import Foundation
import Observation

/// `repo log`: the default branch's history, signature verdict per commit.
@Observable
@MainActor
final class LogViewModel {

    private(set) var state: LoadState<[Commit]> = .loading

    private let client: GitbayClient
    let repoPath: String
    /// nil reads the default branch, as the command does.
    let ref: String?
    /// Set to follow one file's history, as the blob page does.
    let path: String?

    init(client: GitbayClient, repoPath: String, ref: String? = nil, path: String? = nil) {
        self.client = client
        self.repoPath = repoPath
        self.ref = ref
        self.path = path
    }

    func load() async {
        var argv = ["repo", "log", repoPath]
        if let ref { argv.append(contentsOf: ["--ref", ref]) }
        if let path { argv.append(contentsOf: ["--path", path]) }
        do {
            let commits = try await client.readList(argv, of: Commit.self)
            state = commits.isEmpty ? .empty("No commits yet.") : .loaded(commits)
        } catch {
            state = .from(error)
        }
    }
}