//
//  YahooAPIClient.swift
//  FantasyWatch
//
//  Created by Claude Code
//

import Foundation

final class YahooAPIClient {
    private let networkService: NetworkService
    private let oauthManager: OAuthManager
    private let baseURL = "https://fantasysports.yahooapis.com/fantasy/v2"

    init(
        networkService: NetworkService = DefaultNetworkService(),
        oauthManager: OAuthManager
    ) {
        self.networkService = networkService
        self.oauthManager = oauthManager
    }

    func getUserTeams() async throws -> [Team] {
        let token = try await oauthManager.validToken()
        let data = try await networkService.request(
            YahooEndpoint.userTeams,
            baseURL: baseURL,
            bearerToken: token
        )

        // NOTE: Yahoo API returns XML by default, even with format=json parameter
        // For POC, we will need to parse the actual XML response
        // This is a placeholder that will need proper XML parsing implementation
        // based on the actual Yahoo API response structure

        // For now, return mock data structure
        // TODO: Implement proper XML parsing once we have real API responses
        return try parseTeamsFromXML(data)
    }

    func getMatchup(teamKey: String) async throws -> Matchup {
        let token = try await oauthManager.validToken()
        let data = try await networkService.request(
            YahooEndpoint.matchup(teamKey: teamKey),
            baseURL: baseURL,
            bearerToken: token
        )

        return try parseMatchupFromXML(data)
    }

    func getRoster(teamKey: String) async throws -> RosterStatus {
        let token = try await oauthManager.validToken()
        let data = try await networkService.request(
            YahooEndpoint.roster(teamKey: teamKey),
            baseURL: baseURL,
            bearerToken: token
        )

        return try parseRosterFromXML(data)
    }

    // MARK: - XML Parsing Helpers

    private func parseTeamsFromXML(_ data: Data) throws -> [Team] {
        // TODO: Implement proper XML parsing
        // This is a placeholder for POC
        // The actual implementation will parse the Yahoo XML response structure
        throw NetworkError.decodingError(
            NSError(domain: "YahooAPI", code: -1, userInfo: [NSLocalizedDescriptionKey: "XML parsing not yet implemented"])
        )
    }

    private func parseMatchupFromXML(_ data: Data) throws -> Matchup {
        // TODO: Implement proper XML parsing
        // This is a placeholder for POC
        throw NetworkError.decodingError(
            NSError(domain: "YahooAPI", code: -1, userInfo: [NSLocalizedDescriptionKey: "XML parsing not yet implemented"])
        )
    }

    private func parseRosterFromXML(_ data: Data) throws -> RosterStatus {
        // TODO: Implement proper XML parsing
        // This is a placeholder for POC
        throw NetworkError.decodingError(
            NSError(domain: "YahooAPI", code: -1, userInfo: [NSLocalizedDescriptionKey: "XML parsing not yet implemented"])
        )
    }
}