// SPDX-FileCopyrightText: 2021 Johannes Loher
// SPDX-FileCopyrightText: 2021 Oliver Rümpelein
//
// SPDX-License-Identifier: MIT

import { DialogWithListeners } from "../apps/dialog-with-listeners";
import { DS4 } from "../config";
import { getGame } from "../utils/utils";

/** @typedef {"publicroll" | "gmroll" | "gmroll" | "selfroll"} RollModes */

/**
 * Most basic class responsible for generating the chat formula and passing it to the chat as roll.
 */
class CheckFactory {
    /**
     * @param {number} checkTargetNumber                    The check target number for this check factory
     * @param {number} checkModifier                        The check modifier for this check factory
     * @param {Partial<DS4CheckFactoryOptions>} [options]   Options for this check factory
     */
    constructor(checkTargetNumber, checkModifier, options = {}) {
        this.#checkTargetNumber = checkTargetNumber;
        this.#checkModifier = checkModifier;
        this.#options = foundry.utils.mergeObject(this.constructor.defaultOptions, options);
    }

    /**
     * The check target number for this check factory.
     * @type {number}
     */
    #checkTargetNumber;

    /**
     * The check modifier for this check factory.
     * @type {number}
     */
    #checkModifier;

    /**
     * The options for this check factory.
     * @type {DS4CheckFactoryOptions}
     */
    #options;

    /**
     * The default options of thos CheckFactory class. Upon instantiation, they are merged with the explicitly provided options.
     * @type {DS4CheckFactoryOptions}
     */
    static get defaultOptions() {
        return {
            maximumCoupResult: 1,
            minimumFumbleResult: 20,
            useSlayingDice: false,
            rollMode: "publicroll",
        };
    }

    /**
     * Execute this check factory.
     * @returns {Promise<ChatMessage | undefined>} A promise that resolves to the created chat message for the roll */
    async execute() {
        const innerFormula = ["ds", this.createCheckTargetNumberModifier(), this.createCoupFumbleModifier()].filterJoin(
            "",
        );
        const formula = this.#options.useSlayingDice ? `{${innerFormula}}x` : innerFormula;
        const roll = Roll.create(formula);
        const speaker = this.#options.speaker ?? ChatMessage.getSpeaker();

        return roll.toMessage(
            {
                speaker,
                flavor: this.#options.flavor,
                flags: this.#options.flavorData ? { ds4: { flavorData: this.#options.flavorData } } : undefined,
            },
            { rollMode: this.#options.rollMode, create: true },
        );
    }

    /**
     * Create the check target number modifier for this roll.
     * @returns string
     */
    createCheckTargetNumberModifier() {
        const totalCheckTargetNumber = this.#checkTargetNumber + this.#checkModifier;
        return totalCheckTargetNumber >= 0 ? `v${this.#checkTargetNumber + this.#checkModifier}` : "v0";
    }

    /**
     * Create the coup fumble modifier for this roll.
     * @returns {string | null}
     */
    createCoupFumbleModifier() {
        const isMinimumFumbleResultRequired =
            this.#options.minimumFumbleResult !== this.constructor.defaultOptions.minimumFumbleResult;
        const isMaximumCoupResultRequired =
            this.#options.maximumCoupResult !== this.constructor.defaultOptions.maximumCoupResult;

        if (isMinimumFumbleResultRequired || isMaximumCoupResultRequired) {
            return `c${this.#options.maximumCoupResult ?? ""}:${this.#options.minimumFumbleResult ?? ""}`;
        } else {
            return null;
        }
    }
}

