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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::issues::Issue;
use crate::service::AppService;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
    /// Issue number (unique within the workspace)
    pub number: i64,
}

#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct TransferIssueParams {
    /// Target workspace name to transfer the issue to
    pub target_workspace_name: String,
}

/// Transfer an issue to another workspace
///
/// Moves an issue from the current workspace to a different workspace.
/// Requires Admin role in both the source and target workspaces.
///
/// Effects:
/// - Issue is transferred to the target workspace with a new number
/// - Source workspace issue count is decremented
/// - Target workspace issue count is incremented
///
/// Returns the transferred issue with updated workspace and number.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/issues/{number}/transfer",
    tag = "Issues",
    operation_id = "issueTransfer",
    params(PathParams),
    request_body(
        content = TransferIssueParams,
        description = "Transfer parameters",
        content_type = "application/json"
    ),
    responses(
        (status = 200, description = "Issue transferred successfully. Returns the issue with new workspace assignment.", body = ApiResponse<Issue>),
        (status = 400, description = "Invalid target workspace", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions in source or target workspace", body = ApiErrorResponse),
        (status = 404, description = "Workspace or issue not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn transfer(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<TransferIssueParams>,
) -> Result<HttpResponse, AppError> {
    let issue = service
        .issue
        .issue_transfer(
            &session,
            &path.workspace_name,
            path.number,
            &params.target_workspace_name,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(issue)))
}