{ config, pkgs, lib, ... }:

{
  # === macOS-specific configuration ===

  home.packages = with pkgs; [
    # macOS window manager
    aerospace

    # Keyboard remapping (GUI app — download separately or install via brew)
    # brew install --cask karabiner-elements
  ];

  # =============================================================================
  # KEYBOARD GOAL: Consistent finger positions across keyboards
  #
  #   ThinkPad T490 (Linux):     Ctrl | Super(Win) | Alt | Space
  #   Keychron V10M (macOS):     Ctrl | Alt(⌥)     | Cmd  | Space  ← remapped
  #   After remap (macOS):       Ctrl | Super(Cmd)  | Alt | Space
  #
  #   Muscle memory:
  #     Middle key   → Super/Cmd   = WM actions (workspaces, focus, move)
  #     Next to space → Alt/Option = app shortcuts
  #
  # Remap: Physical Alt(⌥) → Cmd(⌘), Physical Cmd(⌘) → Alt(⌥)
  # Applied via Karabiner-Elements, targeted to Keychron only.
  #
  # To find your Keychron's vendor/product IDs:
  #   1. Open Karabiner-Elements → EventViewer tab
  #   2. Press a key on the Keychron
  #   3. Note the "VendorID" and "ProductID" values
  #   4. Update them in the JSON below
  #
  # =============================================================================

  home.file.".config/karabiner/karabiner.json" = {
    force = true;
    text = builtins.toJSON {
      global = {
        check_for_updates_on_startup = false;
        show_in_menu_bar = false;
        show_profile_name_in_menu_bar = false;
      };
      profiles = [
        {
          name = "Default";
          selected = true;
          simple_modifications = [];
          fn_function_keys = [];
          virtual_hid_keyboard = {
            keyboard_type = "ansi";
            caps_lock_delay_microseconds = 0;
          };
          devices = [];
          complex_modifications = {
            parameters = {
              "basic.simultaneous_threshold_milliseconds" = 50;
              "basic.to_if_held_down_threshold_milliseconds" = 500;
              "basic.to_delayed_action_delay_milliseconds" = 500;
              "basic.to_if_alone_timeout_milliseconds" = 1000;
            };
            rules = [
              {
                description = "Keychron V10M: swap Option ↔ Command (match ThinkPad bottom row)";
                manipulators = [
                  {
                    # Physical Alt(⌥) → sends Cmd(⌘) = Super/WM key
                    type = "basic";
                    from = {
                      key_code = "left_alt";
                      modifiers = { optional = [ "any" ]; };
                    };
                    to = [ { key_code = "left_gui"; } ];
                    conditions = [
                      {
                        type = "device_if";
                        identifiers = [
                          {
                            # ⚠ UPDATE THESE with your Keychron's IDs
                            vendor_id = 0;
                            product_id = 0;
                            description = "Keychron V10M (Alice 75)";
                          }
                        ];
                      }
                    ];
                  }
                  {
                    # Physical Cmd(⌘) → sends Alt(⌥) = Alt key
                    type = "basic";
                    from = {
                      key_code = "left_gui";
                      modifiers = { optional = [ "any" ]; };
                    };
                    to = [ { key_code = "left_alt"; } ];
                    conditions = [
                      {
                        type = "device_if";
                        identifiers = [
                          {
                            vendor_id = 0;
                            product_id = 0;
                          }
                        ];
                      }
                    ];
                  }
                ];
              }
            ];
          };
        }
      ];
    };
  };

  # =============================================================================
  # AEROSPACE — macOS Tiling Window Manager
  #
  # Keybindings use `cmd` (Super after remap) to match Hyprland's SUPER:
  #   Middle key + number   → switch workspace
  #   Middle key + h/j/k/l  → focus direction
  #   Middle key + tab      → focus next window (cycle through all workspaces)
  #   Middle key + shift    → move window
  #
  # macOS-native Cmd+Tab (now Alt+Tab after remap) still cycles apps.
  # =============================================================================

  home.file.".config/aerospace/aerospace.toml" = {
    force = true;
    text = ''
      # =============================================================================
      # Aerospace — macOS Tiling Window Manager
      #
      # Keybinding conventions (after Keychron remap matches ThinkPad):
      #   cmd (middle key)   = SUPER — WM actions
      #   alt (next to space) = ALT — app shortcuts
      # =============================================================================

      # --- General ---
      [general]
      border = true
      gaps = {
        inner = { px = 6, vertical = 8, horizontal = 8 },
        outer = { px = 4, px-monitor-workspace = 4, bottom = 6 },
      }

