/**
 * 扑克牌布局数据 & 通用工具函数
 *
 * 这里和后端 apps/exports/utils.py 保持一致。
 * 实际渲染在前端用 canvas（drawCard），后端用 PIL（generate_card_png）。
 */

// 数字牌 1-10 的花色位置（相对坐标 0~1）
export const LAYOUT_POSITIONS = {
  1:  [{ x: 0.50, y: 0.50 }],
  2:  [{ x: 0.50, y: 0.25 }, { x: 0.50, y: 0.75 }],
  3:  [{ x: 0.50, y: 0.20 }, { x: 0.50, y: 0.50 }, { x: 0.50, y: 0.80 }],
  4:  [{ x: 0.30, y: 0.25 }, { x: 0.70, y: 0.25 }, { x: 0.30, y: 0.75 }, { x: 0.70, y: 0.75 }],
  5:  [{ x: 0.30, y: 0.20 }, { x: 0.70, y: 0.20 }, { x: 0.50, y: 0.50 }, { x: 0.30, y: 0.80 }, { x: 0.70, y: 0.80 }],
  6:  [{ x: 0.30, y: 0.20 }, { x: 0.70, y: 0.20 }, { x: 0.30, y: 0.50 }, { x: 0.70, y: 0.50 }, { x: 0.30, y: 0.80 }, { x: 0.70, y: 0.80 }],
  7:  [{ x: 0.30, y: 0.15 }, { x: 0.70, y: 0.15 }, { x: 0.50, y: 0.35 }, { x: 0.30, y: 0.55 }, { x: 0.70, y: 0.55 }, { x: 0.30, y: 0.85 }, { x: 0.70, y: 0.85 }],
  8:  [{ x: 0.30, y: 0.15 }, { x: 0.70, y: 0.15 }, { x: 0.50, y: 0.32 }, { x: 0.30, y: 0.50 }, { x: 0.70, y: 0.50 }, { x: 0.50, y: 0.68 }, { x: 0.30, y: 0.85 }, { x: 0.70, y: 0.85 }],
  9:  [{ x: 0.30, y: 0.15 }, { x: 0.70, y: 0.15 }, { x: 0.50, y: 0.30 }, { x: 0.22, y: 0.50 }, { x: 0.50, y: 0.50 }, { x: 0.78, y: 0.50 }, { x: 0.50, y: 0.70 }, { x: 0.30, y: 0.85 }, { x: 0.70, y: 0.85 }],
  10: [{ x: 0.30, y: 0.15 }, { x: 0.70, y: 0.15 }, { x: 0.30, y: 0.35 }, { x: 0.70, y: 0.35 }, { x: 0.50, y: 0.45 }, { x: 0.50, y: 0.55 }, { x: 0.30, y: 0.65 }, { x: 0.70, y: 0.65 }, { x: 0.30, y: 0.85 }, { x: 0.70, y: 0.85 }],
}

export const SUIT_TEXT = {
  spade:   '♠',
  heart:   '♥',
  club:    '♣',
  diamond: '♦',
}

export const SUIT_LABELS = {
  spade: '♠ 黑桃',
  heart: '♥ 红桃',
  club: '♣ 梅花',
  diamond: '♦ 方块',
}

export const SUIT_COLORS = {
  spade: '#000000',
  heart: '#E53935',
  club: '#000000',
  diamond: '#E53935',
}

export const RANKS = ['A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K']

export const SUITS = ['spade', 'heart', 'club', 'diamond']

export const JOKERS = [
  { key: 'joker-big',   label: '大王', defaultColor: '#1B5E20' },
  { key: 'joker-small', label: '小王', defaultColor: '#B71C1C' },
]

/**
 * 合并项目级 design 与单牌覆盖
 */
export function getEffectiveDesign(project, cardKey) {
  const base = JSON.parse(JSON.stringify(project?.design || {}))
  const overrides = (project?.card_overrides || {})[cardKey] || {}
  return { ...base, ...overrides }
}

/**
 * 计算数字牌 (1-10) 实际的花色位置（绝对像素）
 *  - 默认按 LAYOUT_POSITIONS
 *  - 项目可保存 number_layout 做微调
 */
export function computeNumberPipPositions(rank, cardW, cardH, pipSize, numberLayout) {
  const rankInt = parseInt(rank, 10) || 1
  const defaults = LAYOUT_POSITIONS[rankInt] || LAYOUT_POSITIONS[1]
  const userOverrides = (numberLayout || {})[String(rankInt)] || []
  return defaults.map((p, i) => {
    const o = userOverrides[i] || {}
    const dx = Number(o.dx) || 0
    const dy = Number(o.dy) || 0
    const scale = Number(o.scale) || 1
    return {
      x: (p.x + dx) * cardW,
      y: (p.y + dy) * cardH,
      size: Math.max(20, pipSize * scale),
    }
  })
}

/**
 * 解析一个花色 key 是否为红色系
 */
export function isRedSuit(suit) {
  return suit === 'heart' || suit === 'diamond'
}

export function isBlackSuit(suit) {
  return suit === 'spade' || suit === 'club'
}

export function isFace(rank) {
  return rank === 'J' || rank === 'Q' || rank === 'K'
}

export function isJoker(cardKey) {
  return typeof cardKey === 'string' && cardKey.startsWith('joker-')
}

export function isNumber(rank) {
  return RANKS.indexOf(rank) >= 0 && !isFace(rank)
}

/**
 * 列出全部 54 张牌 + 背面
 */
export function listAllCards() {
  const out = []
  for (const s of SUITS) {
    for (const r of RANKS) {
      out.push({ key: `${s}-${r}`, suit: s, rank: r, type: isFace(r) ? 'face' : 'number' })
    }
  }
  out.push({ key: 'joker-big',   suit: null, rank: null, type: 'joker' })
  out.push({ key: 'joker-small', suit: null, rank: null, type: 'joker' })
  out.push({ key: 'back',        suit: null, rank: null, type: 'back' })
  return out
}

export const DEFAULT_DESIGN = {
  background_color: '#FFFFFF',
  background_image: null,
  border_color: '#333333',
  border_width: 2,
  suit_symbols: {
    spade:   { type: 'text', value: '♠', asset_id: null, color: '#000000' },
    heart:   { type: 'text', value: '♥', asset_id: null, color: '#E53935' },
    club:    { type: 'text', value: '♣', asset_id: null, color: '#000000' },
    diamond: { type: 'text', value: '♦', asset_id: null, color: '#E53935' },
  },
  corner_size_ratio: 0.13,
  pip_size_ratio: 0.16,
  font_family: 'Times New Roman',
  font_color: '#000000',
  corner_offset: { x: 0, y: 0 },
}