//! 媒体库 Handler — 12 个 HTTP 端点（文件 CRUD + 上传/裁剪/移动 + 文件夹管理）

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

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

use crate::dto::media_dto::{
    BatchDeleteReq, CreateFolderReq, CropReq, FolderResp, MediaItemResp, MediaListParams,
    MoveMediaReq, UpdateFolderReq, UpdateMediaItemReq,
};
use crate::service::media_service;
use crate::state::HealthState;

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

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

// ---------------------------------------------------------------------------
// 媒体文件 CRUD
// ---------------------------------------------------------------------------

/// 分页查询媒体文件列表
pub async fn list_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Query(params): Query<MediaListParams>,
) -> Result<Json<ApiResponse<PaginatedResponse<MediaItemResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.list")?;
    let result = media_service::list_media_items(&state, ctx.tenant_id, params).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 上传媒体文件（multipart/form-data）
pub async fn upload_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    mut multipart: Multipart,
) -> Result<Json<ApiResponse<MediaItemResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;

    let mut file_data = None;
    let mut folder_id: Option<Uuid> = None;
    let mut is_public = false;
    let mut original_name = String::new();
    let mut content_type = String::new();

    while let Some(field) = multipart
        .next_field()
        .await
        .map_err(|e| AppError::Validation(format!("读取上传数据失败: {}", e)))?
    {
        match field.name().unwrap_or("") {
            "file" => {
                original_name = field.file_name().unwrap_or("file").to_string();
                content_type = field
                    .content_type()
                    .unwrap_or("application/octet-stream")
                    .to_string();
                file_data = Some(
                    field
                        .bytes()
                        .await
                        .map_err(|e| AppError::Validation(format!("读取文件数据失败: {}", e)))?,
                );
            }
            "folder_id" => {
                let text = field.text().await.unwrap_or_default();
                folder_id = text.parse().ok();
            }
            "is_public" => {
                let text = field.text().await.unwrap_or_default();
                is_public = text == "true" || text == "1";
            }
            _ => {}
        }
    }

    let data = file_data.ok_or_else(|| AppError::Validation("未找到上传文件".to_string()))?;
    let upload_dir = std::env::var("UPLOAD_DIR").unwrap_or_else(|_| "./uploads".to_string());

    let result = media_service::upload_media(
        &state,
        ctx.tenant_id,
        Some(ctx.user_id),
        &data,
        &original_name,
        &content_type,
        folder_id,
        is_public,
        &upload_dir,
    )
    .await?;

    Ok(Json(ApiResponse::ok(result)))
}

/// 获取单个媒体文件详情
pub async fn get_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
) -> Result<Json<ApiResponse<MediaItemResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.list")?;
    let result = media_service::get_media_item(&state, ctx.tenant_id, id).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 更新媒体文件元数据
pub async fn update_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(mut req): Json<UpdateMediaItemReq>,
) -> Result<Json<ApiResponse<MediaItemResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    req.sanitize();
    let result =
        media_service::update_media_item(&state, ctx.tenant_id, id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 软删除媒体文件
pub async fn delete_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<DeleteVersionReq>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    media_service::delete_media_item(&state, ctx.tenant_id, id, Some(ctx.user_id), req.version)
        .await?;
    Ok(Json(ApiResponse::ok(())))
}

/// 移动媒体文件到指定文件夹
pub async fn move_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<MoveMediaReq>,
) -> Result<Json<ApiResponse<MediaItemResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    let result =
        media_service::move_media(&state, ctx.tenant_id, id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 批量软删除媒体文件
pub async fn batch_delete_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(req): Json<BatchDeleteReq>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    media_service::batch_delete(&state, ctx.tenant_id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(())))
}

/// 裁剪图片并重新生成缩略图
pub async fn crop_media<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<CropReq>,
) -> Result<Json<ApiResponse<MediaItemResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    let result =
        media_service::crop_media(&state, ctx.tenant_id, id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

// ---------------------------------------------------------------------------
// 文件夹管理
// ---------------------------------------------------------------------------

/// 获取文件夹树形结构
pub async fn list_folders<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
) -> Result<Json<ApiResponse<Vec<FolderResp>>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.list")?;
    let result = media_service::list_folders(&state, ctx.tenant_id).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 创建文件夹
pub async fn create_folder<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Json(mut req): Json<CreateFolderReq>,
) -> Result<Json<ApiResponse<FolderResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    req.sanitize();
    let result =
        media_service::create_folder(&state, ctx.tenant_id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 更新文件夹信息
pub async fn update_folder<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(mut req): Json<UpdateFolderReq>,
) -> Result<Json<ApiResponse<FolderResp>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    req.sanitize();
    let result =
        media_service::update_folder(&state, ctx.tenant_id, id, Some(ctx.user_id), req).await?;
    Ok(Json(ApiResponse::ok(result)))
}

/// 删除文件夹（仅空文件夹可删除）
pub async fn delete_folder<S>(
    State(state): State<HealthState>,
    Extension(ctx): Extension<TenantContext>,
    Path(id): Path<Uuid>,
    Json(req): Json<DeleteVersionReq>,
) -> Result<Json<ApiResponse<()>>, AppError>
where
    HealthState: FromRef<S>,
    S: Clone + Send + Sync + 'static,
{
    require_permission(&ctx, "health.media.manage")?;
    media_service::delete_folder(&state, ctx.tenant_id, id, Some(ctx.user_id), req.version).await?;
    Ok(Json(ApiResponse::ok(())))
}