package feeds

import (
	"database/sql/driver"
	"encoding/json"
	"strings"
	"time"

	"github.com/google/uuid"
	"github.com/lib/pq"
	"github.com/pkg/errors"
	"gopkg.in/guregu/null.v4"

	"github.com/smartcontractkit/chainlink/v2/core/utils/crypto"
)

const (
	JobTypeFluxMonitor        = "fluxmonitor"
	JobTypeOffchainReporting  = "ocr"
	JobTypeOffchainReporting2 = "ocr2"
)

type PluginType string

const (
	PluginTypeCommit           PluginType = "COMMIT"
	PluginTypeExecute          PluginType = "EXECUTE"
	PluginTypeMedian           PluginType = "MEDIAN"
	PluginTypeMercury          PluginType = "MERCURY"
	PluginTypeLiquidityManager PluginType = "LIQUIDITYMANAGER"
	PluginTypeUnknown          PluginType = "UNKNOWN"
)

func FromPluginTypeInput(pt PluginType) string {
	return strings.ToLower(string(pt))
}

func ToPluginType(s string) (PluginType, error) {
	switch s {
	case "commit":
		return PluginTypeCommit, nil
	case "execute":
		return PluginTypeExecute, nil
	case "median":
		return PluginTypeMedian, nil
	case "mercury":
		return PluginTypeMercury, nil
	case "liquiditymanager":
		return PluginTypeLiquidityManager, nil
	default:
		return PluginTypeUnknown, errors.New("unknown plugin type")
	}
}

type Plugins struct {
	Commit           bool `json:"commit"`
	Execute          bool `json:"execute"`
	Median           bool `json:"median"`
	Mercury          bool `json:"mercury"`
	LiquidityManager bool `json:"liquiditymanager"`
}

func (p Plugins) Value() (driver.Value, error) {
	return json.Marshal(p)
}

func (p *Plugins) Scan(value interface{}) error {
	b, ok := value.(string)
	if !ok {
		return errors.New("type assertion to []byte failed")
	}

	return json.Unmarshal([]byte(b), &p)
}

type ChainType string

const (
	ChainTypeUnknown  ChainType = "UNKNOWN"
	ChainTypeEVM      ChainType = "EVM"
	ChainTypeStarknet ChainType = "STARKNET"
)

func NewChainType(s string) (ChainType, error) {
	switch s {
	case "EVM":
		return ChainTypeEVM, nil
	case "STARKNET":
		return ChainTypeStarknet, nil
	default:
		return ChainTypeUnknown, errors.New("invalid chain type")
	}
}

// FeedsManager defines a registered Feeds Manager Service and the connection
// information.
type FeedsManager struct {
	ID                 int64
	Name               string
	URI                string
	PublicKey          crypto.PublicKey
	IsConnectionActive bool
	CreatedAt          time.Time
	UpdatedAt          time.Time
}

// ChainConfig defines the chain configuration for a Feeds Manager.
type ChainConfig struct {
	ID                      int64
	FeedsManagerID          int64
	ChainID                 string
	ChainType               ChainType
	AccountAddress          string
	AccountAddressPublicKey null.String
	AdminAddress            string
	FluxMonitorConfig       FluxMonitorConfig
	OCR1Config              OCR1Config
	OCR2Config              OCR2ConfigModel
	CreatedAt               time.Time
	UpdatedAt               time.Time
}

// FluxMonitorConfig defines configuration for FluxMonitorJobs.
type FluxMonitorConfig struct {
	Enabled bool `json:"enabled"`
}

func (c FluxMonitorConfig) Value() (driver.Value, error) {
	return json.Marshal(c)
}

func (c *FluxMonitorConfig) Scan(value interface{}) error {
	b, ok := value.([]byte)
	if !ok {
		return errors.New("type assertion to []byte failed")
	}

	return json.Unmarshal(b, &c)
}

// OCR1Config defines configuration for OCR1 Jobs.
type OCR1Config struct {
	Enabled     bool        `json:"enabled"`
	IsBootstrap bool        `json:"is_bootstrap"`
	Multiaddr   null.String `json:"multiaddr"`
	P2PPeerID   null.String `json:"p2p_peer_id"`
	KeyBundleID null.String `json:"key_bundle_id"`
}

func (c OCR1Config) Value() (driver.Value, error) {
	return json.Marshal(c)
}

func (c *OCR1Config) Scan(value interface{}) error {
	b, ok := value.([]byte)
	if !ok {
		return errors.New("type assertion to []byte failed")
	}

