/* global xirkiPostMessageFields, WebFont */
var xirkiPostMessage = {

	/**
	 * The fields.
	 *
	 * @since 3.0.26
	 */
	fields: {},

	/**
	 * A collection of methods for the <style> tags.
	 *
	 * @since 3.0.26
	 */
	styleTag: {

		/**
		 * Add a <style> tag in <head> if it doesn't already exist.
		 *
		 * @since 3.0.26
		 * @param {string} id - The field-ID.
		 * @returns {void}
		 */
		add: function( id ) {
			if ( null === document.getElementById( 'xirki-postmessage-' + id ) || 'undefined' === typeof document.getElementById( 'xirki-postmessage-' + id ) ) {
				jQuery( 'head' ).append( '<style id="xirki-postmessage-' + id + '"></style>' );
			}
		},

		/**
		 * Add a <style> tag in <head> if it doesn't already exist,
		 * by calling the this.add method, and then add styles inside it.
		 *
		 * @since 3.0.26
		 * @param {string} id - The field-ID.
		 * @param {string} styles - The styles to add.
		 * @returns {void}
		 */
		addData: function( id, styles ) {
			xirkiPostMessage.styleTag.add( id );
			jQuery( '#xirki-postmessage-' + id ).text( styles );
		}
	},

	/**
	 * Common utilities.
	 *
	 * @since 3.0.26
	 */
	util: {

		/**
		 * Processes the value and applies any replacements and/or additions.
		 *
		 * @since 3.0.26
		 * @param {Object} output - The output (js_vars) argument.
		 * @param {mixed}  value - The value.
		 * @param {string} controlType - The control-type.
		 * @returns {string|false} - Returns false if value is excluded, otherwise a string.
		 */
		processValue: function( output, value ) {
			var self     = this,
				settings = window.parent.wp.customize.get(),
				excluded = false;

			if ( 'object' === typeof value ) {
				_.each( value, function( subValue, key ) {
					value[ key ] = self.processValue( output, subValue );
				} );
				return value;
			}
			output = _.defaults( output, {
				prefix: '',
				units: '',
				suffix: '',
				value_pattern: '$',
				pattern_replace: {},
				exclude: []
			} );

			if ( 1 <= output.exclude.length ) {
				_.each( output.exclude, function( exclusion ) {
					if ( value == exclusion ) {
						excluded = true;
					}
				} );
			}

			if ( excluded ) {
				return false;
			}

			value = output.value_pattern.replace( new RegExp( '\\$', 'g' ), value );
			_.each( output.pattern_replace, function( id, placeholder ) {
				if ( ! _.isUndefined( settings[ id ] ) ) {
					value = value.replace( placeholder, settings[ id ] );
				}
			} );
			return output.prefix + value + output.units + output.suffix;
		},

		/**
		 * Make sure urls are properly formatted for background-image properties.
		 *
		 * @since 3.0.26
		 * @param {string} url - The URL.
		 * @returns {string}
		 */
		backgroundImageValue: function( url ) {
			return ( -1 === url.indexOf( 'url(' ) ) ? 'url(' + url + ')' : url;
		}
	},

	/**
	 * A collection of utilities for CSS generation.
	 *
	 * @since 3.0.26
	 */
	css: {

		/**
		 * Generates the CSS from the output (js_vars) parameter.
		 *
		 * @since 3.0.26
		 * @param {Object} output - The output (js_vars) argument.
		 * @param {mixed}  value - The value.
		 * @param {string} controlType - The control-type.
		 * @returns {string}
		 */
		fromOutput: function( output, value, controlType ) {
			var styles      = '',
				xirkiParent = window.parent.xirki,
				googleFont  = '',
				mediaQuery  = false,
				processedValue;

			if ( output.js_callback && 'function' === typeof window[ output.js_callback ] ) {
				value = window[ output.js_callback[0] ]( value, output.js_callback[1] );
			}
			switch ( controlType ) {
				case 'xirki-typography':
					styles += output.element + '{';
					_.each( value, function( val, key ) {
						if ( output.choice && key !== output.choice ) {
							return;
						}
						processedValue = xirkiPostMessage.util.processValue( output, val );
						if ( false !== processedValue ) {
							styles += key + ':' + processedValue + ';';
						}
					} );
					styles += '}';

					// Check if this is a googlefont so that we may load it.
					if ( ! _.isUndefined( WebFont ) && value['font-family'] && 'google' === xirkiParent.util.webfonts.getFontType( value['font-family'] ) ) {

