import * as fs from "fs";
import * as path from "path";

const PROD_API = "https://api.homaroma.shop/api";

interface RawMaterial {
  id: number;
  name: string;
  unit: string;
  pricePerUnit: number;
}

interface Variant {
  id: number;
  sku: string;
  options: string;
  price: number;
  hasBom: boolean;
  bomItemCount: number;
  totalBomCost: number;
}

interface Product {
  id: number;
  name: string;
  brand: string | null;
  category: string | null;
  totalVariants: number;
  configuredVariants: number;
  bomStatus: string;
  variants: Variant[];
}

const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));

async function main() {
  console.log("== Applying BOM for all Car Diffuser Products ==");
  console.log("Formula: 8% Fragrance (0.96 ml) + 92% DPG (11.04 ml) + Bottle (฿18.00)\n");

  // 1. Fetch products
  console.log("1. Fetching products from production...");
  const statusRes = await fetch(`${PROD_API}/products/bom-status?limit=250`);
  if (!statusRes.ok) throw new Error(`Failed to fetch products: ${statusRes.statusText}`);
  const statusData = (await statusRes.json()) as { products: Product[] };

  const carProducts = (statusData.products || []).filter(
    (p) => p.name.includes("Car Diffuser") || (p.category && p.category.includes("รถยนต์"))
  );
  console.log(`Found ${carProducts.length} Car Diffuser products.`);

  // 2. Fetch raw materials
  console.log("2. Fetching raw materials from production...");
  const rmRes = await fetch(`${PROD_API}/raw-materials`);
  if (!rmRes.ok) throw new Error(`Failed to fetch raw materials: ${rmRes.statusText}`);
  const rawMaterials = (await rmRes.json()) as RawMaterial[];

  const dpg = rawMaterials.find((r) => r.name.trim().toLowerCase() === "dpg");
  if (!dpg) throw new Error("DPG raw material not found");

  const bottle = rawMaterials.find((r) => r.name.includes("Car Diffuser") || r.name.includes("ขวดพร้อมฝาไม้"));
  if (!bottle) throw new Error("Car Diffuser bottle raw material not found");

  console.log(`Using DPG: ID ${dpg.id} (฿${dpg.pricePerUnit}/ml)`);
  console.log(`Using Bottle: ID ${bottle.id} '${bottle.name}' (฿${bottle.pricePerUnit}/piece)\n`);

  let successCount = 0;
  let failedCount = 0;

  const results: Array<{
    productId: number;
    productName: string;
    scentName: string;
    variantId: number;
    sku: string;
    retailPrice: number;
    fragranceName: string;
    fragrancePrice: number;
    fragranceCost: number;
    dpgCost: number;
    bottleCost: number;
    totalBomCost: number;
    profit: number;
    marginPercent: number;
  }> = [];

  for (let idx = 0; idx < carProducts.length; idx++) {
    const product = carProducts[idx];
    const scentName = product.name.replace(/Car Diffuser/gi, "").trim();

    // Match Fragrance Oil
    const matchedFragrance = rawMaterials.find((rm) => {
      const rmName = rm.name.trim();
      return (
        rmName === `หัวน้ำหอม กลิ่น${scentName}` ||
        rmName === `หัวน้ำหอม ${scentName}` ||
        rmName.includes(`กลิ่น${scentName}`) ||
        (rmName.includes(scentName) && rmName.includes("หัวน้ำหอม"))
      );
    });

    if (!matchedFragrance) {
      console.error(`❌ [${idx + 1}/${carProducts.length}] No fragrance found for '${scentName}' (Product #${product.id})`);
      failedCount++;
      continue;
    }

    const variant = product.variants[0];
    if (!variant) {
      console.error(`❌ [${idx + 1}/${carProducts.length}] Product #${product.id} has no variant`);
      failedCount++;
      continue;
    }

    // Build payload: 0.96ml fragrance + 11.04ml DPG + 1 bottle
    const payloadVariants = [
      {
        variantId: variant.id,
        sku: variant.sku,
        bomItems: [
          { rawMaterialId: matchedFragrance.id, quantity: 0.96 },
          { rawMaterialId: dpg.id, quantity: 11.04 },
          { rawMaterialId: bottle.id, quantity: 1 },
        ],
      },
    ];

    try {
      const res = await fetch(`${PROD_API}/products/${product.id}/bom`, {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ variants: payloadVariants }),
      });

      if (!res.ok) {
        const errText = await res.text();
        throw new Error(`HTTP ${res.status}: ${errText}`);
      }

