import {
    Selection,
    CenterLayout,
    shortcut,
    Widget,
    Controller,
    extend,
    createWidget,
    createWidgets,
    each,
    isFunction,
    isKey,
    isNotEmptyArray,
    createItems,
    isArray,
    remove,
    map,
    stripEL,
    makeArrayByArray,
    clone,
    deepClone,
    formatEL,
    isEmpty,
    concat,
    removeAt,
    deepContains,
    has,
    any,
    BehaviorFactory,
    Events
} from "@/core";
import { TextButton } from "../single";

/**
 * Created by GUY on 2015/6/26.
 * @class ButtonGroup
 * @extends Widget
 */

@shortcut()
export class ButtonGroup extends Widget {
    static xtype = "bi.button_group";

    static EVENT_CHANGE = "EVENT_CHANGE";
    
    static CHOOSE_TYPE_SINGLE = Selection.Single;
    static CHOOSE_TYPE_MULTI = Selection.Multi;
    static CHOOSE_TYPE_ALL = Selection.All;
    static CHOOSE_TYPE_NONE = Selection.None;
    static CHOOSE_TYPE_DEFAULT = Selection.Default;

    _defaultConfig() {
        return extend(super._defaultConfig(...arguments), {
            baseCls: "bi-button-group",
            behaviors: {},
            items: [],
            value: "",
            chooseType: Selection.Single,
            layouts: [
                {
                    type: CenterLayout.xtype,
                    hgap: 0,
                    vgap: 0,
                }
            ],
        });
    }

    render() {
        const { behaviors: optionsBehaviors, items: optionsItems, value } = this.options;
        const behaviors = {};
        each(optionsBehaviors, (key, rule) => {
            behaviors[key] = BehaviorFactory.createBehavior(key, {
                rule,
            });
        });
        this.behaviors = behaviors;
        const items = isFunction(optionsItems)
            ? this.__watch(optionsItems, (context, newValue) => {
                this.populate(newValue);
            })
            : optionsItems;
        this.populate(items);
        this.options.value = isFunction(value)
            ? this.__watch(value, (context, newValue) => {
                this.setValue(newValue);
            })
            : value;
        if (isKey(value) || isNotEmptyArray(value)) {
            this.setValue(value);
        }
    }

    _createBtns(items) {
        let btns;
        Widget.execWithContext(this, () => {
            btns = createWidgets(
                createItems(items, {
                    type: TextButton.xtype,
                })
            );
        });

        return btns;
    }

    _btnsCreator(items) {
        const args = Array.prototype.slice.call(arguments);
        const { chooseType } = this.options;
        const buttons = this._createBtns(items);
        args[0] = buttons;

        each(this.behaviors, (i, behavior) => {
            behavior.doBehavior(...args);
        });
        each(buttons, (i, btn) => {
            btn.on(Controller.EVENT_CHANGE, (...arg) => {
                const [type, value, obj] = arg;
                if (type === Events.CLICK) {
                    switch (chooseType) {
                    case ButtonGroup.CHOOSE_TYPE_SINGLE:
                        this.setValue(btn.getValue());
                        break;
                    case ButtonGroup.CHOOSE_TYPE_NONE:
                        this.setValue([]);
                        break;
                    default:
                        break;
                    }
                    this.fireEvent(Controller.EVENT_CHANGE, ...arg);
                    this.fireEvent(ButtonGroup.EVENT_CHANGE, value, obj);
                } else {
                    this.fireEvent(Controller.EVENT_CHANGE, ...arg);
                }
            });
            btn.on(Events.DESTROY, () => {
                remove(this.buttons, btn);
            });
        });

        return buttons;
    }

    _packageBtns(btns) {
        const { layouts: optionsLayouts } = this.options;
        const layouts = isArray(optionsLayouts) ? optionsLayouts : [optionsLayouts];
        for (let i = layouts.length - 1; i > 0; i--) {
            btns = map(btns, (k, it) =>
                extend({}, layouts[i], {
                    items: [
                        extend({}, layouts[i].el, {
                            el: it,
                        })
                    ],
                })
            );
        }

        return btns;
    }

    _packageSimpleItems(btns) {
        const { items } = this.options;

        return map(items, (i, item) => {
            if (stripEL(item) === item) {
                return btns[i];
            }

            return extend({}, item, {
                el: btns[i],
            });
        });
    }

    _packageItems(items, packBtns) {
        return createItems(makeArrayByArray(items, {}), clone(packBtns));
    }

