#!/usr/bin/env node
/**
 * fill-ddg-images.ts — DuckDuckGo Image Search for remaining disease images.
 *
 * No API key needed. Searches DuckDuckGo Images API for each disease
 * without an image and updates the Turso DB.
 *
 * Prioritizes by severity (critical → high → moderate → low).
 * Runs at 1 request/sec to be polite to DuckDuckGo.
 * Resumable via state file (scripts/.ddg-progress.json).
 *
 * Usage:
 *   cd apps/web && npx tsx scripts/fill-ddg-images.ts
 */

import { readFileSync, writeFileSync } from "fs";
import { resolve } from "path";

// Load .env.development for DB creds
const envPath = resolve(__dirname, "../.env.development");
try {
  const env = readFileSync(envPath, "utf-8");
  for (const line of env.split("\n")) {
    const trimmed = line.trim();
    if (trimmed && !trimmed.startsWith("#")) {
      const eqIdx = trimmed.indexOf("=");
      if (eqIdx > 0) {
        const key = trimmed.slice(0, eqIdx).trim();
        const val = trimmed.slice(eqIdx + 1).trim();
        if (!process.env[key]) process.env[key] = val;
      }
    }
  }
} catch {}

import { getDb, closeDb } from "../src/lib/db/index";
import { diseases } from "../src/lib/db/schema";
import { createClient } from "@libsql/client";
import { sql } from "drizzle-orm";

// DuckDuckGo
import { imageSearch } from "@mudbill/duckduckgo-images-api";

interface DiseaseRow {
  id: string;
  name: string;
  scientificName: string;
  severity: string;
  plantId: string;
}

// ─── Config ──────────────────────────────────────────────────────────────────

const POLITE_DELAY = 800; // ms between calls
const DB_FLUSH_BATCH = 50;
const STATE_FILE = resolve(__dirname, ".ddg-progress.json");

interface RunState {
  processedIds: string[];
  totalFound: number;
}

function loadState(): RunState | null {
  try {
    return JSON.parse(readFileSync(STATE_FILE, "utf-8"));
  } catch {
    return null;
  }
}

function saveState(processedIds: string[], totalFound: number) {
  writeFileSync(STATE_FILE, JSON.stringify({ processedIds, totalFound }, null, 2), "utf-8");
}

// ─── DuckDuckGo Search ───────────────────────────────────────────────────────

async function searchImage(query: string): Promise<string | null> {
  try {
    const results = await imageSearch({ query, safe: true, iterations: 1, retries: 2 });
    if (!results || results.length === 0) return null;

    // Prefer non-stock images
    for (const r of results) {
      if (r.image && !/(dreamstime|shutterstock|alamy|istock|123rf)/i.test(r.image)) {
        return r.image;
      }
    }
    return results[0].image || results[0].thumbnail || null;
  } catch {
    // DuckDuckGo may block or timeout; silently skip
    return null;
  }
}

// ─── Main ────────────────────────────────────────────────────────────────────

async function main() {
  console.log("\n🦆 DuckDuckGo Disease Image Filler\n");

  const db = getDb();

  // Load state
  const state = loadState();
  const processedSet = new Set(state?.processedIds || []);
  const totalFoundPrev = state?.totalFound ?? 0;

  // Get all diseases that still need images
  const allDiseases = (await db
    .select({
      id: diseases.id,
      name: diseases.name,
      scientificName: diseases.scientificName,
      severity: diseases.severity,
      plantId: diseases.plantId,
    })
    .from(diseases)
    .where(sql`(image_url IS NULL OR image_url = '')`)
    .all()) as DiseaseRow[];

  console.log(`📋 ${allDiseases.length} diseases need images\n`);

  if (allDiseases.length === 0) {
    console.log("✅ All diseases already have images!\n");
    closeDb();
    return;
  }

  // Sort by severity: critical > high > moderate > low
  const severityOrder: Record<string, number> = { critical: 0, high: 1, moderate: 2, low: 3 };
  allDiseases.sort((a, b) => (severityOrder[a.severity] ?? 99) - (severityOrder[b.severity] ?? 99));

