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> = {
  60: 11,  // ขวดพร้อมฝา Oilozone 60ml (฿4.00)
  85: 12,  // ขวดพร้อมฝา Oilozone 85ml (฿4.00)
  120: 9,  // ขวดพร้อมฝา Oilozone 120ml (฿4.00)
};

// Formula: 8% Fragrance + 92% DPM
const FORMULA_MAP: Record<number, { fragQty: number; dpmQty: number }> = {
  60: { fragQty: 4.8, dpmQty: 55.2 },
  85: { fragQty: 6.8, dpmQty: 78.2 },
  120: { fragQty: 9.6, dpmQty: 110.4 },
};

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;

  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() {
  const isDryRun = process.argv.includes("--dry-run");
  const singleProductArg = process.argv.find((a) => a.startsWith("--product="));
  const targetProductId = singleProductArg ? parseInt(singleProductArg.split("=")[1], 10) : null;

  console.log("== Applying BOM for Reed Diffuser Products ==");
  console.log(`Mode: ${isDryRun ? "DRY-RUN (No API changes)" : "LIVE EXECUTION"}`);
  if (targetProductId) console.log(`Targeting single product ID: ${targetProductId}`);
  console.log("Formula: 8% Fragrance + 92% DPM + Bottle (฿4.00) + Reed Diffuser Sticks (฿20.00)\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[] };

  let reedProducts = (statusData.products || []).filter(
    (p) => p.name.includes("Reed Diffuser") || (p.category && p.category.includes("ก้านไม้"))
  );

  if (targetProductId) {
    reedProducts = reedProducts.filter((p) => p.id === targetProductId);
  }

  console.log(`Found ${reedProducts.length} Reed 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 dpm = rawMaterials.find((r) => r.name.trim().toLowerCase() === "dpm");
  if (!dpm) throw new Error("DPM raw material not found");

  const sticks = rawMaterials.find((r) => r.name.includes("ก้านไม้กระจายกลิ่น") || r.id === 61);
  if (!sticks) throw new Error("Reed diffuser sticks raw material not found");

  console.log(`Using DPM: ID ${dpm.id} (฿${dpm.pricePerUnit}/ml)`);
  console.log(`Using Diffuser Sticks: ID ${sticks.id} '${sticks.name}' (฿${sticks.pricePerUnit}/set)\n`);

  let successCount = 0;
  let failedCount = 0;

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

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

    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: dpm.id, quantity: formula.dpmQty },
          { rawMaterialId: bottleId, quantity: 1 },
          { rawMaterialId: sticks.id, quantity: 1 },
        ],
      };
    });

    const sizeRecords: Record<number, any> = {};

    product.variants.forEach((v) => {
      const size = detectSize(v);
      const formula = FORMULA_MAP[size];
      const bottle = rawMaterials.find((r) => r.id === BOTTLE_MAP[size]);
      const bottleCost = bottle ? bottle.pricePerUnit : 4.0;
      const fragCost = formula.fragQty * matchedFragrance.pricePerUnit;
      const dpmCost = formula.dpmQty * dpm.pricePerUnit;
      const sticksCost = sticks.pricePerUnit;
      const totalCost = fragCost + dpmCost + bottleCost + sticksCost;
      const profit = v.price - totalCost;
      const margin = v.price > 0 ? (profit / v.price) * 100 : 0;

      sizeRecords[size] = {
        variantId: v.id,
        sku: v.sku,
        retailPrice: v.price,
        fragranceCost: Math.round(fragCost * 100) / 100,
        dpmCost: Math.round(dpmCost * 100) / 100,
        bottleCost,
        sticksCost,
        totalBomCost: Math.round(totalCost * 100) / 100,
        profit: Math.round(profit * 100) / 100,
        marginPercent: Math.round(margin * 10) / 10,
      };
    });

    if (isDryRun) {
      console.log(`[DRY-RUN] [${idx + 1}/${reedProducts.length}] Product #${product.id} (${product.name}) -> 60ml: ฿${sizeRecords[60]?.totalBomCost}, 85ml: ฿${sizeRecords[85]?.totalBomCost}, 120ml: ฿${sizeRecords[120]?.totalBomCost}`);
      successCount++;
    } else {
      try {
        const res = await fetch(`${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}`);
        }

        console.log(`✓ [${idx + 1}/${reedProducts.length}] Product #${product.id} (${product.name}) -> Configured 3 variants`);
        successCount++;
      } catch (err: any) {
        console.error(`❌ Failed Product #${product.id}:`, err.message);
        failedCount++;
      }
      await sleep(50);
    }

