import json
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from zsgdp.cli import main
from zsgdp.config import load_config
from zsgdp.gpu.batching import batch_gpu_tasks
from zsgdp.gpu.runner import dry_run_gpu_tasks, load_gpu_tasks, run_gpu_task_manifest
from zsgdp.gpu.worker import GPUWorker
from zsgdp.utils import write_jsonl


class GPURunnerTests(unittest.TestCase):
    def test_batch_gpu_tasks_groups_by_task_type_and_batch_size(self):
        tasks = [
            {"task_id": "a", "task_type": "figure_description", "priority": 1},
            {"task_id": "b", "task_type": "figure_description", "priority": 2},
            {"task_id": "c", "task_type": "table_vlm_repair", "priority": 3},
        ]

        batches = batch_gpu_tasks(tasks, max_batch_size=1)

        self.assertEqual(len(batches), 3)
        self.assertEqual(batches[0]["task_count"], 1)
        self.assertEqual({batch["task_type"] for batch in batches}, {"figure_description", "table_vlm_repair"})

    def test_worker_reports_missing_image_path(self):
        worker = GPUWorker(load_config())

        result = worker.run(
            {
                "task_id": "gt1",
                "task_type": "figure_description",
                "doc_id": "d1",
                "page_nums": [1],
                "image_path": "/tmp/does-not-exist.png",
            }
        )

        self.assertEqual(result["status"], "blocked_missing_inputs")
        self.assertIn("image_path", result["readiness"]["missing_inputs"])

    def test_run_gpu_task_manifest_writes_report(self):
        with tempfile.TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            image_path = tmp_path / "figure.png"
            image_path.write_bytes(b"fake")
            tasks_path = tmp_path / "gpu_tasks.jsonl"
            report_path = tmp_path / "report.json"
            write_jsonl(
                tasks_path,
                [
                    {
                        "task_id": "gt1",
                        "task_type": "figure_description",
                        "doc_id": "d1",
                        "page_nums": [1],
                        "image_path": str(image_path),
                        "priority": 60,
                    }
                ],
            )

            report = run_gpu_task_manifest(tmp_path, config=load_config(), output_path=report_path)

            self.assertEqual(report["task_count"], 1)
            self.assertEqual(report["ready_count"], 1)
            self.assertTrue(report_path.exists())
            self.assertEqual(json.loads(report_path.read_text(encoding="utf-8"))["batch_count"], 1)

    def test_dry_run_gpu_tasks_accepts_in_memory_tasks(self):
        with tempfile.TemporaryDirectory() as tmp:
            image_path = Path(tmp) / "figure.png"
            image_path.write_bytes(b"fake")

            report = dry_run_gpu_tasks(
                [
                    {
                        "task_id": "gt1",
                        "task_type": "figure_description",
                        "doc_id": "d1",
                        "page_nums": [1],
                        "image_path": str(image_path),
                        "priority": 60,
                    }
                ],
                config=load_config(),
            )

        self.assertEqual(report["ready_count"], 1)
        self.assertEqual(report["blocked_count"], 0)

    def test_execute_gpu_tasks_dispatches_transformers_client(self):
        with tempfile.TemporaryDirectory() as tmp:
            image_path = Path(tmp) / "figure.png"
            image_path.write_bytes(b"fake")
            task = {
                "task_id": "gt1",
                "task_type": "figure_description",
                "doc_id": "d1",
                "page_nums": [1],
                "image_path": str(image_path),
                "priority": 60,
                "backend": "transformers",
                "model_role": "vlm",
                "model_id": "local-test-model",
            }

            with patch("zsgdp.gpu.worker.TransformersClient") as client_class:
                client_class.return_value.execute_task.return_value = {"status": "executed", "text": "Figure description."}
                report = dry_run_gpu_tasks([task], config=load_config(), dry_run=False)

        self.assertFalse(report["dry_run"])
        self.assertEqual(report["executed_count"], 1)
        self.assertEqual(report["failed_count"], 0)
        self.assertEqual(report["batches"][0]["status"], "execute_complete")
        client_class.return_value.execute_task.assert_called_once()

    def test_load_gpu_tasks_accepts_file_path(self):
        with tempfile.TemporaryDirectory() as tmp:
            tasks_path = Path(tmp) / "tasks.jsonl"
            write_jsonl(tasks_path, [{"task_id": "gt1"}])

            self.assertEqual(load_gpu_tasks(tasks_path)[0]["task_id"], "gt1")

    def test_run_gpu_tasks_cli(self):
        with tempfile.TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            tasks_path = tmp_path / "gpu_tasks.jsonl"
            report_path = tmp_path / "report.json"
            write_jsonl(
                tasks_path,
                [
                    {
                        "task_id": "gt1",
                        "task_type": "figure_description",
                        "doc_id": "d1",
                        "page_nums": [1],
                        "image_path": str(tmp_path / "missing.png"),
                        "priority": 60,
                    }
                ],
            )

            code = main(["run-gpu-tasks", "--input", str(tasks_path), "--output", str(report_path)])

            self.assertEqual(code, 0)
            self.assertTrue(report_path.exists())

    def test_run_gpu_tasks_cli_execute(self):
        with tempfile.TemporaryDirectory() as tmp:
            tmp_path = Path(tmp)
            image_path = tmp_path / "figure.png"
            image_path.write_bytes(b"fake")
            tasks_path = tmp_path / "gpu_tasks.jsonl"
            report_path = tmp_path / "report.json"
            write_jsonl(
                tasks_path,
                [
                    {
                        "task_id": "gt1",
                        "task_type": "figure_description",
                        "doc_id": "d1",
                        "page_nums": [1],
                        "image_path": str(image_path),
                        "priority": 60,
                        "backend": "transformers",
                        "model_role": "vlm",
                        "model_id": "local-test-model",
                    }
                ],
            )

            with patch("zsgdp.gpu.worker.TransformersClient") as client_class:
                client_class.return_value.execute_task.return_value = {"status": "executed", "text": "done"}
                code = main(["run-gpu-tasks", "--input", str(tasks_path), "--output", str(report_path), "--execute"])

            self.assertEqual(code, 0)
            self.assertEqual(json.loads(report_path.read_text(encoding="utf-8"))["executed_count"], 1)


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