#!/usr/bin/env bash
# Writes THIRD-PARTY-NOTICES.txt from the crate graph `didbot-pds` links.
#
# `--check` regenerates into a temporary file and diffs, which is what the
# prek hook runs: a dependency change that moves the graph fails here until
# the notices are regenerated and staged, the same shape as the plan register.
set -euo pipefail

root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
out="$root/THIRD-PARTY-NOTICES.txt"

if ! cargo about --version >/dev/null 2>&1; then
    echo "gen-notices: cargo-about is the tool this reads the graph with." >&2
    echo "  cargo install --locked --features cli cargo-about" >&2
    exit 1
fi

generate() {
    cargo about generate \
        --locked \
        --manifest-path "$root/crates/didbot-serve/Cargo.toml" \
        --features route53 \
        --config "$root/about.toml" \
        "$root/about.hbs" \
        --output-file "$1"
}

if [ "${1-}" = "--check" ]; then
    tmp="$(mktemp)"
    trap 'rm -f "$tmp"' EXIT
    generate "$tmp"
    if ! diff -u "$out" "$tmp"; then
        echo "gen-notices: THIRD-PARTY-NOTICES.txt is behind the graph." >&2
        echo "  run scripts/gen-notices.sh and stage the result" >&2
        exit 1
    fi
    exit 0
fi

generate "$out"
echo "gen-notices: wrote $out"