    _packageLayout(items) {
        const { layouts } = this.options;
        const layout = deepClone(isArray(layouts) ? layouts[0] : layouts);

        let lay = formatEL(layout).el;
        while (lay && lay.items && !isEmpty(lay.items)) {
            lay = formatEL(lay.items[0]).el;
        }
        lay.items = items;

        return layout;
    }

    // 如果是一个简单的layout
    _isSimpleLayout() {
        const { layouts, items } = this.options;

        return isArray(layouts) ? layouts.length === 1 && !isArray(items[0]) : true;
    }

    doBehavior() {
        const args = Array.prototype.slice.call(arguments);
        args.unshift(this.buttons);
        each(this.behaviors, (i, behavior) => {
            behavior.doBehavior(...args);
        });
    }

    prependItems(items) {
        const btns = this._btnsCreator(...arguments);
        this.buttons = concat(btns, this.buttons);

        if (this._isSimpleLayout() && this.layouts && this.layouts.prependItems) {
            this.layouts.prependItems(btns);

            return;
        }

        items = this._packageItems(items, this._packageBtns(btns));
        this.layouts.prependItems(this._packageLayout(items).items);
    }

    addItems(items) {
        const btns = this._btnsCreator(...arguments);
        this.buttons = concat(this.buttons, btns);

        // 如果是一个简单的layout
        if (this._isSimpleLayout() && this.layouts && this.layouts.addItems) {
            this.layouts.addItems(btns);

            return;
        }

        items = this._packageItems(items, this._packageBtns(btns));
        this.layouts.addItems(this._packageLayout(items).items);
    }

    removeItemAt(indexes) {
        removeAt(this.buttons, indexes);
        this.layouts.removeItemAt(indexes);
    }

    removeItems(values) {
        values = isArray(values) ? values : [values];
        const deleted = [];
        each(this.buttons, (i, button) => {
            if (deepContains(values, button.getValue())) {
                deleted.push(i);
            }
        });
        removeAt(this.buttons, deleted);
        this.layouts.removeItemAt(deleted);
    }

    populate(items) {
        items = items || [];
        this.empty();
        this.options.items = items;

        this.buttons = this._btnsCreator(...arguments);
        if (this._isSimpleLayout()) {
            items = this._packageSimpleItems(this.buttons);
        } else {
            items = this._packageItems(items, this._packageBtns(this.buttons));
        }

        this.layouts = createWidget(extend({ element: this }, this._packageLayout(items)));
    }

    setNotSelectedValue(v) {
        v = isArray(v) ? v : [v];
        each(this.buttons, (i, item) => {
            if (deepContains(v, item.getValue())) {
                item.setSelected && item.setSelected(false);
            } else {
                item.setSelected && item.setSelected(true);
            }
        });
    }

    setEnabledValue(v) {
        v = isArray(v) ? v : [v];
        each(this.buttons, (i, item) => {
            if (deepContains(v, item.getValue())) {
                item.setEnable(true);
            } else {
                item.setEnable(false);
            }
        });
    }

    setValue(v) {
        v = isArray(v) ? v : [v];
        each(this.buttons, (i, item) => {
            if (deepContains(v, item.getValue())) {
                item.setSelected && item.setSelected(true);
            } else {
                item.setSelected && item.setSelected(false);
            }
        });
    }

    setValueMap(map) {
        map = map || {};
        each(this.buttons, (i, item) => {
            if (has(map, item.getValue())) {
                item.setSelected && item.setSelected(true);
            } else {
                item.setSelected && item.setSelected(false);
            }
        });
    }

    setAllSelected(v) {
        each(this.getAllButtons(), (i, btn) => {
            (btn.setSelected || btn.setAllSelected).apply(btn, [v]);
        });
    }

    getNotSelectedValue() {
        const v = [];
        each(this.buttons, (i, item) => {
            if (item.isEnabled() && !(item.isSelected && item.isSelected())) {
                v.push(item.getValue());
            }
        });

        return v;
    }

    getValue() {
        const v = [];
        each(this.buttons, (i, item) => {
            if (item.isEnabled() && item.isSelected && item.isSelected()) {
                v.push(item.getValue());
            }
        });

        return v;
    }

    getAllButtons() {
        return this.buttons;
    }

    getAllLeaves() {
        return this.buttons;
    }

    getSelectedButtons() {
        const btns = [];
        each(this.buttons, (i, item) => {
            if (item.isSelected && item.isSelected()) {
                btns.push(item);
            }
        });

        return btns;
    }

    getNotSelectedButtons() {
        const btns = [];
        each(this.buttons, (i, item) => {
            if (item.isSelected && !item.isSelected()) {
                btns.push(item);
            }
        });

        return btns;
    }

    getIndexByValue(value) {
        let index = -1;
        any(this.buttons, (i, item) => {
            if (item.isEnabled() && item.getValue() === value) {
                index = i;

                return true;
            }
        });

        return index;
    }

    getNodeById(id) {
        let node;
        any(this.buttons, (i, item) => {
            if (item.isEnabled() && item.options.id === id) {
                node = item;

                return true;
            }
        });

        return node;
    }

    getNodeByValue(value) {
        let node;
        any(this.buttons, (i, item) => {
            if (item.isEnabled() && item.getValue() === value) {
                node = item;

                return true;
            }
        });

        return node;
    }

    /**
     * 滚动到指定的节点
     */
    scrollToValue(value, scrollIntoViewOptions) {
        const node = this.getNodeByValue(value);
        if (node) {
            node.element[0].scrollIntoView(scrollIntoViewOptions);
        }
    }

    empty() {
        super.empty(arguments);
        this.options.items = [];
    }

    destroy() {
        super.destroy(arguments);
        this.options.items = [];
    }
}