#!/bin/sh

# Installation script to make the dotfiles available in ~/
#
# `git` is the only dependency for this script to run (See: https://git-scm.com)
#
# See: https://code.webartifex.biz/alexander/dotfiles#installation


set -e


XDG_DATA_HOME="$HOME/.local/share"  # also set in ~/.config/shell/env
DOTFILES_DIR="$XDG_DATA_HOME/dotfiles"  # also set in ~/.config/shell/env


# Check if the dotfiles were installed previously
if [ -d "$DOTFILES_DIR" ] && [ "${FORCE_INSTALL:-}" != "1" ]; then
    echo ""
    echo "The dotfiles are already installed at: $DOTFILES_DIR"
    echo ""
    echo "Options:"
    echo "  - Set 'export FORCE_INSTALL=1' and run installation again"
    echo "  - Update with 'dotfiles pull' and continue using them"
    echo ""
else
    # Remove an already installed dotfiles repository
    if [ -d "$DOTFILES_DIR" ]; then
        rm -rf "$DOTFILES_DIR"
    fi

    if [ -z "$DOTFILES_BRANCH" ]; then
        # Auto-detect if we're on a desktop system
        if [ -n "$DISPLAY" ] || [ -n "$WAYLAND_DISPLAY" ] || [ "$(systemctl --user is-active graphical-session.target 2>/dev/null)" = "active" ]; then
            export DOTFILES_BRANCH="desktop"
        else
            export DOTFILES_BRANCH="main"
        fi
    elif [ "$DOTFILES_BRANCH" != "desktop" ] && [ "$DOTFILES_BRANCH" != "main" ]; then
        echo ""
        echo "'DOTFILES_BRANCH' may only be one of: 'desktop' or 'main'"
        exit 1
    fi

    mkdir -p "$XDG_DATA_HOME"

    git clone --bare https://code.webartifex.biz/alexander/dotfiles "$XDG_DATA_HOME/dotfiles"

    # Do not checkout project documentation intended for web GUIs (e.g., GitHub)
    git --git-dir="$DOTFILES_DIR" --work-tree="$HOME" config core.sparseCheckout true
    echo "/*" > "$DOTFILES_DIR/info/sparse-checkout"
    echo "!LICENSE.txt" >> "$DOTFILES_DIR/info/sparse-checkout"
    echo "!README.md" >> "$DOTFILES_DIR/info/sparse-checkout"

    # Put the dotfiles in the user's `$HOME` folder
    git --git-dir="$DOTFILES_DIR" --work-tree="$HOME" checkout --force "$DOTFILES_BRANCH"

    # Do not show files not tracked in the dotfiles repository because there are simply too many
    git --git-dir="$DOTFILES_DIR" --work-tree="$HOME" config --local status.showUntrackedFiles no

    # The author of this file prefers to use SSH to sync his machines with the origin
    git --git-dir="$DOTFILES_DIR" --work-tree="$HOME" remote set-url origin git@git.webartifex.biz:alexander/dotfiles.git

    # Remove potentially conflicting `bash` startup files
    rm -f "$HOME/.bash_login"
    rm -f "$HOME/.bash_profile"

    echo ""
    echo "The dotfiles were installed successfully"

    # Mimic starting a new shell to get new dotfiles right away
    if [ -n "$ZSH_VERSION" ]; then
        . "$HOME/.zshrc"
    else
        . "$HOME/.profile"
    fi

fi