// Mapa: propiedad de CONFIG -> nombre de variable CSS
const CSS_VARS = {
  greenNodesColor:     "--ide-primary",
  greenStrokeColor:    "--ide-primary-light",
  linkLineColor:       "--canvas-link-line-color",
  linkGreenColor:      "--canvas-link-green-color",
  linkActiveColor:     "--canvas-link-active-color",
  purpleCoreLineColor: "--canvas-purple-core-line-color"
};

// Mapa: id de nodo violeta -> variable CSS
const PURPLE_NODE_VARS = {
  p_top:    "--canvas-purple-p-top-color",
  p_bottom: "--canvas-purple-p-bottom-color",
  p_left:   "--canvas-purple-p-left-color",
  p_right:  "--canvas-purple-p-right-color"
};

// Variable CSS común para todos los amarillos
const YELLOW_NODE_VAR = "--canvas-yellow-node-color";

/* ==========================================================================
   UTILIDAD: LEER VARIABLES CSS
   ========================================================================== */

function readCSSVariable(variableName, fallback = "") {
  const value = getComputedStyle(document.documentElement)
    .getPropertyValue(variableName)
    .trim();
  return value || fallback;
}

/* ==========================================================================
   CONFIGURACIÓN GENERAL
   ========================================================================== */

const CONFIG = {
  // 1. Color global configurable para TODOS los nodos verdes
  greenNodesColor:   readCSSVariable(CSS_VARS.greenNodesColor,   "#9b1717"),
  greenStrokeColor:  readCSSVariable(CSS_VARS.greenStrokeColor,  "#630b5f"),

  // 2. Estilos de líneas punteadas y dinámicas
  linkLineColor:       readCSSVariable(CSS_VARS.linkLineColor,       "rgba(95, 110, 240, 0.40)"),
  linkGreenColor:      readCSSVariable(CSS_VARS.linkGreenColor,      "rgba(235, 60, 60, 0.42)"),
  linkActiveColor:     readCSSVariable(CSS_VARS.linkActiveColor,     "rgba(25, 35, 205, 0.95)"),
  purpleCoreLineColor: readCSSVariable(CSS_VARS.purpleCoreLineColor, "rgba(35, 35, 35, 0.70)"),

  // 3. Nodos VIOLETAS centrales (posiciones, color individual, leyenda)
  purpleNodes: [
    {
      id: "p_top",
      x: 615, y: 185,
      radius: 42,
      label: "Núcleo N",
      color: readCSSVariable(PURPLE_NODE_VARS.p_top, "#8a00c2"),
      desc: "Servidor central de control y despacho de tareas."
    },
    {
      id: "p_bottom",
      x: 615, y: 335,
      radius: 42,
      label: "Núcleo S",
      color: readCSSVariable(PURPLE_NODE_VARS.p_bottom, "#9900d8"),
      desc: "Base de datos y redundancia estructural sur."
    },
    {
      id: "p_left",
      x: 485, y: 260,
      radius: 42,
      label: "Núcleo O",
      color: readCSSVariable(PURPLE_NODE_VARS.p_left, "#7e00b3"),
      desc: "Pasarela occidental hacia submódulos de entrada."
    },
    {
      id: "p_right",
      x: 745, y: 260,
      radius: 42,
      label: "Núcleo E",
      color: readCSSVariable(PURPLE_NODE_VARS.p_right, "#9400cf"),
      desc: "Concentrador oriental hacia subredes de distribución."
    }
  ],

  // 4. Nodos AMARILLOS: Cada uno conectado a 2 VIOLETAS
  yellowNodes: [
    // --- Lado Izquierdo ---
    { id: "yl_1", x: 420, y: 130, r: 26, label: "IZQ-1", color: readCSSVariable(YELLOW_NODE_VAR, "#ffff00"), desc: "Módulo intermedio A-1", purpleTargets: ["p_top", "p_left"],     side: "left" },
    { id: "yl_2", x: 350, y: 165, r: 24, label: "IZQ-2", color: readCSSVariable(YELLOW_NODE_VAR, "#fff01f"), desc: "Módulo intermedio A-2", purpleTargets: ["p_top", "p_left"],     side: "left" },
    { id: "yl_3", x: 355, y: 245, r: 25, label: "IZQ-3", color: readCSSVariable(YELLOW_NODE_VAR, "#ffee00"), desc: "Balanceador izquierdo", purpleTargets: ["p_left", "p_top"],    side: "left" },
    { id: "yl_4", x: 335, y: 335, r: 26, label: "IZQ-4", color: readCSSVariable(YELLOW_NODE_VAR, "#ffff00"), desc: "Filtro de tráfico A-4", purpleTargets: ["p_left", "p_bottom"], side: "left" },
    { id: "yl_5", x: 395, y: 415, r: 28, label: "IZQ-5", color: readCSSVariable(YELLOW_NODE_VAR, "#fff33b"), desc: "Procesador de paquetes", purpleTargets: ["p_bottom", "p_left"], side: "left" },
    { id: "yl_6", x: 255, y: 350, r: 25, label: "IZQ-6", color: readCSSVariable(YELLOW_NODE_VAR, "#ffee00"), desc: "Enrutador secundario", purpleTargets: ["p_left", "p_bottom"], side: "left" },

