package app

import (
	"context"
	"errors"
	"fmt"
	"io"
	"os"
	"sync"

	"coopcloud.tech/abra/cli/internal"
	"coopcloud.tech/abra/client"
	"coopcloud.tech/abra/config"
	"github.com/docker/docker/api/types"
	"github.com/docker/docker/api/types/filters"
	dockerClient "github.com/docker/docker/client"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli/v2"
)

// stackLogs lists logs for all stack services
func stackLogs(stackName string, client *dockerClient.Client) {
	ctx := context.Background()
	filters := filters.NewArgs()
	filters.Add("name", stackName)
	serviceOpts := types.ServiceListOptions{Filters: filters}
	services, err := client.ServiceList(ctx, serviceOpts)
	if err != nil {
		logrus.Fatal(err)
	}

	var wg sync.WaitGroup
	for _, service := range services {
		wg.Add(1)
		go func(s string) {
			logOpts := types.ContainerLogsOptions{
				Details:    true,
				Follow:     true,
				ShowStderr: true,
				ShowStdout: true,
				Tail:       "20",
				Timestamps: true,
			}
			logs, err := client.ServiceLogs(ctx, s, logOpts)
			if err != nil {
				logrus.Fatal(err)
			}
			// defer after err check as any err returns a nil io.ReadCloser
			defer logs.Close()

			_, err = io.Copy(os.Stdout, logs)
			if err != nil && err != io.EOF {
				logrus.Fatal(err)
			}
		}(service.ID)
	}
	wg.Wait()
	os.Exit(0)
}

var appLogsCommand = &cli.Command{
	Name:      "logs",
	ArgsUsage: "[<service>]",
	Usage:     "tail app logs",
	Action: func(c *cli.Context) error {
		appName := c.Args().First()
		if appName == "" {
			internal.ShowSubcommandHelpAndError(c, errors.New("no app name provided"))
		}

		appFiles, err := config.LoadAppFiles("")
		if err != nil {
			logrus.Fatal(err)
		}

		appEnv, err := config.GetApp(appFiles, appName)
		if err != nil {
			logrus.Fatal(err)
		}

		ctx := context.Background()
		server := appFiles[appName].Server
		cl, err := client.New(server)
		if err != nil {
			logrus.Fatal(err)
		}

		serviceName := c.Args().Get(1)
		if serviceName == "" {
			stackLogs(appEnv.StackName(), cl)
		}

		service := fmt.Sprintf("%s_%s", appEnv.StackName(), serviceName)
		filters := filters.NewArgs()
		filters.Add("name", service)
		serviceOpts := types.ServiceListOptions{Filters: filters}
		services, err := cl.ServiceList(ctx, serviceOpts)
		if err != nil {
			logrus.Fatal(err)
		}
		if len(services) != 1 {
			logrus.Fatalf("expected 1 service but got %v", len(services))
		}

		logOpts := types.ContainerLogsOptions{
			Details:    true,
			Follow:     true,
			ShowStderr: true,
			ShowStdout: true,
			Tail:       "20",
			Timestamps: true,
		}
		logs, err := cl.ServiceLogs(ctx, services[0].ID, logOpts)
		if err != nil {
			logrus.Fatal(err)
		}
		// defer after err check as any err returns a nil io.ReadCloser
		defer logs.Close()

		_, err = io.Copy(os.Stdout, logs)
		if err != nil && err != io.EOF {
			logrus.Fatal(err)
		}

		return nil
	},
}