import { Utils } from "../../Utils"
import { FixedInputElement } from "../Input/FixedInputElement"
import { RadioButton } from "../Input/RadioButton"
import { VariableUiElement } from "../Base/VariableUIElement"
import Toggle, { ClickableToggle } from "../Input/Toggle"
import Combine from "../Base/Combine"
import Translations from "../i18n/Translations"
import { Translation } from "../i18n/Translation"
import Svg from "../../Svg"
import { ImmutableStore, Store, UIEventSource } from "../../Logic/UIEventSource"
import BaseUIElement from "../BaseUIElement"
import FilteredLayer, { FilterState } from "../../Models/FilteredLayer"
import BackgroundSelector from "./BackgroundSelector"
import FilterConfig from "../../Models/ThemeConfig/FilterConfig"
import TilesourceConfig from "../../Models/ThemeConfig/TilesourceConfig"
import { SubstitutedTranslation } from "../SubstitutedTranslation"
import ValidatedTextField from "../Input/ValidatedTextField"
import { QueryParameters } from "../../Logic/Web/QueryParameters"
import { TagUtils } from "../../Logic/Tags/TagUtils"
import { InputElement } from "../Input/InputElement"
import { DropDown } from "../Input/DropDown"
import { FixedUiElement } from "../Base/FixedUiElement"
import BaseLayer from "../../Models/BaseLayer"
import Loc from "../../Models/Loc"

export default class FilterView extends VariableUiElement {
    constructor(
        filteredLayer: Store<FilteredLayer[]>,
        tileLayers: { config: TilesourceConfig; isDisplayed: UIEventSource<boolean> }[],
        state: {
            availableBackgroundLayers?: Store<BaseLayer[]>
            featureSwitchBackgroundSelection?: UIEventSource<boolean>
            featureSwitchIsDebugging?: UIEventSource<boolean>
            locationControl?: UIEventSource<Loc>
        }
    ) {
        const backgroundSelector = new Toggle(
            new BackgroundSelector(state),
            undefined,
            state.featureSwitchBackgroundSelection ?? new ImmutableStore(false)
        )
        super(
            filteredLayer.map((filteredLayers) => {
                // Create the views which toggle layers (and filters them) ...
                let elements = filteredLayers
                    ?.map((l) =>
                        FilterView.createOneFilteredLayerElement(l, state)?.SetClass("filter-panel")
                    )
                    ?.filter((l) => l !== undefined)
                elements[0].SetClass("first-filter-panel")

                // ... create views for non-interactive layers ...
                elements = elements.concat(
                    tileLayers.map((tl) => FilterView.createOverlayToggle(state, tl))
                )
                // ... and add the dropdown to select a different background
                return elements.concat(backgroundSelector)
            })
        )
    }

    private static createOverlayToggle(
        state: { locationControl?: UIEventSource<Loc> },
        config: { config: TilesourceConfig; isDisplayed: UIEventSource<boolean> }
    ) {
        const iconStyle = "width:1.5rem;height:1.5rem;margin-left:1.25rem;flex-shrink: 0;"

        const icon = new Combine([Svg.checkbox_filled]).SetStyle(iconStyle)
        const iconUnselected = new Combine([Svg.checkbox_empty]).SetStyle(iconStyle)
        const name: Translation = config.config.name

        const styledNameChecked = name.Clone().SetStyle("font-size:large").SetClass("ml-2")
        const styledNameUnChecked = name.Clone().SetStyle("font-size:large").SetClass("ml-2")

        const zoomStatus = new Toggle(
            undefined,
            Translations.t.general.layerSelection.zoomInToSeeThisLayer
                .SetClass("alert")
                .SetStyle("display: block ruby;width:min-content;"),
            state.locationControl?.map((location) => location.zoom >= config.config.minzoom) ??
                new ImmutableStore(false)
        )

        const style = "display:flex;align-items:center;padding:0.5rem 0;"
        const layerChecked = new Combine([icon, styledNameChecked, zoomStatus])
            .SetStyle(style)
            .onClick(() => config.isDisplayed.setData(false))

        const layerNotChecked = new Combine([iconUnselected, styledNameUnChecked])
            .SetStyle(style)
            .onClick(() => config.isDisplayed.setData(true))

