#!/usr/bin/env python3
"""Smoke test: download TIL repo, verify imports, run 100 steps, push dummy checkpoint."""
import os, sys

print("="*60)
print("SMOKE TEST: HF Job private repo access + training basics")
print("="*60)

# 1. Test snapshot_download of private Space
print("\n[1/5] Downloading TIL repo via snapshot_download...")
from huggingface_hub import snapshot_download
snapshot_download(
    repo_id="e-rong/til-26-ae",
    repo_type="space",
    local_dir="/app/til-26-ae-repo",
    allow_patterns=["til_environment/**"],
)
print("  ✓ Downloaded")

# 2. Install TIL environment
print("\n[2/5] Installing TIL environment...")
import subprocess
subprocess.run(["pip", "install", "-e", "."], cwd="/app/til-26-ae-repo/til-26-ae", check=True)
print("  ✓ Installed")

# 3. Verify imports
print("\n[3/5] Verifying imports...")
sys.path.insert(0, "/app/til-26-ae-repo/til-26-ae")
from til_environment.bomberman_env import Bomberman
from til_environment.config import default_config
from pettingzoo.utils.conversions import aec_to_parallel
print("  ✓ Imports OK")

# 4. Run 100 steps of dummy training
print("\n[4/5] Running 100 training steps...")
from sb3_contrib import MaskablePPO
from sb3_contrib.common.wrappers import ActionMasker
from stable_baselines3.common.monitor import Monitor
import gymnasium
from gymnasium.spaces import Box, Discrete
import numpy as np

class QuickEnv(gymnasium.Env):
    def __init__(self):
        super().__init__()
        cfg = default_config()
        cfg.env.render_mode = None
        raw = Bomberman(cfg)
        self._parallel_env = aec_to_parallel(raw)
        self.agent_id = "agent_0"
        self._episode_count = 0
        self.action_space = Discrete(6)
        vl = int(cfg.dynamics.vision.behind) + int(cfg.dynamics.vision.ahead) + 1
        vw = int(cfg.dynamics.vision.left) + int(cfg.dynamics.vision.right) + 1
        av = vl * vw * 25
        br = int(cfg.entities.base.vision_radius)
        bs = 2 * br + 1
        bv = bs * bs * 25
        self._obs_size = av + bv + 11
        self.observation_space = Box(low=-np.inf, high=np.inf, shape=(self._obs_size,), dtype=np.float32)
        self._last_action_mask = None
        self._last_obs_dict = None
    def reset(self, seed=None, options=None):
        self._episode_count += 1
        obs_dict, _ = self._parallel_env.reset(seed=self._episode_count, options=options)
        self._last_obs_dict = obs_dict
        self._last_action_mask = obs_dict[self.agent_id]["action_mask"].astype(bool)
        return self._flatten(obs_dict[self.agent_id]), {}
    def step(self, action):
        actions = {self.agent_id: action}
        for aid, obs in self._last_obs_dict.items():
            if aid != self.agent_id:
                valid = np.where(obs["action_mask"] == 1)[0]
                actions[aid] = int(np.random.choice(valid)) if len(valid) > 0 else 0
        obs_dict, rewards, terminations, truncations, infos = self._parallel_env.step(actions)
        self._last_obs_dict = obs_dict
        if self.agent_id not in obs_dict:
            return np.zeros(self._obs_size, dtype=np.float32), 0.0, True, False, {}
        self._last_action_mask = obs_dict[self.agent_id]["action_mask"].astype(bool)
        obs = self._flatten(obs_dict[self.agent_id])
        r = float(rewards.get(self.agent_id, 0.0))
        done = terminations.get(self.agent_id, False) or truncations.get(self.agent_id, False)
        return obs, r, done, False, infos.get(self.agent_id, {})
    def action_masks(self):
        return self._last_action_mask
    def _flatten(self, od):
        return np.concatenate([
            od["agent_viewcone"].flatten(), od["base_viewcone"].flatten(),
            np.array([od["direction"]], dtype=np.float32),
            od["location"].flatten().astype(np.float32),
            od["base_location"].flatten().astype(np.float32),
            od["health"].flatten().astype(np.float32),
            np.array([od["frozen_ticks"]], dtype=np.float32),
            od["base_health"].flatten().astype(np.float32),
            od["team_resources"].flatten().astype(np.float32),
            np.array([od["team_bombs"]], dtype=np.float32),
            np.array([od["step"]], dtype=np.float32),
        ], dtype=np.float32)

env = ActionMasker(QuickEnv(), lambda e: e.action_masks())
env = Monitor(env)

model = MaskablePPO(
    "MlpPolicy", env,
    learning_rate=3e-4, n_steps=128, batch_size=32, n_epochs=2,
    gamma=0.99, clip_range=0.2, ent_coef=0.01,
    verbose=0, device="cuda",
)
model.learn(total_timesteps=100, progress_bar=False)
print("  ✓ 100 steps completed")

# 5. Push dummy checkpoint to Hub
print("\n[5/5] Pushing dummy checkpoint to Hub...")
from huggingface_hub import HfApi
model.save("/app/smoke_test_ckpt.zip")
HfApi().upload_file(
    path_or_fileobj="/app/smoke_test_ckpt.zip",
    path_in_repo="smoke_test_ckpt.zip",
    repo_id="E-Rong/til-26-ae-agent",
    repo_type="model",
)
print("  ✓ Pushed to Hub")

print("\n" + "="*60)
print("SMOKE TEST PASSED — Ready for full training job")
print("="*60)