#!/bin/sh
# tests/run-tests.sh — lightweight test runner for session-tools.
#
# Each test file (tests/test_*.sh) defines one or more functions starting
# with `test_`. The runner sources every file, finds those functions, and
# invokes them with PS4 trace + per-test pass/fail tally. Exits non-zero on
# any failure.
#
# Conventions:
#   - Use the `assert_eq <expected> <actual> [msg]` helper.
#   - Tests should be isolated: each function builds its own fixtures.
#   - Tests must not require network or sudo.

set -u

ROOT=$(cd "$(dirname "$0")/.." && pwd)
TESTS_DIR=$ROOT/tests

pass=0; fail=0; failed_names=""

# ---------------------------------------------------------------------------
# Assertion helpers (available to every test file)
# ---------------------------------------------------------------------------

assert_eq() {
    _exp=$1; _got=$2; _msg=${3:-}
    if [ "$_exp" = "$_got" ]; then return 0; fi
    printf '  ✗ assertion failed%s\n    expected: %s\n    actual:   %s\n' \
        "${_msg:+: $_msg}" "$_exp" "$_got" >&2
    return 1
}

assert_contains() {
    _hay=$1; _needle=$2; _msg=${3:-}
    case $_hay in
        *"$_needle"*) return 0 ;;
    esac
    printf '  ✗ assertion failed%s\n    haystack: %s\n    missing:  %s\n' \
        "${_msg:+: $_msg}" "$_hay" "$_needle" >&2
    return 1
}

assert_exit() {
    _exp=$1; shift
    "$@" >/dev/null 2>&1
    _got=$?
    if [ "$_exp" -eq "$_got" ]; then return 0; fi
    printf '  ✗ exit assertion failed\n    expected: %s\n    actual:   %s\n    cmd:      %s\n' \
        "$_exp" "$_got" "$*" >&2
    return 1
}

# ---------------------------------------------------------------------------
# Runner
# ---------------------------------------------------------------------------

for tf in "$TESTS_DIR"/test_*.sh; do
    [ -f "$tf" ] || continue
    printf '\n── %s\n' "$(basename "$tf")"
    # shellcheck disable=SC1090
    . "$tf"
    # Find every `test_*` function defined by this file. POSIX has no
    # introspection, but the loaded source declared them; we grep the file
    # for `test_<name>()`.
    for name in $(grep -oE '^test_[A-Za-z0-9_]+\b' "$tf" | sort -u); do
        # Skip if grep matched a comment.
        if ! type "$name" >/dev/null 2>&1; then continue; fi
        if ( set -e; "$name" ); then
            printf '  ✓ %s\n' "$name"
            pass=$((pass + 1))
        else
            failed_names="$failed_names $name"
            fail=$((fail + 1))
        fi
        # Unset so the next file's same-named test (if any) reloads cleanly.
        unset -f "$name" 2>/dev/null || true
    done
done

printf '\n────────────────\n  %d passed, %d failed\n' "$pass" "$fail"
if [ "$fail" -gt 0 ]; then
    printf '  failed:%s\n' "$failed_names"
    exit 1
fi