// dingger menu bar: herdr's agent panel as a macOS status item, plus a
// floating always-on-top panel (panel.swift) and agent search (search.swift),
// each on a global shortcut (hotkey.swift). Rows and colors come from
// model.swift.
//
// Reads the pane options the dingger daemon writes and renders herdr's
// Symbols style with herdr's palette:
//
//   blocked × red   done ✓ teal   working ◐ yellow   idle ○ green
//
// in herdr's priority order, oldest waiting first. Clicking a row runs
// `dingger focus --pane`, the same tested code path as the tmux status-line
// click.
//
// Debug flags (used by tests/e2e.sh):
//   --print          print the title and rows the menu would show, then exit
//                    (rows: "<symbol> <status>\t<title>\t<subtitle>")
//   --print-panel [--full] [--toggle]
//                    print what the floating panel would show, then exit
//   --snapshot-panel <png> [--full]
//                    render the panel offscreen (after a different render, to
//                    catch stale content) over white and black, then exit
//   --print-search <query>
//                    print what agent search would list for <query>, then exit
//   --snapshot-search <png> <query> [<down>]
//                    render agent search offscreen, then exit
//   --click <pane>   perform a row click for <pane>, then exit
//   --selftest       check the panel and search rules, then exit

import AppKit

func log(_ message: String) {
    FileHandle.standardError.write(Data("\(Date()) \(message)\n".utf8))
}

final class Menubar: NSObject, NSApplicationDelegate, NSMenuDelegate {
    private let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
    private let menu = NSMenu()
    private var panel: PanelController!
    private var searchWindow: SearchController!
    private var visibility = Menubar.loadVisibility()
    private var settings = Settings()
    private var settingsModified: Date?
    private var hotkey: Hotkey?
    private var hotkeyRegistered = false
    private var jumpHotkey: Hotkey?
    private var jumpHotkeyRegistered = false
    private var searchHotkey: Hotkey?
    private var searchHotkeyRegistered = false
    private var prefersFull = UserDefaults.standard.bool(forKey: "panelFull")
    private var rows: [Row] = []

    /// The panel settings; the first run after the on/off split migrates the
    /// old three-way mode.
    private static func loadVisibility() -> PanelVisibility {
        let defaults = UserDefaults.standard
        guard defaults.object(forKey: "panelEnabled") != nil else {
            let migrated = PanelVisibility.migrated(fromMode: defaults.string(forKey: "panelMode") ?? "auto")
            defaults.set(migrated.enabled, forKey: "panelEnabled")
            defaults.set(migrated.policy.rawValue, forKey: "panelPolicy")
            defaults.removeObject(forKey: "panelMode")
            return migrated
        }
        return PanelVisibility(
            enabled: defaults.bool(forKey: "panelEnabled"),
            policy: PanelPolicy(rawValue: defaults.string(forKey: "panelPolicy") ?? "") ?? .whenWaiting)
    }

    func applicationDidFinishLaunching(_: Notification) {
        menu.delegate = self
        item.menu = menu
        panel = PanelController(
            onClick: { [weak self] paneId in self?.jump(to: paneId) },
            onToggleFull: { [weak self] in self?.toggleFull() })
        searchWindow = SearchController(onJump: { [weak self] paneId in self?.jump(to: paneId) })
        Settings.ensureFile()
        reloadSettings()
        refresh()
        let timer = Timer(timeInterval: 1.0, repeats: true) { [weak self] _ in self?.refresh() }
        RunLoop.main.add(timer, forMode: .common)
    }

