#!/usr/bin/env bash
# Regression harness for durable Gitea PR review comments (#812).

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
WORK_DIR="${MOSAIC_TEST_WORK_DIR:-$PWD/.mosaic-test-work/pr-review-gitea-comment}"
REPO_DIR="$WORK_DIR/repo"
BIN_DIR="$WORK_DIR/bin"
LOG_FILE="$WORK_DIR/tea.log"
OUTPUT_FILE="$WORK_DIR/output.log"

cleanup() {
    rm -rf "$WORK_DIR"
}
trap cleanup EXIT

mkdir -p "$REPO_DIR" "$BIN_DIR"
git -C "$REPO_DIR" init -q
git -C "$REPO_DIR" remote add origin https://git.mosaicstack.dev/mosaicstack/stack.git

cat > "$BIN_DIR/tea" <<'SH'
#!/usr/bin/env bash
set -euo pipefail

printf '%s\n' "$*" >> "$PR_REVIEW_TEST_LOG"

if [[ "$*" == "login list --output json" ]]; then
    printf '%s\n' '[{"name":"mosaicstack","url":"https://git.mosaicstack.dev"}]'
    exit 0
fi

case "${PR_REVIEW_TEST_MODE:-}" in
    approve)
        [[ "$*" == "pr approve 123 --repo mosaicstack/stack --login mosaicstack" ]] || exit 90
        ;;
    request-changes)
        [[ "$*" == "pr reject 123 --repo mosaicstack/stack --login mosaicstack --comment changes-required" ]] || exit 91
        ;;
    legacy-fallback)
        if [[ "$*" == pr\ comment* ]]; then
            # tea v0.11.1 treats the nonexistent subcommand as `tea pr list` and exits 0.
            printf '%s\n' 'INDEX TITLE STATE'
            exit 0
        fi
        if [[ "$*" == comment* ]]; then
            printf '%s\n' 'supported comment write deliberately unavailable' >&2
            exit 23
        fi
        exit 92
        ;;
    comment-success|readback-failure)
        if [[ "$*" == "comment 123 durable-body --login mosaicstack --repo mosaicstack/stack --output json" ]]; then
            printf '%s\n' '{"id":456,"body":"durable-body"}'
            exit 0
        fi
        if [[ "$*" == "api --login mosaicstack /repos/mosaicstack/stack/issues/comments/456" ]]; then
            if [[ "$PR_REVIEW_TEST_MODE" == "readback-failure" ]]; then
                printf '%s\n' '{"id":456,"body":"different-body","issue_url":"https://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/123"}'
            else
                printf '%s\n' '{"id":456,"body":"durable-body","issue_url":"https://git.mosaicstack.dev/api/v1/repos/mosaicstack/stack/issues/123"}'
            fi
            exit 0
        fi
        if [[ "$*" == pr\ comment* ]]; then
            # Reproduce the old false-positive fallback if the wrapper regresses.
            printf '%s\n' 'INDEX TITLE STATE'
            exit 0
        fi
        exit 93
        ;;
    write-failure)
        if [[ "$*" == "comment 123 durable-body --login mosaicstack --repo mosaicstack/stack --output json" ]]; then
            printf '%s\n' 'provider rejected comment' >&2
            exit 24
        fi
        exit 94
        ;;
    *)
        exit 95
        ;;
esac
SH
chmod +x "$BIN_DIR/tea"

run_review() {
    local mode="$1" action="$2" comment="${3:-}"
    : > "$LOG_FILE"
    : > "$OUTPUT_FILE"
    (
        cd "$REPO_DIR"
        PATH="$BIN_DIR:$PATH" \
        PR_REVIEW_TEST_LOG="$LOG_FILE" \
        PR_REVIEW_TEST_MODE="$mode" \
        "$SCRIPT_DIR/pr-review.sh" -n 123 -a "$action" ${comment:+-c "$comment"}
    ) > "$OUTPUT_FILE" 2>&1
}

run_review approve approve
grep -q '^pr approve 123 --repo mosaicstack/stack --login mosaicstack$' "$LOG_FILE"
grep -q 'Approved Gitea PR #123' "$OUTPUT_FILE"

run_review request-changes request-changes changes-required
grep -q '^pr reject 123 --repo mosaicstack/stack --login mosaicstack --comment changes-required$' "$LOG_FILE"
grep -q 'Requested changes on Gitea PR #123' "$OUTPUT_FILE"

if run_review legacy-fallback comment durable-body; then
    echo "The old nonexistent tea pr comment fallback returned success" >&2
    cat "$OUTPUT_FILE" >&2
    exit 1
fi
if grep -q '^pr comment ' "$LOG_FILE"; then
    echo "Wrapper invoked unsupported tea pr comment" >&2
    exit 1
fi
if grep -q 'Added comment to Gitea PR' "$OUTPUT_FILE"; then
    echo "Wrapper reported success without durable persistence" >&2
    exit 1
fi

run_review comment-success comment durable-body
grep -q '^comment 123 durable-body --login mosaicstack --repo mosaicstack/stack --output json$' "$LOG_FILE"
grep -q '^api --login mosaicstack /repos/mosaicstack/stack/issues/comments/456$' "$LOG_FILE"
grep -q 'Added and verified comment on Gitea PR #123' "$OUTPUT_FILE"

if run_review write-failure comment durable-body; then
    echo "Expected provider write failure to return nonzero" >&2
    exit 1
fi
if grep -q 'Added and verified comment' "$OUTPUT_FILE"; then
    echo "Write failure reported durable success" >&2
    exit 1
fi

if run_review readback-failure comment durable-body; then
    echo "Expected mismatched provider read-back to return nonzero" >&2
    exit 1
fi
if grep -q 'Added and verified comment' "$OUTPUT_FILE"; then
    echo "Read-back mismatch reported durable success" >&2
    exit 1
fi

echo "pr-review.sh durable Gitea comment regression passed"