package privval

import (
	"context"
	"fmt"
	"time"

	"github.com/tendermint/tendermint/crypto"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	"github.com/tendermint/tendermint/types"
)

// RetrySignerClient wraps SignerClient adding retry for each operation (except
// Ping) w/ a timeout.
type RetrySignerClient struct {
	next    *SignerClient
	retries int
	timeout time.Duration
}

// NewRetrySignerClient returns RetrySignerClient. If +retries+ is 0, the
// client will be retrying each operation indefinitely.
func NewRetrySignerClient(sc *SignerClient, retries int, timeout time.Duration) *RetrySignerClient {
	return &RetrySignerClient{sc, retries, timeout}
}

var _ types.PrivValidator = (*RetrySignerClient)(nil)

func (sc *RetrySignerClient) Close() error {
	return sc.next.Close()
}

func (sc *RetrySignerClient) IsConnected() bool {
	return sc.next.IsConnected()
}

func (sc *RetrySignerClient) WaitForConnection(ctx context.Context, maxWait time.Duration) error {
	return sc.next.WaitForConnection(ctx, maxWait)
}

//--------------------------------------------------------
// Implement PrivValidator

func (sc *RetrySignerClient) Ping(ctx context.Context) error {
	return sc.next.Ping(ctx)
}

func (sc *RetrySignerClient) GetPubKey(ctx context.Context) (crypto.PubKey, error) {
	var (
		pk  crypto.PubKey
		err error
	)

	t := time.NewTimer(sc.timeout)
	for i := 0; i < sc.retries || sc.retries == 0; i++ {
		pk, err = sc.next.GetPubKey(ctx)
		if err == nil {
			return pk, nil
		}
		// If remote signer errors, we don't retry.
		if _, ok := err.(*RemoteSignerError); ok {
			return nil, err
		}
		select {
		case <-ctx.Done():
			return nil, ctx.Err()
		case <-t.C:
			t.Reset(sc.timeout)
		}
	}
	return nil, fmt.Errorf("exhausted all attempts to get pubkey: %w", err)
}

func (sc *RetrySignerClient) SignVote(ctx context.Context, chainID string, vote *tmproto.Vote) error {
	var err error
	for i := 0; i < sc.retries || sc.retries == 0; i++ {
		err = sc.next.SignVote(ctx, chainID, vote)
		if err == nil {
			return nil
		}
		// If remote signer errors, we don't retry.
		if _, ok := err.(*RemoteSignerError); ok {
			return err
		}
		time.Sleep(sc.timeout)
	}
	return fmt.Errorf("exhausted all attempts to sign vote: %w", err)
}

func (sc *RetrySignerClient) SignProposal(ctx context.Context, chainID string, proposal *tmproto.Proposal) error {
	var err error
	for i := 0; i < sc.retries || sc.retries == 0; i++ {
		err = sc.next.SignProposal(ctx, chainID, proposal)
		if err == nil {
			return nil
		}
		// If remote signer errors, we don't retry.
		if _, ok := err.(*RemoteSignerError); ok {
			return err
		}
		time.Sleep(sc.timeout)
	}
	return fmt.Errorf("exhausted all attempts to sign proposal: %w", err)
}