#!/bin/sh
# tests/selfhost.sh - self-host integration test (plan todo 23).
#
# Proves stupidtools generates its OWN ./configure end to end: the tool
# (already built by `make`) reads the repo's stupid.kdl, emits ./configure
# into a TEMP dir, that configure produces a Makefile, and `make` builds a
# working stupidtools whose compile line used -std=c23. The generated
# configure/Makefile/binary live in the temp dir ONLY - the repo's own
# autotools bootstrap (configure.ac + Makefile.am) is never touched, and no
# in-tree residue is produced.
#
# POSIX sh only (dash/bash/zsh safe); no [[ ]], arrays, local, ==, <<<, &>.
# Exit 0 = pass, non-zero = fail. Fails fast on a hard setup error.

TOP_DIR=$(cd "$(dirname "$0")/.." && pwd) || {
    echo "FAIL: cannot resolve project root" >&2
    exit 1
}
BIN="$TOP_DIR/src/stupidtools"

TESTS_RUN=0
TESTS_FAILED=0

pass() {
    TESTS_RUN=$((TESTS_RUN + 1))
    printf 'ok %d - %s\n' "$TESTS_RUN" "$1"
}

fail() {
    TESTS_RUN=$((TESTS_RUN + 1))
    TESTS_FAILED=$((TESTS_FAILED + 1))
    printf 'not ok %d - %s\n' "$TESTS_RUN" "$1" >&2
}

# --- 1. the built binary must exist --------------------------------------
if [ -x "$BIN" ]; then
    pass "binary exists and is executable: $BIN"
else
    fail "binary missing: $BIN (run 'make' first)"
    printf 'FAILED: %d/%d checks failed\n' "$TESTS_FAILED" "$TESTS_RUN" >&2
    exit 1
fi

# --- temp dir (isolated; cleaned on every exit path) ---------------------
WORK=$(mktemp -d "${TMPDIR:-/tmp}/stupidtools-selfhost.XXXXXX") || {
    fail "cannot create temp dir"
    exit 1
}
cleanup() { rm -rf "$WORK"; }
trap cleanup EXIT HUP INT TERM

# --- 2. copy stupid.kdl + write a Makefile.in into the temp dir ----------
cp "$TOP_DIR/stupid.kdl" "$WORK/stupid.kdl" || {
    fail "cannot copy stupid.kdl into temp dir"
    exit 1
}

# The tool's own source list (repo-relative, kept in sync with stupid.kdl's
# `target` and src/Makefile.am). Prefixed with $TOP_DIR so the self-hosted
# build compiles the REAL sources from the isolated temp dir. The `\$(...)`
# escapes keep CC/CFLAGS/LIBS as MAKE variables (substituted by configure);
# `$SRCS` expands here (shell) into the absolute path list.
SRCS="$TOP_DIR/src/main.c $TOP_DIR/src/cli.c $TOP_DIR/src/error.c $TOP_DIR/src/span.c \
$TOP_DIR/src/kdl/lexer.c $TOP_DIR/src/kdl/parser.c $TOP_DIR/src/kdl/value.c $TOP_DIR/src/kdl/schema.c \
$TOP_DIR/src/detect/check_registry.c $TOP_DIR/src/detect/checks.c $TOP_DIR/src/detect/probe.c $TOP_DIR/src/detect/resolve.c \
$TOP_DIR/src/gen/sh_emit.c $TOP_DIR/src/gen/configure.c $TOP_DIR/src/gen/config.c $TOP_DIR/src/gen/args.c \
$TOP_DIR/src/ext/discovery.c $TOP_DIR/src/ext/lua.c $TOP_DIR/src/ext/abi.c $TOP_DIR/src/ext/api.c \
$TOP_DIR/src/ext/lang_c.c $TOP_DIR/src/ext/lang_cpp.c \
$TOP_DIR/thirdparty/lua/lapi.c $TOP_DIR/thirdparty/lua/lauxlib.c \
$TOP_DIR/thirdparty/lua/lbaselib.c $TOP_DIR/thirdparty/lua/lcode.c \
$TOP_DIR/thirdparty/lua/lctype.c $TOP_DIR/thirdparty/lua/ldebug.c \
$TOP_DIR/thirdparty/lua/ldo.c $TOP_DIR/thirdparty/lua/ldump.c \
$TOP_DIR/thirdparty/lua/lfunc.c $TOP_DIR/thirdparty/lua/lgc.c \
$TOP_DIR/thirdparty/lua/llex.c $TOP_DIR/thirdparty/lua/lmem.c \
$TOP_DIR/thirdparty/lua/lobject.c $TOP_DIR/thirdparty/lua/lopcodes.c \
$TOP_DIR/thirdparty/lua/lparser.c $TOP_DIR/thirdparty/lua/lstate.c \
$TOP_DIR/thirdparty/lua/lstring.c $TOP_DIR/thirdparty/lua/ltable.c \
$TOP_DIR/thirdparty/lua/ltm.c $TOP_DIR/thirdparty/lua/lundump.c \
$TOP_DIR/thirdparty/lua/lvm.c $TOP_DIR/thirdparty/lua/lzio.c \
$TOP_DIR/thirdparty/lua/lstrlib.c $TOP_DIR/thirdparty/lua/ltablib.c"

