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/**
 * Unit tests for OpsetChecker.compute()
 * Validates: Requirements 22.1, 22.2, 22.3, 22.4, 22.5
 */

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

const STANDARD_OPSETS = [7, 9, 11, 13, 15, 17, 18, 19, 20, 21];

/**
 * Mirror the pure compute logic from OpsetChecker for testability.
 */
function computeOpsetData(parsedModel) {
  const modelOpset = (parsedModel && parsedModel.metadata && parsedModel.metadata.opsetVersion) || 0;

  const compatibility = STANDARD_OPSETS.map((version) => ({
    version,
    compatible: version >= modelOpset,
  }));

  const opsetImport = (parsedModel && parsedModel.metadata && Array.isArray(parsedModel.metadata.opsetImport))
    ? parsedModel.metadata.opsetImport
    : [];
  const domains = opsetImport.map((op) => ({
    domain: op.domain || 'ai.onnx (default)',
    version: op.version || 0,
  }));

  const nodes = (parsedModel && parsedModel.graph && parsedModel.graph.nodes) || [];
  const customOperators = [];
  const seen = new Set();
  for (const node of nodes) {
    if (node.domain && node.domain !== '' && node.domain !== 'ai.onnx') {
      const key = `${node.domain}::${node.opType}`;
      if (!seen.has(key)) {
        seen.add(key);
        customOperators.push({ name: node.opType || 'Unknown', domain: node.domain });
      }
    }
  }

  const allStandard = customOperators.length === 0;

  return { modelOpset, compatibility, domains, customOperators, allStandard };
}

describe('OpsetChecker.compute', () => {
  it('should return the model opset version (Req 22.1)', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);
    expect(result.modelOpset).toBe(13);
  });

  it('should mark standard versions >= model opset as compatible (Req 22.2)', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);

    for (const entry of result.compatibility) {
      if (entry.version >= 13) {
        expect(entry.compatible).toBe(true);
      } else {
        expect(entry.compatible).toBe(false);
      }
    }
  });

  it('should mark all versions compatible when model opset is very low', () => {
    const model = {
      metadata: { opsetVersion: 1 },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);
    expect(result.compatibility.every((e) => e.compatible)).toBe(true);
  });

  it('should mark most versions incompatible when model opset is very high', () => {
    const model = {
      metadata: { opsetVersion: 21 },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);
    const compatibleVersions = result.compatibility.filter((e) => e.compatible);
    expect(compatibleVersions.length).toBe(1);
    expect(compatibleVersions[0].version).toBe(21);
  });

  it('should display all domains from opset_import (Req 22.3)', () => {
    const model = {
      metadata: {
        opsetVersion: 13,
        opsetImport: [
          { domain: '', version: 13 },
          { domain: 'ai.onnx.ml', version: 2 },
        ],
      },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);
    expect(result.domains).toHaveLength(2);
    expect(result.domains[0].domain).toBe('ai.onnx (default)');
    expect(result.domains[0].version).toBe(13);
    expect(result.domains[1].domain).toBe('ai.onnx.ml');
    expect(result.domains[1].version).toBe(2);
  });

  it('should list custom domain operators (Req 22.4)', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: {
        nodes: [
          { opType: 'Conv', domain: '' },
          { opType: 'Relu', domain: '' },
          { opType: 'CustomOp', domain: 'com.mycompany' },
          { opType: 'AnotherOp', domain: 'com.mycompany' },
        ],
      },
    };
    const result = computeOpsetData(model);
    expect(result.allStandard).toBe(false);
    expect(result.customOperators).toHaveLength(2);
    expect(result.customOperators[0]).toEqual({ name: 'CustomOp', domain: 'com.mycompany' });
    expect(result.customOperators[1]).toEqual({ name: 'AnotherOp', domain: 'com.mycompany' });
  });

  it('should deduplicate custom operators with same domain and opType', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: {
        nodes: [
          { opType: 'CustomOp', domain: 'com.mycompany' },
          { opType: 'CustomOp', domain: 'com.mycompany' },
          { opType: 'CustomOp', domain: 'com.mycompany' },
        ],
      },
    };
    const result = computeOpsetData(model);
    expect(result.customOperators).toHaveLength(1);
  });

  it('should report allStandard=true when all operators are from default domain (Req 22.5)', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: {
        nodes: [
          { opType: 'Conv', domain: '' },
          { opType: 'Relu', domain: '' },
          { opType: 'Add', domain: '' },
        ],
      },
    };
    const result = computeOpsetData(model);
    expect(result.allStandard).toBe(true);
    expect(result.customOperators).toHaveLength(0);
  });

  it('should handle null/undefined model gracefully', () => {
    const result = computeOpsetData(null);
    expect(result.modelOpset).toBe(0);
    expect(result.compatibility.length).toBe(STANDARD_OPSETS.length);
    expect(result.domains).toHaveLength(0);
    expect(result.customOperators).toHaveLength(0);
    expect(result.allStandard).toBe(true);
  });

  it('should handle model with no opsetImport', () => {
    const model = {
      metadata: { opsetVersion: 11 },
      graph: { nodes: [] },
    };
    const result = computeOpsetData(model);
    expect(result.domains).toHaveLength(0);
  });

  it('should treat ai.onnx domain nodes as standard', () => {
    const model = {
      metadata: { opsetVersion: 13 },
      graph: {
        nodes: [
          { opType: 'Conv', domain: 'ai.onnx' },
          { opType: 'Relu', domain: '' },
        ],
      },
    };
    const result = computeOpsetData(model);
    expect(result.allStandard).toBe(true);
  });
});