export type RiskCategory = 'I' | 'II' | 'III' | 'IV';
export type ExposureCategory = 'B' | 'C' | 'D';
export type RoofType = 'Gable' | 'Monoslope';
export type EnclosureClassification = 'Enclosed' | 'Partially Enclosed';

export interface BuildingDimensions {
    ridgeHeight: number; // hr
    eaveHeight: number; // he
    width: number; // B
    length: number; // L
    roofType: RoofType;
}

export interface WindParameters {
    basicWindSpeed: number; // V
    exposureCategory: ExposureCategory;
    riskCategory: RiskCategory;
    enclosureClassification: EnclosureClassification;
    kzt: number;
    ke: number;
}

export interface CalculationResults {
    // Building Geometry
    meanRoofHeight: number; // h
    roofSlope: number; // theta (degrees)
    zoneWidth: number; // a

    // Velocity Pressure
    qh: number;
    qz: number; // At mean roof height
    kd: number; // Directionality factor
    kh: number; // Exposure coefficient

    // Coefficients
    gcpi: {
        positive: number;
        negative: number;
    };

    // Load Cases Pressures (Zones)
    loadCase1: ZonePressures;
    loadCase2: ZonePressures;
    loadCase3: ZonePressures; // Torsion
    loadCase4: ZonePressures; // Torsion

    // C&C
    ccRoofPressures: ZonePressures;
    ccWallPressures: ZonePressures;
}

export interface ZonePressures {
    [zone: string]: {
        max: number;
        min: number;
        positive: number;
        negative: number;
        gcpf: number; // For report
    };
}