/*
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';

const 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,
        // Overrides blurToSubmit if true
        blurToCancel: React.PropTypes.bool,
        // Will cause onValueChanged(value, true) to fire on blur
        blurToSubmit: React.PropTypes.bool,
        editable: React.PropTypes.bool,
    },

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

    getDefaultProps: function() {
        return {
            onValueChanged: function() {},
            initialValue: '',
            label: '',
            placeholder: '',
            editable: true,
            className: "mx_EditableText",
            placeholderClassName: "mx_EditableText_placeholder",
            blurToSubmit: false,
        };
    },

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

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

    componentWillMount: function() {
        // we track value as an JS object field rather than in React state
        // as React doesn't play nice with contentEditable.
        this.value = '';
        this.placeholder = false;
    },

    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;
    },

    setValue: function(value) {
        this.value = value;
        this.showPlaceholder(!this.value);
    },

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

    cancelEdit: function() {
        this.setState({
            phase: this.Phases.Display,
        });
        this.value = this.props.initialValue;
        this.showPlaceholder(!this.value);
        this.onValueChanged(false);
        this.refs.editable_div.blur();
    },

    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) {
            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) {
        if (!this.props.editable) return;

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

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

        const node = ev.target.childNodes[0];
        if (node) {
            const range = document.createRange();
            range.setStart(node, 0);
            range.setEnd(node, node.length);

            const sel = window.getSelection();
            sel.removeAllRanges();
            sel.addRange(range);
        }
    },

    onFinish: function(ev, shouldSubmit) {
        const self = this;
        const submit = (ev.key === "Enter") || shouldSubmit;
        this.setState({
            phase: this.Phases.Display,
        }, function() {
            if (this.value !== this.props.initialValue) {
                self.onValueChanged(submit);
            }
        });
    },

    onBlur: function(ev) {
        const sel = window.getSelection();
        sel.removeAllRanges();

        if (this.props.blurToCancel) {this.cancelEdit();} else {this.onFinish(ev, this.props.blurToSubmit);}

        this.showPlaceholder(!this.value);
    },

    render: function() {
        let editable_el;

        if (!this.props.editable || (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 || this.props.initialValue }</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;
    },
});