/**
 * This file is part of the jps-like-websites lib
 * URL: https://git.labos.goip.de/chris/jpc-like-websites
 * @copyright by its creator Christian Martin 
 */

/**
 * A chained class that sets most of the stylings of an element
 * Attributes:
 *  _modifications: {Object}
 */
class Modifier {
    /**
     * @type {Map<string,string>} _modifications
     */
    _modifications;
    /**
     * @type {Array<string>}
     */
    _removeMods;
    /**
     * @type {Shape}
     */
    _shape;
    /**
     * @type {Sides} paddingValues
     */
    _paddingValues;

    constructor() {
        this._modifications = new Object();
        this._removeMods = [];
    }

    /**
     * Sets the modifications for widht and height to 100%. 
     * @returns {Modifier} this modifier object
     */
    fillMaxSize(widthFraction = 1, heightFraction = 1) {
        return this.fillMaxWidth(widthFraction)
            .fillMaxHeight(heightFraction);
    }

    /**
     * Sets the modification for width to the given fraction of 1 (default 1 := 100%).
     * @param {number} fraction 
     * @returns {Modifier} this modifier object
    */
    fillMaxWidth(fraction = 1) {
        this._modifications["width"] = (100 * fraction) + "%";
        this._modifications["max-width"] = (100 * fraction) + "%";
        return this;
    }

    /**
     * Sets the modification for height to the given fraction of 1 (default 1 := 100%).
     * @param {number} fraction 
     * @returns {Modifier} this modifier object
     */
    fillMaxHeight(fraction = 1) {
        this._modifications["height"] = (100 * fraction) + "%";
        this._modifications["max-height"] = (100 * fraction) + "%";
        return this;
    }

    /**
     * 
     * @param {string} keyWord weither 'height' or 'width' that will be adjusted and looked for
     * @param {Sides} parentalPadding 
     */
    _updateDimensionsBy(parentalPadding) {
        function updateDirection(keyWord, modifications, parentalAdjustment) {
            let refKeys = Object.keys(modifications)
                .filter(k => k.includes(keyWord));

            if (refKeys.length > 0) {
                for (let i = 0; i < refKeys.length; i++) {
                    let key = refKeys[i];
                    let value = modifications[key];

                    if (key.includes("calc")) {
                        console.log(
                            `Modifier._updateByParent... ${keyWord
                            } - unexpected value '${value
                            }' for '${key
                            }', skipping...`
                        );
                    } else {
                        let newValue = `calc(${value} - ${parentalAdjustment});`;
                        modifications[key] = newValue.trim();
                    }
                }
            }
            return modifications;
        }

        if (parentalPadding) {
            let pval = parentalPadding.getValues();
            if (pval["horizontal"] > 0) {
                this._modifications = updateDirection("width", this._modifications, pval["horizontal"]+parentalPadding._unit);
            }

            if (pval["vertical"] > 0) {
                this._modifications = updateDirection("height", this._modifications, pval["vertical"]+parentalPadding._unit);
            }
        }

        return this;
    }

    /**
     * Sets modifications according to the dimensions object.
     * @param {Dimensions} dimensions 
     * @returns {Modifier} this modifier object
     */
    dimensions(dimensions) {
        dimensions.toModifications()
            .forEach(kvpair => {
                this._modifications[kvpair.key] = kvpair.value;
            })
        return this;
    }

    /**
     * Sets the padding on all sides according to the given padding object. 
     * Currently the padding will always be set 
     * to the most recent padding/padding. 
     * @param {Sides} siding
     * @returns {Modifier} this modifier object
     */
    padding(siding) {
        this._paddingValues = siding;
        let keyToAdd = "";
        if (siding instanceof PaddingChain) {
            /* TODO what is this supposed to do */
        } else if (siding instanceof Sides) {
            keyToAdd = "padding-"
        }
        siding.toModifications()
            .forEach(kvpair => {
                this._modifications[keyToAdd + kvpair.key] = kvpair.value;
            })
        return this;
    }

    /**
     * Sets the margin on all sides according to the given siding object. 
     * Currently the margin will always be set 
     * to the most recent margin/siding. 
     * @param {Sides} siding 
     * @returns {Modifier} this modifier object
     */
    margin(siding) {
        let keyToAdd = "";
        if (siding instanceof Sides) {
            keyToAdd = "margin-"
        }

        siding.toModifications()
            .forEach(kvpair => {
                this._modifications[keyToAdd + kvpair.key] = kvpair.value;
            });
        return this;
    }