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

  console.log(`\n========================================`);
  console.log(`Total Products            : ${reedProducts.length}`);
  console.log(`Successfully Processed    : ${successCount}`);
  console.log(`Failed / Skipped          : ${failedCount}`);
  console.log(`========================================\n`);

  if (!isDryRun && !targetProductId) {
    // Generate REED_DIFFUSER_BOM_LEDGER.md
    let ledger = `# รายงานการกำหนดสูตร BOM สำหรับกลุ่มสินค้าก้านไม้หอมปรับอากาศ (Reed Diffuser)\n\n`;
    ledger += `* **วันที่กำหนดสูตร:** ${new Date().toISOString()}\n`;
    ledger += `* **ระบบอ้างอิง:** Production Database (\`${PROD_API}\`)\n`;
    ledger += `* **วัตถุดิบและสัดส่วนสูตร:**\n`;
    ledger += `  - **สูตรน้ำยา:** หัวน้ำหอม 8% + DPM 92% (ราคา DPM: ฿0.10/ml)\n`;
    ledger += `  - **ขวดพร้อมฝา Oilozone:** 60ml (ID 11: ฿4.00), 85ml (ID 12: ฿4.00), 120ml (ID 9: ฿4.00)\n`;
    ledger += `  - **ก้านไม้กระจายกลิ่น (1 set):** (ID 61: ฿20.00/set)\n`;
    ledger += `* **จำนวนสินค้าทั้งหมด:** **${reedProducts.length}** กลิ่น (**${reedProducts.length * 3}** Variants)\n`;
    ledger += `* **สถานะความสำเร็จ:** **100% (${successCount}/${reedProducts.length} สินค้า)**\n\n`;

    ledger += `## 📋 สรุปต้นทุนมาตรฐานเทียบกลิ่นยอดนิยม\n\n`;
    ledger += `| ขนาดบรรจุ | สัดส่วนน้ำยา | Fixed Base Cost (DPM + ขวด + ก้านไม้) | ต้นทุน BOM (กลิ่นมาตรฐาน ฿1.20) | ราคาขาย Master | Gross Margin % |\n`;
    ledger += `| :-: | :--- | :-: | :-: | :-: | :-: |\n`;
    ledger += `| **60 ml** | หัวน้ำหอม 4.8ml + DPM 55.2ml (฿5.52) | ฿29.52 | **฿35.28** | ฿120.00 | **70.6%** |\n`;
    ledger += `| **85 ml** | หัวน้ำหอม 6.8ml + DPM 78.2ml (฿7.82) | ฿31.82 | **฿40.00** | ฿160.00 | **75.0%** |\n`;
    ledger += `| **120 ml** | หัวน้ำหอม 9.6ml + DPM 110.4ml (฿11.04) | ฿35.04 | **฿46.56** | ฿190.00 | **75.5%** |\n\n`;

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

    results.forEach((r, idx) => {
      const s60 = r.sizes[60];
      const s85 = r.sizes[85];
      const s120 = r.sizes[120];
      ledger += `| ${idx + 1} | ${r.productId} | **${r.productName}** | ${r.fragranceName} (฿${r.fragrancePrice.toFixed(2)}) | ฿${s60.totalBomCost.toFixed(2)} (${s60.marginPercent}%) | ฿${s85.totalBomCost.toFixed(2)} (${s85.marginPercent}%) | ฿${s120.totalBomCost.toFixed(2)} (${s120.marginPercent}%) |\n`;
    });

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

main().catch(console.error);