import Foundation

/// 固件信息
public struct FirmwareInfo: Codable, Equatable, Sendable {
    public let version: String
    public let fileUrl: String
    public let description: String?
    public let fileSize: String?
    public let fileMd5: String?
    public let identifier: String?
    public let status: String?
}

struct FirmwareResponse: Codable {
    let success: Bool
    let data: FirmwareInfo?
}

/// 固件服务内部实现
final class FirmwareService {
    private let config: DuooomiBleConfig
    private let latestPath = "api/auth/loomart/firmware/latest-published"

    init(config: DuooomiBleConfig) {
        self.config = config
    }

    func fetchLatest(identifier: String? = nil, status: String? = nil) async throws -> FirmwareInfo? {
        let id = (identifier ?? config.firmwareIdentifier).trimmingCharacters(in: .whitespacesAndNewlines)
        let st = status ?? config.firmwareStatus
        guard !id.isEmpty else {
            throw DuooomiBleError.transferFailed("Invalid firmware identifier")
        }

        var comps = URLComponents(url: config.apiHost.appendingPathComponent(latestPath), resolvingAgainstBaseURL: false)!
        comps.queryItems = [
            URLQueryItem(name: "identifier", value: id),
            URLQueryItem(name: "status", value: st)
        ]
        guard let url = comps.url else {
            throw DuooomiBleError.transferFailed("Invalid firmware URL")
        }

        var req = URLRequest(url: url)
        req.httpMethod = "GET"
        req.setValue(config.apiKey, forHTTPHeaderField: "x-api-key")
        req.setValue("application/json", forHTTPHeaderField: "accept")

        let (data, resp) = try await URLSession.shared.data(for: req)
        guard let http = resp as? HTTPURLResponse else {
            throw DuooomiBleError.transferFailed("Invalid response")
        }
        guard (200...299).contains(http.statusCode) else {
            throw DuooomiBleError.transferFailed("HTTP \(http.statusCode)")
        }

        let decoded = try JSONDecoder().decode(FirmwareResponse.self, from: data)
        return decoded.data
    }
}