from pathlib import Path
import logging
import click

from iottb.definitions import DB_NAME, CFG_FILE_PATH
from iottb.models.iottb_config import IottbConfig

logger = logging.getLogger(__name__)


@click.group('util')
def tb():
    pass


@click.command()
@click.option('--file', default=DB_NAME)
@click.option('--table', type=str, default='DefaultDatabase')
@click.option('--key')
@click.option('--value')
@click.pass_context
def set_key_in_table_to(ctx, file, table, key, value):
    """Edit config or metadata files. TODO: Implement"""
    click.echo(f'set_key_in_table_to invoked')
    logger.warning("Unimplemented subcommand invoked.")


@click.command()
@click.confirmation_option(prompt="Are you certain that you want to delete the cfg file?")
def rm_cfg():
    """ Removes the cfg file from the filesystem.

        This is mostly a utility during development. Once non-standard database locations are implemented,
        deleting this would lead to iottb not being able to find them anymore.
    """
    Path(CFG_FILE_PATH).unlink()
    click.echo(f'Iottb configuration removed at {CFG_FILE_PATH}')


@click.command()
@click.confirmation_option(prompt="Are you certain that you want to delete the databases file?")
def rm_dbs(dbs):
    """ Removes ALL(!) databases from the filesystem if they're empty.

        Development utility currently unfit for use.
    """
    config = IottbConfig()
    paths = config.get_know_database_paths()
    logger.debug(f'Known db paths: {str(paths)}')
    for dbs in paths:
        try:
            Path(dbs).rmdir()
            click.echo(f'{dbs} deleted')
        except Exception as e:
            logger.debug(f'Failed unlinking db {dbs} with error {e}')
    logger.info(f'All databases deleted')


@click.command('show-cfg', help='Show the current configuration context')
@click.option('--cfg-file', type=click.Path(), default=CFG_FILE_PATH, help='Path to the config file')
@click.option('-pp', is_flag=True, default=False, help='Pretty Print')
@click.pass_context
def show_cfg(ctx, cfg_file, pp):
    logger.debug(f'Pretty print option set to {pp}')
    if pp:
        try:
            config = IottbConfig(Path(cfg_file))
            click.echo("Configuration Context:")
            click.echo(f"Default Database: {config.default_database}")
            click.echo(f"Default Database Path: {config.default_db_location}")
            click.echo("Database Locations:")
            for db_name, db_path in config.db_path_dict.items():
                click.echo(f"  - {db_name}: {db_path}")
        except Exception as e:
            logger.error(f"Error loading configuration: {e}")
            click.echo(f"Failed to load configuration from {cfg_file}")
    else:
        path = Path(cfg_file)

        if path.is_file():
            with path.open('r') as file:
                content = file.read()
                click.echo(content)
        else:
            click.echo(f"Configuration file not found at {cfg_file}")


@click.command('show-all', help='Show everything: configuration, databases, and device metadata')
@click.pass_context
def show_everything(ctx):
    """Show everything that can be recursively found based on config except file contents."""
    config = ctx.obj['CONFIG']
    click.echo("Configuration Context:")
    click.echo(f"Default Database: {config.default_database}")
    click.echo(f"Default Database Path: {config.default_db_location}")
    click.echo("Database Locations:")
    for db_name, db_path in config.db_path_dict.items():
        full_db_path = Path(db_path) / db_name
        click.echo(f"  - {db_name}: {full_db_path}")
        if full_db_path.is_dir():
            click.echo(f"Contents of {db_name} at {full_db_path}:")
            for item in full_db_path.iterdir():
                if item.is_file():
                    click.echo(f"    - {item.name}")
                    try:
                        with item.open('r', encoding='utf-8') as file:
                            content = file.read()
                            click.echo(f"      Content:\n{content}")
                    except UnicodeDecodeError:
                        click.echo("      Content is not readable as text")
                elif item.is_dir():
                    click.echo(f"    - {item.name}/")
                    for subitem in item.iterdir():
                        if subitem.is_file():
                            click.echo(f"      - {subitem.name}")
                        elif subitem.is_dir():
                            click.echo(f"      - {subitem.name}/")
        else:
            click.echo(f"  {full_db_path} is not a directory")


warnstyle = {'fg': 'red', 'bold': True}
click.secho('Developer command used', **warnstyle)