import Phaser from 'phaser'
import type { BuildingType, JobPriorities } from '../types'
import type { FarmingTool } from '../systems/FarmingSystem'
import { stateManager } from '../StateManager'

const ITEM_ICONS: Record<string, string> = {
  wood: '🪵', stone: '🪨', wheat_seed: '🌱', carrot_seed: '🥕',
  wheat: '🌾', carrot: '🧡',
}

export class UIScene extends Phaser.Scene {
  private stockpileTexts: Map<string, Phaser.GameObjects.Text> = new Map()
  private stockpilePanel!: Phaser.GameObjects.Rectangle
  private hintText!: Phaser.GameObjects.Text
  private toastText!: Phaser.GameObjects.Text
  private toastTimer = 0
  private buildMenuGroup!: Phaser.GameObjects.Group
  private buildMenuVisible = false
  private villagerPanelGroup!: Phaser.GameObjects.Group
  private villagerPanelVisible = false
  private buildModeText!: Phaser.GameObjects.Text
  private farmToolText!: Phaser.GameObjects.Text
  private coordsText!: Phaser.GameObjects.Text
  private controlsHintText!: Phaser.GameObjects.Text
  private popText!: Phaser.GameObjects.Text
  private stockpileTitleText!: Phaser.GameObjects.Text
  private contextMenuGroup!: Phaser.GameObjects.Group
  private contextMenuVisible = false
  private inBuildMode = false
  private inFarmMode = false

  constructor() { super({ key: 'UI' }) }

  create(): void {
    this.createStockpilePanel()
    this.createHintText()
    this.createToast()
    this.createBuildMenu()
    this.createBuildModeIndicator()
    this.createFarmToolIndicator()
    this.createCoordsDisplay()

    const gameScene = this.scene.get('Game')
    gameScene.events.on('buildModeChanged', (a: boolean, b: BuildingType) => this.onBuildModeChanged(a, b))
    gameScene.events.on('farmToolChanged',  (t: FarmingTool, l: string) => this.onFarmToolChanged(t, l))
    gameScene.events.on('toast',            (m: string) => this.showToast(m))
    gameScene.events.on('openBuildMenu',    () => this.toggleBuildMenu())
    gameScene.events.on('cameraMoved',      (pos: { tileX: number; tileY: number }) => this.onCameraMoved(pos))

    this.input.keyboard!.addKey(Phaser.Input.Keyboard.KeyCodes.B)
      .on('down', () => gameScene.events.emit('uiRequestBuildMenu'))
    this.input.keyboard!.addKey(Phaser.Input.Keyboard.KeyCodes.V)
      .on('down', () => this.toggleVillagerPanel())

    this.scale.on('resize', () => this.repositionUI())

    this.input.mouse!.disableContextMenu()
    this.contextMenuGroup = this.add.group()

    this.input.on('pointerdown', (ptr: Phaser.Input.Pointer) => {
      if (ptr.rightButtonDown()) {
        if (!this.inBuildMode && !this.inFarmMode && !this.buildMenuVisible && !this.villagerPanelVisible) {
          this.showContextMenu(ptr.x, ptr.y)
        }
      } else if (this.contextMenuVisible) {
        this.hideContextMenu()
      }
    })

    this.input.keyboard!.addKey(Phaser.Input.Keyboard.KeyCodes.ESC)
      .on('down', () => this.hideContextMenu())
  }

  update(_t: number, delta: number): void {
    this.updateStockpile()
    this.updateToast(delta)
    this.updatePopText()
  }

