//
//  TerminalScrollModifiers.swift
//  libghostty-spm
//
//  Created by Lakr233 on 2026/3/16.
//

import GhosttyKit

#if canImport(AppKit) && !canImport(UIKit)
    import AppKit
#endif

public struct TerminalScrollModifiers: Sendable {
    public let rawValue: ghostty_input_scroll_mods_t

    public init(rawValue: ghostty_input_scroll_mods_t = 0) {
        self.rawValue = rawValue
    }

    public init(precision: Bool, momentum: Momentum = .none) {
        var value: Int32 = 0
        if precision { value |= 1 }
        value |= momentum.rawValue << 1
        rawValue = value
    }

    public var precision: Bool {
        (rawValue & 1) != 0
    }

    public var momentum: Momentum {
        Momentum(rawValue: (rawValue >> 1) & 0x3) ?? .none
    }

    public enum Momentum: Int32, Sendable {
        case none = 0
        case began = 1
        case stationary = 2
        case changed = 3
    }

    #if canImport(AppKit) && !canImport(UIKit)
        static func momentumFrom(phase: NSEvent.Phase) -> Momentum {
            if phase.contains(.began) { return .began }
            if phase.contains(.stationary) { return .stationary }
            if phase.contains(.changed) { return .changed }
            return .none
        }
    #endif
}