from __future__ import annotations

import os
from pathlib import Path
from typing import cast

import asyncclick as click
from asyncclick import Context, UsageError

from aerich import Command
from aerich._compat import imports_tomlkit, tomllib
from aerich.enums import Color
from aerich.exceptions import DowngradeError
from aerich.utils import add_src_path, get_tortoise_config
from aerich.version import __version__

CONFIG_DEFAULT_VALUES = {
    "src_folder": ".",
}


@click.group(context_settings={"help_option_names": ["-h", "--help"]})
@click.version_option(__version__, "-V", "--version")
@click.option(
    "-c",
    "--config",
    default="pyproject.toml",
    show_default=True,
    help="Config file.",
)
@click.option("--app", required=False, help="Tortoise-ORM app name.")
@click.pass_context
async def cli(ctx: Context, config, app) -> None:
    ctx.ensure_object(dict)
    ctx.obj["config_file"] = config

    invoked_subcommand = ctx.invoked_subcommand
    if invoked_subcommand != "init":
        config_path = Path(config)
        if not config_path.exists():
            raise UsageError(
                "You need to run `aerich init` first to create the config file.", ctx=ctx
            )
        content = config_path.read_text("utf-8")
        doc: dict = tomllib.loads(content)
        try:
            tool = cast("dict[str, str]", doc["tool"]["aerich"])
            location = tool["location"]
            tortoise_orm = tool["tortoise_orm"]
            src_folder = tool.get("src_folder", CONFIG_DEFAULT_VALUES["src_folder"])
        except KeyError as e:
            raise UsageError(
                "You need run `aerich init` again when upgrading to aerich 0.6.0+."
            ) from e
        add_src_path(src_folder)
        tortoise_config = get_tortoise_config(ctx, tortoise_orm)
        if not app:
            try:
                apps_config = cast(dict, tortoise_config["apps"])
            except KeyError:
                raise UsageError('Config must define "apps" section')
            app = list(apps_config.keys())[0]
        command = Command(tortoise_config=tortoise_config, app=app, location=location)
        ctx.obj["command"] = command
        if invoked_subcommand != "init-db":
            if not Path(location, app).exists():
                raise UsageError(
                    "You need to run `aerich init-db` first to initialize the database.", ctx=ctx
                )
            await command.init()


@cli.command(help="Generate a migration file for the current state of the models.")
@click.option("--name", default="update", show_default=True, help="Migration name.")
@click.option("--empty", default=False, is_flag=True, help="Generate an empty migration file.")
@click.pass_context
async def migrate(ctx: Context, name, empty) -> None:
    command = ctx.obj["command"]
    ret = await command.migrate(name, empty)
    if not ret:
        return click.secho("No changes detected", fg=Color.yellow)
    click.secho(f"Success creating migration file {ret}", fg=Color.green)


@cli.command(help="Upgrade to specified migration version.")
@click.option(
    "--in-transaction",
    "-i",
    default=True,
    type=bool,
    help="Make migrations in a single transaction or not. Can be helpful for large migrations or creating concurrent indexes.",
)
@click.option(
    "--fake",
    default=False,
    is_flag=True,
    help="Mark migrations as run without actually running them.",
)
@click.pass_context
async def upgrade(ctx: Context, in_transaction: bool, fake: bool) -> None:
    command = ctx.obj["command"]
    migrated = await command.upgrade(run_in_transaction=in_transaction, fake=fake)
    if not migrated:
        click.secho("No upgrade items found", fg=Color.yellow)
    else:
        for version_file in migrated:
            if fake:
                click.echo(
                    f"Upgrading to {version_file}... " + click.style("FAKED", fg=Color.green)
                )
            else:
                click.secho(f"Success upgrading to {version_file}", fg=Color.green)


@cli.command(help="Downgrade to specified version.")
@click.option(
    "-v",
    "--version",
    default=-1,
    type=int,
    show_default=False,
    help="Specified version, default to last migration.",
)
@click.option(
    "-d",
    "--delete",
    is_flag=True,
    default=False,
    show_default=True,
    help="Also delete the migration files.",
)
@click.option(
    "--fake",
    default=False,
    is_flag=True,
    help="Mark migrations as run without actually running them.",
)
@click.pass_context
@click.confirmation_option(
    prompt="Downgrade is dangerous: you might lose your data! Are you sure?",
)
async def downgrade(ctx: Context, version: int, delete: bool, fake: bool) -> None:
    command = ctx.obj["command"]
    try:
        files = await command.downgrade(version, delete, fake=fake)
    except DowngradeError as e:
        return click.secho(str(e), fg=Color.yellow)
    for file in files:
        if fake:
            click.echo(f"Downgrading to {file}... " + click.style("FAKED", fg=Color.green))
        else:
            click.secho(f"Success downgrading to {file}", fg=Color.green)


