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

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

use crate::dto::banner_dto::{
    BannerResp, CreateBannerReq, PublicBannerResp, SortBannerReq, UpdateBannerReq,
};
use crate::service::banner_service;
use crate::state::HealthState;

// ---------------------------------------------------------------------------
// 本地请求结构体
// ---------------------------------------------------------------------------

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

#[derive(Debug, serde::Deserialize)]
pub struct BannerListQuery {
    pub status: Option<String>,
}

#[derive(Debug, serde::Deserialize)]
pub struct PublicBannerQuery {
    pub tenant_id: Option<uuid::Uuid>,
}

// ---------------------------------------------------------------------------
// 管理端端点
// ---------------------------------------------------------------------------

/// GET /health/banners — 列出租户所有轮播图
pub async fn list_banners<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<BannerListQuery>,
) -> Result<Json<ApiResponse<Vec<BannerResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.banners.list")?;
    let result = banner_service::list_banners(&state, ctx.tenant_id, params.status).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// POST /health/banners — 创建轮播图
pub async fn create_banner<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    mut req: Json<CreateBannerReq>,
) -> Result<Json<ApiResponse<BannerResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.banners.manage")?;
    req.sanitize();
    let result = banner_service::create_banner(&state, ctx.tenant_id, ctx.user_id, req.0).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// PUT /health/banners/{id} — 更新轮播图
pub async fn update_banner<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<uuid::Uuid>,
    mut req: Json<UpdateBannerReq>,
) -> Result<Json<ApiResponse<BannerResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.banners.manage")?;
    req.sanitize();
    let result =
        banner_service::update_banner(&state, ctx.tenant_id, id, ctx.user_id, req.0).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// DELETE /health/banners/{id} — 软删除轮播图
pub async fn delete_banner<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<uuid::Uuid>,
    Json(req): Json<DeleteVersionReq>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.banners.manage")?;
    banner_service::delete_banner(&state, ctx.tenant_id, id, ctx.user_id, req.version).await?;
    Ok(Json(ApiResponse::ok(())))
}

/// PUT /health/banners/sort — 批量更新排序
pub async fn sort_banners<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<SortBannerReq>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.banners.manage")?;
    banner_service::sort_banners(&state, ctx.tenant_id, req.items).await?;
    Ok(Json(ApiResponse::ok(())))
}

// ---------------------------------------------------------------------------
// 公开端点（小程序 / 无需认证）
// ---------------------------------------------------------------------------

/// GET /public/banners — 公开轮播图列表
pub async fn list_public_banners<S>(
    State(state): State<HealthState>,
    Query(params): Query<PublicBannerQuery>,
) -> Result<Json<ApiResponse<Vec<PublicBannerResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    let tenant_id = params
        .tenant_id
        .ok_or_else(|| AppError::Validation("缺少 tenant_id".to_string()))?;
    let result = banner_service::list_public_banners(&state, tenant_id).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// GET /public/banner-image/{banner_id} — 公开轮播图图片（无需认证，供小程序下载）
pub async fn serve_banner_image(
    State(state): State<HealthState>,
    Path(banner_id): Path<uuid::Uuid>,
) -> Result<axum::response::Response, AppError> {
    use axum::http::{StatusCode, header};
    use axum::response::IntoResponse;

    let path = banner_service::get_banner_image_path(&state, banner_id).await?;
    let data = tokio::fs::read(&path)
        .await
        .map_err(|e| AppError::Internal(format!("读取图片文件失败: {}", e)))?;

    let mime = if path.ends_with(".png") {
        "image/png"
    } else if path.ends_with(".gif") {
        "image/gif"
    } else if path.ends_with(".webp") {
        "image/webp"
    } else {
        "image/jpeg"
    };

    Ok((
        StatusCode::OK,
        [
            (header::CONTENT_TYPE, mime),
            (header::CACHE_CONTROL, "public, max-age=3600"),
        ],
        data,
    )
        .into_response())
}