import React from 'react';
import type { Player } from '../types';

export type PieceType = 'knight' | 'warrior' | 'wizard';

// Hex color parser and manipulator
function parseHex(hex: string): [number, number, number] {
  let c = hex.replace('#', '').trim();
  if (c.length === 3) {
    c = c[0] + c[0] + c[1] + c[1] + c[2] + c[2];
  }
  const num = parseInt(c, 16);
  if (isNaN(num)) {
    return [56, 189, 248]; // default sky blue
  }
  return [(num >> 16) & 255, (num >> 8) & 255, num & 255];
}

function rgbToHex(r: number, g: number, b: number): string {
  const clamp = (v: number) => Math.max(0, Math.min(255, Math.round(v)));
  return '#' + [clamp(r), clamp(g), clamp(b)].map((x) => x.toString(16).padStart(2, '0')).join('');
}

function adjustColor(hex: string, percent: number): string {
  const [r, g, b] = parseHex(hex);
  if (percent > 0) {
    return rgbToHex(
      r + (255 - r) * percent,
      g + (255 - g) * percent,
      b + (255 - b) * percent
    );
  } else {
    const factor = 1 + percent;
    return rgbToHex(r * factor, g * factor, b * factor);
  }
}

// 16x16 Pixel Sprite Matrices
// Characters:
// . : transparent
// _ : miniature drop shadow
// K : dark iron armor outline (#0f172a)
// C : faction color main
// L : faction color light (+35%)
// D : faction color dark (-30%)
// M : polished plate steel (#94a3b8)
// m : steel highlight (#e2e8f0)
// S : steel shadow (#475569)
// G : gold main (#eab308)
// g : gold highlight (#fef08a)
// d : gold shadow (#a16207)
// W : white shine/glint (#ffffff)
// H : brown wood/leather haft (#78350f)
// B : miniature pedestal top (#334155)
// b : miniature pedestal rim (#1e293b)
// R : ruby gem or glowing battle eye (#ef4444)

const KNIGHT_SPRITE: string[] = [
  '......LCD.......', // Row 0: Plume crest tip in faction color
  '.....LCCD.......', // Row 1: Plume feather body
  '....KmMSK.......', // Row 2: Steel knight helm apex
  '...KmMSSSK......', // Row 3: Helm brow
  '...KMKWKSK...mW.', // Row 4: Eye slit gleam + Sword tip
  '...KSKKSSK...Mm.', // Row 5: Lower helm + Sword blade
  '.LCKMmMSKK...Mm.', // Row 6: Paired pauldron + breastplate + blade
  'LCCKmSSKGGGGGMm.', // Row 7: Shield top in color + sword crossguard
  'LCCKMSKK.KHK....', // Row 8: Shield face + sword hilt
  'DCDKMSKK.KGK....', // Row 9: Shield face + golden pommel
  '.DDK.SS.K.......', // Row 10: Shield tip + armored legs
  '..K..SS..K......', // Row 11: Iron sabatons
  '...KKKKKKKKK....', // Row 12: Pedestal top bevel
  '..KBBBBBBBBBBK..', // Row 13: Pedestal stone base
  '.KbbbbbbbbbbbbK.', // Row 14: Pedestal stone bevel rim
  '..____________..', // Row 15: Miniature drop shadow
];

const LEADER_KNIGHT_SPRITE: string[] = [
  '....g.g.g.......', // Row 0: 3-point Golden Royal Crown
  '....GgGgG.......', // Row 1: Crown band with jewels
  '....KGRGK.......', // Row 2: Crown base with Ruby gem
  '...KmMSSSK......', // Row 3: Knight visor brow
  '...KMKWKSK...mW.', // Row 4: Eye slit gleam + Sword tip
  '...KSKKSSK...Mm.', // Row 5: Lower helm + Sword blade
  '.GGKMmMSKK...Mm.', // Row 6: Golden cape clasps + breastplate + blade
  'GLCKmSSKGGGGGMm.', // Row 7: Gold-trimmed Shield + sword crossguard
  'GCCKMSKK.KHK....', // Row 8: Shield in faction color + sword hilt
  'GDDKMSKK.KGK....', // Row 9: Shield in faction color + gold pommel
  '.GGK.SS.K.......', // Row 10: Golden shield tip + armored legs
  '..K..SS..K......', // Row 11: Iron sabatons
  '...KGGGGGGGK....', // Row 12: Golden pedestal top
  '..KBBBBBBBBBBK..', // Row 13: Pedestal stone base
  '.KGGGGGGGGGGGGK.', // Row 14: Golden pedestal rim
  '..____________..', // Row 15: Miniature drop shadow
];

