import ChartJs from "../Base/ChartJs";
import TagRenderingConfig from "../../Models/ThemeConfig/TagRenderingConfig";
import {ChartConfiguration} from 'chart.js';
import Combine from "../Base/Combine";
import {TagUtils} from "../../Logic/Tags/TagUtils";
import {Utils} from "../../Utils";
import {OsmFeature} from "../../Models/OsmFeature";

export interface TagRenderingChartOptions {

    groupToOtherCutoff?: 3 | number,
    sort?: boolean
}

export class StackedRenderingChart extends ChartJs {
    constructor(tr: TagRenderingConfig, features: (OsmFeature & { properties: { date: string } })[], options?: {
        period: "day" | "month",
        groupToOtherCutoff?: 3 | number
    }) {
        const {labels, data} = TagRenderingChart.extractDataAndLabels(tr, features, {
            sort: true,
            groupToOtherCutoff: options?.groupToOtherCutoff
        })
        if (labels === undefined || data === undefined) {
            throw ("No labels or data given...")
        }
        // labels: ["cyclofix", "buurtnatuur", ...]; data : [ ["cyclofix-changeset", "cyclofix-changeset", ...], ["buurtnatuur-cs", "buurtnatuur-cs"], ... ]

        
        for (let i = labels.length; i >= 0; i--) {
            if (data[i]?.length != 0) {
                continue
            }
            data.splice(i, 1)
            labels.splice(i, 1)

        }

        const datasets: { label: string /*themename*/, data: number[]/*counts per day*/, backgroundColor: string }[] = []
        const allDays = StackedRenderingChart.getAllDays(features)
        let trimmedDays = allDays.map(d => d.substr(0, d.indexOf("T")))

        if (options?.period === "month") {
            trimmedDays = trimmedDays.map(d => d.substr(0, 7))
        }
        trimmedDays = Utils.Dedup(trimmedDays)


        for (let i = 0; i < labels.length; i++) {
            const label = labels[i];
            const changesetsForTheme = data[i]
            const perDay: Record<string, OsmFeature[]> = {}
            for (const changeset of changesetsForTheme) {
                const csDate = new Date(changeset.properties.date)
                Utils.SetMidnight(csDate)
                let str = csDate.toISOString();
                if (options?.period === "month") {
                    csDate.setUTCDate(1)
                    str = csDate.toISOString().substr(0, 7);
                }
                if (perDay[str] === undefined) {
                    perDay[str] = [changeset]
                } else {
                    perDay[str].push(changeset)
                }
            }

            const countsPerDay: number[] = []
            for (let i = 0; i < trimmedDays.length; i++) {
                const day = trimmedDays[i];
                countsPerDay[i] = perDay[day]?.length ?? 0
            }
            let backgroundColor = TagRenderingChart.borderColors[i % TagRenderingChart.borderColors.length]
            if (label === "Unknown") {
                backgroundColor = TagRenderingChart.unkownBorderColor
            }
            if (label === "Other") {
                backgroundColor = TagRenderingChart.otherBorderColor
            }
            datasets.push({
                data: countsPerDay,
                backgroundColor,
                label
            })
        }




        const perDayData = {
            labels: trimmedDays,
            datasets
        }

        const config = <ChartConfiguration>{
            type: 'bar',
            data: perDayData,
            options: {
                responsive: true,
                legend: {
                    display: false
                },
                scales: {
                    x: {
                        stacked: true,
                    },
                    y: {
                        stacked: true
                    }
                }
            }
        }
        super(config)


    }

    public static getAllDays(features: (OsmFeature & { properties: { date: string } })[]): string[] {
        let earliest: Date = undefined
        let latest: Date = undefined;
        let allDates = new Set<string>();
        features.forEach((value, key) => {
            const d = new Date(value.properties.date);
            Utils.SetMidnight(d)

            if (earliest === undefined) {
                earliest = d
            } else if (d < earliest) {
                earliest = d
            }
            if (latest === undefined) {
                latest = d
            } else if (d > latest) {
                latest = d
            }
            allDates.add(d.toISOString())
        })

        while (earliest < latest) {
            earliest.setDate(earliest.getDate() + 1)
            allDates.add(earliest.toISOString())
        }
        const days = Array.from(allDates)
        days.sort()
        return days
    }
}

export default class TagRenderingChart extends Combine {

    public static readonly unkownColor = 'rgba(128, 128, 128, 0.2)'
    public static readonly unkownBorderColor = 'rgba(128, 128, 128, 0.2)'

    public static readonly otherColor = 'rgba(128, 128, 128, 0.2)'
    public static readonly otherBorderColor = 'rgba(128, 128, 255)'
    public static readonly notApplicableColor = 'rgba(128, 128, 128, 0.2)'
    public static readonly notApplicableBorderColor = 'rgba(255, 0, 0)'


    public static readonly backgroundColors = [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
    ]

    public static readonly borderColors = [
        'rgba(255, 99, 132, 1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
    ]

