import React from 'react';
import PropTypes from 'prop-types';

import { Input, Textarea, Select, Enabler } from './';
import { FormObjToJSON, format, autocomplete, notify } from '../helpers/';
import { t } from '../locales/';

import "./formbuilder.scss";

export class FormBuilder extends React.Component {
    constructor(props){
        super(props);
    }

    section(struct, key, level = 0){
        if(struct == null) struct = "";
        const isALeaf = function(struct){
            if("label" in struct && "type" in struct &&
               "value" in struct && "default" in struct){
                return true;
            }
            return false;
        };

        if(Array.isArray(struct)) return null;
        else if(isALeaf(struct) === false){
            const [normal, advanced] = function(s){
                let _normal = [];
                let _advanced = [];
                for (let key in s){
                    const tmp = {key: key, data: s[key]};
                    'id' in s[key] ? _advanced.push(tmp) : _normal.push(tmp);
                }
                return [_normal, _advanced];
            }(struct);
            if(level <= 1){
                return (
                    <div className="formbuilder">
                      {
                          key ? <h2 className="no-select">{ format(key) }</h2> : ""
                      }
                      {
                          normal.map((s, index) => {
                              return (
                                  <div key={s.key+"-"+index}>
                                    { this.section(s.data, s.key, level + 1) }
                                  </div>
                              );
                          })
                      }
                      <div className="advanced_form">
                        {
                            advanced.map((s, index) => {
                                return (
                                    <div key={s.key+"-"+index}>
                                      { this.section(s.data, s.key, level + 1) }
                                    </div>
                                );
                            })
                        }
                      </div>
                    </div>
                );
            }
            return (
                <div>
                  <fieldset>
                    <legend className="no-select">{ format(key) }</legend>
                    {
                        Object.keys(struct).map((key, index) => {
                            return (
                                <div key={key+"-"+index}>
                                  { this.section(struct[key], key, level + 1) }
                                </div>
                            );
                        })
                    }
                  </fieldset>
                </div>
            );
        }

        let id = {};
        let target = [];
        if(struct.id !== undefined){
            id.id = this.props.idx === undefined ? struct.id : struct.id + "_" + this.props.idx;
        }
        if(struct.type === "enable"){
            target = struct.target.map((target) => {
                return this.props.idx === undefined ? target : target + "_" + this.props.idx;
            });
        }

        const onChange = function(e, fn){
            struct.value = e;
            if(typeof fn === "function"){
                fn(struct);
            }
            this.props.onChange.call(
                this,
                FormObjToJSON(this.props.form)
            );
        };

        return ( <FormElement render={this.props.render} onChange={onChange.bind(this)} {...id} params={struct} target={target} name={ format(struct.label) } /> );
    }

    render(){
        return this.section(this.props.form || {});
    }
}


const FormElement = (props) => {
    const id = props.id !== undefined ? {id: props.id} : {};
    let struct = props.params;
    let $input = ( <Input onChange={(e) => props.onChange(e.target.value)} {...id} name={struct.label} type="text" defaultValue={struct.value} placeholder={ t(struct.placeholder) } /> );
    switch(props.params["type"]){
    case "text":
        const onTextChange = (value) => {
            if(value === ""){
                value = null;
            }
            props.onChange(value);
        };

        const list_id = struct.datalist ? "list_"+Math.random() : null;
        $input = ( <Input list={list_id} onChange={(e) => onTextChange(e.target.value)} {...id} name={struct.label} type="text" value={struct.value || ""} placeholder={ t(struct.placeholder) } readOnly={struct.readonly}/> );
        if(list_id != null){
            const filtered = function(multi, datalist, currentValue){
                if(multi !== true || currentValue == null) return datalist;

