/**
 * 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 
 */


/**
 * Represents the most basic and simple form of a Component.
 * It is mainly a collection of wrapper methods 
 * around the HTMLElement methods to make them chainable.
 * It serves as base for further functionallity extensions.
 * @property {Map<string, SStoreDefinition>} _style
 */
class Component extends StyleAndScriptStoringComponent {
    /**
     * @type {boolean}
     */
    #isCompel;
    /**
     * @type {WebTrinity}
     */
    _wenity;
    /**
     * @type {Array<any>}
     */
    _toRegister;
    /**
     * @type {boolean} 
     */
    _isContextMenu;


    /**
     * Initializes the component
     * @param {HTMLElement} element the base element
     * @param {Map<string,string>} attr Specific already known attributes
     */
    constructor(element, attr = {}) {
        super(element, attr);
        this.#isCompel = false;
        this._isContextMenu = false;

        this._modifier = new Modifier()
            .margin(new Sides().all(0));
        this._modifier._modifications['display'] = "flex";

        this._toRegister = [];
    }

    /**
     * Adds a class to classList via HTMLElement.classList.add() method.
     * Further collects rules in a property until generate is called.
     * 
     * @CAUGHTION implementation is not safe to use, ignoring extStore is recommended;
     * 
     * @todo difference between stylings and classes, extStore logic in combination with the Page.register... logic
     * 
     * @override
     * 
     * @param {string} styleClass (without the '.' in the front)
     * @param {string|Modifier|map<string,string>} styling
     * @param {ExtStorage|ExtStoreType|ExtStorePosition|OverwriteBehaviour|EXPosConfer|ESOverwriteConfer} extStore 
     * if a unique definition is desired, all constants or configurator objects are allowed - they will be processed accordingly 
     * @returns {Component} this component object
     */
    addStyleClass(styleClass, styling = null, extStore = null) {
        if (!extStore) {
            extStore = this._styleClassesExtStore;
        } else if (extStore.isMissing()) {
            extStore = extStore.fillBy(this._styleClassesExtStore);
        }

        if (styling) {
            if (styling instanceof Modifier) {
                styling = styling._modifications;
            }

            Page.registerStyling('.' + styleClass, styling);
        }

        this._element.classList.add(styleClass);

        return this;
    }

    /**
     * 
     * @param {boolean} vertical Defines if the Component should overflow vertically (default: true)
     * @param {boolean} horizontal Defines if the Component should overflow horizontally (default: false)
     * @returns {Component}
     */
    overflow(vertical = true, horizontal = false) {
        if (vertical) {
            this._modifier._modifications["overflow-y"] = "auto";
        }
        if (horizontal) {
            this._modifier._modifications["overflow-x"] = "auto";
        }
        return this;
    }


    /**
     * 
     * @param {boolean} untilFound
     * @returns {Component}
     */
    hidden(untilFound = false) {
        this._modifier.removeStyleRule("display");
        this.setAttribute(
            "hidden",
            (untilFound ? "until-found" : "hidden")
        );

        return this;
    }

    /**
     * 
     * @returns {Component}
     */
    isHigherComponent() {
        this.#isCompel = true;
        return this.setAttribute("data-compel-isHCompel", "true")
    }

    /**
     * Collects the given List in the _toRegister attribute.
     * When generate() is called, 
     * the created Element will be registered (added) in every list 
     * within the list. 
     * @param {Array} listName 
     */
    subscribeOnGenerate(listName) {
        this._toRegister.push(listName);
        return this;
    }

    /**
     * 
     * @returns {Component}
     */
    registerAsContextMenu() {
        this._isContextMenu = true;
        this.addStyleClass('contextmenu')
            .hidden();

        return this;
    }

    /**
     * @todo Positioning of the contextmenu element
     * @todo extract into an extra function(allity) provider
     * 
     * @param {Component} component 
     * @param {Function<HTMLElement|Event> => Sides} getRefPos 
     * @param {null|ExtStorage} [extStore=null] 
     * @returns {Component}
     */
    contextMenu(component, getRefPos = null, extStore = null) {
        if (!component._isContextMenu) {
            component.registerAsContextMenu();
        }
        if (!getRefPos) {
            getRefPos = function (cmEvent) {
                return new Sides()
                    .left(cmEvent.pageX)
                    .top(cmEvent.pageY);
            }
        }

