import { FlowStep } from "./FlowStep"
import Combine from "../Base/Combine"
import { Store } from "../../Logic/UIEventSource"
import LayerConfig from "../../Models/ThemeConfig/LayerConfig"
import { InputElement } from "../Input/InputElement"
import { AllKnownLayouts } from "../../Customizations/AllKnownLayouts"
import { FixedInputElement } from "../Input/FixedInputElement"
import Img from "../Base/Img"
import Title from "../Base/Title"
import { RadioButton } from "../Input/RadioButton"
import { And } from "../../Logic/Tags/And"
import { VariableUiElement } from "../Base/VariableUIElement"
import Toggleable from "../Base/Toggleable"
import { BBox } from "../../Logic/BBox"
import BaseUIElement from "../BaseUIElement"
import PresetConfig from "../../Models/ThemeConfig/PresetConfig"
import List from "../Base/List"
import Translations from "../i18n/Translations"

export default class SelectTheme
    extends Combine
    implements
        FlowStep<{
            features: any[]
            theme: string
            layer: LayerConfig
            bbox: BBox
        }>
{
    public readonly Value: Store<{
        features: any[]
        theme: string
        layer: LayerConfig
        bbox: BBox
    }>
    public readonly IsValid: Store<boolean>

    constructor(params: { features: any[]; layer: LayerConfig; bbox: BBox }) {
        const t = Translations.t.importHelper.selectTheme
        let options: InputElement<string>[] = Array.from(AllKnownLayouts.allKnownLayouts.values())
            .filter((th) => th.layers.some((l) => l.id === params.layer.id))
            .filter((th) => th.id !== "personal")
            .map(
                (th) =>
                    new FixedInputElement<string>(
                        new Combine([
                            new Img(th.icon).SetClass("block h-12 w-12 br-4"),
                            new Title(th.title),
                        ]).SetClass("flex items-center"),
                        th.id
                    )
            )

        const themeRadios = new RadioButton<string>(options, {
            selectFirstAsDefault: false,
        })

        const applicablePresets = themeRadios.GetValue().map((theme) => {
            if (theme === undefined) {
                return []
            }
            // we get the layer with the correct ID via the actual theme config, as the actual theme might have different presets due to overrides
            const themeConfig = AllKnownLayouts.allKnownLayouts.get(theme)
            const layer = themeConfig.layers.find((l) => l.id === params.layer.id)
            return layer.presets
        })

        const nonMatchedElements = applicablePresets.map((presets) => {
            if (presets === undefined || presets.length === 0) {
                return undefined
            }
            return params.features.filter(
                (feat) =>
                    !presets.some((preset) =>
                        new And(preset.tags).matchesProperties(feat.properties)
                    )
            )
        })

        super([
            new Title(t.title),
            t.intro,
            themeRadios,
            new VariableUiElement(
                applicablePresets.map(
                    (applicablePresets) => {
                        if (themeRadios.GetValue().data === undefined) {
                            return undefined
                        }
                        if (applicablePresets === undefined || applicablePresets.length === 0) {
                            return t.noMatchingPresets.SetClass("alert")
                        }
                    },
                    [themeRadios.GetValue()]
                )
            ),

            new VariableUiElement(
                nonMatchedElements.map(
                    (unmatched) =>
                        SelectTheme.nonMatchedElementsPanel(unmatched, applicablePresets.data),
                    [applicablePresets]
                )
            ),
        ])
        this.SetClass("flex flex-col")

        this.Value = themeRadios.GetValue().map((theme) => ({
            features: params.features,
            layer: params.layer,
            bbox: params.bbox,
            theme,
        }))

        this.IsValid = this.Value.map(
            (obj) => {
                if (obj === undefined) {
                    return false
                }
                if ([obj.theme, obj.features].some((v) => v === undefined)) {
                    return false
                }
                if (applicablePresets.data === undefined || applicablePresets.data.length === 0) {
                    return false
                }
                if ((nonMatchedElements.data?.length ?? 0) > 0) {
                    return false
                }

                return true
            },
            [applicablePresets]
        )
    }

    private static nonMatchedElementsPanel(
        unmatched: any[],
        applicablePresets: PresetConfig[]
    ): BaseUIElement {
        if (unmatched === undefined || unmatched.length === 0) {
            return
        }
        const t = Translations.t.importHelper.selectTheme

        const applicablePresetsOverview = applicablePresets.map((preset) =>
            t.needsTags
                .Subs({
                    title: preset.title,
                    tags: preset.tags.map((t) => t.asHumanString()).join(" & "),
                })
                .SetClass("thanks")
        )

        const unmatchedPanels: BaseUIElement[] = []
        for (const feat of unmatched) {
            const parts: BaseUIElement[] = []
            parts.push(
                new Combine(
                    Object.keys(feat.properties).map((k) => k + "=" + feat.properties[k])
                ).SetClass("flex flex-col")
            )

            for (const preset of applicablePresets) {
                const tags = new And(preset.tags).asChange({})
                const missing = []
                for (const { k, v } of tags) {
                    if (preset[k] === undefined) {
                        missing.push(t.missing.Subs({ k, v }))
                    } else if (feat.properties[k] !== v) {
                        missing.push(t.misMatch.Subs({ k, v, properties: feat.properties }))
                    }
                }

                if (missing.length > 0) {
                    parts.push(
                        new Combine([t.notApplicable.Subs(preset), new List(missing)]).SetClass(
                            "flex flex-col alert"
                        )
                    )
                }
            }

            unmatchedPanels.push(new Combine(parts).SetClass("flex flex-col"))
        }

        return new Combine([
            t.displayNonMatchingCount.Subs(unmatched).SetClass("alert"),
            ...applicablePresetsOverview,
            new Toggleable(new Title(t.unmatchedTitle), new Combine(unmatchedPanels)),
        ]).SetClass("flex flex-col")
    }
}