import { Elysia, t } from "elysia";
import prisma from "../lib/prisma";

export const ordersRoute = new Elysia({ prefix: "/orders" })
  .get("/", async () => {
    return await prisma.order.findMany({
      orderBy: { createdAt: 'desc' },
      include: { items: true, customer: true }
    });
  })
  .get("/:id", async ({ params: { id }, set }) => {
    const order = await prisma.order.findUnique({
      where: { id: Number(id) },
      include: { items: true, customer: true }
    });
    if (!order) {
      set.status = 404;
      return { error: "Order not found" };
    }
    return order;
  })
  .post("/", async ({ body, set }) => {
    try {
      const data = body as any;
      const settings = await prisma.storeSettings.findFirst()
      const earnRate = settings?.pointsEarnRate || 1.0
      const netAmount = data.totalAmount - data.shippingFee
      const pointsEarned = Math.floor(Math.max(0, netAmount) * earnRate)

      if (data.customerId && data.pointsUsed && data.pointsUsed > 0) {
        // Verify customer has enough points
        const customer = await prisma.customer.findUnique({ where: { id: data.customerId } })
        if (!customer || customer.points < data.pointsUsed) {
          set.status = 400
          return { error: "Insufficient points" }
        }
        // Deduct points immediately
        await prisma.customer.update({
          where: { id: data.customerId },
          data: { points: { decrement: data.pointsUsed } }
        })
      }

      const order = await prisma.order.create({
        data: {
          customerId: data.customerId,
          customerName: data.customerName,
          customerEmail: data.customerEmail,
          customerPhone: data.customerPhone,
          shippingAddress: data.shippingAddress,
          subtotal: data.subtotal || 0,
          promoLevel1Name: data.promoLevel1Name,
          promoLevel1Disc: data.promoLevel1Disc || 0,
          promoLevel2Name: data.promoLevel2Name,
          promoLevel2Disc: data.promoLevel2Disc || 0,
          couponCode: data.couponCode || null,
          discountAmount: data.discountAmount || 0,
          pointsUsed: data.pointsUsed || 0,
          pointsDiscount: data.pointsDiscount || 0,
          pointsEarned: pointsEarned,
          shippingFee: data.shippingFee,
          totalAmount: data.totalAmount,
          items: {
            create: data.items.map((item: any) => ({
              productId: item.productId,
              variantId: item.variantId,
              quantity: item.quantity,
              priceAtPurchase: item.priceAtPurchase,
              productName: item.productName,
              variantSize: item.variantSize,
              productImage: item.productImage
            }))
          }
        },
        include: { items: true }
      });
      
      // If a coupon was used, increment its usedCount
      if (data.couponCode) {
        try {
          await prisma.coupon.update({
            where: { code: data.couponCode.toUpperCase() },
            data: { usedCount: { increment: 1 } }
          });
        } catch (e) {
          console.error("Failed to increment coupon usedCount:", e);
        }
      }
      
      return order;
    } catch (err) {
      console.error("[Orders] Error:", err);
      set.status = 500;
      return { error: "Failed to create order" };
    }
  }, {
    body: t.Object({
      customerId: t.Optional(t.Nullable(t.Number())),
      customerName: t.String(),
      customerEmail: t.String(),
      customerPhone: t.String(),
      shippingAddress: t.String(),
      totalAmount: t.Number(),
      shippingFee: t.Number(),
      subtotal: t.Optional(t.Number()),
      promoLevel1Name: t.Optional(t.Nullable(t.String())),
      promoLevel1Disc: t.Optional(t.Number()),
      promoLevel2Name: t.Optional(t.Nullable(t.String())),
      promoLevel2Disc: t.Optional(t.Number()),
      couponCode: t.Optional(t.Nullable(t.String())),
      discountAmount: t.Optional(t.Number()),
      pointsUsed: t.Optional(t.Number()),
      pointsDiscount: t.Optional(t.Number()),
      items: t.Array(t.Object({
        productId: t.Number(),
        variantId: t.Optional(t.Number()),
        quantity: t.Number(),
        priceAtPurchase: t.Number(),
        productName: t.String(),
        variantSize: t.Optional(t.String()),
        productImage: t.Optional(t.String())
      }))
    })
  })
  .patch("/:id/status", async ({ params: { id }, body, set }) => {
    try {
      const { status } = body as any;
      const order = await prisma.order.findUnique({ where: { id: Number(id) } });
      
      const updatedOrder = await prisma.order.update({
        where: { id: Number(id) },
        data: { status },
        include: { items: true }
      });

      // Grant points if status becomes PAID and it wasn't PAID before
      if (status === 'PAID' && order?.status !== 'PAID' && order?.customerId && order?.pointsEarned > 0) {
        await prisma.customer.update({
          where: { id: order.customerId },
          data: { points: { increment: order.pointsEarned } }
        });
      }

      // If status becomes CANCELLED, refund the points used
      if (status === 'CANCELLED' && order?.status !== 'CANCELLED' && order?.customerId && order?.pointsUsed > 0) {
        await prisma.customer.update({
          where: { id: order.customerId },
          data: { points: { increment: order.pointsUsed } }
        });
      }

      return updatedOrder;
    } catch (err) {
      set.status = 500;
      return { error: "Failed to update order status" };
    }
  }, {
    body: t.Object({
      status: t.String()
    })
  })
  .patch("/:id/slip", async ({ params: { id }, body, set }) => {
    try {
      const { paymentSlipUrl } = body as any;
      return await prisma.order.update({
        where: { id: Number(id) },
        data: { paymentSlipUrl },
        include: { items: true }
      });
    } catch (err) {
      set.status = 500;
      return { error: "Failed to upload slip" };
    }
  }, {
    body: t.Object({
      paymentSlipUrl: t.String()
    })
  })
  .patch("/:id/tracking", async ({ params: { id }, body, set }) => {
    try {
      const { trackingNo } = body as any;
      return await prisma.order.update({
        where: { id: Number(id) },
        data: { trackingNo },
        include: { items: true }
      });
    } catch (err) {
      set.status = 500;
      return { error: "Failed to update tracking number" };
    }
  }, {
    body: t.Object({
      trackingNo: t.String()
    })
  })
  .get("/customer/:customerId", async ({ params: { customerId } }) => {
    return await prisma.order.findMany({
      where: { customerId: Number(customerId) },
      orderBy: { createdAt: 'desc' },
      include: { items: true }
    });
  })
  .post("/track", async ({ body, set }) => {
    try {
      const { orderId, phone } = body as any;
      const order = await prisma.order.findUnique({
        where: { id: Number(orderId) }
      });
      if (!order) {
        set.status = 404;
        return { error: "Order not found" };
      }
      
      const sanitizePhone = (p: string) => p.replace(/[^0-9]/g, '');
      if (sanitizePhone(order.customerPhone) !== sanitizePhone(phone)) {
        set.status = 401;
        return { error: "Authentication failed. Phone number does not match." };
      }
      
      return { success: true, orderId: order.id };
    } catch (err) {
      set.status = 500;
      return { error: "Invalid tracking request" };
    }
  }, {
    body: t.Object({
      orderId: t.Number(),
      phone: t.String()
    })
  });