import type Phaser from 'phaser'
import {
  MAP_COLS,
  MAP_ROWS,
  GAME_WIDTH,
  GAME_HEIGHT,
  HUD_HEIGHT,
  PATH_WAYPOINTS,
  COLOR_PATH,
  COLOR_BUILDABLE,
  COLOR_HOVER,
  COLOR_BORDER,
  MAP_LABELS,
  INITIAL_KPI,
} from './constants'

/** 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
}

export const PATH_TILES = buildPathTiles(PATH_WAYPOINTS)

/** 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)          // 80
  const rawH = Math.floor((GAME_HEIGHT - HUD_HEIGHT) / MAP_ROWS) // 55
  const cell = Math.min(rawW, rawH)                        // 55 → 正方形
  return { cellW: cell, cellH: cell }
}

/**
 * 绘制所有地图格子
 */
export function drawAllTiles(
  g: Phaser.GameObjects.Graphics,
  hovered: { col: number; row: number } | null
): void {
  const { cellW, cellH } = getCellSize()
  g.clear()

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

      const fillColor = isPath
        ? COLOR_PATH
        : isHovered ? COLOR_HOVER : COLOR_BUILDABLE

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

      g.fillStyle(fillColor, 1)
      g.fillRect(x + 1, y + 1, cellW - 2, cellH - 2)
      g.lineStyle(1, COLOR_BORDER, 0.6)
      g.strokeRect(x, y, cellW, cellH)
    }
  }
}

/**
 * 渲染地图装饰性标签
 */
export function renderMapLabels(scene: Phaser.Scene): void {
  const { cellW, cellH } = getCellSize()
  for (const label of MAP_LABELS) {
    const x = label.col * cellW + cellW / 2
    const y = HUD_HEIGHT + label.row * cellH + cellH / 2
    scene.add
      .text(x, y, label.text, {
        fontFamily: 'VT323, monospace',
        fontSize: '14px',
        color: '#A78BFA',
      })
      .setOrigin(0.5, 0.5)
      .setAlpha(0.5)
  }
}

/** 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
} {
  // HUD 背景
  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)

  // 左侧标题
  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)

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

  // 进度条背景轨道
  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)

  // KPI 进度前景
  const kpiBar = scene.add.graphics()
  updateKPIBar(kpiBar, INITIAL_KPI)

  // KPI 百分比文字
  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)

  // 右侧 HC 数值
  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)
}