#!/usr/bin/env bash
# Debug-stepping smoke (ERR E3.0 slice 3e, rung 1: macOS native).
#
# Verifies the DWARF emitted by `sx build --emit-obj` actually drives
# source-level stepping in lldb — the deep-debug half of the trace story.
# NOT part of `run_examples.sh` (it needs `lldb`, and is macOS-specific via the
# debug-map → kept `.o`). Run manually:  bash tests/debug_stepping_smoke.sh
#
# Exit 0 = lldb resolved a file:line breakpoint + a source-mapped backtrace.

set -u
ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
SX="$ROOT_DIR/zig-out/bin/sx"
TMP="$ROOT_DIR/.sx-tmp"
SRC="$TMP/dbg_smoke.sx"
BIN="$TMP/dbg_smoke"

if ! command -v lldb >/dev/null 2>&1; then
    echo "SKIP: lldb not found (macOS/Xcode tools required)"
    exit 0
fi

mkdir -p "$TMP"
cat > "$SRC" <<'EOF'
add :: (a: s32, b: s32) -> s32 {
    c := a + b;
    return c;
}
main :: () -> s32 {
    return add(40, 2);
}
EOF

"$SX" build --emit-obj "$SRC" -o "$BIN" >/dev/null 2>&1 || { echo "FAIL: build"; exit 1; }

# Breakpoint on the `return c;` line; expect lldb to resolve it + a backtrace
# mapping both frames to dbg_smoke.sx.
out=$(cd "$ROOT_DIR" && lldb --batch \
    -o "breakpoint set --file dbg_smoke.sx --line 3" \
    -o "run" -o "bt" -o "quit" "$BIN" 2>&1)

rm -f "$SRC" "$BIN" "$TMP/main.o"

fail=0
echo "$out" | grep -q "dbg_smoke.sx:3" || { echo "FAIL: breakpoint did not resolve to dbg_smoke.sx:3"; fail=1; }
echo "$out" | grep -q "add at dbg_smoke.sx:3" || { echo "FAIL: stopped frame not source-mapped"; fail=1; }
echo "$out" | grep -q "main at dbg_smoke.sx:6" || { echo "FAIL: caller frame not source-mapped"; fail=1; }

if [[ $fail -eq 0 ]]; then
    echo "ok: lldb stepped sx source (breakpoint + backtrace resolved via DWARF)"
    exit 0
fi
echo "--- lldb output ---"; echo "$out"
exit 1