setFileListNoListing(text) {
        const fileListView = this.viewControllers.detailsFileList.getView(MciViewIds.detailsFileList.fileList);
        if(fileListView) {
            fileListView.complexItems = false;
            fileListView.setItems( [ text ] );
            fileListView.redraw();
        }
    }

    populateFileListing() {
        const fileListView = this.viewControllers.detailsFileList.getView(MciViewIds.detailsFileList.fileList);

        if(this.currentFileEntry.entryInfo.archiveType) {
            this.cacheArchiveEntries( (err, cacheStatus) => {
                if(err) {
                    return this.setFileListNoListing('Failed to get file listing');
                }

                if('re-cached' === cacheStatus) {
                    fileListView.setItems(this.currentFileEntry.archiveEntries);
                    fileListView.redraw();
                }
            });
        } else {
            const notAnArchiveFileName = stringFormat(this.menuConfig.config.notAnArchiveFormat || 'Not an archive', { fileName : this.currentFileEntry.fileName } );
            this.setFileListNoListing(notAnArchiveFileName);
        }
    }

    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) {
                                    return callback(null);
                                }

                                if(isAnsi(self.currentFileEntry.entryInfo.descLong)) {
                                    nfoView.setAnsi(
                                        self.currentFileEntry.entryInfo.descLong,
                                        {
                                            prepped         : false,
                                            forceLineTerm   : true,
                                        },
                                        () => {
                                            return callback(null);
                                        }
                                    );
                                } else {
                                    nfoView.setText(self.currentFileEntry.entryInfo.descLong);
                                    return callback(null);
                                }
                            }
                            break;

                        case 'fileList' :
                            self.populateFileListing();
                            return callback(null);

                        default :
                            return callback(null);
                    }
                },
                function setLabels(callback) {
                    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;

            const filterCriteria = Object.assign({}, this.filterCriteria);
            if(!filterCriteria.areaTag) {
                filterCriteria.areaTag = FileArea.getAvailableFileAreaTags(this.client);
            }

            FileEntry.findFiles(filterCriteria, (err, fileIds) => {
                this.fileList = fileIds;
                return cb(err);
            });
        }
    }
};