"use client";

import React from "react";

function NodeBadge({ children, tone = "gray" }) {
  const tones = {
    gray: "border-gray-200 bg-gray-50 text-gray-700",
    blue: "border-blue-200 bg-blue-50 text-blue-700",
    green: "border-green-200 bg-green-50 text-green-700",
    yellow: "border-yellow-200 bg-yellow-50 text-yellow-700",
    red: "border-red-200 bg-red-50 text-red-700",
    purple: "border-purple-200 bg-purple-50 text-purple-700",
  };

  return (
    <span className={`rounded-full border px-2 py-0.5 text-xs ${tones[tone] || tones.gray}`}>
      {children}
    </span>
  );
}

function NodeGroup({
  title,
  nodes,
  resolvedNodeIds = new Set(),
  newlySurfacedNodeIds = new Set(),
  activeUnknownNodeId = null,
}) {
  if (!nodes?.length) return null;

  return (
    <section className="rounded-lg border border-gray-200 bg-white p-4">
      <h3 className="mb-3 text-sm font-semibold text-gray-700">
        {title} ({nodes.length})
      </h3>
      <ul className="space-y-3">
        {nodes.map((node) => (
          <li key={node.id} className="rounded border border-gray-100 bg-gray-50 p-3 text-sm">
            <div className="flex flex-wrap items-center gap-2">
              <span className="font-medium text-gray-900">{node.label}</span>
              <NodeBadge tone="blue">{node.status}</NodeBadge>
              <NodeBadge tone="green">{node.confidence}</NodeBadge>
              {resolvedNodeIds.has(node.id) && (
                <NodeBadge tone="red">resolved unknown</NodeBadge>
              )}
              {newlySurfacedNodeIds.has(node.id) && (
                <NodeBadge tone="purple">newly surfaced unknown</NodeBadge>
              )}
              {activeUnknownNodeId === node.id && (
                <NodeBadge tone="yellow">active unknown</NodeBadge>
              )}
              {node.value != null && (
                <NodeBadge tone="yellow">
                  {node.value}
                  {node.unit ? ` ${node.unit}` : ""}
                </NodeBadge>
              )}
            </div>
            {node.description && node.description !== node.label && (
              <p className="mt-1 text-gray-600">{node.description}</p>
            )}
          </li>
        ))}
      </ul>
    </section>
  );
}

export default function SituationGraphView({
  situationGraph,
  selectedQuestion,
  newlySurfacedNodeIds = [],
}) {
  if (!situationGraph) return null;

  const selectedQuestionText =
    typeof selectedQuestion === "string"
      ? selectedQuestion
      : selectedQuestion?.question ?? null;

  const activeUnknown = situationGraph.activeUnknownNodeId
    ? situationGraph.nodes.find((node) => node.id === situationGraph.activeUnknownNodeId)
    : null;

  const nodesByKind = situationGraph.nodes.reduce((acc, node) => {
    if (!acc[node.kind]) acc[node.kind] = [];
    acc[node.kind].push(node);
    return acc;
  }, {});

  const resolvedNodeIdSet = new Set(situationGraph.resolvedNodeIds || []);
  const newlySurfacedNodeIdSet = new Set(newlySurfacedNodeIds || []);

  return (
    <div className="space-y-4">
      {selectedQuestionText && (
        <section className="rounded-lg border-2 border-green-300 bg-green-50 p-5">
          <h2 className="mb-2 text-base font-bold text-green-800">Selected Question</h2>
          <p className="text-base font-medium text-gray-900">{selectedQuestionText}</p>
        </section>
      )}

      <section className="rounded-lg border border-gray-200 bg-white p-4">
        <h2 className="mb-2 text-base font-semibold text-gray-900">Situation Graph</h2>
        <dl className="space-y-2 text-sm">
          <div>
            <dt className="text-gray-500">Central statement</dt>
            <dd className="font-medium text-gray-900">{situationGraph.centralStatement}</dd>
          </div>
          {situationGraph.currentSummary && (
            <div>
              <dt className="text-gray-500">Current summary</dt>
              <dd className="text-gray-800">{situationGraph.currentSummary}</dd>
            </div>
          )}
          {activeUnknown && (
            <div>
              <dt className="text-gray-500">Active unknown</dt>
              <dd className="text-gray-900">{activeUnknown.label}</dd>
            </div>
          )}
          <div>
            <dt className="text-gray-500">Edge count</dt>
            <dd className="text-gray-900">{situationGraph.edges.length}</dd>
          </div>
        </dl>
      </section>

      {Object.entries(nodesByKind).map(([kind, nodes]) => (
        <NodeGroup
          key={kind}
          title={kind.replace(/_/g, " ")}
          nodes={nodes}
          resolvedNodeIds={resolvedNodeIdSet}
          newlySurfacedNodeIds={newlySurfacedNodeIdSet}
          activeUnknownNodeId={situationGraph.activeUnknownNodeId}
        />
      ))}

      <details className="rounded-lg border border-gray-200 bg-gray-50 p-4">
        <summary className="cursor-pointer text-sm font-medium text-gray-700 underline">
          Raw graph JSON
        </summary>
        <pre className="mt-3 overflow-auto rounded bg-gray-900 p-3 text-xs text-green-400">
          {JSON.stringify(situationGraph, null, 2)}
        </pre>
      </details>
    </div>
  );
}