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::UpdateMilestoneParams;
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,
}

/// Update a milestone
///
/// Updates an existing milestone's metadata. Can also close or reopen the milestone via the state field.
/// Requires at least Member role in the repository.
///
/// Updatable fields:
/// - title: Milestone title (optional)
/// - description: Description (optional)
/// - due_at: Target due date (optional)
/// - state: State ("open" or "closed") for closing/reopening the milestone (optional)
///
/// All fields are optional; only provided fields are updated.
/// Returns the updated milestone with full metadata.
#[utoipa::path(
    put,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/issues/milestones/{milestone_id}",
    tag = "Issues",
    operation_id = "issueUpdateMilestone",
    params(PathParams),
    request_body(
        content = UpdateMilestoneParams,
        description = "Milestone update parameters (all fields optional)",
        content_type = "application/json"
    ),
    responses(
        (status = 200, description = "Milestone updated successfully. Returns the updated milestone with full metadata.", body = ApiResponse<IssueMilestone>),
        (status = 400, description = "Invalid parameters", 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, workspace, or milestone not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn update_milestone(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<UpdateMilestoneParams>,
) -> Result<HttpResponse, AppError> {
    let milestone = service
        .issue
        .issue_update_milestone(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.milestone_id,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(milestone)))
}