/*
 * Copyright 2016 Palantir Technologies, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { AbstractPureComponent, DISPLAYNAME_PREFIX, Intent } from "../../common";
import * as Errors from "../../common/errors";

import type { HandleHtmlProps } from "./handleProps";
import { MultiSlider, MultiSliderHandle, type SliderBaseProps } from "./multiSlider";

export type NumberRange = [number, number];

enum RangeIndex {
    START = 0,
    END = 1,
}

export interface RangeSliderProps extends SliderBaseProps {
    /**
     * Range value of slider. Handles will be rendered at each position in the range.
     *
     * @default [0, 10]
     */
    value?: NumberRange;

    /** Callback invoked when the range value changes. */
    onChange?(value: NumberRange): void;

    /** Callback invoked when a handle is released. */
    onRelease?(value: NumberRange): void;

    /** HTML props to apply to the slider Handles */
    handleHtmlProps?: { start?: HandleHtmlProps; end?: HandleHtmlProps };
}

/**
 * Range slider component.
 *
 * @see https://blueprintjs.com/docs/#core/components/sliders.range-slider
 */
export class RangeSlider extends AbstractPureComponent<RangeSliderProps> {
    public static defaultProps: RangeSliderProps = {
        ...MultiSlider.defaultSliderProps,
        intent: Intent.PRIMARY,
        value: [0, 10],
    };

    public static displayName = `${DISPLAYNAME_PREFIX}.RangeSlider`;

    public render() {
        const { value, handleHtmlProps, ...props } = this.props;
        return (
            <MultiSlider {...props}>
                <MultiSliderHandle
                    value={value![RangeIndex.START]}
                    type="start"
                    intentAfter={props.intent}
                    htmlProps={handleHtmlProps?.start}
                />
                <MultiSliderHandle value={value![RangeIndex.END]} type="end" htmlProps={handleHtmlProps?.end} />
            </MultiSlider>
        );
    }

    protected validateProps(props: RangeSliderProps) {
        const { value } = props;
        if (value == null || value[RangeIndex.START] == null || value[RangeIndex.END] == null) {
            throw new Error(Errors.RANGESLIDER_NULL_VALUE);
        }
    }
}