# -*- encoding: utf-8 -*-

import os.path
import typing as T

import click
import jinja2
import yaml


def read_config(path: T.Text) -> T.Dict[T.Text, T.Any]:
    """
    Read the config from the specified path
    """
    if not os.path.exists(path):
        raise ValueError(f"File does not exist {path}")

    with open(path) as f:
        data = yaml.safe_load(f)

    if not isinstance(data, dict):
        raise ValueError(f"Malformed configuration")

    return data


def render_template(data: T.Dict[T.Text, T.Any], path: T.Text, dry_run: bool) -> None:
    """
    Given the configuration values, renders the template into the desired path.
    """
    loader = jinja2.PackageLoader("piker", "template")
    env = jinja2.Environment(
        loader=loader, autoescape=jinja2.select_autoescape(["yaml"])
    )
    template = env.get_template("drone.yml.j2")
    value = template.render(**data)
    if dry_run:
        print(value)
        return
    with open(path, "w") as out:
        out.write(value)


@click.command()
@click.option(
    "--dry-run/--no-dry-run",
    default=False,
    help="Display result without actually writing it",
)
@click.argument("config", type=click.Path(exists=True), default="./piker.yml")
@click.argument("target", type=click.Path(), default="./.drone.yml")
def cli(dry_run: bool, config: T.Text, target: T.Text) -> None:
    """
    CLI entrypoint
    """
    conf_data = read_config(config)
    render_template(conf_data, target, dry_run)