import React, { useState, useEffect } from "react";


const sldHeader = `
<?xml version="1.0" encoding="UTF-8"?>
<StyledLayerDescriptor version="1.0.0"
  xmlns="http://www.opengis.net/sld"
  xmlns:ogc="http://www.opengis.net/ogc"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.opengis.net/sld
  http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
`;
const sldFooter = `</StyledLayerDescriptor>`;
const singleColorSLD = (color, geometryType) => `
${sldHeader}
  <NamedLayer>
    <Name>layer</Name>
    <UserStyle>
      <FeatureTypeStyle>
        <Rule>
          ${symbolizer(geometryType, color)}
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
${sldFooter}
`;
const uniqueValueSLD = (column, rules, geometryType) => `
${sldHeader}
  <NamedLayer>
    <Name>layer</Name>
    <UserStyle>
      <FeatureTypeStyle>
        ${rules.map(r => `
          <Rule>
            <ogc:Filter>
              <ogc:PropertyIsEqualTo>
                <ogc:PropertyName>${column}</ogc:PropertyName>
                <ogc:Literal>${r.value}</ogc:Literal>
              </ogc:PropertyIsEqualTo>
            </ogc:Filter>
            ${symbolizer(geometryType, r.color)}
          </Rule>
        `).join("")}
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
${sldFooter}
`;
const globalIconSLD = (iconCode) => `
${sldHeader}
  <NamedLayer>
    <Name>layer</Name>
    <UserStyle>
      <FeatureTypeStyle>
        <Rule>
          <PointSymbolizer>
            <Graphic>
              <ExternalGraphic>
                <OnlineResource
                  xlink:type="simple"
                  xlink:href="${iconCode}"/>
                <Format>image/png</Format>
              </ExternalGraphic>
              <Size>10</Size>
            </Graphic>
          </PointSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
${sldFooter}
`;

const symbolizer = (geometryType, color) => {
  if (geometryType.toUpperCase() === "POINT" || geometryType.toUpperCase() === "MULTIPOINT") {
    return `
      <PointSymbolizer>
        <Graphic>
          <Mark>
            <WellKnownName>circle</WellKnownName>
            <Fill>
              <CssParameter name="fill">${color}</CssParameter>
            </Fill>
            <Stroke>
              <CssParameter name="stroke">#000000</CssParameter>
              <CssParameter name="stroke-width">2</CssParameter>
            </Stroke>
          </Mark>
          <Size>10</Size>
        </Graphic>
      </PointSymbolizer>
    `;
  }

  if (geometryType === "line") {
    return `
      <LineSymbolizer>
        <Stroke>
          <CssParameter name="stroke">${color}</CssParameter>
          <CssParameter name="stroke-width">2</CssParameter>
        </Stroke>
      </LineSymbolizer>
    `;
  }

  return `
      <PolygonSymbolizer>
        <Fill>
          <CssParameter name="fill">${color}</CssParameter>
          <CssParameter name="fill-opacity">0.5</CssParameter>
        </Fill>
        <Stroke>
          <CssParameter name="stroke">#232323</CssParameter>
        </Stroke>
      </PolygonSymbolizer>
    `;
};




// const randomColor = () =>
//   "#" + Math.floor(Math.random() * 16777215).toString(16);
const randomColor = () => {
  let color = "#000000"

  while (color === "#000000") {
    color =
      "#" + Math.floor(Math.random() * 16777215)
        .toString(16)
        .padStart(6, "0")
  }

  return color
}


const CustomLayerStyle = ({ data = [], geometryType, onSubmit, onChange }) => {
  const [columns, setColumns] = useState([]);
  const [selectedStyle, setSelectedStyle] = useState("single");

  // STYLE STATE
  const [singleColor, setSingleColor] = useState("#3388ff");

  const [uniqueColumn, setUniqueColumn] = useState("");
  const [uniqueRules, setUniqueRules] = useState([]);

  const [randomRules, setRandomRules] = useState([]);

  const [propColumn, setPropColumn] = useState("");
  const [propMin, setPropMin] = useState(3);
  const [propMax, setPropMax] = useState(12);

  const [iconMode, setIconMode] = useState("global"); // global | per-feature
  const [iconGlobal, setIconGlobal] = useState("");
  const [iconRules, setIconRules] = useState([]);

  // Extract columns
  useEffect(() => {
    if (data.length > 0) {
      const keys = Object.keys(data[0]).filter((k) => k !== "geometry");
      setColumns(keys);
    }
  }, [data]);

  useEffect(() => {
    onChange({
      type: selectedStyle,
      color: singleColor,
      unique: uniqueRules,
      random: randomRules,
      proportional: { propColumn, propMin, propMax }
    });
  }, [selectedStyle, singleColor, uniqueRules, randomRules, propColumn, propMin, propMax]);


  // Handle unique value column selection
  const generateUniqueRules = (column) => {
    const values = [...new Set(data.map((d) => d[column]))];

    const rules = values.map((v) => ({
      value: v,
      color: randomColor(),
    }));

    setUniqueRules(rules);
  };

  // Handle random per row
  const generateRandomRules = () => {
    const rules = data.map((row) => ({
      id: row.id,
      color: randomColor(),
    }));
    setRandomRules(rules);
  };

  // Handle icon rules
  const generateIconRules = () => {
    const rules = data.map((row) => ({
      id: row.id,
      iconUrl: "",
    }));
    setIconRules(rules);
  };

  async function generateBase64(iconUrl) {
    const response = await fetch(iconUrl, {
      mode: "cors",
    });

    const blob = await response.blob();

