import os
import shutil
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
SCRIPT = ROOT / "scripts" / "build_tsl_playbook.py"
SYNC_WORKFLOW = ROOT / ".gitea" / "workflows" / "sync-tsl-playbook.yml"


class BuildTslPlaybookTests(unittest.TestCase):
    def test_builds_minimal_tsl_playbook_tree(self):
        with tempfile.TemporaryDirectory() as tmp_dir:
            output = Path(tmp_dir) / "tsl-playbook"

            result = subprocess.run(
                [sys.executable, str(SCRIPT), "--output", str(output)],
                capture_output=True,
                text=True,
            )

            self.assertEqual(result.returncode, 0, msg=result.stderr)
            self.assertEqual(
                sorted(path.name for path in output.iterdir()),
                ["AGENTS.md", "docs", "skills"],
            )
            self.assertFalse((output / "playbook.toml").exists())
            self.assertFalse((output / ".agents").exists())
            self.assertFalse((output / "docs" / "index.md").exists())

            self.assertTrue((output / "docs" / "tsl" / "index.md").is_file())
            self.assertTrue(
                (output / "skills" / "tsl-api-reference" / "SKILL.md").is_file()
            )
            self.assertTrue(
                (
                    output
                    / "skills"
                    / "tsl-api-reference"
                    / "scripts"
                    / "lookup.py"
                ).is_file()
            )

            agents_text = (output / "AGENTS.md").read_text(encoding="utf-8")
            self.assertIn("# TSL Agent Instructions", agents_text)
            self.assertIn("docs/tsl/index.md", agents_text)
            self.assertIn("tsl-api-reference", agents_text)
            self.assertNotIn(".agents/index.md", agents_text)
            self.assertNotIn(".agents/tsl/index.md", agents_text)

            source_docs = count_files(ROOT / "docs" / "tsl")
            output_docs = count_files(output / "docs" / "tsl")
            self.assertEqual(output_docs, source_docs)

            source_skill = count_files(ROOT / "skills" / "tsl-api-reference")
            output_skill = count_files(output / "skills" / "tsl-api-reference")
            self.assertEqual(output_skill, source_skill)

    def test_sync_workflow_does_not_remove_entire_target_branch(self):
        text = SYNC_WORKFLOW.read_text(encoding="utf-8")

        self.assertNotRegex(text, r"git rm -rf --quiet\s+\.")
        self.assertIn("generated_paths=(AGENTS.md docs skills)", text)
        self.assertIn('git add -A "${generated_paths[@]}"', text)
        self.assertNotIn(".gitea/ci/", text)
        self.assertNotIn("https://oauth2", text)
        self.assertNotIn("oauth2:${TOKEN}", text)
        self.assertNotRegex(text, r"REPO_URL=.*(TOKEN|WORKFLOW)")
        self.assertNotIn("git remote set-url", text)
        self.assertIn("GIT_ASKPASS", text)
        self.assertIn('REPO_URL="${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git"', text)

    def test_sync_preserves_files_outside_generated_paths(self):
        if shutil.which("bash") is None:
            self.skipTest("bash is required to run sync workflow script")

        with tempfile.TemporaryDirectory() as tmp_dir:
            repo = create_source_repo(Path(tmp_dir))

            git(repo, "checkout", "--orphan", "tsl-playbook")
            git(repo, "rm", "-rf", ".")
            (repo / "README.md").write_text(
                "manual branch note\n", encoding="utf-8", newline="\n"
            )
            git(repo, "add", "README.md")
            git(repo, "commit", "-m", "manual target branch note")
            git(repo, "push", "-u", "origin", "tsl-playbook")

            git(repo, "checkout", "main")
            run_sync(repo)

            readme = run(
                ["git", "show", "HEAD:README.md"],
                cwd=repo,
                check=False,
            )
            self.assertEqual(readme.returncode, 0, msg=readme.stderr)
            self.assertEqual(readme.stdout, "manual branch note\n")

            for path in (
                "AGENTS.md",
                "docs/tsl/index.md",
                "skills/tsl-api-reference/SKILL.md",
            ):
                git(repo, "cat-file", "-e", f"HEAD:{path}")

    def test_sync_creates_new_branch_without_source_files(self):
        if shutil.which("bash") is None:
            self.skipTest("bash is required to run sync workflow script")

        with tempfile.TemporaryDirectory() as tmp_dir:
            repo = create_source_repo(Path(tmp_dir))

            run_sync(repo)

            for path in (
                "AGENTS.md",
                "docs/tsl/index.md",
                "skills/tsl-api-reference/SKILL.md",
            ):
                git(repo, "cat-file", "-e", f"HEAD:{path}")

