use chrono::Utc;

use domain::events::DomainEvent;
use domain::models::GeneratedSchedule;
use domain::value_objects::ChannelId;
use domain::DomainResult;

use super::commands::GenerateScheduleCommand;
use super::deps::ScheduleDeps;

/// Generate a new 7-day schedule for a channel.
///
/// Delegates the heavy lifting to `ScheduleEngineService::generate_schedule`,
/// then publishes a `ScheduleGenerated` domain event.
pub async fn execute(
    deps: &ScheduleDeps,
    cmd: GenerateScheduleCommand,
) -> DomainResult<GeneratedSchedule> {
    let channel_id = ChannelId::from(cmd.channel_id);

    let schedule = deps
        .schedule_engine
        .generate_schedule(channel_id, Utc::now())
        .await?;

    deps.event_publisher
        .publish(DomainEvent::ScheduleGenerated {
            channel_id,
            schedule_id: schedule.id(),
        })
        .await?;

    Ok(schedule)
}

#[cfg(test)]
#[path = "tests/generate.rs"]
mod tests;