import "server-only";

import type { TripoApiEnvelope, TripoProviderConfig } from "./types";

const DEFAULT_TRIPO_BASE_URL = "https://api.tripo3d.ai/v2/openapi";

type TripoRequestOptions = {
  method?: "GET" | "POST";
  path: string;
  json?: Record<string, unknown>;
  formData?: FormData;
  headers?: Record<string, string>;
};

export class TripoApiError extends Error {
  code: number | null;
  suggestion: string | null;
  httpStatus: number;
  traceId: string | null;
  payload: unknown;

  constructor(params: {
    message: string;
    code?: number | null;
    suggestion?: string | null;
    httpStatus: number;
    traceId?: string | null;
    payload?: unknown;
  }) {
    super(params.message);
    this.name = "TripoApiError";
    this.code = params.code ?? null;
    this.suggestion = params.suggestion ?? null;
    this.httpStatus = params.httpStatus;
    this.traceId = params.traceId ?? null;
    this.payload = params.payload;
  }
}

function normalizeBaseUrl(baseUrl?: string) {
  const resolved = String(baseUrl || "").trim() || DEFAULT_TRIPO_BASE_URL;
  return resolved.replace(/\/+$/, "");
}

function sanitizeHeaderText(value: string): string {
  return String(value || "")
    .replace(/[\u2028\u2029]/g, "")
    .replace(/[\u0000-\u001F\u007F]/g, "")
    .trim();
}

function hasNonByteStringChar(value: string): boolean {
  for (let i = 0; i < value.length; i += 1) {
    if (value.charCodeAt(i) > 255) return true;
  }
  return false;
}

async function parseResponseBody(response: Response): Promise<unknown> {
  const contentType = response.headers.get("content-type") || "";
  if (contentType.includes("application/json")) {
    return response.json().catch(() => null);
  }
  const text = await response.text().catch(() => "");
  return text || null;
}

export async function tripoRequest<T = unknown>(
  config: TripoProviderConfig,
  options: TripoRequestOptions
): Promise<{ data: T; traceId: string | null; raw: TripoApiEnvelope<T> | unknown }> {
  const method = options.method || "GET";
  const path = options.path.startsWith("/") ? options.path : `/${options.path}`;
  const url = `${normalizeBaseUrl(config.baseUrl)}${path}`;
  const headers = new Headers(options.headers || {});

  const normalizedApiKey = sanitizeHeaderText(String(config.apiKey || "")).replace(/\s+/g, "");
  if (!normalizedApiKey) {
    throw new TripoApiError({
      message: "Tripo3D API Key 为空，请在本地AI设置中重新保存",
      httpStatus: 400,
    });
  }
  if (hasNonByteStringChar(normalizedApiKey)) {
    throw new TripoApiError({
      message:
        "Tripo3D API Key 含非法字符（可能是复制时带入的隐藏换行符），请在本地AI设置中重新粘贴保存",
      httpStatus: 400,
    });
  }

  headers.set("Authorization", `Bearer ${normalizedApiKey}`);
  headers.set("Accept", "application/json");

  let body: BodyInit | undefined;
  if (options.formData) {
    body = options.formData;
  } else if (options.json) {
    headers.set("Content-Type", "application/json");
    body = JSON.stringify(options.json);
  }

  const response = await fetch(url, {
    method,
    headers,
    body,
  });
  const traceId = response.headers.get("x-tripo-trace-id");
  const parsed = await parseResponseBody(response);

  const envelope =
    parsed && typeof parsed === "object" && "code" in (parsed as Record<string, unknown>)
      ? (parsed as TripoApiEnvelope<T>)
      : null;

  if (!response.ok) {
    const message =
      envelope?.message ||
      (typeof parsed === "string" ? parsed : `Tripo 请求失败（HTTP ${response.status}）`);
    throw new TripoApiError({
      message,
      code: envelope?.code ?? null,
      suggestion: envelope?.suggestion ?? null,
      httpStatus: response.status,
      traceId,
      payload: parsed,
    });
  }

  if (!envelope) {
    throw new TripoApiError({
      message: "Tripo 响应格式异常",
      httpStatus: response.status,
      traceId,
      payload: parsed,
    });
  }

  if (envelope.code !== 0) {
    throw new TripoApiError({
      message: envelope.message || "Tripo 请求失败",
      code: envelope.code,
      suggestion: envelope.suggestion || null,
      httpStatus: response.status,
      traceId,
      payload: envelope,
    });
  }

  return {
    data: envelope.data,
    traceId,
    raw: envelope,
  };
}

export function pickTaskModelUrl(output?: Record<string, unknown> | null): string | null {
  if (!output) return null;
  const candidates = [
    output.pbr_model,
    output.model,
    output.base_model,
    output.rigged_model,
    output.animated_model,
    output.low_poly_model,
    output.result_model,
    output.glb,
    output.fbx,
    output.usdz,
    output.obj,
    output.stl,
  ];
  for (const item of candidates) {
    if (typeof item === "string") {
      const value = item.trim();
      if (value) return value;
      continue;
    }
    if (item && typeof item === "object") {
      const nested =
        typeof (item as Record<string, unknown>).url === "string"
          ? String((item as Record<string, unknown>).url).trim()
          : "";
      if (nested) return nested;
    }
  }
  return null;
}

export function pickTaskPreviewImageUrl(output?: Record<string, unknown> | null): string | null {
  if (!output) return null;
  const candidates = [
    output.generated_image,
    output.rendered_image,
    output.preview_image,
    output.thumbnail,
  ];
  for (const item of candidates) {
    const value = typeof item === "string" ? item.trim() : "";
    if (value) return value;
  }
  return null;
}