"""Implementation of the `gentem new` command."""

from datetime import datetime
from pathlib import Path
from typing import Optional

from rich import print
from rich.panel import Panel
from rich.table import Table

from gentem.template_engine import TemplateEngine, get_template_engine
from gentem.utils.validators import (
    ValidationError,
    validate_license_type,
    validate_project_name,
    validate_project_type,
    validate_output_path,
)


def generate_slug(name: str) -> str:
    """Generate a URL-safe slug from the project name."""
    return name.lower().replace("_", "-").replace(" ", "-")


def generate_class_name(name: str) -> str:
    """Generate a Python class name from the project name."""
    # Convert to PascalCase
    return "".join(word.capitalize() for word in name.split("_"))


def generate_context(
    project_name: str,
    project_type: str,
    author: str,
    description: str,
    license_type: str,
) -> dict:
    """Generate the template context for a new project.

    Args:
        project_name: Name of the project.
        project_type: Type of project (library, cli, script).
        author: Author name.
        description: Project description.
        license_type: License type.

    Returns:
        Dictionary of template variables.
    """
    now = datetime.now()
    year = now.year

    return {
        "project_name": project_name,
        "project_slug": generate_slug(project_name),
        "class_name": generate_class_name(project_name),
        "project_type": project_type,
        "author": author or "Gentem User",
        "email": f"user@{generate_slug(project_name)}.dev",
        "description": description or f"A {project_type} project generated by Gentem.",
        "version": "0.1.0",
        "python_version": "3.9",
        "python_versions": ["3.10", "3.11", "3.12"],
        "license": license_type.upper() if license_type else "MIT",
        "year": year,
        "month": now.strftime("%B"),
        "cli_enabled": project_type == "cli",
        "library_enabled": project_type == "library",
        "script_enabled": project_type == "script",
    }


def get_license_content(license_type: str, context: dict) -> str:
    """Get the license content based on type.

    Args:
        license_type: Type of license.
        context: Template context.

    Returns:
        License content string.
    """
    license_type = license_type.lower()

    if license_type == "mit":
        return f'''MIT License

Copyright (c) {context["year"]} {context["author"]}

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'''
    elif license_type == "apache":
        return f'''Apache License
Version 2.0, January 2004
http://www.apache.org/

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

1. Definitions.

"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.

"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.

"Legal Entity" shall mean the union of the acting entity and all
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use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.

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Work or Derivative Works thereof in any medium, with or without
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meet the following conditions:

(a) You must give any other recipients of the Work or
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(d) If the Work includes a "NOTICE" text file as part of its
    distribution, then any Derivative Works that You distribute must
    include a readable copy of the attribution notices contained
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    pertain to any part of the Derivative Works, in at least one
    of the following places: within a NOTICE text file distributed
    as part of the Derivative Works; within the Source form or
    documentation, if provided along with the Derivative Works; or,
    within a display generated by the Derivative Works, if and
    wherever such third-party notices normally appear. The contents
    of the NOTICE file are for informational purposes only and
    do not modify the License. You may add Your own attribution
    notices within Derivative Works that You distribute, alongside
    or as an addendum to the NOTICE text from the Work, provided
    that such additional attribution notices cannot be construed
    as modifying the License.

5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
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Notwithstanding the above, nothing herein shall supersede or modify
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6. Trademarks. This License does not grant permission to use the
trade names, trademarks, service marks, or product names of the
Licensor, except as required for reasonable and customary use
in describing the origin of the Work and reproducing the content
of the NOTICE file.

7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
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appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.

8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.

9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.

END OF TERMS AND CONDITIONS

APPENDIX: How to apply the Apache License to your work.

To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!)  The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.

Copyright [yyyy] [name of copyright owner]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing
permissions and limitations under the License.
'''
    elif license_type == "gpl":
        return f'''GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Copyright (C) {context["year"]} {context["author"]}

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''
    else:
        return ""


def create_new_project(
    project_name: str,
    project_type: str = "library",
    author: str = "",
    description: str = "",
    license_type: str = "mit",
    dry_run: bool = False,
    verbose: bool = False,
) -> None:
    """Create a new Python project.

