package saltyim

import (
	"bytes"
	"fmt"
	"os"

	log "github.com/sirupsen/logrus"
)

// WithClientIdentity sets the client's identity
func WithClientIdentity(options ...IdentityOption) ClientOption {
	return func(cli *Client) error {
		id, err := GetIdentity(options...)
		if err != nil {
			return fmt.Errorf("error loading identity: %w", err)
		}
		cli.id = id
		cli.key = id.key
		return nil
	}
}

// WithStateFromFile sets the client's state from a file on disk
func WithStateFromFile(fn string) ClientOption {
	return func(cli *Client) error {
		f, err := os.Open(fn)
		if err != nil {
			log.WithError(err).Warnf("error opening state file %s, creating an empty state", fn)
			cli.state = NewState()
			return nil
		}
		defer f.Close()

		s, err := LoadState(f)
		if err != nil {
			return fmt.Errorf("error loading state: %w", err)
		}
		cli.state = s

		return nil
	}
}

// WithStateFromBytes sets the client's state from a byte array
func WithStateFromBytes(data []byte) ClientOption {
	return func(cli *Client) error {
		s, err := LoadState(bytes.NewBuffer(data))
		if err != nil {
			return fmt.Errorf("error loading state: %w", err)
		}
		cli.state = s

		return nil
	}
}

// WithState sets the client's state from a state object
func WithState(state *State) ClientOption {
	return func(cli *Client) error {
		cli.state = state
		return nil
	}
}