//
//  CloudKitDataProvider.swift
//  SportsTime
//
//  Wraps CloudKitService to conform to DataProvider protocol
//

import Foundation

actor CloudKitDataProvider: DataProvider {

    private let cloudKit = CloudKitService.shared

    // MARK: - Availability

    func checkAvailability() async throws {
        try await cloudKit.checkAvailabilityWithError()
    }

    // MARK: - DataProvider Protocol

    func fetchTeams(for sport: Sport) async throws -> [Team] {
        do {
            try await checkAvailability()
            return try await cloudKit.fetchTeams(for: sport)
        } catch {
            throw CloudKitError.from(error)
        }
    }

    func fetchAllTeams() async throws -> [Team] {
        do {
            try await checkAvailability()
            var allTeams: [Team] = []
            for sport in Sport.supported {
                let teams = try await cloudKit.fetchTeams(for: sport)
                allTeams.append(contentsOf: teams)
            }
            return allTeams
        } catch {
            throw CloudKitError.from(error)
        }
    }

    func fetchStadiums() async throws -> [Stadium] {
        do {
            try await checkAvailability()
            return try await cloudKit.fetchStadiums()
        } catch {
            throw CloudKitError.from(error)
        }
    }

    func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game] {
        do {
            try await checkAvailability()
            return try await cloudKit.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
        } catch {
            throw CloudKitError.from(error)
        }
    }

    func fetchGame(by id: UUID) async throws -> Game? {
        do {
            try await checkAvailability()
            return try await cloudKit.fetchGame(by: id)
        } catch {
            throw CloudKitError.from(error)
        }
    }

    func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame] {
        do {
            try await checkAvailability()

            // Fetch all required data
            async let gamesTask = cloudKit.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
            async let teamsTask = fetchAllTeamsInternal()
            async let stadiumsTask = cloudKit.fetchStadiums()

            let (games, teams, stadiums) = try await (gamesTask, teamsTask, stadiumsTask)

            let teamsById = Dictionary(uniqueKeysWithValues: teams.map { ($0.id, $0) })
            let stadiumsById = Dictionary(uniqueKeysWithValues: stadiums.map { ($0.id, $0) })

            return games.compactMap { game in
                guard let homeTeam = teamsById[game.homeTeamId],
                      let awayTeam = teamsById[game.awayTeamId],
                      let stadium = stadiumsById[game.stadiumId] else {
                    return nil
                }
                return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
            }
        } catch {
            throw CloudKitError.from(error)
        }
    }

    // Internal helper to avoid duplicate availability checks
    private func fetchAllTeamsInternal() async throws -> [Team] {
        var allTeams: [Team] = []
        for sport in Sport.supported {
            let teams = try await cloudKit.fetchTeams(for: sport)
            allTeams.append(contentsOf: teams)
        }
        return allTeams
    }
}