      # =============================================================================
      # WORKSPACE SWITCHING  —  cmd = middle key
      # =============================================================================
      [mode.main.binding]
      # Switch to workspace
      cmd-1 = "workspace 1"
      cmd-2 = "workspace 2"
      cmd-3 = "workspace 3"
      cmd-4 = "workspace 4"
      cmd-5 = "workspace 5"
      cmd-6 = "workspace 6"
      cmd-7 = "workspace 7"
      cmd-8 = "workspace 8"
      cmd-9 = "workspace 9"

      # Move window to workspace
      cmd-shift-1 = "move-node-to-workspace 1"
      cmd-shift-2 = "move-node-to-workspace 2"
      cmd-shift-3 = "move-node-to-workspace 3"
      cmd-shift-4 = "move-node-to-workspace 4"
      cmd-shift-5 = "move-node-to-workspace 5"
      cmd-shift-6 = "move-node-to-workspace 6"
      cmd-shift-7 = "move-node-to-workspace 7"
      cmd-shift-8 = "move-node-to-workspace 8"
      cmd-shift-9 = "move-node-to-workspace 9"

      # =============================================================================
      # FOCUS NAVIGATION  —  Vim-style with cmd (middle key)
      # =============================================================================
      cmd-h = "focus left"
      cmd-j = "focus down"
      cmd-k = "focus up"
      cmd-l = "focus right"

      # Tab through windows across all workspaces
      cmd-tab = "focus next"

      # =============================================================================
      # WINDOW MANAGEMENT
      # =============================================================================
      cmd-f = "fullscreen"
      cmd-w = "close"
      cmd-t = "floating toggle"
      cmd-d = "layout tiles horizontal vertical"
      cmd-shift-d = "layout tiles vertical horizontal"

      # =============================================================================
      # LAYOUT MANAGEMENT
      # =============================================================================
      cmd-r = "mode resize"

      cmd-shift-h = "move left"
      cmd-shift-j = "move down"
      cmd-shift-k = "move up"
      cmd-shift-l = "move right"

      # =============================================================================
      # RESIZE MODE
      # =============================================================================
      [mode.resize.binding]
      cmd-h = "resize -50 0"
      cmd-j = "resize 0 50"
      cmd-k = "resize 0 -50"
      cmd-l = "resize 50 0"
      escape = "mode main"
      enter = "mode main"

      # =============================================================================
      # MISC
      # =============================================================================
      cmd-shift-period = "reload-config"
      cmd-backslash = "layout v_accordion"
      cmd-shift-slash = "layout h_accordion"

      # =============================================================================
      # APP CYCLING
      #
      # macOS natively handles app cycling via Cmd+Tab.
      # After Karabiner remap, the physical key next to spacebar now sends Alt,
      # so what was Cmd+Tab is now available as a distinct chord.
      # We use cmd+tab (middle key + tab) for Aerospace's "focus next" above,
      # and the macOS native cycle is still accessible via alt+tab (next-to-space + tab).
      # =============================================================================
    '';
  };

  # =============================================================================
  # HELPER: Find Keychron keyboard IDs for Karabiner
  # =============================================================================
  home.file.".local/bin/find-keychron-id" = {
    force = true;
    executable = true;
    text = ''
      #!/usr/bin/env bash
      # Find your Keychron's vendor/product IDs for Karabiner-Elements config.
      #
      # Usage: ./find-keychron-id
      #
      # If Karabiner EventViewer is running, check its log for recent key events.
      LOG="$HOME/.local/share/karabiner/eventviewer.log"
      if [ -f "$LOG" ]; then
        echo "Checking Karabiner EventViewer log..."
        grep -i "keychron\|vendor_id\|product_id" "$LOG" 2>/dev/null | tail -10
      fi

      # Alternative: use ioreg to list HID devices
      echo ""
      echo "All HID keyboard devices (look for Keychron):"
      ioreg -p IOUSB -l -w 0 | grep -A 10 -i "keyboard\|keychron" 2>/dev/null || \\
        ioreg -r -c IOUSBDevice -l -w 0 | grep -A 15 -i "keychron\|keyboard" | grep -E "vendor|product|idProduct|idVendor|USB Product Name" | head -20

      echo ""
      echo "Or press a key on your Keychron and run:"
      echo "  hidutil list 2>/dev/null | grep -i keychron"
      echo ""
      echo "Then update vendor_id and product_id (as DECIMAL numbers) in:"
      echo "  ~/.config/karabiner/karabiner.json"
      echo ""
      echo "  e.g. if vendor_id=0x3434, product_id=0x0408"
      echo "  then in JSON: vendor_id=13364, product_id=1032"
    '';
  };
}