//
//  GestureMap.swift
//  Focale
//
//  Author: Simon-Pierre Boucher
//  Contact: contact@spboucher.ai
//
//  Fully reassignable gesture → control mapping (CLAUDE.md §6):
//  left vertical drag = ISO, horizontal = exposure, etc.
//

import Foundation

/// A gesture slot on the capture screen that can drive a control.
enum GestureSlot: String, Codable, Sendable, CaseIterable, Identifiable {
    case leftVerticalDrag
    case rightVerticalDrag
    case horizontalDrag
    case pinch

    var id: String { rawValue }

    /// User-facing label, in French.
    var displayName: String {
        switch self {
        case .leftVerticalDrag: "Glissement vertical gauche"
        case .rightVerticalDrag: "Glissement vertical droit"
        case .horizontalDrag: "Glissement horizontal"
        case .pinch: "Pincement"
        }
    }
}

struct GestureMap: Codable, Sendable {
    private var assignments: [GestureSlot.RawValue: CaptureControl.RawValue]

    init(_ assignments: [GestureSlot: CaptureControl]) {
        self.assignments = Dictionary(
            uniqueKeysWithValues: assignments.map { ($0.key.rawValue, $0.value.rawValue) }
        )
    }

    func control(for slot: GestureSlot) -> CaptureControl? {
        assignments[slot.rawValue].flatMap(CaptureControl.init(rawValue:))
    }

    mutating func assign(_ control: CaptureControl?, to slot: GestureSlot) {
        assignments[slot.rawValue] = control?.rawValue
    }

    static let standard = GestureMap([
        .leftVerticalDrag: .iso,
        .rightVerticalDrag: .shutterSpeed,
        .horizontalDrag: .exposureBias,
        .pinch: .zoom,
    ])
}