	return json.Unmarshal(b, &c)
}

// OCR2ConfigModel defines configuration for OCR2 Jobs.
type OCR2ConfigModel struct {
	Enabled          bool        `json:"enabled"`
	IsBootstrap      bool        `json:"is_bootstrap"`
	Multiaddr        null.String `json:"multiaddr"`
	ForwarderAddress null.String `json:"forwarder_address"`
	P2PPeerID        null.String `json:"p2p_peer_id"`
	KeyBundleID      null.String `json:"key_bundle_id"`
	Plugins          Plugins     `json:"plugins"`
}

func (c OCR2ConfigModel) Value() (driver.Value, error) {
	return json.Marshal(c)
}

func (c *OCR2ConfigModel) Scan(value interface{}) error {
	b, ok := value.([]byte)
	if !ok {
		return errors.New("type assertion to []byte failed")
	}

	return json.Unmarshal(b, &c)
}

// JobProposalStatus are the status codes that define the stage of a proposal
type JobProposalStatus string

const (
	JobProposalStatusPending   JobProposalStatus = "pending"
	JobProposalStatusApproved  JobProposalStatus = "approved"
	JobProposalStatusRejected  JobProposalStatus = "rejected"
	JobProposalStatusCancelled JobProposalStatus = "cancelled"
	JobProposalStatusDeleted   JobProposalStatus = "deleted"
	JobProposalStatusRevoked   JobProposalStatus = "revoked"
)

// JobProposal represents a proposal which has been sent by a Feeds Manager.
//
// A job proposal has multiple spec versions which are created each time
// the Feeds Manager sends a new proposal version.
type JobProposal struct {
	ID             int64
	Name           null.String
	RemoteUUID     uuid.UUID // RemoteUUID is the uuid of the proposal in FMS.
	Status         JobProposalStatus
	ExternalJobID  uuid.NullUUID // ExternalJobID is the external job id in the job spec.
	FeedsManagerID int64
	Multiaddrs     pq.StringArray
	PendingUpdate  bool
	CreatedAt      time.Time
	UpdatedAt      time.Time
}

// SpecStatus is the status of each proposed spec.
type SpecStatus string

const (
	// SpecStatusPending defines a spec status which has been proposed by the
	// FMS.
	SpecStatusPending SpecStatus = "pending"
	// SpecStatusApproved defines a spec status which the node op has approved.
	// An approved spec is currently being run by the node.
	SpecStatusApproved SpecStatus = "approved"
	// SpecStatusRejected defines a spec status which was proposed, but was
	// rejected by the node op.
	SpecStatusRejected SpecStatus = "rejected"
	// SpecStatusCancelled defines a spec status which was previously approved,
	// but cancelled by the node op. A cancelled spec is not being run by the
	// node.
	SpecStatusCancelled SpecStatus = "cancelled"
	// SpecStatusRevoked defines a spec status which was revoked. A revoked spec cannot be
	// approved.
	SpecStatusRevoked SpecStatus = "revoked"
)

// JobProposalSpec defines a versioned proposed spec for a JobProposal.
type JobProposalSpec struct {
	ID              int64
	Definition      string
	Status          SpecStatus
	Version         int32
	JobProposalID   int64
	StatusUpdatedAt time.Time
	CreatedAt       time.Time
	UpdatedAt       time.Time
}

// CanEditDefinition checks if the spec definition can be edited.
func (s *JobProposalSpec) CanEditDefinition() bool {
	return s.Status == SpecStatusPending ||
		s.Status == SpecStatusCancelled
}

// JobProposalCounts defines the counts for job proposals of each status.
type JobProposalCounts struct {
	Pending   int64
	Cancelled int64
	Approved  int64
	Rejected  int64
	Deleted   int64
	Revoked   int64
}

// toMetrics transforms JobProposalCounts into a map with float64 values for setting metrics
// in prometheus.
func (jpc *JobProposalCounts) toMetrics() map[JobProposalStatus]float64 {
	metrics := make(map[JobProposalStatus]float64, 6)
	metrics[JobProposalStatusPending] = float64(jpc.Pending)
	metrics[JobProposalStatusApproved] = float64(jpc.Approved)
	metrics[JobProposalStatusCancelled] = float64(jpc.Cancelled)
	metrics[JobProposalStatusRejected] = float64(jpc.Rejected)
	metrics[JobProposalStatusRevoked] = float64(jpc.Revoked)
	metrics[JobProposalStatusDeleted] = float64(jpc.Deleted)
	return metrics
}