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

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

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
    /// Repository name (unique within the workspace)
    pub repo_name: String,
    /// Milestone ID (UUID)
    pub milestone_id: uuid::Uuid,
}

/// Delete a milestone
///
/// Permanently removes a milestone from the repository.
/// Requires Admin role in the repository.
///
/// Effects:
/// - Milestone is permanently deleted
/// - Issues attached to this milestone lose their milestone association
///
/// Returns success message on completion.
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/issues/milestones/{milestone_id}",
    tag = "Issues",
    operation_id = "issueDeleteMilestone",
    params(PathParams),
    responses(
        (status = 200, description = "Milestone deleted successfully.", body = ApiResponse<String>),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (requires Admin role)", body = ApiErrorResponse),
        (status = 404, description = "Repository, workspace, or milestone not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn delete_milestone(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
) -> Result<HttpResponse, AppError> {
    service
        .issue
        .issue_delete_milestone(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.milestone_id,
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new("Milestone deleted".to_string())))
}