import React from 'react';
import { FormBuilder, Icon, Input, Alert } from "../../components/";
import { Backend, Config } from "../../model/";
import { FormObjToJSON, notify, format, createFormBackend } from "../../helpers/";
import { t } from '../../locales/';

import "./backend.scss";

export class BackendPage extends React.Component {
    constructor(props){
        super(props);
        this.state = {
            backend_enabled: [],
            backend_available: [],
            auth_available: ["LDAP", "SAML", "OpenID", "External"],
            auth_enabled: null,
            config: null
        };
    }

    componentDidMount(){
        Promise.all([
            Backend.all(),
            Config.all()
        ]).then((data) => {
            let [backend, config] = data;
            this.setState({
                backend_available: backend,
                backend_enabled: window.CONFIG["connections"].map((conn) => {
                    return createFormBackend(backend, conn);
                }),
                config: config
            });
        });
    }

    onChange(e){
        this.setState({refresh: Math.random()}); // refresh the screen to refresh the mutation
                                                 // that have happenned down the stack

        let json = FormObjToJSON(this.state.config);
        json.connections = this.state.backend_enabled.map((backend) => {
            let data = FormObjToJSON(backend, (obj, key) => {
                if(obj[key].enabled === true){
                    obj[key] = obj[key].value || obj[key].default;
                } else {
                    delete obj[key];
                }
            });
            const key = Object.keys(data)[0];
            return data[key];
        });

        // persist config object in the backend
        this.props.isSaving(true);
        return Config.save(json, true, () => {
            this.props.isSaving(false);
        }, (err) => {
            notify.send(err && err.message || t('Oops'), 'error');
            this.props.isSaving(false);
        });
    }

    addBackend(backend_id){        
        this.setState({
            backend_enabled: this.state.backend_enabled.concat(
                createFormBackend(this.state.backend_available, {
                    type: backend_id,
                    label: backend_id.toUpperCase()
                })
            )
        }, this.onChange.bind(this));
    }

    removeBackend(n){
        this.setState({
            backend_enabled: this.state.backend_enabled.filter((_, i) => i !== n)
        }, this.onChange.bind(this));
    }

    onClickAuthAvailable(auth){
        this.setState({
            auth_enabled: this.state.auth_enabled === auth ? null : auth
        });
    }

    render(){
        const update = (value, struct) => {
            struct.enabled = value;
            this.setState({refresh: Math.random()});
            if(value === false){
                struct.value = null;
            }
            return;
        };

        const enable = (struct) => {
            if(typeof struct.value === "string"){
                struct.enabled = true;
                return true;
            }
            return !!struct.enabled;
        };

        const isActiveBackend = (backend_key) => {
            return this.state.backend_enabled
                .map((b) => Object.keys(b)[0])
                .indexOf(backend_key) !== -1;            
        };

        const isActiveAuth = (auth_key) => {
            return auth_key === this.state.auth_enabled;
        };

        return (
            <div className="component_dashboard">
              <h2>Enabled Backends</h2>
              <div className="box-container">
                {
                    Object.keys(this.state.backend_available)
                        .sort((a, b) => a > b)
                        .map((backend_available, index) => (
                            <div key={index} onClick={this.addBackend.bind(this, backend_available)}
                                 className={"box-item pointer no-select" + (isActiveBackend(backend_available) ? " active": "")}>
                              <div>
                                { backend_available }
                                <span className="no-select">
                                  <span className="icon">+</span>
                                </span>
                              </div>
                            </div>
                        ))
                }
              </div>

              <h2>Authentication Middleware</h2>
              
              <Alert>
                Integrate Filestash with your identity management system
              </Alert>

              <div className="box-container">
                {
                    this.state.auth_available.map((auth) => (
                        <div onClick={this.onClickAuthAvailable.bind(this, auth)} key={auth}
                             className={"box-item pointer no-select" + (isActiveAuth(auth) ? " active": "")}>
                          <div>
                            { auth }
                            <span className="no-select">
                              <span className="icon">
                                { isActiveAuth(auth) === false ? "+" : <Icon name="delete" /> }
                              </span>
                            </span>
                          </div>
                        </div>
                    ))
                }
              </div>

              {
                  this.state.auth_enabled !== null && (
                      <React.Fragment>
                        <Alert className="success">
                          <i><strong>Register your interest: <a href={`mailto:mickael@kerjean.me?Subject=Filestash - Authentication Middleware - ${this.state.auth_enabled}`}>mickael@kerjean.me</a></strong></i>
                        </Alert>

                        
                      </React.Fragment>
                  )
              }

              <h2>Backend Configuration</h2>

              {
                  this.state.backend_enabled.length !== 0 ? <div>
                    <form>
                      {
                          this.state.backend_enabled.map((backend_enable, index) => {
                              return (
                                  <div key={index}>
                                    <div className="icons no-select" onClick={this.removeBackend.bind(this, index)}>
                                      <Icon name="delete" />
                                    </div>
                                    <FormBuilder onChange={this.onChange.bind(this)} 
                                                 idx={index} 
                                                 key={index}
                                                 form={{"": backend_enable}}
                                                 autoComplete="new-password"
                                                 render={ ($input, props, struct, onChange) => {
                                                     let $checkbox = (
                                                         <Input type="checkbox" style={{width: "inherit", marginRight: '6px', top: '6px'}}
                                                                checked={enable(struct)} onChange={(e) => onChange(update.bind(this, e.target.checked))}/>
                                                     );
                                                     if(struct.label === "label"){
                                                         $checkbox = null;
                                                     } else if(struct.readonly === true) {
                                                         $checkbox = null;
                                                     }
                                                     return (
                                                         <label className={"no-select input_type_" + props.params["type"]}>
                                                           <div>
                                                             <span>
                                                               { $checkbox }
                                                               { format(struct.label) }:
                                                             </span>
                                                             <div style={{width: '100%'}}>
                                                               { $input }
                                                             </div>
                                                           </div>
                                                           <div>
                                                             <span className="nothing"></span>
                                                             <div style={{width: '100%'}}>
                                                               {
                                                                   struct.description ? (<div className="description">{struct.description}</div>) : null
                                                               }
                                                             </div>
                                                           </div>
                                                         </label>
                                                     );
                                                 }} />
                                  </div>
                              );
                          })
                      }
                    </form>
                  </div> : <Alert>You need to enable a backend first.</Alert>
              } 
            </div>
        );
    }
}