import platform
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / "scripts" / "main_loop.py"


def run_cli(*args, cwd=None):
    return subprocess.run(
        [sys.executable, str(SCRIPT), *args],
        capture_output=True,
        text=True,
        cwd=cwd,
    )


class MainLoopCliTests(unittest.TestCase):
    def _current_env(self) -> str:
        system = platform.system().lower()
        mapping = {"windows": "windows", "linux": "linux", "darwin": "darwin"}
        if system not in mapping:
            self.skipTest(f"Unsupported environment: {system}")
        return mapping[system]

    def test_claim_seeds_progress_and_marks_first_plan_in_progress(self):
        with tempfile.TemporaryDirectory() as tmp_dir:
            root = Path(tmp_dir)
            plans_dir = root / "docs" / "plans"
            plans_dir.mkdir(parents=True)
            (plans_dir / "2026-01-01-old.md").write_text("old", encoding="utf-8")
            (plans_dir / "2026-01-02-new.md").write_text("new", encoding="utf-8")

            result = run_cli(
                "claim",
                "-plans",
                "docs/plans",
                "-progress",
                "memory-bank/progress.md",
                cwd=root,
            )

            self.assertEqual(result.returncode, 0, msg=result.stderr)
            self.assertEqual(result.stdout.strip(), "PLAN=docs/plans/2026-01-01-old.md")

            progress = root / "memory-bank" / "progress.md"
            text = progress.read_text(encoding="utf-8")
            self.assertIn("<!-- plan-status:start -->", text)
            self.assertIn("<!-- plan-status:end -->", text)
            self.assertIn("`2026-01-01-old.md` in-progress", text)
            self.assertIn("`2026-01-02-new.md` pending", text)

    def test_claim_returns_existing_in_progress_before_pending(self):
        with tempfile.TemporaryDirectory() as tmp_dir:
            root = Path(tmp_dir)
            plans_dir = root / "docs" / "plans"
            plans_dir.mkdir(parents=True)
            (plans_dir / "2026-01-01-a.md").write_text("a", encoding="utf-8")
            (plans_dir / "2026-01-02-b.md").write_text("b", encoding="utf-8")

            progress = root / "memory-bank" / "progress.md"
            progress.parent.mkdir(parents=True)
            progress.write_text(
                "\n".join(
                    [
                        "# Plan 状态",
                        "",
                        "<!-- plan-status:start -->",
                        "- [ ] `2026-01-02-b.md` pending",
                        "- [ ] `2026-01-01-a.md` in-progress",
                        "<!-- plan-status:end -->",
                        "",
                    ]
                ),
                encoding="utf-8",
            )

            result = run_cli(
                "claim",
                "-plans",
                "docs/plans",
                "-progress",
                "memory-bank/progress.md",
                cwd=root,
            )

            self.assertEqual(result.returncode, 0, msg=result.stderr)
            self.assertEqual(result.stdout.strip(), "PLAN=docs/plans/2026-01-01-a.md")

    def test_claim_resumes_env_blocked_plan_and_preserves_note(self):
        with tempfile.TemporaryDirectory() as tmp_dir:
            root = Path(tmp_dir)
            plans_dir = root / "docs" / "plans"
            plans_dir.mkdir(parents=True)
            (plans_dir / "2026-01-05-env.md").write_text("env", encoding="utf-8")

            progress = root / "memory-bank" / "progress.md"
            progress.parent.mkdir(parents=True)
            env = self._current_env()
            note = f"env:{env}:Task1,Task3"
            progress.write_text(
                "\n".join(
                    [
                        "# Plan 状态",
                        "",
                        "<!-- plan-status:start -->",
                        f"- [ ] `2026-01-05-env.md` blocked: {note}",
                        "<!-- plan-status:end -->",
                        "",
                    ]
                ),
                encoding="utf-8",
            )

            result = run_cli(
                "claim",
                "-plans",
                "docs/plans",
                "-progress",
                "memory-bank/progress.md",
                cwd=root,
            )

            self.assertEqual(result.returncode, 0, msg=result.stderr)
            self.assertEqual(
                result.stdout.strip(),
                "\n".join(
                    [
                        "PLAN=docs/plans/2026-01-05-env.md",
                        f"NOTE={note}",
                    ]
                ),
            )

            text = progress.read_text(encoding="utf-8")
            self.assertIn(f"`2026-01-05-env.md` in-progress: {note}", text)

    def test_finish_updates_line(self):
        with tempfile.TemporaryDirectory() as tmp_dir:
            root = Path(tmp_dir)
            progress = root / "memory-bank" / "progress.md"
            progress.parent.mkdir(parents=True)
            progress.write_text(
                "\n".join(
                    [
                        "# Plan 状态",
                        "",
                        "<!-- plan-status:start -->",
                        "- [ ] `2026-01-03-demo.md` in-progress",
                        "<!-- plan-status:end -->",
                        "",
                    ]
                ),
                encoding="utf-8",
            )

            result = run_cli(
                "finish",
                "-plan",
                "docs/plans/2026-01-03-demo.md",
                "-status",
                "done",
                "-progress",
                "memory-bank/progress.md",
                cwd=root,
            )

            self.assertEqual(result.returncode, 0, msg=result.stderr)
            text = progress.read_text(encoding="utf-8")
            self.assertIn("- [x] `2026-01-03-demo.md` done", text)
            self.assertEqual(text.count("2026-01-03-demo.md"), 1)


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