import importlib.util
import sys
import unittest
from pathlib import Path

from _helpers import REPO_ROOT, TempDirMixin


def load_task_board_module():
    script_path = REPO_ROOT / "scripts" / "gen_task_board.py"
    spec = importlib.util.spec_from_file_location("gen_task_board", script_path)
    module = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = module
    spec.loader.exec_module(module)
    return module


class TaskBoardTests(TempDirMixin, unittest.TestCase):
    def write_task(
        self,
        tasks_dir,
        task_id,
        title,
        phase,
        deps,
        status,
        created="2026-07-08",
    ):
        deps_text = "[" + ", ".join(deps) + "]"
        path = Path(tasks_dir) / f"{task_id}.md"
        path.write_text(
            "\n".join(
                [
                    "---",
                    f"id: {task_id}",
                    f"title: {title}",
                    f"phase: {phase}",
                    f"deps: {deps_text}",
                    f"status: {status}",
                    f"created: {created}",
                    "---",
                    "",
                    "## 问题 / 背景",
                    "",
                ]
            ),
            encoding="utf-8",
        )
        return path

    def test_generate_board_from_task_frontmatter_and_skips_invalid_files(self):
        module = load_task_board_module()
        with self.make_temp_dir() as temp_dir:
            tasks_dir = Path(temp_dir) / "tasks"
            tasks_dir.mkdir()
            output_path = Path(temp_dir) / "tasks-board.md"

            self.write_task(tasks_dir, "T-550", "已完成任务", 7, [], "DONE")
            self.write_task(tasks_dir, "T-551", "可领取任务", 8, ["T-550"], "TODO")
            self.write_task(tasks_dir, "T-552", "依赖未完成任务", 8, ["T-999"], "TODO")
            self.write_task(tasks_dir, "T-553", "进行中任务", 8, [], "DOING")
            (tasks_dir / "T-554.md").write_text(
                "---\nid: T-554\ntitle: 缺字段任务\n---\n",
                encoding="utf-8",
            )

            tasks, warnings, output = module.generate_board(tasks_dir, output_path)

            self.assertEqual(["T-550", "T-551", "T-552", "T-553"], [task.id for task in tasks])
            self.assertEqual(1, len(warnings))
            self.assertIn("T-554.md", warnings[0])
            self.assertTrue(output_path.exists())
            content = output_path.read_text(encoding="utf-8")
            self.assertEqual(output, content)
            self.assertIn("请勿手改", content)
            self.assertIn("下一个可领取：T-551（可领取任务）", content)
            self.assertIn("| T-550 | 已完成任务 | - | DONE |", content)
            self.assertIn("| T-551 | 可领取任务 | T-550 | TODO |", content)
            self.assertIn("TODO 2", content)
            self.assertIn("DOING 1", content)
            self.assertNotIn("T-554", content)

        self.assert_removed(temp_dir)


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