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

//  enigma-bbs
const MenuModule                        = require('./menu_module.js').MenuModule;
const stringFormat                      = require('./string_format.js');
const getSortedAvailableFileAreas       = require('./file_base_area.js').getSortedAvailableFileAreas;
const getAreaDefaultStorageDirectory    = require('./file_base_area.js').getAreaDefaultStorageDirectory;
const scanFile                          = require('./file_base_area.js').scanFile;
const getFileAreaByTag                  = require('./file_base_area.js').getFileAreaByTag;
const getDescFromFileName               = require('./file_base_area.js').getDescFromFileName;
const ansiGoto                          = require('./ansi_term.js').goto;
const moveFileWithCollisionHandling     = require('./file_util.js').moveFileWithCollisionHandling;
const pathWithTerminatingSeparator      = require('./file_util.js').pathWithTerminatingSeparator;
const Log                               = require('./logger.js').log;
const Errors                            = require('./enig_error.js').Errors;
const FileEntry                         = require('./file_entry.js');
const isAnsi                            = require('./string_util.js').isAnsi;
const Events                            = require('./events.js');

//  deps
const async                             = require('async');
const _                                 = require('lodash');
const temptmp                           = require('temptmp').createTrackedSession('upload');
const paths                             = require('path');
const sanatizeFilename                  = require('sanitize-filename');

exports.moduleInfo = {
    name        : 'Upload',
    desc        : 'Module for classic file uploads',
    author      : 'NuSkooler',
};

const FormIds = {
    options     : 0,
    processing  : 1,
    fileDetails : 2,
    dupes       : 3,
};

const MciViewIds = {
    options : {
        area        : 1,    //  area selection
        uploadType  : 2,    //  blind vs specify filename
        fileName    : 3,    //  for non-blind; not editable for blind
        navMenu     : 4,    //  next/cancel/etc.
        errMsg      : 5,    //  errors (e.g. filename cannot be blank)
    },

    processing : {
        calcHashIndicator       : 1,
        archiveListIndicator    : 2,
        descFileIndicator       : 3,
        logStep                 : 4,
        customRangeStart        : 10,   //  10+ = customs
    },

    fileDetails : {
        desc                : 1,    //  defaults to 'desc' (e.g. from FILE_ID.DIZ)
        tags                : 2,    //  tag(s) for item
        estYear             : 3,
        accept              : 4,    //  accept fields & continue
        customRangeStart    : 10,   //  10+ = customs
    },

    dupes : {
        dupeList            : 1,
    }
};

exports.getModule = class UploadModule extends MenuModule {

    constructor(options) {
        super(options);

        this.interrupt = MenuModule.InterruptTypes.Never;

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

        this.availAreas = getSortedAvailableFileAreas(this.client, { writeAcs : true } );

        this.menuMethods = {
            optionsNavContinue : (formData, extraArgs, cb) => {
                return this.performUpload(cb);
            },

            fileDetailsContinue : (formData, extraArgs, cb) => {
                //  see displayFileDetailsPageForUploadEntry() for this hackery:
                cb(null);
                return this.fileDetailsCurrentEntrySubmitCallback(null, formData.value);    //  move on to the next entry, if any
            },

            //  validation
            validateNonBlindFileName : (fileName, cb) => {
                if(0 === fileName.length) {
                    return cb(new Error('Filename cannot be empty'));
                }

                fileName = sanatizeFilename(fileName);  //  remove unsafe chars, path info, etc.
                if(0 === fileName.length) { //  sanatize nuked everything?
                    return cb(new Error('Invalid filename'));
                }

