// ============================================================================
// @mintel/page-audit — Auditor Orchestrator
// Main entry point: runs the full audit pipeline for a domain.
// ============================================================================

import * as fs from "node:fs/promises";
import * as path from "node:path";
import { DataForSeoClient, normalizePage } from "./dataforseo.js";
import { generateAuditReport } from "./report.js";
import type { AuditConfig, AuditIssue, DomainAuditResult, PageAuditData } from "./types.js";

export class PageAuditor {
    private client: DataForSeoClient;

    constructor(private config: AuditConfig) {
        this.client = new DataForSeoClient(
            config.dataForSeoLogin,
            config.dataForSeoPassword,
        );
    }

    /**
     * Run a full audit for a domain.
     * Steps:
     *  1. Start DataForSEO On-Page crawl task
     *  2. Wait for completion
     *  3. Fetch page results + broken resources
     *  4. Normalize and aggregate issues
     *  5. Generate AI report (unless lightMode)
     *  6. Save to disk
     */
    async audit(domain: string, opts?: { maxPages?: number; onProgress?: (msg: string) => void }): Promise<DomainAuditResult> {
        const log = opts?.onProgress || console.log;
        const cleanDomain = domain.replace(/^https?:\/\//, "").replace(/\/$/, "");

        log(`🔍 Starting audit for ${cleanDomain}...`);

        // Step 1: Start crawl
        const taskId = await this.client.startCrawl(domain, opts?.maxPages || 50);
        log(`📋 DataForSEO task started: ${taskId}`);

        // Step 2: Wait for completion
        log("⏳ Waiting for crawl to complete...");
        await this.client.waitForTask(taskId, 300_000);
        log("✅ Crawl complete!");

        // Step 3: Fetch results
        log("📥 Fetching page data...");
        const [rawPages, brokenResources] = await Promise.all([
            this.client.getPages(taskId, 100, 0),
            this.client.getBrokenResources(taskId),
        ]);

        // Step 4: Normalize pages
        const pages: PageAuditData[] = rawPages.map(normalizePage);

        // Count broken links per page
        for (const broken of brokenResources) {
            const sourceUrl = broken.source_url;
            const sourcePage = pages.find((p) => p.url === sourceUrl);
            if (sourcePage) sourcePage.links.broken++;
        }

        // Aggregate top issues
        const issueMap = new Map<string, AuditIssue & { count: number }>();
        for (const page of pages) {
            for (const issue of page.issues) {
                const existing = issueMap.get(issue.code);
                if (existing) {
                    existing.count++;
                } else {
                    issueMap.set(issue.code, { ...issue, count: 1 });
                }
            }
        }

        const topIssues = Array.from(issueMap.values())
            .sort((a, b) => {
                const severityOrder = { critical: 0, warning: 1, info: 2 };
                return severityOrder[a.severity] - severityOrder[b.severity] || b.count - a.count;
            })
            .slice(0, 20);

        const result: DomainAuditResult = {
            domain: cleanDomain,
            auditedAt: new Date().toISOString(),
            totalPages: pages.length,
            pages,
            topIssues,
            report: null,
            dataForSeoTaskId: taskId,
        };

        // Step 5: AI Report
        if (!this.config.lightMode && this.config.openrouterKey) {
            log("🤖 Generating AI analysis...");
            try {
                result.report = await generateAuditReport(result, this.config.openrouterKey);
                log("✅ AI report generated!");
            } catch (err: any) {
                console.warn(`⚠️ AI report failed (audit data still saved): ${err.message}`);
            }
        }

        // Step 6: Save
        await this.saveResult(result);

        return result;
    }

    private async saveResult(result: DomainAuditResult): Promise<void> {
        const outputDir = this.config.outputDir || "./out/page-audits";
        await fs.mkdir(outputDir, { recursive: true });

        const slug = result.domain.replace(/\./g, "-");
        const timestamp = new Date().toISOString().replace(/[:.]/g, "-").slice(0, 19);
        const outputPath = path.join(outputDir, `${slug}_${timestamp}.json`);

        await fs.writeFile(outputPath, JSON.stringify(result, null, 2));
        console.log(`\n📦 Audit saved to: ${outputPath}`);

        // Print summary
        console.log("\n" + "─".repeat(50));
        console.log("📊 AUDIT SUMMARY — " + result.domain);
        console.log("─".repeat(50));
        console.log(`  Pages audited: ${result.totalPages}`);
        console.log(`  Critical issues: ${result.topIssues.filter((i) => i.severity === "critical").length}`);
        console.log(`  Warnings: ${result.topIssues.filter((i) => i.severity === "warning").length}`);

        if (result.report) {
            console.log("\n🤖 AI REPORT:");
            console.log(`  Overall Health: ${result.report.overallHealth.toUpperCase()}`);
            console.log(`  SEO Score: ${result.report.seoScore}/100`);
            console.log(`  UX Score: ${result.report.uxScore}/100`);
            console.log(`  Performance Score: ${result.report.performanceScore}/100`);
            console.log(`\n  Summary: ${result.report.executiveSummary}`);
            if (result.report.criticalIssues.length > 0) {
                console.log("\n  🔴 Critical Issues:");
                for (const issue of result.report.criticalIssues) {
                    console.log(`    - ${issue}`);
                }
            }
            if (result.report.quickWins.length > 0) {
                console.log("\n  🟢 Quick Wins:");
                for (const win of result.report.quickWins) {
                    console.log(`    - ${win}`);
                }
            }
        }
        console.log("─".repeat(50));
    }
}