import {VariableUiElement} from "../Base/VariableUIElement";
import Svg from "../../Svg";
import Combine from "../Base/Combine";
import {SubtleButton} from "../Base/SubtleButton";
import Translations from "../i18n/Translations";
import * as personal from "../../assets/themes/personal/personal.json"
import Constants from "../../Models/Constants";
import BaseUIElement from "../BaseUIElement";
import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig";
import {ImmutableStore, Store, Stores, UIEventSource} from "../../Logic/UIEventSource";
import Loc from "../../Models/Loc";
import {OsmConnection} from "../../Logic/Osm/OsmConnection";
import UserRelatedState from "../../Logic/State/UserRelatedState";
import Toggle from "../Input/Toggle";
import {Utils} from "../../Utils";
import Title from "../Base/Title";
import * as themeOverview from "../../assets/generated/theme_overview.json"
import {Translation} from "../i18n/Translation";
import {TextField} from "../Input/TextField";
import FilteredCombine from "../Base/FilteredCombine";
import Locale from "../i18n/Locale";


export default class MoreScreen extends Combine {

    private static readonly officialThemes: {
        id: string,
        icon: string,
        title: any,
        shortDescription: any,
        definition?: any,
        mustHaveLanguage?: boolean,
        hideFromOverview: boolean,
        keywors?: any[]
    }[] = themeOverview["default"];
    
    constructor(state: UserRelatedState & {
        locationControl?: UIEventSource<Loc>,
        layoutToUse?: LayoutConfig
    }, onMainScreen: boolean = false) {
        const tr = Translations.t.general.morescreen;
        let themeButtonStyle = ""
        let themeListStyle = ""
        if (onMainScreen) {
            themeButtonStyle = "h-32 min-h-32 max-h-32 overflow-ellipsis overflow-hidden"
            themeListStyle = "md:grid md:grid-flow-row md:grid-cols-2 lg:grid-cols-3 xl:grid-cols-g4 gap-4"
        }

        const search = new TextField({
            placeholder: tr.searchForATheme,
        })
        search.enterPressed.addCallbackD(searchTerm => {
            searchTerm = searchTerm.toLowerCase()
            if(searchTerm === "personal"){
                window.location.href = MoreScreen.createUrlFor({id: "personal"}, false, state).data
            }
            if(searchTerm === "bugs" || searchTerm === "issues") {
                window.location.href = "https://github.com/pietervdvn/MapComplete/issues"
            }
            if(searchTerm === "source") {
                window.location.href = "https://github.com/pietervdvn/MapComplete"
            }
            if(searchTerm === "docs") {
                window.location.href = "https://github.com/pietervdvn/MapComplete/tree/develop/Docs"
            }
            if(searchTerm === "osmcha" || searchTerm === "stats"){
                window.location.href = Utils.OsmChaLinkFor(7)
            }
            // Enter pressed -> search the first _official_ matchin theme and open it
            const publicTheme = MoreScreen.officialThemes.find(th => 
                th.hideFromOverview == false && 
                th.id !== "personal" &&
                MoreScreen.MatchesLayoutFunc(th)(searchTerm))
            if (publicTheme !== undefined) {
                window.location.href = MoreScreen.createUrlFor(publicTheme, false, state).data
            }
            const hiddenTheme = MoreScreen.officialThemes.find(th => 
                th.id !== "personal" &&
                MoreScreen.MatchesLayoutFunc(th)(searchTerm))
            if (hiddenTheme !== undefined) {
                window.location.href = MoreScreen.createUrlFor(hiddenTheme, false, state).data
            }
        })

        if (onMainScreen) {
            search.focus()
        }
        document.addEventListener("keydown", function (event) {
            if (event.ctrlKey && event.code === "KeyF") {
                search.focus()
                event.preventDefault();
            }
        });

        const searchBar = new Combine([Svg.search_svg().SetClass("w-8"), search.SetClass("mr-4 w-full")])
            .SetClass("flex rounded-full border-2 border-black items-center my-2 w-1/2")


        super([
            new Combine([searchBar]).SetClass("flex justify-center"),
            MoreScreen.createOfficialThemesList(state, themeButtonStyle, themeListStyle, search.GetValue()),
            MoreScreen.createPreviouslyVistedHiddenList(state, themeButtonStyle, themeListStyle, search.GetValue()),
            MoreScreen.createUnofficialThemeList(themeButtonStyle, state, themeListStyle, search.GetValue()),
            tr.streetcomplete.Clone().SetClass("block text-base mx-10 my-3 mb-10")
        ]);
    }