  // ─── Stockpile ────────────────────────────────────────────────────────────

  private createStockpilePanel(): void {
    const x = this.scale.width - 178, y = 10
    this.stockpilePanel = this.add.rectangle(x, y, 168, 165, 0x000000, 0.72).setOrigin(0, 0).setScrollFactor(0).setDepth(100)
    this.stockpileTitleText = this.add.text(x + 10, y + 7, '⚡ STOCKPILE', { fontSize: '11px', color: '#aaaaaa', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(101)
    const items = ['wood','stone','wheat_seed','carrot_seed','wheat','carrot'] as const
    items.forEach((item, i) => {
      const t = this.add.text(x + 10, y + 26 + i * 22, `${ITEM_ICONS[item]} ${item}: 0`, { fontSize: '13px', color: '#88dd88', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(101)
      this.stockpileTexts.set(item, t)
    })
    this.popText = this.add.text(x + 10, y + 145, '👥 Pop: 0 / 0', { fontSize: '11px', color: '#aaaaaa', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(101)
  }

  private updateStockpile(): void {
    const sp = stateManager.getState().world.stockpile
    for (const [item, t] of this.stockpileTexts) {
      const qty = sp[item as keyof typeof sp] ?? 0
      t.setStyle({ color: qty > 0 ? '#88dd88' : '#444444' })
      t.setText(`${ITEM_ICONS[item]} ${item}: ${qty}`)
    }
  }

  private updatePopText(): void {
    const state = stateManager.getState()
    const beds    = Object.values(state.world.buildings).filter(b => b.kind === 'bed').length
    const current = Object.keys(state.world.villagers).length
    this.popText?.setText(`👥 Pop: ${current} / ${beds}  [V] manage`)
  }

  // ─── Hint ─────────────────────────────────────────────────────────────────

  private createHintText(): void {
    this.hintText = this.add.text(this.scale.width / 2, this.scale.height - 40, '', {
      fontSize: '14px', color: '#ffff88', fontFamily: 'monospace',
      backgroundColor: '#00000099', padding: { x: 10, y: 5 },
    }).setOrigin(0.5).setScrollFactor(0).setDepth(100).setVisible(false)
  }

  // ─── Toast ────────────────────────────────────────────────────────────────

  private createToast(): void {
    this.toastText = this.add.text(this.scale.width / 2, 60, '', {
      fontSize: '15px', color: '#88ff88', fontFamily: 'monospace',
      backgroundColor: '#00000099', padding: { x: 12, y: 6 },
    }).setOrigin(0.5, 0).setScrollFactor(0).setDepth(102).setAlpha(0)
  }

  showToast(msg: string): void { this.toastText.setText(msg).setAlpha(1); this.toastTimer = 2200 }

  private updateToast(delta: number): void {
    if (this.toastTimer <= 0) return
    this.toastTimer -= delta
    if (this.toastTimer <= 0) this.tweens.add({ targets: this.toastText, alpha: 0, duration: 400 })
  }

  // ─── Build Menu ───────────────────────────────────────────────────────────

  private createBuildMenu(): void {
    this.buildMenuGroup = this.add.group()
    const buildings: { kind: BuildingType; label: string; cost: string }[] = [
      { kind: 'floor',          label: 'Floor',          cost: '2 wood' },
      { kind: 'wall',           label: 'Wall',           cost: '3 wood + 1 stone' },
      { kind: 'chest',          label: 'Chest',          cost: '5 wood + 2 stone' },
      { kind: 'bed',            label: '🛏 Bed',          cost: '6 wood  (+1 villager)' },
      { kind: 'stockpile_zone', label: '📦 Stockpile',   cost: 'free  (workers deliver here)' },
    ]
    const menuX = this.scale.width / 2 - 150, menuY = this.scale.height / 2 - 140
    const bg = this.add.rectangle(menuX, menuY, 300, 280, 0x000000, 0.88).setOrigin(0,0).setScrollFactor(0).setDepth(200)
    this.buildMenuGroup.add(bg)
    this.buildMenuGroup.add(this.add.text(menuX + 150, menuY + 14, 'BUILD MENU  [B/ESC]', { fontSize: '11px', color: '#aaaaaa', fontFamily: 'monospace' }).setOrigin(0.5,0).setScrollFactor(0).setDepth(201))

