using SQLLinter.Common;
using SQLLinter.Core.Interfaces;
using SQLLinter.Infrastructure.Rules.RuleExceptions;

namespace SQLLinter.Infrastructure.Parser;

public class SqlFileProcessor : ISqlFileProcessor
{
    private readonly IRuleVisitor ruleVisitor;

    private readonly IRuleExceptionFinder ruleExceptionFinder;

    public SqlFileProcessor(
        IRuleVisitor ruleVisitor,
        IPluginHandler pluginHandler
    )
    {
        this.ruleVisitor = ruleVisitor;
        ruleExceptionFinder = new RuleExceptionFinder(pluginHandler.RuleWithNames);
    }

    private int _fileCount;
    public int FileCount
    {
        get
        {
            return _fileCount;
        }
    }

    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 bool IsWholeFileIgnored(string filePath, IEnumerable<IExtendedRuleException> ignoredRules)
    {
        var ignoredRulesEnum = ignoredRules.ToArray();
        if (!ignoredRulesEnum.Any())
        {
            return false;
        }

        var lineOneRuleIgnores = ignoredRulesEnum.OfType<GlobalRuleException>().Where(x => 1 == x.StartLine).ToArray();
        if (!lineOneRuleIgnores.Any())
        {
            return false;
        }

        var lineCount = 0;
        using (var reader = new StreamReader(GetFileContents(filePath)))
        {
            while (reader.ReadLine() != null)
            {
                lineCount++;
            }
        }

        return lineOneRuleIgnores.Any(x => x.EndLine == lineCount);
    }

    private void HandleProcessing(string filePath, Stream fileStream)
    {
        var ignoredRules = ruleExceptionFinder.GetIgnoredRuleList(fileStream).ToList();
        if (IsWholeFileIgnored(filePath, ignoredRules))
        {
            return;
        }
        ProcessRules(fileStream, ignoredRules, filePath);
    }

    private void ProcessRules(Stream fileStream, IEnumerable<IRuleException> ignoredRules, string filePath)
    {
        ruleVisitor.VisitRules(filePath, ignoredRules, fileStream);
    }

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