import AppKit
import VoiceCatCore

final class PermissionsSheet: NSViewController {

    var onComplete: ((Permissions?) -> Void)?

    private let targetNickname: String
    private let initial: Permissions

    private let canCreateTempChannelCB = NSButton(checkboxWithTitle: "Create temporary channels", target: nil, action: nil)
    private let canKickCB               = NSButton(checkboxWithTitle: "Kick users", target: nil, action: nil)
    private let canBanCB                = NSButton(checkboxWithTitle: "Ban users", target: nil, action: nil)
    private let canMoveUsersCB          = NSButton(checkboxWithTitle: "Move users between channels", target: nil, action: nil)
    private let canAdminAccountsCB      = NSButton(checkboxWithTitle: "Manage accounts", target: nil, action: nil)
    private let isAdminCB               = NSButton(checkboxWithTitle: "Full administrator", target: nil, action: nil)

    init(nickname: String, current: Permissions) {
        self.targetNickname = nickname
        self.initial = current
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) { fatalError() }

    override func loadView() {
        view = NSView(frame: NSRect(x: 0, y: 0, width: 340, height: 250))
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        buildUI()
        applyInitial()
    }

    private func buildUI() {
        let titleLabel = NSTextField(labelWithString: "Permissions — \(targetNickname)")
        titleLabel.font = .boldSystemFont(ofSize: 13)

        let checkboxes = [canCreateTempChannelCB, canKickCB, canBanCB,
                          canMoveUsersCB, canAdminAccountsCB, isAdminCB]
        for cb in checkboxes {
            cb.setAccessibilityLabel(cb.title)
        }

        let cancelButton = NSButton(title: "Cancel", target: self, action: #selector(cancelClicked))
        cancelButton.bezelStyle = .rounded

        let saveButton = NSButton(title: "Save", target: self, action: #selector(saveClicked))
        saveButton.bezelStyle = .rounded; saveButton.keyEquivalent = "\r"
        saveButton.setAccessibilityLabel("Save permissions for \(targetNickname)")

        let buttonRow = NSStackView(views: [NSView(), cancelButton, saveButton])
        buttonRow.orientation = .horizontal; buttonRow.spacing = 8

        var views: [NSView] = [titleLabel]
        views.append(contentsOf: checkboxes)
        views.append(buttonRow)

        let stack = NSStackView(views: views)
        stack.orientation = .vertical; stack.spacing = 8
        stack.alignment = .leading
        stack.edgeInsets = NSEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
        stack.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(stack)
        NSLayoutConstraint.activate([
            stack.topAnchor.constraint(equalTo: view.topAnchor),
            stack.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            stack.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            stack.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])
    }

    private func applyInitial() {
        canCreateTempChannelCB.state = initial.canCreateTempChannel ? .on : .off
        canKickCB.state             = initial.canKick              ? .on : .off
        canBanCB.state              = initial.canBan               ? .on : .off
        canMoveUsersCB.state        = initial.canMoveUsers         ? .on : .off
        canAdminAccountsCB.state    = initial.canAdminAccounts     ? .on : .off
        isAdminCB.state             = initial.isAdmin              ? .on : .off
    }

    @objc private func saveClicked() {
        let perms = Permissions(
            canCreateTempChannel: canCreateTempChannelCB.state == .on,
            canKick:              canKickCB.state              == .on,
            canBan:               canBanCB.state               == .on,
            canMoveUsers:         canMoveUsersCB.state         == .on,
            canAdminAccounts:     canAdminAccountsCB.state     == .on,
            isAdmin:              isAdminCB.state              == .on
        )
        dismiss(nil)
        onComplete?(perms)
    }

    @objc private func cancelClicked() {
        dismiss(nil)
        onComplete?(nil)
    }
}