const WARRIOR_SPRITE: string[] = [
  '.mW..........Wm.', // Row 0: Curved battle horns
  '..Mm...KK...mM..', // Row 1: Horn bodies + helmet crest
  '...MKKmMSKKM....', // Row 2: Horn bases on Spiked Iron Helm
  '.Wm.KMMSSK.mW...', // Row 3: Dual battle-axe blades + brow
  'WmM.KKRRKK.MmW..', // Row 4: Axe blades + Fierce red eyes
  'WMMMKSSSKMMMW...', // Row 5: Full axe blades + lower iron plate
  '.KMMKMmMSKMMK...', // Row 6: Axe blade curves + iron breastplate
  '..KKKKHHKKKK....', // Row 7: Axe haft collar + spiked pauldrons
  '...KLCCCCDK.....', // Row 8: Warrior war-tunic in faction color
  '...KCCCCCCK.....', // Row 9: Faction color tunic
  '...KGKKKKGK.....', // Row 10: Spiked warrior war belt with gold rivets
  '...KHS..SHK.....', // Row 11: Leather greaves & combat boots
  '...KKKKKKKKK....', // Row 12: Pedestal top bevel
  '..KBBBBBBBBBBK..', // Row 13: Pedestal stone base
  '.KbbbbbbbbbbbbK.', // Row 14: Pedestal stone bevel rim
  '..____________..', // Row 15: Miniature drop shadow
];

const LEADER_WARRIOR_SPRITE: string[] = [
  '.g.g.g....g.g.g.', // Row 0: Golden crown horn tips
  '..GgG..KK..GgG..', // Row 1: Golden horn bodies
  '...GKKmMSKKG....', // Row 2: Golden horn bases on helmet
  '.Wm.KMMSSK.mW...', // Row 3: Battle-axe blades + brow
  'WmM.KKRRKK.MmW..', // Row 4: Axe blades + Fierce red eyes
  'WMMMKSSSKMMMW...', // Row 5: Axe blades + lower helm
  '.KMMKMmMSKMMK...', // Row 6: Axe blade curves + breastplate
  '..KKKKHHKKKK....', // Row 7: Pauldrons + haft collar
  '...KLCCCCDK.....', // Row 8: Tunic in faction color
  '...KCCCCCCK.....', // Row 9: Faction color tunic
  '...GGGGGGGG.....', // Row 10: Golden warrior war belt
  '...KHS..SHK.....', // Row 11: Leather boots
  '...KGGGGGGGK....', // Row 12: Golden pedestal top
  '..KBBBBBBBBBBK..', // Row 13: Pedestal stone base
  '.KGGGGGGGGGGGGK.', // Row 14: Golden pedestal rim
  '..____________..', // Row 15: Miniature drop shadow
];

const WIZARD_SPRITE: string[] = [
  '......CC........', // Row 0: Pointed wizard hat tip
  '.....LCCD.......', // Row 1: Hat cone
  '....LLCCDD......', // Row 2: Hat cone body
  '...GLLCCDDG.gW..', // Row 3: Golden hat buckle + Staff crystal shine
  '..KCCCCCCCCK.Gg.', // Row 4: Wide hat brim + Staff orb
  '...KWWWWWWK..KH.', // Row 5: Face & white flowing beard + wood staff
  '...KWBRBWK...KH.', // Row 6: Glowing mystic eyes + beard + staff
  '.LCKWWWWWWK..KH.', // Row 7: Robe shoulders + beard + staff
  'LCCKLLCCDDG..KH.', // Row 8: Robe body with golden clasp + staff
  'DCDKLLCCDDK..KH.', // Row 9: Flowing robe + staff
  '.DDKLLCCDDK..KH.', // Row 10: Robe lower + staff
  '..K.KBBBBK.K.KH.', // Row 11: Mystic boots + staff base
  '...KKKKKKKKK....', // Row 12: Pedestal top bevel
  '..KBBBBBBBBBBK..', // Row 13: Pedestal stone base
  '.KCCCCCCCCCCCCK.', // Row 14: Pedestal rim in robe color
  '..____________..', // Row 15: Miniature drop shadow
];

