from __future__ import annotations

import json
import os
import sys
import tempfile
import types
import unittest
from pathlib import Path
from unittest.mock import Mock, patch

from airfrans_frontier.training.hf_upload import HfArtifactUploader, resolve_resume_checkpoint


class HuggingFaceUploadTests(unittest.TestCase):
    def test_uploader_creates_repo_uploads_file_and_writes_manifest(self) -> None:
        created: list[tuple[str, str, bool]] = []
        committed: list[tuple[str, str, tuple[str, ...], str]] = []

        class FakeCommitOperationAdd:
            def __init__(self, *, path_in_repo: str, path_or_fileobj: str) -> None:
                self.path_in_repo = path_in_repo
                self.path_or_fileobj = path_or_fileobj

        class FakeApi:
            def __init__(self, token: str) -> None:
                self.token = token

            def create_repo(self, *, repo_id: str, repo_type: str, private: bool, exist_ok: bool) -> None:
                created.append((repo_id, repo_type, private))

            def create_commit(self, *, repo_id: str, repo_type: str, operations: list[FakeCommitOperationAdd], commit_message: str):
                committed.append((repo_id, repo_type, tuple(operation.path_in_repo for operation in operations), commit_message))
                return types.SimpleNamespace(commit_url="https://huggingface.co/repo/commit/abc", oid="abc")

        fake_module = types.SimpleNamespace(HfApi=FakeApi, CommitOperationAdd=FakeCommitOperationAdd)
        with tempfile.TemporaryDirectory() as tmp, patch.dict(sys.modules, {"huggingface_hub": fake_module}), patch.dict(os.environ, {"HF_TOKEN": "token"}):
            root = Path(tmp)
            (root / "checkpoint_latest.pt").write_bytes(b"checkpoint")
            uploader = HfArtifactUploader(
                enabled=True,
                run_dir=root,
                repo_id="owner/repo",
                repo_type="model",
                path_in_repo="runs/model/run-1",
                private=False,
            )

            result = uploader.upload_files(("checkpoint_latest.pt",), commit_message="upload checkpoint")

            self.assertEqual(result["uploaded"], ["runs/model/run-1/checkpoint_latest.pt"])
            self.assertEqual(created, [("owner/repo", "model", False)])
            self.assertEqual(committed, [("owner/repo", "model", ("runs/model/run-1/checkpoint_latest.pt",), "upload checkpoint")])
            manifest = json.loads((root / "hf_upload_manifest.json").read_text())
            self.assertTrue(manifest["enabled"])
            self.assertEqual(manifest["repo_id"], "owner/repo")
            self.assertIn("runs/model/run-1/checkpoint_latest.pt", manifest["uploaded_paths"])

    def test_uploader_suppresses_uploads_after_hf_retry_after_limit(self) -> None:
        class FakeRateLimitError(RuntimeError):
            def __init__(self) -> None:
                super().__init__("429 Too Many Requests: Retry after 600 seconds")
                self.response = types.SimpleNamespace(headers={"Retry-After": "600"})

        class FakeCommitOperationAdd:
            def __init__(self, *, path_in_repo: str, path_or_fileobj: str) -> None:
                self.path_in_repo = path_in_repo
                self.path_or_fileobj = path_or_fileobj

        fake_module = types.SimpleNamespace(CommitOperationAdd=FakeCommitOperationAdd)
        with tempfile.TemporaryDirectory() as tmp, patch.dict(sys.modules, {"huggingface_hub": fake_module}):
            root = Path(tmp)
            (root / "metrics.jsonl").write_text("{}\n")
            uploader = HfArtifactUploader(
                enabled=True,
                run_dir=root,
                repo_id="owner/repo",
                repo_type="model",
                path_in_repo="runs/model/run-1",
                private=False,
                max_rate_limit_sleep_seconds=0,
            )
            fake_api = types.SimpleNamespace(create_commit=Mock(side_effect=FakeRateLimitError()))
            uploader._api = fake_api

            with self.assertRaises(FakeRateLimitError):
                uploader.upload_files(("metrics.jsonl",), commit_message="first")
            suppressed = uploader.upload_files(("metrics.jsonl",), commit_message="second")

            self.assertTrue(suppressed["rate_limited"])
            self.assertEqual(fake_api.create_commit.call_count, 1)
            manifest = json.loads((root / "hf_upload_manifest.json").read_text())
            self.assertGreater(manifest["rate_limit_until"], 0)
            self.assertEqual(manifest["rate_limit_retry_after_seconds"], 600.0)
            self.assertEqual(len(manifest["suppressed_uploads"]), 2)

    def test_resolve_resume_checkpoint_downloads_hf_uri(self) -> None:
        calls: list[tuple[str, str]] = []

        def fake_download(*, repo_id: str, repo_type: str, filename: str, token: str, local_dir: str) -> str:
            calls.append((repo_id, filename))
            path = Path(local_dir) / filename
            path.parent.mkdir(parents=True, exist_ok=True)
            path.write_bytes(b"checkpoint")
            return str(path)

        fake_module = types.SimpleNamespace(hf_hub_download=fake_download)
        with patch.dict(sys.modules, {"huggingface_hub": fake_module}), patch.dict(os.environ, {"HF_TOKEN": "token"}):
            path, info = resolve_resume_checkpoint("hf://owner/repo/runs/model/checkpoint_latest.pt")

            self.assertIsNotNone(path)
            assert path is not None
            self.assertTrue(path.is_file())
            self.assertEqual(calls, [("owner/repo", "runs/model/checkpoint_latest.pt")])
            self.assertTrue(info["resume_downloaded"])
            self.assertEqual(info["resume_source"], "hf://owner/repo/runs/model/checkpoint_latest.pt")


if __name__ == "__main__":
    unittest.main()