#!/bin/bash
# Test suite for fgroups
# Usage: bash tests/run_tests.sh ./fgroups

BIN="${1:-./fgroups}"
GNU="groups"
PASS=0
FAIL=0
ERRORS=()

run_test() {
    local desc="$1"
    local args="$2"

    expected=$($GNU $args 2>&1)
    expected_exit=$?
    got=$($BIN $args 2>&1)
    got_exit=$?

    if [ "$expected" = "$got" ] && [ "$expected_exit" = "$got_exit" ]; then
        PASS=$((PASS+1))
    else
        FAIL=$((FAIL+1))
        ERRORS+=("FAIL: $desc")
        if [ "$expected" != "$got" ]; then
            ERRORS+=("  expected output: $(echo "$expected" | head -3)")
            ERRORS+=("  got output:      $(echo "$got" | head -3)")
        fi
        if [ "$expected_exit" != "$got_exit" ]; then
            ERRORS+=("  expected exit: $expected_exit, got: $got_exit")
        fi
    fi
}

run_test_exit_only() {
    local desc="$1"
    shift
    local args=("$@")

    $GNU "${args[@]}" > /dev/null 2>&1
    local expected_exit=$?
    $BIN "${args[@]}" > /dev/null 2>&1
    local got_exit=$?

    if [ "$expected_exit" = "$got_exit" ]; then
        PASS=$((PASS+1))
    else
        FAIL=$((FAIL+1))
        ERRORS+=("FAIL: $desc — expected exit: $expected_exit, got: $got_exit")
    fi
}

# ── Standard flags ──
run_test_exit_only "--help exit code" --help
run_test_exit_only "--version exit code" --version

# ── Tool-specific tests ──
run_test "basic groups (no args)" ""
run_test "groups for current user" "$(whoami)"
run_test "nonexistent user" "nonexistent_user_xyz_12345"

# ── Results ──
echo ""
echo "Results: $PASS passed, $FAIL failed out of $((PASS+FAIL)) tests"
for e in "${ERRORS[@]}"; do echo "  $e"; done
echo ""

if [ $FAIL -eq 0 ]; then
    echo "ALL TESTS PASSED"
    exit 0
else
    echo "$FAIL TESTS FAILED"
    exit 1
fi