package store

import (
	"errors"

	"github.com/libp2p/go-libp2p/core/peer"
	"github.com/multiformats/go-multiaddr"
	"github.com/waku-org/go-waku/waku/v2/peermanager"
	"github.com/waku-org/go-waku/waku/v2/protocol"
)

type Parameters struct {
	selectedPeer      peer.ID
	peerAddr          multiaddr.Multiaddr
	peerSelectionType peermanager.PeerSelection
	preferredPeers    peer.IDSlice
	requestID         []byte
	cursor            []byte
	pageLimit         uint64
	forward           bool
	includeData       bool
	skipRatelimit     bool
}

func (p *Parameters) Cursor() []byte {
	return p.cursor
}

type RequestOption func(*Parameters) error

// WithPeer is an option used to specify the peerID to request the message history.
// Note that this option is mutually exclusive to WithPeerAddr, only one of them can be used.
func WithPeer(p peer.ID) RequestOption {
	return func(params *Parameters) error {
		params.selectedPeer = p
		if params.peerAddr != nil {
			return errors.New("WithPeer and WithPeerAddr options are mutually exclusive")
		}
		return nil
	}
}

// WithPeerAddr is an option used to specify a peerAddress to request the message history.
// This new peer will be added to peerStore.
// Note that this option is mutually exclusive to WithPeerAddr, only one of them can be used.
func WithPeerAddr(pAddr multiaddr.Multiaddr) RequestOption {
	return func(params *Parameters) error {
		params.peerAddr = pAddr
		if params.selectedPeer != "" {
			return errors.New("WithPeerAddr and WithPeer options are mutually exclusive")
		}
		return nil
	}
}

// WithAutomaticPeerSelection is an option used to randomly select a peer from the peer store
// to request the message history. If a list of specific peers is passed, the peer will be chosen
// from that list assuming it supports the chosen protocol, otherwise it will chose a peer
// from the node peerstore
// Note: This option is avaiable only with peerManager
func WithAutomaticPeerSelection(fromThesePeers ...peer.ID) RequestOption {
	return func(params *Parameters) error {
		params.peerSelectionType = peermanager.Automatic
		params.preferredPeers = fromThesePeers
		return nil
	}
}

// WithFastestPeerSelection is an option used to select a peer from the peer store
// with the lowest ping. If a list of specific peers is passed, the peer will be chosen
// from that list assuming it supports the chosen protocol, otherwise it will chose a peer
// from the node peerstore
// Note: This option is avaiable only with peerManager
func WithFastestPeerSelection(fromThesePeers ...peer.ID) RequestOption {
	return func(params *Parameters) error {
		params.peerSelectionType = peermanager.LowestRTT
		return nil
	}
}

// WithRequestID is an option to set a specific request ID to be used when
// creating a store request
func WithRequestID(requestID []byte) RequestOption {
	return func(params *Parameters) error {
		params.requestID = requestID
		return nil
	}
}

// WithAutomaticRequestID is an option to automatically generate a request ID
// when creating a store request
func WithAutomaticRequestID() RequestOption {
	return func(params *Parameters) error {
		params.requestID = protocol.GenerateRequestID()
		return nil
	}
}

func WithCursor(cursor []byte) RequestOption {
	return func(params *Parameters) error {
		params.cursor = cursor
		return nil
	}
}

// WithPaging is an option used to specify the order and maximum number of records to return
func WithPaging(forward bool, limit uint64) RequestOption {
	return func(params *Parameters) error {
		params.forward = forward
		params.pageLimit = limit
		return nil
	}
}

// IncludeData is an option used to indicate whether you want to return the message content or not
func IncludeData(v bool) RequestOption {
	return func(params *Parameters) error {
		params.includeData = v
		return nil
	}
}

// Skips the rate limiting for the current request (might cause the store request to fail with TOO_MANY_REQUESTS (429))
func SkipRateLimit() RequestOption {
	return func(params *Parameters) error {
		params.skipRatelimit = true
		return nil
	}
}

// Default options to be used when querying a store node for results
func DefaultOptions() []RequestOption {
	return []RequestOption{
		WithAutomaticRequestID(),
		WithAutomaticPeerSelection(),
		WithPaging(true, DefaultPageSize),
		IncludeData(true),
	}
}