                //  At least SEXYZ doesn't like non-blind names that start with a number - it becomes confused ;-(
                if(/^[0-9].*$/.test(fileName)) {
                    return cb(new Error('Invalid filename'));
                }

                return cb(null);
            },
            viewValidationListener : (err, cb) => {
                const errView = this.viewControllers.options.getView(MciViewIds.options.errMsg);
                if(errView) {
                    if(err) {
                        errView.setText(err.message);
                    } else {
                        errView.clearText();
                    }
                }

                return cb(null);
            }
        };
    }

    getSaveState() {
        //  if no areas, we're falling back due to lack of access/areas avail to upload to
        if(this.availAreas.length > 0) {
            return {
                uploadType          : this.uploadType,
                tempRecvDirectory   : this.tempRecvDirectory,
                areaInfo            : this.availAreas[ this.viewControllers.options.getView(MciViewIds.options.area).getData() ],
            };
        }
    }

    restoreSavedState(savedState) {
        if(savedState.areaInfo) {
            this.uploadType         = savedState.uploadType;
            this.areaInfo           = savedState.areaInfo;
            this.tempRecvDirectory  = savedState.tempRecvDirectory;
        }
    }

    isBlindUpload() { return 'blind' === this.uploadType; }
    isFileTransferComplete() { return !_.isUndefined(this.recvFilePaths); }

    initSequence() {
        const self = this;

        if(0 === this.availAreas.length) {
            //
            return this.gotoMenu(this.menuConfig.config.noUploadAreasAvailMenu || 'fileBaseNoUploadAreasAvail');
        }

        async.series(
            [
                function before(callback) {
                    return self.beforeArt(callback);
                },
                function display(callback) {
                    if(self.isFileTransferComplete()) {
                        return self.displayProcessingPage(callback);
                    } else {
                        return self.displayOptionsPage(callback);
                    }
                }
            ],
            () => {
                return self.finishedLoading();
            }
        );
    }

    finishedLoading() {
        if(this.isFileTransferComplete()) {
            return this.processUploadedFiles();
        }
    }

    performUpload(cb) {
        temptmp.mkdir( { prefix : 'enigul-' }, (err, tempRecvDirectory) => {
            if(err) {
                return cb(err);
            }

            //  need a terminator for various external protocols
            this.tempRecvDirectory = pathWithTerminatingSeparator(tempRecvDirectory);

            const modOpts = {
                extraArgs : {
                    recvDirectory   : this.tempRecvDirectory,   //  we'll move files from here to their area container once processed/confirmed
                    direction       : 'recv',
                }
            };

            if(!this.isBlindUpload()) {
                //  data has been sanatized at this point
                modOpts.extraArgs.recvFileName = this.viewControllers.options.getView(MciViewIds.options.fileName).getData();
            }

            //
            //  Move along to protocol selection -> file transfer
            //  Upon completion, we'll re-enter the module with some file paths handed to us
            //
            return this.gotoMenu(
                this.menuConfig.config.fileTransferProtocolSelection || 'fileTransferProtocolSelection',
                modOpts,
                cb
            );
        });
    }

    continueNonBlindUpload(cb) {
        return cb(null);
    }

    updateScanStepInfoViews(stepInfo) {
        //  :TODO: add some blinking (e.g. toggle items) indicators - see OBV.DOC

        const fmtObj = Object.assign( {}, stepInfo);
        let stepIndicatorFmt = '';
        let logStepFmt;

        const fmtConfig = this.menuConfig.config;

        const indicatorStates   = fmtConfig.indicatorStates || [ '|', '/', '-', '\\' ];
        const indicatorFinished = fmtConfig.indicatorFinished || '√';

        const indicator = { };
        const self = this;

        function updateIndicator(mci, isFinished) {
            indicator.mci = mci;

            if(isFinished) {
                indicator.text = indicatorFinished;
            } else {
                self.scanStatus.indicatorPos += 1;
                if(self.scanStatus.indicatorPos >= indicatorStates.length) {
                    self.scanStatus.indicatorPos = 0;
                }
                indicator.text = indicatorStates[self.scanStatus.indicatorPos];
            }
        }

        switch(stepInfo.step) {
            case 'start' :
                logStepFmt = stepIndicatorFmt = fmtConfig.scanningStartFormat || 'Scanning {fileName}';
                break;

