#!/usr/bin/env sh
set -eu

REPO_URL="${REPO_URL:-http://100.64.0.1:30087/section0/rta-handbook.git}"
TARGET_DIR="${TARGET_DIR:-$HOME/Developer/Section0/rta-handbook}"
COMMAND_DIR="${COMMAND_DIR:-$HOME/.local/bin}"
COMMAND_NAME="${COMMAND_NAME:-section0-docs}"
COMMAND_PATH="$COMMAND_DIR/$COMMAND_NAME"

step() {
  printf "\n==> %s\n" "$*"
}

if ! command -v git >/dev/null 2>&1; then
  echo "git is required but was not found on PATH" >&2
  exit 1
fi

step "Preparing local Markdown workspace"
if [ -d "$TARGET_DIR/.git" ]; then
  echo "Repo already exists: $TARGET_DIR"
  git -C "$TARGET_DIR" remote set-url origin "$REPO_URL"
  git -C "$TARGET_DIR" fetch origin
  git -C "$TARGET_DIR" checkout main
  git -C "$TARGET_DIR" pull --ff-only
else
  mkdir -p "$(dirname "$TARGET_DIR")"
  git clone "$REPO_URL" "$TARGET_DIR"
fi

git -C "$TARGET_DIR" config pull.ff only

step "Installing helper command"
mkdir -p "$COMMAND_DIR"
cat > "$COMMAND_PATH" <<EOF
#!/usr/bin/env sh
set -eu

REPO_DIR="$TARGET_DIR"

usage() {
  cat <<USAGE
section0-docs - helper for Section 0 Git Projection repos

Commands:
  configure set Git author name/email for this repo
  doctor    check clone, author, remote, and read access
  open      print the repo path
  pull      pull latest Markdown with --ff-only
  status    show Git status
  commit    commit all current changes with MESSAGE
  push      push current branch
  push-test prove write access with a temporary remote branch
  help      show this help

Examples:
  section0-docs doctor
  section0-docs configure
  section0-docs pull
  section0-docs status
  section0-docs push-test
  MESSAGE="Update concept notes" section0-docs commit
  section0-docs push

AFFiNE is read-only for this repo. Durable edits happen in Markdown, then the
projection operator pulls and projects.
USAGE
}

case "\${1:-help}" in
  configure)
    current_name="\$(git -C "\$REPO_DIR" config user.name || true)"
    current_email="\$(git -C "\$REPO_DIR" config user.email || true)"
    printf "Git author name [%s]: " "\$current_name"
    IFS= read -r author_name
    printf "Git author email [%s]: " "\$current_email"
    IFS= read -r author_email
    if [ -n "\$author_name" ]; then
      git -C "\$REPO_DIR" config user.name "\$author_name"
    elif [ -z "\$current_name" ]; then
      echo "Git author name is required" >&2
      exit 1
    fi
    if [ -n "\$author_email" ]; then
      git -C "\$REPO_DIR" config user.email "\$author_email"
    elif [ -z "\$current_email" ]; then
      echo "Git author email is required" >&2
      exit 1
    fi
    ;;
  doctor)
    remote="\$(git -C "\$REPO_DIR" remote get-url origin)"
    branch="\$(git -C "\$REPO_DIR" branch --show-current)"
    author_name="\$(git -C "\$REPO_DIR" config user.name || true)"
    author_email="\$(git -C "\$REPO_DIR" config user.email || true)"
    echo "Repo: \$REPO_DIR"
    echo "Remote: \$remote"
    echo "Branch: \$branch"
    if [ -n "\$author_name" ] && [ -n "\$author_email" ]; then
      echo "Git author: \$author_name <\$author_email>"
    else
      echo "Git author: missing; run section0-docs configure"
    fi
    git -C "\$REPO_DIR" ls-remote --heads origin main >/dev/null
    echo "Read access: ok"
    ;;
  open)
    printf "%s\n" "\$REPO_DIR"
    ;;
  pull)
    git -C "\$REPO_DIR" pull --ff-only
    ;;
  status)
    git -C "\$REPO_DIR" status --short --branch
    ;;
  commit)
    : "\${MESSAGE:?Set MESSAGE before running commit}"
    git -C "\$REPO_DIR" add .
    git -C "\$REPO_DIR" commit -m "\$MESSAGE"
    ;;
  push)
    git -C "\$REPO_DIR" push
    ;;
  push-test)
    branch="section0-smoke-\${USER:-user}-\$(date +%Y%m%d%H%M%S)"
    git -C "\$REPO_DIR" push origin HEAD:refs/heads/"\$branch"
    git -C "\$REPO_DIR" push origin :refs/heads/"\$branch"
    echo "Write access: ok"
    ;;
  help|--help|-h)
    usage
    ;;
  *)
    usage >&2
    exit 1
    ;;
esac
EOF
chmod +x "$COMMAND_PATH"

cat <<EOF
Ready.

Repo: $TARGET_DIR
Remote: $REPO_URL
Helper: $COMMAND_PATH

Daily flow:
  $COMMAND_NAME doctor
  $COMMAND_NAME pull
  # edit Markdown
  $COMMAND_NAME status
  MESSAGE="Update docs" $COMMAND_NAME commit
  $COMMAND_NAME push

Contributor setup:
  $COMMAND_NAME configure
  $COMMAND_NAME push-test

AFFiNE updates after the projection operator pulls and runs projection.

If $COMMAND_DIR is not on PATH, add this to your shell profile:
  export PATH="$COMMAND_DIR:\$PATH"
EOF