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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::prs::PullRequest;
use crate::service::AppService;
use crate::service::pr::core::UpdatePrParams;
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,
    /// PR number (unique within the repository)
    pub number: i64,
}

/// Update a pull request
///
/// Updates an existing pull request's metadata such as title, body, target branch, and draft status.
/// Requires write access to the PR (author or repository member).
///
/// All fields are optional; only provided fields are updated.
/// Returns the updated PR with full metadata.
#[utoipa::path(
    put,
    path = "/api/v1/workspaces/{workspace_name}/repos/{repo_name}/prs/{number}",
    tag = "Pull Requests",
    operation_id = "prUpdate",
    params(PathParams),
    request_body(
        content = UpdatePrParams,
        description = "PR update parameters (all fields optional)",
        content_type = "application/json"
    ),
    responses(
        (status = 200, description = "PR updated successfully. Returns the updated PR with full metadata.", body = ApiResponse<PullRequest>),
        (status = 400, description = "Invalid parameters", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 403, description = "Insufficient permissions to edit this PR", body = ApiErrorResponse),
        (status = 404, description = "Repository, workspace, or PR not found", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn update(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
    params: web::Json<UpdatePrParams>,
) -> Result<HttpResponse, AppError> {
    let pr = service
        .pr
        .pr_update(
            &session,
            &path.workspace_name,
            &path.repo_name,
            path.number,
            params.into_inner(),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(pr)))
}