#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Visualize PE-Video samples with:
- colored instance masks (per object id)
- centroid label box (object name)
- relationship text panel appended under the video

Assumptions:
- training JSON entries look like:
    {
      "video": ".../xxx.mp4",
      "mask_json": "..._rle.json",
      "obj_list": [0,1,...],
      "has_relationships": True/False,
      "conversations": [
          {"from":"human", ...},
          {"from":"gpt", "value": "<json string of objects/relationships>"}
      ],
      "mode": "mode_6"
    }

- mask_json file format:
    masks = List[List[rle]]
    masks[frame_idx][object_idx] = {"size":[H,W], "counts": ...}

- relationships format inside gpt JSON:
    "relationships": [
        [sub_id, "rel", obj_id, [[t0,t1],[t2,t3], ...]],
        ...
    ]
  where each interval [t0,t1] is inclusive frame indices (we treat as inclusive).
"""

import os
import re
import json
import math
import random
import argparse
from typing import Any, Dict, List, Tuple, Optional

import cv2
import numpy as np

import shutil


try:
    from pycocotools import mask as mask_utils
except Exception as e:
    raise RuntimeError(
        "pycocotools is required. Install via: pip install pycocotools"
    ) from e


# -----------------------------
# Utilities
# -----------------------------
def draw_top_left_hud(frame_bgr: np.ndarray, text: str):
    x, y = 10, 10
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 0.5
    thickness = 2
    pad = 8

    (tw, th), baseline = cv2.getTextSize(text, font, font_scale, thickness)
    box_w = tw + pad * 2
    box_h = th + baseline + pad * 2

    overlay = frame_bgr.copy()
    cv2.rectangle(overlay, (x, y), (x + box_w, y + box_h), (0, 0, 0), thickness=-1)
    cv2.addWeighted(overlay, 0.45, frame_bgr, 0.55, 0, frame_bgr)

    cv2.putText(frame_bgr, text, (x + pad, y + pad + th),
                font, font_scale, (255, 255, 255), thickness, cv2.LINE_AA)
def draw_id_at_centroid(frame_bgr: np.ndarray, obj_id: int, center_xy: Tuple[int,int], color_bgr: Tuple[int,int,int]):
    cx, cy = center_xy
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 0.5
    thickness = 1
    text = str(obj_id)

    (tw, th), baseline = cv2.getTextSize(text, font, font_scale, thickness)
    pad = 4

    x1 = cx - tw // 2 - pad
    y1 = cy - th // 2 - pad
    x2 = cx + tw // 2 + pad
    y2 = cy + th // 2 + pad

    H, W = frame_bgr.shape[:2]
    x1 = max(0, min(W - 1, x1))
    x2 = max(0, min(W - 1, x2))
    y1 = max(0, min(H - 1, y1))
    y2 = max(0, min(H - 1, y2))

    cv2.rectangle(frame_bgr, (x1, y1), (x2, y2), color_bgr, thickness=-1)
    txt_color = (0, 0, 0) if (sum(color_bgr) > 380) else (255, 255, 255)
    cv2.putText(frame_bgr, text, (x1 + pad, y2 - pad),
                font, font_scale, txt_color, thickness, cv2.LINE_AA)
def _wrap_text_to_width(text: str, font, font_scale: float, thickness: int, max_w: int) -> List[str]:
    if max_w <= 0:
        return [""]
    text = str(text)

    (tw, _), _b = cv2.getTextSize(text, font, font_scale, thickness)
    if tw <= max_w:
        return [text]

    words = text.split(" ")
    lines: List[str] = []
    cur = ""

    def fits(s: str) -> bool:
        (w, _), _b2 = cv2.getTextSize(s, font, font_scale, thickness)
        return w <= max_w

    for w in words:
        cand = w if cur == "" else (cur + " " + w)
        if fits(cand):
            cur = cand
        else:
            if cur:
                lines.append(cur)
                cur = ""
            if not fits(w):
                chunk = ""
                for ch in w:
                    cand2 = chunk + ch
                    if fits(cand2):
                        chunk = cand2
                    else:
                        if chunk:
                            lines.append(chunk)
                        chunk = ch
                if chunk:
                    cur = chunk
            else:
                cur = w
    if cur:
        lines.append(cur)
    return lines if lines else [""]


def render_object_list_panel_two_cols(
    width: int,
    panel_h: int,
    lines: List[str],
    font_scale: float = 0.5,
    thickness: int = 1,
    col_gap: int = 18,
    margin_x: int = 12,
    top_y: int = 24,
    line_h: int = 16,
) -> np.ndarray:
    """
    Two-column panel for object list lines like: "3: hand"
    Supports wrap inside each column.
    """
    panel = np.zeros((panel_h, width, 3), dtype=np.uint8)
    font = cv2.FONT_HERSHEY_SIMPLEX