						// Calculate the googlefont params.
						googleFont = value['font-family'].replace( /\"/g, '&quot;' );
						if ( value.variant ) {
							if ( 'regular' === value.variant ) {
								googleFont += ':400';
							} else if ( 'italic' === value.variant ) {
								googleFont += ':400i';
							} else {
								googleFont += ':' + value.variant;
							}
						}
						googleFont += ':cyrillic,cyrillic-ext,devanagari,greek,greek-ext,khmer,latin,latin-ext,vietnamese,hebrew,arabic,bengali,gujarati,tamil,telugu,thai';
						WebFont.load( {
							google: {
								families: [ googleFont ]
							}
						} );
					}
					break;
				case 'xirki-background':
				case 'xirki-dimensions':
				case 'xirki-multicolor':
				case 'xirki-sortable':
					styles += output.element + '{';
					_.each( value, function( val, key ) {
						if ( output.choice && key !== output.choice ) {
							return;
						}
						if ( 'background-image' === key ) {
							val = xirkiPostMessage.util.backgroundImageValue( val );
						}

						processedValue = xirkiPostMessage.util.processValue( output, val );

						if ( false !== processedValue ) {

							// Mostly used for padding, margin & position properties.
							if ( output.property ) {
								styles += output.property;
								if ( '' !== output.property && ( 'top' === key || 'bottom' === key || 'left' === key || 'right' === key ) ) {
									styles += '-' + key;
								}
								styles += ':' + processedValue + ';';
							} else {
								styles += key + ':' + processedValue + ';';
							}
						}
					} );
					styles += '}';
					break;
				default:
					if ( 'xirki-image' === controlType ) {
						value = ( ! _.isUndefined( value.url ) ) ? xirkiPostMessage.util.backgroundImageValue( value.url ) : xirkiPostMessage.util.backgroundImageValue( value );
					}
					if ( _.isObject( value ) ) {
						styles += output.element + '{';
						_.each( value, function( val, key ) {
							if ( output.choice && key !== output.choice ) {
								return;
							}
							processedValue = xirkiPostMessage.util.processValue( output, val );
							if ( ! output.property ) {
								output.property = key;
							}
							if ( false !== processedValue ) {
								styles += output.property + ':' + processedValue + ';';
							}
						} );
						styles += '}';
					} else {
						processedValue = xirkiPostMessage.util.processValue( output, value );
						if ( false !== processedValue ) {
							styles += output.element + '{' + output.property + ':' + processedValue + ';}';
						}
					}
					break;
			}

			// Get the media-query.
			if ( output.media_query && 'string' === typeof output.media_query && ! _.isEmpty( output.media_query ) ) {
				mediaQuery = output.media_query;
				if ( -1 === mediaQuery.indexOf( '@media' ) ) {
					mediaQuery = '@media ' + mediaQuery;
				}
			}

			// If we have a media-query, add it and return.
			if ( mediaQuery ) {
				return mediaQuery + '{' + styles + '}';
			}

			// Return the styles.
			return styles;
		}
	},

	/**
	 * A collection of utilities to change the HTML in the document.
	 *
	 * @since 3.0.26
	 */
	html: {

		/**
		 * Modifies the HTML from the output (js_vars) parameter.
		 *
		 * @since 3.0.26
		 * @param {Object} output - The output (js_vars) argument.
		 * @param {mixed}  value - The value.
		 * @returns {string}
		 */
		fromOutput: function( output, value ) {

			if ( output.js_callback && 'function' === typeof window[ output.js_callback ] ) {
				value = window[ output.js_callback[0] ]( value, output.js_callback[1] );
			}

			if ( _.isObject( value ) || _.isArray( value ) ) {
				if ( ! output.choice ) {
					return;
				}
				_.each( value, function( val, key ) {
					if ( output.choice && key !== output.choice ) {
						return;
					}
					value = val;
				} );
			}
			value = xirkiPostMessage.util.processValue( output, value );

			if ( output.attr ) {
				jQuery( output.element ).attr( output.attr, value );
			} else {
				jQuery( output.element ).html( value );
			}
		}
	},

	/**
	 * A collection of utilities to allow toggling a CSS class.
	 *
	 * @since 3.0.26
	 */
	toggleClass: {

		/**
		 * Toggles a CSS class from the output (js_vars) parameter.
		 *
		 * @since 3.0.21
		 * @param {Object} output - The output (js_vars) argument.
		 * @param {mixed}  value - The value.
		 * @returns {string}
		 */
		fromOutput: function( output, value ) {
			if ( 'undefined' === typeof output.class || 'undefined' === typeof output.value ) {
				return;
			}
			if ( value === output.value && ! jQuery( output.element ).hasClass( output.class ) ) {
				jQuery( output.element ).addClass( output.class );
			} else {
				jQuery( output.element ).removeClass( output.class );
			}
		}
	}
};

jQuery( document ).ready( function() {

	_.each( xirkiPostMessageFields, function( field ) {
		wp.customize( field.settings, function( value ) {
			value.bind( function( newVal ) {
				var styles = '';
				_.each( field.js_vars, function( output ) {
					if ( ! output.function || 'undefined' === typeof xirkiPostMessage[ output.function ] ) {
						output.function = 'css';
					}
					if ( 'css' === output.function ) {
						styles += xirkiPostMessage.css.fromOutput( output, newVal, field.type );
					} else {
						xirkiPostMessage[ output.function ].fromOutput( output, newVal, field.type );
					}
				} );
				xirkiPostMessage.styleTag.addData( field.settings, styles );
			} );
		} );
	} );
} );
