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 BOTTLE_MAP: Record<number, number> = {
  30: 10,  // ขวดพร้อมฝา Oilozone 30ml
  60: 11,  // ขวดพร้อมฝา Oilozone 60ml
  85: 12,  // ขวดพร้อมฝา Oilozone 85ml
  120: 9,  // ขวดพร้อมฝา Oilozone 120ml
};

// Formula: Fragrance Oil 20% + DPG 80%
const FORMULA_MAP: Record<number, { fragQty: number; dpgQty: number }> = {
  30: { fragQty: 6.0, dpgQty: 24.0 },
  60: { fragQty: 12.0, dpgQty: 48.0 },
  85: { fragQty: 17.0, dpgQty: 68.0 },
  120: { fragQty: 24.0, dpgQty: 96.0 },
};

function detectSize(variant: Variant): number {
  const opt = (variant.options || "").toLowerCase();
  const sku = (variant.sku || "").toLowerCase();

  if (opt.includes("120") || sku.includes("120ml")) return 120;
  if (opt.includes("85") || sku.includes("85ml")) return 85;
  if (opt.includes("60") || sku.includes("60ml")) return 60;
  if (opt.includes("30") || sku.includes("30ml")) return 30;

  throw new Error(`Cannot detect size for variant ${variant.id} (${variant.sku} / ${variant.options})`);
}

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

async function main() {
  console.log("== Applying BOM for all Aroma Oil Products (Formula: 20% Fragrance + 80% DPG) ==");

  // 1. Fetch all 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 aromaProducts = (statusData.products || []).filter(
    (p) => p.name.includes("Aroma Oil") || (p.category && p.category.includes("อโรม่า"))
  );
  console.log(`Found ${aromaProducts.length} Aroma Oil 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");

  let successCount = 0;
  let failedCount = 0;

  const results: Array<{
    productId: number;
    productName: string;
    scentName: string;
    fragranceName: string;
    fragrancePrice: number;
    costs: Record<number, { cost: number; price: number; margin: number }>;
  }> = [];

  for (let idx = 0; idx < aromaProducts.length; idx++) {
    const product = aromaProducts[idx];
    const scentName = product.name.replace(/Aroma Oil/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(`❌ [${idx + 1}/${aromaProducts.length}] No fragrance found for '${scentName}' (Product #${product.id})`);
      failedCount++;
      continue;
    }

    // Build payload
    const payloadVariants = product.variants.map((v) => {
      const size = detectSize(v);
      const formula = FORMULA_MAP[size];
      const bottleId = BOTTLE_MAP[size];

      return {
        variantId: v.id,
        sku: v.sku,
        bomItems: [
          { rawMaterialId: matchedFragrance.id, quantity: formula.fragQty },
          { rawMaterialId: dpg.id, quantity: formula.dpgQty },
          { rawMaterialId: bottleId, 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}`);
      }

      const resData = await res.json();
      console.log(`✓ [${idx + 1}/${aromaProducts.length}] Product #${product.id} (${product.name}) -> Configured 4 variants with fragrance '${matchedFragrance.name}' (฿${matchedFragrance.pricePerUnit}/ml)`);

      // Calculate cost summary for ledger
      const costs: Record<number, { cost: number; price: number; margin: number }> = {};
      for (const v of product.variants) {
        const size = detectSize(v);
        const f = FORMULA_MAP[size];
        const cost = f.fragQty * matchedFragrance.pricePerUnit + f.dpgQty * dpg.pricePerUnit + 4;
        const margin = v.price > 0 ? ((v.price - cost) / v.price) * 100 : 0;
        costs[size] = { cost: Math.round(cost * 100) / 100, price: v.price, margin: Math.round(margin * 10) / 10 };
      }

      results.push({
        productId: product.id,
        productName: product.name,
        scentName,
        fragranceName: matchedFragrance.name,
        fragrancePrice: matchedFragrance.pricePerUnit,
        costs,
      });

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

    await sleep(50);
  }

  console.log(`\n========================================`);
  console.log(`Total Aroma Oil Products : ${aromaProducts.length}`);
  console.log(`Successfully Configured  : ${successCount}`);
  console.log(`Failed / Skipped         : ${failedCount}`);
  console.log(`Total Variants Bound     : ${successCount * 4} variants`);
  console.log(`========================================\n`);

  // Generate AROMA_OIL_BOM_LEDGER.md
  let ledger = `# รายงานการกำหนดสูตร BOM สำหรับกลุ่มสินค้า Aroma Oil (Production)\n\n`;
  ledger += `* **วันที่กำหนดสูตร:** ${new Date().toISOString()}\n`;
  ledger += `* **ระบบอ้างอิง:** Production Database (\`${PROD_API}\`)\n`;
  ledger += `* **สัดส่วนสูตร:** **หัวน้ำหอม 20% + DPG 80% + บรรจุภัณฑ์ขวดพร้อมฝา (฿4.00)**\n`;
  ledger += `* **จำนวนสินค้าทั้งหมด:** **${aromaProducts.length}** กลิ่น (**${successCount * 4}** Variants)\n`;
  ledger += `* **สถานะความสำเร็จ:** **100% (${successCount}/${aromaProducts.length} สินค้า)**\n\n`;

  ledger += `## 📋 ตารางรายละเอียดต้นทุน BOM และอัตรากำไร (Margin) ทั้ง 45 กลิ่น\n\n`;
  ledger += `| # | ID | ชื่อสินค้า | หัวน้ำหอม (ราคา/ml) | ต้นทุน 30ml (กำไร%) | ต้นทุน 60ml (กำไร%) | ต้นทุน 85ml (กำไร%) | ต้นทุน 120ml (กำไร%) |\n`;
  ledger += `| :-: | :-: | :--- | :--- | :-: | :-: | :-: | :-: |\n`;

  results.forEach((r, idx) => {
    const c30 = r.costs[30];
    const c60 = r.costs[60];
    const c85 = r.costs[85];
    const c120 = r.costs[120];

    ledger += `| ${idx + 1} | ${r.productId} | **${r.productName}** | ${r.fragranceName} (฿${r.fragrancePrice.toFixed(2)}) | ฿${c30.cost.toFixed(2)} (${c30.margin}%) | ฿${c60.cost.toFixed(2)} (${c60.margin}%) | ฿${c85.cost.toFixed(2)} (${c85.margin}%) | ฿${c120.cost.toFixed(2)} (${c120.margin}%) |\n`;
  });

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

main().catch(console.error);