import * as types from 'constants/action_types';

const reducers = {};
const address = localStorage.getItem('receiveAddress');
const buildDraftTransaction = () => ({
	amount: undefined,
	address: undefined
});

const defaultState = {
	balance: 0,
	transactions: [],
	fetchingTransactions: false,
	receiveAddress: address,
	gettingNewAddress: false,
	draftTransaction: buildDraftTransaction()
};

reducers[types.FETCH_TRANSACTIONS_STARTED] = function(state, action) {
	return Object.assign({}, state, {
		fetchingTransactions: true
	});
};

reducers[types.FETCH_TRANSACTIONS_COMPLETED] = function(state, action) {
	const oldTransactions = Object.assign({}, state.transactions);
	const byId = Object.assign({}, oldTransactions.byId);
	const { transactions } = action.data;

	transactions.forEach(transaction => {
		byId[transaction.txid] = transaction;
	});

	const newTransactions = Object.assign({}, oldTransactions, {
		byId: byId
	});

	return Object.assign({}, state, {
		transactions: newTransactions,
		fetchingTransactions: false
	});
};

reducers[types.GET_NEW_ADDRESS_STARTED] = function(state, action) {
	return Object.assign({}, state, {
		gettingNewAddress: true
	});
};

reducers[types.GET_NEW_ADDRESS_COMPLETED] = function(state, action) {
	const { address } = action.data;

	localStorage.setItem('receiveAddress', address);
	return Object.assign({}, state, {
		gettingNewAddress: false,
		receiveAddress: address
	});
};

reducers[types.UPDATE_BALANCE] = function(state, action) {
	return Object.assign({}, state, {
		balance: action.data.balance
	});
};

reducers[types.CHECK_ADDRESS_IS_MINE_STARTED] = function(state, action) {
	return Object.assign({}, state, {
		checkingAddressOwnership: true
	});
};

reducers[types.CHECK_ADDRESS_IS_MINE_COMPLETED] = function(state, action) {
	return Object.assign({}, state, {
		checkingAddressOwnership: false
	});
};

reducers[types.SET_DRAFT_TRANSACTION_AMOUNT] = function(state, action) {
	const oldDraft = state.draftTransaction;
	const newDraft = Object.assign({}, oldDraft, {
		amount: parseFloat(action.data.amount)
	});

	return Object.assign({}, state, {
		draftTransaction: newDraft
	});
};

reducers[types.SET_DRAFT_TRANSACTION_ADDRESS] = function(state, action) {
	const oldDraft = state.draftTransaction;
	const newDraft = Object.assign({}, oldDraft, {
		address: action.data.address
	});

	return Object.assign({}, state, {
		draftTransaction: newDraft
	});
};

reducers[types.SEND_TRANSACTION_STARTED] = function(state, action) {
	const newDraftTransaction = Object.assign({}, state.draftTransaction, {
		sending: true
	});

	return Object.assign({}, state, {
		draftTransaction: newDraftTransaction
	});
};

reducers[types.SEND_TRANSACTION_COMPLETED] = function(state, action) {
	return Object.assign({}, state, {
		draftTransaction: buildDraftTransaction()
	});
};

reducers[types.SEND_TRANSACTION_FAILED] = function(state, action) {
	const newDraftTransaction = Object.assign({}, state.draftTransaction, {
		sending: false,
		error: action.data.error
	});

	return Object.assign({}, state, {
		draftTransaction: newDraftTransaction
	});
};

export default function reducer(state = defaultState, action) {
	const handler = reducers[action.type];
	if (handler) return handler(state, action);
	return state;
}