// Bookshelf
const bookshelf = require('../database/bookshelf').bookshelf;
const model = require('../models/school-model');

// Model validation
const Validator = require('jsonschema').Validator;
const validator = new Validator();
const SchoolValidation = require("../validations/SchoolValidation");
validator.addSchema(SchoolValidation, "/SchoolValidation");

// Validations
const isXSSAttempt = require('../functions').isXSSAttempt;
const isEmptyObject = require('../functions').isEmptyObject;

class SchoolRepository {

    constructor() {
    }

    getAll() {
        return new Promise((resolve, reject) => {
            new model()
                .fetchAll({ withRelated: ['meta_schools'] })
                .then(v => {
                    resolve(v.toJSON({ omitPivot: true }));
                })
                .catch(err => {
                    console.log(err);
                    reject({
                        "message": "Il n'existe aucune école disponible.",
                        "code": 404,
                    });
                });
        });
    }

    getOne(id) {
        return new Promise((resolve, reject) => {
            new model()
                .where({ 'id': id })
                .fetch({ withRelated: ['meta_schools'] })
                .then(v => {
                    resolve(v.toJSON({ omitPivot: true }));
                })
                .catch(err => {
                    console.log(err);
                    reject({
                        "message": "L'école en question n'a pas pu être trouvée.",
                        "code": 404,
                    });
                });
        });
    }

    getSpellsFromOne(id) {
        return new Promise((resolve, reject) => {
            new model()
                .where({ 'id': id })
                .fetch({ withRelated: ['spells', 'spells.schools', 'spells.variables', 'spells.ingredients', 'spells.schools.meta_schools'] })
                .then(v => {
                    resolve(v.toJSON({ omitPivot: true }));
                })
                .catch(err => {
                    console.log(err);
                    reject({
                        "message": "Les sortilèges de cette école n'ont pas pu être récupérés.",
                        "code": 404,
                    });
                });
        });
    }

    addOne(s) {
        return new Promise((resolve, reject) => {
            // Checks if body exists and if the model fits, and throws errors if it doesn't
            if (isEmptyObject(s)) {
                reject({
                    "message": "Le corps de la requête ne peut pas être vide.",
                    "code": 403,
                });
            } else if (!validator.validate(s, SchoolValidation).valid) {
                reject({
                    "message": `Le modèle d'école n'est pas respecté : ${validator.validate(s, SchoolValidation).errors}`,
                    "code": 403,
                });
            } else if (isXSSAttempt(s.name) || isXSSAttempt(s.description)) {
                reject({
                    "message": "Tentative d'injection XSS détectée, requête refusée.",
                    "code": 403,
                });
            } else {
                bookshelf.transaction(t => {
                    return new model({
                        'name': s.name,
                        'description': s.description,
                        'meta_school_id': s.meta_school_id,
                    }).save(null, {
                        transacting: t
                    })
                        .catch(err => {
                            throw err;
                        });
                })
                    .then(v => {
                        return v.load(['meta_schools']);
                    })
                    .then(v => {
                        resolve(this.getOne(v.id));
                    })
                    .catch(err => {
                        console.log(err);
                        reject({
                            "message": "Une erreur d'insertion s'est produite.",
                            "code": 500,
                        });
                    });
            }
        });
    }

    updateOne(id, s) {
        return new Promise((resolve, reject) => {
            // Checks if body exists and if the model fits, and throws errors if it doesn't
            if (isEmptyObject(s)) {
                reject({
                    "message": "Le corps de la requête ne peut pas être vide.",
                    "code": 403,
                });
            } else if (!validator.validate(s, SchoolValidation).valid) {
                reject({
                    "message": `Le modèle d'école n'est pas respecté : ${validator.validate(s, SchoolValidation).errors}`,
                    "code": 403,
                });
            } else if (isXSSAttempt(s.name) || isXSSAttempt(s.description)) {
                reject({
                    "message": "Tentative d'injection XSS détectée, requête refusée.",
                    "code": 403,
                });
            } else {
                new model({ id: id })
                    .fetch({ require: true, withRelated: ['meta_schools'] })
                    .then(v => {
                        bookshelf.transaction(t => {
                            return v.save({
                                'name': s.name,
                                'description': s.description,
                                'meta_school_id': s.meta_school_id
                            }, {
                                method: 'update',
                                transacting: t
                            })
                                .catch(err => {
                                    console.log(err);
                                    throw err;
                                });
                        })
                            .then(v => {
                                return v.load(['meta_schools']);
                            })
                            .then(v => {
                                resolve(this.getOne(v.id));
                            })
                            .catch(err => {
                                console.log(err);
                                reject({
                                    "message": "Une erreur d'insertion s'est produite.",
                                    "code": 500,
                                });
                            });
                    })
                    .catch(err => {
                        console.log(err);
                        reject({
                            "message": "L'école en question n'a pas été trouvée.",
                            "code": 404,
                        });
                    });
            }
        });
    }

    deleteOne(id) {
        return new Promise((resolve, reject) => {
            new model()
                .where({ 'id': id })
                .fetch({ require: true, withRelated: ['spells', 'meta_schools'] })
                .then(v => {
                    v.spells().detach();
                    v.destroy();
                })
                .then(() => {
                    resolve({
                        'message': 'School with ID ' + id + ' successfully deleted !'
                    });
                })
                .catch(err => {
                    console.log(err);
                    reject({
                        "message": "L'école en question n'a pas été trouvée.",
                        "code": 404,
                    });
                });
        });
    }
}

module.exports = SchoolRepository;