"""
Standalone vision pipeline test script.

Captures frames every 2 seconds, runs gesture/affect/VLM scene detection,
stores results in a 30-second rolling buffer.  Press Enter to dump the buffer
state, q + Enter to quit.

Usage:
    cd "j:\\My Drive\\UB\\SPRING 26\\cse635\\Term Project\\final_architecture"
    python scripts/test_vision_pipeline.py
"""

from __future__ import annotations

import sys
import time
from collections import deque
from dataclasses import dataclass
from typing import Optional

import cv2
import numpy as np
from PIL import Image

# ── Constants ─────────────────────────────────────────────────────────────────

BUFFER_MAXLEN    = 15       # 15 × 2 s = 30 seconds
CAPTURE_INTERVAL = 2.0      # seconds between frames
SCENE_SIZE       = 512      # pixels for VLM resize
CONFIG_PATH      = "memorybridge/config/settings.yaml"
SCENE_PROMPT     = (
    "Look at this image and respond with ONE of the following:\n"
    "- If you see a clear smile or positive expression: 'smiling'\n"
    "- If you see a frustrated, angry, or negative expression: 'frustrated'\n"
    "- If you see a surprised expression: 'surprised'\n"
    "- If you see an object being held up or introduced (not a hand gesture): "
    "describe the object in 3 words max, e.g. 'holding phone', 'showing cat photo'\n"
    "- If you see a thumbs up, thumbs down, pointing, or other hand gesture: "
    "name it in 2 words, e.g. 'thumbs up'\n"
    "- If nothing significant: respond exactly 'no_signal'\n\n"
    "Respond with ONLY one of these options. No other text."
)


# ── Test-only data structure (NOT in production schemas) ──────────────────────

@dataclass
class TestFrame:
    timestamp: float
    snapshot: object        # VisionSnapshot — imported at runtime
    scene_description: str


# ── Camera helpers ────────────────────────────────────────────────────────────

def _open_camera() -> cv2.VideoCapture:
    cap = cv2.VideoCapture(0)
    if not cap.isOpened():
        print("[ERROR] Cannot open camera (VideoCapture(0) failed).", file=sys.stderr)
        sys.exit(1)
    cap.set(cv2.CAP_PROP_FRAME_WIDTH,  640)
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)
    return cap


def _capture_frame(cap: cv2.VideoCapture) -> Optional[np.ndarray]:
    ret, frame = cap.read()
    return frame if ret else None


# ── VLM scene description ─────────────────────────────────────────────────────

def _call_vlm_scene(vlm, bgr_frame: np.ndarray) -> str:
    try:
        resized = cv2.resize(bgr_frame, (SCENE_SIZE, SCENE_SIZE))
        rgb     = cv2.cvtColor(resized, cv2.COLOR_BGR2RGB)
        pil_img = Image.fromarray(rgb)

        # Moondream path: exposes encode_image() + query()
        if hasattr(vlm, "encode_image") and hasattr(vlm, "query"):
            encoded = vlm.encode_image(pil_img)
            answer  = vlm.query(encoded, SCENE_PROMPT)
            if isinstance(answer, dict):
                return answer.get("answer", "").strip()
            return str(answer).strip()

        # LangChain cloud VLM path
        import base64, io
        from langchain_core.messages import HumanMessage
        buf = io.BytesIO()
        pil_img.save(buf, format="JPEG")
        b64 = base64.b64encode(buf.getvalue()).decode("utf-8")
        msg = HumanMessage(content=[
            {"type": "text",      "text": SCENE_PROMPT},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{b64}"}},
        ])
        return vlm.invoke([msg]).content.strip()

    except Exception as exc:
        print(f"[VLM] Scene description error: {exc}", file=sys.stderr)
        return "(VLM error)"


# ── Main per-frame logic ──────────────────────────────────────────────────────

def _run_frame(cap, gesture_det, affect_det, air_sign_det, vlm):
    from memorybridge.core.schemas import AirSignChar, VisionSnapshot

    bgr = _capture_frame(cap)
    if bgr is None:
        print("[WARN] Frame capture failed — skipping.", file=sys.stderr)
        return None

