const errors = require("./errors.js");
import {  DatasRenders, DatasRendersSettings } from "./freeDatas2HTMLInterfaces";
import { FreeDatas2HTML } from "./freeDatas2HTML";

export class Render implements DatasRenders
{
    private _converter: FreeDatas2HTML;
    public settings:  DatasRendersSettings;
    static readonly defaultSettings = 
    {
            allBegining:"<table>",
            allEnding:"</table>",
            fieldsBegining:"<thead><tr>",
            fieldsEnding:"</tr></thead>",
            fieldDisplaying:"<th>#FIELDNAME</th>",
            linesBegining:"<tbody>",
            linesEnding:"</tbody>",
            lineBegining:"<tr>",
            lineEnding:"</tr>",
            dataDisplaying:"<td>#VALUE</td>",
        };

    // Injection de la classe principale
    constructor(converter: FreeDatas2HTML, settings:DatasRendersSettings=Render.defaultSettings)
    {
        this._converter=converter;
        this.settings=settings;
    }

    // Reçoit les données à afficher et retourne le HTML correspondant.
    public rend2HTML(datas: any[]) : string
    {
        // Il peut n'y avoir aucune donnée (filtres...), mais les noms des champs doivent être connus.
        if(this._converter.fields === undefined)
            throw new Error(errors.renderNeedDatas);
        else
        {
            let datasHTML=this.settings.allBegining;
            // On ne souhaite pas nécessairement afficher les noms des champs
            if(this.settings.fieldsBegining !== undefined && this.settings.fieldDisplaying !== undefined && this.settings.fieldsEnding !== undefined )
            {
                datasHTML+=this.settings.fieldsBegining;
                for (let i in this._converter.fields)
                    datasHTML+=this.settings.fieldDisplaying.replace("#FIELDNAME", this._converter.fields[Number(i)]);
                datasHTML+=this.settings.fieldsEnding;
            }
            datasHTML+=this.settings.linesBegining;
            for (let row in datas)
            {
                datasHTML+=this.settings.lineBegining;
                for(let field in datas[row])
                {
                    // On n'affiche que les champs attendus et signale les erreurs dans la console
                    if(this._converter.fields.indexOf(field) !== -1)
                        datasHTML+=this.settings.dataDisplaying.replace("#VALUE" , datas[row][field]).replace("#FIELDNAME" , field);
                    else
                        console.log(errors.renderUnknownField+field);
                }
                datasHTML+=this.settings.lineEnding;
            }
            datasHTML+=this.settings.linesEnding+this.settings.allEnding;
            return datasHTML;
        }
    }
}