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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::base_info::resolve_users;
use crate::models::workspaces::WorkspaceDetail;
use crate::service::AppService;
use crate::session::Session;

#[derive(Deserialize, Serialize, utoipa::ToSchema)]
pub struct TransferOwnerRequest {
    /// User ID of the new owner, who must be an active member.
    pub new_owner_id: Uuid,
}

#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/transfer-owner",
    tag = "Workspaces",
    operation_id = "workspaceTransferOwner",
    summary = "Transfer workspace ownership",
    description = "Transfer workspace ownership to another active member. The current owner becomes admin.",
    params(
        ("workspace_name" = String, Path, description = "Workspace name.")
    ),
    request_body(
        content = TransferOwnerRequest,
        description = "New owner user ID.",
        content_type = "application/json"
    ),
    responses(
        (status = 200, description = "Ownership transferred.", body = ApiResponse<WorkspaceDetail>),
        (status = 400, description = "New owner must be an active member and different from current owner.", body = ApiErrorResponse),
        (status = 401, description = "Unauthenticated or insufficient role.", body = ApiErrorResponse),
        (status = 500, description = "Database transaction failed.", body = ApiErrorResponse)
    )
)]
pub async fn handle(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<String>,
    params: web::Json<TransferOwnerRequest>,
) -> Result<HttpResponse, AppError> {
    let ws = service.workspace.find_workspace_by_name(&path).await?;
    let data = service
        .workspace
        .workspace_transfer_owner(&session, &ws, params.new_owner_id)
        .await?;

    let db = &service.ctx.db;
    let users = resolve_users(db, &[data.owner_id]).await?;
    let owner = users.get(&data.owner_id).cloned().unwrap_or_default();
    let detail = data.into_detail(owner);

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