/**
 * DimensionInspector.js
 * Modo C de comparación: inspector 2D de UNA dimensión a través de los chunks de
 * varios documentos. Elegimos un panel HTML/canvas (no líneas 3D) porque comparar
 * perfiles exactos (valores y cruces por cero) se lee mucho mejor en un plano 2D
 * con ejes y grilla que dentro de la escena 3D con cámara libre.
 *
 * Eje X = chunk_index (re-muestreado a una longitud común para alinear documentos
 * de distinto largo, coherente con STATE.reliefAlignMode). Eje Y = activación de la
 * dimensión fijada. Una serie coloreada por documento, con leyenda.
 */

import { STATE, visibleReliefDocs, removeReliefDoc, getMaxDimensions } from '../core/State.js';
import { dimensionSeries, resampleSeries } from './ReliefMath.js';

const PANEL_ID  = 'dimension-inspector';
const CANVAS_ID = 'dimension-inspector-canvas';

function _hexCss(hex) {
    return '#' + (hex & 0xffffff).toString(16).padStart(6, '0');
}

// Helpers for multi-dimension plotting
function _getSeriesColor(baseColorHex, dIdx, totalDims) {
    if (totalDims <= 1) return _hexCss(baseColorHex);
    // Convert hex integer to RGB
    const r = ((baseColorHex >> 16) & 0xff) / 255;
    const g = ((baseColorHex >> 8) & 0xff) / 255;
    const b = (baseColorHex & 0xff) / 255;

    // RGB to HSL
    const max = Math.max(r, g, b), min = Math.min(r, g, b);
    let h, s, l = (max + min) / 2;

    if (max === min) {
        h = s = 0; // achromatic
    } else {
        const d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        switch (max) {
            case r: h = (g - b) / d + (g < b ? 6 : 0); break;
            case g: h = (b - r) / d + 2; break;
            case b: h = (r - g) / d + 4; break;
        }
        h /= 6;
    }

    // Shift hue and lightness slightly for different dimensions of the same document
    h = (h + (dIdx / totalDims) * 0.18) % 1.0;
    l = Math.max(0.4, Math.min(0.75, l + (dIdx - (totalDims - 1) / 2) * 0.08));

    return `hsl(${Math.round(h * 360)}, ${Math.round(s * 100)}%, ${Math.round(l * 100)}%)`;
}

function _getLineDash(dIdx) {
    const dashes = [
        [],                 // solid
        [6, 4],             // dashed
        [2, 3],             // dotted
        [8, 4, 2, 4],       // dash-dotted
        [12, 6],            // long dashed
    ];
    return dashes[dIdx % dashes.length];
}

function _getLegendSvg(dIdx, color) {
    const dasharray = _getLineDash(dIdx).join(',');
    return `<svg width="18" height="6" style="vertical-align:middle;margin-right:4px;display:inline-block;flex-shrink:0;">
        <line x1="0" y1="3" x2="18" y2="3" stroke="${color}" stroke-width="2" ${dasharray ? `stroke-dasharray="${dasharray}"` : ''} />
    </svg>`;
}

// Crea el panel una sola vez y lo devuelve.
function _ensurePanel() {
    let panel = document.getElementById(PANEL_ID);
    if (panel) return panel;

    panel = document.createElement('div');
    panel.id = PANEL_ID;
    panel.className = 'fullscreen-inspector';
    panel.style.display = 'none';

    const header = document.createElement('div');
    header.className = 'inspector-header';

    const titleCol = document.createElement('div');
    titleCol.className = 'inspector-title-col';

    const title = document.createElement('span');
    title.id = PANEL_ID + '-title';
    title.className = 'inspector-title';
    title.textContent = 'Inspector de dimensión';
    titleCol.appendChild(title);
    header.appendChild(titleCol);

    const actions = document.createElement('div');
    actions.className = 'inspector-actions';

