#!/usr/bin/env python3
"""fetch_train.py v2 — 从AutoDL实时同步代码模型训练进度

修复: 排除checkpoint保存时的"0/1"假进度，从trainer_state.json解析loss
"""
import subprocess, json, re
from datetime import datetime, timezone

DATA_FILE = '/opt/guanghulab-repo/homepage/training-status.json'
SSH_BASE = ['sshpass','-p','HkM43lFVUIsc','ssh','-o','StrictHostKeyChecking=no',
            '-o','ConnectTimeout=10','-p','23647','root@connect.westd.seetacloud.com']

def fetch_step():
    """从train_coder.log解析最后几步的step/total"""
    try:
        r = subprocess.run(SSH_BASE + ['tail','-50','/root/autodl-tmp/train_coder.log'],
            capture_output=True, text=True, timeout=30).stdout
    except:
        return 0, 11838
    
    matches = list(re.finditer(r'(\d+)/(\d+)', r))
    for m in reversed(matches):
        s, t = int(m.group(1)), int(m.group(2))
        if t == 11838 and 0 < s <= t:
            return s, t
    return 0, 11838


def fetch_loss():
    """从trainer_state.json读取最新loss"""
    try:
        cmd = 'cat /root/autodl-tmp/output/qwen25-coder-7b-sft/checkpoint-*/trainer_state.json'
        r = subprocess.run(SSH_BASE + [cmd], capture_output=True, text=True, timeout=15).stdout
        state = json.loads(r)
        for entry in reversed(state.get('log_history', [])):
            if 'loss' in entry:
                return f"{entry['loss']:.3f}"
    except:
        pass
    return '--'


def main():
    step, total = fetch_step()
    loss = fetch_loss()
    data = {
        'step': step,
        'total': total,
        'loss': loss,
        'updated': datetime.now(timezone.utc).strftime('%Y-%m-%dT%H:%M:%S.000000+00:00Z')
    }
    with open(DATA_FILE, 'w') as f:
        json.dump(data, f)
    print(f'Step {step} / {total}, Loss: {loss}')

if __name__ == '__main__':
    main()