import Foundation

public protocol SunoHandoffService: Sendable {
    func handOff(_ output: CompiledSunoOutput) async throws
}

public enum SunoHandoffDestination {
    public static let createPageURL = URL(string: "https://suno.com/create")!
}

public struct SunoHandoffPayload: Equatable, Sendable {
    public let title: String
    public let lyrics: String
    public let stylePrompt: String

    public init(title: String, lyrics: String, stylePrompt: String) {
        self.title = title
        self.lyrics = lyrics
        self.stylePrompt = stylePrompt
    }

    public func value(for field: SunoHandoffField) -> String {
        switch field {
        case .title:
            return title
        case .lyrics:
            return lyrics
        case .stylePrompt:
            return stylePrompt
        }
    }
}

public enum SunoHandoffField: String, CaseIterable, Equatable, Identifiable, Sendable {
    case title
    case lyrics
    case stylePrompt

    public var id: String { rawValue }

    public var displayName: String {
        switch self {
        case .title:
            return "Title"
        case .lyrics:
            return "Lyrics"
        case .stylePrompt:
            return "Style prompt"
        }
    }
}

public enum SunoFieldFillResult: Equatable, Sendable {
    case filled
    case copyRequired(String)
}

public struct SunoFieldFillReport: Equatable, Sendable {
    public let results: [SunoHandoffField: SunoFieldFillResult]

    public init(results: [SunoHandoffField: SunoFieldFillResult]) {
        self.results = results
    }

    public static func copyRequired(for fields: [SunoHandoffField], reason: String) -> SunoFieldFillReport {
        SunoFieldFillReport(results: Dictionary(uniqueKeysWithValues: fields.map { ($0, .copyRequired(reason)) }))
    }
}

public protocol SunoFieldFilling: Sendable {
    func fill(_ payload: SunoHandoffPayload) async -> SunoFieldFillReport
}