// rxresume-v5.ts
// Future-facing v5/OpenAPI implementation that uses API keys.
// - Kept alongside v4 files so we can swap imports when v5 is ready.
// - Uses RXRESUME_API_KEY and /api/openapi endpoints.
//
// NOTE: Not currently wired in; keep for migration.

import { resumeDataSchema } from "@shared/rxresume-schema";

export interface RxResumeResponse {
  id: string;
  name: string;
  slug: string;
  data: unknown;
  [key: string]: unknown;
}

/**
 * Temporary helper to execute a fetch request with multiple API keys if in development.
 * THIS FUNCTION IS TEMPORARY AND WILL BE REMOVED.
 */

// Cache for last working key index (temporary, part of dev-only logic)
let lastWorkingKeyIndex = 0;

async function executeWithKeyRetries(
  url: string,
  options: RequestInit,
): Promise<unknown> {
  const rawApiKey = process.env.RXRESUME_API_KEY;
  if (!rawApiKey) {
    throw new Error("RXRESUME_API_KEY not configured in environment");
  }

  const isDev = process.env.NODE_ENV !== "production";
  const apiKeys =
    isDev && rawApiKey.includes(",")
      ? rawApiKey.split(",").map((k) => k.trim())
      : [rawApiKey];

  // Start from the last working key index
  for (let attempt = 0; attempt < apiKeys.length; attempt++) {
    const i = (lastWorkingKeyIndex + attempt) % apiKeys.length;
    const apiKey = apiKeys[i];
    const headers = {
      "x-api-key": apiKey,
      ...(options.body ? { "Content-Type": "application/json" } : {}),
      ...(options.headers || {}),
    } as Record<string, string>;

    const response = await fetch(url, {
      ...options,
      headers,
    });

    if (!response.ok) {
      const errorData = (await response
        .json()
        .catch(() => ({ message: response.statusText }))) as {
        message?: string;
      };
      const errorMsg = `Reactive Resume API error (${response.status}): ${errorData.message || response.statusText}`;

      // ONLY retry/rotation on 401 Unauthorized
      if (
        response.status === 401 &&
        apiKeys.length > 1 &&
        attempt < apiKeys.length - 1
      ) {
        console.warn(
          `[RxResume SDK] Key index ${i} was Unauthorized, trying next key...`,
        );
        continue;
      }

      throw new Error(errorMsg);
    }

    // Success! Cache this key index for future requests
    lastWorkingKeyIndex = i;

    const contentType = response.headers.get("content-type");
    if (contentType?.includes("application/json")) {
      return response.json();
    }
    return response.text();
  }

  // Unmissable error block if all keys fail
  if (apiKeys.length > 1) {
    console.error(`
################################################################################
#                                                                              #
#   ❌ ALL REACTIVE RESUME API KEYS FAILED (${apiKeys.length} keys attempted)               #
#   Please check your .env configuration.                                      #
#                                                                              #
################################################################################
`);
  }

  throw new Error("All Reactive Resume API keys failed.");
}

/**
 * Generic fetch helper for Reactive Resume API
 */
export async function fetchRxResume(
  path: string,
  options: RequestInit = {},
): Promise<unknown> {
  const baseUrl = process.env.RXRESUME_URL || "https://rxresu.me";
  let cleanBaseUrl = baseUrl.endsWith("/") ? baseUrl.slice(0, -1) : baseUrl;

  // Handle cases where the base URL already includes /api or /api/openapi
  if (cleanBaseUrl.endsWith("/api/openapi")) {
    cleanBaseUrl = cleanBaseUrl.slice(0, -12);
  } else if (cleanBaseUrl.endsWith("/api")) {
    cleanBaseUrl = cleanBaseUrl.slice(0, -4);
  }

  const url = `${cleanBaseUrl}/api/openapi${path}`;
  return executeWithKeyRetries(url, options);
}

/**
 * Fetch a resume by its ID.
 */
export async function getResume(id: string): Promise<RxResumeResponse> {
  return (await fetchRxResume(`/resume/${id}`)) as RxResumeResponse;
}

/**
 * Import a resume.
 */
export async function importResume(payload: {
  name: string;
  slug: string;
  data: unknown;
}): Promise<string> {
  // Validate data against schema before sending
  try {
    payload.data = resumeDataSchema.parse(payload.data);
  } catch (error) {
    console.error("❌ Resume data validation failed:", error);
    throw error;
  }

  // DEBUG: Save payload to file for debugging (temporary)
  try {
    const fs = await import("node:fs/promises");
    const path = await import("node:path");
    const debugDir = path.join(process.cwd(), "debug");
    await fs.mkdir(debugDir, { recursive: true });
    const timestamp = new Date().toISOString().replace(/[:.]/g, "-");
    const filename = path.join(debugDir, `rxresume-import-${timestamp}.json`);
    await fs.writeFile(filename, JSON.stringify(payload, null, 2), "utf-8");
    console.log(`📝 DEBUG: Saved import payload to ${filename}`);
  } catch (debugErr) {
    console.warn("⚠️ Could not save debug file:", debugErr);
  }

  const result = (await fetchRxResume("/resume/import", {
    method: "POST",
    body: JSON.stringify(payload),
  })) as { id: string } | string;

  // Reactive Resume returns the full resume object on import in v4+, or just ID in v5.
  return typeof result === "string" ? result : result.id;
}

/**
 * Delete a resume.
 */
export async function deleteResume(id: string): Promise<void> {
  await fetchRxResume(`/resume/${id}`, { method: "DELETE" });
}

/**
 * Export a resume as PDF. Returns the URL.
 */
export async function exportResumePdf(id: string): Promise<string> {
  const result = (await fetchRxResume(`/printer/resume/${id}/pdf`)) as {
    url: string;
  };
  return result.url;
}

/**
 * List all resumes.
 * According to official OpenAPI spec, the endpoint is /resume/list
 */
export async function listResumes(): Promise<{ id: string; name: string }[]> {
  return (await fetchRxResume("/resume/list")) as {
    id: string;
    name: string;
  }[];
}