import SwiftUI
import AppKit

// MARK: - Networks (globe in the header)
//
// BroV is the remote for the network core (mihomo, root). It never touches the core's
// config or API secret: every action goes through the narrow root helper netctl.py:
//  • left column  — the internet exit: group "ai-out" (Авто / Амнезия / each VLESS node)
//  • right column — client networks: groups "<client>-sw" switched between REJECT and
//    the client's WireGuard tunnel.
// Switching a group never reloads the core, so open connections (this chat) survive.

struct NetExit: Identifiable, Equatable {
    var id: String          // proxy name in the core
    var title: String
    var subtitle: String
    var delay: Int?         // ms, nil = unknown, 0 = dead
}

struct NetClient: Identifiable, Equatable {
    var id: String          // "saga"
    var title: String
    var subnet: String
    var on: Bool
    var delay: Int?
}

@MainActor
final class NetCore: ObservableObject {
    static let shared = NetCore()

    @Published var running = false
    @Published var exits: [NetExit] = []
    @Published var currentExit = ""
    @Published var autoPick = ""          // what "auto" chose
    @Published var clients: [NetClient] = []
    @Published var busy = false
    /// TUN on = the core carries the Mac's traffic; off = idle (e.g. back on AmneziaVPN).
    @Published var tunOn = false
    @Published var lastError: String?
    /// Amnezia connections (provider "amnezia-keys"), the group's choice and auto's pick.
    @Published var amneziaConns: [NetExit] = []
    @Published var amneziaNow = ""
    @Published var amneziaAutoPick = ""

    /// Delays measured by the group test (covers the subscription nodes too).
    private var measured: [String: Int] = [:]

    static let clientInfo: [String: (title: String, subnet: String)] = [
        "saga": ("Сага", "192.168.8.0/24"),
        "planet9": ("Planet9", "192.168.68.0/24"),
    ]

    // MARK: Root helper (netctl.py)
    //
    // The core, its config, keys and API secret are root-only. BroV only talks to the
    // narrow helper over /var/run/brov-netctl.sock (owner: this user, 0600): state, select,
    // delay, tun, add_key, remove_key — nothing that could rewrite the core config.

    private nonisolated static let socketPath = "/var/run/brov-netctl.sock"

    private func call(_ req: [String: Any], timeout: Int = 12) async -> [String: Any]? {
        guard let body = try? JSONSerialization.data(withJSONObject: req) else { return nil }
        // Raw bytes cross threads (Sendable); JSON is parsed back here.
        let reply: Data? = await withCheckedContinuation { cont in
            DispatchQueue.global(qos: .userInitiated).async {
                cont.resume(returning: Self.callSync(body, timeout: timeout))
            }
        }
        guard let reply else { return nil }
        return try? JSONSerialization.jsonObject(with: reply) as? [String: Any]
    }

    private nonisolated static func callSync(_ body: Data, timeout: Int) -> Data? {
        let fd = socket(AF_UNIX, SOCK_STREAM, 0)
        guard fd >= 0 else { return nil }
        defer { close(fd) }
        var tv = timeval(tv_sec: timeout, tv_usec: 0)
        setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, socklen_t(MemoryLayout<timeval>.size))
        setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, socklen_t(MemoryLayout<timeval>.size))
        var addr = sockaddr_un()
        addr.sun_family = sa_family_t(AF_UNIX)
        withUnsafeMutablePointer(to: &addr.sun_path) {
            $0.withMemoryRebound(to: CChar.self, capacity: 104) { _ = strncpy($0, socketPath, 103) }
        }
        let connected = withUnsafePointer(to: &addr) {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
                connect(fd, $0, socklen_t(MemoryLayout<sockaddr_un>.size))
            }
        }
        guard connected == 0 else { return nil }
        var data = body
        data.append(0x0A)
        let sent = data.withUnsafeBytes { send(fd, $0.baseAddress, data.count, 0) }
        guard sent == data.count else { return nil }
        var out = Data()
        var buf = [UInt8](repeating: 0, count: 65536)
        while !out.contains(0x0A) {
            let n = recv(fd, &buf, buf.count, 0)
            if n <= 0 { break }
            out.append(contentsOf: buf[0..<n])
        }
        guard let line = out.split(separator: 0x0A).first else { return nil }
        return Data(line)
    }

