#!/usr/bin/env python

from typing import List

import click
import docker
from django.apps import apps

from sentry.runner import configure
from sentry.silo.base import SiloMode

configure()

from django.conf import settings

from sentry.models.organizationmapping import OrganizationMapping


def exec_run(container, command):
    wrapped_command = f'sh -c "{" ".join(command)}"'
    exit_code, output = container.exec_run(cmd=wrapped_command, stdout=True, stderr=True)
    if exit_code:
        click.echo("Container operation Failed!")
        click.echo(f"Container operation failed with {output}")


def split_database(tables: List[str], source: str, destination: str, reset: bool, verbose: bool):
    click.echo(f">> Dumping tables from {source} database")
    command = ["pg_dump", "-U", "postgres", "-d", source, "--clean"]
    for table in tables:
        command.extend(["-t", table])
    command.extend([">", f"/tmp/{destination}-tables.sql"])

    client = docker.from_env()
    postgres = client.containers.get("sentry_postgres")

    if verbose:
        click.echo(f">> Running {' '.join(command)}")
    exec_run(postgres, command)

    if reset:
        click.echo(f">> Dropping existing {destination} database")
        exec_run(postgres, ["dropdb", "-U", "postgres", "--if-exists", destination])
        exec_run(postgres, ["createdb", "-U", "postgres", destination])

    # Use the dump file to build control silo tables.
    click.echo(f">> Building {destination} database from dump file")
    import_command = ["psql", "-U", "postgres", destination, "<", f"/tmp/{destination}-tables.sql"]
    if verbose:
        click.echo(f">> Running {' '.join(import_command)}")
    exec_run(postgres, import_command)


def revise_organization_mappings(legacy_region_name: str):
    if settings.SENTRY_MONOLITH_REGION == legacy_region_name:
        click.echo(
            "> No OrganizationMapping have been modified. Set 'SENTRY_MONOLITH_REGION' in sentry.conf.py to update monolith mappings."
        )
    else:
        qs = OrganizationMapping.objects.filter(region_name=legacy_region_name)
        record_count = len(qs)
        qs.update(region_name=settings.SENTRY_MONOLITH_REGION)
        click.echo(
            f"> {record_count} OrganizationMapping record(s) have been updated from '{legacy_region_name}' to '{settings.SENTRY_MONOLITH_REGION}'"
        )


@click.command()
@click.option(
    "--legacy-region-name",
    default="--monolith--",
    help="Previous value of settings.SENTRY_MONOLITH_REGION to overwrite in organization mappings",
)
@click.option("--verbose", default=False, is_flag=True, help="Enable verbose logging")
@click.option(
    "--reset",
    default=False,
    is_flag=True,
    help="Reset the target databases to be empty before loading extracted data and schema.",
)
@click.option("--database", default="sentry", help="Which database to derive splits from")
def main(database: str, reset: bool, verbose: bool, legacy_region_name: str):
    """
    This is a development tool that can convert a monolith database into
    control + region databases by using silo annotations.

    This operation will not modify the original source database.
    """
    # We have a few tables that either need to be in both silos,
    # or only in control. These tables don't have silo annotations
    # as they are inherited from django and their silo assignments
    # need to be manually defined.
    region_tables = ["django_migrations", "django_content_type"]
    control_tables = [
        "django_migrations",
        "django_admin_log",
        "django_content_type",
        "django_site",
        "django_session",
        "auth_user",
        "auth_group",
        "auth_permission",
        "auth_group_permissions",
        "auth_user_groups",
        "auth_user_user_permissions",
    ]
    for model in apps.get_models():
        silo_limit = getattr(model._meta, "silo_limit", None)
        if not silo_limit:
            click.echo(f"> Could not find silo assignment for {model._meta.db_table}")
            continue
        if SiloMode.CONTROL in silo_limit.modes:
            control_tables.append(model._meta.db_table)
        if SiloMode.REGION in silo_limit.modes:
            region_tables.append(model._meta.db_table)

    revise_organization_mappings(legacy_region_name=legacy_region_name)
    split_database(control_tables, database, "control", reset=reset, verbose=verbose)
    split_database(region_tables, database, "region", reset=reset, verbose=verbose)


if __name__ == "__main__":
    main()