// ============================================================================
// Step 02: Audit — Feature Auditor + Skeptical Review (Gemini Flash)
// ============================================================================

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

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

    if (!state.facts) {
        return { success: false, error: "No facts from Step 01 available." };
    }

    const systemPrompt = `
You are a "Strict Cost Controller". Your mission is to prevent over-billing.
Review the extracted FEATURES against the BRIEFING and the EXISTING SITE ANALYSIS.

### RULE OF THUMB:
- A "Feature" (1.500 €) is ONLY justified for complex, dynamic systems (logic, database, CMS-driven management, advanced filtering).
- Simple lists, information sections, or static descriptions (e.g., "Messen", "Team", "Historie", "Jobs" as mere text) are ALWAYS "Pages" (600 €).
- If the briefing doesn't explicitly mention "Management System", "Filterable Database", or "Client Login", it is a PAGE.

### ADDITIONAL CHECKS:
1. If any feature maps to an entity that has its own external website (listed in EXTERNAL_DOMAINS), remove it entirely — it's out of scope.
2. Videos are ASSETS not pages. Remove any video-related entries from pages.
3. If the existing site has features (search, forms, etc.), ensure they are in the functions list.

### MISSION:
Return the corrected 'features', 'otherPages', and 'functions' arrays.

### OUTPUT FORMAT:
{
  "features": string[],
  "otherPages": string[],
  "functions": string[],
  "removedItems": [{ "item": string, "reason": string }],
  "addedItems": [{ "item": string, "reason": string }]
}
`;

    const userPrompt = `
EXTRACTED FACTS:
${JSON.stringify(state.facts, null, 2)}

BRIEFING:
${state.briefing}

EXTERNAL DOMAINS (have own websites, OUT OF SCOPE):
${state.siteProfile?.externalDomains?.join(", ") || "none"}

EXISTING FEATURES ON CURRENT SITE:
${state.siteProfile?.existingFeatures?.join(", ") || "none"}
`;

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

        // Apply audit results to facts
        const auditedFacts = { ...state.facts };
        auditedFacts.features = data.features || [];
        auditedFacts.otherPages = [
            ...new Set([...(auditedFacts.otherPages || []), ...(data.otherPages || [])]),
        ];
        if (data.functions) {
            auditedFacts.functions = [
                ...new Set([...(auditedFacts.functions || []), ...data.functions]),
            ];
        }

        // Log changes
        if (data.removedItems?.length) {
            console.log("  📉 Audit removed:");
            for (const item of data.removedItems) {
                console.log(`     - ${item.item}: ${item.reason}`);
            }
        }
        if (data.addedItems?.length) {
            console.log("  📈 Audit added:");
            for (const item of data.addedItems) {
                console.log(`     + ${item.item}: ${item.reason}`);
            }
        }

        return {
            success: true,
            data: auditedFacts,
            usage: {
                step: "02-audit",
                model: models.flash,
                promptTokens: usage.promptTokens,
                completionTokens: usage.completionTokens,
                cost: usage.cost,
                durationMs: Date.now() - startTime,
            },
        };
    } catch (err) {
        return { success: false, error: `Audit step failed: ${(err as Error).message}` };
    }
}