import React, { useState } from "react";
import {
  FaCalendar,
  FaBullseye, // Keep for icon consistency if needed elsewhere
} from "react-icons/fa";
import {
  MrpMaterialRequirement,
  RequirementSourceTypeEnum,
} from "../../../types/mrp";
import DataTable, { Column } from "../../../components/common/DataTable";
import {
  getRequirementSourceTypeColor,
  getRequirementSourceTypeText,
} from "../../../utils/erp";

interface MaterialRequirementsProps {
  materialRequirements: MrpMaterialRequirement[];
}

const MaterialRequirements: React.FC<MaterialRequirementsProps> = ({
  materialRequirements,
}) => {
  const [searchTerm, setSearchTerm] = useState("");
  const [selectedSource, setSelectedSource] = useState<
    RequirementSourceTypeEnum | "all"
  >("all");
  const [sortBy, setSortBy] = useState<"date" | "quantity" | "priority">(
    "date"
  );

  // Event handlers
  const handleViewDetails = (requirement: MrpMaterialRequirement) => {
    console.log("View requirement details:", requirement);
  };

  const filteredRequirements = materialRequirements
    .filter((req) => {
      if (
        searchTerm &&
        !req.material?.name?.toLowerCase().includes(searchTerm.toLowerCase()) &&
        !req.material?.code?.toLowerCase().includes(searchTerm.toLowerCase())
      ) {
        return false;
      }
      if (selectedSource !== "all" && req.sourceType !== selectedSource) {
        return false;
      }
      return true;
    })
    .sort((a, b) => {
      switch (sortBy) {
        case "date":
          return (
            new Date(a.requirementDate).getTime() -
            new Date(b.requirementDate).getTime()
          );
        case "quantity":
          return b.netRequirement - a.netRequirement;
        case "priority":
          return b.grossRequirement - a.grossRequirement;
        default:
          return 0;
      }
    });

  const getUrgencyLevel = (requirement: MrpMaterialRequirement) => {
    const today = new Date();
    const reqDate = new Date(requirement.requirementDate);
    const daysUntilRequired = Math.ceil(
      (reqDate.getTime() - today.getTime()) / (1000 * 60 * 60 * 24)
    );

    if (daysUntilRequired < 0)
      return {
        level: "overdue",
        color: "bg-red-100 text-red-800",
        label: "Gecikmiş",
      };
    if (daysUntilRequired <= 7)
      return {
        level: "urgent",
        color: "bg-orange-100 text-orange-800",
        label: "Acil",
      };
    if (daysUntilRequired <= 30)
      return {
        level: "soon",
        color: "bg-yellow-100 text-yellow-800",
        label: "Yakın",
      };
    return {
      level: "normal",
      color: "bg-green-100 text-green-800",
      label: "Normal",
    };
  };

  const requirementColumns: Column<MrpMaterialRequirement>[] = [
    {
      key: "material",
      header: "Malzeme",
      sortable: true,
      render: (req: MrpMaterialRequirement) => (
        <div>
          <div className="font-medium text-gray-900">
            {req.material?.name || `Material-${req.materialId.substring(0, 8)}`}
          </div>
          <div className="text-sm text-gray-500">{req.material?.code}</div>
        </div>
      ),
    },
    {
      key: "sourceType",
      header: "Kaynak",
      render: (req: MrpMaterialRequirement) => (
        <span
          className={`px-2 py-1 text-xs font-medium rounded-full ${getRequirementSourceTypeColor(
            req.sourceType
          )}`}
        >
          {getRequirementSourceTypeText(req.sourceType)}
        </span>
      ),
    },
    {
      key: "urgency",
      header: "Aciliyet",
      render: (req: MrpMaterialRequirement) => {
        const urgency = getUrgencyLevel(req);
        return (
          <span
            className={`px-2 py-1 text-xs font-medium rounded-full ${urgency.color}`}
          >
            {urgency.label}
          </span>
        );
      },
    },
    {
      key: "requirements",
      header: "İhtiyaçlar",
      render: (req: MrpMaterialRequirement) => (
        <div className="text-sm">
          <div className="flex justify-between">
            <span>Brüt:</span>
            <span className="font-medium">
              {req.grossRequirement.toLocaleString()}
            </span>
          </div>
          <div className="flex justify-between">
            <span>Mevcut:</span>
            <span className="font-medium">
              {req.projectedAvailable.toLocaleString()}
            </span>
          </div>
          <div className="flex justify-between border-t pt-1">
            <span>Net:</span>
            <span
              className={`font-medium ${
                req.netRequirement > 0 ? "text-red-600" : "text-green-600"
              }`}
            >
              {req.netRequirement.toLocaleString()}
            </span>
          </div>
        </div>
      ),
    },
    {
      key: "scheduled",
      header: "Planlanan",
      render: (req: MrpMaterialRequirement) => (
        <div className="text-sm">
          <div>Gelen: {req.scheduledReceipts.toLocaleString()}</div>
          <div>Sipariş: {req.plannedOrderReceipt.toLocaleString()}</div>
        </div>
      ),
    },
    {
      key: "dates",
      header: "Tarihler",
      render: (req: MrpMaterialRequirement) => (
        <div className="text-sm">
          <div className="flex items-center gap-1">
            <FaCalendar className="w-3 h-3 text-gray-400" />
            <span>
              İhtiyaç:{" "}
              {new Date(req.requirementDate).toLocaleDateString("tr-TR")}
            </span>
          </div>
          <div className="flex items-center gap-1">
            <FaBullseye className="w-3 h-3 text-gray-400" />
            <span>
              Plan:{" "}
              {new Date(req.plannedReceiptDate).toLocaleDateString("tr-TR")}
            </span>
          </div>
        </div>
      ),
    },
    {
      key: "actions",
      header: "İşlemler",
      render: (req: MrpMaterialRequirement) => (
        <button
          onClick={() => handleViewDetails(req)}
          className="px-3 py-1 text-sm bg-blue-50 text-blue-600 rounded hover:bg-blue-100 transition-colors"
        >
          Detay
        </button>
      ),
    },
  ];

  return (
    <>
      {/* Filters */}
      <div className="flex gap-2 items-center">
        <div className="flex-1">
          <input
            type="text"
            placeholder="Malzeme adı veya kodu ara..."
            value={searchTerm}
            onChange={(e) => setSearchTerm(e.target.value)}
            className="w-full px-2 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
          />
        </div>

        <select
          value={selectedSource}
          onChange={(e) =>
            setSelectedSource(
              e.target.value as RequirementSourceTypeEnum | "all"
            )
          }
          className="px-2 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
        >
          <option value="all">Tüm Kaynaklar</option>
          {Object.values(RequirementSourceTypeEnum).map((source) => (
            <option key={source} value={source}>
              {getRequirementSourceTypeText(source)}
            </option>
          ))}
        </select>

        <select
          value={sortBy}
          onChange={(e) =>
            setSortBy(e.target.value as "date" | "quantity" | "priority")
          }
          className="px-2 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
        >
          <option value="date">Tarihe Göre</option>
          <option value="quantity">Miktara Göre</option>
          <option value="priority">Önceliğe Göre</option>
        </select>
      </div>

      {/* Data Table */}
      <div className="bg-white rounded-lg shadow-sm border">
        <DataTable data={filteredRequirements} columns={requirementColumns} />
      </div>
    </>
  );
};

export default MaterialRequirements;