        return new Toggle(layerChecked, layerNotChecked, config.isDisplayed)
    }

    private static createOneFilteredLayerElement(
        filteredLayer: FilteredLayer,
        state: { featureSwitchIsDebugging?: Store<boolean>; locationControl?: Store<Loc> }
    ) {
        if (filteredLayer.layerDef.name === undefined) {
            // Name is not defined: we hide this one
            return new Toggle(
                new FixedUiElement(filteredLayer?.layerDef?.id).SetClass("block"),
                undefined,
                state?.featureSwitchIsDebugging ?? new ImmutableStore(false)
            )
        }
        const iconStyle = "width:1.5rem;height:1.5rem;margin-left:1.25rem;flex-shrink: 0;"

        const icon = new Combine([Svg.checkbox_filled]).SetStyle(iconStyle)
        const layer = filteredLayer.layerDef

        const iconUnselected = new Combine([Svg.checkbox_empty]).SetStyle(iconStyle)

        const name: Translation = filteredLayer.layerDef.name.Clone()

        const styledNameChecked = name.Clone().SetStyle("font-size:large").SetClass("ml-3")

        const styledNameUnChecked = name.Clone().SetStyle("font-size:large").SetClass("ml-3")

        const zoomStatus = new Toggle(
            undefined,
            Translations.t.general.layerSelection.zoomInToSeeThisLayer
                .SetClass("alert")
                .SetStyle("display: block ruby;width:min-content;"),
            state?.locationControl?.map(
                (location) => location.zoom >= filteredLayer.layerDef.minzoom
            ) ?? new ImmutableStore(false)
        )

        const toggleClasses = "layer-toggle flex flex-wrap items-center pt-2 pb-2 px-0"
        const layerIcon = layer.defaultIcon()?.SetClass("flex-shrink-0 w-8 h-8 ml-2")
        const layerIconUnchecked = layer
            .defaultIcon()
            ?.SetClass("flex-shrink-0 opacity-50  w-8 h-8 ml-2")

        const layerChecked = new Combine([icon, layerIcon, styledNameChecked, zoomStatus])
            .SetClass(toggleClasses)
            .onClick(() => filteredLayer.isDisplayed.setData(false))

        const layerNotChecked = new Combine([
            iconUnselected,
            layerIconUnchecked,
            styledNameUnChecked,
        ])
            .SetClass(toggleClasses)
            .onClick(() => filteredLayer.isDisplayed.setData(true))

        const filterPanel: BaseUIElement = new LayerFilterPanel(state, filteredLayer)

        return new Toggle(
            new Combine([layerChecked, filterPanel]),
            layerNotChecked,
            filteredLayer.isDisplayed
        )
    }
}

export class LayerFilterPanel extends Combine {
    public constructor(state: any, flayer: FilteredLayer) {
        const layer = flayer.layerDef
        if (layer.filters.length === 0) {
            super([])
            return undefined
        }

        const toShow: BaseUIElement[] = []

        for (const filter of layer.filters) {
            const [ui, actualTags] = LayerFilterPanel.createFilter(state, filter)

            ui.SetClass("mt-1")
            toShow.push(ui)
            actualTags.addCallbackAndRun((tagsToFilterFor) => {
                flayer.appliedFilters.data.set(filter.id, tagsToFilterFor)
                flayer.appliedFilters.ping()
            })
            flayer.appliedFilters
                .map((dict) => dict.get(filter.id))
                .addCallbackAndRun((filters) => actualTags.setData(filters))
        }

        super(toShow)
        this.SetClass("flex flex-col p-2 ml-12 pl-1 pt-0 layer-filters")
    }

    // Filter which uses one or more textfields
    private static createFilterWithFields(
        state: any,
        filterConfig: FilterConfig
    ): [BaseUIElement, UIEventSource<FilterState>] {
        const filter = filterConfig.options[0]
        const mappings = new Map<string, BaseUIElement>()
        let allValid: Store<boolean> = new ImmutableStore(true)
        var allFields: InputElement<string>[] = []
        const properties = new UIEventSource<any>({})
        for (const { name, type } of filter.fields) {
            const value = QueryParameters.GetQueryParameter(
                "filter-" + filterConfig.id + "-" + name,
                "",
                "Value for filter " + filterConfig.id
            )

