#!/bin/sh

# Replace the local `dotfiles` repository with a fresh install
# by downloading and re-running the latest `dotfiles-install`
#
# Refuses to run if there are uncommitted or unpushed changes,
# unless called with `--force`

set -eu


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


if [ -d "$DOTFILES_DIR" ]; then

    _git() {
        git --git-dir="$DOTFILES_DIR" --work-tree="$HOME" "$@"
    }

    # Keep the machine on its current branch (e.g., "desktop")
    branch=$(_git symbolic-ref --short HEAD) || {
        echo "" >&2
        echo "Detached HEAD => re-run after 'dotfiles checkout <branch>'" >&2
        echo "" >&2

        exit 1
    }

    [ "${1:-}" = "--force" ] && force=1 || force=0

    if [ "$force" -ne 1 ]; then

        if [ -n "$(_git status --porcelain)" ]; then
            echo "" >&2
            echo "There are uncommitted changes!" >&2
            echo "" >&2
            _git --no-pager diff HEAD --stat >&2
            echo "" >&2
            echo "=> Commit and push them, or re-run with --force" >&2
            echo "" >&2

            exit 1
        fi

        if _git rev-parse --verify --quiet "origin/$branch" >/dev/null \
            && [ -n "$(_git log --oneline "origin/$branch..$branch")" ]; then
            echo "" >&2
            echo "There are unpushed commits!" >&2
            echo "" >&2
            _git --no-pager log --oneline "origin/$branch..$branch" >&2
            echo "" >&2
            echo "=> Push them, or re-run with --force" >&2
            echo "" >&2

            exit 1
        fi

    fi

else
    branch="main"
fi


installer_url="https://code.webartifex.de/alexander/dotfiles/raw/branch/$branch/.local/bin/dotfiles-install"

installer_path=$(mktemp)
trap 'rm -f "$installer_path"' EXIT


if command -v curl >/dev/null 2>&1; then
    curl -fsSL "$installer_url" -o "$installer_path"
elif command -v wget >/dev/null 2>&1; then
    wget -q "$installer_url" -O "$installer_path"
else
    echo "" >&2
    echo "Neither curl nor wget are installed!" >&2
    echo "=> Install one of them" >&2
    echo "" >&2

    exit 1
fi


sh "$installer_path" --force