import base64
import json
from pathlib import Path

import numpy as np

from pose_tracking_exp.common.joints import BODY20_INDEX_BY_NAME
from pose_tracking_exp.common.normalization import normalize_coco_body20, normalize_rtmpose_body20
from pose_tracking_exp.detection.cvmmap_payload import (
    COCO_WHOLEBODY_KEYPOINT_COUNT,
    PROTOCOL_HEADER,
    CvmmapPosePayloadCodec,
    convert_payload_record,
    decode_pose_payload,
)
from pose_tracking_exp.schema.detection import PoseDetections
from pose_tracking_exp.tracking import load_replay_file, load_scene_file, synchronize_frames


def _encode_payload(
    *,
    frame_index: int,
    reference_size: tuple[int, int],
    boxes: np.ndarray,
    box_scores: np.ndarray,
    keypoints_xy: np.ndarray,
    keypoint_scores: np.ndarray,
    timestamp_unix_ns: int,
) -> bytes:
    return (
        PROTOCOL_HEADER
        + int(frame_index).to_bytes(4, "little")
        + np.asarray(reference_size, dtype="<u2").tobytes()
        + int(boxes.shape[0]).to_bytes(1, "little")
        + np.asarray(boxes, dtype="<u2").tobytes()
        + int(box_scores.shape[0]).to_bytes(1, "little")
        + np.asarray(box_scores, dtype=np.uint8).tobytes()
        + int(keypoints_xy.shape[0]).to_bytes(1, "little")
        + np.asarray(keypoints_xy, dtype="<u2").tobytes()
        + int(keypoint_scores.shape[0]).to_bytes(1, "little")
        + np.asarray(keypoint_scores, dtype=np.uint8).reshape(-1).tobytes()
        + int(timestamp_unix_ns).to_bytes(8, "little")
    )


def test_normalize_rtmpose_body20_derives_midpoints_and_head():
    keypoints = np.zeros((133, 2), dtype=np.float64)
    scores = np.zeros((133,), dtype=np.float64)
    keypoints[5] = [10.0, 20.0]
    keypoints[6] = [30.0, 20.0]
    keypoints[11] = [12.0, 60.0]
    keypoints[12] = [28.0, 60.0]
    keypoints[0] = [20.0, 8.0]
    scores[[0, 5, 6, 11, 12]] = 1.0

    normalized = normalize_rtmpose_body20(keypoints, scores)

    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["hip_middle"], :2], [20.0, 60.0])
    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["shoulder_middle"], :2], [20.0, 20.0])
    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["head"], :2], [20.0, 8.0])


def test_normalize_coco17_body20_derives_midpoints_and_head():
    keypoints = np.zeros((17, 2), dtype=np.float64)
    scores = np.zeros((17,), dtype=np.float64)
    keypoints[5] = [10.0, 20.0]
    keypoints[6] = [30.0, 20.0]
    keypoints[11] = [12.0, 60.0]
    keypoints[12] = [28.0, 60.0]
    keypoints[0] = [20.0, 8.0]
    scores[[0, 5, 6, 11, 12]] = 1.0

    normalized = normalize_coco_body20(keypoints, scores, keypoint_schema="coco17")

    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["hip_middle"], :2], [20.0, 60.0])
    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["shoulder_middle"], :2], [20.0, 20.0])
    np.testing.assert_allclose(normalized[BODY20_INDEX_BY_NAME["head"], :2], [20.0, 8.0])


def test_decode_payload_and_convert_record():
    keypoints_xy = np.zeros((1, 133, 2), dtype=np.uint16)
    keypoint_scores = np.zeros((1, 133), dtype=np.uint8)
    keypoints_xy[0, 5] = [100, 200]
    keypoints_xy[0, 6] = [200, 200]
    keypoints_xy[0, 11] = [110, 400]
    keypoints_xy[0, 12] = [190, 400]
    keypoints_xy[0, 0] = [150, 120]
    keypoint_scores[0, [0, 5, 6, 11, 12]] = 255