            case 'hash_update' :
                stepIndicatorFmt = fmtConfig.calcHashFormat || 'Calculating hash/checksums: {calcHashPercent}%';
                updateIndicator(MciViewIds.processing.calcHashIndicator);
                break;

            case 'hash_finish' :
                stepIndicatorFmt = fmtConfig.calcHashCompleteFormat || 'Finished calculating hash/checksums';
                updateIndicator(MciViewIds.processing.calcHashIndicator, true);
                break;

            case 'archive_list_start' :
                stepIndicatorFmt = fmtConfig.extractArchiveListFormat || 'Extracting archive list';
                updateIndicator(MciViewIds.processing.archiveListIndicator);
                break;

            case 'archive_list_finish' :
                fmtObj.archivedFileCount = stepInfo.archiveEntries.length;
                stepIndicatorFmt = fmtConfig.extractArchiveListFinishFormat || 'Archive list extracted ({archivedFileCount} files)';
                updateIndicator(MciViewIds.processing.archiveListIndicator, true);
                break;

            case 'archive_list_failed' :
                stepIndicatorFmt = fmtConfig.extractArchiveListFailedFormat || 'Archive list extraction failed';
                break;

            case 'desc_files_start' :
                stepIndicatorFmt = fmtConfig.processingDescFilesFormat || 'Processing description files';
                updateIndicator(MciViewIds.processing.descFileIndicator);
                break;

            case 'desc_files_finish' :
                stepIndicatorFmt = fmtConfig.processingDescFilesFinishFormat || 'Finished processing description files';
                updateIndicator(MciViewIds.processing.descFileIndicator, true);
                break;

            case 'finished' :
                logStepFmt = stepIndicatorFmt = fmtConfig.scanningStartFormat || 'Finished';
                break;
        }

        fmtObj.stepIndicatorText = stringFormat(stepIndicatorFmt, fmtObj);

        if(this.hasProcessingArt) {
            this.updateCustomViewTextsWithFilter('processing', MciViewIds.processing.customRangeStart, fmtObj, { appendMultiLine : true } );

            if(indicator.mci && indicator.text) {
                this.setViewText('processing', indicator.mci, indicator.text);
            }

            if(logStepFmt) {
                this.setViewText('processing', MciViewIds.processing.logStep, stringFormat(logStepFmt, fmtObj),  { appendMultiLine : true } );
            }
        } else {
            this.client.term.pipeWrite(fmtObj.stepIndicatorText);
        }
    }

    scanFiles(cb) {
        const self = this;

        const results = {
            newEntries  : [],
            dupes       : [],
        };

        self.client.log.debug('Scanning upload(s)', { paths : this.recvFilePaths } );

        let currentFileNum = 0;

        async.eachSeries(this.recvFilePaths, (filePath, nextFilePath) => {
            //  :TODO: virus scanning/etc. should occur around here

            currentFileNum += 1;

            self.scanStatus = {
                indicatorPos    : 0,
            };

            const scanOpts = {
                areaTag     : self.areaInfo.areaTag,
                storageTag  : self.areaInfo.storageTags[0],
                hashTags    : self.areaInfo.hashTags,
            };

            function handleScanStep(stepInfo, nextScanStep) {
                stepInfo.totalFileNum       = self.recvFilePaths.length;
                stepInfo.currentFileNum     = currentFileNum;

                self.updateScanStepInfoViews(stepInfo);
                return nextScanStep(null);
            }

            self.client.log.debug('Scanning file', { filePath : filePath } );

            scanFile(filePath, scanOpts, handleScanStep, (err, fileEntry, dupeEntries) => {
                if(err) {
                    return nextFilePath(err);
                }

