import {UIElement} from "../UI/UIElement";
import {UIEventSource} from "../UI/UIEventSource";
import {And, Tag, TagsFilter, TagUtils} from "../Logic/TagsFilter";
import {UIRadioButton} from "../UI/Base/UIRadioButton";
import {FixedUiElement} from "../UI/Base/FixedUiElement";
import {SaveButton} from "../UI/SaveButton";
import {Changes} from "../Logic/Changes";
import {TextField} from "../UI/Base/TextField";
import {UIInputElement} from "../UI/Base/UIInputElement";
import {UIRadioButtonWithOther} from "../UI/Base/UIRadioButtonWithOther";
import {VariableUiElement} from "../UI/Base/VariableUIElement";

export class TagRenderingOptions {

    /**
     * Notes: by not giving a 'question', one disables the question form alltogether
     */

    public options: {
        priority?: number; question?: string; primer?: string;
        freeform?: { key: string; tagsPreprocessor?: (tags: any) => any; template: string; renderTemplate: string; placeholder?: string; extraTags?: TagsFilter }; mappings?: { k: TagsFilter; txt: string; priority?: number, substitute?: boolean }[]
    };


    constructor(options: {
        priority?: number

        question?: string,
        primer?: string,
        tagsPreprocessor?: ((tags: any) => any),
        freeform?: {
            key: string, template: string,
            renderTemplate: string
            placeholder?: string,
            extraTags?: TagsFilter,
        },
        mappings?: { k: TagsFilter, txt: string, priority?: number, substitute?: boolean }[]
    }) {
        this.options = options;

    }


    IsQuestioning(tags: any): boolean {
        const tagsKV = TagUtils.proprtiesToKV(tags);

        for (const oneOnOneElement of this.options.mappings) {
            if (oneOnOneElement.k.matches(tagsKV)) {
                return false;
            }
        }
        if (this.options.freeform !== undefined && tags[this.options.freeform.key] !== undefined) {
            return false;
        }
        if (this.options.question === undefined) {
            return false;
        }

        return true;
    }


}

export class TagRendering extends UIElement {


    public elementPriority: number;


    private _question: string;
    private _primer: string;
    private _mapping: { k: TagsFilter, txt: string, priority?: number, substitute?: boolean }[];
    private _tagsPreprocessor?: ((tags: any) => any);
    private _freeform: {
        key: string, template: string,
        renderTemplate: string,

        placeholder?: string,
        extraTags?: TagsFilter
    };

    private readonly _questionElement: UIElement;
    private readonly _textField: TextField<TagsFilter>; // Only here to update

    private readonly _saveButton: UIElement;
    private readonly _skipButton: UIElement;
    private readonly _editButton: UIElement;

    private readonly _questionSkipped: UIEventSource<boolean> = new UIEventSource<boolean>(false);

    private readonly _editMode: UIEventSource<boolean> = new UIEventSource<boolean>(false);


    constructor(tags: UIEventSource<any>, changes: Changes, options: {
        priority?: number

        question?: string,
        primer?: string,

        freeform?: {
            key: string, template: string,
            renderTemplate: string
            placeholder?: string,
            extraTags?: TagsFilter,
        },
        tagsPreprocessor?: ((tags: any) => any),
        mappings?: { k: TagsFilter, txt: string, priority?: number, substitute?: boolean }[]
    }) {
        super(tags);
        const self = this;
        this.ListenTo(this._questionSkipped);
        this.ListenTo(this._editMode);

        this._question = options.question;
        this._primer = options.primer ?? "";
        this._tagsPreprocessor = options.tagsPreprocessor;
        this._mapping = [];
        this._freeform = options.freeform;
        this.elementPriority = options.priority ?? 0;

        // Prepare the choices for the Radio buttons
        let i = 0;
        const choices: UIElement[] = [];
        
        for (const choice of options.mappings ?? []) {
            if (choice.k === null) {
                this._mapping.push(choice);
                continue;
            }
            let choiceSubbed = choice;
            if (choice.substitute) {
                choiceSubbed = {
                    k : choice.k.substituteValues(
                        options.tagsPreprocessor(this._source.data)),
                    txt : this.ApplyTemplate(choice.txt),
                    substitute: false,
                    priority: choice.priority
                }
            }
            

            choices.push(new FixedUiElement(choiceSubbed.txt));
            this._mapping.push(choiceSubbed);
            i++;
        }

        // Map radiobutton choice and textfield answer onto tagfilter. That tagfilter will be pushed into the changes later on
        const pickChoice = (i => {
            if (i === undefined || i === null) {
                return undefined
            }
            return self._mapping[i].k
        });
        const pickString =
            (string) => {
                if (string === "" || string === undefined) {
                    return undefined;
                }
                const tag = new Tag(self._freeform.key, string);
                if (self._freeform.extraTags === undefined) {
                    return tag;
                }
                return new And([
                        self._freeform.extraTags,
                        tag
                    ]
                );
            };


