const DEFAULT_BASE_URL = "http://localhost:3000";

function normalizeBaseUrl(value) {
  const normalized = String(value || DEFAULT_BASE_URL).trim().replace(/\/+$/, "");
  const parsed = new URL(normalized);
  if (!/^https?:$/.test(parsed.protocol)) {
    throw new Error("YEDIR_BASE_URL must use http or https");
  }
  return parsed.toString().replace(/\/+$/, "");
}

function readConfig(overrides = {}) {
  const baseUrl = normalizeBaseUrl(
    overrides.baseUrl || process.env.YEDIR_BASE_URL || DEFAULT_BASE_URL
  );
  const accessToken = String(
    overrides.accessToken || process.env.YEDIR_ACCESS_TOKEN || ""
  ).trim();
  if (!accessToken) {
    throw new Error("YEDIR_ACCESS_TOKEN is required");
  }
  return { baseUrl, accessToken };
}

export class YedirApiError extends Error {
  constructor(message, status, payload) {
    super(message);
    this.name = "YedirApiError";
    this.status = status;
    this.payload = payload;
  }
}

export async function yedirRequest(path, options = {}, overrides = {}) {
  const { baseUrl, accessToken } = readConfig(overrides);
  const response = await fetch(`${baseUrl}${path}`, {
    ...options,
    headers: {
      Accept: "application/json",
      Authorization: `Bearer ${accessToken}`,
      ...(options.body ? { "Content-Type": "application/json" } : {}),
      ...(options.headers || {}),
    },
  });
  const payload = await response.json().catch(() => null);
  if (!response.ok) {
    throw new YedirApiError(
      String(payload?.error || `Yedir API request failed (${response.status})`),
      response.status,
      payload
    );
  }
  return payload;
}

export function getCurrentUser(overrides) {
  return yedirRequest("/api/openapi/v1/me", {}, overrides);
}

export function listCanvases(
  { workspaceType = "canvas", limit = 24 } = {},
  overrides = {}
) {
  const params = new URLSearchParams({
    workspaceType,
    limit: String(limit),
  });
  return yedirRequest(`/api/openapi/v1/canvases?${params}`, {}, overrides);
}

export function getCanvas(canvasId, overrides) {
  return yedirRequest(
    `/api/openapi/v1/canvases/${encodeURIComponent(canvasId)}`,
    {},
    overrides
  );
}

export function applyCanvasOperation(canvasId, operationPlan, overrides) {
  return yedirRequest(
    `/api/openapi/v1/canvases/${encodeURIComponent(canvasId)}/operations`,
    {
      method: "POST",
      body: JSON.stringify({ operationPlan }),
    },
    overrides
  );
}