const express = require('express');

const classroomCountApp = express.Router();

const libs = `${process.cwd()}/libs`;

const squel = require('squel');

const query = require(`${libs}/middlewares/query`).query;

const response = require(`${libs}/middlewares/response`);

const ReqQueryFields = require(`${libs}/middlewares/reqQueryFields`);

const id2str = require(`${libs}/middlewares/id2str`);

const addMissing = require(`${libs}/middlewares/addMissing`);

const config = require(`${libs}/config`); 

const cache = require('apicache').options({ debug: config.debug, statusCodes: {include: [200]} }).middleware;

let rqf = new ReqQueryFields();

rqf.addField({
    name: 'filter',
    field: false,
    where: true
}).addField({
    name: 'dims',
    field: true,
    where: false
}).addValueToField({
    name: 'city',
    table: 'municipio',
    tableField: 'nome',
    resultField: 'city_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'municipio_id',
        table: '@'
    },
    join: {
        primary: 'id',
        foreign: 'municipio_id',
        foreignTable: '@'
    }
}, 'filter').addValueToField({
    name: 'city',
    table: 'municipio',
    tableField: ['nome', 'id'],
    resultField: ['city_name', 'city_id'],
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'municipio_id',
        foreignTable: '@'
    }
}, 'dims').addValueToField({
    name: 'state',
    table: 'estado',
    tableField: 'nome',
    resultField: 'state_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'estado_id',
        table: '@'
    },
    join: {
        primary: 'id',
        foreign: 'estado_id',
        foreignTable: '@'
    }
}, 'filter').addValueToField({
    name: 'state',
    table: 'estado',
    tableField: ['nome', 'id'],
    resultField: ['state_name', 'state_id'],
    where: {
        relation: '=',
        type: 'integer',
        field: 'id',
    },
    join: {
        primary: 'id',
        foreign: 'estado_id',
        foreignTable: '@'
    }
}, 'dims').addValue({
    name: 'region',
    table: 'regiao',
    tableField: 'nome',
    resultField: 'region_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'regiao_id',
        foreignTable: '@'
    }
}).addValue({
    name: 'min_year',
    table: '@',
    tableField: 'ano_censo',
    resultField: 'year',
    where: {
        relation: '>=',
        type: 'integer',
        field: 'ano_censo'
    }
}).addValue({
    name: 'max_year',
    table: '@',
    tableField: 'ano_censo',
    resultField: 'year',
    where: {
        relation: '<=',
        type: 'integer',
        field: 'ano_censo'
    }
}).addValue({
    name: 'period',
    table: '@',
    tableField: 'turma_turno_id',
    resultField: 'period_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'turma_turno_id'
    }
}).addValue({
    name: 'school_year',
    table: '@',
    tableField: 'serie_ano_id',
    resultField: 'school_year_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'serie_ano_id'
    }
}).addValue({
    name: 'location',
    table: '@',
    tableField: 'localizacao_id',
    resultField: 'location_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'localizacao_id'
    }
}).addValue({
    name: 'education_level_short',
    table: '@',
    tableField: 'etapa_resumida',
    resultField: 'education_level_short_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'etapa_resumida'
    }
});

classroomCountApp.post('/', rqf.parse(), (req, res, next) => {
    req.dims.state = true;
    req.dims.city = true;
    req.dims.period = true;
    req.dims.education_level_short = true;
    req.dims.location = true;

    req.sql.field('COUNT(*)', 'total')
    .field("'Brasil'", 'name')
    .field('matricula.ano_censo', 'year')
    .from('matricula')
    .group('matricula.ano_censo')
    .order('matricula.ano_censo')
    .where('matricula.tipo<=3');

    next();
}, rqf.build(), query, id2str.transform(), (req, res, next) => {
    req.enrollment = req.result;
    req.resetSql();
    next();
}, rqf.parse(), (req, res, next) => {

    req.dims.state = true;
    req.dims.city = true;
    req.dims.location = true;

    req.sql.field('SUM(escola.num_salas)', 'total')
    .field("'Brasil'", 'name')
    .field('escola.ano_censo', 'year')
    .from('escola')
    .group('escola.ano_censo')
    .order('escola.ano_censo')
    .where('escola.situacao_de_funcionamento = 1 AND escola.local_func_predio_escolar = 1');

