package sync

import (
	"cloudsave/cmd/cli/tools/prompt"
	"cloudsave/cmd/cli/tools/prompt/credentials"
	"cloudsave/pkg/data"
	"cloudsave/pkg/remote"
	"cloudsave/pkg/remote/client"
	"cloudsave/pkg/repository"
	"cloudsave/pkg/sync"
	"context"
	"flag"
	"fmt"
	"os"
	"time"

	"github.com/google/subcommands"
	"github.com/schollz/progressbar/v3"
)

type (
	SyncCmd struct {
		Service *data.Service
	}
)

func (*SyncCmd) Name() string     { return "sync" }
func (*SyncCmd) Synopsis() string { return "list all game registered" }
func (*SyncCmd) Usage() string {
	return `Usage: cloudsave sync

Synchronize the archives with the server defined for each game.
`
}

func (p *SyncCmd) SetFlags(f *flag.FlagSet) {
}

func (p *SyncCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {

	remoteCred := make(map[string]map[string]string)
	rs, err := remote.All()
	if err != nil {
		fmt.Fprintln(os.Stderr, "error: failed to connect to the remote:", err)
		return subcommands.ExitFailure
	}

	done := make(map[string]struct{})
	for _, r := range rs {
		if _, ok := done[r.URL]; ok {
			continue
		}

		cli, err := connect(remoteCred, r)
		if err != nil {
			fmt.Fprintln(os.Stderr, "error: failed to connect to the remote:", err)
			return subcommands.ExitFailure
		}

		fmt.Println()

		done[r.URL] = struct{}{}
		syncer := sync.NewSyncer(cli, p.Service)

		var pg *progressbar.ProgressBar
		destroyPg := func() {
			pg.Finish()
			pg.Clear()
			pg.Close()
		}

		syncer.SetStateCallback(func(s sync.State, g repository.Metadata) {
			switch s {
			case sync.FetchingMetdata:
				pg = progressbar.New(-1)
				pg.Describe(fmt.Sprintf("%s: fetching metadata from repository", g.Name))
			case sync.Pushing:
				pg.Describe(fmt.Sprintf("%s: pushing data to the server", g.Name))
			case sync.Pulling:
				pg.Describe(fmt.Sprintf("%s: pull data from the server", g.Name))
			case sync.UpToDate:
				destroyPg()
				fmt.Println("🆗", g.Name+": already up-to-date")
			case sync.Pushed:
				destroyPg()
				fmt.Println("⬆️", g.Name+": pushed")
			case sync.Pulled:
				destroyPg()
				fmt.Println("⬇️", g.Name+": pulled")
			}
		})

		syncer.SetErrorCallback(func(err error, g repository.Metadata) {
			destroyPg()
			fmt.Println("❌", g.Name+": "+err.Error())
		})

		syncer.SetConflictCallback(func(a, b repository.Metadata) sync.ConflictResolution {
			fmt.Println()
			fmt.Println("--- ⚠️ CONFLICT ---")
			fmt.Println(a.Name, "(", a.Path, ")")
			fmt.Println("----")
			fmt.Println("Your version:", a.Date.Format(time.RFC1123))
			fmt.Println("Their version:", b.Date.Format(time.RFC1123))
			fmt.Println()

			res := prompt.Conflict()

			switch res {
			case prompt.Their:
				return sync.Their
			case prompt.My:
				return sync.Mine
			}

			return sync.None
		})

		syncer.Sync()
	}

	fmt.Println("done.")
	return subcommands.ExitSuccess
}

func connect(remoteCred map[string]map[string]string, r remote.Remote) (*client.Client, error) {
	var cli *client.Client

	if v, ok := remoteCred[r.URL]; ok {
		cli = client.New(r.URL, v["username"], v["password"])
		return cli, nil
	}

	fmt.Println()
	fmt.Println("Connexion to", r.URL)
	fmt.Println("============")
	username, password, err := credentials.Read(r.URL)
	if err != nil {
		return nil, fmt.Errorf("failed to read std output: %w", err)
	}

	cli = client.New(r.URL, username, password)

	if err := cli.Ping(); err != nil {
		return nil, fmt.Errorf("failed to connect to the remote: %w", err)
	}

	c := make(map[string]string)
	c["username"] = username
	c["password"] = password
	remoteCred[r.URL] = c

	return cli, nil
}