use axum::Extension;
use axum::extract::{FromRef, Path, Query, State};
use axum::response::IntoResponse;
use serde::Deserialize;
use utoipa::IntoParams;
use uuid::Uuid;

use erp_core::error::AppError;
use erp_core::rbac::require_permission;
use erp_core::types::{ApiResponse, PaginatedResponse, TenantContext};

use crate::service::critical_alert_service;
use crate::state::HealthState;

#[derive(Debug, Deserialize, IntoParams)]
pub struct CriticalAlertListQuery {
    pub page: Option<u64>,
    pub page_size: Option<u64>,
}

pub async fn list_critical_alerts<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Query(query): Query<CriticalAlertListQuery>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.critical-alerts.list")?;
    let page = query.page.unwrap_or(1);
    let page_size = query.page_size.unwrap_or(20).min(100);

    let (items, total) =
        critical_alert_service::list_pending_alerts(&state, ctx.tenant_id, page, page_size)
            .await
            .map_err(|e| {
                tracing::error!(error = %e, tenant_id = %ctx.tenant_id, "查询危急值告警列表失败");
                e
            })?;

    let total_pages = if page_size > 0 {
        total.div_ceil(page_size)
    } else {
        0
    };

    Ok(axum::Json(ApiResponse::ok(PaginatedResponse {
        data: items,
        total,
        page,
        page_size,
        total_pages,
    })))
}

pub async fn get_critical_alert<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.critical-alerts.list")?;
    let alert = critical_alert_service::get_alert(&state, ctx.tenant_id, id).await?;
    Ok(axum::Json(ApiResponse::ok(alert)))
}

#[derive(Debug, serde::Deserialize, utoipa::ToSchema)]
pub struct AcknowledgeCriticalAlertRequest {
    pub notes: Option<String>,
}

pub async fn acknowledge_critical_alert<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    axum::Json(body): axum::Json<AcknowledgeCriticalAlertRequest>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.critical-alerts.manage")?;
    critical_alert_service::acknowledge_alert(&state, ctx.tenant_id, id, ctx.user_id, body.notes)
        .await?;
    Ok(axum::Json(ApiResponse::ok(
        serde_json::json!({"message": "告警已确认"}),
    )))
}