// Palette generation
function getPalette(color: string): Record<string, string> {
  const cMain = color.trim().startsWith('#') ? color.trim() : `#${color.trim()}`;
  const cLight = adjustColor(cMain, 0.40);
  const cDark = adjustColor(cMain, -0.32);

  return {
    '.': '', // transparent
    '_': 'rgba(0, 0, 0, 0.45)', // drop shadow
    'K': '#0f172a', // dark outline
    'C': cMain,
    'L': cLight,
    'D': cDark,
    'M': '#94a3b8', // plate steel
    'm': '#e2e8f0', // steel highlight
    'S': '#475569', // steel shadow
    'G': '#eab308', // gold main
    'g': '#fef08a', // gold light
    'd': '#a16207', // gold dark
    'W': '#ffffff', // white glint
    'H': '#78350f', // wood / leather
    'h': '#451a03', // wood dark
    'B': '#334155', // pedestal stone
    'b': '#1e293b', // pedestal rim
    'R': '#ef4444', // ruby / battle eyes
  };
}

// In-memory cache for pre-rendered 16x16 canvases and data URLs
const spriteCanvasCache = new Map<string, HTMLCanvasElement>();
const spriteDataUrlCache = new Map<string, string>();

export function getPlayerPieceType(player: {
  name: string;
  id?: string;
  piece_type?: string;
  is_party_leader?: boolean;
  party_id?: string | null;
}): PieceType {
  // Party leaders are always Knights commanding the squad
  if (player.is_party_leader) {
    return 'knight';
  }
  // Party squad followers are loyal Warriors
  if (player.party_id && !player.is_party_leader) {
    return 'warrior';
  }
  // Explicit piece type if present
  if (player.piece_type === 'warrior' || player.piece_type === 'knight') {
    return player.piece_type;
  }
  // Check name indicators
  const lower = player.name.toLowerCase();
  if (
    lower.includes('knight') ||
    lower.includes('tank') ||
    lower.includes('titan') ||
    lower.includes('paladin') ||
    lower.includes('gear') ||
    lower.includes('iron') ||
    lower.includes('guard')
  ) {
    return 'knight';
  }
  if (
    lower.includes('warrior') ||
    lower.includes('viper') ||
    lower.includes('striker') ||
    lower.includes('scout') ||
    lower.includes('ranger') ||
    lower.includes('axe') ||
    lower.includes('blade')
  ) {
    return 'warrior';
  }
  // Deterministic stable hash for variety
  let hash = 0;
  const str = player.id || player.name;
  for (let i = 0; i < str.length; i++) {
    hash = (hash << 5) - hash + str.charCodeAt(i);
    hash |= 0;
  }
  return Math.abs(hash) % 2 === 0 ? 'knight' : 'warrior';
}

export function getSpriteCanvas(
  pieceType: PieceType,
  color: string,
  isLeader: boolean = false
): HTMLCanvasElement {
  const normColor = (color || '#38bdf8').toLowerCase();
  const cacheKey = `${pieceType}_${normColor}_${isLeader ? '1' : '0'}`;

  const cached = spriteCanvasCache.get(cacheKey);
  if (cached) {
    return cached;
  }

  const canvas = document.createElement('canvas');
  canvas.width = 16;
  canvas.height = 16;
  const ctx = canvas.getContext('2d');

  if (ctx) {
    let spriteMatrix: string[];
    if (pieceType === 'knight') {
      spriteMatrix = isLeader ? LEADER_KNIGHT_SPRITE : KNIGHT_SPRITE;
    } else if (pieceType === 'wizard') {
      spriteMatrix = WIZARD_SPRITE;
    } else {
      spriteMatrix = isLeader ? LEADER_WARRIOR_SPRITE : WARRIOR_SPRITE;
    }

    const palette = getPalette(normColor);

    for (let y = 0; y < 16; y++) {
      const row = spriteMatrix[y] || '................';
      for (let x = 0; x < 16; x++) {
        const char = row[x] || '.';
        const col = palette[char];
        if (col) {
          ctx.fillStyle = col;
          ctx.fillRect(x, y, 1, 1);
        }
      }
    }
  }