    const aiButton = document.createElement('button');
    aiButton.id = PANEL_ID + '-ai-btn';
    aiButton.className = 'btn btn-secondary';
    aiButton.style.cssText = 'font-size: 10px; min-height: 24px; padding: 2px 8px; display: flex; align-items: center; gap: 4px; cursor: pointer;';
    aiButton.innerHTML = '🤖 Nombrar (IA)';
    aiButton.onclick = (e) => {
        e.stopPropagation();
        const dim = STATE.reliefInspectDim | 0;
        document.dispatchEvent(new CustomEvent('open-naming-modal', { detail: { dimIndex: dim } }));
    };
    actions.appendChild(aiButton);

    const exportBtn = document.createElement('button');
    exportBtn.id = PANEL_ID + '-export-btn';
    exportBtn.className = 'btn btn-secondary';
    exportBtn.style.cssText = 'font-size: 10px; min-height: 24px; padding: 2px 8px; display: flex; align-items: center; gap: 4px; cursor: pointer;';
    exportBtn.innerHTML = '📋 Exportar para LLM';
    exportBtn.onclick = async (e) => {
        e.stopPropagation();
        const dim = STATE.reliefInspectDim | 0;
        const space = STATE.featureSpace || 'RAW';
        const originalLabel = exportBtn.innerHTML;
        try {
            exportBtn.disabled = true;
            exportBtn.innerHTML = '⏳ Copiando...';
            const markdownString = await exportDimensionContext(dim, space);
            await navigator.clipboard.writeText(markdownString);
            exportBtn.innerHTML = '¡Copiado!';
        } catch (err) {
            console.error("Error copying dimension context to clipboard:", err);
            exportBtn.innerHTML = '❌ Error';
        } finally {
            setTimeout(() => {
                exportBtn.disabled = false;
                exportBtn.innerHTML = originalLabel;
            }, 2000);
        }
    };
    actions.appendChild(exportBtn);

    const closeBtn = document.createElement('button');
    closeBtn.className = 'inspector-close-btn';
    closeBtn.innerHTML = '✕';
    closeBtn.onclick = (e) => {
        e.stopPropagation();
        const compModeSelect = document.getElementById('comparison-mode-selector');
        if (compModeSelect) {
            compModeSelect.value = 'A';
            compModeSelect.dispatchEvent(new Event('change'));
        } else {
            STATE.comparisonMode = 'A';
            if (typeof window.applyComparison === 'function') window.applyComparison();
        }
    };
    actions.appendChild(closeBtn);
    header.appendChild(actions);

    // Body container
    const body = document.createElement('div');
    body.id = PANEL_ID + '-body';
    body.className = 'inspector-body';

    // Left Column (Canvas)
    const leftCol = document.createElement('div');
    leftCol.className = 'inspector-left-col';

    const canvas = document.createElement('canvas');
    canvas.id = CANVAS_ID;
    canvas.style.cssText = 'flex:1; width:100%; height:100%; display:block;';
    leftCol.appendChild(canvas);

    // Right Column (Controls/Legend)
    const rightCol = document.createElement('div');
    rightCol.id = PANEL_ID + '-controls';
    rightCol.className = 'inspector-right-col';

    // Dimension Section
    const dimSec = document.createElement('div');
    dimSec.style.cssText = 'display:flex; flex-direction:column; gap:4px;';

    const dimHeader = document.createElement('div');
    dimHeader.style.cssText = 'font-weight:bold; font-size:10px; color:var(--color-brand-primary); letter-spacing:0.5px;';
    dimHeader.textContent = 'DIMENSIONES';
    dimSec.appendChild(dimHeader);

