import Foundation
import SwiftUI
import UIKit

struct GitRepository: Identifiable, Codable {
    var id: String { name }
    let name: String; let branch: String; let head: String
    let status: String; let remotes: [GitRemote]
}
struct GitRemote: Codable {
    let name: String; let url: String; let fetch: Bool; let push: Bool
}
struct GitFileStatus: Identifiable, Codable {
    var id: String { path }
    let name: String; let path: String; let status: String; let kind: String

    var statusIcon: String {
        switch status {
        case "modified":  return "pencil.circle.fill"
        case "added":     return "plus.circle.fill"
        case "deleted":   return "minus.circle.fill"
        case "untracked": return "questionmark.circle.fill"
        default:          return "circle"
        }
    }
    var statusSwiftUIColor: Color {
        switch status {
        case "modified":  return .orange
        case "added":     return .green
        case "deleted":   return .red
        case "untracked": return .secondary
        default:          return .primary
        }
    }
}
struct GitCommit: Identifiable, Codable {
    var id: String { commitId }
    let summary: String; let commitId: String; let author: String
    let timestamp: String; let description: String
    var shortId: String { String(commitId.prefix(7)) }
    var formattedDate: String {
        let iso = ISO8601DateFormatter()
        iso.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
        guard let d = iso.date(from: timestamp) else { return timestamp }
        let f = RelativeDateTimeFormatter(); f.unitsStyle = .abbreviated
        return f.localizedString(for: d, relativeTo: Date())
    }
    enum CodingKeys: String, CodingKey {
        case summary, author, timestamp, description; case commitId = "id"
    }
}
struct GitBranch: Identifiable, Codable {
    var id: String { name }
    let name: String; let head: String; let latest: String
    var isRemote: Bool { name.hasPrefix("origin/") }
    var localName: String { name.replacingOccurrences(of: "origin/", with: "") }
}

@MainActor
final class GitStore: ObservableObject {
    @Published var repositories:    [GitRepository]  = []
    @Published var activeRepo:      String           = ""
    @Published var currentBranch:   String           = "main"
    @Published var fileStatuses:    [GitFileStatus]  = []
    @Published var commitLog:       [GitCommit]      = []
    @Published var branches:        [GitBranch]      = []
    @Published var isWorkingCopyInstalled = false
    @Published var pendingOperation: String?
    @Published var lastError: String?

    func checkInstallation() {
        isWorkingCopyInstalled = UIApplication.shared.canOpenURL(
            URL(string: "working-copy://")!
        )
    }
}