use axum::extract::{FromRef, Path, Query, State};
use axum::response::IntoResponse;
use axum::Extension;
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::dto::alert_dto::{CreateAlertRuleRequest, UpdateAlertRuleRequest};
use crate::service::alert_rule_service;
use crate::state::HealthState;

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

#[derive(Debug, Deserialize)]
pub struct DeactivateRequest {
    pub version: i32,
}

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

    let (items, total) = alert_rule_service::list_rules(
        &state, ctx.tenant_id, query.device_type.as_deref(), page, page_size,
    ).await?;

    Ok(axum::Json(ApiResponse::ok(PaginatedResponse {
        data: items,
        total,
        page,
        page_size,
        total_pages: total.div_ceil(page_size.max(1)),
    })))
}

pub async fn create<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    axum::Json(mut body): axum::Json<CreateAlertRuleRequest>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.alert-rules.manage")?;
    body.sanitize();
    let rule = alert_rule_service::create_rule(
        &state, ctx.tenant_id, ctx.user_id, body,
    ).await?;
    Ok(axum::Json(ApiResponse::ok(rule)))
}

pub async fn update<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    axum::Json(mut body): axum::Json<UpdateAlertRuleRequest>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.alert-rules.manage")?;
    body.sanitize();
    let rule = alert_rule_service::update_rule(
        &state, ctx.tenant_id, id, ctx.user_id, body,
    ).await?;
    Ok(axum::Json(ApiResponse::ok(rule)))
}

pub async fn deactivate<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    axum::Json(body): axum::Json<DeactivateRequest>,
) -> Result<impl IntoResponse, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.alert-rules.manage")?;
    let rule = alert_rule_service::deactivate_rule(
        &state, ctx.tenant_id, id, body.version,
    ).await?;
    Ok(axum::Json(ApiResponse::ok(rule)))
}