// severity.test.mjs — Tests for scanners/lib/severity.mjs
// Zero external dependencies: node:test + node:assert only.

import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import {
  SEVERITY,
  riskScore,
  verdict,
  riskBand,
  gradeFromPassRate,
  OWASP_MAP,
  OWASP_AGENTIC_MAP,
  OWASP_SKILLS_MAP,
  OWASP_MCP_MAP,
  owaspCategorize,
} from '../../scanners/lib/severity.mjs';

// ---------------------------------------------------------------------------
// SEVERITY
// ---------------------------------------------------------------------------

describe('SEVERITY', () => {
  it('exports all five severity levels', () => {
    assert.ok('CRITICAL' in SEVERITY);
    assert.ok('HIGH' in SEVERITY);
    assert.ok('MEDIUM' in SEVERITY);
    assert.ok('LOW' in SEVERITY);
    assert.ok('INFO' in SEVERITY);
  });

  it('has lowercase string values', () => {
    assert.equal(SEVERITY.CRITICAL, 'critical');
    assert.equal(SEVERITY.HIGH, 'high');
    assert.equal(SEVERITY.MEDIUM, 'medium');
    assert.equal(SEVERITY.LOW, 'low');
    assert.equal(SEVERITY.INFO, 'info');
  });

  it('is frozen (immutable)', () => {
    assert.ok(Object.isFrozen(SEVERITY));
  });
});

// ---------------------------------------------------------------------------
// riskScore
// ---------------------------------------------------------------------------

describe('riskScore', () => {
  it('returns 0 when all counts are zero', () => {
    assert.equal(riskScore({ critical: 0, high: 0, medium: 0, low: 0, info: 0 }), 0);
  });

  it('returns 0 for empty counts object', () => {
    assert.equal(riskScore({}), 0);
  });

  it('returns 25 for one critical finding (weight=25)', () => {
    assert.equal(riskScore({ critical: 1 }), 25);
  });

  it('returns 100 (capped) for four critical findings (4*25=100)', () => {
    assert.equal(riskScore({ critical: 4 }), 100);
  });

  it('caps at 100 even if raw score would exceed it', () => {
    assert.equal(riskScore({ critical: 10, high: 10 }), 100);
  });

  it('returns 10 for one high finding (weight=10)', () => {
    assert.equal(riskScore({ high: 1 }), 10);
  });

  it('returns 4 for one medium finding (weight=4)', () => {
    assert.equal(riskScore({ medium: 1 }), 4);
  });

  it('returns 1 for one low finding (weight=1)', () => {
    assert.equal(riskScore({ low: 1 }), 1);
  });

  it('returns 0 for info-only findings (weight=0)', () => {
    assert.equal(riskScore({ info: 100 }), 0);
  });

  it('returns correct sum for mixed counts', () => {
    // 1*25 + 2*10 + 3*4 + 4*1 + 5*0 = 25+20+12+4+0 = 61
    assert.equal(riskScore({ critical: 1, high: 2, medium: 3, low: 4, info: 5 }), 61);
  });
});

// ---------------------------------------------------------------------------
// verdict
// ---------------------------------------------------------------------------

describe('verdict', () => {
  it('returns ALLOW for zero findings', () => {
    assert.equal(verdict({ critical: 0, high: 0, medium: 0, low: 0, info: 0 }), 'ALLOW');
  });

  it('returns ALLOW for empty counts', () => {
    assert.equal(verdict({}), 'ALLOW');
  });

  it('returns BLOCK when critical >= 1', () => {
    assert.equal(verdict({ critical: 1 }), 'BLOCK');
  });

  it('returns BLOCK when score >= 61 (even with no critical)', () => {
    // Need score >= 61 without critical: 7 high = 70 >= 61
    assert.equal(verdict({ high: 7 }), 'BLOCK');
  });

  it('returns BLOCK for score exactly 61', () => {
    // 1 critical + 2 high + 3 medium + 4 low = 25+20+12+4 = 61
    assert.equal(verdict({ critical: 1, high: 2, medium: 3, low: 4 }), 'BLOCK');
  });

  it('returns WARNING when high >= 1 (and no critical)', () => {
    assert.equal(verdict({ high: 1 }), 'WARNING');
  });

  it('returns WARNING when score >= 21 (even with no high or critical)', () => {
    // 6 medium = 24 >= 21; no critical or high
    assert.equal(verdict({ medium: 6 }), 'WARNING');
  });

  it('returns WARNING for score exactly 21 (no high or critical)', () => {
    // Smallest score >= 21 from low only would need 21 low, but medium is easier:
    // 5 medium + 1 low = 20+1 = 21
    assert.equal(verdict({ medium: 5, low: 1 }), 'WARNING');
  });

  it('returns ALLOW for score of 20 (low only, no high/critical)', () => {
    assert.equal(verdict({ low: 20 }), 'ALLOW');
  });
});