    # Gesture
    gesture_signals = gesture_det.detect(bgr) or []

    # Affect
    affect_signal = affect_det.detect(bgr)

    # Air-sign (sync camera-loop path)
    air_sign_char: Optional[AirSignChar] = None
    tip = gesture_det.get_fingertip()
    now = time.monotonic()
    n_pts, should_fire, _ = air_sign_det.update_trajectory_from_tip(tip, now)
    if should_fire:
        canvas = air_sign_det._render_trajectory()
        air_sign_det._reset()
        letter = air_sign_det.call_vlm_sync(canvas, n_pts)
        if letter is not None:
            air_sign_char = AirSignChar(
                character=letter,
                confidence=0.85,
                timestamp=time.time(),
            )
            print(f"[AirSign] Confirmed letter: {letter}", file=sys.stderr)

    # Scene description from VLM
    scene_description = _call_vlm_scene(vlm, bgr)

    snapshot = VisionSnapshot(
        timestamp=time.time(),
        gestures=gesture_signals,
        affect=affect_signal,
        air_sign_char=air_sign_char,
    )

    return TestFrame(
        timestamp=snapshot.timestamp,
        snapshot=snapshot,
        scene_description=scene_description,
    )


# ── Deduplication ─────────────────────────────────────────────────────────────

def _is_no_signal(frame: TestFrame) -> bool:
    return "no_signal" in frame.scene_description.lower()


def _is_duplicate(last: Optional[TestFrame], new: TestFrame) -> bool:
    """Compare only against the last frame that had a real behavioral signal."""
    if last is None:
        return False

    def top_gesture(frame: TestFrame) -> str:
        if frame.snapshot.gestures:
            return frame.snapshot.gestures[0].gesture_class
        return "neutral"

    same_gesture = top_gesture(last) == top_gesture(new)
    same_scene   = last.scene_description == new.scene_description
    return same_gesture and same_scene


# ── Display helpers ───────────────────────────────────────────────────────────

def _fmt_time(ts: float) -> str:
    import datetime
    return datetime.datetime.fromtimestamp(ts).strftime("%H:%M:%S.%f")[:-3]


def _print_frame(frame: TestFrame, index: int) -> None:
    snap = frame.snapshot

    top_g = "None"
    if snap.gestures:
        g = snap.gestures[0]
        top_g = f"{g.gesture_class} (conf={g.confidence:.2f})"

    aff = "None"
    if snap.affect is not None:
        a = snap.affect
        aff = f"{a.affect_class} (conf={a.confidence:.2f})"

    air = "None"
    if snap.air_sign_char is not None:
        air = f"'{snap.air_sign_char.character}' (conf={snap.air_sign_char.confidence:.2f})"

    print(f"\n[Frame {index} | {_fmt_time(frame.timestamp)}]")
    print(f"  Gesture  : {top_g}")
    print(f"  Affect   : {aff}")
    print(f"  Air-Sign : {air}")
    print(f"  Scene    : {frame.scene_description}")


def _print_buffer_state(test_buffer: deque, signal_buffer) -> None:
    print("\n" + "=" * 60)
    print(f"  BUFFER STATE  ({len(test_buffer)} frames stored)")
    print("=" * 60)

    for i, frame in enumerate(test_buffer):
        _print_frame(frame, i + 1)

    print("\n── Aggregated signals ──")
    state = signal_buffer.get_state_sync()

    if state.aggregated_gesture:
        g = state.aggregated_gesture
        print(f"  Gesture  : {g.gesture_class} (conf={g.confidence:.2f})")
    else:
        print("  Gesture  : None (all neutral)")

    if state.aggregated_affect:
        a = state.aggregated_affect
        print(f"  Affect   : {a.affect_class} (conf={a.confidence:.2f})")
    else:
        print("  Affect   : None (no dominant class)")

    if state.air_sign_sequence:
        letters = "".join(c.character for c in state.air_sign_sequence)
        print(f"  Air-Sign : confirmed sequence = '{letters}'")
    else:
        print("  Air-Sign : (none confirmed)")

    print("=" * 60)