        let cMenuWenity = component.generate();

        let identifier = cMenuWenity.html.getAttribute("data-autocompel");

        function hideCMenu(el) {
            el.setAttribute("hidden", "hidden");
            el.style.display = "none";
        }

        function hideOnEscape(event) {
            if (event.key === "Escape") {
                let menu = document.querySelector(`[data-autocompel="${identifier}"`);
                hideCMenu(menu);
                document.removeEventListener("keyup")
            }
        }


        function hideOnClickOutsideOfBounds(event) {
            let menu = document.querySelector(`[data-autocompel="${identifier}"`);

            let area = getEnclosingBounds(menu);

            if (!areXYInArea(area, event.clientX, event.clientY)) {
                //if (event.target.offsetParent != menu) {
                hideCMenu(menu);
                document.removeEventListener("click")
            }
        }

        this.addEventListener(
            "contextmenu",
            function (event) {
                event.preventDefault();

                /**
                 * @type {Sides}
                 */
                const pos = getRefPos(event);

                let menu = document.querySelector(`[data-autocompel="${identifier}"`);

                menu.style.left = `${pos.getByIndex(SideDirections.LEFT)}px`;
                menu.style.top = `${pos.getByIndex(SideDirections.TOP)}px`;

                menu.style["display"] = "block";
                menu.removeAttribute("hidden");
                document.addEventListener("click", hideOnClickOutsideOfBounds);
                document.addEventListener("keyup", hideOnEscape);
            }
        );

        return this;
    }

    /**
     * 
     * @param {*} dndGroup 
     * @returns {Component}
     */
    draggable(dndGroup = null) {
        let selector = this._element.getAttribute("data-autocompel");
        return this.addStyleClass("comp-el-mech-draggable")
            .setAttribute("draggable", "true")
            .setAttribute("dropEffect", "none")
            .addEventListener(
                CommonEvents.DRAG_START,
                function (event) {
                    console.log("DragEvent", event, "on", selector);
                    e.dataTransfer
                        .setData(
                            "text/plain",
                            selector
                        );
                }
            );
    }

    /**
     * 
     * @param {EventDrag} dragEvent 
     * @param {Function} action 
     */
    onDrag(dragEvent, action) {
        let selector = `comp-el-mech-drag${dragEvent}`;

        return this.addEventListener(
            dragEvent,
            function (event) {
                event.preventDefault();
            }
        );
    }

    /**
     * 
     * @param {*} dndGroup 
     * @returns {Component}
     */
    dropTarget(dndGroup = null) {
        let selector = "comp-el-mech-droptarget";
        return this.onDrag(EventDrag.OVER)
            .addStyleClass(selector)
            .addEventListener(
                CommonEvents.DROP,
                function (event) {
                    event.preventDefault();

                    let draggedKey = event.dataTransfer.getData("text");
                    let draggedElement = document.querySelector(`[data-autocompel="${draggedKey}"]`);

                    let target = e.target
                        .closest('.' + selector);

                    if (![...target.childNodes].includes(draggedElement)) {
                        target
                            .appendChild(draggedElement);
                    }
                }
            );
    }

    /**
     * Defines how a child Component is to be appended.
     * @param {Component} component the child component to add it.
     * @returns {HTMLElement}
     */
    _appendChildComponent(component) {
        let child = new WebTrinity();
        if (component instanceof Component) {
            child = component.generate();
        }

        if (component instanceof WebTrinity) {
            child = component;
        }

        if (component instanceof HTMLElement) {
            console.log("No wenity set - htmlEl was given");
            child.html = component;
        }

        this._element.append(child.html);

        return child;
    }


    _processStyles(extStore = null) {
        if (!extStore) {
            extStore = this._stylesExtStore.updateForGeneralStyling();
        } else {
            extStore.updateForGeneralStyling();
        }

