#!/usr/bin/python3
import inspect
import argparse
import bjoern
import sqlalchemy
from sqlalchemy.orm import RelationshipProperty, ColumnProperty


def install(arguments):
    from flaschengeist.app import create_app, install_all

    app = create_app()
    with app.app_context():
        install_all()


def run(arguments):
    from flaschengeist.app import create_app

    app = create_app()
    with app.app_context():
        if arguments.debug:
            app.run(arguments.host, arguments.port, debug=True)
        else:
            bjoern.run(app, arguments.host, arguments.port, reuse_port=True)


def export(arguments):
    import flaschengeist.system.models as models
    known = []
    done = []

    def orm_type(attr):
        if hasattr(attr, 'type'):
            tt = attr.type
        if isinstance(attr, ColumnProperty):
            tt = attr.columns[0].type
        elif isinstance(attr, RelationshipProperty):
            proto = "{}"
            if attr.key.endswith("s"):
                proto = "Array<{}>"
            return proto.format(attr.mapper.class_.__name__)
        else:
            raise TypeError("Couldn't inspect type.")
        tt = tt.__str__().split("(")[0]
        return {"INTEGER": "number",
                "VARCHAR": "string",
                "DATETIME": "Date"}[tt]

    def walker(mod, file):
        if inspect.isclass(mod[1]) and mod[1].__module__.startswith(models.__name__) and mod[0] not in done:
            mapper = sqlalchemy.inspect(mod[1], False)
            if mapper is not None:
                file.write("interface {} {{\n".format(mod[0]))
                for desc in mapper.attrs:
                    file.write("  {}: {};\n".format(desc.key, orm_type(desc)))
                file.write("}\n")
                done.append(mod[0])

        elif inspect.ismodule(mod[1]) and mod[1].__name__.startswith(models.__name__) and mod[1].__name__ not in known:
            known.append(mod[1].__name__)
            for cls in inspect.getmembers(mod[1], lambda x: inspect.isclass(x) or inspect.ismodule(x)):
                walker(cls, file)

    from flaschengeist.app import create_app

    app = create_app()
    with app.app_context():
        with open(arguments.file, "w") as file:
            walker(("models", models), file)


if __name__ == "__main__":
    # create the top-level parser
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(help="sub-command help", dest="sub_command")
    subparsers.required = True
    parser_run = subparsers.add_parser("run", help="run flaschengeist")
    parser_run.set_defaults(func=run)
    parser_run.add_argument("--host", help="set hostname to listen on", default="127.0.0.1")
    parser_run.add_argument("--port", help="set port to listen on", type=int, default=5000)
    parser_run.add_argument("--debug", help="run in debug mode", action="store_true")
    parser_install = subparsers.add_parser(
        "install", help="run database setup for flaschengeist and all installed plugins"
    )
    parser_install.set_defaults(func=install)
    parser_export = subparsers.add_parser("export", help="export models to typescript interfaces")
    parser_export.set_defaults(func=export)
    parser_export.add_argument("--file", help="Filename where to save", default="flaschengeist.d.ts")


    args = parser.parse_args()
    args.func(args)