# ── Keyboard input (Windows — msvcrt) ────────────────────────────────────────

def _check_keypress() -> Optional[str]:
    try:
        import msvcrt
        if msvcrt.kbhit():
            return msvcrt.getch().decode("utf-8", errors="ignore")
    except ImportError:
        pass
    return None


# ── Main ──────────────────────────────────────────────────────────────────────

def main() -> None:
    print("Initialising MemoryBridge vision pipeline test…")
    print(f"  Buffer: {BUFFER_MAXLEN} frames × {CAPTURE_INTERVAL:.0f}s = {BUFFER_MAXLEN * int(CAPTURE_INTERVAL)}s window")

    # Load registry + VLM
    from memorybridge.core.models import ModelRegistry
    registry = ModelRegistry(CONFIG_PATH)
    print("  Loading VLM (may take a moment on first run)…", end="", flush=True)
    vlm = registry.get_vlm()
    print(" done.")

    # Vision detectors
    from memorybridge.vision_path.gesture_detector import GestureDetector
    from memorybridge.vision_path.affect_detector   import AffectDetector
    from memorybridge.vision_path.air_sign_detector import AirSignDetector
    from memorybridge.vision_path.signal_buffer     import SignalBuffer

    gesture_det  = GestureDetector()
    affect_det   = AffectDetector()
    air_sign_det = AirSignDetector(registry)
    signal_buffer = SignalBuffer(
        buffer_size=BUFFER_MAXLEN,
        air_sign_confirmation_windows=2,
    )

    # Test-side deque (mirrors signal_buffer for display)
    test_buffer: deque[TestFrame] = deque(maxlen=BUFFER_MAXLEN)

    # Open camera
    cap = _open_camera()

    print("\nStarting — press Enter to dump buffer, q + Enter to quit.\n")
    print("-" * 60)

    frame_index  = 0
    last_frame: Optional[TestFrame] = None
    pending_quit = False
    running      = True

    try:
        while running:
            loop_start = time.monotonic()

            new_frame = _run_frame(cap, gesture_det, affect_det, air_sign_det, vlm)

            if new_frame is not None:
                frame_index += 1
                _print_frame(new_frame, frame_index)

                has_vlm_signal     = not _is_no_signal(new_frame)
                has_gesture_signal = bool(
                    new_frame.snapshot.gestures
                    and new_frame.snapshot.gestures[0].gesture_class != "neutral"
                    and new_frame.snapshot.gestures[0].confidence >= 0.75
                )
                has_air_sign       = new_frame.snapshot.air_sign_char is not None
                has_any_signal     = has_vlm_signal or has_gesture_signal or has_air_sign

                if not has_any_signal:
                    print("  (no_signal — buffer unchanged)")
                elif _is_duplicate(last_frame, new_frame):
                    print("  (no change — buffer unchanged)")
                else:
                    test_buffer.append(new_frame)
                    # Direct append is GIL-atomic and safe in a single-threaded script
                    signal_buffer._buffer.append(new_frame.snapshot)
                    last_frame = new_frame

            # Keyboard input
            ch = _check_keypress()
            if ch == "q":
                pending_quit = True
                print("  [Press Enter to confirm quit]")
            elif ch in ("\r", "\n"):
                if pending_quit:
                    running = False
                else:
                    _print_buffer_state(test_buffer, signal_buffer)

            elapsed = time.monotonic() - loop_start
            sleep_s = max(0.0, CAPTURE_INTERVAL - elapsed)
            time.sleep(sleep_s)

    except KeyboardInterrupt:
        print("\n[Interrupted]")
    finally:
        cap.release()
        gesture_det.close()
        affect_det.close()
        air_sign_det.close()
        print("\nCamera released. Done.")


if __name__ == "__main__":
    main()