            for path in (
                ".gitea/workflows/sync-tsl-playbook.yml",
                "scripts/build_tsl_playbook.py",
                "rulesets/tsl/index.md",
            ):
                result = run(
                    ["git", "cat-file", "-e", f"HEAD:{path}"],
                    cwd=repo,
                    check=False,
                )
                self.assertNotEqual(result.returncode, 0, msg=f"{path} leaked")


def create_source_repo(tmp: Path) -> Path:
    repo = tmp / "repo"
    remote = tmp / "remote.git"

    run(["git", "init", "--bare", str(remote)])
    run(["git", "init", str(repo)])
    git(repo, "checkout", "-b", "main")
    git(repo, "config", "user.name", "test")
    git(repo, "config", "user.email", "test@example.invalid")

    copy_required_sources(repo)
    git(repo, "add", ".")
    git(repo, "commit", "-m", "initial sources")
    git(repo, "remote", "add", "origin", "../remote.git")
    git(repo, "push", "-u", "origin", "main")
    return repo


def run_sync(repo: Path) -> None:
    env = os.environ.copy()
    env.update(
        {
            "REPO_DIR": str(repo),
            "TARGET_BRANCH": "tsl-playbook",
            "COMMIT_AUTHOR_NAME": "test",
            "COMMIT_AUTHOR_EMAIL": "test@example.invalid",
        }
    )
    with tempfile.NamedTemporaryFile(
        "w", suffix=".sh", encoding="utf-8", newline="\n", delete=False
    ) as script_file:
        script_file.write(extract_sync_workflow_script())
        script_path = script_file.name
    try:
        result = subprocess.run(
            ["bash", script_path],
            cwd=repo,
            env=env,
            capture_output=True,
            text=True,
            encoding="utf-8",
            errors="replace",
        )
    finally:
        os.unlink(script_path)
    if result.returncode != 0:
        raise AssertionError(result.stderr + result.stdout)


def copy_required_sources(repo: Path) -> None:
    (repo / ".gitea" / "workflows").mkdir(parents=True)
    shutil.copy2(
        SYNC_WORKFLOW, repo / ".gitea" / "workflows" / "sync-tsl-playbook.yml"
    )

    (repo / "scripts").mkdir()
    shutil.copy2(SCRIPT, repo / "scripts" / "build_tsl_playbook.py")

    (repo / "docs" / "tsl").mkdir(parents=True)
    (repo / "docs" / "tsl" / "index.md").write_text(
        "# TSL Index\n", encoding="utf-8", newline="\n"
    )

    skill = repo / "skills" / "tsl-api-reference"
    (skill / "scripts").mkdir(parents=True)
    (skill / "SKILL.md").write_text(
        "---\nname: tsl-api-reference\n---\n", encoding="utf-8", newline="\n"
    )
    (skill / "scripts" / "lookup.py").write_text(
        "print('lookup')\n", encoding="utf-8", newline="\n"
    )

    (repo / "rulesets" / "tsl").mkdir(parents=True)
    (repo / "rulesets" / "tsl" / "index.md").write_text(
        "# TSL Agent Instructions\n", encoding="utf-8", newline="\n"
    )


def count_files(path: Path) -> int:
    return sum(1 for item in path.rglob("*") if item.is_file())


def extract_sync_workflow_script() -> str:
    lines = SYNC_WORKFLOW.read_text(encoding="utf-8").splitlines()
    in_sync_step = False
    in_run_block = False
    script_lines: list[str] = []

    for line in lines:
        if line.startswith("      - name: 📦 Build and publish tsl-playbook"):
            in_sync_step = True
            continue
        if in_sync_step and line.startswith("      - name: "):
            break
        if in_sync_step and line == "        run: |":
            in_run_block = True
            continue
        if not in_run_block:
            continue
        if line.startswith("          "):
            script_lines.append(line[10:])
            continue
        if line.strip() == "":
            script_lines.append("")
            continue
        break

    if not script_lines:
        raise AssertionError("sync workflow run block was not found")
    return "\n".join(script_lines) + "\n"


def git(repo: Path, *args: str) -> subprocess.CompletedProcess[str]:
    return run(["git", *args], cwd=repo)


def run(
    args: list[str],
    cwd: Path | None = None,
    check: bool = True,
) -> subprocess.CompletedProcess[str]:
    result = subprocess.run(
        args,
        cwd=cwd,
        capture_output=True,
        text=True,
        encoding="utf-8",
        errors="replace",
    )
    if check and result.returncode != 0:
        raise AssertionError(
            f"command failed: {' '.join(args)}\n{result.stderr}{result.stdout}"
        )
    return result


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