use axum::extract::{Extension, Query, State};
use axum::extract::FromRef;
use axum::Json;
use serde::Deserialize;

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

use crate::dto::{CreateTemplateReq, MessageTemplateResp};
use crate::message_state::MessageState;
use crate::service::template_service::TemplateService;

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

/// 查询消息模板列表。
pub async fn list_templates<S>(
    State(_state): State<MessageState>,
    Extension(ctx): Extension<TenantContext>,
    Query(query): Query<TemplateQuery>,
) -> Result<Json<ApiResponse<PaginatedResponse<MessageTemplateResp>>>, AppError>
where
    MessageState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "message:template:list")?;

    let page = query.page.unwrap_or(1);
    let page_size = query.page_size.unwrap_or(20);

    let (templates, total) =
        TemplateService::list(ctx.tenant_id, page, page_size, &_state.db).await?;

    let total_pages = (total + page_size - 1) / page_size;
    Ok(Json(ApiResponse::ok(PaginatedResponse {
        data: templates,
        total,
        page,
        page_size,
        total_pages,
    })))
}

/// 创建消息模板。
pub async fn create_template<S>(
    State(_state): State<MessageState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<CreateTemplateReq>,
) -> Result<Json<ApiResponse<MessageTemplateResp>>, AppError>
where
    MessageState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "message:template:create")?;

    req.validate()
        .map_err(|e| AppError::Validation(e.to_string()))?;

    let resp = TemplateService::create(ctx.tenant_id, ctx.user_id, &req, &_state.db).await?;
    Ok(Json(ApiResponse::ok(resp)))
}