import { describe, it, expect } from 'vitest';

describe('Game Logic - Inventory Management', () => {
  describe('Barrel Calculations', () => {
    it('should calculate correct fuel barrel count', () => {
      const fuel = 100;
      const barrelCount = Math.ceil(fuel / 10);
      expect(barrelCount).toBe(10);
    });

    it('should calculate correct oil barrel count', () => {
      const whaleOil = 25;
      const barrelCount = Math.ceil(whaleOil / 10);
      expect(barrelCount).toBe(3);
    });

    it('should handle zero barrels', () => {
      expect(Math.ceil(0 / 10)).toBe(0);
    });

    it('should handle partial barrels', () => {
      expect(Math.ceil(15 / 10)).toBe(2);
      expect(Math.ceil(1 / 10)).toBe(1);
    });
  });

  describe('Inventory Limits', () => {
    it('should enforce fuel max capacity of 100', () => {
      const maxFuel = 100;
      let currentFuel = 100;

      // Try to add more fuel
      currentFuel = Math.min(currentFuel + 10, maxFuel);
      expect(currentFuel).toBe(100);
    });

    it('should enforce whale oil max capacity of 50', () => {
      const maxOil = 50;
      let currentOil = 50;

      // Try to add more oil
      currentOil = Math.min(currentOil + 5, maxOil);
      expect(currentOil).toBe(50);
    });

    it('should enforce penguin max capacity of 20', () => {
      const maxPenguins = 20;
      let currentPenguins = 20;

      // Try to add more penguins
      currentPenguins = Math.min(currentPenguins + 3, maxPenguins);
      expect(currentPenguins).toBe(20);
    });
  });
});

describe('Game Logic - Whale Hunting', () => {
  describe('Fuel Consumption', () => {
    it('should consume 2 fuel when processing a whale', () => {
      let fuel = 100;
      const fuelCost = 2;
      fuel -= fuelCost;
      expect(fuel).toBe(98);
    });

    it('should not process whale without enough fuel', () => {
      let fuel = 1;
      const requiredFuel = 2;
      const canProcess = fuel >= requiredFuel;
      expect(canProcess).toBe(false);
    });

    it('should process whale with exact fuel amount', () => {
      let fuel = 2;
      const requiredFuel = 2;
      const canProcess = fuel >= requiredFuel;
      expect(canProcess).toBe(true);
    });
  });

  describe('Whale Oil Rewards', () => {
    it('should gain 1 oil per whale killed', () => {
      let whaleOil = 0;
      whaleOil += 1;
      expect(whaleOil).toBe(1);
    });

    it('should accumulate oil from multiple whales', () => {
      let whaleOil = 5;
      whaleOil += 1;
      whaleOil += 1;
      whaleOil += 1;
      expect(whaleOil).toBe(8);
    });
  });

  describe('Whale Health System', () => {
    it('should require 3 hits to kill a whale', () => {
      let health = 3;
      health -= 1; // Hit 1
      expect(health).toBe(2);
      health -= 1; // Hit 2
      expect(health).toBe(1);
      health -= 1; // Hit 3
      expect(health).toBe(0);
      expect(health <= 0).toBe(true);
    });

    it('should check if whale is alive', () => {
      let health = 2;
      expect(health > 0).toBe(true);

      health = 0;
      expect(health > 0).toBe(false);
    });
  });

  describe('Crosshair Bounds', () => {
    it('should clamp crosshair X within 0-800', () => {
      const clamp = (value, min, max) => Math.max(min, Math.min(max, value));

      expect(clamp(-50, 0, 800)).toBe(0);
      expect(clamp(900, 0, 800)).toBe(800);
      expect(clamp(400, 0, 800)).toBe(400);
    });

    it('should clamp crosshair Y within 0-600', () => {
      const clamp = (value, min, max) => Math.max(min, Math.min(max, value));

      expect(clamp(-100, 0, 600)).toBe(0);
      expect(clamp(700, 0, 600)).toBe(600);
      expect(clamp(300, 0, 600)).toBe(300);
    });
  });
});

describe('Game Logic - Mobile Detection', () => {
  it('should detect iPhone user agent', () => {
    const mobileUA = 'Mozilla/5.0 (iPhone; CPU iPhone OS 14_0 like Mac OS X)';
    const isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(mobileUA);
    expect(isMobile).toBe(true);
  });

  it('should detect Android user agent', () => {
    const mobileUA = 'Mozilla/5.0 (Linux; Android 10; SM-G973F)';
    const isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(mobileUA);
    expect(isMobile).toBe(true);
  });

  it('should not detect desktop as mobile', () => {
    const desktopUA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/91.0';
    const isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(desktopUA);
    expect(isMobile).toBe(false);
  });
});

describe('Game Logic - Scene Transitions', () => {
  it('should calculate fuel cost for destinations', () => {
    const destinations = {
      hunting: 0,
      antarctic: 0,
      port: 0
    };

    expect(destinations.hunting).toBe(0);
    expect(destinations.antarctic).toBe(0);
    expect(destinations.port).toBe(0);
  });

  it('should validate penguin discovery state', () => {
    let penguins = 0;
    let discovered = penguins > 0;
    expect(discovered).toBe(false);

    penguins = 5;
    discovered = penguins > 0;
    expect(discovered).toBe(true);
  });
});