import SwiftUI
import GhosttyTerminal
import GhosttyTheme

/// 统一主题：一套配色同时驱动 **app UI**（下面的颜色角色）和 **终端**（`ghosttyName` → GhosttyTheme）。
/// 在设置里选主题后 app 与终端一起变色。新增主题 = 再写一个 `static let`，视图零改动。
struct TXPalette: Equatable, Identifiable {
    let id: String
    let name: String
    let isDark: Bool
    /// 对应 GhosttyTheme 目录名，驱动终端配色（与 app 配色取自同一 Catppuccin flavor，视觉统一）。
    let ghosttyName: String

    let bg: Color
    let surface: Color
    let surfaceElevated: Color
    let accent: Color
    let accentSoft: Color
    let textPrimary: Color
    let textSecondary: Color
    let textTertiary: Color
    let border: Color
    let borderStrong: Color
    let running: Color
    let mosh: Color
    let warning: Color
    let offline: Color

    /// 该主题的终端配色（GhosttyTheme → TerminalTheme）。找不到回退系统默认。
    var terminalTheme: TerminalTheme {
        GhosttyThemeCatalog.theme(named: ghosttyName)?.toTerminalTheme() ?? .default
    }
}

extension TXPalette {
    /// 用一套 Catppuccin flavor 的核心色构造统一 palette（app 与终端同源）。
    private static func catppuccin(
        id: String, name: String, ghostty: String, isDark: Bool,
        base: UInt32, surface0: UInt32, surface1: UInt32,
        text: UInt32, subtext0: UInt32, overlay0: UInt32,
        green: UInt32, teal: UInt32, yellow: UInt32
    ) -> TXPalette {
        TXPalette(
            id: id, name: name, isDark: isDark, ghosttyName: ghostty,
            bg: Color(hex: base),
            surface: Color(hex: surface0),
            surfaceElevated: Color(hex: surface1),
            accent: Color(hex: green),
            accentSoft: Color(hex: green).opacity(0.16),
            textPrimary: Color(hex: text),
            textSecondary: Color(hex: subtext0),
            textTertiary: Color(hex: overlay0),
            border: (isDark ? Color.white : Color.black).opacity(0.08),
            borderStrong: (isDark ? Color.white : Color.black).opacity(0.14),
            running: Color(hex: green),
            mosh: Color(hex: teal),
            warning: Color(hex: yellow),
            offline: Color(hex: overlay0)
        )
    }

    static let catppuccinMocha = catppuccin(
        id: "catppuccin-mocha", name: "Catppuccin Mocha", ghostty: "Catppuccin Mocha", isDark: true,
        base: 0x1E1E2E, surface0: 0x313244, surface1: 0x45475A,
        text: 0xCDD6F4, subtext0: 0xA6ADC8, overlay0: 0x6C7086,
        green: 0xA6E3A1, teal: 0x94E2D5, yellow: 0xF9E2AF)

    static let catppuccinMacchiato = catppuccin(
        id: "catppuccin-macchiato", name: "Catppuccin Macchiato", ghostty: "Catppuccin Macchiato", isDark: true,
        base: 0x24273A, surface0: 0x363A4F, surface1: 0x494D64,
        text: 0xCAD3F5, subtext0: 0xA5ADCB, overlay0: 0x6E738D,
        green: 0xA6DA95, teal: 0x8BD5CA, yellow: 0xEED49F)

    static let catppuccinFrappe = catppuccin(
        id: "catppuccin-frappe", name: "Catppuccin Frappé", ghostty: "Catppuccin Frappe", isDark: true,
        base: 0x303446, surface0: 0x414559, surface1: 0x51576D,
        text: 0xC6D0F5, subtext0: 0xA5ADCE, overlay0: 0x737994,
        green: 0xA6D189, teal: 0x81C8BE, yellow: 0xE5C890)

    static let catppuccinLatte = catppuccin(
        id: "catppuccin-latte", name: "Catppuccin Latte", ghostty: "Catppuccin Latte", isDark: false,
        base: 0xEFF1F5, surface0: 0xCCD0DA, surface1: 0xBCC0CC,
        text: 0x4C4F69, subtext0: 0x6C6F85, overlay0: 0x9CA0B0,
        green: 0x40A02B, teal: 0x179299, yellow: 0xDF8E1D)

    /// 可选主题（设置里列出）。默认第一个。
    static let all: [TXPalette] = [catppuccinMocha, catppuccinMacchiato, catppuccinFrappe, catppuccinLatte]
    static let `default` = catppuccinMocha

    static func byID(_ id: String?) -> TXPalette {
        all.first { $0.id == id } ?? .default
    }
}

/// 当前主题的持有者（app + 终端统一）。选择持久化到 UserDefaults，终端侧经 `TerminalTheme.txDefault` 同源读取。
/// 主题选择的持久化键（文件级 nonisolated，供 app 与终端两侧读取）。
let txThemeStorageKey = "txThemeID"

@MainActor
final class TXThemeManager: ObservableObject {
    @Published var palette: TXPalette

    init() {
        palette = TXPalette.byID(UserDefaults.standard.string(forKey: txThemeStorageKey))
    }

    /// 切换主题：持久化 + 更新（app 视图响应式；终端由 ContentView 观察 palette.id 变化后推送）。
    func apply(_ palette: TXPalette) {
        self.palette = palette
        UserDefaults.standard.set(palette.id, forKey: txThemeStorageKey)
    }
}

extension TerminalTheme {
    /// 当前所选主题的终端配色（与 app 同源）。model / tmux pane 新建时读取，保证新面板也用当前主题。
    static var txDefault: TerminalTheme {
        TXPalette.byID(UserDefaults.standard.string(forKey: txThemeStorageKey)).terminalTheme
    }
}

/// 结构性设计令牌（圆角/间距/字体）——不随主题变。
enum TX {
    enum Radius {
        static let card: CGFloat = 16
        static let chip: CGFloat = 10
        static let field: CGFloat = 12
    }
    enum Space {
        static let xs: CGFloat = 6
        static let s: CGFloat = 10
        static let m: CGFloat = 16
        static let l: CGFloat = 22
        static let xl: CGFloat = 32
    }
    enum Font {
        static func mono(_ size: CGFloat, _ weight: SwiftUI.Font.Weight = .regular) -> SwiftUI.Font {
            .system(size: size, weight: weight, design: .monospaced)
        }
    }
}

extension Color {
    /// 0xRRGGBB 十六进制构造。
    init(hex: UInt32) {
        self.init(
            .sRGB,
            red: Double((hex >> 16) & 0xFF) / 255,
            green: Double((hex >> 8) & 0xFF) / 255,
            blue: Double(hex & 0xFF) / 255,
            opacity: 1
        )
    }
}