import * as plugins from './calculation.plugins.js';

export interface ICalculatorOptions {
  precision?: number;
  rounding?: plugins.Decimal.Rounding;
}

/**
 * Base calculator class providing high-precision decimal arithmetic
 * for financial calculations
 */
export class Calculator {
  private precision: number;
  private rounding: plugins.Decimal.Rounding;

  constructor(options: ICalculatorOptions = {}) {
    this.precision = options.precision || 10;
    this.rounding = options.rounding || plugins.Decimal.ROUND_HALF_UP;
    
    // Configure Decimal.js globally for this calculator instance
    plugins.Decimal.set({
      precision: this.precision,
      rounding: this.rounding
    });
  }

  /**
   * Create a Decimal instance from a value
   */
  public decimal(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value);
  }

  /**
   * Add two or more numbers with decimal precision
   */
  public add(...values: plugins.Decimal.Value[]): plugins.Decimal {
    return values.reduce<plugins.Decimal>((sum, value) => {
      return sum.add(this.decimal(value));
    }, new plugins.Decimal(0));
  }

  /**
   * Subtract numbers with decimal precision
   */
  public subtract(minuend: plugins.Decimal.Value, ...subtrahends: plugins.Decimal.Value[]): plugins.Decimal {
    let result = new plugins.Decimal(minuend);
    for (const subtrahend of subtrahends) {
      result = result.sub(subtrahend);
    }
    return result;
  }

  /**
   * Multiply numbers with decimal precision
   */
  public multiply(...values: plugins.Decimal.Value[]): plugins.Decimal {
    return values.reduce<plugins.Decimal>((product, value) => {
      return product.mul(this.decimal(value));
    }, new plugins.Decimal(1));
  }

  /**
   * Divide numbers with decimal precision
   */
  public divide(dividend: plugins.Decimal.Value, divisor: plugins.Decimal.Value): plugins.Decimal {
    const divisorDecimal = new plugins.Decimal(divisor);
    if (divisorDecimal.isZero()) {
      throw new Error('Division by zero');
    }
    return new plugins.Decimal(dividend).div(divisor);
  }

  /**
   * Calculate power with decimal precision
   */
  public power(base: plugins.Decimal.Value, exponent: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(base).pow(exponent);
  }

  /**
   * Calculate square root with decimal precision
   */
  public sqrt(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value).sqrt();
  }

  /**
   * Calculate natural logarithm with decimal precision
   */
  public ln(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value).ln();
  }

  /**
   * Calculate logarithm base 10 with decimal precision
   */
  public log10(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value).log();
  }

  /**
   * Calculate exponential (e^x) with decimal precision
   */
  public exp(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value).exp();
  }

  /**
   * Round a number to specified decimal places
   */
  public round(value: plugins.Decimal.Value, decimalPlaces: number = 0): plugins.Decimal {
    return new plugins.Decimal(value).toDecimalPlaces(decimalPlaces);
  }

  /**
   * Check if a value equals another value
   */
  public equals(value1: plugins.Decimal.Value, value2: plugins.Decimal.Value): boolean {
    return new plugins.Decimal(value1).equals(value2);
  }

  /**
   * Check if a value is greater than another value
   */
  public greaterThan(value1: plugins.Decimal.Value, value2: plugins.Decimal.Value): boolean {
    return new plugins.Decimal(value1).greaterThan(value2);
  }

  /**
   * Check if a value is less than another value
   */
  public lessThan(value1: plugins.Decimal.Value, value2: plugins.Decimal.Value): boolean {
    return new plugins.Decimal(value1).lessThan(value2);
  }

  /**
   * Get the minimum value from an array of values
   */
  public min(...values: plugins.Decimal.Value[]): plugins.Decimal {
    return plugins.Decimal.min(...values);
  }

  /**
   * Get the maximum value from an array of values
   */
  public max(...values: plugins.Decimal.Value[]): plugins.Decimal {
    return plugins.Decimal.max(...values);
  }

  /**
   * Calculate the absolute value
   */
  public abs(value: plugins.Decimal.Value): plugins.Decimal {
    return new plugins.Decimal(value).abs();
  }

  /**
   * Convert a decimal to a regular number
   */
  public toNumber(value: plugins.Decimal.Value): number {
    return new plugins.Decimal(value).toNumber();
  }

  /**
   * Convert a decimal to a string
   */
  public toString(value: plugins.Decimal.Value): string {
    return new plugins.Decimal(value).toString();
  }

  /**
   * Convert a decimal to a fixed-point string
   */
  public toFixed(value: plugins.Decimal.Value, decimalPlaces: number = 2): string {
    return new plugins.Decimal(value).toFixed(decimalPlaces);
  }
}