import Foundation

public struct StructuredSongProjectUpdateResponse: Codable, Equatable, Sendable {
    public static let schemaName = "song_project_update_response"

    public var project: SongProjectSnapshot
    public var changedScopes: [SongProjectUpdateScope]
    public var notes: [String]
    public var followUpQuestions: [String]

    public init(
        project: SongProjectSnapshot,
        changedScopes: [SongProjectUpdateScope] = [],
        notes: [String] = [],
        followUpQuestions: [String] = []
    ) {
        self.project = project
        self.changedScopes = changedScopes
        self.notes = notes
        self.followUpQuestions = followUpQuestions
    }

    public func makeUpdateResult(
        updating existingProject: SongProject,
        updatedAt: Date = Date()
    ) -> SongProjectUpdateResult {
        SongProjectAIUpdateMerger().apply(
            snapshot: project,
            changedScopes: changedScopes,
            notes: notes,
            followUpQuestions: followUpQuestions,
            to: existingProject,
            updatedAt: updatedAt
        )
    }
}