const express = require('express');

const enrollmentApp = express.Router();

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

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

const squel = require('squel');

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

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

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

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

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

const request = require(`request`);

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

enrollmentApp.use(cache('15 day'));

let rqf = new ReqQueryFields();

// Complete range of the enrollments dataset.
// Returns a tuple of start and ending years of the complete enrollments dataset.
enrollmentApp.get('/year_range', (req, res, next) => {
    req.sql.from('matricula')
    .field('MIN(matricula.ano_censo)', 'start_year')
    .field('MAX(matricula.ano_censo)', 'end_year')
    .where('matricula.ano_censo > 2014');
    next();
}, query, response('range'));

enrollmentApp.get('/years', (req, res, next) => {
    req.sql.from('matricula')
    .field('DISTINCT matricula.ano_censo', 'year')
    .where('matricula.ano_censo > 2014');
    next();
}, query, response('years'));

enrollmentApp.get('/source', (req, res, next) => {
    req.sql.from('fonte')
    .field('fonte', 'source')
    .where('tabela = \'matricula\'');
    next();
}, query, response('source'));

enrollmentApp.get('/location', (req, res, next) => {
    req.sql = squel.select()
    .field('id')
    .field('descricao', 'name')
    .from('localizacao')
    .where('localizacao.id <= 2');
    next();
}, query, response('location'));

enrollmentApp.get('/rural_location', (req, res, next) => {
    req.result = [
        {id: 1, name: "Urbana"},
        {id: 2, name: "Rural"},
        {id: 3, name: "Rural - Área de assentamento"},
        {id: 4, name: "Rural - Terra indígena"},
        {id: 5, name: "Rural - Área remanescente de quilombos"},
        {id: 6, name: "Rural - Unidade de uso sustentável"}
    ];
    next();
}, response('rural_location'));

// Returns all school years available
enrollmentApp.get('/school_year', (req, res, next) => {
    req.result = [];
    for(let i = 11; i <= 71; ++i) {
        let obj = {
            id: i,
            name: id2str.schoolYear(i)
        };

        if(obj.name !== id2str.schoolYear(99)) {
            req.result.push(obj);
        }
    }
    req.result.push({
        id: 99,
        name: id2str.schoolYear(99)
    });
    next();
}, response('school_year'));

// Returns all school years available
enrollmentApp.get('/education_level', (req, res, next) => {
    req.result = [];
    for(let i = 1; i <= 74; ++i) {
        let obj = {
            id: i,
            name: id2str.educationLevel(i)
        };

        if(obj.name !== id2str.educationLevel(99)) {
            req.result.push(obj);
        }
    }
    req.result.push({
        id: 99,
        name: id2str.educationLevel(99)
    });
    next();
}, response('education_level'));

// Returns all school years available
enrollmentApp.get('/education_level_mod', (req, res, next) => {
    req.result = [];
    for(let i = 1; i <= 11; ++i) {
        req.result.push({
            id: i,
            name: id2str.educationLevelMod(i)
        });
    }
    req.result.push({
        id: 99,
        name: id2str.educationLevelMod(99)
    });
    next();
}, response('education_level_mod'));

enrollmentApp.get('/education_level_short', (req, res, next) => {
    req.result = [
        {id: null, name: 'Não classificada'},
        {id: 1, name: 'Creche'},
        {id: 2, name: 'Pré-Escola'},
        {id: 3, name: 'Ensino Fundamental - anos iniciais'},
        {id: 4, name: 'Ensino Fundamental - anos finais'},
        {id: 5, name: 'Ensino Médio'},
        {id: 6, name: 'EJA'},
        {id: 7, name: 'EE exclusiva'}
    ];
    next();
}, response('education_level_short'));

// Returns all adm dependencies
enrollmentApp.get('/adm_dependency', (req, res, next) => {
    req.sql.from('dependencia_adm')
    .field('id')
    .field('nome', 'name')
    .where('id <= 4');
    next();
}, query, response('adm_dependency'));

enrollmentApp.get('/adm_dependency_detailed', (req, res, next) => {
    req.sql.from('dependencia_adm_priv')
    .field('id', 'id')
    .field('nome', 'name');
    next();
}, query, response('adm_dependency_detailed'));

// Return genders
enrollmentApp.get('/gender', (req, res, next) => {
    req.result = [
        {id: 1, name: 'Masculino'},
        {id: 2, name: 'Feminino'}
    ];
    next();
}, response('gender'));

// Return ethnic group
enrollmentApp.get('/ethnic_group', (req, res, next) => {
    req.result = [];
    for(let i = 0; i <=5; ++i) {
        req.result.push({
            id: i,
            name: id2str.ethnicGroup(i)
        });
    }
    next();
}, response('ethnic_group'));

enrollmentApp.get('/period', (req, res, next) => {
    req.result = [];
    for(let i = 1; i <= 3; ++i) {
        req.result.push({
            id: i,
            name: id2str.period(i)
        });
    }
    req.result.push({
        id: 99,
        name: id2str.period(99)
    });
    next();
}, response('period'));