                //  new or dupe?
                if(dupeEntries.length > 0) {
                    //  1:n dupes found
                    self.client.log.debug('Duplicate file(s) found', { dupeEntries : dupeEntries } );

                    results.dupes = results.dupes.concat(dupeEntries);
                } else {
                    //  new one
                    results.newEntries.push(fileEntry);
                }

                return nextFilePath(null);
            });
        }, err => {
            return cb(err, results);
        });
    }

    cleanupTempFiles() {
        temptmp.cleanup( paths => {
            Log.debug( { paths : paths, sessionId : temptmp.sessionId }, 'Temporary files cleaned up' );
        });
    }

    moveAndPersistUploadsToDatabase(newEntries) {

        const areaStorageDir = getAreaDefaultStorageDirectory(this.areaInfo);
        const self = this;

        async.eachSeries(newEntries, (newEntry, nextEntry) => {
            const src   = paths.join(self.tempRecvDirectory, newEntry.fileName);
            const dst   = paths.join(areaStorageDir, newEntry.fileName);

            moveFileWithCollisionHandling(src, dst, (err, finalPath) => {
                if(err) {
                    self.client.log.error(
                        'Failed moving physical upload file', { error : err.message, fileName : newEntry.fileName, source : src, dest : dst }
                    );
                    return nextEntry(null); //  still try next file
                } else if(dst !== finalPath)
                {
                    //  name changed; adjust before persist
                    newEntry.fileName = paths.basename(finalPath);
                }

                self.client.log.debug('Moved upload to area', { path : finalPath } );

                //  persist to DB
                newEntry.persist(err => {
                    if(err) {
                        self.client.log.error('Failed persisting upload to database', { path : finalPath, error : err.message } );
                    }

                    return nextEntry(null); //  still try next file
                });
            });
        }, () => {
            //
            //  Finally, we can remove any temp files that we may have created
            //
            self.cleanupTempFiles();
        });
    }

    prepDetailsForUpload(scanResults, cb) {
        async.eachSeries(scanResults.newEntries, (newEntry, nextEntry) => {
            newEntry.meta.upload_by_username    = this.client.user.username;
            newEntry.meta.upload_by_user_id     = this.client.user.userId;

            this.displayFileDetailsPageForUploadEntry(newEntry, (err, newValues) => {
                if(err) {
                    return nextEntry(err);
                }

                if(!newEntry.descIsAnsi) {
                    newEntry.desc = _.trimEnd(newValues.shortDesc);
                }

                if(newValues.estYear.length > 0) {
                    newEntry.meta.est_release_year = newValues.estYear;
                }

                if(newValues.tags.length > 0) {
                    newEntry.setHashTags(newValues.tags);
                }

                return nextEntry(err);
            });
        }, err => {
            delete this.fileDetailsCurrentEntrySubmitCallback;
            return cb(err, scanResults);
        });
    }

    displayDupesPage(dupes, cb) {
        //
        //  If we have custom art to show, use it - else just dump basic info.
        //  Pause at the end in either case.
        //
        const self = this;

        async.waterfall(
            [
                function prepArtAndViewController(callback) {
                    self.prepViewControllerWithArt(
                        'dupes',
                        FormIds.dupes,
                        { clearScreen : true, trailingLF : false },
                        err => {
                            if(err) {
                                self.client.term.pipeWrite('|00|07Duplicate upload(s) found:\n');
                                return callback(null, null);
                            }

                            const dupeListView = self.viewControllers.dupes.getView(MciViewIds.dupes.dupeList);
                            return callback(null, dupeListView);
                        }
                    );
                },
                function prepDupeObjects(dupeListView, callback) {
                    //  update dupe objects with additional info that can be used for formatString() and the like
                    async.each(dupes, (dupe, nextDupe) => {
                        FileEntry.loadBasicEntry(dupe.fileId, dupe, err => {
                            if(err) {
                                return nextDupe(err);
                            }