    // --- Lado Derecho ---
    { id: "yr_1", x: 800, y: 135, r: 25, label: "DER-1", color: readCSSVariable(YELLOW_NODE_VAR, "#ffff00"), desc: "Concentrador de salida 1", purpleTargets: ["p_top", "p_right"],    side: "right" },
    { id: "yr_2", x: 875, y: 155, r: 25, label: "DER-2", color: readCSSVariable(YELLOW_NODE_VAR, "#ffee00"), desc: "Concentrador de salida 2", purpleTargets: ["p_top", "p_right"],    side: "right" },
    { id: "yr_3", x: 950, y: 195, r: 25, label: "DER-3", color: readCSSVariable(YELLOW_NODE_VAR, "#ffff00"), desc: "Distribuidor rápido 3",    purpleTargets: ["p_right", "p_top"],    side: "right" },
    { id: "yr_4", x: 875, y: 235, r: 25, label: "DER-4", color: readCSSVariable(YELLOW_NODE_VAR, "#fff33b"), desc: "Replicador este 4",        purpleTargets: ["p_right", "p_top"],    side: "right" },
    { id: "yr_5", x: 890, y: 300, r: 25, label: "DER-5", color: readCSSVariable(YELLOW_NODE_VAR, "#ffee00"), desc: "Gestor de colas 5",        purpleTargets: ["p_right", "p_bottom"], side: "right" },
    { id: "yr_6", x: 965, y: 345, r: 25, label: "DER-6", color: readCSSVariable(YELLOW_NODE_VAR, "#ffff00"), desc: "Canal asíncrono 6",        purpleTargets: ["p_right", "p_bottom"], side: "right" },
    { id: "yr_7", x: 890, y: 375, r: 25, label: "DER-7", color: readCSSVariable(YELLOW_NODE_VAR, "#fff01f"), desc: "Salida perimetral 7",      purpleTargets: ["p_bottom", "p_right"], side: "right" },
    { id: "yr_8", x: 830, y: 420, r: 26, label: "DER-8", color: readCSSVariable(YELLOW_NODE_VAR, "#ffee00"), desc: "Canal de descarga 8",      purpleTargets: ["p_bottom", "p_right"], side: "right" }
  ]
};

/* ==========================================================================
   MOTOR INTERACTIVO Y RENDERIZADO
   ========================================================================== */

const canvas = document.getElementById("networkCanvas");
const ctx = canvas.getContext("2d");
const tooltip = document.getElementById("tooltip");
const tooltipTitle = document.getElementById("tooltip-title");
const tooltipDesc = document.getElementById("tooltip-desc");

let nodes = [];
let links = [];
let hoveredNode = null;
let dashOffset = 0;

// Construcción de la estructura
function initNetwork() {
  nodes = [];
  links = [];
  const linkSet = new Set(); // Previene enlaces duplicados entre mismos nodos

  function addLink(fromId, toId, type, curved = false, curvature = 0) {
    const keyA = `${fromId}->${toId}`;
    const keyB = `${toId}->${fromId}`;
    if (linkSet.has(keyA) || linkSet.has(keyB)) return;
    linkSet.add(keyA);
    links.push({ from: fromId, to: toId, type, curved, curvature });
  }

  // 1. Agregar Nodos Violetas
  CONFIG.purpleNodes.forEach(p => {
    nodes.push({
      ...p,
      type: "purple",
      baseX: p.x,
      baseY: p.y,
      speedOffset: Math.random() * 10
    });
  });

  // Conectar los violetas entre sí (malla central)
  const purples = nodes.filter(n => n.type === "purple");
  for (let i = 0; i < purples.length; i++) {
    for (let j = i + 1; j < purples.length; j++) {
      addLink(purples[i].id, purples[j].id, "purple-purple", false);
    }
  }