    const dimAddRow = document.createElement('div');
    dimAddRow.style.cssText = 'display:flex; align-items:center; gap:4px; margin-bottom:2px;';
    const maxInspectorDim = getMaxDimensions() - 1;
    dimAddRow.innerHTML = `
        <input type="number" id="inspector-dim-input" class="input-field" min="0" max="${maxInspectorDim}" value="${STATE.reliefInspectDim}" style="flex:1; font-size:10px; padding:2px; background:oklch(from var(--color-neutral-950) l c h / 0.5); text-align:center; height:22px; border-radius:3px; border:1px solid oklch(from var(--color-neutral-50) l c h / 0.15); color:var(--color-neutral-200);">
        <button id="inspector-dim-add-btn" class="btn btn-primary" style="font-size:10px; padding:2px 8px; min-height:22px; height:22px; cursor:pointer;">+ Add</button>
    `;
    dimSec.appendChild(dimAddRow);

    const dimSelectRow = document.createElement('div');
    dimSelectRow.style.cssText = 'display:flex; align-items:center; gap:4px; margin-bottom:2px;';
    dimSelectRow.innerHTML = `
        <select id="inspector-dim-select-dropdown" class="input-field" style="flex:1; font-size:9px; padding:2px; background:oklch(from var(--color-neutral-950) l c h / 0.5); height:22px; border-radius:3px; border:1px solid oklch(from var(--color-neutral-50) l c h / 0.15); color:var(--color-neutral-200); width:130px; overflow:hidden; text-overflow:ellipsis;"></select>
    `;
    dimSec.appendChild(dimSelectRow);

    const dimList = document.createElement('div');
    dimList.id = 'inspector-dim-list';
    dimList.style.cssText = 'display:flex; flex-direction:column; gap:3px; max-height:130px; overflow-y:auto; padding:3px; border:1px solid oklch(from var(--color-neutral-50) l c h / 0.06); border-radius:4px; background:oklch(from var(--color-neutral-950) l c h / 0.25);';
    dimSec.appendChild(dimList);

    // Document Section
    const docSec = document.createElement('div');
    docSec.style.cssText = 'display:flex; flex-direction:column; gap:4px; margin-top:2px;';

    const docHeader = document.createElement('div');
    docHeader.style.cssText = 'font-weight:bold; font-size:10px; color:var(--color-brand-secondary); letter-spacing:0.5px;';
    docHeader.textContent = 'DOCUMENTOS (PDF)';
    docSec.appendChild(docHeader);

    const docAddRow = document.createElement('div');
    docAddRow.style.cssText = 'display:flex; align-items:center; gap:4px; margin-bottom:2px;';
    docAddRow.innerHTML = `
        <select id="inspector-pdf-select" class="input-field" style="flex:1; font-size:9px; padding:2px; background:oklch(from var(--color-neutral-950) l c h / 0.5); height:22px; border-radius:3px; border:1px solid oklch(from var(--color-neutral-50) l c h / 0.15); color:var(--color-neutral-200); width:130px; overflow:hidden; text-overflow:ellipsis;"></select>
        <button id="inspector-pdf-add-btn" class="btn btn-secondary" style="font-size:10px; padding:2px 8px; min-height:22px; height:22px; cursor:pointer;">+ Add</button>
    `;
    docSec.appendChild(docAddRow);

    const docList = document.createElement('div');
    docList.id = 'inspector-doc-list';
    docList.style.cssText = 'display:flex; flex-direction:column; gap:3px; max-height:130px; overflow-y:auto; padding:3px; border:1px solid oklch(from var(--color-neutral-50) l c h / 0.06); border-radius:4px; background:oklch(from var(--color-neutral-950) l c h / 0.25);';
    docSec.appendChild(docList);

    rightCol.appendChild(dimSec);
    rightCol.appendChild(docSec);

    body.appendChild(leftCol);
    body.appendChild(rightCol);

    panel.appendChild(header);
    panel.appendChild(body);

    const host = document.getElementById('app') || document.body;
    host.appendChild(panel);

