using SQLLinter.Core.Interfaces;
using SQLLinter.Infrastructure.Interfaces;
using SQLLinter.Infrastructure.Parser;

namespace SQLLinter.Infrastructure.Diagram;

public class SqlDiagramProcessor : ISqlDiagramProcessor
{
    private readonly BpmnDiagram _bpmnDiagram;
    private readonly IFragmentBuilder _fragmentBuilder;
    private readonly ISqlStreamReaderBuilder _sqlStreamReaderBuilder;

    public SqlDiagramProcessor(IFragmentBuilder fragmentBuilder, BpmnDiagram bpmnDiagram)
        : this(fragmentBuilder, bpmnDiagram, new SqlStreamReaderBuilder()) { }

    public SqlDiagramProcessor(IFragmentBuilder fragmentBuilder, BpmnDiagram bpmnDiagram, ISqlStreamReaderBuilder sqlStreamReaderBuilder)
    {
        _fragmentBuilder = fragmentBuilder;
        _bpmnDiagram = bpmnDiagram;
        _sqlStreamReaderBuilder = sqlStreamReaderBuilder;

    }

    public void ProcessList(List<string> filePaths)
    {
        foreach (var path in filePaths)
        {
            ProcessFile(path);
        }
    }

    public void ProcessPath(string path)
    {
        ProcessFile(path);
    }

    private void ProcessFile(string filePath)
    {
        var fileStream = GetFileContents(filePath);
        HandleProcessing(filePath, fileStream);
    }

    public void ProcessList(Dictionary<string, Stream> files)
    {
        foreach (var file in files)
        {
            HandleProcessing(file.Key, file.Value);
        }
    }

    private void HandleProcessing(string filePath, Stream fileStream)
    {
        var fragment = _fragmentBuilder.GetFragment(filePath, GetSqlTextReader(fileStream), out var errors);

        if (fragment == null || errors.Count > 0)
        {
            return;
        }

        var diagramm = BpmnBuilder.Build(fragment);
        _bpmnDiagram.Subprocesses.Add(diagramm.Main);
    }

    private Stream GetFileContents(string filePath)
    {
        return File.OpenRead(filePath);
    }

    private StreamReader GetSqlTextReader(Stream sqlFileStream)
    {
        return _sqlStreamReaderBuilder.CreateReader(sqlFileStream);
    }
}