libretime/playout/libretime_playout/player/schedule.py

from datetime import datetime, time, timedelta
from operator import itemgetter
from typing import Dict

from libretime_api_client.v2 import ApiClient
from libretime_shared.datetime import time_in_milliseconds, time_in_seconds

from ..liquidsoap.models import StreamPreferences
from .events import (
    ActionEvent,
    AnyEvent,
    EventKind,
    Events,
    FileEvent,
    WebStreamEvent,
    datetime_to_event_key,
    event_isoparse,
)


def insert_event(events: Events, event_key: str, event: AnyEvent) -> None:
    key = event_key

    # Search for an empty slot
    index = 0
    while key in events:
        # Ignore duplicate event
        if event == events[key]:
            return

        key = f"{event_key}_{index}"
        index += 1

    events[key] = event


def get_schedule(api_client: ApiClient) -> Events:
    stream_preferences = StreamPreferences(**api_client.get_stream_preferences().json())

    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.list_schedule(
        params={
            "ends_after": f"{current_time_str}Z",
            "ends_before": f"{end_time_str}Z",
            "overbooked": False,
            "position_status__gt": 0,
        }
    ).json()

    events: Dict[str, AnyEvent] = {}
    for item in sorted(schedule, key=itemgetter("starts_at")):
        item["starts_at"] = event_isoparse(item["starts_at"])
        item["ends_at"] = event_isoparse(item["ends_at"])

        show_instance = api_client.get_show_instance(item["instance"]).json()
        show = api_client.get_show(show_instance["show"]).json()

        if show["live_enabled"]:
            show_instance["starts_at"] = event_isoparse(show_instance["starts_at"])
            show_instance["ends_at"] = event_isoparse(show_instance["ends_at"])
            generate_live_events(events, show_instance, stream_preferences)

        if item["file"]:
            file = api_client.get_file(item["file"]).json()
            generate_file_events(events, item, file, show, stream_preferences)

        elif item["stream"]:
            webstream = api_client.get_webstream(item["stream"]).json()
            generate_webstream_events(events, item, webstream, show)

    return dict(sorted(events.items()))


def generate_live_events(
    events: Events,
    show_instance: dict,
    stream_preferences: StreamPreferences,
):
    transition = timedelta(seconds=stream_preferences.input_fade_transition)

    switch_off = show_instance["ends_at"] - transition
    kick_out = show_instance["ends_at"]
    switch_off_event_key = datetime_to_event_key(switch_off)
    kick_out_event_key = datetime_to_event_key(kick_out)

    # If enabled, fade the input source out
    if switch_off != kick_out:
        switch_off_event = ActionEvent(
            type=EventKind.ACTION,
            event_type="switch_off",
            start=switch_off,
            end=switch_off,
        )
        insert_event(events, switch_off_event_key, switch_off_event)

    # Then kick the source out
    kick_out_event = ActionEvent(
        type=EventKind.ACTION,
        event_type="kick_out",
        start=kick_out,
        end=kick_out,
    )
    insert_event(events, kick_out_event_key, kick_out_event)


def generate_file_events(
    events: Events,
    schedule: dict,
    file: dict,
    show: dict,
    stream_preferences: StreamPreferences,
):
    """
    Generate events for a scheduled file.
    """
    event = FileEvent(
        type=EventKind.FILE,
        row_id=schedule["id"],
        start=schedule["starts_at"],
        end=schedule["ends_at"],
        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"])),
        # File data
        track_title=file.get("track_title"),
        artist_name=file.get("artist_name"),
        mime=file["mime"],
        replay_gain=file["replay_gain"],
        filesize=file["size"],
    )

    if event.replay_gain is None:
        event.replay_gain = 0.0

    if stream_preferences.replay_gain_enabled:
        event.replay_gain += stream_preferences.replay_gain_offset
    else:
        event.replay_gain = None

    insert_event(events, event.start_key, event)


def generate_webstream_events(
    events: Events,
    schedule: dict,
    webstream: dict,
    show: dict,
):
    """
    Generate events for a scheduled webstream.
    """
    schedule_start_event_key = datetime_to_event_key(schedule["starts_at"])
    schedule_end_event_key = datetime_to_event_key(schedule["ends_at"])

    stream_buffer_start_event = WebStreamEvent(
        type=EventKind.WEB_STREAM_BUFFER_START,
        row_id=schedule["id"],
        start=schedule["starts_at"] - timedelta(seconds=5),
        end=schedule["starts_at"] - timedelta(seconds=5),
        uri=webstream["url"],
        id=webstream["id"],
        # Show data
        show_name=show["name"],
    )
    insert_event(events, schedule_start_event_key, stream_buffer_start_event)

    stream_output_start_event = WebStreamEvent(
        type=EventKind.WEB_STREAM_OUTPUT_START,
        row_id=schedule["id"],
        start=schedule["starts_at"],
        end=schedule["ends_at"],
        uri=webstream["url"],
        id=webstream["id"],
        # Show data
        show_name=show["name"],
    )
    insert_event(events, schedule_start_event_key, stream_output_start_event)

    # NOTE: stream_*_end were previously triggered 1 second before
    # the schedule end.
    stream_buffer_end_event = WebStreamEvent(
        type=EventKind.WEB_STREAM_BUFFER_END,
        row_id=schedule["id"],
        start=schedule["ends_at"],
        end=schedule["ends_at"],
        uri=webstream["url"],
        id=webstream["id"],
        # Show data
        show_name=show["name"],
    )
    insert_event(events, schedule_end_event_key, stream_buffer_end_event)

    stream_output_end_event = WebStreamEvent(
        type=EventKind.WEB_STREAM_OUTPUT_END,
        row_id=schedule["id"],
        start=schedule["ends_at"],
        end=schedule["ends_at"],
        uri=webstream["url"],
        id=webstream["id"],
        # Show data
        show_name=show["name"],
    )
    insert_event(events, schedule_end_event_key, stream_output_end_event)