    // Bind add dimension button
    const dimInput = dimAddRow.querySelector('#inspector-dim-input');
    const dimAddBtn = dimAddRow.querySelector('#inspector-dim-add-btn');

    const triggerAddDim = () => {
        const val = parseInt(dimInput.value, 10);
        const maxDim = getMaxDimensions() - 1;
        if (!Number.isNaN(val) && val >= 0 && val <= maxDim) {
            STATE.reliefInspectDim = val;
            if (!STATE.reliefInspectDims) STATE.reliefInspectDims = [];
            if (!STATE.reliefInspectDims.some(d => d.dim === val)) {
                STATE.reliefInspectDims.push({ dim: val, visible: true });
            }
            // Sync to sidebar
            const sidebarInput = document.getElementById('inspect-dim-input');
            if (sidebarInput) sidebarInput.value = val;
            if (typeof window.sidebarRefreshDims === 'function') window.sidebarRefreshDims();

            renderDimensionInspector();
        }
    };
    dimAddBtn.onclick = triggerAddDim;
    dimInput.onkeydown = (e) => {
        if (e.key === 'Enter') {
            e.preventDefault();
            triggerAddDim();
        }
    };

    const dimSelectDropdown = dimSelectRow.querySelector('#inspector-dim-select-dropdown');
    if (dimSelectDropdown) {
        dimSelectDropdown.onchange = function() {
            const val = parseInt(this.value, 10);
            STATE.reliefInspectDim = val;
            if (!STATE.reliefInspectDims) STATE.reliefInspectDims = [];
            if (!STATE.reliefInspectDims.some(d => d.dim === val)) {
                STATE.reliefInspectDims.push({ dim: val, visible: true });
            }
            const sidebarInput = document.getElementById('inspect-dim-input');
            if (sidebarInput) sidebarInput.value = val;
            if (typeof window.sidebarRefreshDims === 'function') window.sidebarRefreshDims();

            renderDimensionInspector();
        };
    }

    // Bind add PDF button
    const pdfSelectEl = docAddRow.querySelector('#inspector-pdf-select');
    const pdfAddBtn = docAddRow.querySelector('#inspector-pdf-add-btn');
    pdfAddBtn.onclick = () => {
        const val = pdfSelectEl.value;
        if (val) {
            const sidebarSelect = document.getElementById('relief-file-selector');
            const sidebarBtn = document.getElementById('btn-relief-visualize');
            if (sidebarSelect && sidebarBtn) {
                sidebarSelect.value = val;
                sidebarBtn.click();
            }
        }
    };

    // Keep inspectorPdfSelect in sync with updates
    window.inspectorRefreshPdfSelect = () => {
        const sidebarSelect = document.getElementById('relief-file-selector');
        if (sidebarSelect && pdfSelectEl) {
            const currentSelVal = pdfSelectEl.value;
            pdfSelectEl.innerHTML = '';
            Array.from(sidebarSelect.options).forEach(opt => {
                if (opt.value) { // Skip empty placeholder
                    const newOpt = document.createElement('option');
                    newOpt.value = opt.value;
                    newOpt.textContent = opt.textContent;
                    pdfSelectEl.appendChild(newOpt);
                }
            });
            if (currentSelVal && Array.from(pdfSelectEl.options).some(o => o.value === currentSelVal)) {
                pdfSelectEl.value = currentSelVal;
            }
        }
    };

    if (typeof ResizeObserver !== 'undefined') {
        const resizeObserver = new ResizeObserver(() => {
            if (panel.style.display !== 'none' && panel.classList.contains('show')) {
                renderDimensionInspector();
            }
        });
        resizeObserver.observe(leftCol);
    }

    return panel;
}

export function hideDimensionInspector() {
    const panel = document.getElementById(PANEL_ID);
    if (panel) {
        panel.classList.remove('show');
        setTimeout(() => {
            if (!panel.classList.contains('show')) {
                panel.style.display = 'none';
            }
        }, 300);
    }
}