    /// Reads groups and last known delays.
    func refresh() async {
        guard let st = await call(["cmd": "state"]), st["ok"] as? Bool == true,
              let proxies = st["proxies"] as? [String: [String: Any]] else {
            running = false
            return
        }
        running = true
        tunOn = st["tun"] as? Bool ?? false
        // Provider proxies (VLESS nodes, Amnezia connections) keep their history in the
        // provider, not in /proxies.
        var providerDelay: [String: Int] = [:]
        var awgNames: [String] = []
        let providers = st["providers"] as? [String: [[String: Any]]] ?? [:]
        for (prov, list) in providers {
            for x in list {
                guard let n = x["name"] as? String else { continue }
                if prov == "amnezia-keys" { awgNames.append(n) }
                if let h = x["history"] as? [[String: Any]], let d = h.last?["delay"] as? Int { providerDelay[n] = d }
            }
        }
        awgNames.sort()
        func lastDelay(_ name: String) -> Int? {
            if let d = measured[name] { return d }
            if let h = proxies[name]?["history"] as? [[String: Any]], let d = h.last?["delay"] as? Int { return d }
            return providerDelay[name]
        }
        amneziaNow = proxies["amnezia"]?["now"] as? String ?? ""
        amneziaAutoPick = proxies["amnezia-auto"]?["now"] as? String ?? ""
        let amneziaEffective = amneziaNow == "amnezia-auto" ? amneziaAutoPick : amneziaNow
        amneziaConns = [NetExit(id: "amnezia-auto", title: "Авто",
                                subtitle: amneziaAutoPick.isEmpty ? "быстрейшее подключение"
                                    : "сейчас: \(Self.pretty(amneziaAutoPick).0)",
                                delay: lastDelay(amneziaAutoPick))]
            + awgNames.map { NetExit(id: $0, title: Self.pretty($0).0, subtitle: "AmneziaWG", delay: lastDelay($0)) }
        if let g = proxies["ai-out"], let members = g["all"] as? [String] {
            currentExit = g["now"] as? String ?? ""
            autoPick = proxies["auto"]?["now"] as? String ?? ""
            exits = members.map { name in
                let (t, sub) = Self.pretty(name)
                let delay: Int? = name == "auto" ? lastDelay(autoPick)
                    : (name == "amnezia" ? lastDelay(amneziaEffective) : lastDelay(name))
                return NetExit(id: name, title: t, subtitle: name == "auto" && !autoPick.isEmpty
                               ? "сейчас: \(Self.pretty(autoPick).0)"
                               : (name == "amnezia" && !amneziaEffective.isEmpty
                                  ? "\(awgNames.count) подкл. · сейчас \(Self.pretty(amneziaEffective).0)" : sub),
                               delay: delay)
            }
        }
        clients = Self.clientInfo.keys.sorted().compactMap { id in
            guard let g = proxies["\(id)-sw"] else { return nil }
            let info = Self.clientInfo[id]!
            return NetClient(id: id, title: info.title, subnet: info.subnet,
                             on: (g["now"] as? String) == id, delay: lastDelay(id))
        }
    }

    /// Measures every exit and client tunnel (in parallel, inside the core).
    func measure() async {
        busy = true
        if let m = (await call(["cmd": "delay", "group": "ai-out"], timeout: 15))?["delays"] as? [String: Int] {
            measured = m
            // Members that didn't answer are missing from the map: mark them dead.
            for e in exits where e.id != "auto" && m[e.id] == nil { measured[e.id] = 0 }
        }
        if let m = (await call(["cmd": "delay", "group": "amnezia"], timeout: 15))?["delays"] as? [String: Int] {
            for (k, v) in m { measured[k] = v }
            for c in amneziaConns where c.id != "amnezia-auto" && m[c.id] == nil { measured[c.id] = 0 }
        }
        for c in clients where c.on {
            if let m = (await call(["cmd": "delay", "proxy": c.id], timeout: 15))?["delays"] as? [String: Int] {
                for (k, v) in m { measured[k] = v }
            }
        }
        await refresh()
        busy = false
    }