    /**
     * Sets the background-color as a rgb color.
     * @param {Color} color 
     * @returns {Modifier} this modifier object
     */
    background(color) {
        this._modifications["background-color"] = color.cssRGBString();
        return this;
    }

    /**
     * Sets the color as a rgb color.
     * @param {Color} color 
     * @returns {Modifier} this modifier object
     */
    color(color) {
        this._modifications["color"] = color.cssRGBString();
        return this;
    }

    /**
     * Adds the modifications of the given Modifier to current Modifier.
     * This is especailly used in the cases of extending existing/pre defined 
     * Components.
     * CAUTION matching existing modifications will be overwritten. 
     * @param modifier The "new" Modifier
     * @returns {Modifier} The "old/current" Modifier, 
     * extended with the modifications of the given Modifier.
     */
    join(modifier, modifications = {}) {
        var keys = Object.keys(modifier.ensureModifier()._modifications);
        for (let i = 0; i < keys.length; i++) {
            /* if (!this._modifications.hasOwnProperty(keys[i])) */
            this._modifications[keys[i]] = modifier.ensureModifier()._modifications[keys[i]];
        }
        let removeMods = modifier.ensureModifier()._removeMods;
        if (removeMods.length > 0) {
            for (let i = 0; i < removeMods.length; i++) {
                delete this._modifications[removeMods[i]];
            }
        }
        return this;
    }

    /**
     * 
     * @param {string} key a css style rule
     * @param {string} value the corresponding value to the css style rule
     * @returns {Modifier} this modifier object
     */
    setStyleRule(key, value) {
        this._modifications[key] = value;
        return this;
    }

    /**
     * 
     * @param {string} key 
     * @returns {Modifier} this modifier object 
     */
    removeStyleRule(key) {
        this._removeMods.push(key);
        if (Object.keys(this._modifications).includes(key)) {
            delete this._modifications[key];
        }
        return this;
    }

    /**
     * Sets a border line (with given linestyle) to all sides. 
     * If lineStyle is an array, the containing LineStyles, 
     * are applied in the order: [top, right, bottom, left].
     * If the border has a shape defined, 
     * this shape will override earlier shape definitions.
     * Otherwise existing shape definitions will be applied.
     * @param {Border} border the style of the border line
     * @returns {Modifier} this modifier object
     */
    border(border) {
        if (border._shape) {
            this.clip(border._shape);
        } else if (this._shape) {
            border._shape = this._shape;
        }
        border.toModifications()
            .forEach(e => this._modifications[e.key] = e.value);
        return this;
    }

    /**
     * 
     * @param {Shape} shape 
     * @returns {Modifier} 
     */
    clip(shape) {
        this._shape = shape;
        this._modifications["border-radius"] = shape.getOrderedValues().join(' ');
        return this;
    }

    /**
     * 
     * @param {number} size of width and height in pixels
     * @returns {DimensionsChain} 
     */
    linkDimensions(size = -1) {
        if (size === -1) {
            return new DimensionsChain(this);
        } else {
            return new DimensionsChain(this).all(size).ensureModifier()
        }
    }

    /**
     * 
     * @param {number} amount the padding for all four sides
     * @returns {PaddingChain} 
     */
    linkPadding(amount = -1) {
        if (amount === -1) {
            return new PaddingChain(this);
        } else {
            return new PaddingChain(this).all(amount);
        }
    }

    /**
     * 
     * @param {number} cornerRadius will create a rounded rectangle with the given cornerRadius
     * @returns {ShapeChain}
     */
    linkClip(cornerRadius = -1) {
        if (cornerRadius === -1) {
            return new ShapeChain(this);
        } else {
            return new ShapeChain(this).all(cornerRadius);
        }
    }

    /**
     * 
     * @param {number} borderWidth sets the width of all four border sides
     * @returns {BorderChain}
     */
    linkBorder(borderWidth = -1) {
        if (borderWidth === -1) {
            return new BorderChain(this);
        } else {
            return new BorderChain(this).width(borderWidth);
        }
    }

    /**
     * 
     * @returns {Modifier}
     */
    ensureModifier() {
        return this;
    }

}

class ChainableModifier extends Modifier {
    _component;

    constructor(component) {
        super();
        this._component = component;
    }

    /**
     * 
     * @returns {Component}
     */
    toComponent() {
        return this._component.modifier(this);
    }

    /**
     * 
     * @param {Component|Array<Component>} innerComponent 
     * @returns {Component} the parent Component
     */
    childContext(innerComponent) {
        return this._component
            .modifier(this)
            .childContext(innerComponent);
    }
}