// ---------------------------------------------------------------------------
// riskBand
// ---------------------------------------------------------------------------

describe('riskBand', () => {
  it('returns Low for score 0', () => {
    assert.equal(riskBand(0), 'Low');
  });

  it('returns Low for score 20 (boundary)', () => {
    assert.equal(riskBand(20), 'Low');
  });

  it('returns Medium for score 21', () => {
    assert.equal(riskBand(21), 'Medium');
  });

  it('returns Medium for score 25', () => {
    assert.equal(riskBand(25), 'Medium');
  });

  it('returns Medium for score 40 (boundary)', () => {
    assert.equal(riskBand(40), 'Medium');
  });

  it('returns High for score 41', () => {
    assert.equal(riskBand(41), 'High');
  });

  it('returns High for score 50', () => {
    assert.equal(riskBand(50), 'High');
  });

  it('returns High for score 60 (boundary)', () => {
    assert.equal(riskBand(60), 'High');
  });

  it('returns Critical for score 61', () => {
    assert.equal(riskBand(61), 'Critical');
  });

  it('returns Critical for score 75', () => {
    assert.equal(riskBand(75), 'Critical');
  });

  it('returns Critical for score 80 (boundary)', () => {
    assert.equal(riskBand(80), 'Critical');
  });

  it('returns Extreme for score 81', () => {
    assert.equal(riskBand(81), 'Extreme');
  });

  it('returns Extreme for score 95', () => {
    assert.equal(riskBand(95), 'Extreme');
  });

  it('returns Extreme for score 100', () => {
    assert.equal(riskBand(100), 'Extreme');
  });
});

// ---------------------------------------------------------------------------
// gradeFromPassRate
// ---------------------------------------------------------------------------

describe('gradeFromPassRate', () => {
  it('returns A for perfect pass rate with no critical failures', () => {
    assert.equal(gradeFromPassRate(1.0, 0, 0), 'A');
  });

  it('returns A for passRate >= 0.89 with no critical category fails and no crits', () => {
    assert.equal(gradeFromPassRate(0.9, 0, 0), 'A');
  });

  it('does NOT return A if passRate >= 0.89 but has a critical category fail', () => {
    const grade = gradeFromPassRate(0.9, 1, 0);
    assert.notEqual(grade, 'A');
  });

  it('returns B for passRate >= 0.72 with no critical findings', () => {
    assert.equal(gradeFromPassRate(0.8, 0, 0), 'B');
  });

  it('returns B for passRate >= 0.72 even with critical category fails (if no critical findings)', () => {
    assert.equal(gradeFromPassRate(0.75, 2, 0), 'B');
  });

  it('returns C for passRate >= 0.56', () => {
    assert.equal(gradeFromPassRate(0.6, 0, 0), 'C');
  });

  it('returns C for passRate = 0.56 (lower boundary)', () => {
    assert.equal(gradeFromPassRate(0.56, 0, 0), 'C');
  });

  it('returns D for passRate >= 0.33 but < 0.56', () => {
    assert.equal(gradeFromPassRate(0.45, 0, 0), 'D');
  });

  it('returns D for passRate = 0.33 (lower boundary)', () => {
    assert.equal(gradeFromPassRate(0.33, 0, 0), 'D');
  });

  it('returns F for passRate < 0.33', () => {
    assert.equal(gradeFromPassRate(0.2, 0, 0), 'F');
  });

  it('returns F for passRate = 0', () => {
    assert.equal(gradeFromPassRate(0, 0, 0), 'F');
  });

  it('returns F when critCount >= 3 regardless of passRate', () => {
    assert.equal(gradeFromPassRate(1.0, 0, 3), 'F');
    assert.equal(gradeFromPassRate(0.9, 0, 5), 'F');
  });

  it('uses default values for optional parameters', () => {
    // gradeFromPassRate(passRate) with no optional args — should not throw
    const grade = gradeFromPassRate(0.95);
    assert.ok(['A', 'B', 'C', 'D', 'F'].includes(grade));
  });
});

