<template>
    <ul class="p-cascadeselect-panel p-cascadeselect-items">
        <template v-for="(processedOption, index) of options" :key="getOptionLabelToRender(processedOption)">
            <li
                :id="getOptionId(processedOption)"
                :class="getOptionClass(processedOption)"
                role="treeitem"
                :aria-label="getOptionLabelToRender(processedOption)"
                :aria-selected="isOptionGroup(processedOption) ? undefined : isOptionSelected(processedOption)"
                :aria-expanded="isOptionGroup(processedOption) ? isOptionActive(processedOption) : undefined"
                :aria-level="level + 1"
                :aria-setsize="options.length"
                :aria-posinset="index + 1"
            >
                <div v-ripple class="p-cascadeselect-item-content" @click="onOptionClick($event, processedOption)">
                    <component v-if="templates['option']" :is="templates['option']" :option="processedOption.option" />
                    <span v-else class="p-cascadeselect-item-text">{{ getOptionLabelToRender(processedOption) }}</span>
                    <slot v-if="isOptionGroup(processedOption)" name="optiongroupicon">
                        <component :is="templates['optiongroupicon'] ? templates['optiongroupicon'] : optionGroupIcon ? 'span' : 'AngleRightIcon'" :class="['p-cascadeselect-group-icon', optionGroupIcon]" aria-hidden="true" />
                    </slot>
                </div>
                <CascadeSelectSub
                    v-if="isOptionGroup(processedOption) && isOptionActive(processedOption)"
                    role="group"
                    class="p-cascadeselect-sublist"
                    :selectId="selectId"
                    :focusedOptionId="focusedOptionId"
                    :options="getOptionGroupChildren(processedOption)"
                    :activeOptionPath="activeOptionPath"
                    :level="level + 1"
                    :templates="templates"
                    :optionLabel="optionLabel"
                    :optionValue="optionValue"
                    :optionDisabled="optionDisabled"
                    :optionGroupIcon="optionGroupIcon"
                    :optionGroupLabel="optionGroupLabel"
                    :optionGroupChildren="optionGroupChildren"
                    @option-change="onOptionChange"
                />
            </li>
        </template>
    </ul>
</template>

<script>
import AngleRightIcon from 'primevue/icon/angleright';
import Ripple from 'primevue/ripple';
import { DomHandler, ObjectUtils } from 'primevue/utils';

export default {
    name: 'CascadeSelectSub',
    emits: ['option-change'],
    props: {
        selectId: String,
        focusedOptionId: String,
        options: Array,
        optionLabel: String,
        optionValue: String,
        optionDisabled: null,
        optionGroupIcon: String,
        optionGroupLabel: String,
        optionGroupChildren: Array,
        activeOptionPath: Array,
        level: Number,
        templates: null
    },
    mounted() {
        if (ObjectUtils.isNotEmpty(this.parentKey)) {
            this.position();
        }
    },
    methods: {
        getOptionId(processedOption) {
            return `${this.selectId}_${processedOption.key}`;
        },
        getOptionLabel(processedOption) {
            return this.optionLabel ? ObjectUtils.resolveFieldData(processedOption.option, this.optionLabel) : processedOption.option;
        },
        getOptionValue(processedOption) {
            return this.optionValue ? ObjectUtils.resolveFieldData(processedOption.option, this.optionValue) : processedOption.option;
        },
        isOptionDisabled(processedOption) {
            return this.optionDisabled ? ObjectUtils.resolveFieldData(processedOption.option, this.optionDisabled) : false;
        },
        getOptionGroupLabel(processedOption) {
            return this.optionGroupLabel ? ObjectUtils.resolveFieldData(processedOption.option, this.optionGroupLabel) : null;
        },
        getOptionGroupChildren(processedOption) {
            return processedOption.children;
        },
        isOptionGroup(processedOption) {
            return ObjectUtils.isNotEmpty(processedOption.children);
        },
        isOptionSelected(processedOption) {
            return !this.isOptionGroup(processedOption) && this.isOptionActive(processedOption);
        },
        isOptionActive(processedOption) {
            return this.activeOptionPath.some((path) => path.key === processedOption.key);
        },
        isOptionFocused(processedOption) {
            return this.focusedOptionId === this.getOptionId(processedOption);
        },
        getOptionLabelToRender(processedOption) {
            return this.isOptionGroup(processedOption) ? this.getOptionGroupLabel(processedOption) : this.getOptionLabel(processedOption);
        },
        onOptionClick(event, processedOption) {
            this.$emit('option-change', { originalEvent: event, processedOption, isFocus: true });
        },
        onOptionChange(event) {
            this.$emit('option-change', event);
        },
        position() {
            const parentItem = this.$el.parentElement;
            const containerOffset = DomHandler.getOffset(parentItem);
            const viewport = DomHandler.getViewport();
            const sublistWidth = this.$el.offsetParent ? this.$el.offsetWidth : DomHandler.getHiddenElementOuterWidth(this.$el);
            const itemOuterWidth = DomHandler.getOuterWidth(parentItem.children[0]);

            if (parseInt(containerOffset.left, 10) + itemOuterWidth + sublistWidth > viewport.width - DomHandler.calculateScrollbarWidth()) {
                this.$el.style.left = '-100%';
            }
        },
        getOptionClass(processedOption) {
            return [
                'p-cascadeselect-item',
                {
                    'p-cascadeselect-item-group': this.isOptionGroup(processedOption),
                    'p-cascadeselect-item-active p-highlight': this.isOptionActive(processedOption),
                    'p-focus': this.isOptionFocused(processedOption),
                    'p-disabled': this.isOptionDisabled(processedOption)
                }
            ];
        }
    },
    directives: {
        ripple: Ripple
    },
    components: {
        AngleRightIcon: AngleRightIcon
    }
};
</script>