    payload = _encode_payload(
        frame_index=7,
        reference_size=(640, 480),
        boxes=np.asarray([[90, 100, 210, 420]], dtype=np.uint16),
        box_scores=np.asarray([200], dtype=np.uint8),
        keypoints_xy=keypoints_xy,
        keypoint_scores=keypoint_scores,
        timestamp_unix_ns=1234,
    )
    decoded = decode_pose_payload(payload)
    assert decoded.frame_index == 7
    assert decoded.reference_size == (640, 480)
    assert len(decoded.detections) == 1
    np.testing.assert_allclose(
        decoded.detections[0].keypoints[BODY20_INDEX_BY_NAME["hip_middle"], :2],
        [150.0, 400.0],
    )

    converted = convert_payload_record({"camera": "cam0", "payload_b64": base64.b64encode(payload).decode("ascii")})
    assert converted["camera"] == "cam0"
    assert converted["frame_index"] == 7


def test_encode_pose_payload_requires_coco_wholebody133():
    codec = CvmmapPosePayloadCodec()
    detections = PoseDetections(
        source_name="cam0",
        frame_index=1,
        source_size=(640, 480),
        boxes_xyxy=np.zeros((1, 4), dtype=np.float32),
        box_scores=np.ones((1,), dtype=np.float32),
        keypoints_xy=np.zeros((1, COCO_WHOLEBODY_KEYPOINT_COUNT, 2), dtype=np.float32),
        keypoint_scores=np.ones((1, COCO_WHOLEBODY_KEYPOINT_COUNT), dtype=np.float32),
        timestamp_unix_ns=123,
        keypoint_schema="coco_wholebody133",
    )

    payload = codec.encode(detections)
    decoded = decode_pose_payload(payload)
    assert decoded.frame_index == 1
    assert decoded.reference_size == (640, 480)


def test_load_replay_and_synchronize(tmp_path: Path):
    scene_path = tmp_path / "scene.json"
    replay_path = tmp_path / "replay.jsonl"
    scene_path.write_text(
        json.dumps(
            {
                "room_size": [6.0, 4.0, 3.0],
                "room_center": [0.0, 0.0, 1.0],
                "cameras": [
                    {
                        "name": "cam0",
                        "width": 640,
                        "height": 480,
                        "K": [[500.0, 0.0, 320.0], [0.0, 500.0, 240.0], [0.0, 0.0, 1.0]],
                        "DC": [0.0, 0.0, 0.0, 0.0, 0.0],
                        "R": [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]],
                        "T": [[0.0], [0.0], [0.0]],
                    },
                    {
                        "name": "cam1",
                        "width": 640,
                        "height": 480,
                        "K": [[500.0, 0.0, 320.0], [0.0, 500.0, 240.0], [0.0, 0.0, 1.0]],
                        "DC": [0.0, 0.0, 0.0, 0.0, 0.0],
                        "R": [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]],
                        "T": [[1.0], [0.0], [0.0]],
                    },
                ],
            }
        ),
        encoding="utf-8",
    )
    pose = np.zeros((20, 3), dtype=np.float64)
    replay_path.write_text(
        "\n".join(
            [
                json.dumps(
                    {
                        "camera": "cam0",
                        "frame_index": 0,
                        "timestamp_unix_ns": 1000,
                        "source_size": [640, 480],
                        "detections": [{"bbox": [0, 0, 1, 1], "bbox_confidence": 1.0, "keypoints": pose.tolist()}],
                    }
                ),
                json.dumps(
                    {
                        "camera": "cam1",
                        "frame_index": 0,
                        "timestamp_unix_ns": 1006,
                        "source_size": [640, 480],
                        "detections": [{"bbox": [0, 0, 1, 1], "bbox_confidence": 1.0, "keypoints": pose.tolist()}],
                    }
                ),
            ]
        )
        + "\n",
        encoding="utf-8",
    )

    scene = load_scene_file(scene_path)
    assert len(scene.cameras) == 2
    replay = load_replay_file(scene_path, replay_path)
    bundles = synchronize_frames(replay, max_skew_ns=20, min_views=2)
    assert len(bundles) == 1
    assert {frame.camera_name for frame in bundles[0].views} == {"cam0", "cam1"}