/* eslint-disable @typescript-eslint/no-explicit-any */
import ChartJS, { type ChartConfiguration } from 'chart.js/auto'
import { Color } from '../numbers'

export interface DatasetOptions {
    label: string
    color?: Color
}

export interface ChartConstructor {
    root: HTMLElement
    datasets: DatasetOptions[]
    axisLabels?: { x: string, y: string }
    title?: string
    width?: number
}

/**
 * Creates an X-Y scatter plot.
 */
export default class ScatterPlot {
    private chart: ChartJS<'scatter'>
    private width: number

    constructor(opts: ChartConstructor) {
        const axisLabels = opts.axisLabels ?? { x: 'time', y: 'Y' }
        const title = opts.title ?? 'Scatter Plot'

        this.width = opts.width ?? 400

        const canvas = document.createElement('canvas')
        const draggable = document.createElement('drag-pane')
        draggable.setAttribute('heading', title )
        draggable.setAttribute('key', title)
        draggable.appendChild(canvas)
        opts.root.appendChild(draggable)
        canvas.width = this.width

        const datasets = opts.datasets.map((dataset) => {
            const borderColor = dataset.color?.toRGB() ?? Color.fromName('blue').toRGB()
            return {
                label: dataset.label,
                data: [],
                backgroundColor: 'rgba(54, 162, 235, 0.2)',
                borderColor,
                borderWidth: 1
            }
        })

        const chartOptions: ChartConfiguration<'scatter'> = {
            type: 'scatter',
            data: {
                datasets
            },
            options: {
                scales: {
                    x: {
                        title: {
                            display: true,
                            text: axisLabels.x
                        }
                    },
                    y: {
                        title: {
                            display: true,
                            text: axisLabels.y
                        },
                        beginAtZero: true
                    }
                }
            }
        }

        this.chart = new ChartJS(canvas, chartOptions)
    }

    /**
     * Pushes an array of data point arrays to the chart.
     * 
     * The ith array of points corresponds to the ith dataset
     * defined for the chart.
     */
    public pushData(data: {x: number, y: number}[][]): void {
        // this.chart.data.datasets[0].data.push(...data)
        data.forEach( (data, index) => {
            this.chart.data.datasets[index].data.push(...data)
        })
        this.chart.update()
    }


}