import {AutoAction} from "./AutoApplyButton";
import Translations from "../i18n/Translations";
import {VariableUiElement} from "../Base/VariableUIElement";
import BaseUIElement from "../BaseUIElement";
import {FixedUiElement} from "../Base/FixedUiElement";
import {UIEventSource} from "../../Logic/UIEventSource";
import {SubtleButton} from "../Base/SubtleButton";
import Combine from "../Base/Combine";
import ChangeTagAction from "../../Logic/Osm/Actions/ChangeTagAction";
import {And} from "../../Logic/Tags/And";
import Toggle from "../Input/Toggle";
import {Utils} from "../../Utils";
import {Tag} from "../../Logic/Tags/Tag";
import FeaturePipelineState from "../../Logic/State/FeaturePipelineState";

export default class TagApplyButton implements AutoAction {
    public readonly funcName = "tag_apply";
    public readonly docs = "Shows a big button; clicking this button will apply certain tags onto the feature.\n\nThe first argument takes a specification of which tags to add.\n" + Utils.Special_visualizations_tagsToApplyHelpText;
    public readonly supportsAutoAction = true;
    public readonly args = [
        {
            name: "tags_to_apply",
            doc: "A specification of the tags to apply"
        },
        {
            name: "message",
            doc: "The text to show to the contributor"
        },
        {
            name: "image",
            doc: "An image to show to the contributor on the button"
        },
        {
            name: "id_of_object_to_apply_this_one",
            defaultValue: undefined,
            doc: "If specified, applies the the tags onto _another_ object. The id will be read from properties[id_of_object_to_apply_this_one] of the selected object. The tags are still calculated based on the tags of the _selected_ element"
        }
    ];

    public static generateTagsToApply(spec: string, tagSource: UIEventSource<any>): UIEventSource<Tag[]> {

        const tgsSpec = spec.split(";").map(spec => {
            const kv = spec.split("=").map(s => s.trim());
            if (kv.length != 2) {
                throw "Invalid key spec: multiple '=' found in " + spec
            }
            return kv
        })

        for (const spec of tgsSpec) {
            if (spec[0].endsWith(':')) {
                throw "A tag specification for import or apply ends with ':'. The theme author probably wrote key:=otherkey instead of key=$otherkey"
            }
        }

        return tagSource.map(tags => {
            const newTags: Tag [] = []
            for (const [key, value] of tgsSpec) {
                if (value.indexOf('$') >= 0) {

                    let parts = value.split("$")
                    // THe first of the split won't start with a '$', so no substitution needed
                    let actualValue = parts[0]
                    parts.shift()

                    for (const part of parts) {
                        const [_, varName, leftOver] = part.match(/([a-zA-Z0-9_:]*)(.*)/)
                        actualValue += (tags[varName] ?? "") + leftOver
                    }
                    newTags.push(new Tag(key, actualValue))
                } else {
                    newTags.push(new Tag(key, value))
                }
            }
            return newTags
        })

    }

    public readonly example = "`{tag_apply(survey_date=$_now:date, Surveyed today!)}`, `{tag_apply(addr:street=$addr:street, Apply the address, apply_icon.svg, _closest_osm_id)";

    async applyActionOn(state: FeaturePipelineState, tags: UIEventSource<any>, args: string[]) : Promise<void>{
        const tagsToApply = TagApplyButton.generateTagsToApply(args[0], tags)
        const targetIdKey = args[3]

        const targetId = tags.data[targetIdKey] ?? tags.data.id
        const changeAction = new ChangeTagAction(targetId,
            new And(tagsToApply.data),
            tags.data, // We pass in the tags of the selected element, not the tags of the target element!
            {
                theme: state.layoutToUse.id,
                changeType: "answer"
            }
        )
        await state.changes.applyAction(changeAction)
    }

    public constr(state: FeaturePipelineState, tags: UIEventSource<any>, args: string[]): BaseUIElement {
        const tagsToApply = TagApplyButton.generateTagsToApply(args[0], tags)
        const msg = args[1]
        let image = args[2]?.trim()
        if (image === "" || image === "undefined") {
            image = undefined
        }
        const targetIdKey = args[3]
        const t = Translations.t.general.apply_button

        const tagsExplanation = new VariableUiElement(tagsToApply.map(tagsToApply => {
                const tagsStr = tagsToApply.map(t => t.asHumanString(false, true)).join("&");
                let el: BaseUIElement = new FixedUiElement(tagsStr)
                if (targetIdKey !== undefined) {
                    const targetId = tags.data[targetIdKey] ?? tags.data.id
                    el = t.appliedOnAnotherObject.Subs({tags: tagsStr, id: targetId})
                }
                return el;
            }
        )).SetClass("subtle")
        const self = this
        const applied = new UIEventSource(false)
        const applyButton = new SubtleButton(image, new Combine([msg, tagsExplanation]).SetClass("flex flex-col"))
            .onClick(() => {
                self.applyActionOn(state, tags, args)
                applied.setData(true)
            })


        return new Toggle(
            new Toggle(
                t.isApplied.SetClass("thanks"),
                applyButton,
                applied
            ),
            undefined, state.osmConnection.isLoggedIn)
    }
}