'use strict';

import React from 'react';

import FileDragAndDropDialog from './file_drag_and_drop_dialog';
import FileDragAndDropPreviewIterator from './file_drag_and_drop_preview_iterator';


// Taken from: https://github.com/fedosejev/react-file-drag-and-drop
let FileDragAndDrop = React.createClass({
    propTypes: {
        className: React.PropTypes.string,
        onDragStart: React.PropTypes.func,
        onDrop: React.PropTypes.func.isRequired,
        onDrag: React.PropTypes.func,
        onDragEnter: React.PropTypes.func,
        onLeave: React.PropTypes.func,
        onDragLeave: React.PropTypes.func,
        onDragOver: React.PropTypes.func,
        onDragEnd: React.PropTypes.func,
        filesToUpload: React.PropTypes.array,
        handleDeleteFile: React.PropTypes.func,
        handleCancelFile: React.PropTypes.func,
        handlePauseFile: React.PropTypes.func,
        handleResumeFile: React.PropTypes.func,
        multiple: React.PropTypes.bool,
        dropzoneInactive: React.PropTypes.bool,
        areAssetsDownloadable: React.PropTypes.bool,
        areAssetsEditable: React.PropTypes.bool
    },

    handleDragStart(event) {
        if (typeof this.props.onDragStart === 'function') {
            this.props.onDragStart(event);
        }
    },

    handleDrag(event) {
        if (typeof this.props.onDrag === 'function') {
            this.props.onDrag(event);
        }
    },

    handleDragEnd(event) {
        if (typeof this.props.onDragEnd === 'function') {
          this.props.onDragEnd(event);
        }
    },

    handleDragEnter(event) {
        if (typeof this.props.onDragEnter === 'function') {
            this.props.onDragEnter(event);
        }
    },

    handleDragLeave(event) {
        if (typeof this.props.onDragLeave === 'function') {
            this.props.onDragLeave(event);
        }
    },

    handleDragOver(event) {
        event.preventDefault();

        if (typeof this.props.onDragOver === 'function') {
            this.props.onDragOver(event);
        }
    },

    handleDrop(event) {
        event.preventDefault();
        event.stopPropagation();
        let files;

        // handle Drag and Drop
        if(event.dataTransfer && event.dataTransfer.files.length > 0) {
            files = event.dataTransfer.files;
        } else if(event.target.files) { // handle input type file
            files = event.target.files;
        }

        if(typeof this.props.onDrop === 'function' && files) {
          this.props.onDrop(files);
        }

    },

    handleDeleteFile(fileId) {
        // input's value is not change the second time someone
        // inputs the same file again, therefore we need to reset its value
        this.refs.fileinput.getDOMNode().value = '';
        this.props.handleDeleteFile(fileId);
    },

    handleCancelFile(fileId) {
        // input's value is not change the second time someone
        // inputs the same file again, therefore we need to reset its value
        this.refs.fileinput.getDOMNode().value = '';
        this.props.handleCancelFile(fileId);
    },

    handlePauseFile(fileId) {
        // input's value is not change the second time someone
        // inputs the same file again, therefore we need to reset its value
        this.refs.fileinput.getDOMNode().value = '';
        this.props.handlePauseFile(fileId);
    },

    handleResumeFile(fileId) {
        // input's value is not change the second time someone
        // inputs the same file again, therefore we need to reset its value
        this.refs.fileinput.getDOMNode().value = '';
        this.props.handleResumeFile(fileId);
    },

    handleOnClick() {
        // when multiple is set to false and the user already uploaded a piece,
        // do not propagate event
        if(this.props.dropzoneInactive) {
            return;
        }

        // Firefox only recognizes the simulated mouse click if bubbles is set to true,
        // but since Google Chrome propagates the event much further than needed, we
        // need to stop propagation as soon as the event is created
        var evt = new MouseEvent('click', {
            view: window,
            bubbles: true,
            cancelable: true
        });
        evt.stopPropagation();
        this.refs.fileinput.getDOMNode().dispatchEvent(evt);
    },

    render: function () {
        // has files only is true if there are files that do not have the status deleted or canceled
        let hasFiles = this.props.filesToUpload.filter((file) => file.status !== 'deleted' && file.status !== 'canceled' && file.size !== -1).length > 0;
        let className = hasFiles ? 'has-files ' : '';
        className += this.props.dropzoneInactive ? 'inactive-dropzone' : 'active-dropzone';
        className += this.props.className ? ' ' + this.props.className : '';

        return (
            <div
                className={className}
                onDragStart={this.handleDragStart}
                onDrag={this.handleDrop}
                onDragEnter={this.handleDragEnter}
                onDragLeave={this.handleDragLeave}
                onDragOver={this.handleDragOver}
                onDrop={this.handleDrop}
                onDragEnd={this.handleDragEnd}>
                    <FileDragAndDropDialog
                        multipleFiles={this.props.multiple}
                        hasFiles={hasFiles}
                        onClick={this.handleOnClick}/>
                    <FileDragAndDropPreviewIterator
                        files={this.props.filesToUpload}
                        handleDeleteFile={this.handleDeleteFile}
                        handleCancelFile={this.handleCancelFile}
                        handlePauseFile={this.handlePauseFile}
                        handleResumeFile={this.handleResumeFile}
                        areAssetsDownloadable={this.props.areAssetsDownloadable}
                        areAssetsEditable={this.props.areAssetsEditable}/>
                    <input
                        multiple={this.props.multiple}
                        ref="fileinput"
                        type="file"
                        style={{
                            display: 'none',
                            height: 0,
                            width: 0
                        }}
                        onChange={this.handleDrop} />
            </div>
      );
    }
});

export default FileDragAndDrop;