{% extends "base.html" %}

{# Page organiser for image instructions.
   Created by: Jess Rogerson (yelling commands at Claude.AI) #}

{% block title %}Organise Pages - {{ set.set_number }}: {{ set.set_name }}{% endblock %}

{% block content %}
<style>
    .organiser-toolbar {
        position: sticky;
        top: 0;
        z-index: 200;
        background-color: #1a1a1a;
        color: #fff;
        padding: 15px 20px;
        border-radius: 8px 8px 0 0;
    }

    .organiser-body {
        background-color: #f1f1f1;
        border-radius: 0 0 8px 8px;
        padding: 20px;
        min-height: 50vh;
    }

    .page-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(165px, 1fr));
        gap: 16px;
    }

    .page-tile {
        background: #fff;
        border: 2px solid #d7d7d7;
        border-radius: 6px;
        overflow: hidden;
        position: relative;
        cursor: grab;
    }

    .page-tile:focus-visible {
        outline: 3px solid #0d6efd;
        outline-offset: 2px;
    }

    .page-tile.dragging {
        opacity: .4;
    }

    .page-tile.drop-before {
        border-left-color: #0d6efd;
        box-shadow: inset 4px 0 0 #0d6efd;
    }

    .page-tile.drop-after {
        border-right-color: #0d6efd;
        box-shadow: inset -4px 0 0 #0d6efd;
    }

    .page-tile .thumb {
        width: 100%;
        aspect-ratio: 3 / 4;
        object-fit: contain;
        background: #fafafa;
        display: block;
    }

    .page-tile .tile-foot {
        padding: 6px 8px;
        border-top: 1px solid #eee;
    }

    .page-tile .file-name {
        font-size: .72rem;
        color: #666;
        word-break: break-all;
        line-height: 1.2;
        display: block;
    }

    .seq-badge {
        position: absolute;
        top: 6px;
        left: 6px;
        background: rgba(0, 0, 0, .78);
        color: #fff;
        border-radius: 14px;
        padding: 2px 11px;
        font-weight: 700;
        font-size: .82rem;
    }

    .hint-badge {
        position: absolute;
        top: 6px;
        right: 6px;
        background: rgba(255, 255, 255, .92);
        border: 1px solid #ccc;
        border-radius: 14px;
        padding: 1px 8px;
        font-size: .7rem;
        color: #555;
    }

    .tile-buttons {
        display: flex;
        gap: 4px;
        margin-top: 4px;
    }

    .tile-buttons .btn {
        padding: 1px 6px;
        font-size: .72rem;
        line-height: 1.4;
    }

    .jump-input {
        width: 100%;
        font-size: .75rem;
        padding: 1px 4px;
    }

    .save-bar {
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        background: #1a1a1a;
        color: #fff;
        padding: 12px 24px;
        border-radius: 40px;
        box-shadow: 0 4px 14px rgba(0, 0, 0, .45);
        z-index: 1000;
        display: none;
        align-items: center;
        gap: 14px;
    }

    .save-bar.visible {
        display: flex;
    }

    @media (prefers-reduced-motion: reduce) {
        .page-tile { transition: none; }
    }
</style>

<div class="organiser-toolbar">
    <div class="d-flex flex-wrap justify-content-between align-items-center gap-2">
        <div>
            <h5 class="mb-0">
                <i class="bi bi-arrows-move"></i> Organise pages
            </h5>
            <small class="text-muted">
                {{ set.set_number }}: {{ set.set_name }} &middot;
                <span id="pageCount">{{ pages|length }}</span> pages
            </small>
        </div>
        <div class="d-flex flex-wrap gap-2 align-items-center">
            <select class="form-select form-select-sm" id="sortStrategy" style="width: auto;">
                {% for value, label in strategies %}
                    <option value="{{ value }}">{{ label }}</option>
                {% endfor %}
            </select>
            <button class="btn btn-sm btn-warning" id="autoSortBtn">
                <i class="bi bi-sort-numeric-down"></i> Sort
            </button>
            <button class="btn btn-sm btn-outline-light" id="reverseBtn">
                <i class="bi bi-arrow-down-up"></i> Reverse
            </button>
            <button class="btn btn-sm btn-outline-light" id="renumberBtn">
                <i class="bi bi-123"></i> Renumber
            </button>
            <a href="{{ url_for('instructions.image_viewer', set_id=set.id) }}"
               class="btn btn-sm btn-outline-light">
                <i class="bi bi-book"></i> Preview
            </a>
            <a href="{{ url_for('sets.view_set', set_id=set.id) }}"
               class="btn btn-sm btn-outline-light">
                <i class="bi bi-x-lg"></i> Close
            </a>
        </div>
    </div>
</div>

