package daemon

import (
	"context"
	"fmt"
	"isle/bootstrap"
	"isle/daemon/daecommon"
	"isle/daemon/network"
)

// getDeprecatedNetworkConfig will return the NetworkConfig configured in the
// deprecated configuration format, or nil if the deprecated format is not used.
//
// In the deprecated format it is not possible to explicitly know which network
// a NetworkConfig is intended for, so the Daemon can only allow a single
// network to be joined when using this format.
//
// DEPRECATED
func getDeprecatedNetworkConfig(
	networkConfigs map[string]daecommon.NetworkConfig,
) *daecommon.NetworkConfig {
	if len(networkConfigs) != 1 {
		return nil
	}

	if c, ok := networkConfigs[daecommon.DeprecatedNetworkID]; ok {
		return &c
	}

	return nil
}

func pickNetworkConfig(
	networkConfigs map[string]daecommon.NetworkConfig,
	creationParams bootstrap.CreationParams,
) *daecommon.NetworkConfig {
	if c := getDeprecatedNetworkConfig(networkConfigs); c != nil {
		return c
	}

	for searchStr, networkConfig := range networkConfigs {
		if creationParams.Matches(searchStr) {
			return &networkConfig
		}
	}

	return nil
}

func validateConfig(
	ctx context.Context,
	networkLoader network.Loader,
	daemonConfig daecommon.Config,
	loadableNetworks []bootstrap.CreationParams,
) error {
	givenConfigs := daemonConfig.Networks
	daemonConfig.Networks = map[string]daecommon.NetworkConfig{}

	for _, creationParams := range loadableNetworks {
		id := creationParams.ID

		if c := pickNetworkConfig(givenConfigs, creationParams); c != nil {
			daemonConfig.Networks[id] = *c
			continue
		}

		c, err := networkLoader.StoredConfig(ctx, id)
		if err != nil {
			return fmt.Errorf("getting stored config for %q: %w", id, err)
		}

		daemonConfig.Networks[id] = c
	}

	return daemonConfig.Validate()
}