package command

import (
	"context"
	"errors"
	"os"

	"github.com/owncloud/ocis/ocis-pkg/clihelper"
	ociscfg "github.com/owncloud/ocis/ocis-pkg/config"
	"github.com/owncloud/ocis/ocis-pkg/config/envdecode"
	"github.com/owncloud/ocis/ocis-pkg/version"
	"github.com/owncloud/ocis/proxy/pkg/config"
	"github.com/thejerf/suture/v4"
	"github.com/urfave/cli/v2"
)

// GetCommands provides all commands for this service
func GetCommands(cfg *config.Config) cli.Commands {
	return []*cli.Command{
		// start this service
		Server(cfg),

		// interaction with this service

		// infos about this service
		Health(cfg),
		Version(cfg),
	}
}

// Execute is the entry point for the ocis-proxy command.
func Execute(cfg *config.Config) error {
	app := clihelper.DefaultApp(&cli.App{
		Name:  "ocis-proxy",
		Usage: "proxy for oCIS",

		Before: func(c *cli.Context) error {
			cfg.Service.Version = version.String
			return ParseConfig(c, cfg)
		},

		Commands: GetCommands(cfg),
	})

	cli.HelpFlag = &cli.BoolFlag{
		Name:  "help,h",
		Usage: "Show the help",
	}

	return app.Run(os.Args)
}

// ParseConfig loads accounts configuration from known paths.
func ParseConfig(c *cli.Context, cfg *config.Config) error {
	_, err := ociscfg.BindSourcesToStructs(cfg.Service.Name, cfg)
	if err != nil {
		return err
	}

	// provide with defaults for shared logging, since we need a valid destination address for BindEnv.
	if cfg.Log == nil && cfg.Commons != nil && cfg.Commons.Log != nil {
		cfg.Log = &config.Log{
			Level:  cfg.Commons.Log.Level,
			Pretty: cfg.Commons.Log.Pretty,
			Color:  cfg.Commons.Log.Color,
			File:   cfg.Commons.Log.File,
		}
	} else if cfg.Log == nil && cfg.Commons == nil {
		cfg.Log = &config.Log{}
	}

	// load all env variables relevant to the config in the current context.
	if err := envdecode.Decode(cfg); err != nil {
		// no environment variable set for this config is an expected "error"
		if !errors.Is(err, envdecode.ErrNoTargetFieldsAreSet) {
			return err
		}
	}

	return nil
}

// SutureService allows for the proxy command to be embedded and supervised by a suture supervisor tree.
type SutureService struct {
	cfg *config.Config
}

// NewSutureService creates a new proxy.SutureService
func NewSutureService(cfg *ociscfg.Config) suture.Service {
	cfg.Proxy.Commons = cfg.Commons
	return SutureService{
		cfg: cfg.Proxy,
	}
}

func (s SutureService) Serve(ctx context.Context) error {
	s.cfg.Context = ctx
	if err := Execute(s.cfg); err != nil {
		return err
	}

	return nil
}