                            const areaInfo = getFileAreaByTag(dupe.areaTag);
                            if(areaInfo) {
                                dupe.areaName   = areaInfo.name;
                                dupe.areaDesc   = areaInfo.desc;
                            }
                            return nextDupe(null);
                        });
                    }, err => {
                        return callback(err, dupeListView);
                    });
                },
                function populateDupeInfo(dupeListView, callback) {
                    const dupeInfoFormat = self.menuConfig.config.dupeInfoFormat || '{fileName} @ {areaName}';

                    if(dupeListView) {
                        dupeListView.setItems(dupes.map(dupe => stringFormat(dupeInfoFormat, dupe) ) );
                        dupeListView.redraw();
                    } else {
                        dupes.forEach(dupe => {
                            self.client.term.pipeWrite(`${stringFormat(dupeInfoFormat, dupe)}\n`);
                        });
                    }

                    return callback(null);
                },
                function pause(callback) {
                    return self.pausePrompt( { row : self.client.term.termHeight }, callback);
                }
            ],
            err => {
                return cb(err);
            }
        );
    }

    processUploadedFiles() {
        //
        //  For each file uploaded, we need to process & gather information
        //
        const self = this;

        async.waterfall(
            [
                function prepNonBlind(callback) {
                    if(self.isBlindUpload()) {
                        return callback(null);
                    }

                    //
                    //  For non-blind uploads, batch is not supported, we expect a single file
                    //  in |recvFilePaths|. If not, it's an error (we don't want to process the wrong thing)
                    //
                    if(self.recvFilePaths.length > 1) {
                        self.client.log.warn( { recvFilePaths : self.recvFilePaths }, 'Non-blind upload received 2:n files' );
                        return callback(Errors.UnexpectedState(`Non-blind upload expected single file but got received ${self.recvFilePaths.length}`));
                    }

                    return callback(null);
                },
                function scan(callback) {
                    return self.scanFiles(callback);
                },
                function pause(scanResults, callback) {
                    if(self.hasProcessingArt) {
                        self.client.term.rawWrite(ansiGoto(self.client.term.termHeight, 1));
                    } else {
                        self.client.term.write('\n');
                    }

                    self.pausePrompt( () => {
                        return callback(null, scanResults);
                    });
                },
                function displayDupes(scanResults, callback) {
                    if(0 === scanResults.dupes.length) {
                        return callback(null, scanResults);
                    }

                    return self.displayDupesPage(scanResults.dupes, () => {
                        return callback(null, scanResults);
                    });
                },
                function prepDetails(scanResults, callback) {
                    return self.prepDetailsForUpload(scanResults, callback);
                },
                function startMovingAndPersistingToDatabase(scanResults, callback) {
                    //
                    //  *Start* the process of moving files from their current |tempRecvDirectory|
                    //  locations -> their final area destinations. Don't make the user wait
                    //  here as I/O can take quite a bit of time. Log any failures.
                    //
                    self.moveAndPersistUploadsToDatabase(scanResults.newEntries);
                    return callback(null, scanResults.newEntries);
                },
                function sendEvent(uploadedEntries, callback) {
                    Events.emit(
                        Events.getSystemEvents().UserUpload,
                        {
                            user    : self.client.user,
                            files   : uploadedEntries,
                        }
                    );
                    return callback(null);
                }
            ],
            err => {
                if(err) {
                    self.client.log.warn('File upload error encountered', { error : err.message } );
                    self.cleanupTempFiles();    //  normally called after moveAndPersistUploadsToDatabase() is completed.
                }

                return self.prevMenu();
            }
        );
    }

    displayOptionsPage(cb) {
        const self = this;

        async.series(
            [
                function prepArtAndViewController(callback) {
                    return self.prepViewControllerWithArt(
                        'options',
                        FormIds.options,
                        { clearScreen : true, trailingLF : false },
                        callback
                    );
                },
                function populateViews(callback) {
                    const areaSelectView = self.viewControllers.options.getView(MciViewIds.options.area);
                    areaSelectView.setItems( self.availAreas.map(areaInfo => areaInfo.name ) );

                    const uploadTypeView    = self.viewControllers.options.getView(MciViewIds.options.uploadType);
                    const fileNameView      = self.viewControllers.options.getView(MciViewIds.options.fileName);

                    const blindFileNameText = self.menuConfig.config.blindFileNameText || '(blind - filename ignored)';

                    uploadTypeView.on('index update', idx => {
                        self.uploadType = (0 === idx) ? 'blind' : 'non-blind';