                return autocomplete(
                    currentValue
                        .split(",")
                        .map((t) => t.trim())
                        .filter((t) => t),
                    datalist
                );
            };
            $input = (
                <span>
                  { $input }
                  <datalist id={list_id}>
                    {
                        filtered(struct.multi, struct.datalist, struct.value).map((item,i) => {
                            return ( <option key={i} value={item} /> );
                        })
                    }
                  </datalist>
                </span>
            );
        }
        break;
    case "number":
        const onNumberChange = (value) => {
            value = value === "" ? null : parseInt(value);
            props.onChange(value);
        };
        $input = ( <Input onChange={(e) => onNumberChange(e.target.value)} {...id} name={struct.label} type="number" value={struct.value === null ? "" : struct.value} placeholder={ t(struct.placeholder) } /> );
        break;
    case "password":
        const onPasswordChange = (value) => {
            if(value === ""){
                value = null;
            }
            props.onChange(value);
        };
        $input = ( <Input onChange={(e) => onPasswordChange(e.target.value)} {...id} name={struct.label} type="password" value={struct.value || ""} placeholder={ t(struct.placeholder) } /> );
        break;
    case "long_password":
        const onLongPasswordChange = (value) => {
            if(value === ""){
                value = null;
            }
            props.onChange(value);
        };
        $input = (
            <Textarea {...id} disabledEnter={true} value={struct.value || ""} onChange={(e) => onLongPasswordChange(e.target.value)} type="text" rows="1" name={struct.label} placeholder={ t(struct.placeholder) }  autoComplete="new-password" />
        );
        break;
    case "long_text":
        $input = ( <Textarea {...id} disabledEnter={true} value={struct.value || ""} onChange={(e) => props.onChange(e.target.value)} type="text" rows="3" name={struct.label} placeholder={ t(struct.placeholder) }  autoComplete="new-password" /> );
        break;
    case "bcrypt":
        const onBcryptChange = (value) => {
            if(value === ""){
                return props.onChange(null);
            }
            return import(/* webpackChunkName: "bcrypt" */"../helpers/bcrypt")
                .catch((err) => notify.send(err && err.message, "error"))
                .then((bcrypt) => bcrypt.bcrypt_password(value))
                .then((hash) => props.onChange(hash));
        };
        $input = ( <Input onChange={(e) => onBcryptChange(e.target.value)} {...id} name={struct.label} type="password" defaultValue={struct.value || ""} placeholder={ t(struct.placeholder) } /> );
        break;
    case "hidden":
        $input = ( <Input name={struct.label} type="hidden" defaultValue={struct.value} /> );
        break;
    case "boolean":
        $input = ( <Input onChange={(e) => props.onChange(e.target.checked)} {...id} name={struct.label} type="checkbox" checked={struct.value === null ? !!struct.default : struct.value} /> );
        break;
    case "select":
        $input = ( <Select onChange={(e) => props.onChange(e.target.value)} {...id} name={struct.label} choices={struct.options} value={struct.value === null ? struct.default : struct.value} placeholder={ t(struct.placeholder) } />);
        break;
    case "enable":
        $input = ( <Enabler onChange={(e) => props.onChange(e.target.checked)} {...id} name={struct.label} target={props.target} defaultValue={struct.value === null ? struct.default : struct.value} /> );
        break;
    case "date":
        $input = ( <Input onChange={(e) => props.onChange(e.target.value)} {...id} name={struct.label} type="date" defaultValue={struct.value || ""} placeholder={ t(struct.placeholder) } /> );
        break;
    case "datetime":
        $input = ( <Input onChange={(e) => props.onChange(e.target.value)} {...id} name={struct.label} type="datetime-local" defaultValue={struct.value || ""} placeholder={ t(struct.placeholder) } /> );
        break;
    case "image":
        $input = ( <img {...id} src={struct.value} /> );
        break;
    case "file":
        const getBase64 = function(file){
            return new Promise((resolve, reject) => {
                const reader = new window.FileReader();
                reader.readAsDataURL(file);
                reader.onload = () => resolve(reader.result);
                reader.onerror = error => reject(error);
            });
        };
        const onFileUpload = (e) => {
            if(e.target.files.length !== 1) return;
            if(e.target.files[0].size < 200000000){
                getBase64(e.target.files[0]).then((a) => {
                    props.onChange(a);
                }).catch(() => {});
                return;
            }
            notify.send("File is too large", "WARNING");
        };
        $input = (
            <div className="fileupload-image">
              <input onChange={(e) => onFileUpload(e)} type="file" {...id} name={struct.label} />
                { struct.value.substring(0,10) === "data:image" ? <img src={struct.value} /> : null }
                { struct.value.substring(0,20) === "data:application/pdf" ? <object data={struct.value} type="application/pdf" /> : null }
            </div>
        );
        break;
    case "oauth2":
        $input = null;
        break;
    }

    return props.render($input, props, struct, props.onChange.bind(null, null));
};

FormElement.propTypes = {
    render: PropTypes.func.isRequired
};