"""
Search for readable ASCII strings in the decoded text from screen.png.
"""
import sys
import re

path = r"D:\Yuzu-GCA\screen.png"

with open(path, 'rb') as f:
    raw = f.read()

# Decode as UTF-16 LE
text = raw.decode('utf-16-le')

# Find all printable ASCII sequences of length >= 4
matches = re.findall(r'[ -~]{4,}', text)
print(f"Found {len(matches)} ASCII strings of length >= 4")
print("\n=== First 60 matches ===")
for i, m in enumerate(matches[:60]):
    print(f"  [{i}] '{m}'")

# Also search for specific patterns
patterns = ['OTA', 'update', 'download', 'install', 'version', 'error', 'fail', 
            'success', 'manifest', 'SHA256', 'verify', 'check', '完成', '下载',
            '安装', '校验', '版本', '测试', '日志']
print("\n=== Pattern search ===")
for p in patterns:
    count = text.count(p)
    if count > 0:
        # Find context around first occurrence
        idx = text.find(p)
        start = max(0, idx - 30)
        end = min(len(text), idx + len(p) + 50)
        ctx = text[start:end].encode('ascii', errors='replace').decode('ascii')
        print(f"  '{p}' found {count} times. First context: ...{ctx}...")