  // Filter out already-processed
  const pending = allDiseases.filter((d) => !processedSet.has(d.id));

  console.log(
    `📊 Remaining: critical=${allDiseases.filter((d) => d.severity === "critical" && !processedSet.has(d.id)).length}, ` +
      `high=${allDiseases.filter((d) => d.severity === "high" && !processedSet.has(d.id)).length}, ` +
      `moderate=${allDiseases.filter((d) => d.severity === "moderate" && !processedSet.has(d.id)).length}, ` +
      `low=${allDiseases.filter((d) => d.severity === "low" && !processedSet.has(d.id)).length}\n`,
  );

  if (pending.length === 0) {
    console.log("✅ All remaining diseases already attempted\n");
    closeDb();
    return;
  }

  const raw = createClient({
    url: process.env.DATABASE_URL!,
    authToken: process.env.DATABASE_TOKEN!,
  });

  const processedIds: string[] = state?.processedIds ?? [];
  let found = totalFoundPrev;
  let updates: Array<{ id: string; url: string }> = [];

  for (let i = 0; i < pending.length; i++) {
    const d = pending[i];
    const sev = d.severity.padEnd(8);

    // Build search query — "[disease] on [plant]" phrasing for better specificity
    const plantName = d.plantId.replace(/-/g, " ").replace(/\b\w/g, (c) => c.toUpperCase());
    const query1 = `${d.name} on ${plantName} plant disease`;
    const query2 = `${d.scientificName || d.name} on ${plantName} disease`;
    const query3 = `${d.name} plant disease ${plantName}`;
    const query4 = `${d.name} plant`;
    const query5 = `${d.name} symptom`;

    process.stdout.write(
      `  [${String(i + 1).padStart(4)}/${pending.length}] [${sev}] ${d.name.substring(0, 42).padEnd(44)} `,
    );

    // Try queries in order until we get a result
    let url: string | null = null;
    for (const q of [query1, query2, query3, query4, query5]) {
      url = await searchImage(q);
      if (url) break;
    }

    if (url) {
      updates.push({ id: d.id, url });
      found++;
      processedIds.push(d.id);
      console.log("✅");
    } else {
      processedIds.push(d.id);
      console.log("❌");
    }

    // Flush to DB in batches
    if (updates.length >= DB_FLUSH_BATCH) {
      await raw.batch(
        updates.map((u) => ({
          sql: "UPDATE diseases SET image_url = ?, updated_at = datetime() WHERE id = ?",
          args: [u.url, u.id],
        })),
        "write",
      );
      console.log(`   → Flushed ${updates.length} to DB`);
      updates = [];
    }

    // Save state every 50
    if ((i + 1) % 50 === 0) {
      saveState(processedIds, found);
    }

    // Be polite — 1 req/sec
    await new Promise((r) => setTimeout(r, POLITE_DELAY));
  }

  // Final flush
  if (updates.length > 0) {
    await raw.batch(
      updates.map((u) => ({
        sql: "UPDATE diseases SET image_url = ?, updated_at = datetime() WHERE id = ?",
        args: [u.url, u.id],
      })),
      "write",
    );
    console.log(`   → Flushed ${updates.length} to DB`);
  }

  saveState(processedIds, found);
  raw.close();

  // Final report
  const finalList = await db
    .select({ id: diseases.id, name: diseases.name, imageUrl: diseases.imageUrl })
    .from(diseases)
    .all();
  const w = finalList.filter((d) => d.imageUrl);
  const wo = finalList.filter((d) => !d.imageUrl);

  console.log(`\n${"═".repeat(50)}`);
  console.log(`🦆 DUCKDUCKGO SEARCH COMPLETE`);
  console.log(`${"═".repeat(50)}`);
  console.log(`   Processed: ${pending.length}`);
  console.log(`   Found this run: ${found - totalFoundPrev}`);
  console.log(`   Total with images: ${w.length}/${finalList.length}`);
  console.log(`   Still missing: ${wo.length}`);

  if (wo.length > 0) {
    const reportPath = resolve(__dirname, ".ddg-image-review-needed.md");
    let report = "# Disease Images - Still Missing (DDG)\n\n";
    report += `Generated: ${new Date().toISOString()}\n\n`;
    report += `## Summary\n\n`;
    report += `- Total: ${finalList.length}\n`;
    report += `- With images: ${w.length}\n`;
    report += `- Still missing: ${wo.length}\n\n`;
    report += `## Missing Diseases\n\n`;
    for (const d of wo) {
      report += `- ${d.name} (\`${d.id}\`)\n`;
    }
    writeFileSync(reportPath, report, "utf-8");
    console.log(`\n📝 Missing report: ${reportPath}`);
  } else {
    console.log("\n✅ ALL diseases now have images!");
  }

  closeDb();
  console.log();
}

main().catch((err) => {
  console.error("\n❌ Fatal:", err);
  process.exit(1);
});