    func select(exit name: String) async {
        currentExit = name
        _ = await call(["cmd": "select", "group": "ai-out", "name": name])
        SoundEngine.shared.play("blip")
        await refresh()
    }

    func set(client id: String, on: Bool) async {
        if let i = clients.firstIndex(where: { $0.id == id }) { clients[i].on = on }
        _ = await call(["cmd": "select", "group": "\(id)-sw", "name": on ? id : "REJECT"])
        SoundEngine.shared.play(on ? "pop" : "close")
        if on, let m = (await call(["cmd": "delay", "proxy": id], timeout: 15))?["delays"] as? [String: Int] {
            for (k, v) in m { measured[k] = v }
        }
        await refresh()
    }

    func select(amnezia name: String) async {
        amneziaNow = name
        _ = await call(["cmd": "select", "group": "amnezia", "name": name])
        if currentExit != "amnezia" { _ = await call(["cmd": "select", "group": "ai-out", "name": "amnezia"]) }
        SoundEngine.shared.play("blip")
        await refresh()
    }

    /// Sends a pasted vpn:// key to the helper (it checks, stores and tests it as root).
    func addAmneziaKey(_ text: String) async -> (ok: Bool, message: String) {
        let key = text.trimmingCharacters(in: .whitespacesAndNewlines)
        guard key.hasPrefix("vpn://") else { return (false, "Ключ должен начинаться с vpn://") }
        guard let r = await call(["cmd": "add_key", "text": key], timeout: 30) else {
            return (false, "Помощник сетевого ядра не отвечает.")
        }
        guard r["ok"] as? Bool == true else {
            return (false, "Ключ не подходит: \(r["error"] as? String ?? "неизвестная ошибка")")
        }
        await refresh()
        let name = r["name"] as? String ?? "?"
        let server = r["server"] as? String ?? "?"
        if let d = r["delay"] as? Int, d > 0 {
            SoundEngine.shared.play("finish")
            return (true, "✓ «\(name)» подхватился · \(server) · \(d) мс")
        }
        return (true, "Ключ «\(name)» сохранён (\(server)), но сервер пока не отвечает. Он будет участвовать в выборе, когда оживёт.")
    }

    func removeAmnezia(_ proxyName: String) async {
        _ = await call(["cmd": "remove_key", "name": proxyName])
        SoundEngine.shared.play("close")
        await refresh()
    }

    static var amneziaRunning: Bool {
        // The app holds routes; its background AmneziaVPN-service doesn't.
        NSWorkspace.shared.runningApplications.contains { $0.localizedName == "AmneziaVPN" }
    }

    /// Turns traffic capture on/off without a password (the core keeps running).
    func setTun(_ on: Bool) async {
        if on && Self.amneziaRunning {
            lastError = "Сначала выключи AmneziaVPN — иначе она и ядро подерутся за маршрут."
            return
        }
        lastError = nil
        tunOn = on
        _ = await call(["cmd": "tun", "on": on])
        SoundEngine.shared.play(on ? "pop" : "close")
        try? await Task.sleep(for: .seconds(1))
        await refresh()
    }

    static func pretty(_ name: String) -> (String, String) {
        switch name {
        case "auto": return ("Авто", "самый быстрый выход")
        case "amnezia": return ("Амнезия", "AmneziaWG")
        case "amnezia-auto": return ("Авто", "быстрейшее подключение")
        case let n where n.hasPrefix("AWG "): return (String(n.dropFirst(4)), "AmneziaWG")
        case let n where n.contains("node3"): return ("node3", "VLESS · Нидерланды")
        case let n where n.contains("node2"): return ("node2", "VLESS · Париж")
        case "Stockholm": return ("Stockholm", "VLESS · Стокгольм")
        case "SkandiFlora": return ("SkandiFlora", "VLESS · Стокгольм")
        case "Helsinki": return ("Helsinki", "VLESS · Хельсинки")
        default: return (name, "VLESS")
        }
    }
}

