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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::repos::Repo;
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,
}

use crate::service::repo::fork::ForkRepoParams;

/// Fork a repository
///
/// Creates a copy of the repository in the specified workspace or the current user's workspace.
/// Requires read access to the source repository and write access to the target workspace.
///
/// Effects:
/// - Creates a new repository with all branches, tags, and commit history
/// - Establishes a parent-child relationship between source and fork
/// - Fork is initially set to private visibility
/// - Current user becomes the owner of the fork
///
/// Returns the created fork repository with full metadata.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/fork",
    tag = "Repos",
    operation_id = "repoFork",
    params(PathParams),
    request_body(
        content = ForkRepoParams,
        description = "Fork parameters (all fields optional)",
        content_type = "application/json"
    ),
    responses(
        (status = 201, description = "Repository forked successfully. Returns the newly created fork with full metadata.", body = ApiResponse<Repo>),
        (status = 400, description = "Invalid parameters: target name conflicts or invalid characters", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions to fork or create in target workspace", body = ApiErrorResponse),
        (status = 404, description = "Source repository or target workspace not found", body = ApiErrorResponse),
        (status = 409, description = "Fork with this name already exists in target workspace", body = ApiErrorResponse),
        (status = 500, description = "Internal server error or Git operation failed", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn fork_repo(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<ForkRepoParams>,
) -> Result<HttpResponse, AppError> {
    let repo = service
        .repo
        .repo_fork(
            &session,
            &path.workspace_name,
            &path.repo_name,
            params.into_inner(),
        )
        .await?;

    Ok(HttpResponse::Created().json(ApiResponse::new(repo)))
}