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import * as stream from 'stream';

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

import {LLVMOptTransformer} from '../lib/llvm-opt-transformer.js';

describe('LLVM opt transformer', () => {
    it('should work', async () => {
        const doc = `--- !Analysis
Pass:            prologepilog
Name:            StackSize
DebugLoc:        { File: example.cpp, Line: 2, Column: 0 }
Function:        _Z6squarei
Args:
  - NumStackBytes:   '8'
  - String:          ' stack bytes in function'
...
--- !Analysis
Pass:            asm-printer
Name:            InstructionCount
DebugLoc:        { File: example.cpp, Line: 2, Column: 0 }
Function:        _Z6squarei
Args:
  - NumInstructions: '7'
  - String:          ' instructions in function'
...
`;
        const readString = new stream.PassThrough();
        readString.push(doc);
        readString.end();
        const optStream = readString.pipe(new LLVMOptTransformer());

        const output: object[] = [];
        for await (const opt of optStream) {
            output.push(opt);
        }
        expect(output).toEqual([
            {
                Args: [
                    {
                        NumStackBytes: '8',
                    },
                    {
                        String: ' stack bytes in function',
                    },
                ],
                DebugLoc: {
                    Column: 0,
                    File: 'example.cpp',
                    Line: 2,
                },
                Function: '_Z6squarei',
                Name: 'StackSize',
                Pass: 'prologepilog',
                displayString: '8 stack bytes in function',
                optType: 'Analysis',
            },
            {
                Args: [
                    {
                        NumInstructions: '7',
                    },
                    {
                        String: ' instructions in function',
                    },
                ],
                DebugLoc: {
                    Column: 0,
                    File: 'example.cpp',
                    Line: 2,
                },
                Function: '_Z6squarei',
                Name: 'InstructionCount',
                Pass: 'asm-printer',
                displayString: '7 instructions in function',
                optType: 'Analysis',
            },
        ]);
    });
    it('should error with unparseable yaml data', async () => {
        const doc = `--- !Analysis
broken: not a yaml doc
broken: duplicate key makes this invalid
...
`;
        const readString = new stream.PassThrough();
        readString.push(doc);
        readString.end();
        await expect(
            (async () => {
                const optStream = stream.pipeline(readString, new LLVMOptTransformer(), res => {
                    return res;
                });
                for await (const _ of optStream) {
                    // just consume
                }
            })(),
        ).rejects.toThrow(YAMLParseError);
    });
});