import { z } from 'zod';

const checksum = z
    .string()
    .regex(/^[a-f0-9]{64}$/, '必须是 SHA-256 十六进制摘要');
export const createMediaUploadIntentRequestSchema = z
    .object({
        purpose: z.literal('watermark_image'),
        filename: z.string().trim().min(1).max(255),
        content_type: z.enum(['image/png', 'image/jpeg', 'image/webp']),
        byte_size: z
            .number()
            .int()
            .min(1)
            .max(5 * 1024 * 1024),
        checksum_sha256: checksum,
    })
    .strict();
export const completeMediaUploadIntentRequestSchema = z
    .object({
        checksum_sha256: checksum,
    })
    .strict();
export const createMediaAccessUrlRequestSchema = z
    .object({
        purpose: z.literal('preview'),
    })
    .strict();

export type CreateMediaUploadIntentRequest = z.infer<
    typeof createMediaUploadIntentRequestSchema
>;
export type CompleteMediaUploadIntentRequest = z.infer<
    typeof completeMediaUploadIntentRequestSchema
>;

// ── 只读响应类型（由前端 AI 按 docs/api/watermarks-and-assets.md §1 补充，后端请复核） ──

/** 预签名直传端点：前端必须按返回的 method/url/headers 原样上传 */
export type MediaUploadEndpoint = {
    method: string;
    url: string;
    headers: Record<string, string>;
};

/** POST /api/media/upload-intents 响应 */
export type MediaUploadIntent = {
    upload_id: string;
    expires_at: string;
    upload: MediaUploadEndpoint;
};

/** 校验通过后创建/复用的素材 */
export type MediaAsset = {
    id: string;
    content_type: string;
    byte_size: number;
    width_px: number | null;
    height_px: number | null;
    created_at: string;
};

/** POST /api/media-assets/{asset_id}/access-urls 响应（短时预览 URL） */
export type MediaAccessUrl = {
    url: string;
    expires_at: string;
};