/**
 * Asks the user for all unknown/necessary information and passes them on to perform a roll.
 * @param {number} checkTargetNumber                        The Check Target Number ("CTN")
 * @param {Partial<DS4CheckFactoryOptions>} [options={}]    Options changing the behavior of the roll and message.
 * @returns {Promise<ChateMessage|undefined>} A promise that resolves to the chat message created by the roll
 */
export async function createCheckRoll(checkTargetNumber, options = {}) {
    // Ask for additional required data;
    const interactiveRollData = await askForInteractiveRollData(checkTargetNumber, options);

    const newTargetValue = interactiveRollData.checkTargetNumber ?? checkTargetNumber;
    const checkModifier = interactiveRollData.checkModifier ?? 0;
    /** @type {Partial<DS4CheckFactoryOptions>} */
    const newOptions = {
        maximumCoupResult: interactiveRollData.maximumCoupResult ?? options.maximumCoupResult,
        minimumFumbleResult: interactiveRollData.minimumFumbleResult ?? options.minimumFumbleResult,
        useSlayingDice: getGame().settings.get("ds4", "useSlayingDiceForAutomatedChecks"),
        rollMode: interactiveRollData.rollMode ?? options.rollMode,
        flavor: options.flavor,
        flavorData: options.flavorData,
        speaker: options.speaker,
    };

    // Create Factory
    const cf = new CheckFactory(newTargetValue, checkModifier, newOptions);

    // Possibly additional processing

    // Execute roll
    return cf.execute();
}

/**
 * Responsible for rendering the modal interface asking for the check modifier and (currently) additional
 * data.
 *
 * @notes
 * At the moment, this asks for more data than it will do after some iterations.
 *
 * @param {number} checkTargetNumber                                                            The check target number
 * @param {Partial<DS4CheckFactoryOptions>} [options={}]                                        Predefined roll options
 * @param {template?: string | undefined; title?: string | undefined} [additionalOptions={}]    Additional options to use for the dialog
 * @returns {Promise<Partial<IntermediateInteractiveRollData>>} A promise that resolves to the data given by the user.
 */
async function askForInteractiveRollData(checkTargetNumber, options = {}, { template, title } = {}) {
    const usedTemplate = template ?? "systems/ds4/templates/dialogs/roll-options.hbs";
    const usedTitle = title ?? getGame().i18n.localize("DS4.DialogRollOptionsDefaultTitle");
    const id = foundry.utils.randomID();
    const templateData = {
        title: usedTitle,
        checkTargetNumber: checkTargetNumber,
        maximumCoupResult: options.maximumCoupResult ?? this.constructor.defaultOptions.maximumCoupResult,
        minimumFumbleResult: options.minimumFumbleResult ?? this.constructor.defaultOptions.minimumFumbleResult,
        rollMode: options.rollMode ?? getGame().settings.get("core", "rollMode"),
        rollModes: CONFIG.Dice.rollModes,
        checkModifiers: Object.entries(DS4.i18n.checkModifiers).map(([key, translation]) => {
            if (key in DS4.checkModifiers) {
                const value = DS4.checkModifiers[key];
                const label = `${translation} (${value >= 0 ? `+${value}` : value})`;
                return { value, label };
            }
            return { value: key, label: translation };
        }),
        id,
    };
    const renderedHtml = await renderTemplate(usedTemplate, templateData);

    const dialogPromise = new Promise((resolve) => {
        new DialogWithListeners(
            {
                title: usedTitle,
                content: renderedHtml,
                buttons: {
                    ok: {
                        icon: '<i class="fas fa-check"></i>',
                        label: getGame().i18n.localize("DS4.GenericOkButton"),
                        callback: (html) => {
                            if (!("jquery" in html)) {
                                throw new Error(
                                    getGame().i18n.format("DS4.ErrorUnexpectedHtmlType", {
                                        exType: "JQuery",
                                        realType: "HTMLElement",
                                    }),
                                );
                            } else {
                                const innerForm = html[0]?.querySelector("form");
                                if (!innerForm) {
                                    throw new Error(
                                        getGame().i18n.format("DS4.ErrorCouldNotFindHtmlElement", {
                                            htmlElement: "form",
                                        }),
                                    );
                                }
                                resolve(innerForm);
                            }
                        },
                    },
                    cancel: {
                        icon: '<i class="fas fa-times"></i>',
                        label: getGame().i18n.localize("DS4.GenericCancelButton"),
                    },
                },
                default: "ok",
            },
            {
                activateAdditionalListeners: (html, app) => {
                    const checkModifierCustomFormGroup = html
                        .find(`#check-modifier-custom-${id}`)
                        .parent(".form-group");
                    html.find(`#check-modifier-${id}`).on("change", (event) => {
                        if (
                            event.currentTarget.value === "custom" &&
                            checkModifierCustomFormGroup.hasClass("ds4-hidden")
                        ) {
                            checkModifierCustomFormGroup.removeClass("ds4-hidden");
                            app.setPosition({ height: "auto" });
                        } else if (!checkModifierCustomFormGroup.hasClass("ds4-hidden")) {
                            checkModifierCustomFormGroup.addClass("ds4-hidden");
                            app.setPosition({ height: "auto" });
                        }
                    });
                },
                id,
            },
        ).render(true);
    });
    const dialogForm = await dialogPromise;
    return parseDialogFormData(dialogForm);
}