    private static NothingFound(search: UIEventSource<string>): BaseUIElement {
        const t = Translations.t.general.morescreen;
        return new Combine([
            new Title(t.noMatchingThemes, 5).SetClass("w-max font-bold"),
            new SubtleButton(Svg.search_disable_ui(), t.noSearch, {imgSize: "h-6"}).SetClass("h-12 w-max")
                .onClick(() => search.setData(""))
        ]).SetClass("flex flex-col items-center w-full")
    }

    private static createUrlFor(layout: { id: string, definition?: string },
                                isCustom: boolean,
                                state?: { locationControl?: UIEventSource<{ lat, lon, zoom }>, layoutToUse?: { id } }
    ): Store<string> {
        if (layout === undefined) {
            return undefined;
        }
        if (layout.id === undefined) {
            console.error("ID is undefined for layout", layout);
            return undefined;
        }

        if (layout.id === state?.layoutToUse?.id) {
            return undefined;
        }

        const currentLocation = state?.locationControl;

        let path = window.location.pathname;
        // Path starts with a '/' and contains everything, e.g. '/dir/dir/page.html'
        path = path.substr(0, path.lastIndexOf("/"));
        // Path will now contain '/dir/dir', or empty string in case of nothing
        if (path === "") {
            path = "."
        }

        let linkPrefix = `${path}/${layout.id.toLowerCase()}.html?`
        if (location.hostname === "localhost" || location.hostname === "127.0.0.1") {
            linkPrefix = `${path}/theme.html?layout=${layout.id}&`
        }

        if (isCustom) {
            linkPrefix = `${path}/theme.html?userlayout=${layout.id}&`
        }

        let hash = ""
        if (layout.definition !== undefined) {
            hash = "#" + btoa(JSON.stringify(layout.definition))
        }

        return currentLocation?.map(currentLocation => {
            const params = [
                ["z", currentLocation?.zoom],
                ["lat", currentLocation?.lat],
                ["lon", currentLocation?.lon]
            ].filter(part => part[1] !== undefined)
                .map(part => part[0] + "=" + part[1])
                .join("&")
            return `${linkPrefix}${params}${hash}`;
        }) ?? new ImmutableStore<string>(`${linkPrefix}`)


    }

    /**
     * Creates a button linking to the given theme
     * @private
     */
    public static createLinkButton(
        state: {
            locationControl?: UIEventSource<Loc>,
            layoutToUse?: LayoutConfig
        }, layout: {
            id: string,
            icon: string,
            title: any,
            shortDescription: any,
            definition?: any,
            mustHaveLanguage?: boolean
        }, isCustom: boolean = false
    ):
        BaseUIElement {

        const url = MoreScreen.createUrlFor(layout, isCustom, state)
        let content = new Combine([
            new Translation(layout.title, !isCustom && !layout.mustHaveLanguage ? "themes:" + layout.id + ".title" : undefined),
            new Translation(layout.shortDescription)?.SetClass("subtle") ?? "",
        ]).SetClass("overflow-hidden flex flex-col")
        
        if(state.layoutToUse === undefined){
            // Currently on the index screen: we style the buttons equally large
            content = new Combine([content]).SetClass("flex flex-col justify-center h-24")
        }
        
        return new SubtleButton(layout.icon, content, {url, newTab: false});
    }

    public static CreateProffessionalSerivesButton() {
        const t = Translations.t.professional.indexPage;
        return new Combine([
            new Title(t.hook, 4),
            t.hookMore,
            new SubtleButton(undefined, t.button, {url: "./professional.html"}),
        ]).SetClass("flex flex-col border border-gray-300 p-2 rounded-lg")
    }
    private static createUnofficialThemeList(buttonClass: string, state: UserRelatedState, themeListClasses: string, search: UIEventSource<string>): BaseUIElement {
        var currentIds: Store<string[]> = state.installedUserThemes

        var stableIds = Stores.ListStabilized<string>(currentIds)
        return new VariableUiElement(
            stableIds.map(ids => {
                const allThemes: { element: BaseUIElement, predicate?: (s: string) => boolean }[] = []
                for (const id of ids) {
                    const themeInfo = state.GetUnofficialTheme(id)
                    if(themeInfo === undefined){
                        continue
                    }
                    const link = MoreScreen.createLinkButton(state, themeInfo, true)
                    if (link !== undefined) {
                        allThemes.push({
                            element: link.SetClass(buttonClass),
                            predicate: s => id.toLowerCase().indexOf(s) >= 0
                        })
                    }
                }
                if (allThemes.length <= 0) {
                    return undefined;
                }
                return new Combine([
                    Translations.t.general.customThemeIntro,
                    new FilteredCombine(allThemes, search, {
                        innerClasses: themeListClasses,
                        onEmpty: MoreScreen.NothingFound(search)
                    })
                ]);
            }));
    }

