import os
import shutil
from pathlib import Path
from llama_index.cli.new_package.templates import (
    pyproject_str,
    readme_str,
    init_str,
    init_with_prefix_str,
)
from typing import Optional


def _create_init_file(dir: str):
    # create __init__.py
    Path(dir + "/__init__.py").touch()


def _create_test_file(filename: str):
    Path(filename).touch()


def _makedirs(dir: str):
    try:
        os.makedirs(dir)
    except FileExistsError as e:
        pass


def init_new_package(
    integration_type: str,
    integration_name: str,
    prefix: Optional[str] = None,
):
    # create new directory, works in current directory
    pkg_name = (
        f"llama-index-{integration_type}-{integration_name}".replace(" ", "-")
        .replace("_", "-")
        .lower()
        if prefix is None
        else f"llama-index-{prefix}-{integration_type}-{integration_name}".replace(
            " ", "-"
        )
        .replace("_", "-")
        .lower()
    )
    pkg_path = os.path.join(os.getcwd(), pkg_name)
    tests_path = os.path.join(pkg_path, "tests")
    examples_path = os.path.join(pkg_path, "examples")
    pkg_src_dir = os.path.join(
        pkg_path,
        (
            f"llama_index/{integration_type}/{integration_name}".replace(
                " ", "_"
            ).lower()
            if prefix is None
            else f"llama_index/{prefix}/{integration_type}/{integration_name}".replace(
                " ", "_"
            ).lower()
        ),
    )

    # make dirs
    _makedirs(pkg_path)
    _makedirs(tests_path)
    _makedirs(examples_path)
    _makedirs(pkg_src_dir)

    # create init files
    _create_init_file(tests_path)
    with open(pkg_src_dir + "/__init__.py", "w") as f:
        init_string = (
            init_str.format(
                TYPE=integration_type.replace(" ", "_").lower(),
                NAME=integration_name.replace(" ", "_").lower(),
            )
            if prefix is None
            else init_with_prefix_str.format(
                TYPE=integration_type.replace(" ", "-").lower(),
                NAME=integration_name.replace(" ", "-").lower(),
                PREFIX=prefix.replace(" ", "_").lower(),
            )
        )
        f.write(init_string)

    # create pyproject.toml
    with open(pkg_path + "/pyproject.toml", "w") as f:
        f.write(
            pyproject_str.format(
                PACKAGE_NAME=pkg_name,
                TYPE=integration_type.lower(),
                NAME=integration_name.lower(),
            )
        )

    # create readme
    with open(pkg_path + "/README.md", "w") as f:
        f.write(
            readme_str.format(
                PACKAGE_NAME=pkg_name,
                TYPE=integration_type.lower().title(),
                NAME=integration_name.lower().title(),
            )
        )

    # create an empty test file
    test_file_name = tests_path + (
        f"/test_{integration_type}_{integration_name}.py".replace(" ", "_").lower()
        if prefix is None
        else f"/test_{prefix}_{integration_type}_{integration_name}.py".replace(
            " ", "_"
        ).lower()
    )
    _create_test_file(test_file_name)

    # copy common files to folders
    script_path = Path(__file__).parent.resolve()
    common_path = os.path.join(script_path, "common")
    shutil.copyfile(common_path + "/.gitignore", pkg_path + "/.gitignore")
    shutil.copyfile(common_path + "/Makefile", pkg_path + "/Makefile")
    shutil.copyfile(common_path + "/_build", pkg_path + "/BUILD")