    col_w = (width - 2 * margin_x - col_gap) // 2
    x1 = margin_x
    x2 = margin_x + col_w + col_gap

    pairs = [(lines[i], lines[i+1] if i+1 < len(lines) else "") for i in range(0, len(lines), 2)]

    y = top_y
    used = 0
    for left_text, right_text in pairs:
        left_wrapped = _wrap_text_to_width(left_text, font, font_scale, thickness, col_w) if left_text else []
        right_wrapped = _wrap_text_to_width(right_text, font, font_scale, thickness, col_w) if right_text else []
        row_lines = max(len(left_wrapped), len(right_wrapped), 1)
        row_h = row_lines * line_h

        if y + row_h > panel_h - 8:
            break

        yy = y
        for t in left_wrapped:
            cv2.putText(panel, t, (x1, yy), font, font_scale, (255, 255, 255), thickness, cv2.LINE_AA)
            yy += line_h

        yy = y
        for t in right_wrapped:
            cv2.putText(panel, t, (x2, yy), font, font_scale, (255, 255, 255), thickness, cv2.LINE_AA)
            yy += line_h

        y += row_h
        used += 2

    remaining = max(0, len(lines) - used)
    if remaining > 0:
        hint = f"... (+{remaining} more)"
        cv2.putText(panel, hint, (margin_x, panel_h - 10), font, font_scale, (200, 200, 200), thickness, cv2.LINE_AA)

    return panel

def safe_makedirs(p: str):
    os.makedirs(p, exist_ok=True)

def stable_color_for_id(obj_id: int) -> Tuple[int, int, int]:
    """
    Deterministic distinct-ish BGR color per object id.
    Uses HSV wheel -> BGR.
    """
    # golden ratio steps to spread hues
    hue = (obj_id * 0.61803398875) % 1.0
    h = int(hue * 179)            # OpenCV hue range [0,179]
    s = 200
    v = 255
    hsv = np.uint8([[[h, s, v]]])
    bgr = cv2.cvtColor(hsv, cv2.COLOR_HSV2BGR)[0, 0]
    return int(bgr[0]), int(bgr[1]), int(bgr[2])

def parse_gpt_json_from_conversations(convs: List[Dict[str, Any]]) -> Dict[str, Any]:
    """
    Extract and parse the 'gpt' message JSON (stored as a string in 'value').
    We make it robust to leading/trailing text by searching for the first {...} block.
    """
    gpt_msgs = [c for c in convs if c.get("from") == "gpt"]
    if not gpt_msgs:
        return {}

    raw = gpt_msgs[-1].get("value", "")
    if not raw:
        return {}

    # If it's already valid JSON, parse directly.
    try:
        return json.loads(raw)
    except Exception:
        pass

    # Otherwise, try to find the first JSON object substring.
    m = re.search(r"\{.*\}", raw, flags=re.DOTALL)
    if not m:
        return {}

    try:
        return json.loads(m.group(0))
    except Exception:
        return {}

def decode_rle_to_mask(rle: Dict[str, Any]) -> np.ndarray:
    """
    Robust RLE decode:
    - If rle['counts'] is list (uncompressed), use frPyObjects then decode.
    - If it's already compressed (bytes/str), decode directly.
    Returns uint8 mask of shape (H, W) with values 0/1.
    """
    if rle is None:
        return None

    if "size" not in rle or "counts" not in rle:
        return None

    h, w = rle["size"]
    counts = rle["counts"]

    try:
        if isinstance(counts, list):
            # uncompressed RLE -> convert using frPyObjects
            rle_obj = mask_utils.frPyObjects(rle, h, w)
            m = mask_utils.decode(rle_obj)
        else:
            # compressed (string/bytes)
            m = mask_utils.decode(rle)
    except Exception:
        # last attempt: sometimes need list-wrapping
        try:
            m = mask_utils.decode([rle])[:, :, 0]
        except Exception:
            return None

    # m can be (H,W) or (H,W,1)
    if m.ndim == 3:
        m = m[:, :, 0]
    m = (m > 0).astype(np.uint8)
    return m

def mask_centroid(mask01: np.ndarray) -> Optional[Tuple[int, int]]:
    """
    Compute centroid of binary mask (0/1). Returns (cx, cy) or None if empty.
    """
    if mask01 is None:
        return None
    ys, xs = np.where(mask01 > 0)
    if len(xs) == 0:
        return None
    cx = int(xs.mean())
    cy = int(ys.mean())
    return cx, cy

