"""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,
)

# Path to devx's own source directory (for testing)
DEVX_SRC_DIR = Path(__file__).resolve().parent.parent.parent / "src" / "devx"


class TestExtractCliCommands:
    def test_extracts_commands(self) -> None:
        commands = extract_cli_commands(DEVX_SRC_DIR)
        # 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(DEVX_SRC_DIR)
        assert isinstance(commands, list)
        assert len(commands) > 0

    def test_no_cli_file(self, tmp_path: Path) -> None:
        """Returns empty list when CLI file doesn't exist."""
        commands = extract_cli_commands(tmp_path)
        assert commands == []

    def test_def_fallback_no_explicit_name(self, tmp_path: Path) -> None:
        """When a command decorator has no explicit name, falls back to the def name."""
        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")
        commands = extract_cli_commands(tmp_path)
        assert "my_command" in commands

    def test_command_decorator_no_def_fallback(self, tmp_path: Path) -> None:
        """When a command decorator has no name and no following def, it is skipped."""
        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"
        )
        commands = extract_cli_commands(tmp_path)
        # real_cmd should be found via def fallback; the bare @cli.command() is skipped
        assert "real_cmd" in commands
        assert "pass" not in commands

    def test_command_with_explicit_name_param(self, tmp_path: Path) -> None:
        """When a command uses name="explicit-name", that name is extracted."""
        fake_cli = tmp_path / "cli.py"
        fake_cli.write_text(
            '@click.group()\ndef cli():\n    pass\n@cli.command(name="my-command")\ndef my_command():\n    pass\n'
        )
        commands = extract_cli_commands(tmp_path)
        assert "my-command" in commands
        assert "my_command" not in commands

    def test_command_with_help_kwarg_uses_def_name(self, tmp_path: Path) -> None:
        """When a command uses help= kwarg but no name=, falls back to def name."""
        fake_cli = tmp_path / "cli.py"
        fake_cli.write_text(
            "@click.group()\ndef cli():\n    pass\n"
            '@cli.command(help="Do something useful")\ndef do_something():\n    pass\n'
        )
        commands = extract_cli_commands(tmp_path)
        assert "do_something" in commands
        assert "Do something useful" not in commands

    def test_command_with_help_translation_uses_def_name(self, tmp_path: Path) -> None:
        """When a command uses help=_() translation, falls back to def name."""
        fake_cli = tmp_path / "cli.py"
        fake_cli.write_text(
            "@click.group()\ndef cli():\n    pass\n"
            '@cli.command(help=_("Install and configure things"))\ndef install():\n    pass\n'
        )
        commands = extract_cli_commands(tmp_path)
        assert "install" in commands
        assert "Install and configure things" 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)
        src = tmp_path / "src" / "devx"
        src.mkdir(parents=True)
        (src / "ci").mkdir()
        (src / "__init__.py").write_text("")
        (src / "ci" / "__init__.py").write_text("")
        # Create a fake cli.py with some commands
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n"
            "@cli.command('release')\ndef release():\n    pass\n"
            "@cli.command('setup')\ndef setup():\n    pass\n"
        )
        # Create a fake module and CI script
        (src / "config.py").write_text("# config module")
        (src / "ci" / "auto_merge.py").write_text("# auto_merge script")
        # Write cli-commands.md with all commands
        cli_content = "## release\n\n## setup\n"
        (docs / "user" / "cli-commands.md").write_text(cli_content)
        # Write architecture.md with all modules
        (docs / "tech" / "architecture.md").write_text("config.py")
        # Write ci-cd-workflow.md with all scripts
        (docs / "tech" / "ci-cd-workflow.md").write_text("auto_merge.py")
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs), "--source-dir", str(src)])
        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)
        src = tmp_path / "src" / "devx"
        src.mkdir(parents=True)
        (src / "ci").mkdir()
        (src / "__init__.py").write_text("")
        (src / "ci" / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (src / "ci" / "auto_merge.py").write_text("# auto_merge")
        (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), "--source-dir", str(src), "--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)
        src = tmp_path / "src" / "devx"
        src.mkdir(parents=True)
        (src / "ci").mkdir()
        (src / "__init__.py").write_text("")
        (src / "ci" / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (src / "ci" / "auto_merge.py").write_text("# auto_merge")
        (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), "--source-dir", str(src)])
        assert result.exit_code == 0
        assert "MISSING" in result.output

    def test_auto_detect_scripts_dir(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When src/ doesn't exist but scripts/ does, auto-detect it."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        scripts = tmp_path / "scripts"
        scripts.mkdir()
        (scripts / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (scripts / "config.py").write_text("# config")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("config.py")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs)])
        assert result.exit_code == 0

    def test_no_source_dir_falls_back_to_required(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When no source dir exists, falls back to REQUIRED_MODULES/SCRIPTS."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        (docs / "user" / "cli-commands.md").write_text("")
        from devx.ci.doc_coverage import REQUIRED_MODULES, REQUIRED_SCRIPTS

