#!/bin/env fish
set -l dir (status dirname)
set -l cmdline (cat /proc/$fish_pid/cmdline | string split0)
source "$dir/../Scripts/settings.fish"
source "$dir/../Scripts/hooks.fish"

if [ (id -u) -eq 0 ]
    set -l nixVersion nixos-24.05
    set -l sudoConfig "/etc/sudoers.d/PortValhalla"
    set -l channelDir /nix/var/nix/profiles/per-user/root/channels/nixpkgs
    rm ~/.bash_profile

    if ! git status -C (status dirname) &> /dev/null
        git config --system --add safe.directory (realpath "$(status dirname)/../../..")
    end

    if [ -z "$TMUX" ]
        if [ -z "$CONFIG_NAME" ]
            selectProfile config
            and set -x CONFIG_NAME "$config"
        end

        if [ ! -d "$channelDir" ]
            mkdir -p "$channelDir"
            and git clone https://github.com/NixOS/nixpkgs.git --depth=1 -b "$nixVersion" "$channelDir"
            and rm -rf "$channelDir/.git"
        end

        and runHook --force installValhallaDeps 'Please set up a function `installValhallaDeps` for installing `fish`, `git`, `jq`, `nix`, `sudo` and `tmux`.'
        and tmux new-session $cmdline
    else
        set -l name (getOSConfig setupUser.name)

        begin
            echo "Creating setup user"

            and useradd \
                --comment "PortValhalla Setup User" \
                --system \
                --no-user-group \
                --groups nix-users \
                --create-home \
                --uid (getOSConfig setupUser.id --json) \
                "$name"
        end

        and begin
            echo "$name ALL=(ALL:ALL) NOPASSWD: ALL"
        end >"$sudoConfig"

        and sudo --preserve-env --set-home --user "$name" $cmdline
        rm "$sudoConfig"
        userdel -rf "$name"
        rm -rf "$channelDir"
    end
else
    if not type -q getDeploymentScript
        function getDeploymentScript
            echo "No deployment script specified! No software will be installed." 1>&2
            false
        end
    end

    set -l deployScript (getDeploymentScript)
    runHook initialize || true
    and runHook installOS || true

    and runHook installSoftware || begin
        echo "Installing software..."

        and if [ -n "$deployScript" ]
            source $deployScript
        end
    end

    and runHook addUsers || begin
        source "$dir/users.fish"
    end

    runHook initializeUsers || begin
        if [ -n "$deployScript" ]
            source "$dir/../Scripts/settings.fish"

            for name in (getUsers | jq '.[]' --raw-output0 | string split0)
                echo "Configuring user `$name`..."
                and source $deployScript userConfig $name
            end
        end
    end

    and runHook postInstall || true
    and sudo git config remove-section --system safe || true

    and begin
        echo "Cleaning installation scripts..."
        set -l projectPath (realpath "$(status dirname)/../../..")
        cd (dirname "$projectPath")
        sudo rm -rf "$projectPath"
    end

    and echo "The installation finished successfully!"
    and echo "This machine will reboot in 5 seconds..."
    and echo "Press CTRL-C to abort..."
    and sleep 5
    and systemctl reboot -i
end