import type Phaser from 'phaser'
import {
  MAP_COLS,
  MAP_ROWS,
  GAME_WIDTH,
  GAME_HEIGHT,
  HUD_HEIGHT,
  INITIAL_KPI,
} from './constants'
import type { MapConfig } from './data/mapConfigs'
import { ALL_MAPS } from './data/mapConfigs'

// ─── PATH TILES ────────────────────────────────────────────────────────────────

/** 将折线关键坐标点展开为完整路径格子集合 */
export function buildPathTiles(
  waypoints: readonly { x: number; y: number }[]
): Set<string> {
  const tiles = new Set<string>()
  for (let i = 0; i < waypoints.length - 1; i++) {
    const from = waypoints[i]
    const to = waypoints[i + 1]
    if (from.x === to.x) {
      const minY = Math.min(from.y, to.y)
      const maxY = Math.max(from.y, to.y)
      for (let y = minY; y <= maxY; y++) tiles.add(`${from.x},${y}`)
    } else {
      const minX = Math.min(from.x, to.x)
      const maxX = Math.max(from.x, to.x)
      for (let x = minX; x <= maxX; x++) tiles.add(`${x},${from.y}`)
    }
  }
  return tiles
}

/**
 * 向后兼容导出：用地图1配置初始化（GameScene 内部用局部变量覆盖）
 */
export const PATH_TILES = buildPathTiles(ALL_MAPS[0].waypoints)

// ─── CELL SIZE ────────────────────────────────────────────────────────────────

/** 计算格子尺寸（正方形格子，取宽高中较小值保证正方形） */
export function getCellSize() {
  const rawW = Math.floor(GAME_WIDTH / MAP_COLS)
  const rawH = Math.floor((GAME_HEIGHT - HUD_HEIGHT) / MAP_ROWS)
  const cell = Math.min(rawW, rawH)
  return { cellW: cell, cellH: cell }
}

// ─── TILE RENDERING ───────────────────────────────────────────────────────────

/**
 * 绘制所有地图格子
 * @param pathTiles 当前地图的路径格集合（若不传则用模块级默认值）
 * @param mapConfig 当前地图配置，用于读取颜色（可选，默认用地图1颜色）
 */
export function drawAllTiles(
  g: Phaser.GameObjects.Graphics,
  hovered: { col: number; row: number } | null,
  pathTiles?: Set<string>,
  mapConfig?: MapConfig
): void {
  const { cellW, cellH } = getCellSize()
  const tiles = pathTiles ?? PATH_TILES
  const pathColor  = mapConfig?.pathColor  ?? 0x3d2b1f
  const hoverColor = 0x7c3aed

  g.clear()

  for (let row = 0; row < MAP_ROWS; row++) {
    for (let col = 0; col < MAP_COLS; col++) {
      const key = `${col},${row}`
      const isPath    = tiles.has(key)
      const isHovered = !isPath && hovered?.col === col && hovered?.row === row

      const x = col * cellW
      const y = HUD_HEIGHT + row * cellH

      if (isPath) {
        // 路径格：半透明深色叠加，让背景隐约可见
        g.fillStyle(pathColor, 0.78)
        g.fillRect(x, y, cellW, cellH)
        // 路径边框：稍亮一点
        g.lineStyle(1, 0x6b4226, 0.9)
        g.strokeRect(x, y, cellW, cellH)
      } else if (isHovered) {
        // 悬停格：紫色高亮半透明
        g.fillStyle(hoverColor, 0.35)
        g.fillRect(x, y, cellW, cellH)
        g.lineStyle(2, 0xa78bfa, 0.9)
        g.strokeRect(x, y, cellW, cellH)
      } else {
        // 可建格：只画细边框，背景图完全透出
        g.lineStyle(1, 0x334155, 0.35)
        g.strokeRect(x, y, cellW, cellH)
      }
    }
  }
}

// ─── MAP LABELS ───────────────────────────────────────────────────────────────

/**
 * 渲染地图区域标签，返回创建的文字对象（便于切图时销毁）
 */
export function renderMapLabels(
  scene: Phaser.Scene,
  labels?: { col: number; row: number; text: string }[]
): Phaser.GameObjects.Text[] {
  const { cellW, cellH } = getCellSize()
  const list = labels ?? ALL_MAPS[0].labels
  return list.map(label => {
    const x = label.col * cellW + cellW / 2
    const y = HUD_HEIGHT + label.row * cellH + cellH / 2
    return scene.add
      .text(x, y, label.text, {
        fontFamily: 'VT323, monospace',
        fontSize: '13px',
        color: '#e2e8f0',
        backgroundColor: 'rgba(0,0,0,0.55)',
        padding: { x: 5, y: 2 },
      })
      .setOrigin(0.5, 0.5)
      .setDepth(2)
      .setAlpha(0.85)
  })
}