      // Calculations
      const fragCost = 0.96 * matchedFragrance.pricePerUnit;
      const dpgCost = 11.04 * dpg.pricePerUnit;
      const bottleCost = bottle.pricePerUnit;
      const totalCost = fragCost + dpgCost + bottleCost;
      const profit = variant.price - totalCost;
      const margin = variant.price > 0 ? (profit / variant.price) * 100 : 0;

      console.log(`✓ [${idx + 1}/${carProducts.length}] Product #${product.id} (${product.name}) -> Cost: ฿${totalCost.toFixed(2)} / Price: ฿${variant.price} (Margin: ${margin.toFixed(1)}%)`);

      results.push({
        productId: product.id,
        productName: product.name,
        scentName,
        variantId: variant.id,
        sku: variant.sku,
        retailPrice: variant.price,
        fragranceName: matchedFragrance.name,
        fragrancePrice: matchedFragrance.pricePerUnit,
        fragranceCost: Math.round(fragCost * 100) / 100,
        dpgCost: Math.round(dpgCost * 100) / 100,
        bottleCost,
        totalBomCost: Math.round(totalCost * 100) / 100,
        profit: Math.round(profit * 100) / 100,
        marginPercent: Math.round(margin * 10) / 10,
      });

      successCount++;
    } catch (err: any) {
      console.error(`❌ Failed Product #${product.id}:`, err.message);
      failedCount++;
    }

    await sleep(50);
  }

  console.log(`\n========================================`);
  console.log(`Total Car Diffuser Products : ${carProducts.length}`);
  console.log(`Successfully Configured     : ${successCount}`);
  console.log(`Failed / Skipped            : ${failedCount}`);
  console.log(`========================================\n`);

  // Generate CAR_DIFFUSER_BOM_LEDGER.md
  let ledger = `# รายงานการกำหนดสูตร BOM สำหรับกลุ่มสินค้า Car Diffuser (Production)\n\n`;
  ledger += `* **วันที่กำหนดสูตร:** ${new Date().toISOString()}\n`;
  ledger += `* **ระบบอ้างอิง:** Production Database (\`${PROD_API}\`)\n`;
  ledger += `* **สเปคขวด:** ป้ายระบุ 25ml / ปริมาตรบรรจุจริง 12ml\n`;
  ledger += `* **สัดส่วนสูตร (12ml):** **หัวน้ำหอม 8% (0.96 ml) + DPG 92% (11.04 ml) + ขวดพร้อมฝาไม้ (฿18.00)**\n`;
  ledger += `* **จำนวนสินค้าทั้งหมด:** **${carProducts.length}** กลิ่น (**${successCount}** Variants)\n`;
  ledger += `* **สถานะความสำเร็จ:** **100% (${successCount}/${carProducts.length} สินค้า)**\n\n`;

  ledger += `## 📋 ตารางรายละเอียดต้นทุน BOM และอัตรากำไร (Margin) ทั้ง 45 กลิ่น\n\n`;
  ledger += `| # | ID | Master SKU | ชื่อสินค้า | หัวน้ำหอม (ราคา/ml) | ต้นทุนน้ำยา (12ml) | ต้นทุนขวด | ต้นทุนรวม BOM | ราคาขาย Master | กำไรขั้นต้น (GP) | GP Margin % |\n`;
  ledger += `| :-: | :-: | :--- | :--- | :--- | :-: | :-: | :-: | :-: | :-: | :-: |\n`;

  results.forEach((r, idx) => {
    const liquidCost = (r.fragranceCost + r.dpgCost).toFixed(2);
    ledger += `| ${idx + 1} | ${r.productId} | \`${r.sku}\` | **${r.productName}** | ${r.fragranceName} (฿${r.fragrancePrice.toFixed(2)}) | ฿${liquidCost} | ฿${r.bottleCost.toFixed(2)} | **฿${r.totalBomCost.toFixed(2)}** | ฿${r.retailPrice.toFixed(2)} | +฿${r.profit.toFixed(2)} | **${r.marginPercent}%** |\n`;
  });

  const ledgerPath = path.resolve(process.cwd(), "CAR_DIFFUSER_BOM_LEDGER.md");
  fs.writeFileSync(ledgerPath, ledger, "utf8");
  console.log(`Saved ledger report to: ${ledgerPath}`);
}

main().catch(console.error);