import React, { useState, useEffect } from "react";
import Papa from "papaparse";
import { config as envConfig, debugLog } from "../utils/config";

const Step3 = ({
  uploadedFile,
  fileMetadata,
  config,
  setConfig,
  stepNumber,
  stepTitle,
  stepIcon,
  enabled = true,
  // Add validation props
  apiKey,
  isApiKeyValid,
  s3Link,
}) => {
  const [columns, setColumns] = useState([]);

  useEffect(() => {
    if (uploadedFile) {
      debugLog("Parsing uploaded file for columns", {
        fileName: uploadedFile.name,
      });

      // Parse the uploaded file to get column names
      Papa.parse(uploadedFile, {
        complete: (results) => {
          if (results.data.length > 0) {
            const headers = Object.keys(results.data[0]);
            setColumns(headers);
            debugLog("Columns extracted from file", { columns: headers });

            // Set first column as default target if not already set
            if (!config.targetColumn && headers.length > 0) {
              setConfig((prev) => ({
                ...prev,
                targetColumn: headers[0],
                fileSizeBytes: fileMetadata?.fileSizeBytes || 0,
                sourceFileRows: fileMetadata?.sourceFileRows || 0,
              }));
            }

            // Set default number of rows from environment config if not already set
            if (!config.numRows || config.numRows === 100) {
              setConfig((prev) => ({
                ...prev,
                numRows: envConfig.defaultNumRecords,
                fileSizeBytes: fileMetadata?.fileSizeBytes || 0,
                sourceFileRows: fileMetadata?.sourceFileRows || 0,
              }));
              debugLog("Set default number of rows", {
                numRows: envConfig.defaultNumRecords,
              });
            }
          }
        },
        header: true,
        skipEmptyLines: true,
      });
    }
  }, [
    uploadedFile,
    config.targetColumn,
    config.numRows,
    setConfig,
    fileMetadata?.fileSizeBytes,
    fileMetadata?.sourceFileRows,
  ]);

  const handleNumRowsChange = (e) => {
    // Prevent action if step is disabled
    if (!enabled) return;

    const numRows = parseInt(e.target.value, 10);
    debugLog("Number of rows changed", { numRows });
    setConfig((prev) => ({
      ...prev,
      numRows: numRows,
      fileSizeBytes: fileMetadata?.fileSizeBytes || 0,
      sourceFileRows: fileMetadata?.sourceFileRows || 0,
    }));
  };

  const handleTargetColumnChange = (e) => {
    // Prevent action if step is disabled
    if (!enabled) return;

    const targetColumn = e.target.value;
    debugLog("Target column changed", { targetColumn });
    setConfig((prev) => ({
      ...prev,
      targetColumn: targetColumn,
      fileSizeBytes: fileMetadata?.fileSizeBytes || 0,
      sourceFileRows: fileMetadata?.sourceFileRows || 0,
    }));
  };

  return (
    <div className="step-container fade-in">
      <div className="step-header">
        <h2>
          <span className="step-number">{stepNumber}</span>
          {stepIcon} {stepTitle}
        </h2>
        <p>
          Configure the parameters for your synthetic data generation process
        </p>
      </div>

      <div className="step-body">
        <div className="config-section">
          <h3>
            <span className="config-icon">📊</span>
            Data Generation Settings
          </h3>

          <div className="form-group">
            <label htmlFor="numRows">Number of Rows to Generate</label>
            <div className="slider-container">
              <input
                id="numRows"
                type="range"
                min="10"
                max="1000"
                step="10"
                value={config.numRows}
                onChange={handleNumRowsChange}
                className="slider"
                disabled={false}
              />
              <div className="slider-value">{config.numRows} rows</div>
            </div>
          </div>

          <div className="form-group">
            <label htmlFor="targetColumn">Target Column</label>
            <select
              id="targetColumn"
              className="form-input"
              value={config.targetColumn}
              onChange={handleTargetColumnChange}
              disabled={columns.length === 0}
            >
              <option value="">Select a target column...</option>
              {columns.map((column, index) => (
                <option key={index} value={column}>
                  {column}
                </option>
              ))}
            </select>
          </div>
        </div>

        {columns.length > 0 && (
          <div className="config-section">
            <h3>
              <span className="config-icon">📋</span>
              Available Columns ({columns.length})
            </h3>
            <div
              style={{
                display: "flex",
                flexWrap: "wrap",
                gap: "0.5rem",
                marginTop: "1rem",
              }}
            >
              {columns.map((column, index) => (
                <span
                  key={index}
                  style={{
                    background:
                      config.targetColumn === column
                        ? "var(--primary-color)"
                        : "var(--bg-tertiary)",
                    color:
                      config.targetColumn === column
                        ? "white"
                        : "var(--text-secondary)",
                    padding: "0.5rem 0.75rem",
                    borderRadius: "6px",
                    fontSize: "0.8rem",
                    fontWeight: "500",
                    border:
                      config.targetColumn === column
                        ? "none"
                        : "1px solid var(--border-color)",
                  }}
                >
                  {column}
                </span>
              ))}
            </div>
          </div>
        )}
      </div>
    </div>
  );
};

export default Step3;