// Internal data matrix updated with state-regulated minimums and mathematical averages
const stateRatesPerPound = {
  CA: { name: "California", aluminum: 1.66, glass: 0.101, plastic_pet: 1.46 }, // Legally fixed by CalRecycle
  OR: { name: "Oregon", aluminum: 3.11, glass: 0.20, plastic_pet: 2.45 },     // $0.10 rate conversion
  MI: { name: "Michigan", aluminum: 3.11, glass: 0.20, plastic_pet: 2.45 },   // $0.10 rate conversion
  CT: { name: "Connecticut", aluminum: 3.11, glass: 0.20, plastic_pet: 2.45 },// $0.10 rate conversion
  NY: { name: "New York", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 },   // $0.05 rate conversion
  HI: { name: "Hawaii", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 },     // $0.05 rate conversion
  IA: { name: "Iowa", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 },       // $0.05 rate conversion
  MA: { name: "Massachusetts", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 },// $0.05 rate conversion
  VT: { name: "Vermont", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 },     // $0.05 rate conversion
  ME: { name: "Maine", aluminum: 1.55, glass: 0.10, plastic_pet: 1.22 }       // Base $0.05 (Note: Maine liquor is $0.15, but mostly sorted manually by count)
};

/**
 * Calculates the total value based on user inputs
 * @param {string} stateCode - Two letter state code (e.g. 'CA')
 * @param {Array} materialsInput - Array of objects containing { type: 'aluminum', weight: 10.5 }
 * @returns {Object} Breakdown of individual costs and the final total sum
 */
function calculateRedemptionTotal(stateCode, materialsInput) {
  const selectedState = stateRatesPerPound[stateCode.toUpperCase()];
  
  if (!selectedState) {
    return { error: "State not supported or does not have a deposit law." };
  }

  let grandTotal = 0;
  const breakdown = [];

  materialsInput.forEach(item => {
    const materialType = item.type.toLowerCase();
    const weight = parseFloat(item.weight) || 0;
    
    // Pull the rate per pound from our state data matrix
    const ratePerPound = selectedState[materialType];

    if (ratePerPound && weight > 0) {
      const itemSubtotal = weight * ratePerPound;
      grandTotal += itemSubtotal;
      
      breakdown.push({
        material: materialType,
        weight: weight,
        rateApplied: ratePerPound,
        subtotal: parseFloat(itemSubtotal.toFixed(2))
      });
    }
  });

  return {
    state: selectedState.name,
    lineItems: breakdown,
    totalPayout: parseFloat(grandTotal.toFixed(2)) // Round cleanly to normal currency format
  };
}

// --- Example Frontend Usage Simulation ---
const userState = "CA";
const userMaterials = [
  { type: "aluminum", weight: 12.5 },
  { type: "plastic_pet", weight: 5.2 }
];

console.log(calculateRedemptionTotal(userState, userMaterials));