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

use crate::api::response::{ApiResponse, ApiErrorResponse};
use crate::error::AppError;
use crate::models::repos::RepoBranch;
use crate::service::repo::branches::CreateBranchParams;
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,
}

/// Create a new branch
///
/// Creates a new branch in the repository based on an existing commit or branch.
/// Requires Write role or higher in the repository.
/// 
/// Parameters:
/// - name: Branch name (1-100 characters, alphanumeric, hyphens, underscores, dots, slashes allowed)
/// - from: Source branch name or commit SHA to branch from (defaults to default branch)
/// 
/// Returns the created branch with metadata including the initial commit SHA.
#[utoipa::path(
    post,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/branches",
    tag = "Repos",
    operation_id = "repoCreateBranch",
    params(PathParams),
    request_body(
        content = CreateBranchParams,
        description = "Branch creation parameters",
        content_type = "application/json"
    ),
    responses(
        (status = 201, description = "Branch created successfully. Returns the newly created branch with metadata.", body = ApiResponse<RepoBranch>),
        (status = 400, description = "Invalid parameters: name too long, invalid characters, or source branch/commit doesn't exist", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions (requires Write role or higher)", body = ApiErrorResponse),
        (status = 404, description = "Repository, workspace, or source branch/commit not found", body = ApiErrorResponse),
        (status = 409, description = "Branch with this name already exists", body = ApiErrorResponse),
        (status = 500, description = "Internal server error or Git operation failed", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn create_branch(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<CreateBranchParams>,
) -> Result<HttpResponse, AppError> {
    let branch = service
        .repo
        .repo_create_branch(&session, &path.workspace_name, &path.repo_name, params.into_inner())
        .await?;

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