const Component = require(`${appPath}/core/component`);
const reportHeader = new Component('report-header');
const reportFooter = new Component('report-footer');
const db = require(`${appPath}/core/database`);

module.exports = {
    name: 'extra-community',
    async serverPrefetch() {
        this.filters = this.$options.filters;
        const args = {
            landedFrom: this.landedStart,
            landedTo: this.landedEnd,
            shippedFrom: this.shippedStart,
            shippedTo: this.shippedEnd,
            continent: this.continent
        };

        const connection = await db.pool.getConnection();

        await this.fetchTravels(args, connection);

        const travels = await this.rawSql(`
            SELECT * FROM tmp.travel`, connection);
        const entries = await this.fetchEntries(connection);

        await this.rawSql(`
            DROP TEMPORARY TABLE 
                tmp.travel`, connection);

        await connection.release();

        const map = new Map();

        for (let travel of travels)
            map.set(travel.id, travel);

        for (let entry of entries) {
            const travel = map.get(entry.travelFk);
            if (!travel.entries) travel.entries = [];
            travel.entries.push(entry);
        }

        this.travels = travels;

        if (!this.travels)
            throw new Error('Something went wrong');
    },
    computed: {
        dated: function() {
            return this.filters.date(new Date(), '%d-%m-%Y');
        },
        landedStart: function() {
            if (!this.landedFrom) return;

            return this.filters.date(this.landedFrom, '%Y-%m-%d');
        },
        landedEnd: function() {
            if (!this.landedTo) return;

            return this.filters.date(this.landedTo, '%Y-%m-%d');
        },
        shippedStart: function() {
            if (!this.shippedFrom) return;

            return this.filters.date(this.shippedFrom, '%Y-%m-%d');
        },
        shippedEnd: function() {
            if (!this.shippedTo) return;

            return this.filters.date(this.shippedTo, '%Y-%m-%d');
        }
    },
    methods: {
        fetchTravels(args, connection) {
            const where = db.buildWhere(args, (key, value) => {
                switch (key) {
                case 'shippedFrom':
                    return `t.shipped >= ${value}`;
                case 'shippedTo':
                    return `t.shipped <= ${value}`;
                case 'landedFrom':
                    return `t.landed >= ${value}`;
                case 'landedTo':
                    return `t.landed <= ${value}`;
                case 'continent':
                    return `cnt.code = ${value}`;
                }
            });

            let query = this.getSqlFromDef('travels');
            query = db.merge(query, where);
            query = db.merge(query, 'GROUP BY t.id');

            return this.rawSql(query, connection);
        },

        fetchEntries(connection) {
            let query = this.getSqlFromDef('entries');
            query = db.merge(query, 'GROUP BY e.id');

            return this.rawSql(query, connection);
        }
    },
    components: {
        'report-header': reportHeader.build(),
        'report-footer': reportFooter.build()
    },
    props: [
        'landedFrom',
        'landedTo',
        'shippedFrom',
        'shippedTo',
        'continent'
    ]
};