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enum EvalLabel {
    PASS = "PASS",
    FAIL = "FAIL"
}

interface EvalResult {
    label: EvalLabel;
    rationale?: string;
}

import { z } from 'zod';
import { MAX_WORD_COUNT } from './app.config';

const hexColorRegex = /^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/;

// Reusable schema for hex colors
const HexColor = z.string().regex(hexColorRegex, { message: "Invalid hex color code" });

// zod schema definition for AppOutput
export const AppOutputSchema = z.object({
  motto: z.string().min(1, { message: "Motto is missing or empty" }).refine((val) => {
    const words = val.replace(/[^\w\s]|_/g, "").trim();
    const count = words ? words.split(/\s+/).length : 0;
    return count > 0 && count <= MAX_WORD_COUNT;
  }, { message: `Motto must be between 1 and ${MAX_WORD_COUNT} words` }),
  colorPalette: z.object({
    textColor: HexColor,
    backgroundColor: HexColor,
    primary: HexColor,
    secondary: HexColor
  }).catchall(HexColor)
});

/*
 * Input: ColorPalette {"textColor":"#333333","backgroundColor":"#000000", ...}
 * Output: EvalResult {"status":"FAIL","rationale":"Contrast ratio is 1.66:1 (must be >= 4.5:1)."}
 * minContrastRatio is an app config variable, MIN_CONTRAST_RATIO = 4.5
*/
export function evalContrastRatio(colorPalette: ColorPalette, minContrastRatio: number): EvalResult {
  if (!colorPalette || !colorPalette.textColor || !colorPalette.backgroundColor) {
    return { status: EvalLabel.FAIL, rationale: "Missing textColor or backgroundColor." };
  }
  try {
    const ratio = getContrastRatio(colorPalette.textColor, colorPalette.backgroundColor);
    const rationale = `Contrast ratio is ${ratio.toFixed(2)}:1 (must be >= ${minContrastRatio}:1).`;
    if (ratio < minContrastRatio) {
      return { status: EvalLabel.FAIL, rationale };
    }
    return { status: EvalLabel.PASS, rationale };
  } catch (e) {
    return { status: EvalLabel.FAIL, rationale: "Could not calculate contrast ratio (invalid hex?)." };
  }
}

import { MIN_CONTRAST_RATIO } from '../src/app.config'; // 4.5

const testCases = [
  {
  // ...
      appOutput: {
        motto: "Test motto",
        colorPalette: {
          textColor: "#333333",
          backgroundColor: "#000000",
          primary: "#FF0000",
          secondary: "#333333"
        }
      },
    expected: {
      // Dark grey on black (low contrast): FAIL
      contrast: EvalLabel.FAIL
    }
  }
  // ... more test cases
];

testCases.forEach((testCase) => {
  const result = evalContrastRatio(
    testCase.appOutput.colorPalette as any, MIN_CONTRAST_RATIO
  );
  const actualEvalLabel = result.label;
  const expectedEvalLabel = testCase.expected.contrast;
  const isSuccess = actualEvalLabel === expectedEvalLabel;
 // ...
});