                        if(self.isBlindUpload()) {
                            fileNameView.setText(blindFileNameText);
                            fileNameView.acceptsFocus = false;
                        } else  {
                            fileNameView.clearText();
                            fileNameView.acceptsFocus = true;
                        }
                    });

                    //  sanatize filename for display when leaving the view
                    self.viewControllers.options.on('leave', prevView => {
                        if(prevView.id === MciViewIds.options.fileName) {
                            fileNameView.setText(sanatizeFilename(fileNameView.getData()));
                        }
                    });

                    self.uploadType = 'blind';
                    uploadTypeView.setFocusItemIndex(0);    //  default to blind
                    fileNameView.setText(blindFileNameText);
                    areaSelectView.redraw();

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

    displayProcessingPage(cb) {
        return this.prepViewControllerWithArt(
            'processing',
            FormIds.processing,
            { clearScreen : true, trailingLF : false },
            err => {
                //  note: this art is not required
                this.hasProcessingArt = !err;

                return cb(null);
            }
        );
    }

    fileEntryHasDetectedDesc(fileEntry) {
        return (fileEntry.desc && fileEntry.desc.length > 0);
    }

    displayFileDetailsPageForUploadEntry(fileEntry, cb) {
        const self = this;

        async.waterfall(
            [
                function prepArtAndViewController(callback) {
                    return self.prepViewControllerWithArt(
                        'fileDetails',
                        FormIds.fileDetails,
                        { clearScreen : true, trailingLF : false },
                        err => {
                            return callback(err);
                        }
                    );
                },
                function populateViews(callback) {
                    const descView = self.viewControllers.fileDetails.getView(MciViewIds.fileDetails.desc);
                    const tagsView = self.viewControllers.fileDetails.getView(MciViewIds.fileDetails.tags);
                    const yearView = self.viewControllers.fileDetails.getView(MciViewIds.fileDetails.estYear);

                    self.updateCustomViewTextsWithFilter('fileDetails', MciViewIds.fileDetails.customRangeStart, fileEntry );

                    tagsView.setText( Array.from(fileEntry.hashTags).join(',') );   //  :TODO: optional 'hashTagsSep' like file list/browse
                    yearView.setText(fileEntry.meta.est_release_year || '');

                    if(isAnsi(fileEntry.desc)) {
                        fileEntry.descIsAnsi = true;

                        return descView.setAnsi(
                            fileEntry.desc,
                            {
                                prepped         : false,
                                forceLineTerm   : true,
                            },
                            () => {
                                return callback(null, descView, 'preview', MciViewIds.fileDetails.tags);
                            }
                        );
                    } else {
                        const hasDesc = self.fileEntryHasDetectedDesc(fileEntry);
                        descView.setText(
                            hasDesc ? fileEntry.desc : getDescFromFileName(fileEntry.fileName),
                            { scrollMode : 'top' }  //  override scroll mode; we want to be @ top
                        );
                        return callback(null, descView, 'edit', hasDesc ? MciViewIds.fileDetails.tags : MciViewIds.fileDetails.desc);
                    }
                },
                function finalizeViews(descView, descViewMode, focusId, callback) {
                    descView.setPropertyValue('mode', descViewMode);
                    descView.acceptsFocus   = 'preview' === descViewMode ? false : true;
                    self.viewControllers.fileDetails.switchFocus(focusId);
                    return callback(null);
                }
            ],
            err => {
                //
                //  we only call |cb| here if there is an error
                //  else, wait for the current from to be submit - then call -
                //  this way we'll move on to the next file entry when ready
                //
                if(err) {
                    return cb(err);
                }

                self.fileDetailsCurrentEntrySubmitCallback = cb;    //  stash for moduleMethods.fileDetailsContinue
            }
        );
    }
};