    buildings.forEach((b, i) => {
      const btnY = menuY + 38 + i * 46
      const btn = this.add.rectangle(menuX + 14, btnY, 272, 38, 0x1a3a1a, 0.9).setOrigin(0,0).setScrollFactor(0).setDepth(201).setInteractive()
      btn.on('pointerover', () => btn.setFillStyle(0x2d6a4f, 0.9))
      btn.on('pointerout',  () => btn.setFillStyle(0x1a3a1a, 0.9))
      btn.on('pointerdown', () => { this.closeBuildMenu(); this.scene.get('Game').events.emit('selectBuilding', b.kind) })
      this.buildMenuGroup.add(btn)
      this.buildMenuGroup.add(this.add.text(menuX + 24, btnY + 5,  b.label, { fontSize: '13px', color: '#ffffff', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(202))
      this.buildMenuGroup.add(this.add.text(menuX + 24, btnY + 22, `Cost: ${b.cost}`, { fontSize: '10px', color: '#888888', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(202))
    })
    this.buildMenuGroup.setVisible(false)
  }

  private toggleBuildMenu(): void { this.buildMenuVisible ? this.closeBuildMenu() : this.openBuildMenu() }
  private openBuildMenu():  void { this.buildMenuVisible = true;  this.buildMenuGroup.setVisible(true);  this.scene.get('Game').events.emit('uiMenuOpen') }
  private closeBuildMenu(): void { this.buildMenuVisible = false; this.buildMenuGroup.setVisible(false); this.scene.get('Game').events.emit('uiMenuClose') }

  // ─── Villager Panel (V key) ───────────────────────────────────────────────

  private toggleVillagerPanel(): void {
    if (this.villagerPanelVisible) {
      this.closeVillagerPanel()
    } else {
      this.openVillagerPanel()
    }
  }

  private openVillagerPanel(): void {
    this.villagerPanelVisible = true
    this.buildVillagerPanel()
    this.scene.get('Game').events.emit('uiMenuOpen')
  }

  private closeVillagerPanel(): void {
    this.villagerPanelVisible = false
    this.villagerPanelGroup?.destroy(true)
    this.scene.get('Game').events.emit('uiMenuClose')
  }

  private buildVillagerPanel(): void {
    if (this.villagerPanelGroup) this.villagerPanelGroup.destroy(true)
    this.villagerPanelGroup = this.add.group()

    const state     = stateManager.getState()
    const villagers = Object.values(state.world.villagers)
    const panelW    = 420
    const rowH      = 60
    const panelH    = Math.max(100, villagers.length * rowH + 50)
    const px        = this.scale.width  / 2 - panelW / 2
    const py        = this.scale.height / 2 - panelH / 2

    const bg = this.add.rectangle(px, py, panelW, panelH, 0x0a0a0a, 0.92).setOrigin(0,0).setScrollFactor(0).setDepth(210)
    this.villagerPanelGroup.add(bg)

    this.villagerPanelGroup.add(
      this.add.text(px + panelW/2, py + 12, '👥 VILLAGERS  [V] close', { fontSize: '12px', color: '#aaaaaa', fontFamily: 'monospace' })
        .setOrigin(0.5, 0).setScrollFactor(0).setDepth(211)
    )

    if (villagers.length === 0) {
      this.villagerPanelGroup.add(
        this.add.text(px + panelW/2, py + panelH/2, 'No villagers yet.\nBuild a 🛏 Bed first!', {
          fontSize: '13px', color: '#666666', fontFamily: 'monospace', align: 'center'
        }).setOrigin(0.5).setScrollFactor(0).setDepth(211)
      )
    }

    villagers.forEach((v, i) => {
      const ry = py + 38 + i * rowH
      const gameScene = this.scene.get('Game') as any

      // Name + status
      const statusText = gameScene.villagerSystem?.getStatusText(v.id) ?? '—'
      this.villagerPanelGroup.add(
        this.add.text(px + 12, ry, `${v.name}`, { fontSize: '13px', color: '#ffffff', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(211)
      )
      this.villagerPanelGroup.add(
        this.add.text(px + 12, ry + 16, statusText, { fontSize: '10px', color: '#888888', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(211)
      )