// MARK: - Header button

struct NetGlobeButton: View {
    @ObservedObject private var net = NetCore.shared
    @State private var open = false

    var body: some View {
        Button { open.toggle() } label: {
            Image(systemName: "globe")
                .font(.system(size: 14))
                .foregroundColor(open ? Color(hex: "#F5F6F8") : Color(hex: "#8E939C"))
                .overlay(alignment: .topTrailing) {
                    Circle()
                        .fill(net.running ? Color(hex: "#34D399") : Color(hex: "#5F646D"))
                        .frame(width: 5, height: 5)
                        .offset(x: 2, y: -1)
                }
        }
        .buttonStyle(.plain)
        .help("Сети")
        .task { await net.refresh() }
        .popover(isPresented: $open, arrowEdge: .bottom) {
            NetPanel(net: net)
                .notchPopoverStyle()
        }
    }
}

// MARK: - Panel

struct NetPanel: View {
    @ObservedObject var net: NetCore

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            HStack(spacing: 6) {
                Image(systemName: "globe").font(.system(size: 13, weight: .semibold))
                Text("Сети").font(.system(size: 14, weight: .semibold))
                Circle().fill(net.running ? Color(hex: "#34D399") : Color(hex: "#F4505E")).frame(width: 6, height: 6)
                Text(net.running ? "ядро работает" : "ядро не запущено")
                    .font(.system(size: 11)).foregroundColor(Color(hex: "#8E939C"))
                Spacer()
                if net.running {
                    Button {
                        Task { await net.measure() }
                    } label: {
                        HStack(spacing: 4) {
                            if net.busy { ProgressView().controlSize(.mini) }
                            else { Image(systemName: "speedometer").font(.system(size: 11)) }
                            Text("Замерить").font(.system(size: 11, weight: .medium))
                        }
                        .padding(.horizontal, 8).frame(height: 22)
                        .background(Capsule().fill(Color.white.opacity(0.08)))
                    }
                    .buttonStyle(.plain)
                    .disabled(net.busy)
                }
            }

            if let err = net.lastError {
                Text(err).font(.system(size: 11.5)).foregroundColor(Color(hex: "#FB923C"))
                    .fixedSize(horizontal: false, vertical: true).frame(width: 444, alignment: .leading)
            }

            if !net.running {
                Text("Ядро не отвечает. Если служба ещё не установлена — выключи AmneziaVPN и один раз выполни в Терминале:\nsudo sh ~/Documents/work/macbookbrov/brov/scripts/netcore/install.sh\nДальше ядро будет запускаться само при включении Мака.")
                    .font(.system(size: 11.5))
                    .foregroundColor(Color(hex: "#B0B5BE"))
                    .textSelection(.enabled)
                    .fixedSize(horizontal: false, vertical: true)
                    .frame(width: 444, alignment: .leading)
            } else {
                NetRow(title: "Ядро перехватывает трафик",
                       subtitle: net.tunOn ? "весь трафик Мака идёт через BroV" : "выключено — Мак ходит сам (можно включить AmneziaVPN)",
                       delay: nil, isOn: net.tunOn, accent: "#A78BFA") {
                    Task { await net.setTun(!net.tunOn) }
                }
                .frame(width: 444)
                Rectangle().fill(Color.white.opacity(0.08)).frame(height: 1)
                HStack(alignment: .top, spacing: 14) {
                    VStack(alignment: .leading, spacing: 4) {
                        Text("ВЫХОД В ИНТЕРНЕТ").font(.system(size: 9.5, weight: .bold)).foregroundColor(Color(hex: "#6B7079"))
                        ForEach(net.exits) { e in
                            if e.id == "amnezia" {
                                AmneziaSection(net: net, exit: e)
                            } else {
                                NetRow(title: e.title, subtitle: e.subtitle, delay: e.delay,
                                       isOn: net.currentExit == e.id, accent: "#D97757") {
                                    guard net.currentExit != e.id else { return }
                                    Task { await net.select(exit: e.id) }
                                }
                            }
                        }
                    }
                    .frame(width: 230)

