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

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, UpdateTemplateReq};
use crate::message_state::MessageState;
use crate::service::template_service::TemplateService;

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

#[utoipa::path(
    get,
    path = "/api/v1/message-templates",
    params(TemplateQuery),
    responses(
        (status = 200, description = "成功", body = ApiResponse<PaginatedResponse<MessageTemplateResp>>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "消息模板"
)]
/// 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).max(1);
    let page_size = query.page_size.unwrap_or(20).max(1);

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

    let total_pages = total.div_ceil(page_size);
    Ok(Json(ApiResponse::ok(PaginatedResponse {
        data: templates,
        total,
        page,
        page_size,
        total_pages,
    })))
}

#[utoipa::path(
    post,
    path = "/api/v1/message-templates",
    request_body = CreateTemplateReq,
    responses(
        (status = 200, description = "成功", body = ApiResponse<MessageTemplateResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "消息模板"
)]
/// 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)))
}

#[utoipa::path(
    put,
    path = "/api/v1/message-templates/{id}",
    request_body = UpdateTemplateReq,
    responses(
        (status = 200, description = "成功", body = ApiResponse<MessageTemplateResp>),
        (status = 401, description = "未授权"),
        (status = 403, description = "权限不足"),
    ),
    security(("bearer_auth" = [])),
    tag = "消息模板"
)]
/// 更新消息模板。
pub async fn update_template<S>(
    State(_state): State<MessageState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<UpdateTemplateReq>,
) -> Result<Json<ApiResponse<MessageTemplateResp>>, AppError>
where
    MessageState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "message.template.manage")?;

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

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

/// 删除消息模板。
#[allow(clippy::type_complexity)]
pub async fn delete_template<S>(
    State(_state): State<MessageState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    MessageState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "message.template.manage")?;

    TemplateService::delete(id, ctx.tenant_id, ctx.user_id, &_state.db).await?;
    Ok(Json(ApiResponse::ok(())))
}