using System.Diagnostics;
using System.Text;
using System.Text.Json;

namespace Pdftract.Codegen;

/// <summary>
/// This file is auto-generated. Do not edit manually.
/// </summary>

public class Pdftract : IDisposable
{
    private readonly string _binaryPath;
    private readonly string _version = "{{ version }}";

    public Pdftract() : this("pdftract")
    {
    }

    public Pdftract(string binaryPath)
    {
        _binaryPath = binaryPath;
    }

    private ProcessResult Execute(string[] args)
    {
        var psi = new ProcessStartInfo
        {
            FileName = _binaryPath,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false
        };

        foreach (var arg in args)
        {
            psi.ArgumentList.Add(arg);
        }

        using var process = Process.Start(psi);
        if (process == null)
        {
            throw new PdftractException("Failed to start process", -1);
        }

        var stdout = process.StandardOutput.ReadToEnd();
        var stderr = process.StandardError.ReadToEnd();
        process.WaitForExit();

        if (process.ExitCode != 0)
        {
            throw MapError(stderr, process.ExitCode);
        }

        return new ProcessResult(stdout, process.ExitCode);
    }

    private PdftractException MapError(string stderr, int exitCode)
    {
        return exitCode switch
        {
            {% for error in errors %}
            {% if error.exit_code != 0 %}
            {{ error.exit_code }} => new {{ error.exception_name }}(stderr, exitCode),
            {% endif %}
            {% endfor %}
            _ => new PdftractException(stderr, exitCode)
        };
    }

    {% for method in methods %}
    {% if method.name == 'extract_stream' %}
    public async IAsyncEnumerable<{{ method.return_type }}> {{ method.camel_name }}(Source source, {{ method.options_type }}? options)
    {
        var args = new List<string> { "{{ method.cli_flag }}" };
        args.AddRange(source.ToArgs());

        if (options != null)
        {
            args.AddRange(options.ToArgs());
        }

        var psi = new ProcessStartInfo
        {
            FileName = _binaryPath,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false
        };

        foreach (var arg in args)
        {
            psi.ArgumentList.Add(arg);
        }

        using var process = Process.Start(psi);
        if (process == null)
        {
            throw new PdftractException("Failed to start process", -1);
        }

        using var reader = process.StandardOutput;

        while (!reader.EndOfStream)
        {
            var line = await reader.ReadLineAsync();
            if (string.IsNullOrWhiteSpace(line)) continue;

            var result = JsonSerializer.Deserialize<{{ method.return_type }}>(line);
            if (result != null)
            {
                yield return result;
            }
        }

        await process.WaitForExitAsync();

        if (process.ExitCode != 0)
        {
            var stderr = await process.StandardError.ReadToEndAsync();
            throw MapError(stderr, process.ExitCode);
        }
    }
    {% elif method.name == 'search' %}
    public async IAsyncEnumerable<{{ method.return_type }}> {{ method.camel_name }}(Source source, string pattern, {{ method.options_type }}? options)
    {
        var args = new List<string> { "grep", pattern };
        args.AddRange(source.ToArgs());

        if (options != null)
        {
            args.AddRange(options.ToArgs());
        }

        var psi = new ProcessStartInfo
        {
            FileName = _binaryPath,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false
        };

        foreach (var arg in args)
        {
            psi.ArgumentList.Add(arg);
        }

        using var process = Process.Start(psi);
        if (process == null)
        {
            throw new PdftractException("Failed to start process", -1);
        }

        using var reader = process.StandardOutput;

        while (!reader.EndOfStream)
        {
            var line = await reader.ReadLineAsync();
            if (string.IsNullOrWhiteSpace(line)) continue;

            var result = JsonSerializer.Deserialize<{{ method.return_type }}>(line);
            if (result != null)
            {
                yield return result;
            }
        }

        await process.WaitForExitAsync();

        if (process.ExitCode != 0)
        {
            var stderr = await process.StandardError.ReadToEndAsync();
            throw MapError(stderr, process.ExitCode);
        }
    }
    {% elif method.name == 'verify_receipt' %}
    public bool {{ method.camel_name }}(string path, string receipt)
    {
        var result = Execute(new[] { "{{ method.cli_flag }}", path, receipt });
        return bool.Parse(result.Stdout.Trim());
    }
    {% else %}
    public {{ method.return_type }} {{ method.camel_name }}(Source source{% if method.has_options %}, {{ method.options_type }}? options{% endif %})
    {
        var args = new List<string> { "{{ method.cli_flag }}" };
        args.AddRange(source.ToArgs());

        {% if method.has_options %}
        if (options != null)
        {
            args.AddRange(options.ToArgs());
        }
        {% endif %}

        {% if method.name == 'extract_text' %}
        args.Add("--text");
        {% elif method.name == 'extract_markdown' %}
        args.Add("--md");
        {% elif method.name == 'get_metadata' %}
        args.Add("--metadata-only");
        {% endif %}

        var result = Execute(args.ToArray());

        {% if method.returns_string %}
        return result.Stdout;
        {% else %}
        return JsonSerializer.Deserialize<{{ method.return_type }}>(result.Stdout)
            ?? throw new PdftractException("Failed to deserialize result", -1);
        {% endif %}
    }
    {% endif %}
    {% endfor %}

    public void Dispose()
    {
        // No resources to clean up
    }

    private record ProcessResult(string Stdout, int ExitCode);
}