                    Rectangle().fill(Color.white.opacity(0.08)).frame(width: 1)

                    VStack(alignment: .leading, spacing: 4) {
                        Text("СЕТИ КЛИЕНТОВ").font(.system(size: 9.5, weight: .bold)).foregroundColor(Color(hex: "#6B7079"))
                        ForEach(net.clients) { c in
                            NetRow(title: c.title, subtitle: c.subnet, delay: c.on ? c.delay : nil,
                                   isOn: c.on, accent: "#34D399") {
                                Task { await net.set(client: c.id, on: !c.on) }
                            }
                        }
                        Text("Выключенная сеть недоступна. Claude и интернет это не трогает.")
                            .font(.system(size: 10.5)).foregroundColor(Color(hex: "#6B7079"))
                            .fixedSize(horizontal: false, vertical: true)
                            .padding(.top, 4)
                    }
                    .frame(width: 200)
                }
            }
        }
        .padding(14)
        .task {
            await net.refresh()
            if net.running { await net.measure() }
        }
    }
}

struct NetRow: View {
    let title: String
    let subtitle: String
    let delay: Int?
    let isOn: Bool
    let accent: String
    let action: () -> Void
    @State private var hovered = false

    private var delayText: String {
        guard let d = delay else { return "" }
        return d == 0 ? "нет ответа" : "\(d) мс"
    }
    private var delayColor: String {
        guard let d = delay else { return "#6B7079" }
        if d == 0 { return "#F4505E" }
        return d < 120 ? "#34D399" : (d < 300 ? "#F5A524" : "#F4505E")
    }

    var body: some View {
        Button(action: action) {
            HStack(spacing: 8) {
                VStack(alignment: .leading, spacing: 1) {
                    Text(title).font(.system(size: 12.5, weight: .semibold))
                    Text(subtitle).font(.system(size: 10.5)).foregroundColor(Color(hex: "#8E939C")).lineLimit(1)
                }
                Spacer(minLength: 4)
                Text(delayText).font(.system(size: 10.5, weight: .medium)).monospacedDigit()
                    .foregroundColor(Color(hex: delayColor))
                // Switch look-alike
                ZStack(alignment: isOn ? .trailing : .leading) {
                    Capsule().fill(isOn ? Color(hex: accent) : Color.white.opacity(0.14))
                        .frame(width: 30, height: 18)
                    Circle().fill(Color.white).frame(width: 14, height: 14).padding(2)
                }
                .animation(.spring(response: 0.25, dampingFraction: 0.8), value: isOn)
            }
            .padding(.horizontal, 8).padding(.vertical, 5)
            .background(RoundedRectangle(cornerRadius: 8).fill(Color.white.opacity(hovered ? 0.06 : 0)))
            .contentShape(Rectangle())
        }
        .buttonStyle(.plain)
        .onHover { hovered = $0 }
    }
}

// MARK: - Amnezia: several connections

/// "Амнезия" row: the switch picks Amnezia as the exit, the name opens the list of
/// connections (Авто / each key) with "+ Добавить подключение" at the end.
struct AmneziaSection: View {
    @ObservedObject var net: NetCore
    let exit: NetExit
    @State private var expanded = false
    @State private var adding = false
    @State private var confirmRemove: String?

    var body: some View {
        VStack(alignment: .leading, spacing: 2) {
            HStack(spacing: 8) {
                Button { withAnimation(.easeOut(duration: 0.15)) { expanded.toggle() } } label: {
                    HStack(spacing: 6) {
                        VStack(alignment: .leading, spacing: 1) {
                            HStack(spacing: 4) {
                                Text(exit.title).font(.system(size: 12.5, weight: .semibold))
                                Image(systemName: expanded ? "chevron.up" : "chevron.down")
                                    .font(.system(size: 8.5, weight: .bold)).foregroundColor(Color(hex: "#8E939C"))
                            }
                            Text(exit.subtitle).font(.system(size: 10.5)).foregroundColor(Color(hex: "#8E939C")).lineLimit(1)
                        }
                        Spacer(minLength: 4)
                    }
                    .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
                NetRow(title: "", subtitle: "", delay: exit.delay, isOn: net.currentExit == "amnezia", accent: "#D97757") {
                    guard net.currentExit != "amnezia" else { return }
                    Task { await net.select(exit: "amnezia") }
                }
                .frame(width: 110)
            }
            .padding(.leading, 8)