    // MARK: settings and shortcut

    private func reloadSettings() {
        settingsModified = Settings.modified()
        settings = Settings.load()
        (hotkey, hotkeyRegistered) = registerShortcut(.panel, settings.hotkey, "panel") { [weak self] in
            self?.togglePanel()
        }
        (jumpHotkey, jumpHotkeyRegistered) = registerShortcut(.jump, settings.jumpHotkey, "jump") {
            [weak self] in self?.jumpToTopWaiting()
        }
        (searchHotkey, searchHotkeyRegistered) = registerShortcut(.search, settings.searchHotkey, "search") {
            [weak self] in self?.toggleSearch()
        }
    }

    private func registerShortcut(_ id: GlobalHotkey.Id, _ spec: String, _ name: String,
                                  action: @escaping () -> Void) -> (Hotkey?, Bool) {
        guard let parsed = Hotkey.parse(spec) else {
            GlobalHotkey.unregister(id)
            log("settings: invalid \(name) shortcut \"\(spec)\"")
            return (nil, false)
        }
        let registered = GlobalHotkey.register(id, parsed, action: action)
        log("settings: \(name) shortcut \(parsed.display) \(registered ? "registered" : "in use by another app")")
        return (parsed, registered)
    }

    // MARK: refresh

    private func refresh() {
        if Settings.modified() != settingsModified { reloadSettings() }
        rows = fetchRows()
        item.button?.attributedTitle = title(for: rows)
        var tip: [String] = []
        for status in [Status.blocked, .done, .working, .idle] {
            let count = rows.filter { $0.status == status }.count
            if count > 0 { tip.append("\(count) \(status.rawValue)") }
        }
        let tipText = tip.isEmpty ? "No agents" : tip.joined(separator: " · ")
        item.button?.toolTip = tipText
        item.button?.setAccessibilityLabel("dingger, " + tipText)

        visibility.anyWaiting = rows.contains(where: \.waiting)
        applyPanel()
        searchWindow.update(rows: rows)
    }

    /// The search shortcut and menu item: open agent search, or close it.
    @objc private func toggleSearch() {
        if searchWindow.isOpen {
            searchWindow.close("shortcut")
        } else {
            rows = fetchRows()
            searchWindow.open(rows: rows)
        }
    }

    private var panelContent: PanelContent {
        PanelContent(rows: rows,
                     full: panelShowsFull(policy: visibility.policy, prefersFull: prefersFull),
                     canToggle: visibility.policy == .always)
    }

    private func applyPanel() {
        if visibility.visible(at: Date()) {
            if panel.render(panelContent) {
                let content = panelContent
                log("panel: render \(content.rows.filter(\.waiting).count) waiting, \(content.full ? "full" : "compact")")
            }
            if !panel.isVisible {
                panel.show()
                log("panel: shown (\(panelState))")
            }
        } else if panel.isVisible {
            panel.hide()
            log("panel: hidden (\(panelState))")
        }
    }

    private var panelState: String {
        "\(visibility.enabled ? "on" : "off"), \(visibility.policy.rawValue), "
            + (visibility.anyWaiting ? "agents waiting" : "nothing waiting")
    }

    /// The shortcut and the menu item: turn the panel on or off, persistently.
    @objc private func togglePanel() {
        visibility.toggle(at: Date())
        UserDefaults.standard.set(visibility.enabled, forKey: "panelEnabled")
        log("panel: turned \(visibility.enabled ? "on" : "off")")
        applyPanel()
    }

    private func toggleFull() {
        prefersFull.toggle()
        UserDefaults.standard.set(prefersFull, forKey: "panelFull")
        applyPanel()
    }

    /// The jump shortcut: same as clicking the tmux status line.
    @objc private func jumpToTopWaiting() {
        DispatchQueue.global().async {
            let result = runReporting(dinggerBinary, ["focus"])
            log("jump: dingger focus \(result.ok ? "ok" : "failed: \(result.output)")")
            DispatchQueue.main.async { self.refresh() }
        }
    }

    @objc private func selectPolicy(_ sender: NSMenuItem) {
        guard let raw = sender.representedObject as? String, let policy = PanelPolicy(rawValue: raw) else { return }
        visibility.policy = policy
        UserDefaults.standard.set(policy.rawValue, forKey: "panelPolicy")
        applyPanel()
    }

