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

import Foundation
import ReviewsFoundationKit
import ReviewsFeedKit

struct GetReviewsAPIEndpoint: GetReviewsEndpoint {
    
    // MARK: Constants
    let host: URL
    let decoder: JSONDecoder
    let session: URLSession

    // MARK: Functions
    @discardableResult func callAsFunction(
        _ input: ReviewsFeedKit.GetReviewsInput
    ) async throws -> ReviewsFeedKit.GetReviewsOutput {
        let path = try makePath(with: input)
        let url = {
            if #available(iOS 16.0, *) {
                host.appending(path: path)
            } else {
                host.appendingPathComponent(path)
            }
        }()
        
        let (data, response) = try await session.data(from: url)
        
        guard let urlResponse = response as? HTTPURLResponse else {
            throw EndpointError.responseNotFound
        }

        guard urlResponse.statusCode == 200 else {
            throw EndpointError.requestFailed(statusCode: urlResponse.statusCode)
        }
        
        let feed = try decoder.decode(Feed.self, from: data)
        
        return .init(reviews: feed.entries)
    }
    
    func makePath(with input: GetReviewsInput) throws -> String {
        guard
            !input.appID.isEmpty,
            !input.countryCode.isEmpty
        else{
            throw EndpointError.inputParametersEmpty
        }

        return .init(
            format: .Format.recentReviewsPath,
            input.countryCode,
            input.appID
        )
    }
    
}

// MARK: - String+Formats
private extension String {
    enum Format {
        static let recentReviewsPath = "/%@/rss/customerreviews/id=%@/sortby=mostrecent/json"
    }
}