  spriteCanvasCache.set(cacheKey, canvas);
  return canvas;
}

export function getSpriteDataUrl(
  pieceType: PieceType,
  color: string,
  isLeader: boolean = false
): string {
  const normColor = (color || '#38bdf8').toLowerCase();
  const cacheKey = `${pieceType}_${normColor}_${isLeader ? '1' : '0'}`;

  const cached = spriteDataUrlCache.get(cacheKey);
  if (cached) {
    return cached;
  }

  const canvas = getSpriteCanvas(pieceType, normColor, isLeader);
  const dataUrl = canvas.toDataURL('image/png');
  spriteDataUrlCache.set(cacheKey, dataUrl);
  return dataUrl;
}

// Canvas Drawing Helper for BoardCanvas
export function drawPlayerPiece(
  ctx: CanvasRenderingContext2D,
  player: Player,
  px: number,
  py: number,
  cellSize: number,
  isSelected: boolean,
  isCurrentTurn: boolean
): void {
  const pieceType = getPlayerPieceType(player);
  const isLeader = player.is_party_leader;
  const spriteCanvas = getSpriteCanvas(pieceType, player.color, isLeader);

  // Scaled miniature size: board game miniature looks best at ~1.35x cellSize
  const spriteSize = Math.max(cellSize * 1.35, 14);
  const destX = Math.round(px - spriteSize / 2);
  // Center the pedestal base right on (px, py)
  const destY = Math.round(py - spriteSize * 0.62);

  ctx.save();

  // Active turn indicator glowing ring around the pedestal
  if (isCurrentTurn) {
    ctx.save();
    ctx.beginPath();
    ctx.ellipse(px, py + spriteSize * 0.18, spriteSize * 0.55, spriteSize * 0.28, 0, 0, Math.PI * 2);
    ctx.fillStyle = 'rgba(245, 158, 11, 0.28)';
    ctx.fill();
    ctx.strokeStyle = '#f59e0b';
    ctx.lineWidth = 1.8;
    ctx.shadowColor = '#f59e0b';
    ctx.shadowBlur = 8;
    ctx.stroke();
    ctx.restore();
  }

  // Selected player dashed ring around the pedestal
  if (isSelected) {
    ctx.save();
    ctx.beginPath();
    ctx.ellipse(px, py + spriteSize * 0.18, spriteSize * 0.62, spriteSize * 0.32, 0, 0, Math.PI * 2);
    ctx.strokeStyle = '#38bdf8';
    ctx.lineWidth = 2;
    ctx.setLineDash([3, 3]);
    ctx.shadowColor = '#38bdf8';
    ctx.shadowBlur = 6;
    ctx.stroke();
    ctx.restore();
  }

  // Draw the crisp pixelated Knight or Warrior figurine
  ctx.imageSmoothingEnabled = false;
  ctx.drawImage(spriteCanvas, destX, destY, spriteSize, spriteSize);

  // Crown symbol above party leader
  if (isLeader) {
    ctx.save();
    ctx.fillStyle = '#fbbf24';
    ctx.font = `${Math.max(spriteSize * 0.45, 10)}px sans-serif`;
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.fillText('👑', px, destY - 4);
    ctx.restore();
  }

  // Player Name and Strength Badge (Title Bar)
  ctx.save();
  const isHighlighted = isCurrentTurn || isSelected;
  ctx.globalAlpha = isHighlighted ? 1.0 : 0.5;

  ctx.font = `bold ${Math.max(10, Math.min(12, cellSize * 0.42))}px Inter, sans-serif`;
  ctx.textAlign = 'center';
  ctx.textBaseline = 'middle';

  const roleIcon = isLeader ? '👑' : pieceType === 'knight' ? '⚔️' : '🪓';
  const hpBadge = player.health !== undefined ? ` ❤️${player.health}` : '';
  const text = `${roleIcon} ${player.name} [⚡${player.strength.toFixed(1)}${hpBadge}]`;
  const textMetrics = ctx.measureText(text);
  const bgWidth = textMetrics.width + 12;
  const bgHeight = 16;
  const labelY = isLeader ? destY - 14 : destY - 8;

