import { readFileSync } from 'node:fs';
import { askTrackedWithImages, askTracked, deterministicSeed } from '@detiq/agents';
import type { LLMConfig } from '@detiq/agents';
import { AppBrain } from '@detiq/app-brain';

export interface FailureContext {
  tenantId?: string;
  error: string;
  stepDescription?: string;
  consoleLogs?: Array<{ type: string; text: string }>;
  networkErrors?: Array<{ url: string; status: number; method: string }>;
  screenshotPath?: string;
}

export async function analyzeFailure(ctx: FailureContext): Promise<string | null> {
  try {
    let llmCfg: LLMConfig | undefined;
    if (ctx.tenantId) {
      llmCfg = await AppBrain.getTaskLLMConfig(ctx.tenantId, 'testRunner').catch(() => undefined) as LLMConfig | undefined ?? undefined;
    }
    if (!llmCfg) return null;

    const consoleSection = ctx.consoleLogs?.length
      ? `\n\nBrowser console (last ${ctx.consoleLogs.length} entries):\n${ctx.consoleLogs.map(l => `[${l.type}] ${l.text}`).join('\n')}`
      : '';

    const networkSection = ctx.networkErrors?.length
      ? `\n\nFailed network requests:\n${ctx.networkErrors.map(n => `${n.method} ${n.url} → ${n.status}`).join('\n')}`
      : '';

    const userText = `A Playwright automated test failed. Identify the root cause in 2-3 sentences. Be specific — name the failing element, API endpoint, or error type. Do not suggest fixes.

Test step: ${ctx.stepDescription ?? 'unknown'}
Error: ${ctx.error}${consoleSection}${networkSection}`;

    if (ctx.screenshotPath) {
      try {
        const img = readFileSync(ctx.screenshotPath);
        const result = await askTrackedWithImages('', userText, [{ base64: img.toString('base64'), mediaType: 'image/png' }], llmCfg);
        return result.text || null;
      } catch { /* fall through to text-only */ }
    }

    const failureSeed = deterministicSeed(`${ctx.tenantId ?? ''}:failure:${(ctx.stepDescription ?? '').slice(0, 100)}:${ctx.error.slice(0, 200)}`);
    const result = await askTracked('', userText, llmCfg, 256, undefined, { temperature: 0, seed: failureSeed });
    return result.text || null;
  } catch {
    return null;
  }
}