    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.onloadend = () => resolve(reader.result);
      reader.onerror = reject;
      reader.readAsDataURL(blob);
    });
  }


  // Final Submit
  const submit = async () => {
    let xml = "";

    if (selectedStyle === "single") {
      xml = singleColorSLD(singleColor, geometryType);
    }

    if (selectedStyle === "unique_value") {
      xml = uniqueValueSLD(uniqueColumn, uniqueRules, geometryType);
    }

    if (selectedStyle === "icon") {
      // const iconCode = await generateBase64('https://cdn-icons-png.flaticon.com/512/0/614.png')
      const iconCode = 'https://cdn-icons-png.flaticon.com/512/0/614.png'
      xml = globalIconSLD(iconCode);
    }

    // xml = ``
    
    onSubmit({
      styleType: "sld",
      sldContent: xml
    });
  };


  return (
    <div className="bg-white relative p-4 pb-0 rounded shadow h-full overflow-auto">
        <h5 className="font-bold mb-3">🎨 Pengaturan Styling Data Spasial</h5>

        {/* PILIH STYLE */}
        <div className="mb-3">
            <label className="font-semibold block mb-1">Jenis Styling</label>
            <select
                className="w-full border rounded p-2"
                value={selectedStyle}
                onChange={(e) => setSelectedStyle(e.target.value)}
            >
            <option value="single">Single Color</option>
            <option value="unique_value">Unique Value (Kategori)</option>
            {/* <option value="random">Random per Feature</option> */}
            {/* <option value="proportional">Proportional (Ukuran)</option> */}
            {geometryType === "Point" && <option value="icon">Icon per Feature</option>}
            </select>
        </div>

        {/* ---------------- SINGLE COLOR ---------------- */}
        {selectedStyle === "single" && (
            <div className="mb-3">
            <label className="font-semibold block mb-1">Pilih Warna</label>
            <input
                type="color"
                className="w-16 h-10 p-1 border rounded"
                value={singleColor}
                onChange={(e) => setSingleColor(e.target.value)}
            />
            </div>
        )}

        {/* ---------------- UNIQUE VALUE ---------------- */}
        {selectedStyle === "unique_value" && (
            <div className="mb-3">
            <label className="font-semibold block mb-1">Pilih Kolom Kategori</label>
            <select
                className="w-full border rounded p-2"
                onChange={(e) => {
                setUniqueColumn(e.target.value);
                generateUniqueRules(e.target.value);
                }}
            >
                <option value="">-- pilih kolom --</option>
                {columns.map((c) => (
                <option key={c}>{c}</option>
                ))}
            </select>

            {/* RULE LIST */}
            <div className="mt-3">
                {uniqueRules.map((r, i) => (
                <div key={i} className="flex items-center mb-2">
                    <div className="w-36 mr-2">{r.value}</div>
                    <input
                    type="color"
                    className="w-12 h-8 border rounded"
                    value={r.color}
                    onChange={(e) => {
                        const copy = [...uniqueRules];
                        copy[i].color = e.target.value;
                        setUniqueRules(copy);
                    }}
                    />
                </div>
                ))}
            </div>
            </div>
        )}

        {/* ---------------- RANDOM COLOR ---------------- */}
        {selectedStyle === "random" && (
            <div className="mb-3">
            <button
                className="bg-gray-600 text-white px-3 py-2 rounded mb-2"
                onClick={generateRandomRules}
            >
                Generate Random Colors
            </button>

            {randomRules.map((r, i) => (
                <div key={i} className="flex items-center mb-2">
                <span className="mr-2">ID {r.id}</span>
                <input
                    type="color"
                    className="w-12 h-8 border rounded"
                    value={r.color}
                    onChange={(e) => {
                    const copy = [...randomRules];
                    copy[i].color = e.target.value;
                    setRandomRules(copy);
                    }}
                />
                </div>
            ))}
            </div>
        )}

        {/* ---------------- PROPORTIONAL ---------------- */}
        {selectedStyle === "proportional" && (
          <div className="mb-3">
            <label className="font-semibold block mb-1">Pilih Kolom Angka</label>
            <select
                className="w-full border rounded p-2 mb-2"
                onChange={(e) => setPropColumn(e.target.value)}
            >
                <option value="">-- pilih kolom --</option>
                {columns.map((c) => {
                const isNumber = typeof data[0][c] === "number";
                return isNumber && <option key={c}>{c}</option>;
                })}
            </select>

            <div className="mb-2">
                <label className="block mb-1">Ukuran Minimum</label>
                <input
                type="number"
                className="w-full border rounded p-2"
                value={propMin}
                onChange={(e) => setPropMin(Number(e.target.value))}
                />
            </div>

            <div>
                <label className="block mb-1">Ukuran Maksimum</label>
                <input
                type="number"
                className="w-full border rounded p-2"
                value={propMax}
                onChange={(e) => setPropMax(Number(e.target.value))}
                />
            </div>
          </div>
        )}

        {/* ---------------- ICON PER FEATURE ---------------- */}
        {selectedStyle === "icon" && geometryType === "Point" && (
            <div className="mb-3">
            <label className="block mb-1">Masukkan URL Icon</label>
            <input
                type="text"
                className="w-full border rounded p-2"
                placeholder="https://example.com/icon.png"
                value={iconGlobal}
                onChange={(e) => setIconGlobal(e.target.value)}
            />
            </div>
        )}

        <div className="sticky bottom-0 bg-white pt-2">
          <button
              className="bg-blue-600 hover:bg-blue-700 text-white w-full py-1 rounded"
              onClick={submit}
          >
              Terapkan
          </button>
        </div>
    </div>

  );
};

export default CustomLayerStyle;