// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! This module defines structures for handling composite requests and responses in an API system.
//! It includes types for parsing incoming composite requests, generating responses, and
//! managing individual sub-requests and sub-responses within a composite operation.

// For using Json name directly
#![allow(non_snake_case)]

use serde_json::Value;

/// Represents a composite request containing multiple sub-requests.
#[derive(serde::Deserialize)]
pub struct CompositeRequest {
    /// A vector of sub-requests to be processed as part of this composite request.
    #[allow(dead_code)]
    pub compositeRequest: Vec<SubRequest>,
}

/// Represents an individual sub-request within a composite request.
#[derive(Debug, Default, Clone, PartialEq, serde::Deserialize)]
pub struct SubRequest {
    /// The HTTP method for this sub-request (e.g., "GET", "POST").
    pub method: String,
    /// The URL for this sub-request.
    pub url: String,
    /// A unique identifier for this sub-request within the composite request.
    pub referenceId: String,
    /// If true, the entire composite request should be aborted if this sub-request fails.
    pub abortOnFailure: Option<bool>,
    /// The body of the sub-request, if any.
    pub body: Option<Value>,
}

/// Represents the response to a composite request.
#[derive(serde::Serialize)]
pub struct CompositeResponse {
    /// A vector of sub-responses corresponding to each sub-request in the original composite request.
    pub compositeResponse: Vec<SubResponse>,
}

/// Represents the possible types of responses that can be returned from a request.
#[derive(Debug)]
pub enum RequestResponse {
    /// A JSON response.
    Json(Value),
}

impl Default for RequestResponse {
    /// Provides a default error response.
    fn default() -> Self {
        RequestResponse::Json(serde_json::json!({
            "status": "error",
            "message": "Invalid response",
            "code": 500
        }))
    }
}

/// Represents the response to an individual sub-request within a composite request.
#[derive(Default, serde::Serialize)]
pub struct SubResponse {
    /// The body of the sub-response.
    pub body: Option<Value>,
    /// Any HTTP headers included in the sub-response.
    pub httpHeaders: Option<Value>,
    /// The HTTP status code for this sub-response.
    pub httpStatusCode: u16,
    /// The reference ID of the corresponding sub-request.
    pub referenceId: String,
}