use actix_web::{HttpResponse, web};
use serde::Deserialize;
use utoipa::IntoParams;

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::base_info::resolve_users;
use crate::models::channels::ChannelDetail;
use crate::service::AppService;
use crate::service::im::ImSession;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    pub workspace_name: String,
    pub channel_id: uuid::Uuid,
}

/// Get a channel
#[utoipa::path(
    get,
    path = "/api/v1/im/workspaces/{workspace_name}/channels/{channel_id}",
    tag = "IM",
    operation_id = "imChannelGet",
    params(PathParams),
    responses(
        (status = 200, description = "Channel retrieved successfully", body = ApiResponse<ChannelDetail>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "Workspace or channel not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn channel_get(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
) -> Result<HttpResponse, AppError> {
    let user_id = session.user().ok_or(AppError::Unauthorized)?;
    let im_session = ImSession::new(user_id);
    let channel = service
        .im
        .channel_get(&im_session, &path.workspace_name, path.channel_id)
        .await?;

    let db = &service.ctx.db;
    let users = resolve_users(db, &[channel.created_by]).await?;
    let creator = users.get(&channel.created_by).cloned().unwrap_or_default();
    let detail = channel.into_detail(creator);

    Ok(HttpResponse::Ok().json(ApiResponse::new(detail)))
}