    /**
     * Creates a chart about this tagRendering for the given data
     */
    constructor(features: { properties: Record<string, string> }[], tagRendering: TagRenderingConfig, options?: TagRenderingChartOptions & {
        chartclasses?: string,
        chartstyle?: string,
        includeTitle?: boolean,
        chartType?: "pie" | "bar" | "doughnut"
    }) {
        if (tagRendering.mappings?.length === 0 && tagRendering.freeform?.key === undefined) {
            super([])
            this.SetClass("hidden")
            return;
        }

        const {labels, data} = TagRenderingChart.extractDataAndLabels(tagRendering, features, options)
        if (labels === undefined || data === undefined) {
            super([])
            this.SetClass("hidden")
            return
        }


        const borderColor = [TagRenderingChart.unkownBorderColor, TagRenderingChart.otherBorderColor, TagRenderingChart.notApplicableBorderColor]
        const backgroundColor = [TagRenderingChart.unkownColor, TagRenderingChart.otherColor, TagRenderingChart.notApplicableColor]


        while (borderColor.length < data.length) {
            borderColor.push(...TagRenderingChart.borderColors)
            backgroundColor.push(...TagRenderingChart.backgroundColors)
        }

        for (let i = data.length; i >= 0; i--) {
            if (data[i]?.length === 0) {
                labels.splice(i, 1)
                data.splice(i, 1)
                borderColor.splice(i, 1)
                backgroundColor.splice(i, 1)
            }
        }


        let barchartMode = tagRendering.multiAnswer;
        if (labels.length > 9) {
            barchartMode = true;
        }

        const config = <ChartConfiguration>{
            type: options.chartType ?? (barchartMode ? 'bar' : 'doughnut'),
            data: {
                labels,
                datasets: [{
                    data: data.map(l => l.length),
                    backgroundColor,
                    borderColor,
                    borderWidth: 1,
                    label: undefined
                }]
            },
            options: {
                plugins: {
                    legend: {
                        display: !barchartMode
                    }
                }
            }
        }

        const chart = new ChartJs(config).SetClass(options?.chartclasses ?? "w-32 h-32");

        if (options.chartstyle !== undefined) {
            chart.SetStyle(options.chartstyle)
        }


        super([
            options?.includeTitle ? (tagRendering.question.Clone() ?? tagRendering.id) : undefined,
            chart])

        this.SetClass("block")
    }


    public static extractDataAndLabels<T extends { properties: Record<string, string> }>(tagRendering: TagRenderingConfig, features: T[], options?: TagRenderingChartOptions): { labels: string[], data: T[][] } {
        const mappings = tagRendering.mappings ?? []

        options = options ?? {}
        let unknownCount: T[] = [];
        const categoryCounts: T[][] = mappings.map(_ => [])
        const otherCounts: Record<string, T[]> = {}
        let notApplicable: T[] = [];
        for (const feature of features) {
            const props = feature.properties
            if (tagRendering.condition !== undefined && !tagRendering.condition.matchesProperties(props)) {
                notApplicable.push(feature);
                continue;
            }

            if (!tagRendering.IsKnown(props)) {
                unknownCount.push(feature);
                continue;
            }
            let foundMatchingMapping = false;
            if (!tagRendering.multiAnswer) {
                for (let i = 0; i < mappings.length; i++) {
                    const mapping = mappings[i];
                    if (mapping.if.matchesProperties(props)) {
                        categoryCounts[i].push(feature)
                        foundMatchingMapping = true
                        break;
                    }
                }
            } else {
                for (let i = 0; i < mappings.length; i++) {
                    const mapping = mappings[i];
                    if (TagUtils.MatchesMultiAnswer(mapping.if, props)) {
                        categoryCounts[i].push(feature)
                        foundMatchingMapping = true
                    }
                }
            }
            if (!foundMatchingMapping) {
                if (tagRendering.freeform?.key !== undefined && props[tagRendering.freeform.key] !== undefined) {
                    const otherValue = props[tagRendering.freeform.key]
                    otherCounts[otherValue] = (otherCounts[otherValue] ?? [])
                    otherCounts[otherValue].push(feature)
                } else {
                    unknownCount.push(feature)
                }
            }
        }

        if (unknownCount.length + notApplicable.length === features.length) {
            console.log("Returning no label nor data: all features are unkown or notApplicable")
            return {labels: undefined, data: undefined}
        }

        let otherGrouped: T[] = [];
        const otherLabels: string[] = []
        const otherData: T[][] = []
        const sortedOtherCounts: [string, T[]][] = []
        for (const v in otherCounts) {
            sortedOtherCounts.push([v, otherCounts[v]]);
        }
        if (options?.sort) {
            sortedOtherCounts.sort((a, b) => b[1].length - a[1].length)
        }
        for (const [v, count] of sortedOtherCounts) {
            if (count.length >= (options.groupToOtherCutoff ?? 3)) {
                otherLabels.push(v)
                otherData.push(otherCounts[v])
            } else {
                otherGrouped.push(...count);
            }
        }


        const labels = ["Unknown", "Other", "Not applicable", ...mappings?.map(m => m.then.txt) ?? [], ...otherLabels]
        const data: T[][] = [unknownCount, otherGrouped, notApplicable, ...categoryCounts, ...otherData]

        return {labels, data}
    }

}