    Args:
        project_name: Name of the project to create.
        project_type: Type of project (library, cli, script).
        author: Author name.
        description: Project description.
        license_type: License type.
        dry_run: Preview without creating files.
        verbose: Show verbose output.
    """
    # Validate inputs
    try:
        project_name = validate_project_name(project_name)
        project_type = validate_project_type(project_type)
        license_type = validate_license_type(license_type)
    except ValidationError as e:
        print(f"[red]Error: {e}[/]")
        raise SystemExit(1)

    # Generate template context
    context = generate_context(
        project_name=project_name,
        project_type=project_type,
        author=author,
        description=description,
        license_type=license_type,
    )

    # Determine output path
    output_path = Path.cwd() / project_name

    if verbose:
        print(f"Output path: {output_path}")
        print(f"Project type: {project_type}")

    # Show summary
    print(Panel(
        f"[bold]Creating new {project_type} project:[/] [cyan]{project_name}[/]\n"
        f"[dim]Author:[/] {context['author']}\n"
        f"[dim]License:[/] {context['license']}\n"
        f"[dim]Python:[/] {', '.join(context['python_versions'])}",
        title="Gentem",
        expand=False,
    ))

    if dry_run:
        print("[yellow]DRY RUN - No files will be created[/]")
        print(f"\nProject would be created at: {output_path}")
        print("\nFiles that would be created:")
        for item in get_project_files(project_name, project_type):
            print(f"  - {item}")
        return

    # Create project files
    try:
        create_project_files(
            project_name=project_name,
            project_type=project_type,
            context=context,
            output_path=output_path,
            license_content=get_license_content(license_type, context),
        )
        print(f"\n[green]✓ Project '{project_name}' created successfully![/]")
        print(f"\nNext steps:")
        print(f"  cd {project_name}")
        if project_type == "library":
            print(f"  pip install -e .")
        elif project_type == "cli":
            print(f"  pip install -e .")
            print(f"  {project_name} --help")
        print(f"  git init")
    except Exception as e:
        print(f"[red]Error creating project: {e}[/]")
        raise SystemExit(1)


def get_project_files(project_name: str, project_type: str) -> list[str]:
    """Get list of files that would be created for a project.

    Args:
        project_name: Name of the project.
        project_type: Type of project.

    Returns:
        List of file paths.
    """
    slug = generate_slug(project_name)
    files = [
        f"{project_name}/",
        f"{project_name}/pyproject.toml",
        f"{project_name}/README.md",
        f"{project_name}/LICENSE",
        f"{project_name}/.gitignore",
    ]

    if project_type == "library":
        files.extend([
            f"{project_name}/app/",
            f"{project_name}/app/__init__.py",
            f"{project_name}/tests/",
            f"{project_name}/tests/__init__.py",
            f"{project_name}/tests/test_{slug}.py",
        ])
    elif project_type == "cli":
        files.extend([
            f"{project_name}/app/",
            f"{project_name}/app/__init__.py",
            f"{project_name}/app/cli.py",
            f"{project_name}/app/main.py",
        ])
    elif project_type == "script":
        files.extend([
            f"{project_name}/{slug}.py",
        ])

    return files


def create_project_files(
    project_name: str,
    project_type: str,
    context: dict,
    output_path: Path,
    license_content: str,
) -> None:
    """Create all project files.

    Args:
        project_name: Name of the project.
        project_type: Type of project.
        context: Template context.
        output_path: Path to create the project at.
        license_content: License file content.
    """
    slug = generate_slug(project_name)

    # Create directories
    output_path.mkdir(parents=True, exist_ok=False)

    # Create pyproject.toml
    scripts_line = f'{slug} = "{slug}.main:main"' if project_type == "cli" else ""
    pyproject_content = f'''[build-system]
requires = ["setuptools>=61.0", "wheel"]
build-backend = "setuptools.build_meta"

[project]
name = "{slug}"
version = "{context["version"]}"
description = "{context["description"]}"
readme = "README.md"
license = {{text = "{context["license"]}"}}
requires-python = ">={context["python_version"]}"
authors = [{{name = "{context["author"]}", email = "{context["email"]}"}}]
keywords = ["{slug}"]
classifiers = [
    "Development Status :: 3 - Alpha",
    "Intended Audience :: Developers",
    "License :: OSI Approved :: {context["license"]} License",
    "Programming Language :: Python :: 3",
]
dependencies = []

[project.optional-dependencies]
dev = [
    "pytest>=7.4.0",
    "black>=23.0.0",
    "ruff>=0.1.0",
    "mypy>=1.5.0",
]

[project.scripts]
{str(scripts_line)}

[tool.setuptools.packages.find]
where = ["app"]

[tool.pytest.ini_options]
testpaths = ["tests"]
python_files = ["test_*.py"]
addopts = "-v --tb=short"

[tool.black]
line-length = 100
target-version = ["py39", "py310", "py311", "py312"]

