package main

import (
	"context"
	"fmt"
	"os"

	"github.com/spf13/cobra"
	"github.com/tendermint/tendermint/libs/log"
	e2e "github.com/tendermint/tendermint/test/e2e/pkg"
)

var logger = log.NewTMLogger(log.NewSyncWriter(os.Stdout))

func main() {
	NewCLI().Run()
}

// CLI is the Cobra-based command-line interface.
type CLI struct {
	root    *cobra.Command
	testnet *e2e.Testnet
}

// NewCLI sets up the CLI.
func NewCLI() *CLI {
	cli := &CLI{}
	cli.root = &cobra.Command{
		Use:           "runner",
		Short:         "End-to-end test runner",
		SilenceUsage:  true,
		SilenceErrors: true, // we'll output them ourselves in Run()
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			file, err := cmd.Flags().GetString("file")
			if err != nil {
				return err
			}
			testnet, err := e2e.LoadTestnet(file)
			if err != nil {
				return err
			}

			cli.testnet = testnet
			return nil
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			if err := Cleanup(cli.testnet); err != nil {
				return err
			}
			if err := Setup(cli.testnet); err != nil {
				return err
			}

			chLoadResult := make(chan error)
			ctx, loadCancel := context.WithCancel(context.Background())
			defer loadCancel()
			go func() {
				err := Load(ctx, cli.testnet)
				if err != nil {
					logger.Error(fmt.Sprintf("Transaction load failed: %v", err.Error()))
				}
				chLoadResult <- err
			}()

			if err := Start(cli.testnet); err != nil {
				return err
			}
			if err := Perturb(cli.testnet); err != nil {
				return err
			}
			if err := Wait(cli.testnet, 5); err != nil { // allow some txs to go through
				return err
			}

			loadCancel()
			if err := <-chLoadResult; err != nil {
				return err
			}
			if err := Wait(cli.testnet, 10); err != nil { // wait for network to settle before tests
				return err
			}
			if err := Test(cli.testnet); err != nil {
				return err
			}
			if err := Cleanup(cli.testnet); err != nil {
				return err
			}
			return nil
		},
	}

	cli.root.PersistentFlags().StringP("file", "f", "", "Testnet TOML manifest")
	_ = cli.root.MarkPersistentFlagRequired("file")

	cli.root.AddCommand(&cobra.Command{
		Use:   "setup",
		Short: "Generates the testnet directory and configuration",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Setup(cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "start",
		Short: "Starts the Docker testnet, waiting for nodes to become available",
		RunE: func(cmd *cobra.Command, args []string) error {
			_, err := os.Stat(cli.testnet.Dir)
			if os.IsNotExist(err) {
				err = Setup(cli.testnet)
			}
			if err != nil {
				return err
			}
			return Start(cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "perturb",
		Short: "Perturbs the Docker testnet, e.g. by restarting or disconnecting nodes",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Perturb(cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "wait",
		Short: "Waits for a few blocks to be produced and all nodes to catch up",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Wait(cli.testnet, 5)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "stop",
		Short: "Stops the Docker testnet",
		RunE: func(cmd *cobra.Command, args []string) error {
			logger.Info("Stopping testnet")
			return execCompose(cli.testnet.Dir, "down")
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "load",
		Short: "Generates transaction load until the command is cancelled",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Load(context.Background(), cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "test",
		Short: "Runs test cases against a running testnet",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Test(cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "cleanup",
		Short: "Removes the testnet directory",
		RunE: func(cmd *cobra.Command, args []string) error {
			return Cleanup(cli.testnet)
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "logs",
		Short: "Shows the testnet logs",
		RunE: func(cmd *cobra.Command, args []string) error {
			return execComposeVerbose(cli.testnet.Dir, "logs")
		},
	})

	cli.root.AddCommand(&cobra.Command{
		Use:   "tail",
		Short: "Tails the testnet logs",
		RunE: func(cmd *cobra.Command, args []string) error {
			return execComposeVerbose(cli.testnet.Dir, "logs", "--follow")
		},
	})

	return cli
}

// Run runs the CLI.
func (cli *CLI) Run() {
	if err := cli.root.Execute(); err != nil {
		logger.Error(err.Error())
		os.Exit(1)
	}
}