package keeper

import (
	"errors"
	"fmt"
	"net/url"

	"cosmossdk.io/collections"
	errorsmod "cosmossdk.io/errors"
	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"

	auctiontypes "git.vdb.to/cerc-io/laconic2d/x/auction"
	registrytypes "git.vdb.to/cerc-io/laconic2d/x/registry"
	"git.vdb.to/cerc-io/laconic2d/x/registry/helpers"
)

// HasNameAuthority - checks if a name/authority exists.
func (k Keeper) HasNameAuthority(ctx sdk.Context, name string) (bool, error) {
	has, err := k.Authorities.Has(ctx, name)
	if err != nil {
		return false, err
	}

	return has, nil
}

// GetNameAuthority - gets a name authority from the store.
func (k Keeper) GetNameAuthority(ctx sdk.Context, name string) (registrytypes.NameAuthority, error) {
	authority, err := k.Authorities.Get(ctx, name)
	if err != nil {
		if errors.Is(err, collections.ErrNotFound) {
			return registrytypes.NameAuthority{}, errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Name authority not found.")
		}
		return registrytypes.NameAuthority{}, err
	}

	return authority, nil
}

// HasNameRecord - checks if a name record exists.
func (k Keeper) HasNameRecord(ctx sdk.Context, crn string) bool {
	panic("unimplemented")
}

// GetNameRecord - gets a name record from the store.
func (k Keeper) GetNameRecord(ctx sdk.Context, crn string) *registrytypes.NameRecord {
	panic("unimplemented")
}

// ListNameRecords - get all name records.
func (k Keeper) ListNameRecords(ctx sdk.Context) []registrytypes.NameEntry {
	panic("unimplemented")
}

// ProcessSetName creates a CRN -> Record ID mapping.
func (k Keeper) ProcessSetName(ctx sdk.Context, msg registrytypes.MsgSetName) error {
	panic("unimplemented")
}

// SaveNameAuthority creates the NameAuthority record.
func (k Keeper) SaveNameAuthority(ctx sdk.Context, name string, authority *registrytypes.NameAuthority) error {
	return k.Authorities.Set(ctx, name, *authority)

	// TODO
	// updateBlockChangeSetForNameAuthority(ctx, codec, store, name)
}

// ProcessReserveAuthority reserves a name authority.
func (k Keeper) ReserveAuthority(ctx sdk.Context, msg registrytypes.MsgReserveAuthority) error {
	crn := fmt.Sprintf("crn://%s", msg.GetName())
	parsedCrn, err := url.Parse(crn)
	if err != nil {
		return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Invalid name")
	}

	name := parsedCrn.Host
	if fmt.Sprintf("crn://%s", name) != crn {
		return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Invalid name")
	}

	// TODO
	// if strings.Contains(name, ".") {
	// 	return k.ProcessReserveSubAuthority(ctx, name, msg)
	// }

	err = k.createAuthority(ctx, name, msg.GetSigner(), true)
	if err != nil {
		return err
	}

	return nil
}

func (k Keeper) createAuthority(ctx sdk.Context, name string, owner string, isRoot bool) error {
	moduleParams, err := k.GetParams(ctx)
	if err != nil {
		return err
	}

	has, err := k.HasNameAuthority(ctx, name)
	if err != nil {
		return err
	}
	if has {
		authority, err := k.GetNameAuthority(ctx, name)
		if err != nil {
			return err
		}

		if authority.Status != registrytypes.AuthorityExpired {
			return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Name already reserved.")
		}
	}

	ownerAddress, err := sdk.AccAddressFromBech32(owner)
	if err != nil {
		return errorsmod.Wrap(sdkerrors.ErrInvalidRequest, "Invalid owner address.")
	}
	ownerAccount := k.accountKeeper.GetAccount(ctx, ownerAddress)
	if ownerAccount == nil {
		return errorsmod.Wrap(sdkerrors.ErrUnknownAddress, "Owner account not found.")
	}

	authority := registrytypes.NameAuthority{
		OwnerPublicKey: getAuthorityPubKey(ownerAccount.GetPubKey()),
		OwnerAddress:   owner,
		Height:         uint64(ctx.BlockHeight()),
		Status:         registrytypes.AuthorityActive,
		AuctionId:      "",
		BondId:         "",
		ExpiryTime:     ctx.BlockTime().Add(moduleParams.AuthorityGracePeriod),
	}

	if isRoot && moduleParams.AuthorityAuctionEnabled {
		// If auctions are enabled, clear out owner fields. They will be set after a winner is picked.
		authority.OwnerAddress = ""
		authority.OwnerPublicKey = ""
		// Reset bond ID if required.
		if authority.BondId != "" || len(authority.BondId) != 0 {
			// TODO
			// k.RemoveBondToAuthorityIndexEntry(ctx, authority.BondId, name)
			authority.BondId = ""
		}

		params := auctiontypes.Params{
			CommitsDuration: moduleParams.AuthorityAuctionCommitsDuration,
			RevealsDuration: moduleParams.AuthorityAuctionRevealsDuration,
			CommitFee:       moduleParams.AuthorityAuctionCommitFee,
			RevealFee:       moduleParams.AuthorityAuctionRevealFee,
			MinimumBid:      moduleParams.AuthorityAuctionMinimumBid,
		}

		// Create an auction.
		msg := auctiontypes.NewMsgCreateAuction(params, ownerAddress)

		auction, sdkErr := k.auctionKeeper.CreateAuction(ctx, msg)
		if sdkErr != nil {
			return sdkErr
		}

		// TODO
		// Create auction ID -> authority name index.
		// k.AddAuctionToAuthorityMapping(ctx, auction.Id, name)

		authority.Status = registrytypes.AuthorityUnderAuction
		authority.AuctionId = auction.Id
		authority.ExpiryTime = auction.RevealsEndTime.Add(moduleParams.AuthorityGracePeriod)
	}

	// Save name authority in store.
	if err = k.SaveNameAuthority(ctx, name, &authority); err != nil {
		return err
	}

	// TODO
	// k.InsertAuthorityExpiryQueue(ctx, name, authority.ExpiryTime)

	return nil
}

func (k Keeper) ProcessSetAuthorityBond(ctx sdk.Context, msg registrytypes.MsgSetAuthorityBond) error {
	panic("unimplemented")
}

// ProcessDeleteName removes a CRN -> Record ID mapping.
func (k Keeper) ProcessDeleteName(ctx sdk.Context, msg registrytypes.MsgDeleteNameAuthority) error {
	panic("unimplemented")
}

func (k Keeper) GetAuthorityExpiryQueue(ctx sdk.Context) []*registrytypes.ExpiryQueueRecord {
	panic("unimplemented")
}

// ResolveCRN resolves a CRN to a record.
func (k Keeper) ResolveCRN(ctx sdk.Context, crn string) *registrytypes.Record {
	panic("unimplemented")
}

func getAuthorityPubKey(pubKey cryptotypes.PubKey) string {
	if pubKey == nil {
		return ""
	}

	return helpers.BytesToBase64(pubKey.Bytes())
}