<div class="organiser-body">
    {% if not audit.is_clean %}
        <div class="alert alert-warning py-2">
            <i class="bi bi-exclamation-triangle"></i>
            Numbering needs a tidy-up:
            {% if audit.duplicates %}
                duplicates at {{ audit.duplicates|join(', ') }}.
            {% endif %}
            {% if audit.gaps %}
                missing {{ audit.gaps|join(', ') }}.
            {% endif %}
            {% if audit.unnumbered %}
                {{ audit.unnumbered }} with no number.
            {% endif %}
            Renumber fixes all of it without moving anything.
        </div>
    {% endif %}

    <p class="text-muted small">
        Drag a page onto another to drop it there, or type a position in the box
        under any page and press Enter. Keyboard: tab to a page, then use the
        arrow buttons. Nothing is written until you save.
    </p>

    <div class="page-grid" id="pageGrid">
        {% for page in pages %}
            <div class="page-tile" draggable="true" tabindex="0"
                 data-id="{{ page.id }}"
                 data-name="{{ page.file_name }}">
                <span class="seq-badge">{{ loop.index }}</span>
                {% if page_hints.get(page.id) %}
                    <span class="hint-badge" title="Number found in the filename">
                        #{{ page_hints[page.id] }}
                    </span>
                {% endif %}
                <img class="thumb" loading="lazy"
                     alt="Page {{ loop.index }}"
                     src="/static/uploads/{{ (page.thumbnail_path or page.file_path).replace('\\', '/') }}">
                <div class="tile-foot">
                    <span class="file-name" title="{{ page.file_name }}">{{ page.file_name }}</span>
                    <div class="tile-buttons">
                        <button type="button" class="btn btn-outline-secondary move-left"
                                title="Move earlier">&larr;</button>
                        <button type="button" class="btn btn-outline-secondary move-right"
                                title="Move later">&rarr;</button>
                        <input type="number" min="1" class="jump-input" draggable="false"
                               placeholder="#" aria-label="Move to position">
                    </div>
                </div>
            </div>
        {% endfor %}
    </div>
</div>

<div class="save-bar" id="saveBar">
    <span id="saveStatus">Order changed</span>
    <button class="btn btn-success btn-sm" id="saveBtn">
        <i class="bi bi-check-lg"></i> Save order
    </button>
    <button class="btn btn-outline-light btn-sm" id="revertBtn">
        Discard changes
    </button>
</div>
{% endblock %}

{% block extra_js %}
<script>
(function () {
    const grid = document.getElementById('pageGrid');
    const saveBar = document.getElementById('saveBar');
    const saveStatus = document.getElementById('saveStatus');
    let leavingOnPurpose = false;

    const urls = {
        reorder: "{{ url_for('instructions.reorder', set_id=set.id) }}",
        autoSort: "{{ url_for('instructions.auto_sort', set_id=set.id) }}",
        renumber: "{{ url_for('instructions.renumber', set_id=set.id) }}"
    };

    const savedOrder = tiles().map(t => t.dataset.id);
    let dragged = null;

    function tiles() {
        return Array.from(grid.querySelectorAll('.page-tile'));
    }

    function currentOrder() {
        return tiles().map(t => t.dataset.id);
    }

    function isDirty() {
        const now = currentOrder();
        return now.length !== savedOrder.length ||
               now.some((id, i) => id !== savedOrder[i]);
    }

    function refresh() {
        tiles().forEach((tile, index) => {
            tile.querySelector('.seq-badge').textContent = index + 1;
            tile.querySelector('.thumb').alt = 'Page ' + (index + 1);
        });
        saveBar.classList.toggle('visible', isDirty());
        saveStatus.textContent = 'Order changed';
    }

    function moveTile(tile, newIndex) {
        const all = tiles();
        const clamped = Math.max(0, Math.min(newIndex, all.length - 1));
        const reference = all.filter(t => t !== tile)[clamped];
        if (reference) {
            grid.insertBefore(tile, reference);
        } else {
            grid.appendChild(tile);
        }
        refresh();
    }

    // A draggable parent stops some browsers letting you click into the
    // position box, so the tile stops being draggable while it has focus.
    grid.addEventListener('focusin', function (e) {
        if (e.target.classList.contains('jump-input')) {
            e.target.closest('.page-tile').draggable = false;
        }
    });

    grid.addEventListener('focusout', function (e) {
        if (e.target.classList.contains('jump-input')) {
            e.target.closest('.page-tile').draggable = true;
        }
    });

