import React, { FunctionComponent, useState, useEffect, ChangeEvent, MouseEvent } from 'react';
import { DecisionSupportFileUpdaterProps } from './DecisionSupportFileUpdaterProps';
import { base58UUID } from "../../util/uuid";

export interface OptionsSectionProps extends DecisionSupportFileUpdaterProps {};

const OptionsSectionName = 'options';

export const OptionsSection: FunctionComponent<OptionsSectionProps> = ({ dsf, updateDSF, readOnly }) => {
  interface OptionsSectionState {
    changed: boolean
    section: OptionsSection
  }
  
  interface OptionsSection {
     options: Option[]
  }
  
  interface Option {
      id: string
      label: string
      pros: string
      cons: string
  }
  
  const [ state, setState ] = useState<OptionsSectionState>({
     changed: false,
     section: {
       options: [],
     }
  });

  useEffect(() => {
    if (!state.changed) return;
    updateDSF({ ...dsf, sections: { ...dsf.sections, [OptionsSectionName]: { ...state.section }} })
    setState(state => ({ ...state, changed: false }));
  }, [state.changed]);

  useEffect(() => {
    if (!dsf.sections[OptionsSectionName]) return;
    setState(state => ({ ...state, changed: false, section: {...state.section, ...dsf.sections[OptionsSectionName] }}));
  }, [dsf.sections[OptionsSectionName]]);

  function newOption(label: string, pros: string, cons: string): Option {
    return {
      id: base58UUID(),
      label,
      pros,
      cons
    };
  }

  const onAddOptionClick = (evt: MouseEvent) => {
    const options = JSON.parse(JSON.stringify(state.section.options))
    const option = newOption("Décision", "", "");
    options.push(option);
    setState(state => ({ ...state, changed: true, section: { ...state.section, options }}));
  };

  const onOptionChange = (id: number, attrName: string, evt: ChangeEvent<HTMLInputElement>) => {
    const target = evt.currentTarget;
    const value = target.hasOwnProperty('checked') ? target.checked : target.value;
    const options = JSON.parse(JSON.stringify(state.section.options))
    options[id][attrName] = value;
    setState(state => ({ ...state, changed: true, section: { ...state.section, options }}));
  };

  const onRemoveOptionClick = (id: number, evt: MouseEvent) => {
    if(confirm('Voulez-vous supprimer cette option ?')){
      const options = JSON.parse(JSON.stringify(state.section.options))
      options.splice(id, 1);
      setState(state => ({ ...state, changed: true, section: { ...state.section, options }}));
    }
  };

  return (
    <section>
      <h4 id="options-section" className="is-size-4 title is-spaced">Explorer les options</h4>
      <div className="table-container">
            <table className={`table is-bordered is-striped is-hoverable is-fullwidth`}>
                <thead>
                    <tr>
                        <th></th>
                        <th>Décision</th>
                        <th>Pours</th>
                        <th>Contres</th>
                    </tr>
                </thead>
                <tbody>
                    {
                        state.section.options.map((o, index) => {
                            return (
                                <tr key={`option-${o.id}`}>
                                    <td>
                                        <button
                                            disabled={readOnly}
                                            onClick={onRemoveOptionClick.bind(null, index)}
                                            className="button is-danger is-small is-outlined">
                                        🗑️
                                        </button>
                                    </td>
                                    <td>
                                      <textarea className="textarea"
                                        readOnly={readOnly}
                                        value={o.label}
                                        onChange={onOptionChange.bind(null, index, 'label')}
                                        placeholder="Décrire cette décision." 
                                        rows={10}>
                                      </textarea>
                                    </td>
                                    <td>
                                      <textarea className="textarea is-success"
                                        value={o.pros}
                                        readOnly={readOnly}
                                        onChange={onOptionChange.bind(null, index, 'pros')}
                                        placeholder="Décrire les avantages de cette décision." 
                                        rows={10}>
                                      </textarea>
                                    </td>
                                    <td>
                                      <textarea className="textarea is-danger"
                                        value={o.cons}
                                        readOnly={readOnly}
                                        onChange={onOptionChange.bind(null, index, 'cons')}
                                        placeholder="Décrire les désavantages de cette décision." 
                                        rows={10}>
                                      </textarea>
                                    </td>
                                </tr>
                            )
                        })
                    }
                    {
                        state.section.options.length === 0 ?
                        <tr>
                            <td></td>
                            <td colSpan={4}>Aucune option pour l'instant.</td>
                        </tr> :
                        null
                    }
                </tbody>
                <tfoot>
                    <tr>
                        <td colSpan={5}>
                          <button
                            disabled={readOnly}
                            className="button is-primary is-pulled-right" 
                            onClick={onAddOptionClick}>
                          Ajouter
                          </button>
                        </td>
                    </tr>
                </tfoot>
            </table>
        </div>
    </section>
  );
};