    private static createPreviouslyVistedHiddenList(state: UserRelatedState, buttonClass: string, themeListStyle: string, search: UIEventSource<string>): BaseUIElement {
        const t = Translations.t.general.morescreen
        const prefix = "mapcomplete-hidden-theme-"
        const hiddenThemes = themeOverview["default"].filter(layout => layout.hideFromOverview)
        const hiddenTotal = hiddenThemes.length

        return new Toggle(
            new VariableUiElement(
                state.osmConnection.preferencesHandler.preferences.map(allPreferences => {
                    const knownThemes: Set<string> = new Set(Utils.NoNull(Object.keys(allPreferences)
                        .filter(key => key.startsWith(prefix))
                        .map(key => key.substring(prefix.length, key.length - "-enabled".length))));

                    if (knownThemes.size === 0) {
                        return undefined
                    }

                    const knownThemeDescriptions = hiddenThemes.filter(theme => knownThemes.has(theme.id))
                        .map(theme => ({
                            element: MoreScreen.createLinkButton(state, theme)?.SetClass(buttonClass),
                            predicate: MoreScreen.MatchesLayoutFunc(theme)
                        }));

                    const knownLayouts = new FilteredCombine(knownThemeDescriptions,
                        search,
                        {
                            innerClasses: themeListStyle,
                            onEmpty: MoreScreen.NothingFound(search)
                        }
                    )

                    return new Combine([
                        new Title(t.previouslyHiddenTitle),
                        t.hiddenExplanation.Subs({
                            hidden_discovered: "" + knownThemes.size,
                            total_hidden: "" + hiddenTotal
                        }),
                        knownLayouts
                    ])

                })
            ).SetClass("flex flex-col"),
            undefined,
            state.osmConnection.isLoggedIn
        )


    }

    private static MatchesLayoutFunc(layout: {
        id: string,
        title: any,
        shortDescription: any,
        keywords?: any[]
    }): ((search: string) => boolean) {
        return (search: string) => {
            search = search.toLocaleLowerCase()
            if (layout.id.toLowerCase().indexOf(search) >= 0) {
                return true;
            }
            const entitiesToSearch = [layout.shortDescription, layout.title, ...(layout.keywords ?? [])]
            for (const entity of entitiesToSearch) {
                if (entity === undefined) {
                    continue
                }
                const term = entity["*"] ?? entity[Locale.language.data]
                if (term?.toLowerCase()?.indexOf(search) >= 0) {
                    return true
                }
            }

            return false;
        }
    }

    private static createOfficialThemesList(state: { osmConnection: OsmConnection, locationControl?: UIEventSource<Loc> }, buttonClass: string, themeListStyle: string, search: UIEventSource<string>): BaseUIElement {



        let buttons: { element: BaseUIElement, predicate?: (s: string) => boolean }[] = MoreScreen.officialThemes.map((layout) => {

            if (layout === undefined) {
                console.trace("Layout is undefined")
                return undefined
            }
            if (layout.hideFromOverview) {
                return undefined;
            }
            const button = MoreScreen.createLinkButton(state, layout)?.SetClass(buttonClass);
            if (layout.id === personal.id) {
                const element = new VariableUiElement(
                    state.osmConnection.userDetails.map(userdetails => userdetails.csCount)
                        .map(csCount => {
                            if (csCount < Constants.userJourney.personalLayoutUnlock) {
                                return undefined
                            } else {
                                return button
                            }
                        })
                )
                return {element}
            }


            return {element: button, predicate: MoreScreen.MatchesLayoutFunc(layout)};
        })

        const professional = MoreScreen.CreateProffessionalSerivesButton();
        const customGeneratorLink = MoreScreen.createCustomGeneratorButton(state)
        buttons.splice(0, 0,
            {element: customGeneratorLink},
            {element: professional});
        return new FilteredCombine(buttons, search, {
            innerClasses: themeListStyle,
            onEmpty: MoreScreen.NothingFound(search)
        });
    }

    /*
    * Returns either a link to the issue tracker or a link to the custom generator, depending on the achieved number of changesets
    * */
    private static createCustomGeneratorButton(state: { osmConnection: OsmConnection }): VariableUiElement {
        const tr = Translations.t.general.morescreen;
        return new VariableUiElement(
            state.osmConnection.userDetails.map(userDetails => {
                if (userDetails.csCount < Constants.userJourney.themeGeneratorReadOnlyUnlock) {
                    return new SubtleButton(null, tr.requestATheme.Clone(), {
                        url: "https://github.com/pietervdvn/MapComplete/issues",
                        newTab: true
                    });
                }
                return new SubtleButton(Svg.pencil_ui(), tr.createYourOwnTheme.Clone(), {
                    url: "https://pietervdvn.github.io/mc/legacy/070/customGenerator.html",
                    newTab: false
                });
            })
        )
    }


}