#!/usr/bin/env nix-shell
#! nix-shell -i bash ../shell.nix

# Get the target branch (the branch being merged into)
target_branch=""

# Check if we're in the middle of a merge
if [ -f .git/MERGE_HEAD ]; then
    # We're in a merge, check if the current branch is main
    current_branch=$(git branch --show-current)
    if [ "$current_branch" = "main" ]; then
        target_branch="main"
    fi
fi

# If we're merging into main, run nix flake check
if [ "$target_branch" = "main" ]; then
    echo "Merging into main branch - running nix flake check..."
    
    echo "stashing all uncommitted changes with named stash (excluding hooks)"
    git stash push -q --keep-index -m "pre-merge-stash-$(date +%s)" -- ':!.hooks/'

    echo "checking flakes all compile"
    nix flake check

    if [ ! $? -eq 0 ]; then
        echo "Error: nix flake check failed. Merge aborted."
        echo "Please fix the issues and try merging again."
        exit 1
    fi
    
    echo "nix flake check passed. Merge can proceed."
else
    echo "Not merging into main branch, skipping nix flake check."
fi

exit 0