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::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,
}

#[derive(Debug, Deserialize, IntoParams)]
pub struct QueryParams {
    /// Maximum number of milestones to return (default: 50, max: 100)
    pub limit: Option<i64>,
    /// Number of milestones to skip for pagination (default: 0)
    pub offset: Option<i64>,
}

/// List milestones in a repository
///
/// Returns a paginated list of milestones in the repository, sorted by state (open first) then by due date.
/// Includes milestone metadata such as title, description, state, due date, and progress.
/// Requires read access to the repository.
#[utoipa::path(
    get,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/issues/milestones",
    tag = "Issues",
    operation_id = "issueListMilestones",
    params(PathParams, QueryParams),
    responses(
        (status = 200, description = "Milestones listed successfully. Returns array of milestone objects with metadata.", body = ApiResponse<Vec<IssueMilestone>>),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions to access this repository", 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 list_milestones(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    query: web::Query<QueryParams>,
) -> Result<HttpResponse, AppError> {
    let milestones = service
        .issue
        .issue_milestones(
            &session,
            &path.workspace_name,
            &path.repo_name,
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(milestones)))
}