import type { EventKey, SurveyEventKey, WidgetCallbacks, WidgetResponse } from "../../domain";
import type { WidgetStateManager } from "../WidgetStateManager";
import { handleFormClose, handleFormError, handleFormPageChanged, handleQuestionAnswered, handleFormCompleted, handleFormPartialCompleted, handleFormResize } from "./EventHandlers";

export class EventHandlerFactory {
    private readonly surveyToFormMapping: Record<string, EventKey> = {
        closeSoluCXWidget: "FORM_CLOSE",
        dismissSoluCXWidget: "FORM_CLOSE",
        completeSoluCXWidget: "FORM_COMPLETED",
        partialSoluCXWidget: "FORM_PARTIALCOMPLETED",
        resizeSoluCXWidget: "FORM_RESIZE",
        errorSoluCXWidget: "FORM_ERROR",
    };

    constructor(
        private hide: () => void,
        private resize: (height: string) => void,
        private userId: string,
        private transactionId?: string,
        private callbacks?: WidgetCallbacks,
        private stateManager?: WidgetStateManager,
    ) {}

    private parse(message: string): { key: string; value: string } {
        const separatorIndex = message.indexOf("-");
        if (separatorIndex === -1) return { key: message, value: "" };
        return {
            key: message.slice(0, separatorIndex),
            value: message.slice(separatorIndex + 1),
        };
    }

    private mapSurveyKeyToFormKey(surveyKey: SurveyEventKey): EventKey {
        return this.surveyToFormMapping[surveyKey] as EventKey;
    }

    private normalizeKey(key: string, isForm: boolean): EventKey {
        if (isForm) {
            return key as EventKey;
        }
        return this.mapSurveyKeyToFormKey(key as SurveyEventKey);
    }

    async processMessage(message: string, isForm: boolean): Promise<WidgetResponse> {
        const parsed = this.parse(message);
        const eventKey = this.normalizeKey(parsed.key, isForm);
        return this.handle(eventKey, parsed.value);
    }

    private async handle(eventKey: EventKey, value: string): Promise<WidgetResponse> {
        switch (eventKey) {
            case "FORM_CLOSE":
                return handleFormClose(this.hide, this.stateManager, this.callbacks);
            case "FORM_ERROR":
                return handleFormError(value, this.hide, this.callbacks);
            case "FORM_PAGECHANGED":
                return handleFormPageChanged(value, this.callbacks);
            case "QUESTION_ANSWERED":
                return handleQuestionAnswered(this.stateManager, this.callbacks);
            case "FORM_COMPLETED":
                return handleFormCompleted(this.userId, this.transactionId, this.stateManager, this.callbacks);
            case "FORM_PARTIALCOMPLETED":
                return handleFormPartialCompleted(this.userId, this.transactionId, this.stateManager, this.callbacks);
            case "FORM_RESIZE":
                return handleFormResize(value, this.resize, this.callbacks);
            default:
                return { status: "error", message: "Unknown event" };
        }
    }
}