def overlay_mask(frame_bgr: np.ndarray, mask01: np.ndarray, color_bgr: Tuple[int,int,int], alpha: float) -> np.ndarray:
    """
    Alpha-blend colored mask onto frame.
    """
    if mask01 is None:
        return frame_bgr
    if mask01.sum() == 0:
        return frame_bgr

    out = frame_bgr.copy()
    color = np.array(color_bgr, dtype=np.float32).reshape(1, 1, 3)

    m = mask01.astype(bool)
    out_f = out.astype(np.float32)
    out_f[m] = out_f[m] * (1.0 - alpha) + color * alpha
    out = np.clip(out_f, 0, 255).astype(np.uint8)
    return out

def draw_label_box(frame_bgr: np.ndarray, text: str, center_xy: Tuple[int,int], color_bgr: Tuple[int,int,int]):
    """
    Draw filled rectangle with text centered at center_xy.
    """
    cx, cy = center_xy
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 0.5
    thickness = 1

    (tw, th), baseline = cv2.getTextSize(text, font, font_scale, thickness)
    pad = 6

    x1 = int(cx - tw / 2) - pad
    y1 = int(cy - th / 2) - pad
    x2 = int(cx + tw / 2) + pad
    y2 = int(cy + th / 2) + pad

    # clamp
    h, w = frame_bgr.shape[:2]
    x1 = max(0, min(w - 1, x1))
    x2 = max(0, min(w - 1, x2))
    y1 = max(0, min(h - 1, y1))
    y2 = max(0, min(h - 1, y2))

    cv2.rectangle(frame_bgr, (x1, y1), (x2, y2), color_bgr, thickness=-1)
    # choose contrasting text color
    txt_color = (0, 0, 0) if (color_bgr[0] + color_bgr[1] + color_bgr[2]) > 380 else (255, 255, 255)
    cv2.putText(frame_bgr, text, (x1 + pad, y2 - pad),
                font, font_scale, txt_color, thickness, cv2.LINE_AA)

def relationship_active(rel_item: List[Any], frame_idx: int, fps: float) -> bool:
    """
    rel_item = [sub_id, rel_str, obj_id, intervals]
    intervals = [[t0,t1], ...]  where t0/t1 are seconds (float or int)
    We treat intervals inclusive on ends in time.
    """
    if len(rel_item) < 4:
        return False
    intervals = rel_item[3]
    if not isinstance(intervals, list) or fps <= 1e-6:
        return False

    t = frame_idx / fps  # current time in seconds
    for itv in intervals:
        if not (isinstance(itv, (list, tuple))) or len(itv) < 2:
            continue
        t0 = float(itv[0])
        t1 = float(itv[1])
        if t0 <= t <= t1:
            return True
    return False
def render_relationship_panel(
    width: int,
    panel_h: int,
    lines: List[str],
    font_scale: float = 0.5
) -> np.ndarray:
    """
    Create a black panel and draw relationship lines.
    """
    panel = np.zeros((panel_h, width, 3), dtype=np.uint8)
    font = cv2.FONT_HERSHEY_SIMPLEX
    thickness = 1
    y = 28
    for line in lines[: max(1, panel_h // 22) ]:
        cv2.putText(panel, line, (12, y), font, font_scale, (255, 255, 255), thickness, cv2.LINE_AA)
        y += 22
        if y > panel_h - 10:
            break
    return panel


# -----------------------------
# Core pipeline
# -----------------------------

def visualize_one(
    item: Dict[str, Any],
    out_path: str,
    alpha: float = 0.3,
    panel_h: int = 600,
    max_rels: int = 100,
    max_frames: Optional[int] = None,
    verbose: bool = True,
):
    video_path = item["video"]
    mask_path = item["mask_json"]
    obj_list = item.get("obj_list", None)

    g = parse_gpt_json_from_conversations(item.get("conversations", []))
    objects = g.get("objects", [])
    rels = g.get("relationships", [])

    # object id -> name (best effort)
    id2name: Dict[int, str] = {}
    for i, obj in enumerate(objects):
        if isinstance(obj, dict):
            # expected {"object_0":"hand", "attributes":[...]}
            # find key starting with object_
            name = None
            for k, v in obj.items():
                if isinstance(k, str) and k.startswith("object_"):
                    name = str(v)
                    # parse idx from key
                    try:
                        idx = int(k.split("_")[1])
                        id2name[idx] = name
                    except Exception:
                        pass
            # fallback: if it’s ordered list and missing explicit id
            if name is not None and i not in id2name:
                id2name[i] = name