            if expanded {
                VStack(alignment: .leading, spacing: 1) {
                    ForEach(net.amneziaConns) { c in
                        NetRow(title: c.title, subtitle: c.subtitle, delay: c.delay,
                               isOn: net.currentExit == "amnezia" && net.amneziaNow == c.id, accent: "#D97757") {
                            Task { await net.select(amnezia: c.id) }
                        }
                        .contextMenu {
                            if c.id != "amnezia-auto" {
                                Button("Удалить подключение…", role: .destructive) { confirmRemove = c.id }
                            }
                        }
                    }
                    Button { adding = true } label: {
                        HStack(spacing: 6) {
                            Image(systemName: "plus.circle.fill").font(.system(size: 12))
                            Text("Добавить подключение").font(.system(size: 12, weight: .medium))
                        }
                        .foregroundColor(Color(hex: "#D97757"))
                        .padding(.horizontal, 8).padding(.vertical, 6)
                        .contentShape(Rectangle())
                    }
                    .buttonStyle(.plain)
                    .popover(isPresented: $adding, arrowEdge: .trailing) {
                        AddAmneziaKeyView(net: net) { adding = false }
                            .notchPopoverStyle()
                    }
                }
                .padding(.leading, 12)
                .overlay(alignment: .leading) {
                    Rectangle().fill(Color.white.opacity(0.08)).frame(width: 1).padding(.leading, 6)
                }
            }
        }
        .confirmationDialog("Удалить подключение «\(NetCore.pretty(confirmRemove ?? "").0)»?",
                            isPresented: Binding(get: { confirmRemove != nil }, set: { if !$0 { confirmRemove = nil } })) {
            Button("Удалить", role: .destructive) {
                if let n = confirmRemove { Task { await net.removeAmnezia(n) } }
                confirmRemove = nil
            }
            Button("Отмена", role: .cancel) { confirmRemove = nil }
        } message: {
            Text("Ключ будет удалён с этого Мака. Вернуть можно, вставив его снова.")
        }
    }
}

/// Paste a vpn:// key → BroV checks it, stores it and tells whether it connected.
struct AddAmneziaKeyView: View {
    @ObservedObject var net: NetCore
    let onDone: () -> Void
    @State private var text = ""
    @State private var working = false
    @State private var result: (ok: Bool, message: String)?

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            Text("Новое подключение Амнезии").font(.system(size: 13, weight: .semibold))
            Text("Вставь ключ vpn:// из приложения Amnezia (Поделиться → AmneziaWG или ключ целиком).")
                .font(.system(size: 11)).foregroundColor(Color(hex: "#8E939C"))
                .fixedSize(horizontal: false, vertical: true)
            TextEditor(text: $text)
                .font(.system(size: 10.5, design: .monospaced))
                .scrollContentBackground(.hidden)
                .padding(6)
                .frame(height: 90)
                .background(RoundedRectangle(cornerRadius: 8).fill(Color.white.opacity(0.06)))
            if let r = result {
                Text(r.message)
                    .font(.system(size: 11.5, weight: .medium))
                    .foregroundColor(Color(hex: r.ok ? "#34D399" : "#FB923C"))
                    .fixedSize(horizontal: false, vertical: true)
            }
            HStack {
                Spacer()
                Button(result?.ok == true ? "Готово" : "Отмена") { onDone() }
                Button {
                    working = true
                    Task {
                        result = await net.addAmneziaKey(text)
                        if result?.ok == true { text = "" }
                        working = false
                    }
                } label: {
                    HStack(spacing: 5) {
                        if working { ProgressView().controlSize(.small) }
                        Text("Проверить и добавить")
                    }
                }
                .keyboardShortcut(.defaultAction)
                .disabled(working || text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
            }
        }
        .padding(14)
        .frame(width: 340)
    }
}