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::IssueMilestone;
use crate::service::AppService;
use crate::service::issues::milestones::CreateMilestoneParams;
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,
}

/// Create a milestone
///
/// Creates a new milestone in a repository for tracking issue progress.
/// Requires at least Member role in the repository.
///
/// Parameters:
/// - title: Milestone title (required)
/// - description: Description of the milestone (optional)
/// - due_at: Target due date (optional)
///
/// Returns the created milestone with metadata.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/issues/milestones",
    tag = "Issues",
    operation_id = "issueCreateMilestone",
    params(PathParams),
    request_body(
        content = CreateMilestoneParams,
        description = "Milestone creation parameters",
        content_type = "application/json"
    ),
    responses(
        (status = 201, description = "Milestone created successfully. Returns the newly created milestone with metadata.", body = ApiResponse<IssueMilestone>),
        (status = 400, description = "Invalid parameters: empty title", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (requires Member role or higher)", body = ApiErrorResponse),
        (status = 404, description = "Repository or workspace not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn create_milestone(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<CreateMilestoneParams>,
) -> Result<HttpResponse, AppError> {
    let milestone = service
        .issue
        .issue_create_milestone(
            &session,
            &path.workspace_name,
            &path.repo_name,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Created().json(ApiResponse::new(milestone)))
}