    # load masks (2D list)
    with open(mask_path, "r") as f:
        masks_2d = json.load(f)

    cap = cv2.VideoCapture(video_path)
    if not cap.isOpened():
        raise RuntimeError(f"Failed to open video: {video_path}")

    fps = cap.get(cv2.CAP_PROP_FPS)
    if not fps or math.isnan(fps) or fps <= 1e-3:
        fps = 30.0

    w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

    # output writer with extra panel
    fourcc = cv2.VideoWriter_fourcc(*"mp4v")
    writer = cv2.VideoWriter(out_path, fourcc, fps, (w, h + panel_h))
    if not writer.isOpened():
        raise RuntimeError(f"Failed to open writer: {out_path}")

    n_masks_frames = len(masks_2d)
    frame_idx = 0

    # decide which object ids to visualize
    if obj_list is None:
        # fallback to all objects present in gpt JSON
        obj_ids = sorted(id2name.keys())
    else:
        obj_ids = list(obj_list)

    if verbose:
        print(f"[viz] video={os.path.basename(video_path)} frames(video?) ~, masks_frames={n_masks_frames} obj_ids={obj_ids} rels={len(rels)} -> {out_path}")

    total_objs = len(obj_ids)
    obj_lines = []
    for oid in sorted(obj_ids):
        name = id2name.get(oid, f"obj_{oid}")
        obj_lines.append(f"{oid}: {name}")

    while True:
        ok, frame = cap.read()
        if not ok:
            break
        if frame_idx >= n_masks_frames:
            break
        if max_frames is not None and frame_idx >= max_frames:
            break

        draw_top_left_hud(frame, f"Os: {total_objs}")

        for obj_id in obj_ids:
            if obj_id >= len(masks_2d[frame_idx]):
                continue
            rle = masks_2d[frame_idx][obj_id]
            mask01 = decode_rle_to_mask(rle)
            if mask01 is None or mask01.sum() == 0:
                continue

            color = stable_color_for_id(obj_id)
            frame = overlay_mask(frame, mask01, color, alpha=alpha)

            cxy = mask_centroid(mask01)
            if cxy is not None:
                draw_id_at_centroid(frame, obj_id, cxy, color)

        panel = render_object_list_panel_two_cols(
            w, panel_h, obj_lines,
            font_scale=0.5,
            line_h=16
        )

        out_frame = np.vstack([frame, panel])
        writer.write(out_frame)

        frame_idx += 1

    cap.release()
    writer.release()






def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--data_json", type=str, required=True,
                    help="Path to pe_with_relationships.json (800k items).")
    ap.add_argument("--out_dir", type=str, required=True,
                    help="Output directory for visualization videos.")
    ap.add_argument("--num_samples", type=int, default=100)
    ap.add_argument("--seed", type=int, default=42)
    ap.add_argument("--alpha", type=float, default=0.45)
    ap.add_argument("--panel_h", type=int, default=700)
    ap.add_argument("--max_rels", type=int, default=100)
    ap.add_argument("--max_frames", type=int, default=None,
                    help="Optional cap on frames per video (debug speed).")
    args = ap.parse_args()

    safe_makedirs(args.out_dir)
    
    raw_dir = args.out_dir + "_raw"
    safe_makedirs(raw_dir)


    with open(args.data_json, "r") as f:
        data = json.load(f)

    n = len(data)
    if n == 0:
        raise RuntimeError("Empty dataset JSON.")

    k = min(args.num_samples, n)
    rng = random.Random(args.seed)
    idxs = rng.sample(range(n), k)

    # dump sampled metadata (so you can reproduce)
    sampled_items = [data[i] for i in idxs]
    with open(os.path.join(args.out_dir, "sampled_items.json"), "w") as f:
        json.dump(sampled_items, f, indent=2)

    for j, i in enumerate(idxs):
        item = data[i]
        video_path = item["video"]
        base = os.path.splitext(os.path.basename(video_path))[0]
        # ===== 1. copy raw video =====
        raw_out_path = os.path.join(raw_dir, f"{j:03d}_{base}.mp4")
        if not os.path.exists(raw_out_path):
            try:
                shutil.copy2(video_path, raw_out_path)
            except Exception as e:
                print(f"[warn] failed to copy raw video: {video_path} -> {raw_out_path}: {e}")


        out_path = os.path.join(args.out_dir, f"{j:03d}_{base}_viz.mp4")
        try:
            visualize_one(
                item=item,
                out_path=out_path,
                alpha=args.alpha,
                panel_h=args.panel_h,
                max_rels=args.max_rels,
                max_frames=args.max_frames,
                verbose=True,
            )
        except Exception as e:
            # keep going; log failures
            err_path = os.path.join(args.out_dir, "errors.txt")
            with open(err_path, "a") as ef:
                ef.write(f"[ERROR] idx={i} video={video_path}\n{repr(e)}\n\n")
            print(f"[error] idx={i} video={video_path}: {e}")

    print(f"[done] wrote {k} videos into: {args.out_dir}")


if __name__ == "__main__":
    main()