// ============================================================================
// Step 05: Synthesize — Position Descriptions (Gemini Pro)
// ============================================================================

import { llmJsonRequest } from "../llm-client.js";
import type { EstimationState, StepResult, PipelineConfig } from "../types.js";
import { DEFAULT_MODELS } from "../types.js";

export async function executeSynthesize(
    state: EstimationState,
    config: PipelineConfig,
): Promise<StepResult> {
    const models = { ...DEFAULT_MODELS, ...config.modelsOverride };
    const startTime = Date.now();

    if (!state.concept?.auditedFacts || !state.concept?.architecture?.sitemap) {
        return { success: false, error: "Missing audited facts or sitemap." };
    }

    const facts = state.concept.auditedFacts;

    // Determine which positions are required
    const requiredPositions = [
        "Das technische Fundament",
        (facts.selectedPages?.length || 0) + (facts.otherPages?.length || 0) > 0
            ? "Individuelle Seiten"
            : null,
        facts.features?.length > 0 ? "System-Module (Features)" : null,
        facts.functions?.length > 0 ? "Logik-Funktionen" : null,
        facts.apiSystems?.length > 0 ? "Schnittstellen (API)" : null,
        facts.cmsSetup ? "Inhalts-Verwaltung" : null,
        facts.multilang ? "Mehrsprachigkeit" : null,
        "Inhaltliche Initial-Pflege",
        "Sorglos Betrieb",
    ].filter(Boolean);

    const systemPrompt = `
You are a Senior Solution Architect. Write position descriptions for a professional B2B quote.

### REQUIRED POSITIONS (STRICT — ONLY DESCRIBE THESE):
${requiredPositions.map((p) => `"${p}"`).join(", ")}

### RULES (STRICT):
1. NO FIRST PERSON: NEVER "Ich", "Mein", "Wir", "Unser". Lead with nouns or passive verbs.
2. QUANTITY PARITY: Description MUST list EXACTLY the number of items matching 'qty'.
3. CMS GUARD: If cmsSetup=false, do NOT mention "CMS", "Inhaltsverwaltung". Use "Plattform-Struktur".
4. TONE: "Erstellung von...", "Anbindung der...", "Bereitstellung von...". Technical, high-density.
5. PAGES: List actual page names. NO implementation notes in parentheses.
6. HARD SPECIFICS: Use industry terms from the briefing (e.g. "Kabeltiefbau", "110 kV").
7. KEYS: Return EXACTLY the keys from REQUIRED POSITIONS.
8. NO AGB: NEVER mention "AGB" or "Geschäftsbedingungen".
9. Sorglos Betrieb: "Inklusive 1 Jahr technischer Betrieb, Hosting, SSL, Sicherheits-Updates, Monitoring und techn. Support."
10. Inhaltliche Initial-Pflege: Refers to DATENSÄTZE (datasets like products, references), NOT Seiten.
    Use "Datensätze" in the description, not "Seiten".
11. Mehrsprachigkeit: This is a +20% markup on the subtotal. NOT an API. NOT a Schnittstelle.

### EXAMPLES:
- GOOD: "Erstellung der Seiten: Startseite, Über uns, Leistungen, Kontakt."
- GOOD: "Native API-Anbindung an Google Maps mit individueller Standort-Visualisierung."
- BAD: "Ich richte dir das CMS ein."
- BAD: "Verschiedene Funktionen" (too generic — name the things!)

### DATA CONTEXT:
${JSON.stringify({ facts, sitemap: state.concept.architecture.sitemap, strategy: { briefingSummary: state.concept.strategy.briefingSummary } }, null, 2)}

### OUTPUT FORMAT:
{
  "positionDescriptions": { "Das technische Fundament": string, ... }
}
`;

    try {
        const { data, usage } = await llmJsonRequest({
            model: models.pro,
            systemPrompt,
            userPrompt: state.concept.briefing,
            apiKey: config.openrouterKey,
        });

        return {
            success: true,
            data: data.positionDescriptions || data,
            usage: {
                step: "05-synthesize",
                model: models.pro,
                promptTokens: usage.promptTokens,
                completionTokens: usage.completionTokens,
                cost: usage.cost,
                durationMs: Date.now() - startTime,
            },
        };
    } catch (err) {
        return { success: false, error: `Synthesize step failed: ${(err as Error).message}` };
    }
}