    @objc private func openSettings() {
        Settings.ensureFile()
        _ = run("/usr/bin/open", ["-t", Settings.path])
    }

    private func jump(to paneId: String) {
        log("jump: to \(paneId)")
        DispatchQueue.global().async {
            focus(paneId)
            DispatchQueue.main.async { self.refresh() }
        }
    }

    // MARK: menu (rebuilt from fresh data every time it opens)

    func menuNeedsUpdate(_ menu: NSMenu) {
        menu.removeAllItems()
        rows = fetchRows()
        if rows.isEmpty {
            let none = NSMenuItem(title: "No agents", action: nil, keyEquivalent: "")
            none.isEnabled = false
            menu.addItem(none)
        }
        for (index, row) in rows.enumerated() {
            // One separator between the agents waiting for you and the rest.
            if index > 0, rows[index - 1].waiting, !row.waiting {
                menu.addItem(.separator())
            }
            let entry = NSMenuItem(title: row.label, action: #selector(rowClicked(_:)), keyEquivalent: "")
            entry.target = self
            entry.attributedTitle = rowTitle(row)
            entry.subtitle = row.subtitle
            entry.toolTip = row.name.isEmpty ? nil : row.name
            entry.representedObject = row.paneId
            menu.addItem(entry)
        }

        menu.addItem(.separator())
        let toggle = NSMenuItem(title: "Show Panel", action: #selector(togglePanel), keyEquivalent: "")
        toggle.target = self
        toggle.state = visibility.enabled ? .on : .off
        if let hotkey, hotkeyRegistered {
            toggle.keyEquivalent = hotkey.key.count == 1 ? hotkey.key : ""
            toggle.keyEquivalentModifierMask = hotkey.modifierFlags
        }
        menu.addItem(toggle)

        let jumpItem = NSMenuItem(title: "Jump to Waiting Agent", action: #selector(jumpToTopWaiting),
                                  keyEquivalent: "")
        jumpItem.target = self
        jumpItem.isEnabled = rows.contains(where: \.waiting)
        if let jumpHotkey, jumpHotkeyRegistered {
            jumpItem.keyEquivalent = jumpHotkey.key.count == 1 ? jumpHotkey.key : ""
            jumpItem.keyEquivalentModifierMask = jumpHotkey.modifierFlags
        }
        menu.addItem(jumpItem)

        let searchItem = NSMenuItem(title: "Search Agents…", action: #selector(toggleSearch), keyEquivalent: "")
        searchItem.target = self
        searchItem.isEnabled = !rows.isEmpty
        if let searchHotkey, searchHotkeyRegistered {
            searchItem.keyEquivalent = searchHotkey.key.count == 1 ? searchHotkey.key : ""
            searchItem.keyEquivalentModifierMask = searchHotkey.modifierFlags
        }
        menu.addItem(searchItem)

        let policyMenu = NSMenu()
        for policy in PanelPolicy.allCases {
            let option = NSMenuItem(title: policy.label, action: #selector(selectPolicy(_:)), keyEquivalent: "")
            option.target = self
            option.representedObject = policy.rawValue
            option.state = visibility.policy == policy ? .on : .off
            policyMenu.addItem(option)
        }
        let policyItem = NSMenuItem(title: "Panel Shows", action: nil, keyEquivalent: "")
        policyItem.submenu = policyMenu
        menu.addItem(policyItem)

        for (shortcut, registered, spec) in [(hotkey, hotkeyRegistered, settings.hotkey),
                                             (jumpHotkey, jumpHotkeyRegistered, settings.jumpHotkey),
                                             (searchHotkey, searchHotkeyRegistered, settings.searchHotkey)] {
            guard !registered else { continue }
            let problem = shortcut.map { "Shortcut \($0.display) is used by another app" }
                ?? "Shortcut \"\(spec)\" is not valid"
            let item = NSMenuItem(title: problem, action: nil, keyEquivalent: "")
            item.isEnabled = false
            menu.addItem(item)
        }
        let settingsItem = NSMenuItem(title: "Settings…", action: #selector(openSettings), keyEquivalent: ",")
        settingsItem.target = self
        menu.addItem(settingsItem)

        menu.addItem(.separator())
        menu.addItem(NSMenuItem(title: "Quit dingger", action: #selector(NSApplication.terminate(_:)),
                                keyEquivalent: "q"))
    }

