/*
Copyright 2015, 2016 OpenMarket Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

'use strict';

var React = require('react');

const KEY_TAB = 9;
const KEY_SHIFT = 16;
const KEY_WINDOWS = 91;

module.exports = React.createClass({
    displayName: 'EditableText',
    propTypes: {
        onValueChanged: React.PropTypes.func,
        initialValue: React.PropTypes.string,
        label: React.PropTypes.string,
        placeholder: React.PropTypes.string,
        className: React.PropTypes.string,
        labelClassName: React.PropTypes.string,
        placeholderClassName: React.PropTypes.string,
        blurToCancel: React.PropTypes.bool,
    },

    Phases: {
        Display: "display",
        Edit: "edit",
    },

    value: '',
    placeholder: false,

    getDefaultProps: function() {
        return {
            onValueChanged: function() {},
            initialValue: '',
            label: '',
            placeholder: '',
        };
    },

    getInitialState: function() {
        return {
            phase: this.Phases.Display,
        }
    },

    componentWillReceiveProps: function(nextProps) {
        this.value = nextProps.initialValue;
    },

    componentDidMount: function() {
        this.value = this.props.initialValue;
        if (this.refs.editable_div) {
            this.showPlaceholder(!this.value);
        }
    },

    showPlaceholder: function(show) {
        if (show) {
            this.refs.editable_div.textContent = this.props.placeholder;
            this.refs.editable_div.setAttribute("class", this.props.className + " " + this.props.placeholderClassName);
            this.placeholder = true;
            this.value = '';
        }
        else {
            this.refs.editable_div.textContent = this.value;
            this.refs.editable_div.setAttribute("class", this.props.className);
            this.placeholder = false;
        }            
    },

    getValue: function() {
        return this.value;
    },

    edit: function() {
        this.setState({
            phase: this.Phases.Edit,
        });
    },

    cancelEdit: function() {
        this.setState({
            phase: this.Phases.Display,
        });
        this.onValueChanged(false);
    },

    onValueChanged: function(shouldSubmit) {
        this.props.onValueChanged(this.value, shouldSubmit);
    },

    onKeyDown: function(ev) {
        // console.log("keyDown: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
        
        if (this.placeholder) {
            if (ev.keyCode !== KEY_SHIFT && !ev.metaKey && !ev.ctrlKey && !ev.altKey && ev.keyCode !== KEY_WINDOWS && ev.keyCode !== KEY_TAB) {
                this.showPlaceholder(false);
            }
        }

        if (ev.key == "Enter") {
            ev.stopPropagation();
            ev.preventDefault();
        }

        // console.log("keyDown: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
    },

    onKeyUp: function(ev) {
        // console.log("keyUp: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);

        if (!ev.target.textContent) {
            this.showPlaceholder(true);
        }
        else if (!this.placeholder) {
            this.value = ev.target.textContent;
        }

        if (ev.key == "Enter") {
            this.onFinish(ev);
        } else if (ev.key == "Escape") {
            this.cancelEdit();
        }

        // console.log("keyUp: textContent=" + ev.target.textContent + ", value=" + this.value + ", placeholder=" + this.placeholder);
    },

    onClickDiv: function(ev) {
        this.setState({
            phase: this.Phases.Edit,
        })
    },

    onFocus: function(ev) {
        //ev.target.setSelectionRange(0, ev.target.textContent.length);
    },

    onFinish: function(ev) {
        var self = this;
        this.setState({
            phase: this.Phases.Display,
        }, function() {
            self.onValueChanged(ev.key === "Enter");
        });
    },

    onBlur: function(ev) {
        if (this.props.blurToCancel)
            this.cancelEdit();
        else
            this.onFinish(ev)
    },

    render: function() {
        var editable_el;

        if (this.state.phase == this.Phases.Display && (this.props.label || this.props.labelClassName) && !this.value) {
            // show the label
            editable_el = <div className={this.props.className + " " + this.props.labelClassName} onClick={this.onClickDiv}>{this.props.label}</div>;
        } else {
            // show the content editable div, but manually manage its contents as react and contentEditable don't play nice together
            editable_el = <div ref="editable_div" contentEditable="true" className={this.props.className}
                               onKeyDown={this.onKeyDown} onKeyUp={this.onKeyUp} onFocus={this.onFocus} onBlur={this.onBlur}></div>;
        }

        return editable_el;
    }
});