// Returns integral-time avaible
enrollmentApp.get('/integral_time', (req, res, next) => {
    req.result = [
        {id: null, name: 'Não Disponível'},
        {id: 0, name: 'Não'},
        {id: 1, name: 'Sim'}
    ];
    next();
}, response('integral_time'));

rqf.addField({
    name: 'filter',
    field: false,
    where: true
}).addField({
    name: 'dims',
    field: true,
    where: false
}).addValue({
    name: 'adm_dependency',
    table: 'matricula',
    tableField: 'dependencia_adm_id',
    resultField: 'adm_dependency_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'dependencia_adm_id'
    }
}).addValue({
    name: 'adm_dependency_detailed',
    table: 'matricula',
    tableField: 'dependencia_adm_priv',
    resultField: 'adm_dependency_detailed_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'dependencia_adm_priv'
    }
}).addValue({
    name: 'school_year',
    table: 'matricula',
    tableField: 'serie_ano_id',
    resultField: 'school_year_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'serie_ano_id'
    }
}).addValue({
    name: 'education_level',
    table: 'matricula',
    tableField: 'etapa_ensino_id',
    resultField: 'education_level_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'etapa_ensino_id'
    }
}).addValue({
    name: 'education_level_mod',
    table: 'matricula',
    tableField: 'etapas_mod_ensino_segmento_id',
    resultField: 'education_level_mod_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'etapas_mod_ensino_segmento_id'
    }
}).addValue({
    name: 'education_level_short',
    table: 'matricula',
    tableField: 'etapa_resumida',
    resultField: 'education_level_short_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'etapa_resumida'
    }
}).addValue({
    name: 'region',
    table: 'regiao',
    tableField: 'nome',
    resultField: 'region_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'regiao_id',
        foreignTable: 'matricula'
    }
}).addValue({
    name: 'state',
    table: 'estado',
    tableField: 'nome',
    resultField: 'state_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'estado_id',
        foreignTable: 'matricula'
    }
}).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: 'matricula'
    }
}, 'dims').addValueToField({
    name: 'city',
    table: 'municipio',
    tableField: 'nome',
    resultField: 'city_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'municipio_id',
        foreignTable: 'matricula'
    }
}, 'filter').addValueToField({
    name: 'school',
    table: 'escola',
    tableField: ['nome_escola', 'id'],
    resultField: ['school_name', 'school_id'],
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: ['id', 'ano_censo'],
        foreign: ['escola_id', 'ano_censo'],
        foreignTable: 'matricula'
    }
}, 'dims').addValueToField({
    name: 'school',
    table: 'escola',
    tableField: 'nome_escola',
    resultField: 'school_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: ['id', 'ano_censo'],
        foreign: ['escola_id', 'ano_censo'],
        foreignTable: 'matricula'
    }
}, 'filter').addValue({
    name: 'location',
    table: 'matricula',
    tableField: 'localizacao_id',
    resultField: 'location_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'localizacao_id'
    }
}).addValue({
    name: 'rural_location',
    table: 'matricula',
    tableField: 'localidade_area_rural',
    resultField: 'rural_location_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'localidade_area_rural'
    }
}).addValue({
    name: 'min_year',
    table: 'matricula',
    tableField: 'ano_censo',
    resultField: 'year',
    where: {
        relation: '>=',
        type: 'integer',
        field: 'ano_censo'
    }
}).addValue({
    name: 'max_year',
    table: 'matricula',
    tableField: 'ano_censo',
    resultField: 'year',
    where: {
        relation: '<=',
        type: 'integer',
        field: 'ano_censo'
    }
}).addValue({
    name: 'gender',
    table: 'matricula',
    tableField: 'sexo',
    resultField: 'gender_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'sexo'
    }
}).addValue({
    name: 'ethnic_group',
    table: 'matricula',
    tableField: 'cor_raca_id',
    resultField: 'ethnic_group_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'cor_raca_id'
    }
}).addValue({
    name: 'period',
    table: 'matricula',
    tableField: 'turma_turno_id',
    resultField: 'period_id',
    where: {
        relation: '=',
        type: 'integer',
        field: 'turma_turno_id'
    }
}).addValue({
  name:'integral_time',
  table: 'matricula',
  tableField: 'tempo_integral',
  resultField: 'integral_time_id',
  where: {
      relation: '=',
      type: 'boolean',
      field: 'tempo_integral'
  }
});

enrollmentApp.get('/', rqf.parse(), rqf.build(), (req, res, next) => {
    log.debug(req.sql.toParam());
    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();
}, query, id2str.transform(false), response('enrollment'));

let simRqf = new ReqQueryFields();

simRqf.addField({
    name: 'filter',
    field: false,
    where: true
}).addValue({
    name: 'simulation_time',
    parseOnly: true
}).addValue({
    name: 'city',
    table: 'municipio',
    tableField: 'nome',
    resultField: 'city_name',
    where: {
        relation: '=',
        type: 'integer',
        field: 'id'
    },
    join: {
        primary: 'id',
        foreign: 'municipio_id',
        foreignTable: 'uc408'
    }
});

enrollmentApp.get('/download', (req, res, next) => {
    // first, query the mapping
    req.sql.from('mapping_matricula')
    .field('target_name')
    .field('name');
next();
}, query, (req, res, next) => {
    req.resetSql();
    next();
}, rqf.parse(), rqf.build(), (req, res, next) => {
    let username = req.query.user;
    let email = req.query.email;

    req.sql.from('matricula')
    .field('*');
    let header = '';
    req.result.forEach((result) => {
        if(header === '') header += result.name;
        else header = header + ';' + result.name;
    });

    let form = {
        query: req.sql.toString(),
        table: req.sql.tableFrom,
        name: req.sql.tableFrom,
        username,
        email,
        header
    };
    request.post(config.cdn.url + '/api/v1/file', {form}, (err, response, body) => {
        if(err) {
            log.error(err);
            return res.json({error: err});
        }
        console.log(body);
        res.json({msg: 'Wait for download email'});
    });
});

module.exports = enrollmentApp;