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#!/usr/bin/env python3
"""P75(HUD 顶部条:去整宽深色带,改紧凑半透明药丸)证据分析:真实昼/夜同机位帧。

判据(读真实实跑日志 + 顶部条像素统计):
  1. 日志含 `p43-shot=p43-hud-day` 与 `p43-shot=p43-hud-night`(同机位,12:00 / 23:30)。
  2. 顶部条区域(y<barHeight=36 全宽)近黑像素(RGB 均 <=40)占比 < 10%,
     相对「整宽深色带」基线(占比 100%)下降 > 90%。
  3. 顶部条内无 >=24x24 近黑块。
  4. 文字可读:顶部条内亮像素(RGB 均 >=200)数量 > 300(标签/数值/图标仍在)。
  5. 昼/夜两帧 pixel diff > 0。
  6. 观感是否精美由 Hermes vision 侧复核,非本脚本判据。

Usage: python3 scripts/analyze-p75.py <record-dir> <out-txt>
Exit 0 pass / 1 fail / 2 usage.
"""

import re
import sys
from pathlib import Path

import numpy as np
from PIL import Image

SHOT_RE = re.compile(r"^p43-shot=(p43-hud-(?:day|night))\S* tick=(\d+) calendar=(\S+)", re.MULTILINE)
BAR_HEIGHT = 36
DARK_MAX = 40
DARK_FRAC_MAX = 0.10
BLOCK_SIDE = 24
BRIGHT_MIN = 200
BRIGHT_MIN_COUNT = 300
FRAMES = ["p43-hud-day", "p43-hud-night"]


def max_block(mask, side):
    h, w = mask.shape
    if h < side or w < side:
        return 0
    integral = np.zeros((h + 1, w + 1), dtype=np.int64)
    integral[1:, 1:] = mask.astype(np.int64).cumsum(axis=0).cumsum(axis=1)
    best = 0
    for y in range(0, h - side + 1):
        for x in range(0, w - side + 1):
            total = (
                integral[y + side, x + side]
                - integral[y, x + side]
                - integral[y + side, x]
                + integral[y, x]
            )
            best = max(best, int(total))
    return best


def main():
    if len(sys.argv) != 3:
        print(__doc__)
        return 2
    rec = Path(sys.argv[1])
    out = Path(sys.argv[2])
    log = (rec / "log.txt").read_text(encoding="utf-8", errors="replace")
    failures = []
    lines = [
        "P75(HUD 顶部条去整宽深色带 → 紧凑半透明药丸)证据分析 — 真实 Desktop xvfb 1280x720",
        "钩子:LV_P43_SHOT=1(同机位昼 12:00 / 夜 23:30)",
        "判据:顶部条 y<36 近黑占比 vs 整宽深色带基线(100%)下降 >90%,文字亮像素仍在",
        "",
    ]

    shots = {m.group(1): m.group(0) for m in SHOT_RE.finditer(log)}
    for name in FRAMES:
        if name not in shots:
            failures.append(f"log missing p43-shot={name}")
        else:
            lines.append("log: " + shots[name])
    lines.append("")

    baseline_px = 1280 * BAR_HEIGHT
    stats = {}
    for name in FRAMES:
        path = rec / f"{name}.png"
        if not path.exists():
            failures.append(f"missing frame {path.name}")
            continue
        rgb = np.asarray(Image.open(path).convert("RGB"), dtype=np.int16)
        h, w = rgb.shape[0], rgb.shape[1]
        strip = rgb[0:BAR_HEIGHT, :, :]
        dark_mask = (strip[:, :, 0] <= DARK_MAX) & (strip[:, :, 1] <= DARK_MAX) & (strip[:, :, 2] <= DARK_MAX)
        dark_px = int(dark_mask.sum())
        strip_px = strip.shape[0] * strip.shape[1]
        dark_frac = dark_px / strip_px
        drop = 1.0 - dark_frac
        block = max_block(dark_mask, BLOCK_SIDE)
        bright = int(((strip[:, :, 0] >= BRIGHT_MIN) & (strip[:, :, 1] >= BRIGHT_MIN) & (strip[:, :, 2] >= BRIGHT_MIN)).sum())
        stats[name] = {"dark_frac": dark_frac, "bright": bright}
        lines.append(
            f"{name}.png: size={w}x{h} strip_dark_px={dark_px}/{strip_px} dark_frac={dark_frac:.3f} drop_vs_full_band={drop*100:.1f}% dark_block_{BLOCK_SIDE}={block} bright_px={bright}"
        )
        if (w, h) != (1280, 720):
            failures.append(f"{path.name} size {w}x{h} != 1280x720")
        if dark_frac >= DARK_FRAC_MAX:
            failures.append(f"{name} strip dark_frac {dark_frac:.3f} >= {DARK_FRAC_MAX}")
        if drop <= 0.90:
            failures.append(f"{name} dark-area drop {drop*100:.1f}% <= 90%")
        if block >= BLOCK_SIDE * BLOCK_SIDE:
            failures.append(f"{name} has a solid {BLOCK_SIDE}x{BLOCK_SIDE} near-black block in strip")
        if bright < BRIGHT_MIN_COUNT:
            failures.append(f"{name} strip bright_px {bright} < {BRIGHT_MIN_COUNT} (text/icons may be unreadable)")
    lines.append("")

    have = [n for n in FRAMES if n in stats]
    if len(have) == 2:
        a = np.asarray(Image.open(rec / f"{have[0]}.png").convert("RGB"), dtype=np.int16)
        b = np.asarray(Image.open(rec / f"{have[1]}.png").convert("RGB"), dtype=np.int16)
        differing = int((np.abs(a - b).sum(axis=2) > 0).sum())
        lines.append(f"diff {have[0]} vs {have[1]}: differing_pixels={differing}")
        if differing == 0:
            failures.append("day and night frames are identical")

    lines.append("")
    if failures:
        lines.append("verdict=FAIL")
        for f in failures:
            lines.append("  - " + f)
    else:
        lines.append("verdict=PASS")
        lines.append(f"  baseline full-width dark band = {baseline_px} px (frac 1.000).")
        lines.append("  both strips are mostly scene/pill, no near-black block, and text/icons remain bright.")
    out.parent.mkdir(parents=True, exist_ok=True)
    out.write_text("\n".join(lines) + "\n", encoding="utf-8")
    print(f"wrote {out} verdict={'FAIL' if failures else 'PASS'}")
    return 1 if failures else 0


if __name__ == "__main__":
    sys.exit(main())