export function showDimensionInspector() {
    const panel = _ensurePanel();
    panel.style.display = 'flex';
    void panel.offsetWidth; // force layout recalculation
    panel.classList.add('show');
    if (typeof window.inspectorRefreshPdfSelect === 'function') {
        window.inspectorRefreshPdfSelect();
    }
    if (typeof window.refreshAllDimensionSelects === 'function') {
        window.refreshAllDimensionSelects();
    }
    renderDimensionInspector();
}

export async function exportDimensionContext(dimIndex, space) {
    const spaceKey = `${space.toLowerCase()}_${dimIndex}`;
    const dictEntry = STATE.dimensionDictionary ? STATE.dimensionDictionary[spaceKey] : null;
    const name = dictEntry ? dictEntry.name : (STATE.dimensionLabels[spaceKey] || 'Sin nombre');
    const rationale = dictEntry ? dictEntry.rationale : 'Sin justificación registrada.';

    const activeFilenames = STATE.reliefDocs.filter(d => d.visible).map(d => d.filename);

    let topPos = [];
    let topNeg = [];

    if (STATE.provider && STATE.provider.ready) {
        try {
            const response = await STATE.provider.getTopChunksForDimension(dimIndex, activeFilenames, space, 8);
            topPos = response.top_activators || [];
            topNeg = response.bottom_activators || [];
        } catch (err) {
            console.error("Error fetching top chunks for dimension:", err);
        }
    }

    const lines = [];
    lines.push(`# Dimensión #${dimIndex} (${space.toUpperCase()})`);
    lines.push(``);
    lines.push(`- **Nombre Semántico:** ${name}`);
    lines.push(`- **Justificación:** ${rationale}`);
    lines.push(``);
    lines.push(`## Top Activadores (+)`);
    if (topPos.length > 0) {
        topPos.forEach(c => {
            lines.push(`- **[Valor: ${c.value.toFixed(4)}]** ${c.text.trim()} *(Archivo: ${c.filename}, Chunk: ${c.chunk_index})*`);
        });
    } else {
        lines.push(`- No se encontraron activadores positivos.`);
    }
    lines.push(``);
    lines.push(`## Bottom Activadores (-)`);
    if (topNeg.length > 0) {
        topNeg.forEach(c => {
            lines.push(`- **[Valor: ${c.value.toFixed(4)}]** ${c.text.trim()} *(Archivo: ${c.filename}, Chunk: ${c.chunk_index})*`);
        });
    } else {
        lines.push(`- No se encontraron activadores negativos/inhibidores.`);
    }

    return lines.join('\n');
}

function _renderControls() {
    const dimList = document.getElementById('inspector-dim-list');
    const docList = document.getElementById('inspector-doc-list');

    if (!dimList || !docList) return;

    // 1. Render dimensions list
    dimList.innerHTML = '';
    const dims = STATE.reliefInspectDims || [];
    if (dims.length === 0) {
        dimList.innerHTML = '<span style="font-size:10px; color:var(--color-neutral-500); padding:6px; display:block; text-align:center;">Sin dims comparadas.</span>';
    } else {
        const prefix = (STATE.featureSpace || 'RAW').toLowerCase();
        dims.forEach((dObj, idx) => {
            const dim = dObj.dim;
            const savedName = STATE.dimensionLabels[`${prefix}_${dim}`];
            const label = savedName ? `#${dim} [${savedName}]` : `#${dim}`;

            const row = document.createElement('div');
            row.style.cssText = 'display:flex; align-items:center; justify-content:space-between; gap:4px; font-size:10px; padding:2px 4px; border-radius:2px; transition:background 0.15s; color:var(--color-neutral-300);';
            row.onmouseenter = () => row.style.background = 'oklch(from var(--color-neutral-50) l c h / 0.03)';
            row.onmouseleave = () => row.style.background = '';

