<script lang="typescript">
    import { getContext } from "svelte";
    import { nightModeKey } from "./contextKeys";

    export let id: string;
    export let className = "";
    export let tooltip: string;

    export let onChange: (event: Event) => void;

    function extendClassName(className: string): string {
        return `btn ${className}`;
    }

    const nightMode = getContext(nightModeKey);

    let inputRef: HTMLInputElement;

    function delegateToInput() {
        inputRef.click();
    }
</script>

<style lang="scss">
    @use "ts/sass/button_mixins" as button;

    @import "ts/bootstrap/functions";
    @import "ts/bootstrap/variables";

    button {
        padding: 0;

        width: calc(var(--toolbar-size) - 0px);
        height: calc(var(--toolbar-size) - 0px);

        padding: 4px;
        overflow: hidden;
    }

    .btn-light {
        @include button.light-hover-active;

        background: content-box
                linear-gradient(217deg, rgba(255, 0, 0, 0.8), rgba(255, 0, 0, 0) 70.71%),
            content-box
                linear-gradient(127deg, rgba(0, 255, 0, 0.8), rgba(0, 255, 0, 0) 70.71%),
            content-box
                linear-gradient(336deg, rgba(0, 0, 255, 0.8), rgba(0, 0, 255, 0) 70.71%),
            border-box $light;
    }

    .btn-secondary {
        background: content-box
                linear-gradient(217deg, rgba(255, 0, 0, 0.8), rgba(255, 0, 0, 0) 70.71%),
            content-box
                linear-gradient(127deg, rgba(0, 255, 0, 0.8), rgba(0, 255, 0, 0) 70.71%),
            content-box
                linear-gradient(336deg, rgba(0, 0, 255, 0.8), rgba(0, 0, 255, 0) 70.71%),
            border-box $secondary;
    }

    input {
        display: inline-block;
        cursor: pointer;
        opacity: 0;
    }
</style>

<button
    tabindex="-1"
    {id}
    class={extendClassName(className)}
    class:btn-light={!nightMode}
    class:btn-secondary={nightMode}
    title={tooltip}
    on:click={delegateToInput}
    on:mousedown|preventDefault>
    <input bind:this={inputRef} type="color" on:change={onChange} />
</button>
