/**
 * Calculation Utilities Tests
 * Verifies that frontend calculation logic matches backend formulas exactly.
 */

import { ManualCalculator, mockSaleOrderResponse } from './test-data-mocking';

// Test configuration
const TOLERANCE = 0.5; // Allow 0.5% tolerance for floating point differences

interface TestResult {
    name: string;
    passed: boolean;
    expected: number;
    actual: number;
    difference: number;
    error?: string;
}

interface TestSuite {
    category: string;
    results: TestResult[];
    passed: number;
    failed: number;
}

const testResults: TestSuite[] = [];

function runTest(category: string, name: string, expected: number, actual: number): TestResult {
    const difference = Math.abs(expected - actual);
    const passed = difference <= TOLERANCE;
    
    const result: TestResult = {
        name,
        passed,
        expected,
        actual,
        difference
    };
    
    // Find or create category suite
    let suite = testResults.find(s => s.category === category);
    if (!suite) {
        suite = { category, results: [], passed: 0, failed: 0 };
        testResults.push(suite);
    }
    
    suite.results.push(result);
    if (passed) {
        suite.passed++;
    } else {
        suite.failed++;
    }
    
    return result;
}

// ============================================
// TEST SUITE 1: Percentage Calculations
// ============================================
function testPercentageCalculations() {
    const m = mockSaleOrderResponse.metrics;
    const orderQty = m["Order Qty"];
    const reserved = m["Reserved Qty"];
    const issued = m["Actual Issued"];
    const packing = m["Total Packing"];
    const packFresh = m["Pack Fresh"];
    
    // Extra Gr Reserved %
    runTest(
        "Percentage Calculations",
        "Extra Gr Reserved %",
        m["Extra Gr Reserved %"],
        ManualCalculator.extra_gr_reserved_pct(reserved, orderQty)
    );
    
    // Actual Gr Issue %
    runTest(
        "Percentage Calculations",
        "Actual Gr Issue %",
        m["Actual Gr Issue %"],
        ManualCalculator.actual_gr_issue_pct(issued, orderQty)
    );
    
    // Shrinkage %
    runTest(
        "Percentage Calculations",
        "Shrinkage %",
        m["Shrinkage %"],
        ManualCalculator.shrinkage_pct(issued, packing)
    );
    
    // Fresh Pkg %
    runTest(
        "Percentage Calculations",
        "Fresh Pkg %",
        m["Fresh Pkg %"],
        ManualCalculator.fresh_pkg_pct(packFresh, packing)
    );
    
    // Fresh Yield %
    runTest(
        "Percentage Calculations",
        "Fresh Yield %",
        m["Fresh Yield %"],
        ManualCalculator.fresh_yield_pct(packFresh, issued)
    );
}

// ============================================
// TEST SUITE 2: Shortfall & Status
// ============================================
function testShortfallCalculations() {
    const m = mockSaleOrderResponse.metrics;
    const orderQty = m["Order Qty"];
    const packFresh = m["Pack Fresh"];
    
    // Shortfall
    runTest(
        "Shortfall & Status",
        "Shortfall",
        m["Shortfall"],
        ManualCalculator.shortfall(orderQty, packFresh)
    );
    
    // Status determination
    const expectedStatus = m["Status"];
    const calculatedShortfall = ManualCalculator.shortfall(orderQty, packFresh);
    const actualStatus = calculatedShortfall > 0 ? "Shortfall" : "Fulfilled";
    
    runTest(
        "Shortfall & Status",
        "Status",
        expectedStatus === actualStatus ? 1 : 0,
        1
    );
}

// ============================================
// TEST SUITE 3: Waterfall Calculations
// ============================================
function testWaterfallCalculations() {
    const waterfall = mockSaleOrderResponse.intelligence.waterfall;
    
    // Verify waterfall values
    const demand = waterfall.find((w: any) => w.label === "Demand")?.value || 0;
    const policyGap = waterfall.find((w: any) => w.label === "Policy Gap")?.value || 0;
    const executionAdj = waterfall.find((w: any) => w.label === "Execution Adj")?.value || 0;
    const processLoss = waterfall.find((w: any) => w.label === "Process Loss")?.value || 0;
    const delivered = waterfall.find((w: any) => w.label === "Delivered")?.value || 0;
    
    // Waterfall should add up: Demand + Policy + Execution + Process ≈ Delivered
    const calculatedDelivered = demand + policyGap + executionAdj + processLoss;
    
    runTest(
        "Waterfall",
        "Waterfall Sum",
        delivered,
        calculatedDelivered
    );
    
    // Verify individual components against metrics
    const m = mockSaleOrderResponse.metrics;
    
    runTest(
        "Waterfall",
        "Demand = Order Qty",
        m["Order Qty"],
        demand
    );
    
    runTest(
        "Waterfall",
        "Delivered = Pack Fresh",
        m["Pack Fresh"],
        delivered
    );
}

// ============================================
// TEST SUITE 4: Blame Attribution
// ============================================
function testBlameAttribution() {
    const blame = mockSaleOrderResponse.intelligence.blame_breakdown;
    
