import AppKit

/// AppleScript-facing wrapper around a live Ghostty terminal surface.
///
/// This class is intentionally ObjC-visible because Cocoa scripting resolves
/// AppleScript objects through Objective-C runtime names/selectors, not Swift
/// protocol conformance.
///
/// Mapping from `Ghostty.sdef`:
/// - `class terminal` -> this class (`@objc(GhosttyAppleScriptTerminal)`).
/// - `property id` -> `@objc(id)` getter below.
/// - `property title` -> `@objc(title)` getter below.
/// - `property working directory` -> `@objc(workingDirectory)` getter below.
///
/// We keep only a weak reference to the underlying `SurfaceView` so this
/// wrapper never extends the terminal's lifetime.
@MainActor
@objc(GhosttyScriptTerminal)
final class ScriptTerminal: NSObject {
    /// Weak reference to the underlying surface. Package-visible so that
    /// other AppleScript command handlers (e.g. `ScriptSplitCommand`) can
    /// access the live surface without exposing it to ObjC/AppleScript.
    weak var surfaceView: Ghostty.SurfaceView?

    init(surfaceView: Ghostty.SurfaceView) {
        self.surfaceView = surfaceView
    }

    /// Exposed as the AppleScript `id` property.
    ///
    /// This is a stable UUID string for the life of a surface and is also used
    /// by `NSUniqueIDSpecifier` to re-identify a terminal object in scripts.
    @objc(id)
    var stableID: String {
        guard NSApp.isAppleScriptEnabled else { return "" }
        return surfaceView?.id.uuidString ?? ""
    }

    /// Exposed as the AppleScript `title` property.
    @objc(title)
    var title: String {
        guard NSApp.isAppleScriptEnabled else { return "" }
        return surfaceView?.title ?? ""
    }

    /// Exposed as the AppleScript `working directory` property.
    ///
    /// The `sdef` uses a spaced name, but Cocoa scripting maps that to the
    /// camel-cased selector name `workingDirectory`.
    @objc(workingDirectory)
    var workingDirectory: String {
        guard NSApp.isAppleScriptEnabled else { return "" }
        return surfaceView?.pwd ?? ""
    }

    /// Used by command handling (`perform action ... on <terminal>`).
    func perform(action: String) -> Bool {
        guard NSApp.isAppleScriptEnabled else { return false }
        guard let surfaceModel = surfaceView?.surfaceModel else { return false }
        return surfaceModel.perform(action: action)
    }

    /// Provides Cocoa scripting with a canonical "path" back to this object.
    ///
    /// Without an object specifier, returned terminal objects can't be reliably
    /// referenced in follow-up script statements because AppleScript cannot
    /// express where the object came from (`application.terminals[id]`).
    override var objectSpecifier: NSScriptObjectSpecifier? {
        guard NSApp.isAppleScriptEnabled else { return nil }
        guard let appClassDescription = NSApplication.shared.classDescription as? NSScriptClassDescription else {
            return nil
        }

        return NSUniqueIDSpecifier(
            containerClassDescription: appClassDescription,
            containerSpecifier: nil,
            key: "terminals",
            uniqueID: stableID
        )
    }
}