@cli.command(help="Show currently available heads (unapplied migrations).")
@click.pass_context
async def heads(ctx: Context) -> None:
    command = ctx.obj["command"]
    head_list = await command.heads()
    if not head_list:
        return click.secho("No available heads.", fg=Color.green)
    for version in head_list:
        click.secho(version, fg=Color.green)


@cli.command(help="List all migrations.")
@click.pass_context
async def history(ctx: Context) -> None:
    command = ctx.obj["command"]
    versions = await command.history()
    if not versions:
        return click.secho("No migrations created yet.", fg=Color.green)
    for version in versions:
        click.secho(version, fg=Color.green)


def _write_config(config_path, doc, table) -> None:
    tomlkit = imports_tomlkit()

    try:
        doc["tool"]["aerich"] = table
    except KeyError:
        doc["tool"] = {"aerich": table}
    config_path.write_text(tomlkit.dumps(doc))


@cli.command(help="Initialize aerich config and create migrations folder.")
@click.option(
    "-t",
    "--tortoise-orm",
    required=True,
    help="Tortoise-ORM config dict location, like `settings.TORTOISE_ORM`.",
)
@click.option(
    "--location",
    default="./migrations",
    show_default=True,
    help="Migrations folder.",
)
@click.option(
    "-s",
    "--src_folder",
    default=CONFIG_DEFAULT_VALUES["src_folder"],
    show_default=False,
    help="Folder of the source, relative to the project root.",
)
@click.pass_context
async def init(ctx: Context, tortoise_orm, location, src_folder) -> None:
    config_file = ctx.obj["config_file"]

    if os.path.isabs(src_folder):
        src_folder = os.path.relpath(os.getcwd(), src_folder)
    # Add ./ so it's clear that this is relative path
    if not src_folder.startswith("./"):
        src_folder = "./" + src_folder

    # check that we can find the configuration, if not we can fail before the config file gets created
    add_src_path(src_folder)
    get_tortoise_config(ctx, tortoise_orm)
    config_path = Path(config_file)
    content = config_path.read_text("utf-8") if config_path.exists() else "[tool.aerich]"
    doc: dict = tomllib.loads(content)

    table = {"tortoise_orm": tortoise_orm, "location": location, "src_folder": src_folder}
    if (aerich_config := doc.get("tool", {}).get("aerich")) and all(
        aerich_config.get(k) == v for k, v in table.items()
    ):
        click.echo(f"Aerich config {config_file} already inited.")
    else:
        _write_config(config_path, doc, table)
        click.secho(f"Success writing aerich config to {config_file}", fg=Color.green)

    Path(location).mkdir(parents=True, exist_ok=True)
    click.secho(f"Success creating migrations folder {location}", fg=Color.green)


@cli.command(help="Generate schema and generate app migration folder.")
@click.option(
    "-s",
    "--safe",
    type=bool,
    is_flag=True,
    default=True,
    help="Create tables only when they do not already exist.",
    show_default=True,
)
@click.pass_context
async def init_db(ctx: Context, safe: bool) -> None:
    command = ctx.obj["command"]
    app = command.app
    dirname = Path(command.location, app)
    try:
        await command.init_db(safe)
        click.secho(f"Success creating app migration folder {dirname}", fg=Color.green)
        click.secho(f'Success generating initial migration file for app "{app}"', fg=Color.green)
    except FileExistsError:
        return click.secho(
            f"App {app} is already initialized. Delete {dirname} and try again.", fg=Color.yellow
        )


@cli.command(help="Prints the current database tables to stdout as Tortoise-ORM models.")
@click.option(
    "-t",
    "--table",
    help="Which tables to inspect.",
    multiple=True,
    required=False,
)
@click.pass_context
async def inspectdb(ctx: Context, table: list[str]) -> None:
    command = ctx.obj["command"]
    ret = await command.inspectdb(table)
    click.secho(ret)


def main() -> None:
    cli()


if __name__ == "__main__":
    main()