const hashes = require('jshashes');
import lbry from 'lbry';
import lbryio from 'lbryio';
import { doShowSnackBar } from 'actions/app';

function rewardMessage(type, amount) {
	return {
		new_developer: __(
			'You earned %s for registering as a new developer.',
			amount
		),
		new_user: __('You earned %s LBC new user reward.', amount),
		confirm_email: __(
			'You earned %s LBC for verifying your email address.',
			amount
		),
		new_channel: __(
			'You earned %s LBC for creating a publisher identity.',
			amount
		),
		first_stream: __(
			'You earned %s LBC for streaming your first video.',
			amount
		),
		many_downloads: __(
			'You earned %s LBC for downloading some of the things.',
			amount
		),
		first_publish: __(
			'You earned %s LBC for making your first publication.',
			amount
		)
	}[type];
}

function toHex(s) {
	let h = '';
	for (var i = 0; i < s.length; i++) {
		let c = s.charCodeAt(i).toString(16);
		if (c.length < 2) {
			c = '0'.concat(c);
		}
		h += c;
	}
	return h;
}

function fromHex(h) {
	let s = '';
	for (let i = 0; i < h.length; i += 2) {
		s += String.fromCharCode(parseInt(h.substr(i, 2), 16));
	}
	return s;
}

function reverseString(s) {
	let o = '';
	for (let i = s.length - 1; i >= 0; i--) {
		o += s[i];
	}
	return o;
}

function pack(num) {
	return (
		'' +
		String.fromCharCode(num & 0xff) +
		String.fromCharCode((num >> 8) & 0xff) +
		String.fromCharCode((num >> 16) & 0xff) +
		String.fromCharCode((num >> 24) & 0xff)
	);
}

// Returns true if claim is an initial claim, false if it's an update to an existing claim
function isInitialClaim(claim) {
	const reversed = reverseString(fromHex(claim.txid));
	const concat = reversed.concat(pack(claim.nout));
	const sha256 = new hashes.SHA256({ utf8: false }).raw(concat);
	const ripemd160 = new hashes.RMD160({ utf8: false }).raw(sha256);
	const hash = toHex(reverseString(ripemd160));
	return hash == claim.claim_id;
}

const rewards = {};

(rewards.TYPE_NEW_DEVELOPER = 'new_developer'), (rewards.TYPE_NEW_USER =
	'new_user'), (rewards.TYPE_CONFIRM_EMAIL =
	'confirm_email'), (rewards.TYPE_FIRST_CHANNEL =
	'new_channel'), (rewards.TYPE_FIRST_STREAM =
	'first_stream'), (rewards.TYPE_MANY_DOWNLOADS =
	'many_downloads'), (rewards.TYPE_FIRST_PUBLISH = 'first_publish');
rewards.TYPE_FEATURED_DOWNLOAD = 'featured_download';

rewards.claimReward = function(type) {
	function requestReward(resolve, reject, params) {
		if (!lbryio.enabled) {
			reject(new Error(__('Rewards are not enabled.')));
			return;
		}
		lbryio.call('reward', 'new', params, 'post').then(({ reward_amount }) => {
			const message = rewardMessage(type, reward_amount),
				result = {
					type: type,
					amount: reward_amount,
					message: message
				};

			// Display global notice
			const action = doShowSnackBar({
				message,
				linkText: __('Show All'),
				linkTarget: '/rewards',
				isError: false
			});
			window.app.store.dispatch(action);

			// Add more events here to display other places

			resolve(result);
		}, reject);
	}

	return new Promise((resolve, reject) => {
		lbry.wallet_unused_address().then(address => {
			const params = {
				reward_type: type,
				wallet_address: address
			};

			switch (type) {
				case rewards.TYPE_FIRST_CHANNEL:
					lbry
						.claim_list_mine()
						.then(function(claims) {
							let claim = claims.find(function(claim) {
								return (
									claim.name.length &&
									claim.name[0] == '@' &&
									claim.txid.length &&
									isInitialClaim(claim)
								);
							});
							if (claim) {
								params.transaction_id = claim.txid;
								requestReward(resolve, reject, params);
							} else {
								reject(
									new Error(__('Please create a channel identity first.'))
								);
							}
						})
						.catch(reject);
					break;

				case rewards.TYPE_FIRST_PUBLISH:
					lbry
						.claim_list_mine()
						.then(claims => {
							let claim = claims.find(function(claim) {
								return (
									claim.name.length &&
									claim.name[0] != '@' &&
									claim.txid.length &&
									isInitialClaim(claim)
								);
							});
							if (claim) {
								params.transaction_id = claim.txid;
								requestReward(resolve, reject, params);
							} else {
								reject(
									claims.length
										? new Error(
												__(
													'Please publish something and wait for confirmation by the network to claim this reward.'
												)
											)
										: new Error(
												__('Please publish something to claim this reward.')
											)
								);
							}
						})
						.catch(reject);
					break;

				case rewards.TYPE_FIRST_STREAM:
				case rewards.TYPE_NEW_USER:
				default:
					requestReward(resolve, reject, params);
			}
		});
	});
};

rewards.claimEligiblePurchaseRewards = function() {
	let types = {};
	types[rewards.TYPE_FIRST_STREAM] = false;
	types[rewards.TYPE_FEATURED_DOWNLOAD] = false;
	types[rewards.TYPE_MANY_DOWNLOADS] = false;
	lbryio.call('reward', 'list', {}).then(
		userRewards => {
			userRewards.forEach(reward => {
				if (types[reward.reward_type] === false && reward.transaction_id) {
					types[reward.reward_type] = true;
				}
			});
			let unclaimedType = Object.keys(types).find(type => {
				return types[type] === false && type !== rewards.TYPE_FEATURED_DOWNLOAD; //handled below
			});
			if (unclaimedType) {
				rewards.claimReward(unclaimedType);
			}
			if (types[rewards.TYPE_FEATURED_DOWNLOAD] === false) {
				rewards.claimReward(rewards.TYPE_FEATURED_DOWNLOAD);
			}
		},
		() => {}
	);
};

export default rewards;