    // --- drag and drop (desktop) -------------------------------------------

    grid.addEventListener('dragstart', function (e) {
        const tile = e.target.closest('.page-tile');
        if (!tile) return;
        dragged = tile;
        tile.classList.add('dragging');
        e.dataTransfer.effectAllowed = 'move';
        e.dataTransfer.setData('text/plain', tile.dataset.id);
    });

    grid.addEventListener('dragend', function () {
        if (dragged) dragged.classList.remove('dragging');
        tiles().forEach(t => t.classList.remove('drop-before', 'drop-after'));
        dragged = null;
    });

    grid.addEventListener('dragover', function (e) {
        const tile = e.target.closest('.page-tile');
        if (!tile || !dragged || tile === dragged) return;
        e.preventDefault();
        e.dataTransfer.dropEffect = 'move';

        const box = tile.getBoundingClientRect();
        const before = (e.clientX - box.left) < box.width / 2;
        tiles().forEach(t => t.classList.remove('drop-before', 'drop-after'));
        tile.classList.add(before ? 'drop-before' : 'drop-after');
    });

    grid.addEventListener('drop', function (e) {
        const tile = e.target.closest('.page-tile');
        if (!tile || !dragged || tile === dragged) return;
        e.preventDefault();

        const box = tile.getBoundingClientRect();
        const before = (e.clientX - box.left) < box.width / 2;
        grid.insertBefore(dragged, before ? tile : tile.nextSibling);

        tiles().forEach(t => t.classList.remove('drop-before', 'drop-after'));
        refresh();
    });

    // --- buttons and the position box (touch and keyboard) -----------------

    grid.addEventListener('click', function (e) {
        const tile = e.target.closest('.page-tile');
        if (!tile) return;
        const index = tiles().indexOf(tile);

        if (e.target.closest('.move-left')) {
            moveTile(tile, index - 1);
            tile.focus();
        } else if (e.target.closest('.move-right')) {
            moveTile(tile, index + 1);
            tile.focus();
        }
    });

    grid.addEventListener('keydown', function (e) {
        if (e.target.classList.contains('jump-input')) {
            if (e.key !== 'Enter') return;
            e.preventDefault();
            const tile = e.target.closest('.page-tile');
            const wanted = parseInt(e.target.value, 10);
            if (!isNaN(wanted)) {
                moveTile(tile, wanted - 1);
                e.target.value = '';
                tile.focus();
            }
            return;
        }

        const tile = e.target.closest('.page-tile');
        if (!tile) return;
        const index = tiles().indexOf(tile);

        if (e.key === 'ArrowLeft' && e.shiftKey) {
            e.preventDefault();
            moveTile(tile, index - 1);
            tile.focus();
        } else if (e.key === 'ArrowRight' && e.shiftKey) {
            e.preventDefault();
            moveTile(tile, index + 1);
            tile.focus();
        }
    });

    // --- server calls ------------------------------------------------------

    function post(url, body, button) {
        if (button) button.disabled = true;
        return fetch(url, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(body || {})
        }).then(function (response) {
            return response.json().then(function (data) {
                if (!response.ok) throw new Error(data.error || 'Request failed');
                return data;
            });
        }).catch(function (error) {
            alert(error.message);
            throw error;
        }).finally(function () {
            if (button) button.disabled = false;
        });
    }

    document.getElementById('saveBtn').addEventListener('click', function () {
        const button = this;
        saveStatus.textContent = 'Saving...';
        post(urls.reorder, { order: currentOrder() }, button).then(function () {
            savedOrder.length = 0;
            currentOrder().forEach(id => savedOrder.push(id));
            saveStatus.textContent = 'Saved';
            saveBar.classList.remove('visible');
        }).catch(function () {
            saveStatus.textContent = 'Not saved';
        });
    });

    document.getElementById('revertBtn').addEventListener('click', function () {
        leavingOnPurpose = true;
        window.location.reload();
    });

    document.getElementById('autoSortBtn').addEventListener('click', function () {
        const strategy = document.getElementById('sortStrategy').value;
        post(urls.autoSort, { strategy: strategy }, this)
            .then(function () { leavingOnPurpose = true; window.location.reload(); });
    });

    document.getElementById('reverseBtn').addEventListener('click', function () {
        post(urls.autoSort, { strategy: 'reverse' }, this)
            .then(function () { leavingOnPurpose = true; window.location.reload(); });
    });

    document.getElementById('renumberBtn').addEventListener('click', function () {
        post(urls.renumber, {}, this)
            .then(function () { leavingOnPurpose = true; window.location.reload(); });
    });

    window.addEventListener('beforeunload', function (e) {
        if (isDirty() && !leavingOnPurpose) {
            e.preventDefault();
            e.returnValue = '';
        }
    });
})();
</script>
{% endblock %}