import type { Theme } from '@mui/material/styles/createTheme';
import type { ChartOptions } from 'chart.js';
import type { ILocationSettings } from '../../hooks/useLocationSettings';
import type { IPoint } from '../feature/FeatureView/FeatureMetrics/FeatureMetricsChart/createChartData';
import {
    formatDateHM,
    formatDateYMD,
    formatDateYMDHM,
} from '../../utils/formatDate';
import { formatTickValue } from 'component/common/Chart/formatTickValue';

const formatVariantEntry = (
    variant: [string, number],
    totalExposure: number,
) => {
    if (totalExposure === 0) return '';
    const [key, value] = variant;
    const percentage = Math.floor((Number(value) / totalExposure) * 100);
    return `${value} (${percentage}%) - ${key}`;
};

export const createPlaceholderBarChartOptions = (
    theme: Theme,
): ChartOptions<'bar'> => ({
    plugins: {
        legend: {
            position: 'top',
            labels: {
                color: theme.palette.text.primary,
                usePointStyle: true,
                pointStyle: 'none',
                boxHeight: 0,
                padding: 15,
                boxPadding: 5,
            },
        },

        tooltip: {
            enabled: false,
        },
    },
    responsive: true,
    maintainAspectRatio: false,
    scales: {
        x: {
            stacked: true,
            ticks: {
                display: false,
            },
            grid: {
                display: false,
            },
        },
        y: {
            stacked: true,
            ticks: {
                maxTicksLimit: 5,
                display: false,
            },
            grid: {
                drawBorder: false,
                color: theme.palette.divider,
            },
        },
    },
    elements: {
        bar: {
            borderRadius: 5,
        },
    },
    interaction: {
        mode: 'index',
        intersect: false,
    },
});

export const createBarChartOptions = (
    theme: Theme,
    hoursBack: number,
    locationSettings: ILocationSettings,
): ChartOptions<'bar'> => {
    const { responsive, elements, interaction, scales, maintainAspectRatio } =
        createPlaceholderBarChartOptions(theme);
    return {
        plugins: {
            legend: {
                position: 'bottom',
                labels: {
                    color: theme.palette.text.primary,
                    pointStyle: 'circle',
                    usePointStyle: true,
                    boxHeight: 6,
                    padding: 15,
                    boxPadding: 5,
                },
            },

            // required to avoid the highlight plugin highlighting empty annotation
            annotation: {
                clip: false,
                annotations: {},
            },
            tooltip: {
                backgroundColor: theme.palette.background.paper,
                titleColor: theme.palette.text.primary,
                bodyColor: theme.palette.text.primary,
                bodySpacing: 6,
                padding: {
                    top: 20,
                    bottom: 20,
                    left: 30,
                    right: 30,
                },
                borderColor: 'rgba(0, 0, 0, 0.05)',
                borderWidth: 3,
                usePointStyle: true,
                caretSize: 0,
                boxPadding: 10,
                callbacks: {
                    label: (item) => {
                        return `${item.formattedValue} - ${item.dataset.label}`;
                    },
                    afterLabel: (item) => {
                        const data = item.dataset.data[
                            item.dataIndex
                        ] as unknown as IPoint;

                        if (
                            item.dataset.label !== 'Exposed' ||
                            data.variants === undefined
                        ) {
                            return '';
                        }
                        const { disabled, ...actualVariants } = data.variants;
                        return Object.entries(actualVariants)
                            .map((entry) => formatVariantEntry(entry, data.y))
                            .join('\n');
                    },
                    title: (items) => {
                        return `Time: ${
                            hoursBack > 48
                                ? formatDateYMDHM(
                                      items[0].label,
                                      locationSettings.locale,
                                      'UTC',
                                  )
                                : formatDateHM(
                                      items[0].label,
                                      locationSettings.locale,
                                  )
                        }`;
                    },
                },
            },
        },
        responsive,
        maintainAspectRatio,
        scales: {
            x: {
                ...(scales ? scales.x : {}),
                ticks: {
                    color: theme.palette.text.secondary,
                    callback(tickValue) {
                        const label = this.getLabelForValue(Number(tickValue));
                        return hoursBack > 48
                            ? formatDateYMD(
                                  label,
                                  locationSettings.locale,
                                  'UTC',
                              )
                            : formatDateHM(label, locationSettings.locale);
                    },
                },
            },
            y: {
                ...(scales?.y ?? {}),
                ticks: {
                    ...(scales?.y?.ticks ?? {}),
                    color: theme.palette.text.secondary,
                    callback: formatTickValue,
                    display: true,
                },
            },
        },
        elements,
        interaction,
    };
};