        // Prepare the actual input element -> pick an appropriate implementation
        let inputElement: UIInputElement<TagsFilter>;

        if (this._freeform !== undefined && this._mapping !== undefined) {
            // Radio buttons with 'other'
            inputElement = new UIRadioButtonWithOther(
                choices,
                this._freeform.template,
                this._freeform.placeholder,
                pickChoice,
                pickString
            );
            this._questionElement = inputElement;
        } else if (this._mapping !== undefined) {
            // This is a classic radio selection element
            inputElement = new UIRadioButton(new UIEventSource(choices), pickChoice)
            this._questionElement = inputElement;
        } else if (this._freeform !== undefined) {
            this._textField = new TextField(new UIEventSource<string>(this._freeform.placeholder), pickString);
            inputElement = this._textField;
            this._questionElement = new FixedUiElement(this._freeform.template.replace("$$$", inputElement.Render()))
        } else {
            throw "Invalid questionRendering, expected at least choices or a freeform"
        }


        const save = () => {
            const selection = inputElement.GetValue().data;
            if (selection) {
                changes.addTag(tags.data.id, selection);
            }
            self._editMode.setData(false);
        }

        const cancel = () => {
            self._questionSkipped.setData(true);
            self._editMode.setData(false);
        }

        // Setup the save button and it's action
        this._saveButton = new SaveButton(inputElement.GetValue())
            .onClick(save);

        if (this._question !== undefined) {
            this._editButton = new FixedUiElement("<img class='editbutton' src='./assets/pencil.svg' alt='edit'>")
                .onClick(() => {
                    console.log("Click", self._editButton);
                    if (self._textField) {
                        self._textField.value.setData(self._source.data["name"] ?? "");
                    }

                    self._editMode.setData(true);
                });
        } else {
            this._editButton = new FixedUiElement("");
        }


        const cancelContents = this._editMode.map((isEditing) => {
            if (isEditing) {
                return "<span class='skip-button'>Annuleren</span>";
            } else {
                return "<span class='skip-button'>Ik weet het niet zeker...</span>";
            }
        });
        // And at last, set up the skip button
        this._skipButton = new VariableUiElement(cancelContents).onClick(cancel);


    }

    private ApplyTemplate(template: string): string {
        let tags = this._source.data;
        if (this._tagsPreprocessor !== undefined) {
            tags = this._tagsPreprocessor(tags);
        }

        
        return TagUtils.ApplyTemplate(template, tags);
    }

    IsKnown(): boolean {
        const tags = TagUtils.proprtiesToKV(this._source.data);

        for (const oneOnOneElement of this._mapping) {
            if (oneOnOneElement.k === null || oneOnOneElement.k.matches(tags)) {
                return true;
            }
        }
        return this._freeform !== undefined && this._source.data[this._freeform.key] !== undefined;
    }

    IsQuestioning(): boolean {
        if (this.IsKnown()) {
            return false;
        }
        if (this._question === undefined) {
            // We don't ask this question in the first place
            return false;
        }
        if (this._questionSkipped.data) {
            // We don't ask for this question anymore, skipped by user
            return false;
        }
        return true;
    }

    private RenderAnwser(): string {
        const tags = TagUtils.proprtiesToKV(this._source.data);

        let freeform = "";
        let freeformScore = -10;
        if (this._freeform !== undefined && this._source.data[this._freeform.key] !== undefined) {
            freeform = this.ApplyTemplate(this._freeform.renderTemplate);
            freeformScore = 0;
        }

        if (this._mapping !== undefined) {

            let highestScore = -100;
            let highestTemplate = undefined;
            for (const oneOnOneElement of this._mapping) {
                if (oneOnOneElement.k == null ||
                    oneOnOneElement.k.matches(tags)) {
                    // We have found a matching key -> we use the template, but only if it scores better
                    let score = oneOnOneElement.priority ??
                        (oneOnOneElement.k === null ? -1 : 0);
                    if (score > highestScore) {
                        highestScore = score;
                        highestTemplate = oneOnOneElement.txt
                    }
                }
            }

            if (freeformScore > highestScore) {
                return freeform;
            }

            if (highestTemplate !== undefined) {
                // we render the found template
                return this._primer + this.ApplyTemplate(highestTemplate);
            }
        } else {
            return freeform;
        }

    }

    protected InnerRender(): string {

        if (this.IsQuestioning() || this._editMode.data) {
            // Not yet known or questioning, we have to ask a question


            return "<div class='question'>" +
                this._question +
                (this._question !== "" ? "<br/>" : "") +
                this._questionElement.Render() +
                this._skipButton.Render() +
                this._saveButton.Render() +
                "</div>"
        }

        if (this.IsKnown()) {
            const html = this.RenderAnwser();
            if (html == "") {
                return "";
            }
            return "<span class='answer'>" +
                "<span class='answer-text'>" + html + "</span>" + this._editButton.Render() +
                "</span>";
        }

        return "";

    }

    InnerUpdate(htmlElement: HTMLElement) {
        super.InnerUpdate(htmlElement);
        this._questionElement.Update();
        this._saveButton.Update();
        this._skipButton.Update();
        this._textField?.Update();
        this._editButton.Update();
    }

}