#!/usr/bin/env sh
# bootstrap.sh - Build c-md by traversing major version tags
#
# This script builds c-md from scratch by going through each major version
# tag in order. Each version is built using the binary from the previous
# version, starting from v1.0.0 which uses plain C sources.
#
# Use this script after a fresh clone or after 'make fclean'.

set -e

TMP_BIN="/tmp/c-md-bootstrap-$$"
CURRENT=""
STASH_NEEDED=0

cleanup() {
    # Restore original branch if we switched
    if [ -n "$CURRENT" ]; then
        CURRENT_BRANCH=$(git branch --show-current)
        if [ "$CURRENT_BRANCH" != "$CURRENT" ]; then
            echo "Restoring original branch..."
            git switch "$CURRENT" --quiet 2>/dev/null || git checkout "$CURRENT" --quiet 2>/dev/null || true
        fi
    fi

    # Restore stashed changes
    if [ "$STASH_NEEDED" -eq 1 ]; then
        echo "Restoring stashed changes..."
        git stash pop --quiet 2>/dev/null || echo "Warning: Could not restore stashed changes"
    fi

    rm -f "$TMP_BIN"
}

trap cleanup EXIT INT TERM

get_highest_major_tags() {
  git tag -l 'v*' \
      | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' \
      | sort -V \
      | awk -F. '
    {
        m=substr($1, 2)+0;
        tag = $0
        tags[m] = tag  # Overwrite; since input is sorted, last wins (highest)
    } END {
        for (m in tags) print tags[m]
    }' \
    | sort -V
}

echo "Bootstrapping c-md..."

CURRENT=$(git branch --show-current)
if [ -n "$(git status --porcelain)" ]; then
    echo "Stashing local changes..."
    git stash --include-untracked --quiet
    STASH_NEEDED=1
fi

TAGS=$(get_highest_major_tags)

if [ -z "$TAGS" ]; then
    echo "No version tags found. Building current version from C sources..."
    make --quiet
    echo "Bootstrap complete. Binary ready at ./c-md"
    exit 0
fi

echo "Found major versions: $(echo $TAGS | tr '\n' ' ')"

for TAG in $TAGS; do
    echo "Building $TAG..."
    git switch --detach "$TAG" --quiet

    if [ -f "$TMP_BIN" ]; then
        cp "$TMP_BIN" ./c-md
    fi

    make --quiet
    cp c-md "$TMP_BIN"
    make fclean --quiet
done

echo "Restoring current branch..."
git switch "$CURRENT" --quiet

if [ "$STASH_NEEDED" -eq 1 ]; then
    echo "Restoring stashed changes..."
    git stash pop --quiet
    STASH_NEEDED=0
fi

echo "Building current version..."
cp "$TMP_BIN" ./c-md
make --quiet
cp c-md "$TMP_BIN"
make fclean --quiet
mv "$TMP_BIN" ./c-md

echo ""
echo "Bootstrap complete. Binary ready at ./c-md"
echo "Run 'make' to rebuild from sources."