/**
 * Lyra Memory Extraction — interne Funktion (ohne HTTP-Roundtrip).
 *
 * Wird von sos-stream.get.ts fire-and-forget nach Stream-Ende aufgerufen.
 * Fehler sind immer silent — darf NIE die User-Experience beeinflussen.
 */
import { upsertMemory } from "../db/lyraMemory";
import type { LyraMemoryType } from "../db/lyraMemory";

const VALID_TYPES: LyraMemoryType[] = [
  "trigger",
  "habit",
  "strength",
  "relationship",
  "milestone",
  "pain_point",
  "goal",
  "preference",
];

const EXTRACTION_SYSTEM_PROMPT = `Du extrahierst aus einem Gespräch zwischen User und Lyra-Coach strukturierte Fakten über den User. Output strikt als JSON-Array:
[{"type":"trigger|habit|strength|relationship|milestone|pain_point|goal|preference", "content":"<kurzer Fakt, max 200 chars>", "confidence":0.0-1.0}]
Regeln:
- Nur Fakten die der USER explizit oder implizit über sich geteilt hat. Nichts erfinden.
- Keine Vermutungen über Diagnosen oder Pathologisierungen ("süchtig", "krank" etc).
- Nur Wesentliches. Wenn nichts Neues drin ist → leeres Array [].
- confidence: 0.9+ wenn User explizit gesagt, 0.5-0.7 wenn implizit, <0.5 garnicht extrahieren.
- content in der Sprache des Gesprächs (DE).
- Maximal 8 Einträge pro Extraktion.`;

export async function extractAndStoreMemories(
  userId: string,
  conversation: Array<{ role: string; content: string }>,
  sessionId?: string,
  openrouterKey?: string,
): Promise<void> {
  if (!openrouterKey) {
    console.warn("[lyra-memory] extract: no OpenRouter key");
    return;
  }

  const userMessages = conversation.filter((m) => m.role === "user");
  if (userMessages.length === 0) return;

  const conversationText = conversation
    .slice(-20)
    .map((m) => `${m.role === "user" ? "User" : "Lyra"}: ${m.content}`)
    .join("\n")
    .slice(0, 4000);

  try {
    const res = await $fetch<{
      choices: { message: { content: string } }[];
    }>("https://openrouter.ai/api/v1/chat/completions", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${openrouterKey}`,
        "Content-Type": "application/json",
        "HTTP-Referer": "https://rebreak.org",
        "X-Title": "ReBreak Memory Extraction",
      },
      body: {
        model: "anthropic/claude-haiku-4-5",
        max_tokens: 800,
        temperature: 0.1,
        messages: [
          { role: "system", content: EXTRACTION_SYSTEM_PROMPT },
          { role: "user", content: conversationText },
        ],
      },
      timeout: 20000,
    });

    const raw = res.choices?.[0]?.message?.content?.trim();
    if (!raw) return;

    const jsonStr = raw
      .replace(/^```(?:json)?\s*/i, "")
      .replace(/\s*```$/, "")
      .trim();

    let facts: Array<{ type: string; content: string; confidence: number }> =
      [];
    try {
      facts = JSON.parse(jsonStr);
    } catch {
      console.warn(
        "[lyra-memory] extract: JSON parse failed:",
        jsonStr.slice(0, 200),
      );
      return;
    }

    if (!Array.isArray(facts)) return;

    let extracted = 0;
    for (const fact of facts) {
      if (!fact.content || (fact.confidence ?? 0) < 0.5) continue;
      if (!VALID_TYPES.includes(fact.type as LyraMemoryType)) continue;

      try {
        await upsertMemory(
          userId,
          fact.type as LyraMemoryType,
          fact.content,
          sessionId ?? "sos-session",
          Math.min(1, Math.max(0, fact.confidence ?? 0.7)),
        );
        extracted++;
      } catch (e) {
        console.error("[lyra-memory] upsert error:", e);
      }
    }

    console.log(
      `[lyra-memory] async extract done for ${userId}: ${extracted} stored`,
    );
  } catch (e) {
    // Silent — darf User nie beeinflussen
    console.error("[lyra-memory] extract error (silent):", e);
  }
}