Function chooseRotationPlan

src/components/CropPlanningSection.tsx:1235–1283

(chosenProfiles: CropProfile[], signals: PlanningSignals)

  return `${profile.name} fits this ${priority} because the ${signals.soilClass.toLowerCase()} profile and pH ${roundTo(signals.soilPH)} align well with its rooting needs. Current NDVI is ${ndviLabel}, rainfall is ~${Math.round(signals.annualRainfall)}mm/year, and the field shows ${moistureLabel} water availability for ${profile.waterNeeds}-water cropping.`;
}

function chooseRotationPlan(chosenProfiles: CropProfile[], signals: PlanningSignals): RotationStep[] {
  const names = new Set(chosenProfiles.map((profile) => profile.name));
  const detectedRegions = detectRegion(signals.locationText);
  const isTropical = detectedRegions.includes("tropical");
  const isMediterranean = detectedRegions.includes("mediterranean");
  const isTemplateOrCont = detectedRegions.includes("temperate") || detectedRegions.includes("continental");

  const currentMonth = new Date().getMonth();

  if (isTropical) {
    const isKharif = currentMonth >= 5 && currentMonth <= 9;
    const isRabi = currentMonth >= 10 || currentMonth <= 2;
    const kharif = signals.annualRainfall > 1400 ? (names.has("Rice") ? "Rice" : names.has("Turmeric") ? "Turmeric" : "Maize") : names.has("Millet") ? "Millet" : "Groundnut";
    const rabi = signals.temperature < 22 ? (names.has("Wheat") ? "Wheat" : "Chickpea") : names.has("Chickpea") ? "Chickpea" : "Mustard";
    const zaid = names.has("Mung Bean") ? "Mung Bean" : names.has("Tomato") ? "Tomato" : "Groundnut";
    return [
      { season: `Kharif${isKharif ? " (Current)" : ""}`, months: "Jun-Oct", crops: [kharif, names.has("Black Pepper") ? "Black Pepper" : "Cover crop", "Mung Bean"] },
      { season: `Rabi${isRabi ? " (Current)" : ""}`, months: "Nov-Mar", crops: [rabi, names.has("Mustard") ? "Mustard" : "Lentil"] },
      { season: `Zaid${!isKharif && !isRabi ? " (Current)" : ""}`, months: "Mar-Jun", crops: [zaid, "Mung Bean"] },
    ];
  }

  if (isMediterranean) {
    const isWinter = currentMonth >= 10 || currentMonth <= 2;
    const isSpring = currentMonth >= 3 && currentMonth <= 5;
    const isSummer = currentMonth >= 6 && currentMonth <= 9;
    const winter = names.has("Wheat") ? "Wheat" : names.has("Barley") ? "Barley" : "Fava Bean";
    const spring = names.has("Chickpea") ? "Chickpea" : names.has("Lentil") ? "Lentil" : "Onion";
    const summer = names.has("Tomato") ? "Tomato" : names.has("Sunflower") ? "Sunflower" : names.has("Maize") ? "Maize" : "Grape";
    return [
      { season: `Winter${isWinter ? " (Current)" : ""}`, months: "Nov-Feb", crops: [winter, names.has("Fava Bean") ? "Fava Bean" : "Barley", "Garlic"] },
      { season: `Spring${isSpring ? " (Current)" : ""}`, months: "Mar-May", crops: [spring, names.has("Artichoke") ? "Artichoke" : "Onion"] },
      { season: `Summer${isSummer ? " (Current)" : ""}`, months: "Jun-Oct", crops: [summer, names.has("Grape") ? "Grape" : "Alfalfa"] },
    ];
  }

  // Temperate / Continental / default
  const isSpring = currentMonth >= 2 && currentMonth <= 4;
  const isSummer = currentMonth >= 5 && currentMonth <= 8;
  const isAutumn = currentMonth >= 9 && currentMonth <= 11;
  const spring = names.has("Wheat") ? "Wheat" : names.has("Barley") ? "Barley" : names.has("Oats") ? "Oats" : "Canola";
  const summer = names.has("Maize") ? "Maize" : names.has("Sunflower") ? "Sunflower" : names.has("Potato") ? "Potato" : "Sugar Beet";
  const autumn = names.has("Rye") ? "Rye" : names.has("Clover") ? "Clover" : "Field Pea";
  return [
    { season: `Spring${isSpring ? " (Current)" : ""}`, months: "Mar-May", crops: [spring, names.has("Field Pea") ? "Field Pea" : "Clover", "Oats"] },
    { season: `Summer${isSummer ? " (Current)" : ""}`, months: "Jun-Sep", crops: [summer, names.has("Potato") ? "Potato" : "Alfalfa"] },
    { season: `Autumn/Winter${isAutumn ? " (Current)" : ""}`, months: "Oct-Feb", crops: [autumn, "Cover crop"] },
  ];
}