// ---------------------------------------------------------------------------
// OWASP Framework Maps
// ---------------------------------------------------------------------------

describe('OWASP framework maps', () => {
  it('OWASP_MAP includes TFA scanner prefix', () => {
    assert.ok(OWASP_MAP.TFA, 'expected TFA key in OWASP_MAP');
    assert.ok(OWASP_MAP.TFA.includes('LLM01'));
    assert.ok(OWASP_MAP.TFA.includes('LLM02'));
    assert.ok(OWASP_MAP.TFA.includes('LLM06'));
  });

  it('OWASP_AGENTIC_MAP has all 8 scanner prefixes', () => {
    for (const prefix of ['UNI', 'ENT', 'PRM', 'DEP', 'TNT', 'GIT', 'NET', 'TFA']) {
      assert.ok(OWASP_AGENTIC_MAP[prefix], `expected ${prefix} in OWASP_AGENTIC_MAP`);
      assert.ok(OWASP_AGENTIC_MAP[prefix].length > 0);
      for (const cat of OWASP_AGENTIC_MAP[prefix]) {
        assert.ok(cat.startsWith('ASI'), `expected ASI prefix, got ${cat}`);
      }
    }
  });

  it('OWASP_SKILLS_MAP has all 8 scanner prefixes', () => {
    for (const prefix of ['UNI', 'ENT', 'PRM', 'DEP', 'TNT', 'GIT', 'NET', 'TFA']) {
      assert.ok(OWASP_SKILLS_MAP[prefix], `expected ${prefix} in OWASP_SKILLS_MAP`);
      for (const cat of OWASP_SKILLS_MAP[prefix]) {
        assert.ok(cat.startsWith('AST'), `expected AST prefix, got ${cat}`);
      }
    }
  });

  it('OWASP_MCP_MAP has all 8 scanner prefixes', () => {
    for (const prefix of ['UNI', 'ENT', 'PRM', 'DEP', 'TNT', 'GIT', 'NET', 'TFA']) {
      assert.ok(OWASP_MCP_MAP[prefix], `expected ${prefix} in OWASP_MCP_MAP`);
      for (const cat of OWASP_MCP_MAP[prefix]) {
        assert.ok(cat.startsWith('MCP'), `expected MCP prefix, got ${cat}`);
      }
    }
  });

  it('all framework maps are frozen', () => {
    assert.ok(Object.isFrozen(OWASP_MAP));
    assert.ok(Object.isFrozen(OWASP_AGENTIC_MAP));
    assert.ok(Object.isFrozen(OWASP_SKILLS_MAP));
    assert.ok(Object.isFrozen(OWASP_MCP_MAP));
  });
});

// ---------------------------------------------------------------------------
// owaspCategorize — multi-framework support
// ---------------------------------------------------------------------------

describe('owaspCategorize — multi-framework', () => {
  it('categorizes findings with LLM prefix', () => {
    const findings = [
      { owasp: 'LLM01', severity: 'critical' },
      { owasp: 'LLM01', severity: 'high' },
      { owasp: 'LLM06', severity: 'medium' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['LLM01'].count, 2);
    assert.equal(cats['LLM01'].critical, 1);
    assert.equal(cats['LLM01'].high, 1);
    assert.equal(cats['LLM06'].count, 1);
  });

  it('categorizes findings with ASI prefix', () => {
    const findings = [
      { owasp: 'ASI01', severity: 'critical' },
      { owasp: 'ASI02 ASI05', severity: 'high' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['ASI01'].count, 1);
    assert.equal(cats['ASI02'].count, 1);
    assert.equal(cats['ASI05'].count, 1);
  });

  it('categorizes findings with AST prefix', () => {
    const findings = [
      { owasp: 'AST03', severity: 'high' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['AST03'].count, 1);
    assert.equal(cats['AST03'].high, 1);
  });

  it('categorizes findings with MCP prefix', () => {
    const findings = [
      { owasp: 'MCP1 MCP6', severity: 'critical' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['MCP1'].count, 1);
    assert.equal(cats['MCP6'].count, 1);
  });

  it('categorizes mixed-framework findings in same owasp field', () => {
    const findings = [
      { owasp: 'LLM01 ASI01 AST01', severity: 'critical' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['LLM01'].count, 1);
    assert.equal(cats['ASI01'].count, 1);
    assert.equal(cats['AST01'].count, 1);
  });

  it('falls back to TFA in OWASP_MAP for scanner prefix', () => {
    const findings = [
      { scanner: 'TFA', severity: 'high' },
    ];
    const cats = owaspCategorize(findings);
    assert.ok(cats['LLM01'], 'expected LLM01 from TFA fallback');
    assert.ok(cats['LLM02'], 'expected LLM02 from TFA fallback');
    assert.ok(cats['LLM06'], 'expected LLM06 from TFA fallback');
  });

  it('returns Unmapped for findings with no owasp and unknown scanner', () => {
    const findings = [
      { severity: 'low' },
    ];
    const cats = owaspCategorize(findings);
    assert.equal(cats['Unmapped'].count, 1);
  });
});
