// Analyze pass: extract taxonomy terms from prose.

import "server-only";
import { defaultGateway, chatJSON, type Message } from "../gateway";
import { loadPrompt } from "../prompts";
import type { DetectedTerm } from "../../db/repo";

interface RawTerm {
  label?: string;
  parentLabel?: string | null;
  synonyms?: string[];
}

const taxonomyJsonSchema = {
  type: "object",
  additionalProperties: false,
  required: ["terms"],
  properties: {
    terms: {
      type: "array",
      items: {
        type: "object",
        additionalProperties: false,
        required: ["label"],
        properties: {
          label: { type: "string", minLength: 1 },
          parentLabel: { type: ["string", "null"] },
          synonyms: { type: "array", items: { type: "string" } },
        },
      },
    },
  },
} as const;

export interface TaxonomyResult {
  terms: DetectedTerm[];
  inputTokens: number;
  outputTokens: number;
  provider: string;
  model: string;
}

export async function analyzeTaxonomy(documentText: string): Promise<TaxonomyResult> {
  const prompt = loadPrompt("socrates/analyze-taxonomy.md");
  const gateway = defaultGateway();
  const messages: Message[] = [
    { role: "system", content: prompt },
    { role: "user", content: `Document:\n\n${documentText}` },
  ];

  const { value, result } = await chatJSON<{ terms?: RawTerm[] }>(gateway, messages, {
    temperature: 0.2,
    maxTokens: 1500,
    jsonSchema: { name: "taxonomy", schema: taxonomyJsonSchema as Record<string, unknown> },
    jsonObjectMode: true,
    maxRepairs: 2,
  });

  const seen = new Set<string>();
  const terms: DetectedTerm[] = [];
  for (const t of value?.terms ?? []) {
    const label = (t.label ?? "").trim();
    if (!label) continue;
    const key = label.toLowerCase();
    if (seen.has(key)) continue;
    seen.add(key);
    terms.push({
      label,
      parentLabel: t.parentLabel?.trim() || null,
      synonyms: Array.isArray(t.synonyms) ? t.synonyms.filter(s => typeof s === "string") : [],
    });
  }

  return {
    terms,
    inputTokens: result.inputTokens,
    outputTokens: result.outputTokens,
    provider: gateway.provider,
    model: gateway.model,
  };
}