<script>
import BaseComponent from 'primevue/basecomponent';
import { useStyle } from 'primevue/usestyle';

const styles = `
.p-dropdown {
    display: inline-flex;
    cursor: pointer;
    user-select: none;
}

.p-dropdown-clear-icon {
    position: absolute;
    top: 50%;
    margin-top: -0.5rem;
}

.p-dropdown-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.p-dropdown-label {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    flex: 1 1 auto;
    width: 1%;
    text-overflow: ellipsis;
    cursor: pointer;
}

.p-dropdown-label-empty {
    overflow: hidden;
    opacity: 0;
}

input.p-dropdown-label {
    cursor: default;
}

.p-dropdown .p-dropdown-panel {
    min-width: 100%;
}

.p-dropdown-panel {
    position: absolute;
    top: 0;
    left: 0;
}

.p-dropdown-items-wrapper {
    overflow: auto;
}

.p-dropdown-item {
    cursor: pointer;
    font-weight: normal;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.p-dropdown-item-group {
    cursor: auto;
}

.p-dropdown-items {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

.p-dropdown-filter {
    width: 100%;
}

.p-dropdown-filter-container {
    position: relative;
}

.p-dropdown-filter-icon {
    position: absolute;
    top: 50%;
    margin-top: -0.5rem;
}

.p-fluid .p-dropdown {
    display: flex;
}

.p-fluid .p-dropdown .p-dropdown-label {
    width: 1%;
}
`;

const inlineStyles = {
    root: { position: 'relative' }
};

const classes = {
    root: ({ props, state }) => [
        'p-dropdown p-component p-inputwrapper',
        {
            'p-disabled': props.disabled,
            'p-dropdown-clearable': props.showClear && !props.disabled,
            'p-focus': state.focused,
            'p-inputwrapper-filled': props.hasSelectedOption,
            'p-inputwrapper-focus': state.focused || state.overlayVisible,
            'p-overlay-open': state.overlayVisible
        }
    ],
    input: ({ instance, props }) => [
        'p-dropdown-label p-inputtext',
        {
            'p-placeholder': !props.editable && instance.label === props.placeholder,
            'p-dropdown-label-empty': !props.editable && !instance.$slots['value'] && (instance.label === 'p-emptylabel' || instance.label.length === 0)
        }
    ],
    clearIcon: 'p-dropdown-clear-icon',
    trigger: 'p-dropdown-trigger',
    loadingicon: 'p-dropdown-trigger-icon',
    dropdownIcon: 'p-dropdown-trigger-icon',
    panel: ({ instance }) => [
        'p-dropdown-panel p-component',
        {
            'p-input-filled': instance.$primevue.config.inputStyle === 'filled',
            'p-ripple-disabled': instance.$primevue.config.ripple === false
        }
    ],
    hiddenFirstFocusableEl: 'p-hidden-accessible p-hidden-focusable',
    header: 'p-dropdown-header',
    filterContainer: 'p-dropdown-filter-container',
    filterInput: 'p-dropdown-filter p-inputtext p-component',
    filterIcon: 'p-dropdown-filter-icon',
    hiddenFilterResult: 'p-hidden-accessible',
    wrapper: 'p-dropdown-items-wrapper',
    list: 'p-dropdown-items',
    itemGroup: 'p-dropdown-item-group',
    item: ({ instance, state, option, focusedOption }) => [
        'p-dropdown-item',
        {
            'p-highlight': instance.isSelected(option),
            'p-focus': state.focusedOptionIndex === focusedOption,
            'p-disabled': instance.isOptionDisabled(option)
        }
    ],
    emptyMessage: 'p-dropdown-empty-message',
    hiddenEmptyMessage: 'p-hidden-accessible',
    hiddenSelectedMessage: 'p-hidden-accessible',
    hiddenLastFocusableEl: 'p-hidden-accessible p-hidden-focusable'
};

const { load: loadStyle, unload: unloadStyle } = useStyle(styles, { id: 'primevue_dropdown_style', manual: true });

export default {
    name: 'BaseDropdown',
    extends: BaseComponent,
    props: {
        modelValue: null,
        options: Array,
        optionLabel: null,
        optionValue: null,
        optionDisabled: null,
        optionGroupLabel: null,
        optionGroupChildren: null,
        scrollHeight: {
            type: String,
            default: '200px'
        },
        filter: Boolean,
        filterPlaceholder: String,
        filterLocale: String,
        filterMatchMode: {
            type: String,
            default: 'contains'
        },
        filterFields: {
            type: Array,
            default: null
        },
        editable: Boolean,
        placeholder: {
            type: String,
            default: null
        },
        disabled: {
            type: Boolean,
            default: false
        },
        dataKey: null,
        showClear: {
            type: Boolean,
            default: false
        },
        inputId: {
            type: String,
            default: null
        },
        inputClass: {
            type: [String, Object],
            default: null
        },
        inputStyle: {
            type: Object,
            default: null
        },
        inputProps: {
            type: null,
            default: null
        },
        panelClass: {
            type: [String, Object],
            default: null
        },
        panelStyle: {
            type: Object,
            default: null
        },
        panelProps: {
            type: null,
            default: null
        },
        filterInputProps: {
            type: null,
            default: null
        },
        clearIconProps: {
            type: null,
            default: null
        },
        appendTo: {
            type: String,
            default: 'body'
        },
        loading: {
            type: Boolean,
            default: false
        },
        clearIcon: {
            type: String,
            default: undefined
        },
        dropdownIcon: {
            type: String,
            default: undefined
        },
        filterIcon: {
            type: String,
            default: undefined
        },
        loadingIcon: {
            type: String,
            default: undefined
        },
        resetFilterOnHide: {
            type: Boolean,
            default: false
        },
        virtualScrollerOptions: {
            type: Object,
            default: null
        },
        autoOptionFocus: {
            type: Boolean,
            default: true
        },
        autoFilterFocus: {
            type: Boolean,
            default: false
        },
        selectOnFocus: {
            type: Boolean,
            default: false
        },
        filterMessage: {
            type: String,
            default: null
        },
        selectionMessage: {
            type: String,
            default: null
        },
        emptySelectionMessage: {
            type: String,
            default: null
        },
        emptyFilterMessage: {
            type: String,
            default: null
        },
        emptyMessage: {
            type: String,
            default: null
        },
        tabindex: {
            type: Number,
            default: 0
        },
        'aria-label': {
            type: String,
            default: null
        },
        'aria-labelledby': {
            type: String,
            default: null
        }
    },
    css: {
        inlineStyles,
        classes
    },
    watch: {
        isUnstyled: {
            immediate: true,
            handler(newValue) {
                !newValue && loadStyle();
            }
        }
    }
};
</script>
