export interface PileCapGeometry {
  // Pile cap dimensions
  length: number;  // ft (X-direction)
  width: number;   // ft (Z-direction)
  depth: number;   // in (pile cap thickness)
  soilCover: number; // ft

  // Column dimensions  
  columnLength: number;  // in (X-direction)
  columnWidth: number;   // in (Z-direction)
  columnOffsetX: number; // ft
  columnOffsetZ: number; // ft

  // Pile configuration
  pileRows: number;
  pileColumns: number;
  pileSpacingX: number;  // ft
  pileSpacingY: number;  // ft

  // Pile properties
  pileType: 'Round' | 'Square';
  pileSize: number;  // in (diameter for round, side for square)
  pileEdgeDistance: number;  // ft
  pileTopEmbed: number;  // in
  accidentalOffset: number;  // in

  // Pile capacities
  pileCompressionCapacity: number;  // kips
  pileTensionCapacity: number;      // kips
  pileLateralCapacity: number;      // kips

  // Cover
  coverTop: number;     // in
  coverBottom: number;  // in
}

export interface LoadCase {
  id: string;
  name: string;
  deadLoad: number;        // D (kips)
  liveLoad: number;        // L (kips)
  roofLiveLoad: number;    // Lr (kips)
  snowLoad: number;        // S (kips)
  rainLoad: number;        // R (kips)
  seismicLoad: number;     // E (kips)
  windLoad: number;        // W (kips)
  momentX: number;         // ft-kips
  momentY: number;         // ft-kips
  shearX: number;          // kips
  shearY: number;          // kips
}

export interface LoadInputs {
  cases: LoadCase[];
  activeLoadCase: string;
}

export interface LoadCombinationResult {
  combinationName: string;
  axialLoad: number;
  momentX: number;
  momentY: number;
  shearX: number;
  shearY: number;
  caseId: string;
}

export interface MaterialProperties {
  // Concrete
  fc: number;  // psi

  // Rebar
  fy: number;  // psi

  // Reduction factors
  phiFlexure: number;
  phiShear: number;
  phiBearing: number;
}

export interface DesignParameters {
  designMethod: 'ASD' | 'LRFD';
  loadCombination: string;
  codeYear: string;
}

export interface PileReaction {
  x: number;  // ft from left edge
  y: number;  // ft from bottom edge
  reaction: number;  // kips
  pileNumber: number;
}

export interface ShearCheckResult {
  type: string;
  demand: number;
  capacity: number;
  ratio: number;
  pass: boolean;
  location: string;
}

export interface FlexuralDesignResult {
  direction: 'X' | 'Y';
  moment: number;  // kip-ft
  requiredAs: number;  // in^2
  providedAs: number;  // in^2
  minAs: number; // in^2
  barSize: string;
  barCount: number;
  spacing: number;  // in
  developmentLength: {
    required: number; // in
    available: number; // in
    pass: boolean;
  };
  pass: boolean;
}

export interface CalculationResults {
  pileReactions: PileReaction[];
  maxPileReaction: number;
  minPileReaction: number;

  shearChecks: ShearCheckResult[];

  flexuralX: FlexuralDesignResult;
  flexuralY: FlexuralDesignResult;

  bearingChecks: {
    columnBearing: {
      demand: number; // kips
      capacity: number; // kips
      ratio: number;
      pass: boolean;
      requiredDowels: number; // in^2
    };
    pileBearing: {
      demand: number; // kips
      capacity: number; // kips
      ratio: number;
      pass: boolean;
    };
  };

  columnDesign: {
    capacityX: number; // k-ft
    capacityY: number; // k-ft
    demandX: number; // k-ft
    demandY: number; // k-ft
    axialLoad: number; // kips
    ratio: number;
    pass: boolean;
    interactionPointsX: { m: number, p: number }[];
    interactionPointsY: { m: number, p: number }[];
  };

  governingCombination: string;
  governingCaseId: string;

  overallPass: boolean;
}

export interface ReinforcementConfig {
  // Top mat
  hasTopMat: boolean;
  topConcreteCover: number;  // in
  topXBarSize: string;  // e.g., "#8"
  topXBarCount: number;
  topXBarHooks: boolean;
  topZBarSize: string;
  topZBarCount: number;
  topZBarHooks: boolean;

  // Bottom mat
  hasBottomMat: boolean;
  bottomConcreteCover: number;  // in
  bottomXBarSize: string;
  bottomXBarCount: number;
  bottomXBarHooks: boolean;
  bottomZBarSize: string;
  bottomZBarCount: number;
  bottomZBarHooks: boolean;

  // Column longitudinal bars
  columnBarSize: string;
  columnBarCount: number;
}