"""Unit tests for devx.ci.doc_coverage."""

from pathlib import Path

import pytest
from click.testing import CliRunner

from devx.ci.doc_coverage import (
    check_command_documented,
    check_module_documented,
    extract_cli_commands,
    main,
)


class TestExtractCliCommands:
    def test_extracts_commands(self) -> None:
        commands = extract_cli_commands()
        # devx CLI has commands under ci, tools, and molecule groups
        assert "auto-merge" in commands
        assert "release" in commands
        assert "publish" in commands
        assert "setup" in commands
        assert "install-tools" in commands

    def test_returns_list(self) -> None:
        commands = extract_cli_commands()
        assert isinstance(commands, list)
        assert len(commands) > 0

    def test_no_cli_file(self, monkeypatch: pytest.MonkeyPatch) -> None:
        """Returns empty list when CLI file doesn't exist."""
        from devx.ci import doc_coverage

        monkeypatch.setattr(doc_coverage, "CLI_FILE", Path("/nonexistent/cli.py"))
        commands = extract_cli_commands()
        assert commands == []

    def test_def_fallback_no_explicit_name(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When a command decorator has no explicit name, falls back to the def name."""
        from devx.ci import doc_coverage

        fake_cli = tmp_path / "cli.py"
        fake_cli.write_text("@click.group()\ndef cli():\n    pass\n@cli.command()\ndef my_command():\n    pass\n")
        monkeypatch.setattr(doc_coverage, "CLI_FILE", fake_cli)
        commands = extract_cli_commands()
        assert "my_command" in commands

    def test_command_decorator_no_def_fallback(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When a command decorator has no name and no following def, it is skipped."""
        from devx.ci import doc_coverage

        fake_cli = tmp_path / "cli.py"
        # The last @cli.command() has no explicit name and no def statement after it
        fake_cli.write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command()\ndef real_cmd():\n    pass\n@cli.command()\npass\n"
        )
        monkeypatch.setattr(doc_coverage, "CLI_FILE", fake_cli)
        commands = extract_cli_commands()
        # real_cmd should be found via def fallback; the bare @cli.command() is skipped
        assert "real_cmd" in commands
        assert "pass" not in commands


class TestCheckCommandDocumented:
    def test_finds_command_in_heading(self) -> None:
        content = "## auto-merge\n\nAuto-merge PR."
        assert check_command_documented("auto-merge", content) is True

    def test_finds_command_in_code_block(self) -> None:
        content = "```bash\ndevx ci release --dry-run\n```"
        assert check_command_documented("release", content) is True

    def test_finds_command_with_devx_prefix(self) -> None:
        content = "Use `devx tools setup` to install."
        assert check_command_documented("setup", content) is True

    def test_missing_command(self) -> None:
        content = "## Other stuff\n\nNo commands here."
        assert check_command_documented("release", content) is False


class TestCheckModuleDocumented:
    def test_finds_module(self) -> None:
        content = "The cli.py module handles..."
        assert check_module_documented("cli.py", content) is True

    def test_missing_module(self) -> None:
        content = "No modules mentioned."
        assert check_module_documented("cli.py", content) is False


class TestMain:
    def test_all_present(self, tmp_path: Path) -> None:
        """When all docs exist and cover all commands/modules, exit 0."""
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        # Get actual commands from the CLI
        commands = extract_cli_commands()
        # Write cli-commands.md with all commands
        cli_content = "\n".join(f"## {cmd}" for cmd in commands)
        (docs / "user" / "cli-commands.md").write_text(cli_content)
        # Write architecture.md with all modules
        from devx.ci.doc_coverage import REQUIRED_MODULES, REQUIRED_SCRIPTS

        (docs / "tech" / "architecture.md").write_text(" ".join(REQUIRED_MODULES))
        # Write ci-cd-workflow.md with all scripts
        (docs / "tech" / "ci-cd-workflow.md").write_text(" ".join(REQUIRED_SCRIPTS))
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs)])
        assert result.exit_code == 0
        assert "100%" in result.output

    def test_missing_docs_fail(self, tmp_path: Path) -> None:
        """When docs are missing and --fail-on-missing is set, exit 1."""
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        (docs / "user" / "cli-commands.md").write_text("No commands here.")
        (docs / "tech" / "architecture.md").write_text("No modules here.")
        (docs / "tech" / "ci-cd-workflow.md").write_text("No scripts here.")
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs), "--fail-on-missing"])
        assert result.exit_code == 1

    def test_missing_docs_warn_only(self, tmp_path: Path) -> None:
        """Without --fail-on-missing, missing docs only warn (exit 0)."""
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        (docs / "user" / "cli-commands.md").write_text("No commands here.")
        (docs / "tech" / "architecture.md").write_text("No modules here.")
        (docs / "tech" / "ci-cd-workflow.md").write_text("No scripts here.")
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs)])
        assert result.exit_code == 0
        assert "MISSING" in result.output