[tool.ruff]
line-length = 100
select = ["E", "W", "F", "I", "B", "C4", "UP"]
ignore = ["E501", "B008", "C901"]
'''

    # Create README.md
    readme_content = f'''# {project_name}

{context["description"]}

## Installation

```bash
pip install {slug}
```

## Usage

```python
import {slug}
```

## Development

```bash
# Install development dependencies
pip install -e ".[dev]"

# Run tests
pytest

# Format code
black .
ruff check --fix .
```

## License

This project is licensed under the {context["license"]} License - see the [LICENSE](LICENSE) file for details.
'''

    # Create .gitignore
    gitignore_content = '''# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class

# C extensions
*.so

# Distribution / packaging
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
pip-wheel-metadata/
share/python-wheels/
*.egg-info/
.installed.cfg
*.egg
MANIFEST

# PyInstaller
*.manifest
*.spec

# Installer logs
pip-log.txt
pip-delete-this-directory.txt

# Unit test / coverage reports
htmlcov/
.tox/
.nox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
*.py,cover
.hypothesis/
.pytest_cache/

# Translations
*.mo
*.pot

# Django stuff:
*.log
local_settings.py
db.sqlite3
db.sqlite3-journal

# Flask stuff:
instance/
.webassets-cache

# Scrapy stuff:
.scrapy

# Sphinx documentation
docs/_build/

# PyBuilder
target/

# Jupyter Notebook
.ipynb_checkpoints

# IPython
profile_default/
ipython_config.py

# pyenv
.python-version

# pipenv
Pipfile.lock

# PEP 582
__pypackages__/

# Celery stuff
celerybeat-schedule
celerybeat.pid

# SageMath parsed files
*.sage.py

# Environments
.env
.venv
env/
venv/
ENV/
env.bak/
venv.bak/

# Spyder project settings
.spyderproject
.spyproject

# Rope project settings
.ropeproject

# mkdocs documentation
/site

# mypy
.mypy_cache/
.dmypy.json
dmypy.json

# Pyre type checker
.pyre/

# IDEs
.vscode/
.idea/
*.swp
*.swo
*~

# OS
.DS_Store
Thumbs.db
'''

    # Write common files
    (output_path / "pyproject.toml").write_text(pyproject_content, encoding="utf-8")
    (output_path / "README.md").write_text(readme_content, encoding="utf-8")
    (output_path / ".gitignore").write_text(gitignore_content, encoding="utf-8")
    if license_content:
        (output_path / "LICENSE").write_text(license_content, encoding="utf-8")

    # Create type-specific files
    if project_type == "library":
        app_dir = output_path / "app"
        app_dir.mkdir(parents=True, exist_ok=True)
        (app_dir / "__init__.py").write_text(f'"""{project_name} - {context["description"]}."""\n', encoding="utf-8")

        tests_dir = output_path / "tests"
        tests_dir.mkdir(parents=True, exist_ok=True)
        (tests_dir / "__init__.py").write_text('"""Tests for app."""\n', encoding="utf-8")
        (tests_dir / f"test_{slug}.py").write_text(f'''"""Tests for {slug}."""

import pytest

from app import __version__


def test_version():
    """Test that version is set correctly."""
    assert __version__ == "{context["version"]}"


def test_import():
    """Test that the package can be imported."""
    import app
    assert app is not None
''', encoding="utf-8")

    elif project_type == "cli":
        app_dir = output_path / "app"
        app_dir.mkdir(parents=True, exist_ok=True)

        (app_dir / "__init__.py").write_text(f'"""{project_name} - {context["description"]}."""\n', encoding="utf-8")
        (app_dir / "cli.py").write_text(f'''"""CLI commands for {project_name}."""

import typer

app = typer.Typer()


@app.command()
def hello(name: str = "World") -> None:
    """Say hello to someone."""
    print(f"Hello, {{name}}!")


@app.command()
def version() -> None:
    """Show the version."""
    print("{context["version"]}")
''', encoding="utf-8")
        (app_dir / "main.py").write_text(f'''"""Main entry point for {project_name}."""

from app.cli import app


def main() -> None:
    """Entry point for the CLI."""
    app()
''', encoding="utf-8")

    elif project_type == "script":
        (output_path / f"{slug}.py").write_text(f'''#!/usr/bin/env python3
"""{project_name} - {context["description"]}."""

def main() -> None:
    """Main entry point."""
    print("Hello from {project_name}!")


if __name__ == "__main__":
    main()
''', encoding="utf-8")
