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

let theme = (import ./colors.nix)."dark";
	hex   = (c: "#${c}");

	# Keybinds that launch an application.
	launchers = ({ browser }: mod: {
		"${mod}+Tab" = "exec ${browser}";
	});

	# Keybinds generated from a set of workspaces.
	workspace = ({ numbered ? 0, named ? {} }: mod: with lib;
		let nums 	   = genAttrs (map toString (range 1 numbered)) id;
			workspaces = named // nums;
			genBinds   = (n: k: {
    			
    			# Focus the workspace
    			"${mod}+${k}" 		= "workspace ${n}";

    			# Move a window to the workspace
    			"${mod}+Shift+${k}" = "move window to workspace ${n}";

			});
			keybinds	= mapAttrsToList genBinds workspaces; in
		mkMerge (keybinds)
    );

	# Layout manipulation keybinds.
	layout = (mod: {

		"${mod}+A" = "split v";
		"${mod}+S" = "split h";

		"${mod}+F" = "fullscreen toggle";

	});

	# Directional keys are used for basic navigation.
	directional = ({ left, right, up, down }: mod: {

		# Change window focus
    	"${mod}+${left}" 	= "focus left";
    	"${mod}+${down}" 	= "focus down";
    	"${mod}+${up}"		= "focus up";
    	"${mod}+${right}"	= "focus right";

		# Move windows
		"${mod}+Shift+${left}"  = "move left";
		"${mod}+Shift+${down}" 	= "move down";
		"${mod}+Shift+${up}" 	= "move up";
		"${mod}+Shift+${right}" = "move right";

	});

	# Media controls.
	media = ({ mpc ? null }: mod:
		if (mpc != null)
			then (let cmd = "${mpc}/bin/${mpc.pname}"; in {
    			"${mod}+comma"  = "exec ${cmd} prev";
    			"${mod}+period" = "exec ${cmd} next";
    			"${mod}+slash"	= "exec ${cmd} toggle";
    		})
        	else {}
    );

	# Utility scripts and such.
	scripts = (mod: {}); in

{
    
	services.xserver = {
		enable = true;
		windowManager.i3 = {
    		enable = true;
    		package = pkgs.i3; #-gaps;
		};
	};

	home-manager.users."riley" =
		let browser = pkgs.google-chrome;
            term 	= pkgs.alacritty; in
		{

    	home.packages = with pkgs; [

        	tdesktop
        	
        	xclip

        	# Paste from clipboard
        	(writeShellApplication {
				name = "xc.p";
				runtimeInputs = [ xclip ];
				text = "xclip -sel clip -o";
        	})

        	# Copy to clipboard
        	(writeShellApplication {
				name = "xc.c";
				runtimeInputs = [ xclip ];
				text = "xclip -sel clip -i";
        	})

        	# Copy to clipboard with given mime type
        	(writeShellApplication {
				name = "xc.t";
				runtimeInputs = [ xclip ];
				text = "xclip -sel clip -t \"$1\" -i";
        	})

    	] ++ [
        	term
        	browser
    	];

        xsession.windowManager.i3 = {
            enable = true;

            package = pkgs.i3;

            config = with lib; (rec {

                modifier = "Mod4";
                terminal = "${term}/bin/${term.pname}";

				# Apply the modifier key to each of the keybinding generator functions
				# and merge the resulting sets.
                keybindings = let mod = modifier; in mkMerge (map (f: f (mod)) [
                    (mod: {
    					"${mod}+Return" 	= "exec ${terminal}";
    					"${mod}+BackSpace" 	= "kill";
                    })
                	(directional {
                        left  = "H";
                        right = "L";
						down  = "J";
						up 	  = "K";
                    })
                    (workspace {
                        numbered = 5;
                        named = {
							"dev" = "0";
							"doc" = "minus";
							"net" = "equal";
                        };
                    })
                    (launchers {
						browser = "google-chrome-stable";
                    })
                    layout
                    (media {
                   		mpc = pkgs.mpc_cli;
					})
                    scripts
                ]);

                colors = {
					focused = rec {
						background 	= hex (theme.background.normal);
						text		= hex (theme."red".bright);
						border 		= background;
						childBorder = border;
						indicator   = border;
					};
					unfocused = rec {
						background 	= hex (theme.background.normal);
						text 		= hex (theme.foreground.slight);
						border 		= background;
						childBorder = border;
						indicator   = border;
					};
					focusedInactive = colors.unfocused;
                };

                window = {
                    border = 2;
                    commands = [
						{ command = "border pixel 2"; criteria = { class = ".*"; }; }
                    ];
                };

                fonts = {
					names = [ "Source Sans 3" ];
					style = "Semibold";
					size = 10.0;
                };

            });

        };

	};
	
}