      // Energy bar
      const eg = this.add.graphics().setScrollFactor(0).setDepth(211)
      eg.fillStyle(0x333333); eg.fillRect(px + 12, ry + 30, 80, 6)
      const col = v.energy > 60 ? 0x4CAF50 : v.energy > 30 ? 0xFF9800 : 0xF44336
      eg.fillStyle(col); eg.fillRect(px + 12, ry + 30, 80 * v.energy / 100, 6)
      this.villagerPanelGroup.add(eg)

      // Job priority buttons: chop / mine / farm
      const jobs: Array<{ key: keyof JobPriorities; label: string }> = [
        { key: 'chop', label: '🪓' }, { key: 'mine', label: '⛏' }, { key: 'farm', label: '🌾' }
      ]
      jobs.forEach((job, ji) => {
        const bx = px + 110 + ji * 100
        const pri = v.priorities[job.key]
        const label = pri === 0 ? `${job.label} OFF` : `${job.label} P${pri}`
        const btn = this.add.text(bx, ry + 6, label, {
          fontSize: '11px', color: pri === 0 ? '#555555' : '#ffffff',
          fontFamily: 'monospace', backgroundColor: pri === 0 ? '#1a1a1a' : '#1a4a1a',
          padding: { x: 6, y: 4 }
        }).setScrollFactor(0).setDepth(212).setInteractive()

        btn.on('pointerover', () => btn.setStyle({ backgroundColor: '#2d6a4f' }))
        btn.on('pointerout',  () => btn.setStyle({ backgroundColor: pri === 0 ? '#1a1a1a' : '#1a4a1a' }))
        btn.on('pointerdown', () => {
          const newPri = ((v.priorities[job.key] + 1) % 5)  // 0→1→2→3→4→0
          const newPriorities: JobPriorities = { ...v.priorities, [job.key]: newPri }
          this.scene.get('Game').events.emit('updatePriorities', v.id, newPriorities)
          this.closeVillagerPanel()
          this.openVillagerPanel()  // Rebuild to reflect change
        })
        this.villagerPanelGroup.add(btn)
      })
    })
  }

  // ─── Build mode indicator ─────────────────────────────────────────────────

  private createBuildModeIndicator(): void {
    this.buildModeText = this.add.text(10, 10, '', { fontSize: '13px', color: '#ffff00', fontFamily: 'monospace', backgroundColor: '#00000099', padding: { x: 8, y: 4 } }).setScrollFactor(0).setDepth(100).setVisible(false)
  }
  private onBuildModeChanged(active: boolean, building: BuildingType): void {
    this.inBuildMode = active
    this.buildModeText.setText(active ? `🏗  BUILD: ${building.toUpperCase()}  [RMB/ESC cancel]` : '').setVisible(active)
  }

  // ─── Farm tool indicator ──────────────────────────────────────────────────

  private createFarmToolIndicator(): void {
    this.farmToolText = this.add.text(10, 44, '', { fontSize: '13px', color: '#aaffaa', fontFamily: 'monospace', backgroundColor: '#00000099', padding: { x: 8, y: 4 } }).setScrollFactor(0).setDepth(100).setVisible(false)
  }
  private onFarmToolChanged(tool: FarmingTool, label: string): void {
    this.inFarmMode = tool !== 'none'
    this.farmToolText.setText(tool === 'none' ? '' : `[F] Farm: ${label}  [RMB cancel]`).setVisible(tool !== 'none')
  }

  // ─── Coords + controls ────────────────────────────────────────────────────

  private createCoordsDisplay(): void {
    this.coordsText = this.add.text(10, this.scale.height - 24, '', { fontSize: '11px', color: '#666666', fontFamily: 'monospace' }).setScrollFactor(0).setDepth(100)
    this.controlsHintText = this.add.text(10, this.scale.height - 42, '[WASD] Pan  [Scroll] Zoom  [F] Farm  [B] Build  [V] Villagers', {
      fontSize: '10px', color: '#444444', fontFamily: 'monospace', backgroundColor: '#00000066', padding: { x: 4, y: 2 }
    }).setScrollFactor(0).setDepth(100)
  }
  private onCameraMoved(pos: { tileX: number; tileY: number }): void {
    this.coordsText.setText(`Tile: ${pos.tileX}, ${pos.tileY}`)
  }