    // Blame percentages should sum to 100%
    const totalPct = blame.policy_pct + blame.execution_pct + blame.process_pct;
    
    runTest(
        "Blame Attribution",
        "Total % = 100",
        100,
        totalPct
    );
    
    // Verify individual impacts match waterfall
    const waterfall = mockSaleOrderResponse.intelligence.waterfall;
    const policyGap = Math.abs(waterfall.find((w: any) => w.label === "Policy Gap")?.value || 0);
    const executionAdj = Math.abs(waterfall.find((w: any) => w.label === "Execution Adj")?.value || 0);
    const processLoss = Math.abs(waterfall.find((w: any) => w.label === "Process Loss")?.value || 0);
    
    const totalImpact = policyGap + executionAdj + processLoss;
    
    // Verify policy percentage calculation
    const expectedPolicyPct = (policyGap / totalImpact) * 100;
    runTest(
        "Blame Attribution",
        "Policy %",
        blame.policy_pct,
        expectedPolicyPct
    );
    
    // Verify execution percentage calculation
    const expectedExecutionPct = (executionAdj / totalImpact) * 100;
    runTest(
        "Blame Attribution",
        "Execution %",
        blame.execution_pct,
        expectedExecutionPct
    );
    
    // Verify process percentage calculation
    const expectedProcessPct = (processLoss / totalImpact) * 100;
    runTest(
        "Blame Attribution",
        "Process %",
        blame.process_pct,
        expectedProcessPct
    );
}

// ============================================
// TEST SUITE 5: Risk Fingerprint
// ============================================
function testRiskFingerprint() {
    const risk = mockSaleOrderResponse.intelligence.risk_fingerprint;
    const normAdequacy = mockSaleOrderResponse.intelligence.norm_adequacy;
    
    // Norm reliability should be norm_adequacy / 100
    const expectedReliability = normAdequacy / 100;
    
    runTest(
        "Risk Fingerprint",
        "Norm Reliability",
        risk.norm_reliability,
        expectedReliability
    );
    
    // Risk level determination
    let expectedRiskLevel = "HIGH";
    if (risk.norm_reliability >= 0.98) {
        expectedRiskLevel = "LOW";
    } else if (risk.norm_reliability >= 0.95) {
        expectedRiskLevel = "MEDIUM";
    }
    
    runTest(
        "Risk Fingerprint",
        "Risk Level",
        risk.risk_level === expectedRiskLevel ? 1 : 0,
        1
    );
}

// ============================================
// TEST SUITE 6: Yield & Norm Score
// ============================================
function testYieldAndNormScore() {
    const m = mockSaleOrderResponse.metrics;
    const intel = mockSaleOrderResponse.intelligence;
    
    // Yield rate = Pack Fresh / Issued * 100
    runTest(
        "Yield & Norm Score",
        "Yield Rate",
        intel.yield_rate,
        ManualCalculator.yield_rate(m["Pack Fresh"], m["Actual Issued"])
    );
    
    // Norm adequacy = Pack Fresh / Order Qty * 100
    runTest(
        "Yield & Norm Score",
        "Norm Adequacy",
        intel.norm_adequacy,
        ManualCalculator.norm_score(m["Pack Fresh"], m["Order Qty"])
    );
}

// ============================================
// TEST SUITE 7: Edge Cases
// ============================================
function testEdgeCases() {
    // Zero division handling
    runTest(
        "Edge Cases",
        "Zero PO Qty - Extra Gr %",
        0,
        ManualCalculator.extra_gr_reserved_pct(100, 0)
    );
    
    runTest(
        "Edge Cases",
        "Zero Issued - Yield",
        0,
        ManualCalculator.yield_rate(100, 0)
    );
    
    runTest(
        "Edge Cases",
        "Zero Order Qty - Norm Score",
        0,
        ManualCalculator.norm_score(100, 0)
    );
    
    // Negative values (under-issuance)
    runTest(
        "Edge Cases",
        "Negative Deviation",
        -10,
        ManualCalculator.extra_gr_reserved_pct(90, 100)
    );
}

// ============================================
// RUN ALL TESTS
// ============================================
export function runAllCalculationTests(): {
    suites: TestSuite[];
    summary: {
        total: number;
        passed: number;
        failed: number;
        passRate: number;
    };
} {
    // Clear previous results
    testResults.length = 0;
    
    // Run all test suites
    testPercentageCalculations();
    testShortfallCalculations();
    testWaterfallCalculations();
    testBlameAttribution();
    testRiskFingerprint();
    testYieldAndNormScore();
    testEdgeCases();
    
    // Calculate summary
    const total = testResults.reduce((sum, s) => sum + s.passed + s.failed, 0);
    const passed = testResults.reduce((sum, s) => sum + s.passed, 0);
    const failed = testResults.reduce((sum, s) => sum + s.failed, 0);
    
    return {
        suites: testResults,
        summary: {
            total,
            passed,
            failed,
            passRate: total > 0 ? (passed / total) * 100 : 0
        }
    };
}

// Export for running
export { testResults };