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

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::service::im::channels::ChannelListFilters;
use crate::session::Session;

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

#[derive(Debug, Deserialize, IntoParams)]
pub struct QueryParams {
    pub channel_type: Option<String>,
    pub channel_kind: Option<String>,
    pub category_id: Option<uuid::Uuid>,
    pub archived: Option<bool>,
    pub limit: Option<i64>,
    pub offset: Option<i64>,
}

/// List channels
#[utoipa::path(
    get,
    path = "/api/v1/im/workspaces/{workspace_name}/channels",
    tag = "IM",
    operation_id = "imChannelList",
    params(PathParams, QueryParams),
    responses(
        (status = 200, description = "Channels listed successfully", body = ApiResponse<Vec<ChannelDetail>>),
        (status = 401, description = "Authentication required", body = ApiErrorResponse),
        (status = 404, description = "Workspace not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn channel_list(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    query: web::Query<QueryParams>,
) -> Result<HttpResponse, AppError> {
    let user_id = session.user().ok_or(AppError::Unauthorized)?;
    let im_session = ImSession::new(user_id);
    let filters = ChannelListFilters {
        channel_type: query.channel_type.clone(),
        channel_kind: query.channel_kind.clone(),
        category_id: query.category_id,
        archived: query.archived,
    };
    let result = service
        .im
        .channel_list(
            &im_session,
            &path.workspace_name,
            filters,
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;

    let db = &service.ctx.db;
    let creator_ids: Vec<Uuid> = result.iter().map(|c| c.created_by).collect();
    let users = resolve_users(db, &creator_ids).await?;
    let details: Vec<ChannelDetail> = result
        .into_iter()
        .map(|c| {
            let creator = users.get(&c.created_by).cloned().unwrap_or_default();
            c.into_detail(creator)
        })
        .collect();

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