  // 2. Agregar Nodos Amarillos y crear DOBLE conexión curva hacia los violetas
  CONFIG.yellowNodes.forEach((y) => {
    nodes.push({
      id: y.id,
      x: y.x,
      y: y.y,
      baseX: y.x,
      baseY: y.y,
      radius: y.r,
      label: y.label,
      color: y.color,
      desc: y.desc,
      side: y.side,
      type: "yellow",
      speedOffset: Math.random() * 10
    });

    if (Array.isArray(y.purpleTargets)) {
      y.purpleTargets.forEach((targetPurpleId, index) => {
        addLink(
          targetPurpleId,
          y.id,
          "purple-yellow",
          true,
          index === 0 ? 0.16 : -0.16
        );
      });
    }
  });

  // 3. Crear Nodos Verdes Terciarios
  const greenPositions = [
    // Lado Izquierdo
    { id: "gl_1", x: 190, y: 95, side: "left" },
    { id: "gl_2", x: 260, y: 120, side: "left" },
    { id: "gl_3", x: 140, y: 155, side: "left" },
    { id: "gl_4", x: 75, y: 150, side: "left" },
    { id: "gl_5", x: 130, y: 225, side: "left" },
    { id: "gl_6", x: 65, y: 230, side: "left" },
    { id: "gl_7", x: 195, y: 235, side: "left" },
    { id: "gl_8", x: 60, y: 290, side: "left" },
    { id: "gl_9", x: 165, y: 305, side: "left" },
    { id: "gl_10", x: 75, y: 375, side: "left" },
    { id: "gl_11", x: 140, y: 380, side: "left" },
    { id: "gl_12", x: 145, y: 440, side: "left" },
    { id: "gl_13", x: 235, y: 425, side: "left" },

    // Lado Derecho
    { id: "gr_1", x: 1040, y: 90, side: "right" },
    { id: "gr_2", x: 960, y: 110, side: "right" },
    { id: "gr_3", x: 1025, y: 150, side: "right" },
    { id: "gr_4", x: 1095, y: 155, side: "right" },
    { id: "gr_5", x: 1160, y: 150, side: "right" },
    { id: "gr_6", x: 1030, y: 220, side: "right" },
    { id: "gr_7", x: 1105, y: 215, side: "right" },
    { id: "gr_8", x: 1170, y: 225, side: "right" },
    { id: "gr_9", x: 1060, y: 285, side: "right" },
    { id: "gr_10", x: 1120, y: 305, side: "right" },
    { id: "gr_11", x: 1175, y: 290, side: "right" },
    { id: "gr_12", x: 1025, y: 335, side: "right" },
    { id: "gr_13", x: 1095, y: 350, side: "right" },
    { id: "gr_14", x: 1035, y: 400, side: "right" },
    { id: "gr_15", x: 1085, y: 435, side: "right" },
    { id: "gr_16", x: 1165, y: 385, side: "right" },
    { id: "gr_17", x: 970, y: 425, side: "right" }
  ];

  greenPositions.forEach(g => {
    nodes.push({
      id: g.id,
      x: g.x,
      y: g.y,
      baseX: g.x,
      baseY: g.y,
      radius: 14,
      type: "green",
      side: g.side,
      speedOffset: Math.random() * 10
    });
  });

  // 4. CONEXIÓN AMARILLOS <-> VERDES (cobertura total en ambas direcciones)
  const yellows = nodes.filter(n => n.type === "yellow");
  const greens = nodes.filter(n => n.type === "green");

  // PASO A: cada amarillo con al menos 1 verde
  yellows.forEach((yNode, idx) => {
    const candidateGreens = greens.filter(g => g.side === yNode.side);
    candidateGreens.sort((a, b) => {
      const distA = Math.hypot(a.baseX - yNode.baseX, a.baseY - yNode.baseY);
      const distB = Math.hypot(b.baseX - yNode.baseX, b.baseY - yNode.baseY);
      return distA - distB;
    });

    if (candidateGreens.length > 0) {
      addLink(
        yNode.id,
        candidateGreens[0].id,
        "yellow-green",
        true,
        idx % 2 === 0 ? 0.20 : -0.20
      );
    }
  });

  // PASO B: cada verde con al menos 1 amarillo
  greens.forEach((gNode, idx) => {
    const alreadyConnected = links.some(
      l => l.type === "yellow-green" && (l.from === gNode.id || l.to === gNode.id)
    );

    const candidateYellows = yellows.filter(y => y.side === gNode.side);
    candidateYellows.sort((a, b) => {
      const distA = Math.hypot(a.baseX - gNode.baseX, a.baseY - gNode.baseY);
      const distB = Math.hypot(b.baseX - gNode.baseX, b.baseY - gNode.baseY);
      return distA - distB;
    });

    if (!alreadyConnected && candidateYellows.length > 0) {
      addLink(
        candidateYellows[0].id,
        gNode.id,
        "yellow-green",
        true,
        idx % 2 === 0 ? -0.22 : 0.22
      );
    } else if (candidateYellows.length > 1 && idx % 3 === 0) {
      addLink(
        candidateYellows[1].id,
        gNode.id,
        "yellow-green",
        true,
        idx % 2 === 0 ? 0.26 : -0.26
      );
    }
  });
}