            // Swatch for this dimension pattern
            const svgIcon = _getLegendSvg(idx, 'var(--color-neutral-400)');

            row.innerHTML = `
                <div style="display:flex; align-items:center; gap:2px; flex:1; min-width:0;">
                    ${svgIcon}
                    <span style="overflow:hidden; text-overflow:ellipsis; white-space:nowrap; color:${dObj.visible ? 'var(--color-neutral-200)' : 'var(--color-neutral-600)'};">${label}</span>
                </div>
                <button class="dim-vis-btn" title="Mostrar/ocultar" style="background:none;border:none;cursor:pointer;color:var(--color-neutral-400);font-size:12px;padding:0 2px;">${dObj.visible ? '👁' : '🚫'}</button>
                <button class="dim-del-btn" title="Quitar" style="background:none;border:none;cursor:pointer;color:var(--color-semantic-error);font-size:12px;padding:0 2px;">✕</button>
            `;

            row.querySelector('.dim-vis-btn').onclick = (e) => {
                e.stopPropagation();
                dObj.visible = !dObj.visible;
                if (typeof window.sidebarRefreshDims === 'function') window.sidebarRefreshDims();
                renderDimensionInspector();
            };

            row.querySelector('.dim-del-btn').onclick = (e) => {
                e.stopPropagation();
                STATE.reliefInspectDims.splice(idx, 1);
                if (typeof window.sidebarRefreshDims === 'function') window.sidebarRefreshDims();
                renderDimensionInspector();
            };

            dimList.appendChild(row);
        });
    }

    // 2. Render documents list
    docList.innerHTML = '';
    const docs = STATE.reliefDocs || [];
    if (docs.length === 0) {
        docList.innerHTML = '<span style="font-size:10px; color:var(--color-neutral-500); padding:6px; display:block; text-align:center;">Sin PDFs activos.</span>';
    } else {
        docs.forEach((doc) => {
            const colorCss = _hexCss(doc.color);
            const row = document.createElement('div');
            row.style.cssText = 'display:flex; align-items:center; justify-content:space-between; gap:4px; font-size:10px; padding:2px 4px; border-radius:2px; transition:background 0.15s; color:var(--color-neutral-300);';
            row.onmouseenter = () => row.style.background = 'oklch(from var(--color-neutral-50) l c h / 0.03)';
            row.onmouseleave = () => row.style.background = '';

            row.innerHTML = `
                <div style="display:flex; align-items:center; gap:4px; flex:1; min-width:0;">
                    <span style="width:8px;height:8px;border-radius:2px;background:${colorCss};flex-shrink:0;"></span>
                    <span title="${doc.filename}" style="overflow:hidden; text-overflow:ellipsis; white-space:nowrap; color:${doc.visible ? 'var(--color-neutral-200)' : 'var(--color-neutral-600)'};">${doc.label}</span>
                </div>
                <button class="doc-vis-btn" title="Mostrar/ocultar" style="background:none;border:none;cursor:pointer;color:var(--color-neutral-400);font-size:12px;padding:0 2px;">${doc.visible ? '👁' : '🚫'}</button>
                <button class="doc-del-btn" title="Quitar" style="background:none;border:none;cursor:pointer;color:var(--color-semantic-error);font-size:12px;padding:0 2px;">✕</button>
            `;

            row.querySelector('.doc-vis-btn').onclick = (e) => {
                e.stopPropagation();
                doc.visible = !doc.visible;
                if (typeof window.sidebarRefreshDocs === 'function') window.sidebarRefreshDocs();
                if (typeof window.applyComparison === 'function') window.applyComparison();
                renderDimensionInspector();
            };

            row.querySelector('.doc-del-btn').onclick = (e) => {
                e.stopPropagation();
                removeReliefDoc(doc.id);
                if (typeof window.sidebarRefreshDocs === 'function') window.sidebarRefreshDocs();
                if (typeof window.applyComparison === 'function') window.applyComparison();
                renderDimensionInspector();
            };

