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::IssueCommentDetail;
use crate::service::AppService;
use crate::service::issues::comments::CreateCommentParams;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    pub workspace_name: String,
    pub number: i64,
}

/// Create a comment on an issue
///
/// Adds a new comment to an issue. Users with read access can comment unless the issue is locked
/// (in which case only users with write access can comment).
///
/// Parameters:
/// - body: Comment body in markdown format (required)
/// - reply_to_comment_id: ID of parent comment for threaded replies (optional)
///
/// Effects:
/// - Comment is created and attached to the issue
/// - Commenter is automatically subscribed to the issue
/// - Issue comment count is incremented
///
/// Returns the created comment with metadata.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/issues/{number}/comments",
    tag = "Issues",
    operation_id = "issueCreateComment",
    params(PathParams),
    request_body(content = CreateCommentParams, description = "Comment creation parameters", content_type = "application/json"),
    responses(
        (status = 201, description = "Comment created successfully.", body = ApiResponse<IssueCommentDetail>),
        (status = 400, description = "Invalid parameters: empty body or issue is locked", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (issue locked and user lacks write access)", body = ApiErrorResponse),
        (status = 404, description = "Workspace or issue not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(("session_cookie" = []))
)]
pub async fn create_comment(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<CreateCommentParams>,
) -> Result<HttpResponse, AppError> {
    let comment = service
        .issue
        .issue_create_comment(
            &session,
            &path.workspace_name,
            path.number,
            params.into_inner(),
        )
        .await?;
    let author_id = comment.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(comment.into_detail(author))))
}