        (docs / "tech" / "architecture.md").write_text(" ".join(REQUIRED_MODULES))
        (docs / "tech" / "ci-cd-workflow.md").write_text(" ".join(REQUIRED_SCRIPTS))
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs)])
        # No source dir found, so no CLI commands, but modules/scripts from REQUIRED lists
        assert result.exit_code == 0

    def test_ci_scripts_dir_empty_skips_ci_checks(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When --ci-scripts-dir is empty string, CI script checks are skipped."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "devx"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("config.py")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs), "--source-dir", str(src), "--ci-scripts-dir", ""])
        assert result.exit_code == 0
        assert "100%" in result.output
        # Should not mention any CI scripts
        assert "MISSING" not in result.output or "CI script" not in result.output

    def test_ci_scripts_dir_explicit_path(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When --ci-scripts-dir points to a directory, scripts are detected from there."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "myapp"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        ci_dir = tmp_path / "ci"
        ci_dir.mkdir()
        (ci_dir / "my_script.py").write_text("# my script")
        (ci_dir / "__init__.py").write_text("")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("")
        (docs / "tech" / "ci-cd-workflow.md").write_text("my_script.py")
        runner = CliRunner()
        result = runner.invoke(
            main, ["--docs-dir", str(docs), "--source-dir", str(src), "--ci-scripts-dir", str(ci_dir)]
        )
        assert result.exit_code == 0
        assert "my_script.py" in result.output
        assert "OK: my_script.py" in result.output

    def test_ci_scripts_dir_nonexistent_skips(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When --ci-scripts-dir points to a non-existent path, CI checks are skipped."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "myapp"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        runner = CliRunner()
        result = runner.invoke(
            main, ["--docs-dir", str(docs), "--source-dir", str(src), "--ci-scripts-dir", "/nonexistent"]
        )
        assert result.exit_code == 0
        assert "100%" in result.output

    def test_config_from_pyproject_ci_scripts_dir(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When [tool.devx.doc_coverage] ci_scripts_dir is set in pyproject.toml, it's used."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "myapp"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("config.py")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        # Write pyproject.toml with ci_scripts_dir = ""
        (tmp_path / "pyproject.toml").write_text('[tool.devx.doc_coverage]\nci_scripts_dir = ""\n')
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs), "--source-dir", str(src)])
        assert result.exit_code == 0
        assert "100%" in result.output

    def test_config_from_pyproject_docs_dir(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When [tool.devx.doc_coverage] docs_dir is set in pyproject.toml, it's used."""
        monkeypatch.chdir(tmp_path)
        custom_docs = tmp_path / "custom-docs"
        (custom_docs / "user").mkdir(parents=True)
        (custom_docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "myapp"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (custom_docs / "user" / "cli-commands.md").write_text("## release\n")
        (custom_docs / "tech" / "architecture.md").write_text("config.py")
        (custom_docs / "tech" / "ci-cd-workflow.md").write_text("")
        # Write pyproject.toml with custom docs_dir
        (tmp_path / "pyproject.toml").write_text(
            f'[tool.devx.doc_coverage]\ndocs_dir = "{custom_docs}"\nci_scripts_dir = ""\n'
        )
        runner = CliRunner()
        result = runner.invoke(main, ["--source-dir", str(src)])
        assert result.exit_code == 0
        assert "100%" in result.output

    def test_config_from_pyproject_source_dir(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When [tool.devx.doc_coverage] source_dir is set in pyproject.toml, it's used."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        custom_src = tmp_path / "custom-src" / "myapp"
        custom_src.mkdir(parents=True)
        (custom_src / "__init__.py").write_text("")
        (custom_src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (custom_src / "config.py").write_text("# config")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("config.py")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        # Write pyproject.toml with custom source_dir
        (tmp_path / "pyproject.toml").write_text(
            f'[tool.devx.doc_coverage]\nsource_dir = "{custom_src}"\nci_scripts_dir = ""\n'
        )
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs)])
        assert result.exit_code == 0
        assert "100%" in result.output

    def test_config_doc_coverage_not_dict(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        """When [tool.devx.doc_coverage] is not a dict, falls back to defaults."""
        monkeypatch.chdir(tmp_path)
        docs = tmp_path / "docs"
        (docs / "user").mkdir(parents=True)
        (docs / "tech").mkdir(parents=True)
        src = tmp_path / "src" / "myapp"
        src.mkdir(parents=True)
        (src / "__init__.py").write_text("")
        (src / "cli.py").write_text(
            "@click.group()\ndef cli():\n    pass\n@cli.command('release')\ndef release():\n    pass\n"
        )
        (src / "config.py").write_text("# config")
        (docs / "user" / "cli-commands.md").write_text("## release\n")
        (docs / "tech" / "architecture.md").write_text("config.py")
        (docs / "tech" / "ci-cd-workflow.md").write_text("")
        # Write pyproject.toml with doc_coverage as a non-dict value
        (tmp_path / "pyproject.toml").write_text('[tool.devx]\ndoc_coverage = "not-a-dict"\n')
        runner = CliRunner()
        result = runner.invoke(main, ["--docs-dir", str(docs), "--source-dir", str(src)])
        assert result.exit_code == 0
        assert "100%" in result.output