# Narrow test: load ONLY ch=5 Nexus -> open GUI ch=5. Is multi-instance the trigger?
import ctypes, ctypes.wintypes as w, struct, subprocess, sys, os, time

sys.stdout.reconfigure(encoding='utf-8', errors='replace')

SHM_NAME = "SonicForge_DAW_IPC_NARROW"
SIZE = 32768
BRIDGE = r"C:\Users\locpham\SonicForgeStudio\native_bridge\build\Release\daw_vst_bridge.exe"
LOG = os.path.join(os.path.dirname(os.path.abspath(__file__)), "narrow_bridge.log")
NEXUS = r"C:\Program Files\Common Files\VST3\Nexus.vst3"

kernel32 = ctypes.windll.kernel32
kernel32.CreateFileMappingA.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD, ctypes.c_char_p]
kernel32.CreateFileMappingA.restype = ctypes.c_void_p
kernel32.MapViewOfFile.argtypes = [ctypes.c_void_p, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD, ctypes.wintypes.DWORD, ctypes.c_size_t]
kernel32.MapViewOfFile.restype = ctypes.c_void_p
INVALID_HANDLE_VALUE = ctypes.c_void_p(-1).value
PAGE_READWRITE = 0x04
FILE_MAP_ALL_ACCESS = 0xF001F

hMap = kernel32.CreateFileMappingA(INVALID_HANDLE_VALUE, None, PAGE_READWRITE, 0, SIZE, SHM_NAME.encode())
if not hMap:
    print("CreateFileMapping failed", ctypes.get_last_error()); sys.exit(1)
ptr = kernel32.MapViewOfFile(hMap, FILE_MAP_ALL_ACCESS, 0, 0, 0)
if not ptr:
    print("MapViewOfFile failed", ctypes.get_last_error()); sys.exit(1)

def w32(off, fmt, *args):
    ctypes.memmove(ptr + off, struct.pack(fmt, *args), struct.calcsize(fmt))

def write_control(type_, arg0, arg1, ch, path):
    for i in range(8):
        off = 2836 + i * 1040
        t = ctypes.c_uint32.from_address(ptr + off).value
        if t == 0:
            w32(off, 'IIII', type_, arg0, arg1, ch)
            if path:
                b = path.encode('utf-8')[:1023] + b'\x00'
                ctypes.memmove(ptr + off + 16, b, len(b))
            return i
    raise RuntimeError("control queue full")

def push_controls(events):
    for i in range(8):
        w32(2836 + i * 1040, 'I', 0)
    w32(11156, 'I', 0)
    n = 0
    for (type_, arg0, arg1, ch, path) in events:
        write_control(type_, arg0, arg1, ch, path)
        n += 1
    w32(11156, 'I', n)

def wait_log(pattern, timeout, since=0):
    end = time.time() + timeout
    lines = []
    try:
        with open(LOG, 'r', encoding='utf-8', errors='replace') as f:
            lines = f.readlines()
    except FileNotFoundError:
        pass
    last = max(0, len(lines) - since)
    while time.time() < end:
        try:
            with open(LOG, 'r', encoding='utf-8', errors='replace') as f:
                lines = f.readlines()
        except FileNotFoundError:
            lines = []
        for i in range(last, len(lines)):
            if pattern in lines[i]:
                return lines[i].strip()
        last = max(0, len(lines))
        time.sleep(0.2)
    return None

proc = subprocess.Popen(
    [BRIDGE, "--shm", SHM_NAME],
    env={**os.environ, "SF_SHM_NAME": SHM_NAME, "SF_PARENT_PID": str(os.getpid()),
         "SF_SAMPLE_RATE": "48000", "SF_BLOCK_SIZE": "256"},
    stdout=open(LOG, 'wb'), stderr=subprocess.STDOUT,
)
time.sleep(1.5)
print("bridge pid", proc.pid, "poll", proc.poll())

print("[1] load ch=5 Nexus only...")
push_controls([(2, 0, 0, 5, NEXUS)])
r = wait_log("instrument loaded ch=5", 60)
print("   ", r)

print("[2] open GUI ch=5...")
push_controls([(4, 0, 0, 5, "nexus")])
r = wait_log("GUI attached", 30)
print("   ", r)

time.sleep(2)
print("alive:", proc.poll() is None)
print("--- last 20 log lines ---")
with open(LOG, 'r', encoding='utf-8', errors='replace') as f:
    for l in f.readlines()[-20:]:
        print(l.rstrip())

kernel32.UnmapViewOfFile(ptr)
kernel32.CloseHandle(hMap)
try:
    proc.terminate()
except Exception:
    pass
print("done")