<script>
import { onMount } from "svelte";
import { formatDataVolume, formatDate } from "util/Formatting";
import Euro from "util/Euro.svelte"
import { loading_finish, loading_start } from "lib/Loading";

let year = 0
let month = 0
let month_str = $state("")
let transactions = $state({
	rows: [],
	total_subscription_charge: 0,
	total_storage_used: 0,
	total_storage_charge: 0,
	total_bandwidth_used: 0,
	total_bandwidth_charge: 0,
	total_affiliate_amount: 0,
	total_deposited: 0,
	total_deducted: 0,
})

const load_transactions = async () => {
	loading_start()
	month_str = year + "-" + ("00"+(month)).slice(-2)
	try {
		const resp = await fetch(window.api_endpoint+"/user/transactions/"+month_str)
		if(resp.status >= 400) {
			let json = await resp.json()
			if (json.value === "authentication_failed") {
				window.location = "/login"
				return
			} else {
				throw new Error(json.message)
			}
		}

		let month = {
			rows: await resp.json(),
			total_subscription_charge: 0,
			total_storage_used: 0,
			total_storage_charge: 0,
			total_bandwidth_used: 0,
			total_bandwidth_charge: 0,
			total_affiliate_amount: 0,
			total_deposited: 0,
			total_deducted: 0,
		}

		month.rows.forEach(row => {
			row.time = new Date(row.time)
			month.total_deposited += row.deposit_amount
			month.total_subscription_charge += row.subscription_charge
			month.total_storage_used += row.storage_used
			month.total_storage_charge += row.storage_charge
			month.total_bandwidth_used += row.bandwidth_used
			month.total_bandwidth_charge += row.bandwidth_charge
			month.total_affiliate_amount += row.affiliate_amount
			month.total_deducted += row.subscription_charge + row.storage_charge + row.bandwidth_charge
		})

		// Divide the total storage usage by the number of days in a month
		month.total_storage_used /= 30.4375

		transactions = month
	} catch (err) {
		alert(err)
	} finally {
		loading_finish()
	}
};
const last_month = () => {
	month--
	if (month === 0) {
		month = 12
		year--
	}

	load_transactions()
}
const next_month = () => {
	month++
	if (month === 13) {
		month = 1
		year++
	}

	load_transactions()
}

onMount(() => {
	let now = new Date()
	year = now.getFullYear()
	month = now.getMonth()+1
	load_transactions()
})
</script>

<section>
	<h2>Transaction log</h2>
	<p>
		Here is a log of all transactions on your account balance. Usage is
		calculated per day. The storage charge is divided by the average number
		of days in a month (30.4375).
	</p>
	<p>
		Example: If you have 2 TB stored on your Nova account at €4 per TB
		then the daily charge will be:<br/>

		2 TB * € 4 = € 8<br/>

		€ 8 / 30.4375 = € 0.2628 per day
	</p>

	<h3>{month_str}</h3>
	<div class="toolbar">
		<button onclick={last_month}>
			<i class="icon">chevron_left</i>
			Previous month
		</button>
		<div class="toolbar_spacer"></div>
		<button onclick={next_month}>
			Next month
			<i class="icon">chevron_right</i>
		</button>
	</div>
	<ul>
		<li>
			Subscription charge: <Euro amount={transactions.total_subscription_charge} precision="4"/>
		</li>
		<li>
			Storage charge: <Euro amount={transactions.total_storage_charge} precision="4"/>
			(used {formatDataVolume(transactions.total_storage_used, 3)})
		</li>
		<li>
			Bandwidth charge: <Euro amount={transactions.total_bandwidth_charge} precision="4"/>
			(used {formatDataVolume(transactions.total_bandwidth_used, 3)})
		</li>
		<li>
			Total charge: <Euro amount={transactions.total_deducted} precision="4"/>
		</li>
		<li>
			Affiliate rewards: <Euro amount={transactions.total_affiliate_amount} precision="4"/>
		</li>
		<li>
			Deposited: <Euro amount={transactions.total_deposited} precision="4"/>
		</li>
	</ul>

	<div class="table_scroll">
		<table style="text-align: left;">
			<thead>
				<tr>
					<td>Time</td>
					<td>Balance</td>
					<td>Subscription</td>
					<td>Storage</td>
					<td>Bandwidth</td>
					<td>Affiliate</td>
					<td>Deposit</td>
				</tr>
			</thead>
			<tbody>
				{#each transactions.rows as row}
					<tr>
						<td>
							{formatDate(row.time, true, true, false)}
						</td>
						<td>
							<Euro amount={row.new_balance}></Euro>
						</td>
						<td>
							<Euro amount={row.subscription_charge} precision="6"/>
						</td>
						<td>
							<Euro amount={row.storage_charge} precision="6"/>
							({formatDataVolume(row.storage_used, 3)})
						</td>
						<td>
							<Euro amount={row.bandwidth_charge} precision="6"/>
							({formatDataVolume(row.bandwidth_used, 3)})
						</td>
						<td>
							<Euro amount={row.affiliate_amount} precision="6"/>
							({row.affiliate_count})
						</td>
						<td>
							<Euro amount={row.deposit_amount}/>
						</td>
					</tr>
				{/each}
			</tbody>
		</table>
	</div>
</section>

<style>
.toolbar {
	display: flex;
	flex-direction: row;
	width: 100%;
}
.toolbar > * { flex: 0 0 auto; }
.toolbar_spacer { flex: 1 1 auto; }
</style>