/**
 * Extracts Dialog data from the returned DOM element.
 * @param {HTMLFormElement} formData    The filed dialog
 * @returns {Partial<IntermediateInteractiveRollData>}
 */
function parseDialogFormData(formData) {
    const chosenCheckTargetNumber = parseInt(formData["check-target-number"]?.value);
    const chosenCheckModifier = formData["check-modifier"]?.value;

    const chosenCheckModifierValue =
        chosenCheckModifier === "custom"
            ? parseInt(formData["check-modifier-custom"]?.value)
            : parseInt(chosenCheckModifier);

    const chosenMaximumCoupResult = parseInt(formData["maximum-coup-result"]?.value);
    const chosenMinimumFumbleResult = parseInt(formData["minimum-fumble-result"]?.value);
    const chosenRollMode = formData["roll-mode"]?.value;

    return {
        checkTargetNumber: Number.isSafeInteger(chosenCheckTargetNumber) ? chosenCheckTargetNumber : undefined,
        checkModifier: Number.isSafeInteger(chosenCheckModifierValue) ? chosenCheckModifierValue : undefined,
        maximumCoupResult: Number.isSafeInteger(chosenMaximumCoupResult) ? chosenMaximumCoupResult : undefined,
        minimumFumbleResult: Number.isSafeInteger(chosenMinimumFumbleResult) ? chosenMinimumFumbleResult : undefined,
        rollMode: Object.keys(CONFIG.Dice.rollModes).includes(chosenRollMode) ? chosenRollMode : undefined,
    };
}

/**
 * Contains data that needs retrieval from an interactive Dialog.
 * @typedef {object} InteractiveRollData
 * @property {number} checkModifier
 * @property {RollModes} rollMode
 */

/**
 * Contains *CURRENTLY* necessary Data for drafting a roll.
 *
 * @deprecated
 * Quite a lot of this information is requested due to a lack of automation:
 *  - maximumCoupResult
 *  - minimumFumbleResult
 *  - checkTargetNumber
 *
 * They will and should be removed once effects and data retrieval is in place.
 * If a "raw" roll dialog is necessary, create another pre-processing Dialog
 * class asking for the required information.
 * This interface should then be replaced with the {@link InteractiveRollData}.
 * @typedef {object} IntermediateInteractiveRollData
 * @property {number} checkTargetNumber
 * @property {number} maximumCoupResult
 * @property {number} minimumFumbleResult
 */

/**
 * The minimum behavioral options that need to be passed to the factory.
 * @typedef {object} DS4CheckFactoryOptions
 * @property {number} maximumCoupResult
 * @property {number} minimumFumbleResult
 * @property {boolean} useSlayingDice
 * @property {RollModes} rollMode
 * @property {string} [flavor]
 * @property {Record<string, string | number | null>} [flavorData]
 * @property {ChatSpeakerData} [speaker]
 */

/**
 * @typedef {object} ChatSpeakerData
 * @property {string | null} [scene]
 * @property {string | null} [actor]
 * @property {string | null} [token]
 * @property {string | null} [alias]
 */