use std::sync::Arc;

use domain::testing::{InMemoryChannelRepository, NoopEventPublisher};
use domain::value_objects::{ChannelId, UserId};
use domain::DomainError;

use crate::channels::commands::{CreateChannelCommand, UpdateChannelCommand};
use crate::channels::deps::ChannelCommandDeps;
use crate::channels::{create, update};

fn make_deps() -> (ChannelCommandDeps, Arc<InMemoryChannelRepository>) {
    let repo = Arc::new(InMemoryChannelRepository::new());
    let deps = ChannelCommandDeps {
        channel_command: repo.clone(),
        channel_query: repo.clone(),
        event_publisher: Arc::new(NoopEventPublisher::new()),
    };
    (deps, repo)
}

#[tokio::test]
async fn updates_channel_name() {
    let (deps, _) = make_deps();
    let owner = UserId::generate();

    let channel = create::execute(
        &deps,
        CreateChannelCommand {
            owner_id: owner,
            name: "Original".into(),
            timezone: "UTC".into(),
        },
    )
    .await
    .unwrap();

    let updated = update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: owner,
            name: Some("Renamed".into()),
            description: None,
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await
    .unwrap();

    assert_eq!(updated.name(), "Renamed");
    assert_eq!(updated.timezone(), "UTC"); // unchanged
}

#[tokio::test]
async fn update_fails_if_not_owner() {
    let (deps, _) = make_deps();
    let owner = UserId::generate();
    let stranger = UserId::generate();

    let channel = create::execute(
        &deps,
        CreateChannelCommand {
            owner_id: owner,
            name: "Protected".into(),
            timezone: "UTC".into(),
        },
    )
    .await
    .unwrap();

    let result = update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: stranger,
            name: Some("Hacked".into()),
            description: None,
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await;

    assert!(result.is_err());
    match result.unwrap_err() {
        DomainError::Forbidden(_) => {}
        other => panic!("expected Forbidden, got: {:?}", other),
    }
}

#[tokio::test]
async fn update_nonexistent_channel_returns_not_found() {
    let (deps, _) = make_deps();

    let result = update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: ChannelId::generate(),
            owner_id: UserId::generate(),
            name: Some("Ghost".into()),
            description: None,
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await;

    assert!(result.is_err());
    assert!(matches!(
        result.unwrap_err(),
        DomainError::ChannelNotFound(_)
    ));
}

#[tokio::test]
async fn update_config_creates_snapshot() {
    let (deps, repo) = make_deps();
    let owner = UserId::generate();

    let channel = create::execute(
        &deps,
        CreateChannelCommand {
            owner_id: owner,
            name: "Snapshotted".into(),
            timezone: "UTC".into(),
        },
    )
    .await
    .unwrap();

    // Update with new schedule_config
    let new_config = domain::models::ScheduleConfig::default();
    update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: owner,
            name: None,
            description: None,
            timezone: None,
            schedule_config: Some(new_config),
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await
    .unwrap();

    // Verify a config snapshot was created
    let snapshots = repo.snapshots.lock().unwrap();
    assert_eq!(snapshots.len(), 1);
    assert_eq!(snapshots[0].channel_id(), channel.id());
}

#[tokio::test]
async fn update_without_config_skips_snapshot() {
    let (deps, repo) = make_deps();
    let owner = UserId::generate();

    let channel = create::execute(
        &deps,
        CreateChannelCommand {
            owner_id: owner,
            name: "NoSnapshot".into(),
            timezone: "UTC".into(),
        },
    )
    .await
    .unwrap();

    // Update name only — no config change
    update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: owner,
            name: Some("Renamed".into()),
            description: None,
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await
    .unwrap();

    // No snapshot should exist
    let snapshots = repo.snapshots.lock().unwrap();
    assert!(snapshots.is_empty());
}

#[tokio::test]
async fn update_description_clear() {
    let (deps, _) = make_deps();
    let owner = UserId::generate();

    let channel = create::execute(
        &deps,
        CreateChannelCommand {
            owner_id: owner,
            name: "Desc Test".into(),
            timezone: "UTC".into(),
        },
    )
    .await
    .unwrap();

    // Set description
    let updated = update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: owner,
            name: None,
            description: Some(Some("A description".into())),
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await
    .unwrap();
    assert_eq!(updated.description(), Some("A description"));

    // Clear description with Some(None)
    let cleared = update::execute(
        &deps,
        UpdateChannelCommand {
            channel_id: channel.id(),
            owner_id: owner,
            name: None,
            description: Some(None),
            timezone: None,
            schedule_config: None,
            rotation_policy: None,
            auto_schedule: None,
            gap_filler: None,
        },
    )
    .await
    .unwrap();
    assert!(cleared.description().is_none());
}