package children

import (
	"context"
	"fmt"
	"isle/bootstrap"
	"isle/daemon/daecommon"
	"isle/garage"
	"isle/garage/garagesrv"
	"net"
	"path/filepath"
	"strconv"

	"code.betamike.com/micropelago/pmux/pmuxlib"
	"dev.mediocregopher.com/mediocre-go-lib.git/mctx"
	"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
)

func garageAdminClientLogger(logger *mlog.Logger) *mlog.Logger {
	return logger.WithNamespace("garageAdminClient")
}

func waitForGarage(
	ctx context.Context,
	logger *mlog.Logger,
	daemonConfig daecommon.Config,
	adminToken string,
	hostBootstrap bootstrap.Bootstrap,
) error {

	allocs := daemonConfig.Storage.Allocations

	// if this host doesn't have any allocations specified then fall back to
	// waiting for nebula
	if len(allocs) == 0 {
		return nil
	}

	adminClientLogger := garageAdminClientLogger(logger)

	for _, alloc := range allocs {

		adminAddr := net.JoinHostPort(
			hostBootstrap.ThisHost().IP().String(),
			strconv.Itoa(alloc.AdminPort),
		)

		adminClient := garage.NewAdminClient(
			adminClientLogger, adminAddr, adminToken,
		)

		ctx := mctx.Annotate(ctx, "garageAdminAddr", adminAddr)
		logger.Debug(ctx, "waiting for garage instance to start")

		if err := adminClient.Wait(ctx); err != nil {
			return fmt.Errorf("waiting for garage instance %q to start up: %w", adminAddr, err)
		}
	}

	return nil

}

func garageWriteChildConfig(
	rpcSecret, runtimeDirPath, adminToken string,
	hostBootstrap bootstrap.Bootstrap,
	alloc daecommon.ConfigStorageAllocation,
) (
	string, error,
) {

	thisHost := hostBootstrap.ThisHost()
	id := daecommon.BootstrapGarageHostForAlloc(thisHost, alloc).ID

	peer := garage.LocalPeer{
		RemotePeer: garage.RemotePeer{
			ID:        id,
			IP:        thisHost.IP().String(),
			RPCPort:   alloc.RPCPort,
			S3APIPort: alloc.S3APIPort,
		},
		AdminPort: alloc.AdminPort,
	}

	garageTomlPath := filepath.Join(
		runtimeDirPath, fmt.Sprintf("garage-%d.toml", alloc.RPCPort),
	)

	err := garagesrv.WriteGarageTomlFile(garageTomlPath, garagesrv.GarageTomlData{
		MetaPath: alloc.MetaPath,
		DataPath: alloc.DataPath,

		RPCSecret:  rpcSecret,
		AdminToken: adminToken,

		LocalPeer:      peer,
		BootstrapPeers: hostBootstrap.GaragePeers(),
	})

	if err != nil {
		return "", fmt.Errorf("creating garage.toml file at %q: %w", garageTomlPath, err)
	}

	return garageTomlPath, nil
}

func garagePmuxProcConfigs(
	ctx context.Context,
	logger *mlog.Logger,
	rpcSecret, runtimeDirPath, binDirPath string,
	daemonConfig daecommon.Config,
	adminToken string,
	hostBootstrap bootstrap.Bootstrap,
) (
	map[string]pmuxlib.ProcessConfig, error,
) {
	var (
		pmuxProcConfigs = map[string]pmuxlib.ProcessConfig{}
		allocs          = daemonConfig.Storage.Allocations
	)

	if len(allocs) > 0 && rpcSecret == "" {
		logger.WarnString(ctx, "Not starting garage instances for storage allocations, missing garage RPC secret")
		return nil, nil
	}

	for _, alloc := range allocs {

		childConfigPath, err := garageWriteChildConfig(
			rpcSecret, runtimeDirPath, adminToken, hostBootstrap, alloc,
		)
		if err != nil {
			return nil, fmt.Errorf("writing child config file for alloc %+v: %w", alloc, err)
		}

		procName := fmt.Sprintf("garage-%d", alloc.RPCPort)
		pmuxProcConfigs[procName] = pmuxlib.ProcessConfig{
			Cmd:  filepath.Join(binDirPath, "garage"),
			Args: []string{"-c", childConfigPath, "server"},
			StartAfterFunc: func(ctx context.Context) error {
				return waitForNebula(ctx, logger, hostBootstrap)
			},
		}
	}

	return pmuxProcConfigs, nil
}