            docList.appendChild(row);
        });
    }
}

// Dibuja el gráfico. Idempotente: se puede llamar al cambiar la dimensión, los
// documentos visibles o su color.
export function renderDimensionInspector() {
    const panel = document.getElementById(PANEL_ID);
    if (!panel || panel.style.display === 'none') return;

    const docs = visibleReliefDocs();
    const visibleDims = (STATE.reliefInspectDims || []).filter(d => d.visible);

    const titleEl = document.getElementById(PANEL_ID + '-title');
    const prefix = (STATE.featureSpace || 'RAW').toLowerCase();

    if (titleEl) {
        if (visibleDims.length === 1) {
            const dim = visibleDims[0].dim;
            const savedName = STATE.dimensionLabels[`${prefix}_${dim}`];
            titleEl.textContent = `Dimensión #${dim}${savedName ? ` [${savedName}]` : ''} · ${docs.length} doc(s)`;
        } else if (visibleDims.length > 1) {
            titleEl.textContent = `Comparación · ${visibleDims.length} dimensiones · ${docs.length} doc(s)`;
        } else {
            titleEl.textContent = 'Comparación · Sin dimensiones activas';
        }
    }

    const canvas = document.getElementById(CANVAS_ID);
    if (!canvas) return;

    // Ajustar el buffer del canvas al tamaño en pantalla (nitidez en HiDPI).
    // El canvas recién mostrado puede medir 0 antes del primer paint; caemos al
    // ancho explícito del panel para dibujar siempre, sin depender de rAF.
    const rect = canvas.getBoundingClientRect();
    const cssW = rect.width  || canvas.clientWidth  || (panel.clientWidth  - 260) || 560;
    const cssH = rect.height || canvas.clientHeight || (panel.clientHeight - 48) || 350;
    const dpr = window.devicePixelRatio || 1;
    const W = Math.max(1, Math.floor(cssW * dpr));
    const H = Math.max(1, Math.floor(cssH * dpr));
    if (canvas.width !== W || canvas.height !== H) { canvas.width = W; canvas.height = H; }

    const ctx = canvas.getContext('2d');
    ctx.clearRect(0, 0, W, H);

    // padR = 100 * dpr to fit text labels at the end of curves
    const padL = 44 * dpr, padR = 105 * dpr, padT = 12 * dpr, padB = 22 * dpr;
    const plotW = W - padL - padR;
    const plotH = H - padT - padB;

    // Extraer series (perfil de las dimensiones por documento) y alinear su largo.
    const rawSeries = [];
    docs.forEach(doc => {
        visibleDims.forEach(dObj => {
            const dim = dObj.dim;
            const values = dimensionSeries(doc.matrix, dim);
            if (values.length > 0) {
                const savedName = STATE.dimensionLabels[`${prefix}_${dim}`];
                rawSeries.push({ doc, dim, savedName, values });
            }
        });
    });

    if (rawSeries.length === 0) {
        ctx.fillStyle = 'var(--color-neutral-400)';
        ctx.font = `${11 * dpr}px monospace`;
        ctx.fillText('Sin series para inspeccionar (seleccioná PDFs y agregá dimensiones).', padL, padT + plotH / 2);
        _renderControls();
        return;
    }

    const targetLen = STATE.reliefAlignMode === 'INDEX'
        ? Math.min(...rawSeries.map(s => s.values.length))
        : Math.max(...rawSeries.map(s => s.values.length));
    const series = rawSeries.map(s => ({
        doc: s.doc,
        dim: s.dim,
        savedName: s.savedName,
        values: resampleSeries(s.values, targetLen)
    }));

    // Rango Y simétrico alrededor de cero para que el signo se lee de inmediato.
    let absMax = 0;
    for (const s of series) for (const v of s.values) absMax = Math.max(absMax, Math.abs(v));
    if (absMax < 1e-9) absMax = 1;

    const xAt = (i) => padL + (targetLen <= 1 ? 0 : (i / (targetLen - 1)) * plotW);
    const yAt = (v) => padT + plotH / 2 - (v / absMax) * (plotH / 2);

