import Foundation

enum APIError: Error, LocalizedError {
    case unauthorized, networkError, decodingError
    var errorDescription: String? {
        switch self {
        case .unauthorized: return "Неверный email или пароль"
        case .networkError: return "Ошибка сети"
        case .decodingError: return "Ошибка данных"
        }
    }
}

class APIService {
    static let shared = APIService()
    let baseURL = "https://health.digital-home.site"

    func login(email: String, password: String) async throws -> LoginResponse {
        let url = URL(string: "\(baseURL)/api/auth/login")!
        var req = URLRequest(url: url)
        req.httpMethod = "POST"
        req.setValue("application/json", forHTTPHeaderField: "Content-Type")
        req.httpBody = try JSONEncoder().encode(LoginRequest(email: email, password: password))
        let (data, response) = try await URLSession.shared.data(for: req)
        guard let r = response as? HTTPURLResponse, r.statusCode == 200 else { throw APIError.unauthorized }
        return try JSONDecoder().decode(LoginResponse.self, from: data)
    }

    func getProfile(token: String) async throws -> ProfileResponse {
        let url = URL(string: "\(baseURL)/api/profile")!
        var req = URLRequest(url: url)
        req.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
        let (data, _) = try await URLSession.shared.data(for: req)
        return try JSONDecoder().decode(ProfileResponse.self, from: data)
    }

    func getReadiness(token: String) async throws -> ReadinessResponse {
        let url = URL(string: "\(baseURL)/api/health/readiness")!
        var req = URLRequest(url: url)
        req.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
        let (data, _) = try await URLSession.shared.data(for: req)
        return try JSONDecoder().decode(ReadinessResponse.self, from: data)
    }

    func getLatest(token: String) async throws -> LatestHealthResponse {
        let url = URL(string: "\(baseURL)/api/health/latest")!
        var req = URLRequest(url: url)
        req.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
        let (data, _) = try await URLSession.shared.data(for: req)
        return try JSONDecoder().decode(LatestHealthResponse.self, from: data)
    }
}