  // ─── Context Menu ─────────────────────────────────────────────────────────

  /**
   * Shows the right-click context menu at the given screen coordinates.
   * Any previously open context menu is closed first.
   * @param x - Screen x position of the pointer
   * @param y - Screen y position of the pointer
   */
  private showContextMenu(x: number, y: number): void {
    this.hideContextMenu()

    const menuW = 150
    const btnH  = 32
    const menuH = 8 + 2 * (btnH + 6) - 6 + 8

    const mx = Math.min(x, this.scale.width  - menuW - 4)
    const my = Math.min(y, this.scale.height - menuH - 4)

    const bg = this.add.rectangle(mx, my, menuW, menuH, 0x000000, 0.88)
      .setOrigin(0, 0).setScrollFactor(0).setDepth(300)
    this.contextMenuGroup.add(bg)

    const entries: { label: string; action: () => void }[] = [
      {
        label: '🏗  Build',
        action: () => { this.hideContextMenu(); this.scene.get('Game').events.emit('uiRequestBuildMenu') },
      },
      {
        label: '👥  Folks',
        action: () => { this.hideContextMenu(); this.toggleVillagerPanel() },
      },
    ]

    entries.forEach((entry, i) => {
      const by = my + 8 + i * (btnH + 6)
      const btn = this.add.rectangle(mx + 8, by, menuW - 16, btnH, 0x1a3a1a, 0.9)
        .setOrigin(0, 0).setScrollFactor(0).setDepth(301).setInteractive()
      btn.on('pointerover', () => btn.setFillStyle(0x2d6a4f, 0.9))
      btn.on('pointerout',  () => btn.setFillStyle(0x1a3a1a, 0.9))
      btn.on('pointerdown', entry.action)
      this.contextMenuGroup.add(btn)
      this.contextMenuGroup.add(
        this.add.text(mx + 16, by + btnH / 2, entry.label, {
          fontSize: '13px', color: '#ffffff', fontFamily: 'monospace',
        }).setOrigin(0, 0.5).setScrollFactor(0).setDepth(302)
      )
    })

    this.contextMenuVisible = true
    this.scene.get('Game').events.emit('uiMenuOpen')
  }

  /**
   * Closes and destroys the context menu if it is currently visible.
   */
  private hideContextMenu(): void {
    if (!this.contextMenuVisible) return
    this.contextMenuGroup.destroy(true)
    this.contextMenuGroup = this.add.group()
    this.contextMenuVisible = false
    this.scene.get('Game').events.emit('uiMenuClose')
  }

  // ─── Resize ───────────────────────────────────────────────────────────────

  /**
   * Repositions all fixed UI elements after a canvas resize.
   * Open overlay panels are closed so they reopen correctly centered.
   */
  private repositionUI(): void {
    const { width, height } = this.scale

    // Stockpile panel — anchored to top-right; move all elements by the delta
    const newPanelX = width - 178
    const deltaX    = newPanelX - this.stockpilePanel.x
    if (deltaX !== 0) {
      this.stockpilePanel.setX(newPanelX)
      this.stockpileTitleText.setX(this.stockpileTitleText.x + deltaX)
      this.stockpileTexts.forEach(t => t.setX(t.x + deltaX))
      this.popText.setX(this.popText.x + deltaX)
    }

    // Bottom elements
    this.hintText.setPosition(width / 2, height - 40)
    this.toastText.setPosition(width / 2, 60)
    this.coordsText.setPosition(10, height - 24)
    this.controlsHintText.setPosition(10, height - 42)

    // Close centered panels — their position is calculated on open, so they
    // would be off-center if left open during a resize
    if (this.buildMenuVisible)    this.closeBuildMenu()
    if (this.villagerPanelVisible) this.closeVillagerPanel()
    if (this.contextMenuVisible)   this.hideContextMenu()
  }
}