        /**
         * @todo very likely code dupplication - but kept for the time being
         *          for error tracking. 
         */
        if (extStore._type === ExtStoreType.INTERNALIZED_WITHIN) {
            let sizings = Object.keys(this._modifier._modifications)
                .filter(e => e.includes("width") || e.includes("height"))
                .filter(e => this._modifier._modifications[e].includes("calc"))
                .reduce((a, c) => a.add(
                    c,
                    this._modifier
                        ._modifications[c]
                        .split('(')[1]
                        .split(' - ')[0]
                ), new ObjectAccessObject());

            fillAttrsInContainerByCb(
                this._modifier._modifications,
                this._element,
                (key, val, el) => { el.style[key] = val; }
            );

            let hasElSizing = sizings.keys.some(k => Object.keys(this._element.style).includes(k));
            if (sizings.keys.length > 0 && !hasElSizing) {
                console.log("Fixing sizing - because not supported 'calc'", sizings);

                fillAttrsInContainerByCb(
                    sizings,
                    this._element,
                    (key, val, el) => { el.style[key] = val; }
                );
            }

        } else {
            /* ADDS ELEMENT MODIFIER TO this._styles list for styles processing */
            let modifierSSD = new SStoreDefinition();
            modifierSSD._identifier = "." + this._compName;
            modifierSSD._definition = this._modifier._modifications;
            modifierSSD._extStore = extStore;
            this._styles.unshift(modifierSSD);
        }

        let forCollection = [];

        let counter = 0;
        for (let i = 0; i < this._styles.length; i++) {
            const ssd = this._styles[i];
            /* Make sure that the type is unified for later processing */
            if (ssd._definition instanceof Modifier) {
                ssd._definition = ssd._definition._modifications;
            }

            /* Check/Ensure proper ExtStorageType for following comparison */
            let refESType = (
                ssd._extStore && ssd._extStore._type
                    ? ssd._extStore.updateForGeneralStyling()._type
                    : extStore._type
            );

            switch (refESType) {

                case ExtStoreType.INTERNALIZED_WITHIN:
                    fillAttrsInContainerByCb(
                        ssd._definition,
                        this._element,
                        (key, val, el) => { el.style[key] = val; }
                    )
                    break;

                case ExtStoreType.INDIVIDUALLY_DOC_HEAD:
                    let container = generateAndFillStyleTag([ssd]);
                    container.setAttribute("data-compel-individually-nr", counter++);
                    Page.addElementToPage(container, refESType);
                    break;

                case ExtStoreType.COLLECTED_DOC_HEAD:
                    forCollection.push(ssd);
                    break;

                case ExtStoreType.CENTRALIZED_DOC_HEAD:
                    Page.registerStyling(ssd._identifier, ssd._definition);
                    break;
            }
        }

        return forCollection;
    }


    _processFunctions(extStore = null) {
        if (!extStore) {
            extStore = this._functionsExtStore.updateForFunctions();
        } else {
            extStore.updateForFunctions();
        }

        const forCollection = new Map();
        const collectForBefore = [];

        let counter = 0;
        for (let i = 0; i < this._functions.length; i++) {
            const ssd = this._functions[i];
            /* Make sure that the type is unified for later processing */

            let refESType = (
                ssd._extStore && ssd._extStore._type
                    ? ssd._extStore.updateForFunctions()._type
                    : extStore._type
            );

            switch (refESType) {
                case ExtStoreType.CENTRALIZED_DOC_HEAD:
                case ExtStoreType.CENTRALIZED_SEGMENT_BEGIN:
                case ExtStoreType.CENTRALIZED_DOC_FOOTER:
                    Page.registerPageFunction(ssd._identifier, ssd._definition);
                    break;

                case ExtStoreType.INDIVIDUALLY_WITHIN:
                case ExtStoreType.INDIVIDUALLY_BEFORE:
                case ExtStoreType.INDIVIDUALLY_SEGMENT_BEGIN:
                case ExtStoreType.INDIVIDUALLY_DOC_FOOTER:
                case ExtStoreType.INDIVIDUALLY_DOC_HEAD:

                    let container = document.createElement("script");
                    container.setAttribute("data-compel-individually-nr", counter++);
                    container.innerText += getScriptTagInjectionText(
                        clearFunctionDeclarationText(ssd._definition),
                        ssd._identifier
                    );
                    Page.addElementToPage(container, refESType, this._element);

                    break;

                case ExtStoreType.COLLECTED_BEFORE:
                    collectForBefore.push(ssd);
                    break;

