/**
 * Crafting System Tests — Phase 4.4
 *
 * Tests: crafting from inventory, reagent consumption,
 * product addition, failure reasons, condition checks.
 */

import { describe, it, expect } from 'vitest';
import { Inventory } from '../src/player/inventory';
import { craftFromInventory, type CraftInput } from '../src/player/crafting';

describe('craftFromInventory — success', () => {
  it('crafts NaCl from Na + Cl', () => {
    const inv = new Inventory();
    inv.addItem('Na', 3);
    inv.addItem('Cl', 2);

    const inputs: CraftInput[] = [
      { id: 'Na', count: 1 },
      { id: 'Cl', count: 1 },
    ];
    const result = craftFromInventory(inv, inputs);

    expect(result.success).toBe(true);
    expect(result.products).toContainEqual({ id: 'NaCl', count: 1 });
    // Reagents consumed
    expect(inv.getCount('Na')).toBe(2);
    expect(inv.getCount('Cl')).toBe(1);
    // Product added
    expect(inv.getCount('NaCl')).toBe(1);
  });

  it('returns reaction data on success', () => {
    const inv = new Inventory();
    inv.addItem('Na', 1);
    inv.addItem('Cl', 1);

    const result = craftFromInventory(inv, [
      { id: 'Na', count: 1 },
      { id: 'Cl', count: 1 },
    ]);

    expect(result.success).toBe(true);
    expect(result.reaction).toBeDefined();
    expect(result.reaction!.id).toBe('synth_nacl');
  });

  it('reports consumed reactants', () => {
    const inv = new Inventory();
    inv.addItem('Na', 5);
    inv.addItem('Cl', 5);

    const inputs: CraftInput[] = [
      { id: 'Na', count: 1 },
      { id: 'Cl', count: 1 },
    ];
    const result = craftFromInventory(inv, inputs);

    expect(result.consumedReactants).toEqual(inputs);
  });
});

describe('craftFromInventory — insufficient materials', () => {
  it('fails when missing reagent', () => {
    const inv = new Inventory();
    inv.addItem('Na', 1);
    // No Cl in inventory

    const result = craftFromInventory(inv, [
      { id: 'Na', count: 1 },
      { id: 'Cl', count: 1 },
    ]);

    expect(result.success).toBe(false);
    expect(result.failureReason).toContain('Cl');
    // Na not consumed
    expect(inv.getCount('Na')).toBe(1);
  });

  it('fails when not enough of a reagent', () => {
    const inv = new Inventory();
    inv.addItem('Na', 1);
    inv.addItem('Cl', 1);

    const result = craftFromInventory(inv, [
      { id: 'Na', count: 5 }, // need 5, have 1
      { id: 'Cl', count: 1 },
    ]);

    expect(result.success).toBe(false);
    expect(result.failureReason).toContain('Na');
  });
});

describe('craftFromInventory — unknown reaction', () => {
  it('fails with educational reason for no known reaction', () => {
    const inv = new Inventory(5000); // large capacity for heavy elements
    inv.addItem('Fe', 5);
    inv.addItem('Au', 5);

    const result = craftFromInventory(inv, [
      { id: 'Fe', count: 1 },
      { id: 'Au', count: 1 },
    ]);

    expect(result.success).toBe(false);
    expect(result.failureReason).toBeDefined();
    expect(result.failureReason!.length).toBeGreaterThan(10); // educational reason
    // Reagents not consumed
    expect(inv.getCount('Fe')).toBe(5);
    expect(inv.getCount('Au')).toBe(5);
  });

  it('explains noble gas inertness', () => {
    const inv = new Inventory();
    inv.addItem('He', 5);
    inv.addItem('O', 5);

    const result = craftFromInventory(inv, [
      { id: 'He', count: 1 },
      { id: 'O', count: 1 },
    ]);

    expect(result.success).toBe(false);
    expect(result.failureReason).toContain('noble gas');
  });
});

describe('craftFromInventory — conditions', () => {
  it('fails when temperature requirement not met', () => {
    const inv = new Inventory();
    inv.addItem('Fe', 5);
    inv.addItem('S', 5);

    // Fe + S → FeS requires minTemp: 500
    const result = craftFromInventory(inv, [
      { id: 'Fe', count: 1 },
      { id: 'S', count: 1 },
    ]);

    expect(result.success).toBe(false);
    expect(result.failureReason).toContain('temperature');
    // Reagents not consumed
    expect(inv.getCount('Fe')).toBe(5);
  });

  it('succeeds when conditions are met', () => {
    const inv = new Inventory();
    inv.addItem('Fe', 5);
    inv.addItem('S', 5);

    const result = craftFromInventory(inv, [
      { id: 'Fe', count: 1 },
      { id: 'S', count: 1 },
    ], { minTemp: 500 });

    expect(result.success).toBe(true);
    expect(result.products).toContainEqual({ id: 'FeS', count: 1 });
    expect(inv.getCount('Fe')).toBe(4);
    expect(inv.getCount('S')).toBe(4);
  });
});

describe('craftFromInventory — edge cases', () => {
  it('handles empty reactants list', () => {
    const inv = new Inventory();
    inv.addItem('Na', 5);

    const result = craftFromInventory(inv, []);

    expect(result.success).toBe(false);
  });

  it('handles inventory full for products', () => {
    const inv = new Inventory(100, 2); // Only 2 slots
    inv.addItem('Na', 1);
    inv.addItem('Cl', 1);

    // After crafting: Na consumed (slot freed), Cl consumed (slot freed), NaCl added
    // This should work since slots are freed before products are added
    const result = craftFromInventory(inv, [
      { id: 'Na', count: 1 },
      { id: 'Cl', count: 1 },
    ]);

    expect(result.success).toBe(true);
    expect(inv.getCount('NaCl')).toBe(1);
  });
});