#!/usr/bin/env bash
# Replay host fixtures: run `deps.sh detect all` against a stand-in machine and check
# what it must (and must not) say. No docker, no network, no root.
# Usage: hosttest.sh [FIXTURE_DIR...]    default: tests/hosts/*    exits 1 on a mismatch
# A fixture is root/ (the files detect reads), expect.txt (+ must appear, - must not,
# exit N), and an optional env (KEY=value lines). `deps.sh snapshot` writes one.
# Notes: docs/notes/installer-testing.md
set -uo pipefail
cd "$(dirname "$0")"

dirs=("$@")
if [ ${#dirs[@]} -eq 0 ]; then dirs=(../tests/hosts/*/); fi

rc=0 passed=0 failed=0
for d in "${dirs[@]}"; do
    d="${d%/}"
    if [ ! -f "$d/expect.txt" ]; then
        echo "  FAIL  $d: no expect.txt — not a host fixture" >&2
        rc=1; failed=$((failed + 1)); continue
    fi
    # Only the fixture's own settings: the caller's HOST_ROOT, MEMINFO or UNAME_S
    # must not leak into a replay.
    run=(env -u HOST_ROOT -u MEMINFO -u OVERCOMMIT_FILE -u UNAME_S)
    if [ -d "$d/root" ]; then run+=(HOST_ROOT="$(cd "$d/root" && pwd)"); fi
    if [ -f "$d/env" ]; then
        while IFS= read -r kv; do run+=("$kv"); done < <(grep -vE '^[[:space:]]*(#|$)' "$d/env")
    fi
    out=$("${run[@]}" bash ./deps.sh detect all 2>&1)
    code=$?

    bad=""
    want_exit=0
    while IFS= read -r line; do
        case "$line" in
            '+ '*)    grep -qF -- "${line#+ }" <<< "$out" || bad+=$'\n'"        missing: ${line#+ }" ;;
            '- '*)    grep -qF -- "${line#- }" <<< "$out" && bad+=$'\n'"        present: ${line#- }" ;;
            'exit '*) want_exit="${line#exit }" ;;
        esac
    done < <(grep -vE '^[[:space:]]*(#|$)' "$d/expect.txt")
    if [ "$code" != "$want_exit" ]; then bad+=$'\n'"        exit:    $code, wanted $want_exit"; fi

    if [ -z "$bad" ]; then
        printf '  ok    %s\n' "$(basename "$d")"
        passed=$((passed + 1))
    else
        printf '  FAIL  %s%s\n' "$(basename "$d")" "$bad"
        rc=1; failed=$((failed + 1))
    fi
done

printf '%d host fixture(s) as expected, %d not\n' "$passed" "$failed"
exit "$rc"