  ctx.fillStyle = 'rgba(15, 23, 42, 0.92)';
  ctx.strokeStyle = isLeader ? '#fbbf24' : isCurrentTurn ? '#f59e0b' : player.color;
  ctx.lineWidth = 1;
  ctx.beginPath();
  ctx.roundRect(px - bgWidth / 2, labelY - 12, bgWidth, bgHeight, 4);
  ctx.fill();
  ctx.stroke();

  ctx.fillStyle = isLeader ? '#fef08a' : isCurrentTurn ? '#fbbf24' : '#f8fafc';
  ctx.fillText(text, px, labelY - 4);
  ctx.restore();

  ctx.restore();
}

// Canvas Drawing Helper for the Grand Wizard NPC
export function drawWizardPiece(
  ctx: CanvasRenderingContext2D,
  wizard: { x: number; y: number; name: string; strength: number; color?: string },
  px: number,
  py: number,
  cellSize: number
): void {
  const color = wizard.color || '#A855F7';
  const spriteCanvas = getSpriteCanvas('wizard', color, false);

  const spriteSize = Math.max(cellSize * 1.45, 16);
  const destX = Math.round(px - spriteSize / 2);
  const destY = Math.round(py - spriteSize * 0.62);

  ctx.save();

  // Glowing mystic arcane aura
  ctx.save();
  ctx.beginPath();
  ctx.ellipse(px, py + spriteSize * 0.18, spriteSize * 0.65, spriteSize * 0.32, 0, 0, Math.PI * 2);
  ctx.fillStyle = 'rgba(168, 85, 247, 0.25)';
  ctx.fill();
  ctx.strokeStyle = '#c084fc';
  ctx.lineWidth = 2;
  ctx.shadowColor = '#c084fc';
  ctx.shadowBlur = 12;
  ctx.stroke();
  ctx.restore();

  // Draw the pixelated Wizard
  ctx.imageSmoothingEnabled = false;
  ctx.drawImage(spriteCanvas, destX, destY, spriteSize, spriteSize);

  // Floating magic sparkle above wizard hat
  ctx.save();
  ctx.fillStyle = '#fef08a';
  ctx.font = `${Math.max(spriteSize * 0.4, 10)}px sans-serif`;
  ctx.textAlign = 'center';
  ctx.textBaseline = 'middle';
  ctx.fillText('✨', px, destY - 6);
  ctx.restore();

  // Wizard Name & Strength Badge
  ctx.save();
  ctx.font = `bold ${Math.max(10, Math.min(12, cellSize * 0.42))}px Inter, sans-serif`;
  ctx.textAlign = 'center';
  ctx.textBaseline = 'middle';

  const text = `🧙 ${wizard.name} [⚡${wizard.strength.toFixed(1)}]`;
  const textMetrics = ctx.measureText(text);
  const bgWidth = textMetrics.width + 12;
  const bgHeight = 16;
  const labelY = destY - 16;

  ctx.fillStyle = 'rgba(15, 23, 42, 0.94)';
  ctx.strokeStyle = '#c084fc';
  ctx.lineWidth = 1.2;
  ctx.shadowColor = '#c084fc';
  ctx.shadowBlur = 8;
  ctx.beginPath();
  ctx.roundRect(px - bgWidth / 2, labelY - 12, bgWidth, bgHeight, 4);
  ctx.fill();
  ctx.stroke();

  ctx.fillStyle = '#e9d5ff';
  ctx.fillText(text, px, labelY - 4);
  ctx.restore();

  ctx.restore();
}

// React Component for displaying pixel avatar in UI
interface PixelAvatarProps {
  pieceType: PieceType;
  color: string;
  isLeader?: boolean;
  size?: number;
  className?: string;
  title?: string;
}

export const PixelAvatar: React.FC<PixelAvatarProps> = ({
  pieceType,
  color,
  isLeader = false,
  size = 32,
  className = '',
  title,
}) => {
  const dataUrl = getSpriteDataUrl(pieceType, color, isLeader);

  return (
    <img
      src={dataUrl}
      alt={`${isLeader ? 'Leader ' : ''}${pieceType}`}
      title={title || `${isLeader ? 'Leader ' : ''}${pieceType} (${color})`}
      className={`inline-block ${className}`}
      style={{
        width: size,
        height: size,
        imageRendering: 'pixelated',
      }}
    />
  );
};