import { describe, it, expect, beforeEach } from 'vitest';
import type { RunState } from '../src/run/types';
import { RunPhase, ESCALATION_RATE } from '../src/run/types';
import { createRunState, advancePhase, updateEscalation } from '../src/run/state';
import {
  getEscalationEffects,
  type EscalationEffects,
} from '../src/run/escalation';
import {
  createCrisisState,
  applyCrisisDamage,
  attemptNeutralize,
  isCrisisResolved,
  getCrisisPlayerDamage,
  getCrisisTint,
  CHEMICAL_PLAGUE,
} from '../src/run/crisis';

// ─── Escalation Effects ──────────────────────────────────────────

describe('Escalation Effects', () => {
  it('at 0 escalation, all multipliers are 1.0', () => {
    const fx = getEscalationEffects(0);
    expect(fx.creatureSpeedMultiplier).toBe(1.0);
    expect(fx.creatureAggroRange).toBe(1.0);
    expect(fx.creatureAttackMultiplier).toBe(1.0);
    expect(fx.reactionInstability).toBe(0);
    expect(fx.environmentalDamage).toBe(0);
  });

  it('at 0.5 escalation, effects are moderate', () => {
    const fx = getEscalationEffects(0.5);
    expect(fx.creatureSpeedMultiplier).toBeGreaterThan(1.0);
    expect(fx.creatureSpeedMultiplier).toBeLessThan(2.0);
    expect(fx.creatureAggroRange).toBeGreaterThan(1.0);
    expect(fx.creatureAttackMultiplier).toBeGreaterThan(1.0);
    expect(fx.reactionInstability).toBeGreaterThan(0);
  });

  it('at 1.0 escalation, effects are maximal', () => {
    const fx = getEscalationEffects(1.0);
    expect(fx.creatureSpeedMultiplier).toBe(1.5);
    expect(fx.creatureAggroRange).toBe(1.8);
    expect(fx.creatureAttackMultiplier).toBe(1.6);
    expect(fx.reactionInstability).toBe(0.3);
    expect(fx.environmentalDamage).toBeGreaterThan(0);
  });

  it('escalation clamps values correctly', () => {
    const fx = getEscalationEffects(2.0); // over max
    expect(fx.creatureSpeedMultiplier).toBe(1.5);

    const fxNeg = getEscalationEffects(-1.0); // under min
    expect(fxNeg.creatureSpeedMultiplier).toBe(1.0);
  });
});

// ─── Crisis Damage ───────────────────────────────────────────────

describe('Crisis Player Damage', () => {
  it('no damage below 30% progress', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.2;
    expect(getCrisisPlayerDamage(crisis, 1000)).toBe(0);
  });

  it('damage increases with progress above 30%', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.5;
    const dmg = getCrisisPlayerDamage(crisis, 1000);
    expect(dmg).toBeGreaterThan(0);
  });

  it('damage scales with delta time', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.8;
    const dmg1 = getCrisisPlayerDamage(crisis, 1000);
    const dmg2 = getCrisisPlayerDamage(crisis, 2000);
    expect(dmg2).toBeCloseTo(dmg1 * 2, 1);
  });

  it('no damage when resolved', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.8;
    crisis.resolved = true;
    expect(getCrisisPlayerDamage(crisis, 1000)).toBe(0);
  });
});

describe('Crisis Visual Tint', () => {
  it('returns no tint at 0 progress', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0;
    const tint = getCrisisTint(crisis);
    expect(tint.alpha).toBe(0);
  });

  it('returns tint at high progress', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.8;
    const tint = getCrisisTint(crisis);
    expect(tint.alpha).toBeGreaterThan(0);
    expect(tint.color).toBeDefined();
  });

  it('returns no tint when resolved', () => {
    const crisis = createCrisisState(CHEMICAL_PLAGUE);
    crisis.progress = 0.8;
    crisis.resolved = true;
    const tint = getCrisisTint(crisis);
    expect(tint.alpha).toBe(0);
  });
});

// ─── Escalation-Phase Integration ────────────────────────────────

describe('Escalation Integration', () => {
  let state: RunState;

  beforeEach(() => {
    state = createRunState(1, 'alchemist');
    state.phase = RunPhase.Escalation;
  });

  it('escalation grows steadily over time', () => {
    // Simulate 30 seconds
    for (let i = 0; i < 30; i++) {
      updateEscalation(state, 1000);
    }
    expect(state.escalation).toBeCloseTo(ESCALATION_RATE * 30, 2);
  });

  it('effects scale linearly with escalation', () => {
    updateEscalation(state, 100_000); // ~100 seconds
    const fx = getEscalationEffects(state.escalation);
    expect(fx.creatureSpeedMultiplier).toBeGreaterThan(1.0);
    expect(fx.creatureAggroRange).toBeGreaterThan(1.0);
  });

  it('full escalation cycle reaches crisis threshold', () => {
    // Simulate until threshold
    for (let i = 0; i < 200; i++) {
      updateEscalation(state, 1000);
    }
    expect(state.escalation).toBeGreaterThanOrEqual(CHEMICAL_PLAGUE.triggerThreshold);
  });
});