"""Download and load the ModernNews event-stream checkpoint."""

from __future__ import annotations

import json
import sys
from pathlib import Path

import torch
from huggingface_hub import snapshot_download


REPO_ID = "sirus/modernnews-event-stream"


def load_model(repo_id: str = REPO_ID, device: str = "cpu"):
    repo_dir = Path(
        snapshot_download(
            repo_id,
            allow_patterns=["config.json", "vocabs.json", "event_model.pt", "modernnews/**"],
        )
    )
    sys.path.insert(0, str(repo_dir))

    from modernnews.event_model import EventStreamModel

    config = json.loads((repo_dir / "config.json").read_text(encoding="utf-8"))
    vocabs = json.loads((repo_dir / "vocabs.json").read_text(encoding="utf-8"))
    model = EventStreamModel(
        num_event_types=len(vocabs["event_types"]),
        num_topics=len(vocabs["topics"]),
        num_locations=len(vocabs["locations"]),
        hidden_size=config["hidden_size"],
        tcn_depth=config["tcn_depth"],
        tcn_kernel_size=config["tcn_kernel_size"],
        dropout=config["dropout"],
    )
    state_dict = torch.load(repo_dir / config["weights_file"], map_location="cpu", weights_only=True)
    model.load_state_dict(state_dict)
    return model.to(device).eval(), vocabs, config


if __name__ == "__main__":
    loaded_model, loaded_vocabs, loaded_config = load_model()
    parameter_count = sum(parameter.numel() for parameter in loaded_model.parameters())
    print(f"Loaded {parameter_count:,} parameters")
    print({name: len(values) for name, values in loaded_vocabs.items()})
    print(f"Expected window size: {loaded_config['window_size']}")