//
//  MockURLProtocol.swift
//  ReviewsFoundationKit
//
//  Created by Javier Cicchelli on 17/03/2024.
//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
//

import Foundation

public class MockURLProtocol: URLProtocol {
    
    // MARK: Properties
    public static var response: Response?
    
    // MARK: Functions
    public override class func canInit(with task: URLSessionTask) -> Bool {
        true
    }
    
    public override class func canInit(with request: URLRequest) -> Bool {
        true
    }
    
    public override class func canonicalRequest(for request: URLRequest) -> URLRequest {
        request
    }
    
    public override func startLoading() {
        guard
            let url = request.url,
            let response = Self.response
        else {
            client?.urlProtocolDidFinishLoading(self)
            return
        }
        
        if let data = try? response.data {
            client?.urlProtocol(self, didLoad: data)
        }

        if let httpResponse = HTTPURLResponse(
            url: url,
            statusCode: response.statusCode,
            httpVersion: nil,
            headerFields: nil
        ) {
            client?.urlProtocol(
                self,
                didReceive: httpResponse,
                cacheStoragePolicy: .allowedInMemoryOnly
            )
        }
        
        client?.urlProtocolDidFinishLoading(self)
    }
    
    public override func stopLoading() {}
    
}

// MARK: - Structs

extension MockURLProtocol {
    public struct Response {
        
        // MARK: Constants
        public let statusCode: Int
        public let object: any Encodable
        
        // MARK: Initialisers
        public init(
            statusCode: Int,
            object: any Codable
        ) {
            self.statusCode = statusCode
            self.object = object
        }
        
        // MARK: Computed
        var data: Data? {
            get throws {
                try JSONEncoder().encode(object)
            }
        }

    }
}