            const field = ValidatedTextField.ForType(type)
                .ConstructInputElement({
                    value,
                })
                .SetClass("inline-block")
            mappings.set(name, field)
            const stable = value.stabilized(250)
            stable.addCallbackAndRunD((v) => {
                properties.data[name] = v.toLowerCase()
                properties.ping()
            })
            allFields.push(field)
            allValid = allValid.map(
                (previous) => previous && field.IsValid(stable.data) && stable.data !== "",
                [stable]
            )
        }
        const tr = new SubstitutedTranslation(
            filter.question,
            new UIEventSource<any>({ id: filterConfig.id }),
            state,
            mappings
        )
        const trigger: Store<FilterState> = allValid.map(
            (isValid) => {
                if (!isValid) {
                    return undefined
                }
                const props = properties.data
                // Replace all the field occurences in the tags...
                const tagsSpec = Utils.WalkJson(filter.originalTagsSpec, (v) => {
                    if (typeof v !== "string") {
                        return v
                    }

                    for (const key in props) {
                        v = (<string>v).replace("{" + key + "}", props[key])
                    }

                    return v
                })
                const tagsFilter = TagUtils.Tag(tagsSpec)
                return {
                    currentFilter: tagsFilter,
                    state: JSON.stringify(props),
                }
            },
            [properties]
        )

        const settableFilter = new UIEventSource<FilterState>(undefined)
        trigger.addCallbackAndRun((state) => settableFilter.setData(state))
        settableFilter.addCallback((state) => {
            if (state === undefined) {
                // still initializing
                return
            }
            if (state.currentFilter === undefined) {
                allFields.forEach((f) => f.GetValue().setData(undefined))
            }
        })

        return [tr, settableFilter]
    }

    private static createCheckboxFilter(
        filterConfig: FilterConfig
    ): [BaseUIElement, UIEventSource<FilterState>] {
        let option = filterConfig.options[0]

        const icon = Svg.checkbox_filled_svg().SetClass("block mr-2 w-6")
        const iconUnselected = Svg.checkbox_empty_svg().SetClass("block mr-2 w-6")

        const toggle = new ClickableToggle(
            new Combine([icon, option.question.Clone().SetClass("block")]).SetClass("flex"),
            new Combine([iconUnselected, option.question.Clone().SetClass("block")]).SetClass(
                "flex"
            )
        )
            .ToggleOnClick()
            .SetClass("block m-1")

        return [
            toggle,
            toggle.isEnabled.sync(
                (enabled) =>
                    enabled
                        ? {
                              currentFilter: option.osmTags,
                              state: "true",
                          }
                        : undefined,
                [],
                (f) => f !== undefined
            ),
        ]
    }

    private static createMultiFilter(
        filterConfig: FilterConfig
    ): [BaseUIElement, UIEventSource<FilterState>] {
        let options = filterConfig.options

        const values: FilterState[] = options.map((f, i) => ({
            currentFilter: f.osmTags,
            state: i,
        }))
        let filterPicker: InputElement<number>

        if (options.length <= 6) {
            filterPicker = new RadioButton(
                options.map(
                    (option, i) =>
                        new FixedInputElement(option.question.Clone().SetClass("block"), i)
                ),
                {
                    dontStyle: true,
                }
            )
        } else {
            filterPicker = new DropDown(
                "",
                options.map((option, i) => ({
                    value: i,
                    shown: option.question.Clone(),
                }))
            )
        }

        return [
            filterPicker,
            filterPicker.GetValue().sync(
                (i) => values[i],
                [],
                (selected) => {
                    const v = selected?.state
                    if (v === undefined || typeof v === "string") {
                        return undefined
                    }
                    return v
                }
            ),
        ]
    }

    private static createFilter(
        state: {},
        filterConfig: FilterConfig
    ): [BaseUIElement, UIEventSource<FilterState>] {
        if (filterConfig.options[0].fields.length > 0) {
            return LayerFilterPanel.createFilterWithFields(state, filterConfig)
        }

        if (filterConfig.options.length === 1) {
            return LayerFilterPanel.createCheckboxFilter(filterConfig)
        }

        const filter = LayerFilterPanel.createMultiFilter(filterConfig)
        filter[0].SetClass("pl-2")
        return filter
    }
}