cat > "$WORK/Makefile.in" <<EOF
CC = @CC@
CFLAGS = @CFLAGS@ -std=c23 -Wall -Wextra -Wpedantic -I$TOP_DIR/src
LIBS = @LIBS@
prefix = @prefix@

all: stupidtools

stupidtools: $SRCS
	\$(CC) \$(CFLAGS) $SRCS -o stupidtools \$(LIBS)

clean:
	rm -f stupidtools
EOF
pass "copied stupid.kdl + wrote Makefile.in"

# --- 3. generate ./configure from stupid.kdl ------------------------------
# Isolate from the dev environment's extensions (XDG_DATA_HOME to a
# nonexistent dir, STUPIDTOOLS_EXT emptied) so only the builtin modules
# load. The binary writes ./configure to the CWD (the temp dir).
if (cd "$WORK" && XDG_DATA_HOME="$WORK/xdg" STUPIDTOOLS_EXT= \
        "$BIN" stupid.kdl >gen.log 2>&1); then
    if [ -s "$WORK/configure" ]; then
        pass "stupidtools generated a non-empty ./configure"
    else
        fail "stupidtools exited 0 but wrote no ./configure (see $WORK/gen.log)"
    fi
else
    rc=$?
    fail "stupidtools failed on stupid.kdl (rc=$rc): $(cat "$WORK/gen.log" 2>/dev/null)"
fi

# --- 4. run ./configure -> Makefile --------------------------------------
if [ -s "$WORK/configure" ]; then
    if sh -n "$WORK/configure" 2>"$WORK/configure.n.err"; then
        pass "generated ./configure passes sh -n (POSIX syntax)"
    else
        fail "generated ./configure fails sh -n: $(cat "$WORK/configure.n.err" 2>/dev/null)"
    fi

    if (cd "$WORK" && sh ./configure >config.log 2>&1); then
        if [ -s "$WORK/Makefile" ]; then
            pass "./configure ran and wrote a non-empty Makefile"
        else
            fail "./configure exited 0 but wrote no Makefile (see $WORK/config.log)"
        fi
    else
        rc=$?
        fail "./configure failed (rc=$rc): $(cat "$WORK/config.log" 2>/dev/null)"
    fi
else
    fail "skipping configure run (no ./configure was generated)"
fi

# --- 5+6. build with make V=1 and assert -std=c23 ------------------------
if [ -s "$WORK/Makefile" ]; then
    if command -v timeout >/dev/null 2>&1; then
        timeout 300 make -C "$WORK" V=1 >"$WORK/make.log" 2>&1
        make_rc=$?
    else
        make -C "$WORK" V=1 >"$WORK/make.log" 2>&1
        make_rc=$?
    fi
    if [ "$make_rc" -eq 0 ] && [ -x "$WORK/stupidtools" ]; then
        pass "make built a stupidtools binary in the temp dir"
    else
        fail "make failed (rc=$make_rc): $(tail -n 5 "$WORK/make.log" 2>/dev/null)"
    fi

    if grep -q -- '-std=c23' "$WORK/make.log"; then
        pass "self-hosted compile line used -std=c23"
    else
        fail "compile line did NOT contain -std=c23 (see $WORK/make.log)"
    fi
else
    fail "skipping make (no Makefile was written)"
fi

# --- 7. the self-hosted binary must run ----------------------------------
if [ -x "$WORK/stupidtools" ]; then
    if version_out=$("$WORK/stupidtools" --version 2>&1); then
        if [ "$version_out" = "stupidtools 1.0.0" ]; then
            pass "self-hosted binary --version reports: $version_out"
        else
            fail "self-hosted --version unexpected: '$version_out'"
        fi
    else
        rc=$?
        fail "self-hosted --version exited non-zero (rc=$rc): $version_out"
    fi
else
    fail "skipping --version check (no self-hosted binary was built)"
fi

# --- summary -------------------------------------------------------------
if [ "$TESTS_FAILED" -ne 0 ]; then
    printf 'FAILED: %d/%d checks failed\n' "$TESTS_FAILED" "$TESTS_RUN" >&2
    exit 1
fi
printf 'All %d self-host checks passed.\n' "$TESTS_RUN"