// Bucle de actualización (flotación en zona segura)
function update(time) {
  const maxOffset = 4.5;

  nodes.forEach(node => {
    if (hoveredNode && hoveredNode.id === node.id) {
      node.x = node.baseX;
      node.y = node.baseY;
      return;
    }

    const t = (time * 0.0016) + node.speedOffset;
    node.x = node.baseX + Math.sin(t) * maxOffset;
    node.y = node.baseY + Math.cos(t * 0.85) * (maxOffset * 0.75);
  });

  dashOffset -= 0.35;
}

// Renderizado de líneas curvadas
function drawConnection(source, target, link, isHighlight) {
  ctx.save();
  ctx.beginPath();
  ctx.moveTo(source.x, source.y);

  if (link.curved) {
    const midX = (source.x + target.x) / 2;
    const midY = (source.y + target.y) / 2;
    const dx = target.x - source.x;
    const dy = target.y - source.y;
    const dist = Math.hypot(dx, dy);

    const nx = -dy / dist;
    const ny = dx / dist;

    const arcHeight = dist * link.curvature;
    const cpX = midX + nx * arcHeight;
    const cpY = midY + ny * arcHeight;

    ctx.quadraticCurveTo(cpX, cpY, target.x, target.y);
  } else {
    ctx.lineTo(target.x, target.y);
  }

  if (link.type === "purple-purple") {
    ctx.setLineDash([4, 4]);
    ctx.lineDashOffset = dashOffset * 0.5;
    ctx.strokeStyle = isHighlight ? "#000000" : CONFIG.purpleCoreLineColor;
    ctx.lineWidth = isHighlight ? 2.6 : 1.8;
  } else if (link.type === "yellow-green") {
    ctx.setLineDash([3, 4]);
    ctx.lineDashOffset = dashOffset;
    ctx.strokeStyle = isHighlight ? CONFIG.linkActiveColor : CONFIG.linkGreenColor;
    ctx.lineWidth = isHighlight ? 2.0 : 0.95;
  } else {
    ctx.setLineDash([3, 4]);
    ctx.lineDashOffset = dashOffset;
    ctx.strokeStyle = isHighlight ? CONFIG.linkActiveColor : CONFIG.linkLineColor;
    ctx.lineWidth = isHighlight ? 2.0 : 1.05;
  }

  ctx.stroke();
  ctx.restore();
}

// Renderizado del Canvas
function draw() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  const nodeMap = new Map(nodes.map(n => [n.id, n]));

  // 1. Dibujar líneas
  links.forEach(link => {
    const s = nodeMap.get(link.from);
    const t = nodeMap.get(link.to);
    if (!s || !t) return;

    const isHighlight = hoveredNode && (hoveredNode.id === s.id || hoveredNode.id === t.id);
    drawConnection(s, t, link, isHighlight);
  });

  // 2. Dibujar nodos
  nodes.forEach(node => {
    ctx.save();
    ctx.beginPath();
    ctx.arc(node.x, node.y, node.radius, 0, Math.PI * 2);

    if (node.type === "purple") {
      ctx.fillStyle = node.color;
      ctx.strokeStyle = "#210036";
      ctx.lineWidth = 1.8;
    } else if (node.type === "yellow") {
      ctx.fillStyle = node.color;
      ctx.strokeStyle = "#383500";
      ctx.lineWidth = 1.3;
    } else {
      ctx.fillStyle = CONFIG.greenNodesColor;
      ctx.strokeStyle = CONFIG.greenStrokeColor;
      ctx.lineWidth = 1.1;
    }

    if (hoveredNode && hoveredNode.id === node.id) {
      ctx.shadowColor = "rgba(0, 0, 0, 0.35)";
      ctx.shadowBlur = 14;
    }

    ctx.fill();
    ctx.stroke();
    ctx.restore();