// ─── BACKGROUND ───────────────────────────────────────────────────────────────

/**
 * 渲染地图背景图（铺满地图区域，HUD 下方）
 * 返回创建的 Image 对象，切图时需 destroy
 */
export function renderMapBackground(
  scene: Phaser.Scene,
  bgKey: string
): Phaser.GameObjects.Image | null {
  if (!scene.textures.exists(bgKey)) return null

  const { cellW, cellH } = getCellSize()
  const mapW = MAP_COLS * cellW
  const mapH = MAP_ROWS * cellH

  return scene.add
    .image(0, HUD_HEIGHT, bgKey)
    .setDisplaySize(mapW, mapH)
    .setDepth(-1)
    .setOrigin(0, 0)
}

// ─── DECORATIONS ─────────────────────────────────────────────────────────────

/**
 * 渲染地图区域标签文字（替代图片装饰物，不破坏背景图视觉）
 * 返回对象数组（切图时销毁）
 */
export function renderDecorations(
  scene: Phaser.Scene,
  decorations: MapConfig['decorations'],
  pathTiles: Set<string>
): Phaser.GameObjects.Image[] {
  // 装饰物改为纯文字标注，不再叠加图片，直接返回空数组
  // 视觉信息已由地图标签（renderMapLabels）和背景图承载
  void scene; void decorations; void pathTiles
  return []
}

// ─── HUD ──────────────────────────────────────────────────────────────────────

/** HUD 进度条参数 */
export const BAR_W = 300
export const BAR_H = 16
export const BAR_X = (GAME_WIDTH - BAR_W) / 2
export const BAR_Y = (HUD_HEIGHT - BAR_H) / 2

/**
 * 渲染顶部 HUD 区域，返回可更新的 Graphics 和 Text 对象
 */
export function renderHUD(scene: Phaser.Scene): {
  kpiBar: Phaser.GameObjects.Graphics
  kpiText: Phaser.GameObjects.Text
  hcText: Phaser.GameObjects.Text
} {
  const hudBg = scene.add.graphics()
  hudBg.fillStyle(0x0a1628, 0.92)
  hudBg.fillRect(0, 0, GAME_WIDTH, HUD_HEIGHT)
  hudBg.lineStyle(1, 0x1e3a5f, 1)
  hudBg.strokeRect(0, 0, GAME_WIDTH, HUD_HEIGHT)

  scene.add.text(16, HUD_HEIGHT / 2, '大厂保卫战', {
    fontFamily: "'Press Start 2P', monospace",
    fontSize: '10px',
    color: '#A78BFA',
  }).setOrigin(0, 0.5)

  scene.add.text(BAR_X - 8, HUD_HEIGHT / 2, 'KPI', {
    fontFamily: "'Press Start 2P', monospace",
    fontSize: '8px',
    color: '#E2E8F0',
  }).setOrigin(1, 0.5)

  const trackBar = scene.add.graphics()
  trackBar.fillStyle(0x1a1a2e, 1)
  trackBar.fillRect(BAR_X, BAR_Y, BAR_W, BAR_H)
  trackBar.lineStyle(1, 0x7c3aed, 0.6)
  trackBar.strokeRect(BAR_X, BAR_Y, BAR_W, BAR_H)

  const kpiBar = scene.add.graphics()
  updateKPIBar(kpiBar, INITIAL_KPI)

  const kpiText = scene.add.text(
    BAR_X + BAR_W / 2, HUD_HEIGHT / 2,
    `${INITIAL_KPI}%`,
    {
      fontFamily: "'Press Start 2P', monospace",
      fontSize: '8px',
      color: '#E2E8F0',
    }
  ).setOrigin(0.5, 0.5).setDepth(1)

  const hcText = scene.add.text(
    GAME_WIDTH - 16, HUD_HEIGHT / 2,
    `HC: 200`,
    {
      fontFamily: "'Press Start 2P', monospace",
      fontSize: '10px',
      color: '#A78BFA',
    }
  ).setOrigin(1, 0.5)

  return { kpiBar, kpiText, hcText }
}

/**
 * 更新 KPI 进度条（颜色随数值变化：绿→黄→红）
 */
export function updateKPIBar(
  kpiBar: Phaser.GameObjects.Graphics,
  kpi: number
): void {
  kpiBar.clear()
  const color = kpi > 60 ? 0x22c55e : kpi > 30 ? 0xf59e0b : 0xef4444
  kpiBar.fillStyle(color, 1)
  kpiBar.fillRect(BAR_X + 1, BAR_Y + 1, (BAR_W - 2) * (kpi / 100), BAR_H - 2)
}