from datetime import datetime, timedelta
from typing import Dict

from dateutil.parser import isoparse
from libretime_api_client.v2 import AirtimeApiClient as ApiClient
from libretime_shared.datetime import (
    time_fromisoformat,
    time_in_milliseconds,
    time_in_seconds,
)

from .events import EventKind

EVENT_KEY_FORMAT = "%Y-%m-%d-%H-%M-%S"


def datetime_to_event_key(value: datetime) -> str:
    return value.strftime(EVENT_KEY_FORMAT)


def get_schedule(api_client: ApiClient):
    current_time = datetime.utcnow()
    end_time = current_time + timedelta(days=1)

    current_time_str = current_time.isoformat(timespec="seconds")
    end_time_str = end_time.isoformat(timespec="seconds")

    schedule = api_client.services.schedule_url(
        params={
            "ends_after": f"{current_time_str}Z",
            "ends_before": f"{end_time_str}Z",
            "overbooked": False,
            "position_status__gt": 0,
        }
    )

    events = {}
    for item in schedule:
        item["starts_at"] = isoparse(item["starts_at"])
        item["ends_at"] = isoparse(item["ends_at"])

        show_instance = api_client.services.show_instance_url(id=item["instance_id"])
        show = api_client.services.show_url(id=show_instance["show_id"])

        if item["file"]:
            file = api_client.services.file_url(id=item["file_id"])
            events.update(generate_file_events(item, file, show))

        elif item["stream"]:
            webstream = api_client.services.webstream_url(id=item["stream_id"])
            events.update(generate_webstream_events(item, webstream, show))

    return {"media": events}


def generate_file_events(
    schedule: dict,
    file: dict,
    show: dict,
) -> Dict[str, dict]:
    """
    Generate events for a scheduled file.
    """
    events = {}

    schedule_start_event_key = datetime_to_event_key(schedule["starts_at"])
    schedule_end_event_key = datetime_to_event_key(schedule["ends_at"])

    events[schedule_start_event_key] = {
        "type": EventKind.FILE,
        "row_id": schedule["id"],
        "start": schedule_start_event_key,
        "end": schedule_end_event_key,
        "uri": file["url"],
        "id": file["id"],
        # Show data
        "show_name": show["name"],
        # Extra data
        "fade_in": time_in_milliseconds(time_fromisoformat(schedule["fade_in"])),
        "fade_out": time_in_milliseconds(time_fromisoformat(schedule["fade_out"])),
        "cue_in": time_in_seconds(time_fromisoformat(schedule["cue_in"])),
        "cue_out": time_in_seconds(time_fromisoformat(schedule["cue_out"])),
        "metadata": {
            "track_title": file["track_title"],
            "artist_name": file["artist_name"],
            "mime": file["mime"],
        },
        "replay_gain": file["replay_gain"],
        "filesize": file["size"],
    }

    return events


def generate_webstream_events(
    schedule: dict,
    webstream: dict,
    show: dict,
) -> Dict[str, dict]:
    """
    Generate events for a scheduled webstream.
    """
    events = {}

    schedule_start_event_key = datetime_to_event_key(schedule["starts_at"])
    schedule_end_event_key = datetime_to_event_key(schedule["ends_at"])

    events[schedule_start_event_key] = {
        "type": EventKind.STREAM_BUFFER_START,
        "row_id": schedule["id"],
        "start": datetime_to_event_key(schedule["starts_at"] - timedelta(seconds=5)),
        "end": datetime_to_event_key(schedule["starts_at"] - timedelta(seconds=5)),
        "uri": webstream["url"],
        "id": webstream["id"],
    }

    events[f"{schedule_start_event_key}_0"] = {
        "type": EventKind.STREAM_OUTPUT_START,
        "row_id": schedule["id"],
        "start": schedule_start_event_key,
        "end": schedule_end_event_key,
        "uri": webstream["url"],
        "id": webstream["id"],
        # Show data
        "show_name": show["name"],
    }

    # NOTE: stream_*_end were previously triggered 1 second before
    # the schedule end.
    events[schedule_end_event_key] = {
        "type": EventKind.STREAM_BUFFER_END,
        "row_id": schedule["id"],
        "start": schedule_end_event_key,
        "end": schedule_end_event_key,
        "uri": webstream["url"],
        "id": webstream["id"],
    }

    events[f"{schedule_end_event_key}_0"] = {
        "type": EventKind.STREAM_OUTPUT_END,
        "row_id": schedule["id"],
        "start": schedule_end_event_key,
        "end": schedule_end_event_key,
        "uri": webstream["url"],
        "id": webstream["id"],
    }

    return events