    // 3. Texto en nodos violetas y amarillos
    if (node.label) {
      ctx.save();
      ctx.textAlign = "center";
      ctx.textBaseline = "middle";

      if (node.type === "purple") {
        ctx.fillStyle = "#ffffff";
        ctx.font = "bold 12.5px system-ui, sans-serif";
      } else if (node.type === "yellow") {
        ctx.fillStyle = "#1e1e1e";
        ctx.font = "600 10.5px system-ui, sans-serif";
      }

      ctx.fillText(node.label, node.x, node.y);
      ctx.restore();
    }
  });
}

// Loop 60 FPS
function animate(time) {
  update(time);
  draw();
  requestAnimationFrame(animate);
}

// Coordenadas con soporte responsivo
function getCanvasCoordinates(e) {
  const rect = canvas.getBoundingClientRect();
  const scaleX = canvas.width / rect.width;
  const scaleY = canvas.height / rect.height;

  return {
    x: (e.clientX - rect.left) * scaleX,
    y: (e.clientY - rect.top) * scaleY,
    cssX: e.clientX - rect.left,
    cssY: e.clientY - rect.top
  };
}

// Eventos de Mouse
canvas.addEventListener("mousemove", (e) => {
  const { x, y, cssX, cssY } = getCanvasCoordinates(e);

  const targets = nodes.filter(n => n.type === "purple" || n.type === "yellow");
  let found = null;

  for (let node of targets) {
    if (Math.hypot(node.x - x, node.y - y) <= node.radius) {
      found = node;
      break;
    }
  }

  hoveredNode = found;

  if (hoveredNode) {
    canvas.style.cursor = "pointer";
    tooltipTitle.textContent = hoveredNode.label;
    tooltipDesc.textContent = hoveredNode.desc;

    tooltip.style.left = `${cssX}px`;
    tooltip.style.top = `${cssY - (hoveredNode.radius * (canvas.getBoundingClientRect().height / canvas.height))}px`;
    tooltip.classList.remove("hidden");
  } else {
    canvas.style.cursor = "default";
    tooltip.classList.add("hidden");
  }
});

canvas.addEventListener("mouseleave", () => {
  hoveredNode = null;
  tooltip.classList.add("hidden");
});

/* ==========================================================================
   SOPORTE DE TEMA CLARO / OSCURO
   --------------------------------------------------------------------------
   - Re-lee las variables CSS y actualiza CONFIG + nodos vivos.
   - Observa cambios de `data-theme` o `class` en <html> y <body>.
   ========================================================================== */

function refreshColorsFromCSS() {
  // 1. Colores globales
  CONFIG.greenNodesColor   = readCSSVariable(CSS_VARS.greenNodesColor,   CONFIG.greenNodesColor);
  CONFIG.greenStrokeColor  = readCSSVariable(CSS_VARS.greenStrokeColor,  CONFIG.greenStrokeColor);
  CONFIG.linkLineColor     = readCSSVariable(CSS_VARS.linkLineColor,     CONFIG.linkLineColor);
  CONFIG.linkGreenColor    = readCSSVariable(CSS_VARS.linkGreenColor,    CONFIG.linkGreenColor);
  CONFIG.linkActiveColor   = readCSSVariable(CSS_VARS.linkActiveColor,   CONFIG.linkActiveColor);
  CONFIG.purpleCoreLineColor = readCSSVariable(CSS_VARS.purpleCoreLineColor, CONFIG.purpleCoreLineColor);

  // 2. Colores de violetas en CONFIG
  CONFIG.purpleNodes.forEach(p => {
    const cssVar = PURPLE_NODE_VARS[p.id];
    if (cssVar) p.color = readCSSVariable(cssVar, p.color);
  });

  // 3. Colores de amarillos en CONFIG
  CONFIG.yellowNodes.forEach(y => {
    y.color = readCSSVariable(YELLOW_NODE_VAR, y.color);
  });

  // 4. Propagar a los nodos ya instanciados
  nodes.forEach(node => {
    if (node.type === "purple" && PURPLE_NODE_VARS[node.id]) {
      node.color = readCSSVariable(PURPLE_NODE_VARS[node.id], node.color);
    } else if (node.type === "yellow") {
      node.color = readCSSVariable(YELLOW_NODE_VAR, node.color);
    }
    // Los verdes leen CONFIG.greenNodesColor directo en draw(), no requieren update propio
  });
}

function watchThemeChanges() {
  const observer = new MutationObserver(() => {
    refreshColorsFromCSS();
  });

  // Observa <html> (habitual en data-theme) y <body> (por si acaso)
  observer.observe(document.documentElement, {
    attributes: true,
    attributeFilter: ["data-theme", "class"]
  });

  if (document.body) {
    observer.observe(document.body, {
      attributes: true,
      attributeFilter: ["data-theme", "class"]
    });
  }
}

// Inicialización
initNetwork();
watchThemeChanges();
requestAnimationFrame(animate);