#!/usr/bin/python3

import argparse
import importlib
import os
import sys
from uuid import UUID

import etv_client
from etv_client.api import ScriptedScheduleApi


def main():
    parser = argparse.ArgumentParser(description="Run an ETV scripted schedule")
    parser.add_argument("host", help="The ETV host (e.g., http://localhost:8409)")
    parser.add_argument("build_id", type=UUID, help="The build ID for the playout")
    parser.add_argument("mode", choices=["reset", "continue"], help="The playout build mode")
    parser.add_argument("script_name", help="The name of the script module to use (e.g., one)")

    known_args, unknown_args = parser.parse_known_args()

    try:
        script_module = importlib.import_module(f"scripts.{known_args.script_name}")
    except ImportError:
        print(f"Error: cannot find a script file named '{known_args.script_name}.py' in the 'scripts' directory.")
        sys.exit(1)

    configuration = etv_client.Configuration(host=known_args.host)

    # ErsatzTV mints a token per build and passes it in the environment; the scripted callback endpoints
    # reject a request without it (ersatztv#913). A custom header, not the machine X-Api-Key.
    build_token = os.environ.get("ETV_SCRIPTED_BUILD_TOKEN")

    with etv_client.ApiClient(configuration) as api_client:
        if build_token:
            api_client.set_default_header("X-Scripted-Build-Token", build_token)

        try:
            define_content = script_module.define_content
            reset_playout = script_module.reset_playout
            build_playout = script_module.build_playout

            api_instance = ScriptedScheduleApi(api_client)

            context = api_instance.get_context(known_args.build_id)

            define_content(api_instance, context, known_args.build_id)

            if known_args.mode == "reset":
                new_context = reset_playout(api_instance, context, known_args.build_id)
                context = new_context or api_instance.get_context(known_args.build_id)

            build_playout(api_instance, context, known_args.build_id)
        except etv_client.ApiException as e:
            print(f"Exception when calling scripted schedule api: {e}\n")
        except AttributeError as e:
            print(f"Error: the '{known_args.script_name}' script is missing a required function. {e}")


if __name__ == "__main__":
    main()