    next();
}, rqf.build(), query, id2str.transform(), (req, res, next) => {
    let classSize = JSON.parse(req.body.class_size) || null;
    let integralTime = JSON.parse(req.body.integral_time) || null;

    console.log(classSize, integralTime);

    if(classSize == null || integralTime == null) {
        res.statusCode = 400;
        return res.json({err: {message: "There was an error processing class_size or integral_time. Check your JSON sintax and be sure you're sending both parameters."}});
    }

    req.classroom = req.result;
    let classroom = [];

    req.classroom.forEach((c) => {
        let cityObjects = req.classroom.filter((value) => {
            return (c.city_id == value.city_id && c.year == value.year);
        });

        let obj = {
            state_id: c.state_id,
            state_name: c.state_name,
            city_id: c.city_id,
            city_name: c.city_name,
            year: c.year,
            locations: []
        };

        cityObjects.forEach((co) => {
            obj.locations.push({
                location_id: co.location_id,
                location_name: co.location_name,
                total_classroom: co.total
            });
        });

        if(classroom.findIndex((el) => {return (el.city_id === obj.city_id && el.year === obj.year)}) === -1) {
            classroom.push(obj);
        }
    });

    let result = [];
    // Para cada resultado
    classroom.forEach((c) => {
        let r = c;
        // Para cada localização
        c.locations.forEach((location, index) => {
            function filterEnrollment(e) {
                return (e.city_id == c.city_id && e.year == c.year && e.location_id == location.location_id);
            }

            let fEnrollments = req.enrollment.filter(filterEnrollment);
            let educationLevels = [];
            fEnrollments.forEach((fe) => {
                let obj = {education_level_short_id: fe.education_level_short_id, education_level_short_name: fe.education_level_short_name};

                if(educationLevels.findIndex((el) => {return el.education_level_short_id === obj.education_level_short_id}) === -1 ) {
                    educationLevels.push(obj);
                }
            });

            let education_level = [];
            // Para cada etapa de ensino
            educationLevels.forEach((eduLevel) => {
                function filterEducationLevel(e) {
                    return (e.city_id == c.city_id && e.year == c.year && e.location_id == location.location_id && e.education_level_short_id == eduLevel.education_level_short_id);
                }

                let fEducationLevel = fEnrollments.filter(filterEducationLevel);

                let dayEnrollments = 0;
                let nightEnrollments = 0;
                // Para cada matrícula na etapa de ensino
                fEducationLevel.forEach((fEduLevel) => {
                    if(fEduLevel.period_id < 3) dayEnrollments+= fEduLevel.total;
                    else if(fEduLevel.period_id === 3) nightEnrollments+= fEduLevel.total;
                });

                let size = classSize.find((el) => {
                    return el.id === eduLevel.education_level_short_id;
                }) || undefined;
                let fullPeriodTime = integralTime.find((el) => {
                    return el.id === eduLevel.education_level_short_id;
                }) || undefined;

                if(typeof size === 'undefined' || typeof fullPeriodTime === 'undefined') return;
                size = size.numberStudentClass;
                fullPeriodTime = fullPeriodTime.offerGoal;

                let fullPeriodClasses = Math.ceil((dayEnrollments * (fullPeriodTime / 100))/size);
                let dayClasses = Math.ceil((dayEnrollments/size) - fullPeriodClasses);
                let nightClasses = Math.ceil(nightEnrollments/size);
                let totalClassroomsNeeded = fullPeriodClasses + dayClasses;

                if(nightClasses > dayClasses) totalClassroomsNeeded+= (nightClasses - dayClasses);

                let obj = {
                    total_enrollment_day : dayEnrollments,
                    total_enrollment_night: nightEnrollments,
                    full_period_classes: fullPeriodClasses,
                    day_classes: dayClasses,
                    night_classes: nightClasses,
                    total_classrooms_needed: totalClassroomsNeeded
                };

                let educationLevelIndex = education_level.findIndex((el) => {return el.education_level_short_id === eduLevel.education_level_short_id});

                if(educationLevelIndex === -1) {
                    educationLevelIndex = education_level.length;
                    education_level.push(eduLevel);
                }

                education_level[educationLevelIndex].enrollment = obj;
                // education_level[educationLevelIndex].enrollments = fEducationLevel;
            });

            r.locations[index].education_level = education_level;
        });

        result.push(r);
    });
    console.log('FEITO');
    req.result = result;
    next();
}, response('classroom_count'));

module.exports = classroomCountApp;