import AppKit

@MainActor
final class SettingsWindowController: NSWindowController {
    static let shared = SettingsWindowController()

    private let keyField = NSSecureTextField()
    private let glossaryField = NSTextField()
    private let modelPopup = NSPopUpButton()
    private let fillerCheckbox = NSButton(checkboxWithTitle: "Удалять «э», «эм», «как бы», «короче»", target: nil, action: nil)

    private init() {
        let window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 560, height: 300),
            styleMask: [.titled, .closable],
            backing: .buffered,
            defer: false
        )
        window.title = "Настройки WhisperKey"
        window.center()
        super.init(window: window)
        buildUI()
    }

    required init?(coder: NSCoder) { nil }

    func show() {
        loadValues()
        showWindow(nil)
        NSApp.activate(ignoringOtherApps: true)
    }

    private func buildUI() {
        guard let content = window?.contentView else { return }
        let grid = NSGridView(views: [
            [label("OpenAI API key"), keyField],
            [label("Облачная модель"), modelPopup],
            [label("Словарь терминов"), glossaryField],
            [NSView(), fillerCheckbox],
        ])
        grid.translatesAutoresizingMaskIntoConstraints = false
        grid.rowSpacing = 14
        grid.columnSpacing = 16
        grid.column(at: 0).xPlacement = .trailing
        modelPopup.addItems(withTitles: ["gpt-4o-transcribe", "gpt-4o-mini-transcribe", "whisper-1"])

        let note = NSTextField(wrappingLabelWithString: "F5 — локально, подтверждённый текст появляется по мере речи. Option+F5 — OpenAI с обычными крупными фрагментами. После 5 секунд тишины запись завершается автоматически.")
        note.textColor = .secondaryLabelColor
        note.translatesAutoresizingMaskIntoConstraints = false
        let save = NSButton(title: "Сохранить", target: self, action: #selector(save))
        save.keyEquivalent = "\r"
        save.translatesAutoresizingMaskIntoConstraints = false
        content.addSubview(grid)
        content.addSubview(note)
        content.addSubview(save)
        NSLayoutConstraint.activate([
            grid.leadingAnchor.constraint(equalTo: content.leadingAnchor, constant: 24),
            grid.trailingAnchor.constraint(equalTo: content.trailingAnchor, constant: -24),
            grid.topAnchor.constraint(equalTo: content.topAnchor, constant: 28),
            note.leadingAnchor.constraint(equalTo: content.leadingAnchor, constant: 24),
            note.trailingAnchor.constraint(equalTo: content.trailingAnchor, constant: -24),
            note.topAnchor.constraint(equalTo: grid.bottomAnchor, constant: 24),
            save.trailingAnchor.constraint(equalTo: content.trailingAnchor, constant: -24),
            save.bottomAnchor.constraint(equalTo: content.bottomAnchor, constant: -20),
        ])
    }

    private func label(_ value: String) -> NSTextField {
        NSTextField(labelWithString: value)
    }

    private func loadValues() {
        let settings = AppSettings.shared
        keyField.stringValue = settings.apiKey() ?? ""
        glossaryField.stringValue = settings.glossary
        modelPopup.selectItem(withTitle: settings.cloudModel)
        fillerCheckbox.state = settings.removeFillers ? .on : .off
    }

    @objc private func save() {
        do {
            let settings = AppSettings.shared
            if !keyField.stringValue.isEmpty { try settings.saveAPIKey(keyField.stringValue) }
            settings.glossary = glossaryField.stringValue
            settings.cloudModel = modelPopup.titleOfSelectedItem ?? "gpt-4o-transcribe"
            settings.removeFillers = fillerCheckbox.state == .on
            window?.close()
        } catch {
            let alert = NSAlert(error: error)
            alert.runModal()
        }
    }
}