    // Grilla + eje cero.
    ctx.strokeStyle = 'oklch(from var(--color-neutral-50) l c h / 0.08)';
    ctx.lineWidth = 1 * dpr;
    ctx.beginPath();
    for (let g = 0; g <= 4; g++) {
        const y = padT + (g / 4) * plotH;
        ctx.moveTo(padL, y); ctx.lineTo(padL + plotW, y);
    }
    ctx.stroke();
    ctx.strokeStyle = 'oklch(from var(--color-neutral-50) l c h / 0.25)';
    ctx.beginPath();
    ctx.moveTo(padL, yAt(0)); ctx.lineTo(padL + plotW, yAt(0));
    ctx.stroke();

    // Etiquetas de eje Y.
    ctx.fillStyle = 'var(--color-neutral-400)';
    ctx.font = `${9 * dpr}px monospace`;
    ctx.textAlign = 'right'; ctx.textBaseline = 'middle';
    ctx.fillText(`+${absMax.toFixed(3)}`, padL - 6 * dpr, padT);
    ctx.fillText('0', padL - 6 * dpr, yAt(0));
    ctx.fillText(`-${absMax.toFixed(3)}`, padL - 6 * dpr, padT + plotH);
    ctx.textAlign = 'center'; ctx.textBaseline = 'top';
    ctx.fillText('chunk →', padL + plotW / 2, padT + plotH + 6 * dpr);

    // Series.
    series.forEach(s => {
        const dIdx = visibleDims.findIndex(d => d.dim === s.dim);
        const color = _getSeriesColor(s.doc.color, dIdx, visibleDims.length);
        const dash = _getLineDash(dIdx);

        ctx.strokeStyle = color;
        ctx.lineWidth = 1.8 * dpr;
        ctx.setLineDash(dash.map(v => v * dpr));

        ctx.beginPath();
        s.values.forEach((v, i) => {
            const x = xAt(i), y = yAt(v);
            if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y);
        });
        ctx.stroke();
    });
    ctx.setLineDash([]);

    // Dibujar etiquetas al final de cada curva en el canvas (collision avoidance)
    ctx.font = `${9 * dpr}px monospace`;
    ctx.textAlign = 'left';
    ctx.textBaseline = 'middle';

    const labels = [];
    series.forEach(s => {
        const dIdx = visibleDims.findIndex(d => d.dim === s.dim);
        const color = _getSeriesColor(s.doc.color, dIdx, visibleDims.length);
        const yTarget = yAt(s.values[targetLen - 1]);
        const shortName = s.doc.baseLabel || s.doc.label || '';
        // Truncate document name to 10 chars
        const truncatedDocName = shortName.length > 10 ? shortName.substring(0, 10) + '…' : shortName;
        const labelText = visibleDims.length === 1
            ? truncatedDocName
            : (docs.length === 1 ? `Dim #${s.dim}` : `${truncatedDocName} · #${s.dim}`);

        labels.push({
            text: labelText,
            y: yTarget,
            color: color,
        });
    });

    // Sort by y coordinate ascending to declutter
    labels.sort((a, b) => a.y - b.y);

    // Ensure min distance of 11 * dpr
    const minSep = 11 * dpr;
    for (let j = 1; j < labels.length; j++) {
        if (labels[j].y - labels[j-1].y < minSep) {
            labels[j].y = labels[j-1].y + minSep;
        }
    }
    for (let j = labels.length - 2; j >= 0; j--) {
        if (labels[j+1].y - labels[j].y < minSep) {
            labels[j].y = labels[j+1].y - minSep;
        }
    }

    // Now draw each label
    labels.forEach(l => {
        ctx.fillStyle = l.color;
        ctx.fillText(l.text, padL + plotW + 6 * dpr, l.y);
    });

    _renderControls();
}