    @objc private func rowClicked(_ sender: NSMenuItem) {
        guard let paneId = sender.representedObject as? String else { return }
        jump(to: paneId)
    }
}

let arguments = CommandLine.arguments
if arguments.contains("--selftest") {
    var failures = panelSelftest() + searchSelftest()
    if Hotkey.parse("ctrl+opt+cmd+e")?.display != "⌃⌥⌘E" { failures.append("hotkey: parse ctrl+opt+cmd+e") }
    if Hotkey.parse("e") != nil { failures.append("hotkey: a key without modifiers is rejected") }
    if Hotkey.parse("ctrl+opt+bogus") != nil { failures.append("hotkey: unknown keys are rejected") }
    if Hotkey.parse("cmd+shift+f12")?.display != "⇧⌘F12" { failures.append("hotkey: parse cmd+shift+f12") }
    if Hotkey.parse(Settings().jumpHotkey)?.display != "⌃⌥⌘U" { failures.append("hotkey: default jump is ⌃⌥⌘U") }
    if Hotkey.parse(Settings().searchHotkey)?.display != "⌃⌥⇧⌘U" { failures.append("hotkey: default search is ⌃⌥⇧⌘U") }
    failures.forEach { print("FAIL \($0)") }
    print(failures.isEmpty ? "selftest ok" : "selftest: \(failures.count) failed")
    exit(failures.isEmpty ? 0 : 1)
}
if arguments.contains("--print") {
    let rows = fetchRows()
    print("title: \(plainTitle(for: rows))")
    for row in rows {
        print("\(row.status.symbol) \(row.status.rawValue)\t\(row.label)\t\(row.subtitle)")
    }
    exit(0)
}
if arguments.contains("--print-panel") {
    let full = arguments.contains("--full")
    print(PanelContent(rows: fetchRows(), full: full, canToggle: full || arguments.contains("--toggle")).plainText)
    exit(0)
}
if let index = arguments.firstIndex(of: "--snapshot-panel"), index + 1 < arguments.count {
    _ = NSApplication.shared
    let controller = PanelController(persistFrame: false, onClick: { _ in }, onToggleFull: {})
    // First render something else, so stale views would show in the image.
    controller.render(PanelContent(rows: [Row(
        paneId: "%stale", agent: "pi", name: "STALE ROW FROM A PREVIOUS RENDER", status: .blocked,
        session: "old", window: "old", since: 0)]))
    let full = arguments.contains("--full")
    controller.render(PanelContent(rows: fetchRows(), full: full, canToggle: full))
    exit(controller.snapshot(to: arguments[index + 1]) ? 0 : 1)
}
if let index = arguments.firstIndex(of: "--print-search") {
    var state = SearchState(rows: fetchRows())
    state.setQuery(index + 1 < arguments.count ? arguments[index + 1] : "")
    print(state.plainText)
    exit(0)
}
if let index = arguments.firstIndex(of: "--snapshot-search"), index + 2 < arguments.count {
    _ = NSApplication.shared
    let controller = SearchController(onJump: { _ in })
    let down = index + 3 < arguments.count ? Int(arguments[index + 3]) ?? 0 : 0
    exit(controller.snapshot(rows: fetchRows(), query: arguments[index + 2], down: down,
                             to: arguments[index + 1]) ? 0 : 1)
}
if let index = arguments.firstIndex(of: "--click"), index + 1 < arguments.count {
    focus(arguments[index + 1])
    exit(0)
}

let app = NSApplication.shared
let delegate = Menubar()
app.delegate = delegate
app.setActivationPolicy(.accessory)
app.run()