#!/bin/bash

# ============================================================================
# Refuse to commit anything that identifies a real person.
#
# The logic is check_personal_data.py; this half exists to list what git
# tracks, which keeps the Python free of a subprocess call it would otherwise
# need a lint suppression for.
#
#   scripts/check_personal_data.sh --all        every tracked file
#   scripts/check_personal_data.sh a.py b.md    named files
#   scripts/check_personal_data.sh --message .git/COMMIT_EDITMSG
# ============================================================================

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
readonly SCRIPT_DIR
REPO_ROOT="$(dirname "$SCRIPT_DIR")"
readonly REPO_ROOT
readonly CHECKER="${SCRIPT_DIR}/check_personal_data.py"

# The repo's own interpreter when there is one, so the check runs the same
# way under pre-commit, in CI and by hand.
PYTHON="${PYTHON:-${REPO_ROOT}/.venv/bin/python}"
if [[ ! -x "$PYTHON" ]]; then
    PYTHON="$(command -v python3)"
fi
readonly PYTHON

usage() {
    echo "Usage: $(basename "$0") [--all | --message FILE | FILE...]"
    exit 0
}

main() {
    if [[ $# -eq 0 ]]; then
        usage
    fi

    case "$1" in
        -h | --help)
            usage
            ;;
        --message)
            if [[ $# -lt 2 ]]; then
                echo "Error: --message needs a file" >&2
                exit 1
            fi
            "$PYTHON" "$CHECKER" --message "$2"
            ;;
        --all)
            local files=()
            mapfile -t files < <(git -C "$REPO_ROOT" ls-files)
            if [[ ${#files[@]} -eq 0 ]]; then
                echo "Error: git tracks no files here" >&2
                exit 1
            fi
            # Prefixed with the repo root so this works from any directory.
            local paths=()
            local file
            for file in "${files[@]}"; do
                paths+=("${REPO_ROOT}/${file}")
            done
            "$PYTHON" "$CHECKER" --files "${paths[@]}"
            ;;
        *)
            "$PYTHON" "$CHECKER" --files "$@"
            ;;
    esac
}

main "$@"