/*
 * Copyright 2025 Google. This software is provided as-is, without warranty or representation for any use or purpose. 
 * Your use of it is subject to your agreement with Google.
 */

package com.example.mapper.notification;

import com.example.dto.dialogflow.notification.ExternalNotRequestDTO;
import com.example.dto.dialogflow.base.DetectIntentRequestDTO;
import com.example.dto.dialogflow.conversation.QueryInputDTO;
import com.example.dto.dialogflow.conversation.QueryParamsDTO;
import com.example.dto.dialogflow.conversation.TextInputDTO;


import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * Spring component for mapping an external notification request to a Dialogflow `DetectIntentRequestDTO`.
 * This class takes a simplified `ExternalNotRequestDTO` and converts it into the structured
 * DTO required for a Dialogflow API call, specifically for triggering a notification event.
 * It ensures required parameters like the phone number are present and populates the
 * request with event-specific details.
 */
@Component
public class ExternalNotRequestMapper {
    private static final String LANGUAGE_CODE = "es";
    private static final String TELEPHONE_PARAM_NAME = "telefono";
    private static final String NOTIFICATION_TEXT_PARAM = "notification_text";
    private static final String NOTIFICATION_LABEL = "NOTIFICACION";
    private static final String PREFIX_PO_PARAM = "notification_po_";



    public DetectIntentRequestDTO map(ExternalNotRequestDTO request) {
        Objects.requireNonNull(request, "NotificationRequestDTO cannot be null for mapping.");

        if (request.phoneNumber() == null || request.phoneNumber().isEmpty()) {
            throw new IllegalArgumentException("Phone numbers is required and cannot be empty in NotificationRequestDTO.");
        }
        String phoneNumber = request.phoneNumber();

        Map<String, Object> parameters = new HashMap<>();
        parameters.put(TELEPHONE_PARAM_NAME, phoneNumber);
        parameters.put(NOTIFICATION_TEXT_PARAM, request.text());


        if (request.hiddenParameters() != null && !request.hiddenParameters().isEmpty()) {
            StringBuilder poBuilder = new StringBuilder();
            request.hiddenParameters().forEach((key, value) -> {
                parameters.put(PREFIX_PO_PARAM + key, value);
                poBuilder.append(key).append(": ").append(value).append("\n");
            });
            parameters.put("po", poBuilder.toString());
        }

        TextInputDTO textInput = new TextInputDTO(NOTIFICATION_LABEL);
        QueryInputDTO queryInput = new QueryInputDTO(textInput, null, LANGUAGE_CODE);


        QueryParamsDTO queryParams = new QueryParamsDTO(parameters);

        return new DetectIntentRequestDTO(queryInput, queryParams);
    }
}