#!/usr/bin/env bash
# check_the_checker for scripts/agent-git (improvise-1xfb.3). A throwaway repo
# whose only identity is its own config; no global or system git config.
set -uo pipefail

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
RUN="$here/agent-git"
work="$(mktemp -d)"
trap 'rm -rf "$work"' EXIT

export GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_NOSYSTEM=1
unset GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL

pass=0; fail=0
ok()  { printf '  ok   %s\n' "$1"; pass=$((pass+1)); }
bad() { printf '  FAIL %s (%s)\n' "$1" "$2"; fail=$((fail+1)); }

# $1 name, $2 wanted, $3 got
same() { if [ "$2" = "$3" ]; then ok "$1"; else bad "$1" "got '$3', wanted '$2'"; fi; }

repo="$work/repo"
git init -q "$repo"
git -C "$repo" config user.name Owner
git -C "$repo" config user.email owner@example.com
git -C "$repo" commit -q --allow-empty -m base
cd "$repo" || exit 1
base="$(git rev-parse HEAD)"

# The refusals: nothing may be committed, since the commit would be the owner's.
(unset BEADS_ACTOR; "$RUN" commit -q --allow-empty -m unset) > "$work/out" 2>&1
same "an unset BEADS_ACTOR is refused" 2 "$?"
grep -q 'BEADS_ACTOR is unset' "$work/out" && ok "the refusal names BEADS_ACTOR" \
  || bad "the refusal names BEADS_ACTOR" "$(head -c 200 "$work/out")"
BEADS_ACTOR='' "$RUN" commit -q --allow-empty -m empty > /dev/null 2>&1
same "an empty BEADS_ACTOR is refused" 2 "$?"
same "a refusal commits nothing" "$base" "$(git rev-parse HEAD)"

# A commit: the author is the agent, and nothing else about the identity moves.
BEADS_ACTOR=agent-a1 "$RUN" commit -q --allow-empty -m one
same "the author is Claude (<actor>)" 'Claude (agent-a1)' "$(git log -1 --format=%an)"
same "the author email is the configured one" owner@example.com "$(git log -1 --format=%ae)"
same "the committer is untouched" 'Owner <owner@example.com>' "$(git log -1 --format='%cn <%ce>')"
same "shared config is untouched" Owner "$(git config user.name)"

# A merge commit is authored too; a plain amend keeps the agent as author.
git checkout -q -b side "$base"
BEADS_ACTOR=agent-b2 "$RUN" commit -q --allow-empty -m side
git checkout -q -
BEADS_ACTOR=agent-a1 "$RUN" merge -q --no-edit side
same "a merge commit is authored by the agent" 'Claude (agent-a1)' "$(git log -1 --format=%an)"
same "the merge has two parents" 2 "$(git log -1 --format=%P | wc -w | tr -d ' ')"

# A cherry-pick keeps its source's author, whatever the wrapper sets.
git checkout -q -b pick "$base"
BEADS_ACTOR=agent-a1 "$RUN" cherry-pick -x --allow-empty "$(git rev-parse side)" > /dev/null 2>&1
same "a cherry-pick keeps its source's author" 'Claude (agent-b2)' "$(git log -1 --format=%an)"
git checkout -q -

# git's own failure is passed through, not swallowed.
BEADS_ACTOR=agent-a1 "$RUN" commit -q -m nothing-staged > /dev/null 2>&1
rc=$?
[ "$rc" != 0 ] && ok "git's own failure is passed through" \
  || bad "git's own failure is passed through" "exit 0"

printf '\nagent-git-test: %d passed, %d failed\n' "$pass" "$fail"
[ "$fail" = 0 ]