{#  DrCr: Web-based double-entry bookkeeping framework
    Copyright (C) 2022–2023  Lee Yingtong Li (RunasSudo)

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
#}

{% extends 'base.html' %}
{% block title %}{{ 'Edit' if transaction else 'New' }} transaction{% endblock %}

{% block content %}
	<h1 class="h2 my-4">{{ 'Edit' if transaction else 'New' }} transaction</h1>
	
	<form method="POST">
		<table class="table">
			<thead>
				<tr>
					<th>Date</th>
					<th colspan="2">Description</th>
					<th>Dr</th>
					<th>Cr</th>
				</tr>
			</thead>
			<tbody>
				<tr>
					<td><input type="date" name="dt" class="form-control" value="{{ transaction.dt.strftime('%Y-%m-%d') if transaction else '' }}"></td>
					<td colspan="2"><input type="text" name="description" value="{{ transaction.description if transaction else '' }}" class="form-control"></td>
					<td></td>
					<td></td>
				</tr>
				{% if transaction %}
					{% for posting in transaction.postings %}
						<tr>
							<td></td>
							<td></td>
							<td>
								<div class="input-group">
									<select class="form-select" name="sign" style="flex-grow:0;min-width:5em" onchange="changeDrCr(this)">
										<option value="dr"{% if posting.quantity >= 0 %} selected{% endif %}>Dr</option>
										<option value="cr"{% if posting.quantity < 0 %} selected{% endif %}>Cr</option>
									</select>
									<input type="text" name="account" class="form-control" value="{{ posting.account }}">
									<a class="btn btn-outline-primary" href="#" onclick="addPosting(this);return false;"><i class="bi bi-plus-circle-fill"></i></a>
								</div>
							</td>
							{% if posting.quantity >= 0 %}
								<td class="amount-dr has-amount">
									<div class="input-group">
										<div class="input-group-text">$</div>
										<input type="text" name="amount" value="{{ posting.amount().quantity_string() }}" class="form-control" oninput="changeAmount(this)">
									</div>
								</td>
								<td class="amount-cr"></td>
							{% else %}
								<td class="amount-dr"></td>
								<td class="amount-cr has-amount">
									<div class="input-group">
										<div class="input-group-text">$</div>
										<input type="text" name="amount" value="{{ (posting.amount()|abs).quantity_string() }}" class="form-control" oninput="changeAmount(this)">
									</div>
								</td>
							{% endif %}
						</tr>
					{% endfor %}
				{% else %}
					<tr>
						<td></td>
						<td></td>
						<td>
							<div class="input-group">
								<select class="form-select" name="sign" style="flex-grow:0;min-width:5em" onchange="changeDrCr(this)">
									<option value="dr" selected>Dr</option>
									<option value="cr">Cr</option>
								</select>
								<input type="text" name="account" class="form-control">
								<a class="btn btn-outline-primary" href="#" onclick="addPosting(this);return false;"><i class="bi bi-plus-circle-fill"></i></a>
							</div>
						</td>
						<td class="amount-dr has-amount">
							<div class="input-group">
								<div class="input-group-text">$</div>
								<input type="text" name="amount" class="form-control" oninput="changeAmount(this)">
							</div>
						</td>
						<td class="amount-cr"></td>
					</tr>
					<tr>
						<td></td>
						<td></td>
						<td>
							<div class="input-group">
								<select class="form-select" name="sign" style="flex-grow:0;min-width:5em" onchange="changeDrCr(this)">
									<option value="dr">Dr</option>
									<option value="cr" selected>Cr</option>
								</select>
								<input type="text" name="account" class="form-control">
								<a class="btn btn-outline-primary" href="#" onclick="addPosting(this);return false;"><i class="bi bi-plus-circle-fill"></i></a>
							</div>
						</td>
						<td class="amount-dr"></td>
						<td class="amount-cr has-amount">
							<div class="input-group">
								<div class="input-group-text">$</div>
								<input type="text" name="amount" class="form-control" oninput="changeAmount(this)">
							</div>
						</td>
					</tr>
				{% endif %}
			</tbody>
		</table>
		
		<div class="d-flex justify-content-end">
			<button type="submit" class="btn btn-primary">Save</button>
		</div>
	</form>
{% endblock %}

{% block scripts %}
	<script>
		function changeDrCr(el) {
			let trPosting = el.parentNode.parentNode.parentNode;
			let amountContent = trPosting.querySelector('.has-amount').innerHTML;
			let amountValue = trPosting.querySelector('.has-amount input').value;
			
			// Remove input boxes
			for (let td of trPosting.querySelectorAll('.amount-dr, .amount-cr')) {
				td.innerHTML = '';
				td.classList.remove('has-amount');
			}
			
			// Add correct input box
			let td = trPosting.querySelector(el.value === 'dr' ? '.amount-dr' : '.amount-cr');
			td.innerHTML = amountContent;
			td.classList.add('has-amount');
			td.querySelector('input').value = amountValue;
		}
		
		function addPosting(el) {
			let trPosting = el.parentNode.parentNode.parentNode;
			let sign = trPosting.querySelector('select').value; // Use same sign as row clicked
			
			let inputAmount = '<div class="input-group"><div class="input-group-text">$</div><input type="text" name="amount" class="form-control" oninput="changeAmount(this)"></div>';
			
			// Add new posting row
			let trNew = document.createElement('tr');
			trNew.innerHTML = '<tr><td></td><td></td><td><div class="input-group"><select class="form-select" name="sign" style="flex-grow:0;min-width:5em" onchange="changeDrCr(this)"><option value="dr"' + (sign === 'dr' ? ' selected' : '') + '>Dr</option><option value="cr"' + (sign === 'cr' ? ' selected' : '') + '>Cr</option></select><input type="text" name="account" class="form-control"><a class="btn btn-outline-primary" href="#" onclick="addPosting(this);return false;"><i class="bi bi-plus-circle-fill"></i></a></div></td>' + (sign === 'dr' ? ('<td class="amount-dr has-amount">' + inputAmount + '</td>') : '<td class="amount-dr"></td>') + (sign === 'cr' ? ('<td class="amount-cr has-amount">' + inputAmount + '</td>') : '<td class="amount-cr"></td>') + '</tr>';
			trPosting.after(trNew);
		}
		
		function changeAmount(el) {
			let amountInputs = document.querySelectorAll('input[name="amount"]');
			if (amountInputs.length === 2) {
				// Get other input
				let otherInput;
				for (inp of amountInputs) {
					if (inp !== el) {
						otherInput = inp;
						break;
					}
				}
				
				// Update other input with amount
				otherInput.value = el.value;
			}
		}
	</script>
{% endblock %}