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,
    /// Branch ID (UUID)
    pub branch_id: uuid::Uuid,
}

/// Delete a branch
///
/// Permanently deletes a branch from the repository. The default branch cannot be deleted.
/// Requires Write role or higher in the repository.
///
/// Effects:
/// - Branch is permanently removed from the repository
/// - All commits exclusive to this branch remain accessible via their SHA
/// - Open pull requests targeting this branch will be closed
///
/// Returns success message on completion.
#[utoipa::path(
    delete,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/branches/{branch_id}",
    tag = "Repos",
    operation_id = "repoDeleteBranch",
    params(PathParams),
    responses(
        (status = 200, description = "Branch deleted successfully.", body = ApiResponse<String>),
        (status = 400, description = "Cannot delete the default branch", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (requires Write role or higher)", body = ApiErrorResponse),
        (status = 404, description = "Repository, workspace, or branch not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error or Git operation failed", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn delete_branch(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
) -> Result<HttpResponse, AppError> {
    service
        .repo
        .repo_delete_branch(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.branch_id,
        )
        .await?;

    Ok(HttpResponse::Ok().json(ApiResponse::new("Branch deleted successfully".to_string())))
}