package api

import (
	"bufio"
	"context"
	"fmt"
	"io"
	"log/slog"
	"regexp"
	"time"

	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/client"
)

const vttContainerId string = "foundry-foundry-1"

// Strip ansi control characters from source
//
// The source reader is automatically closed when stripped reader is
func StripAnsi(source io.ReadCloser) io.ReadCloser {

	regex := regexp.MustCompile(`\x1b[[0-9;]*m`)
	reader, writer := io.Pipe()

	go func() {
		bufReader := bufio.NewReader(source)
		defer source.Close()
		defer writer.Close()

	cleanSource:
		for {
			line, err := bufReader.ReadBytes('\n')
			switch {
			case err == io.EOF:
				if len(line) > 0 {
					cleaned := regex.ReplaceAll(line, []byte(""))
					writer.Write(cleaned)
				}
				break cleanSource
			case err != nil:
				panic(err)
			default:
				cleaned := regex.ReplaceAll(line, []byte(""))
				writer.Write(cleaned)
			}
		}
	}()

	return reader
}

func stopVtt(ctx context.Context) error {
	apiClient, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		Logger.ErrorContext(ctx, "Failed to get docker api client", slog.Any("err", err))
		return err
	}

	Logger.InfoContext(ctx, "Stopping foundry container")
	err = apiClient.ContainerStop(ctx, vttContainerId, container.StopOptions{})
	if err != nil {
		Logger.ErrorContext(ctx, "Error occured while stopping foundry container", slog.Any("err", err))
		return err
	}

	return nil
}

// Get readcloser for logs
// If lines is zero, returns all logs.
func vttLogs(ctx context.Context, lines uint) (io.ReadCloser, error) {
	apiClient, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		Logger.ErrorContext(ctx, "Failed to get docker api client", slog.Any("err", err))
		return nil, err
	}

	opts := container.LogsOptions{
		ShowStdout: true,
		ShowStderr: true,
	}
	if lines != 0 {
		opts.Tail = fmt.Sprint(lines)
	}

	Logger.DebugContext(ctx, "Getting container logs")
	r, err := apiClient.ContainerLogs(ctx, vttContainerId, opts)
	if err != nil {
		Logger.ErrorContext(ctx, "Failed to get foundry container's logs", slog.Any("err", err))
		return nil, err
	}

	return StripAnsi(r), nil
}

func vttStatus(ctx context.Context) ServerStatus {
	status := ServerStatus{}
	status.Site = VTT_URL
	status.Timestamp = time.Now()

	apiClient, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		Logger.ErrorContext(ctx, "Failed to get docker api client", slog.Any("err", err))
		return status
	}

	json, err := apiClient.ContainerInspect(ctx, vttContainerId)
	if err != nil {
		Logger.ErrorContext(ctx, "Error occured while geting foundry container stats", slog.Any("err", err))
		return status
	}

	status.Online = json.State.Running

	return status
}