                case ExtStoreType.COLLECTED_SEGMENT_BEGIN:
                case ExtStoreType.COLLECTED_DOC_FOOTER:
                case ExtStoreType.COLLECTED_DOC_HEAD:
                    if (!forCollection.has(refESType)) {
                        forCollection.set(refESType, []);
                    }
                    forCollection.get(refESType).push(ssd);
                    break;
            }
        }

        return forCollection;
    }

    /**
     * Ends chain. 
     * Applies all modifications on the element.
     * Processes alls stored additions.
     * Returns the constructed HTMLElement of this Component.
     *
     * 
     * 
     * @param {ExtStorage} 
     * @returns {WebTrinity} the constructed HTMLElement of this Component.
     */
    generate(styleStore = null, functionStore = null) {
        this._wenity = new WebTrinity();

        /* DEAL WITH COMPONENT MODIFICATION FIRST */
        this._modifier._modifications["box-sizing"] = "border-box";
        this._modifier._modifications["justify-content"] = this._arrangement;
        this._modifier._modifications["align-content"] = this._alignment;
        this._modifier._modifications["align-items"] = this._alignment;
        this._modifier._modifications["text-align"] = this._alignment;


        let collectedWenities = [];

        for (let i = 0; i < this._children.length; i++) {
            /**
             * @type {Component}
             */
            let child = this._children[i];

            if (child instanceof ChainableModifier) {
                child = child.toComponent();
            }

            if (Page._useCssCalc) {
                child._modifier._updateDimensionsBy(this._modifier._paddingValues);
            }
            child = child.generate();

            let wenity = this._appendChildComponent(child);

            if (!wenity.isSSEmpty()) {
                collectedWenities.push(wenity);
            }
        }

        /**
         * @type {Array<SStoreDefinition>}
         */
        let styleCollection = this._processStyles(styleStore);
        /**
         * @type {Map<ExtStoreType, Array<SStoreDefinition>>}
         */
        const funcCollections = this._processFunctions(functionStore);

        /**
         * 
         * @param {Map<ExtStoreType, Array<SStoreDefinition>>} source 
         * @param {Map<ExtStoreType, Array<SStoreDefinition>>} target 
         * @param {ExtStoreType} extStoreType 
         * @returns 
         */
        function transferCollectedFunctions(source, target, extStoreType) {
            if (source) {
                if (source.has(extStoreType)) {
                    if (funcCollections.has(extStoreType)) {
                        target.get(extStoreType)
                            .push(source.get(extStoreType))
                    } else {
                        target.set(
                            extStoreType,
                            source.get(extStoreType)
                        );
                    }
                }
            }

            return target;
        }

        function executeOnExtStoreTypeCollectedTriple(func) {
            return new Map([
                { [ExtStoreType.COLLECTED_SEGMENT_BEGIN]: func(ExtStoreType.COLLECTED_SEGMENT_BEGIN) },
                { [ExtStoreType.COLLECTED_DOC_HEAD]: func(ExtStoreType.COLLECTED_DOC_HEAD) },
                { [ExtStoreType.COLLECTED_DOC_FOOTER]: func(ExtStoreType.COLLECTED_DOC_FOOTER) }
            ]);
        }

        for (let i = 0; i < collectedWenities.length; i++) {
            const child = collectedWenities[i];
            if (child.js) {
                executeOnExtStoreTypeCollectedTriple(
                    (extstoretype) => transferCollectedFunctions(child.js, funcCollections, extstoretype)
                );
            }
        }
        if (this.#isCompel) {
            function dealCollected(map, extStoreType) {
                if (map.has(extStoreType)) {
                    let collectionScriptTag = generateAndFillScriptTag(map.get(extStoreType));
                    if (extStoreType === ExtStoreType.COLLECTED_SEGMENT_BEGIN) {
                        this._element.insertAdjacentElement(
                            "afterbegin",
                            generateAndFillScriptTag(segment)
                        );
                    } else {
                        Page.addElementToPage(
                            collectionScriptTag,
                            extStoreType
                        );
                    }
                }
            }
            executeOnExtStoreTypeCollectedTriple((est) => dealCollected(funcCollections, est));

        } else {
            this._wenity.js = funcCollections;
            this._wenity.css = styleCollection;
        }

        this._wenity.html = this._element;

        return this._wenity;
    }


}