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

//  ENiGMA½
const MenuModule                    = require('./menu_module.js').MenuModule;
const ViewController                = require('./view_controller.js').ViewController;
const Errors                        = require('./enig_error.js').Errors;
const FileEntry                     = require('./file_entry.js');
const FileBaseFilters               = require('./file_base_filter.js');
const { getAvailableFileAreaTags }  = require('./file_base_area.js');
const {
    getSortedAvailMessageConferences,
    getSortedAvailMessageAreasByConfTag,
    updateMessageAreaLastReadId,
    getMessageIdNewerThanTimestampByArea
}                                   = require('./message_area.js');
const stringFormat                  = require('./string_format.js');

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

exports.moduleInfo = {
    name    : 'Set New Scan Date',
    desc    : 'Sets new scan date for applicable scans',
    author  : 'NuSkooler',
};

const MciViewIds = {
    main : {
        scanDate        : 1,
        targetSelection : 2,
    }
};

//  :TODO: for messages, we could insert "conf - all areas" into targets, and allow such

exports.getModule = class SetNewScanDate extends MenuModule {
    constructor(options) {
        super(options);

        const config = this.menuConfig.config;

        this.target         = config.target || 'message';
        this.scanDateFormat = config.scanDateFormat || 'YYYYMMDD';

        this.menuMethods = {
            scanDateSubmit : (formData, extraArgs, cb) => {
                let scanDate = _.get(formData, 'value.scanDate');
                if(!scanDate) {
                    return cb(Errors.MissingParam('"scanDate" missing from form data'));
                }

                scanDate = moment(scanDate, this.scanDateFormat);
                if(!scanDate.isValid()) {
                    return cb(Errors.Invalid(`"${_.get(formData, 'value.scanDate')}" is not a valid date`));
                }

                const targetSelection = _.get(formData, 'value.targetSelection');   //  may be undefined if N/A

                this[`setNewScanDateFor${_.capitalize(this.target)}Base`](targetSelection, scanDate, () => {
                    return this.prevMenu(cb);
                });
            },
        };
    }

    setNewScanDateForMessageBase(targetSelection, scanDate, cb) {
        const target = this.targetSelections[targetSelection];
        if(!target) {
            return cb(Errors.UnexpectedState('Unable to get target in which to set new scan'));
        }

        //  selected area, or all of 'em
        let updateAreaTags;
        if('' === target.area.areaTag) {
            updateAreaTags = this.targetSelections
                .map( targetSelection => targetSelection.area.areaTag )
                .filter( areaTag => areaTag );  //  remove the blank 'all' entry
        } else {
            updateAreaTags = [ target.area.areaTag ];
        }

        async.each(updateAreaTags, (areaTag, nextAreaTag) => {
            getMessageIdNewerThanTimestampByArea(areaTag, scanDate, (err, messageId) => {
                if(err) {
                    return nextAreaTag(err);
                }

                if(!messageId) {
                    return nextAreaTag(null);   //  nothing to do
                }

                messageId = Math.max(messageId - 1, 0);

                return updateMessageAreaLastReadId(
                    this.client.user.userId,
                    areaTag,
                    messageId,
                    true,   //  allowOlder
                    nextAreaTag
                );
            });
        }, err => {
            return cb(err);
        });
    }

    setNewScanDateForFileBase(targetSelection, scanDate, cb) {
        //
        //  ENiGMA doesn't currently have the concept of per-area
        //  scan pointers for users, so we use all areas avail
        //  to the user.
        //
        const filterCriteria = {
            areaTag             : getAvailableFileAreaTags(this.client),
            newerThanTimestamp  : scanDate,
            limit               : 1,
            orderBy             : 'upload_timestamp',
            order               : 'ascending',
        };

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

            if(!fileIds || 0 === fileIds.length) {
                //  nothing to do
                return cb(null);
            }

            const pointerFileId = Math.max(fileIds[0] - 1, 0);

            return FileBaseFilters.setFileBaseLastViewedFileIdForUser(
                this.client.user,
                pointerFileId,
                true,   //  allowOlder
                cb
            );
        });
    }

    loadAvailMessageBaseSelections(cb) {
        //
        //  Create an array of objects with conf/area information per entry,
        //  sorted naturally or via the 'sort' member in config
        //
        const selections = [];
        getSortedAvailMessageConferences(this.client).forEach(conf => {
            getSortedAvailMessageAreasByConfTag(conf.confTag, { client : this.client } ).forEach(area => {
                selections.push({
                    conf    : {
                        confTag : conf.confTag,
                        text    : conf.conf.name,   //  standard
                        name    : conf.conf.name,
                        desc    : conf.conf.desc,
                    },
                    area    : {
                        areaTag : area.areaTag,
                        text    : area.area.name,   //  standard
                        name    : area.area.name,
                        desc    : area.area.desc,
                    }
                });
            });
        });

        selections.unshift({
            conf : {
                confTag : '',
                text    : 'All conferences',
                name    : 'All conferences',
                desc    : 'All conferences',
            },
            area    : {
                areaTag : '',
                text    : 'All areas',
                name    : 'All areas',
                desc    : 'All areas',
            }
        });

        //  Find current conf/area & move it directly under "All"
        const currConfTag   = this.client.user.properties.message_conf_tag;
        const currAreaTag   = this.client.user.properties.message_area_tag;
        if(currConfTag && currAreaTag) {
            const confAreaIndex = selections.findIndex( confArea => {
                return confArea.conf.confTag === currConfTag && confArea.area.areaTag === currAreaTag;
            });

            if(confAreaIndex > -1) {
                selections.splice(1, 0, selections.splice(confAreaIndex, 1)[0]);
            }
        }

        this.targetSelections = selections;

        return cb(null);
    }

    mciReady(mciData, cb) {
        super.mciReady(mciData, err => {
            if(err) {
                return cb(err);
            }

            const self  = this;
            const vc    = self.addViewController( 'main', new ViewController( { client : this.client } ) );

            async.series(
                [
                    function validateConfig(callback) {
                        if(![ 'message', 'file' ].includes(self.target)) {
                            return callback(Errors.Invalid(`Invalid "target" in config: ${self.target}`));
                        }
                        //  :TOD0: validate scanDateFormat
                        return callback(null);
                    },
                    function loadFromConfig(callback) {
                        return vc.loadFromMenuConfig( { callingMenu : self, mciMap : mciData.menu }, callback);
                    },
                    function loadAvailSelections(callback) {
                        switch(self.target) {
                            case 'message' :
                                return self.loadAvailMessageBaseSelections(callback);

                            default :
                                return callback(null);
                        }
                    },
                    function populateForm(callback) {
                        const today = moment();

                        const scanDateView = vc.getView(MciViewIds.main.scanDate);

                        //  :TODO: MaskTextEditView needs some love: If setText() with input that matches the mask, we should ignore the non-mask chars! Hack in place for now
                        const scanDateFormat = self.scanDateFormat.replace(/[/\-. ]/g, '');
                        scanDateView.setText(today.format(scanDateFormat));

                        if('message' === self.target) {
                            const targetSelectionView = vc.getView(MciViewIds.main.targetSelection);

                            targetSelectionView.setItems(self.targetSelections);
                            targetSelectionView.setFocusItemIndex(0);
                        }

                        self.viewControllers.main.resetInitialFocus();
                        //vc.switchFocus(MciViewIds.main.scanDate);
                        return callback(null);
                    }
                ],
                err => {
                    return cb(err);
                }
            );
        });
    }
};