/*
Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/

package views

import (
	"encoding/json"
	"fmt"

	"github.com/LFDT-Panurus/panurus/token"
	"github.com/LFDT-Panurus/panurus/token/services/ttx/multisig"
	token2 "github.com/LFDT-Panurus/panurus/token/token"
	"github.com/hyperledger-labs/fabric-smart-client/pkg/utils/errors"
	"github.com/hyperledger-labs/fabric-smart-client/platform/common/utils/assert"
	"github.com/hyperledger-labs/fabric-smart-client/platform/common/utils/collections/iterators"
	"github.com/hyperledger-labs/fabric-smart-client/platform/view/view"
)

type BalanceQuery struct {
	TMSID     *token.TMSID
	SkipCheck bool
	Wallet    string
	Type      token2.Type
}

type Balance struct {
	Type     token2.Type
	Quantity string
	CoOwned  string
}

type BalanceView struct {
	*BalanceQuery
}

func (b *BalanceView) Call(context view.Context) (any, error) {
	tms, err := token.GetManagementService(context, ServiceOpts(b.TMSID)...)
	assert.NoError(err, "failed getting management service")
	assert.NotNil(tms, "TMSID is nil")
	wallet, err := tms.WalletManager().OwnerWallet(context.Context(), b.Wallet)
	if err != nil {
		return nil, fmt.Errorf("wallet %s not found: %w", b.Wallet, err)
	}

	unspentTokens, err := wallet.ListUnspentTokensIterator(context.Context(), token.WithType(b.Type))
	if err != nil {
		return nil, errors.Wrapf(err, "failed listing unspent tokens")
	}
	precision := tms.PublicParametersManager().PublicParameters().Precision()
	sum, err := iterators.Reduce(unspentTokens.UnspentTokensIterator, token2.ToQuantitySum(precision))
	if err != nil {
		return nil, err
	}

	// co-owned
	multisigWallet := multisig.Wallet(context, wallet)
	coOwnedTokens, err := multisigWallet.ListTokensIterator(context.Context(), token.WithType(b.Type))
	assert.NoError(err, "failed to get co-owned tokens")
	coOwned, err := iterators.Reduce(coOwnedTokens, token2.ToQuantitySum(precision))
	assert.NoError(err, "failed to compute the sum of the co-owned tokens")

	if !b.SkipCheck {
		balance, err := wallet.Balance(context.Context(), token.WithType(b.Type))
		if err != nil {
			return nil, err
		}
		if sum.ToBigInt().Cmp(balance) != 0 {
			return nil, errors.Errorf("balance doesn't match [%s]!=[%s]", balance.String(), sum.Decimal())
		}
	}

	return Balance{
		Quantity: sum.Decimal(),
		CoOwned:  coOwned.Decimal(),
		Type:     b.Type,
	}, nil
}

type BalanceViewFactory struct{}

func (g *BalanceViewFactory) NewView(in []byte) (view.View, error) {
	f := &BalanceView{BalanceQuery: &BalanceQuery{}}
	if err := json.Unmarshal(in, f.BalanceQuery); err != nil {
		return nil, err
	}

	return f, nil
}

type CoOwnedBalanceQuery struct {
	TMSID  *token.TMSID
	Wallet string
	Type   token2.Type
}

type CoOwnedBalanceView struct {
	*CoOwnedBalanceQuery
}

func (b *CoOwnedBalanceView) Call(context view.Context) (any, error) {
	tms, err := token.GetManagementService(context, ServiceOpts(b.TMSID)...)
	assert.NoError(err, "failed getting management service")
	wallet, err := tms.WalletManager().OwnerWallet(context.Context(), b.Wallet)
	if err != nil {
		return nil, fmt.Errorf("wallet %s not found: %w", b.Wallet, err)
	}

	// co-owned
	precision := tms.PublicParametersManager().PublicParameters().Precision()
	multisigWallet := multisig.Wallet(context, wallet)
	coOwnedTokens, err := multisigWallet.ListTokensIterator(context.Context(), token.WithType(b.Type))
	assert.NoError(err, "failed to get co-owned tokens")
	coOwned, err := iterators.Reduce(coOwnedTokens, token2.ToQuantitySum(precision))
	assert.NoError(err, "failed to compute the sum of the co-owned tokens")

	return Balance{
		Quantity: coOwned.Decimal(),
		Type:     b.Type,
	}, nil
}

type CoOwnedBalanceViewFactory struct{}

func (g *CoOwnedBalanceViewFactory) NewView(in []byte) (view.View, error) {
	f := &CoOwnedBalanceView{CoOwnedBalanceQuery: &CoOwnedBalanceQuery{}}
	if err := json.Unmarshal(in, f.CoOwnedBalanceQuery); err != nil {
		return nil, err
	}

	return f, nil
}