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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::base_info::{self, UserBaseInfo};
use crate::models::issues::IssueDetail;
use crate::service::AppService;
use crate::service::issues::core::CreateIssueParams;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    /// Workspace name (unique identifier)
    pub workspace_name: String,
}

/// Create an issue
///
/// Creates a new issue in the specified workspace.
/// Requires at least Member role in the workspace.
///
/// Parameters:
/// - title: Issue title (required)
/// - body: Issue body in markdown (optional)
/// - priority: Priority level (optional, defaults to "none")
/// - visibility: Visibility setting (optional, defaults to "public")
/// - due_at: Due date (optional)
/// - repo_ids: Related repository IDs
/// - label_ids: Label IDs to apply
/// - assignee_ids: User IDs to assign
/// - milestone_id: Milestone ID to attach
///
/// Effects:
/// - Issue is created with auto-incrementing number
/// - Author is automatically subscribed
/// - Relations, labels, and assignees are attached
/// - Workspace stats are updated
///
/// Returns the created issue with full metadata.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/issues",
    tag = "Issues",
    operation_id = "issueCreate",
    params(PathParams),
    request_body(
        content = CreateIssueParams,
        description = "Issue creation parameters",
        content_type = "application/json"
    ),
    responses(
        (status = 201, description = "Issue created successfully. Returns the newly created issue with full metadata.", body = ApiResponse<IssueDetail>),
        (status = 400, description = "Invalid parameters: empty title, invalid repository/label/milestone references", 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 = "Workspace or referenced resource not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn create(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<CreateIssueParams>,
) -> Result<HttpResponse, AppError> {
    let issue = service
        .issue
        .issue_create(&session, &path.workspace_name, params.into_inner())
        .await?;
    let author_id = issue.author_id;
    let users = base_info::resolve_users(&service.ctx.db, &[author_id]).await?;
    let author = users
        .get(&author_id)
        .cloned()
        .unwrap_or_else(|| UserBaseInfo::placeholder(author_id));
    Ok(HttpResponse::Created().json(ApiResponse::new(issue.into_detail(author))))
}