/**
 * AI Town — Relationship Graph Visualization
 * =============================================
 * Shows connections between characters with sentiment colors.
 */

import React from "react";
import { View, Text, ScrollView } from "react-native";
import { Canvas, Circle, Line, vec } from "@shopify/react-native-skia";

interface Relationship {
  fromCharacterId: string;
  toCharacterId: string;
  sentiment: number;
  trust: number;
  interactionCount: number;
  relationshipType: string;
}

interface Character {
  _id: string;
  name: string;
  avatar: string;
  mood: string;
}

interface RelationshipGraphProps {
  characters: Character[];
  relationships: Relationship[];
}

export function RelationshipGraph({ characters, relationships }: RelationshipGraphProps) {
  if (characters.length === 0) {
    return (
      <View className="flex-1 items-center justify-center py-20">
        <Text className="text-gray-400">No characters yet</Text>
      </View>
    );
  }

  // Arrange characters in a circle
  const centerX = 160;
  const centerY = 160;
  const radius = 120;

  const positions = characters.map((_, i) => {
    const angle = (i / characters.length) * Math.PI * 2 - Math.PI / 2;
    return {
      x: centerX + Math.cos(angle) * radius,
      y: centerY + Math.sin(angle) * radius,
    };
  });

  return (
    <View className="bg-gray-900 rounded-2xl p-4">
      <Text className="text-white font-bold text-lg mb-3">🕸️ Relationship Web</Text>

      <Canvas style={{ width: 320, height: 320 }}>
        {/* Draw relationship edges */}
        {relationships.map((rel, i) => {
          const fromIdx = characters.findIndex((c) => c._id === rel.fromCharacterId);
          const toIdx = characters.findIndex((c) => c._id === rel.toCharacterId);
          if (fromIdx === -1 || toIdx === -1) return null;

          const color = rel.sentiment > 0.5 ? "#22c55e" : rel.sentiment > 0 ? "#60a5fa" : rel.sentiment > -0.3 ? "#f59e0b" : "#ef4444";
          const opacity = Math.min(1, Math.abs(rel.sentiment) + 0.3);

          return (
            <Line
              key={`edge-${i}`}
              p1={vec(positions[fromIdx].x, positions[fromIdx].y)}
              p2={vec(positions[toIdx].x, positions[toIdx].y)}
              color={color}
              strokeWidth={Math.max(1, rel.interactionCount * 0.5)}
              opacity={opacity}
            />
          );
        })}

        {/* Draw character nodes */}
        {positions.map((pos, i) => (
          <Circle key={`node-${i}`} cx={pos.x} cy={pos.y} r={20} color="#374151" />
        ))}
        {positions.map((pos, i) => (
          <Circle key={`inner-${i}`} cx={pos.x} cy={pos.y} r={16} color="#1f2937" />
        ))}
      </Canvas>

      {/* Character labels */}
      <View className="flex-row flex-wrap gap-2 mt-3 justify-center">
        {characters.map((char, i) => (
          <View key={char._id} className="flex-row items-center gap-1 bg-gray-800 px-2 py-1 rounded-full">
            <Text className="text-sm">{char.avatar}</Text>
            <Text className="text-gray-300 text-xs">{char.name}</Text>
          </View>
        ))}
      </View>

      {/* Legend */}
      <View className="flex-row justify-center gap-4 mt-3">
        <View className="flex-row items-center gap-1">
          <View className="w-3 h-3 rounded-full bg-green-500" />
          <Text className="text-gray-400 text-xs">Close</Text>
        </View>
        <View className="flex-row items-center gap-1">
          <View className="w-3 h-3 rounded-full bg-blue-500" />
          <Text className="text-gray-400 text-xs">Friendly</Text>
        </View>
        <View className="flex-row items-center gap-1">
          <View className="w-3 h-3 rounded-full bg-amber-500" />
          <Text className="text-gray-400 text-xs">Neutral</Text>
        </View>
        <View className="flex-row items-center gap-1">
          <View className="w-3 h-3 rounded-full bg-red-500" />
          <Text className="text-gray-400 text-xs">Tense</Text>
        </View>
      </View>
    </View>
  );
}