import Phaser from "phaser";
import { GameHostScene } from "boardgame-phaser";
import { spawnEffect, type Spawner } from "boardgame-phaser";
import {
  CombatResult,
  type CombatState,
  prompts,
} from "boardgame-core/samples/slay-the-spire-like";
import { createButton } from "@/utils/createButton";
import { SceneKey } from "./types";
import {
  CombatUnitContainer,
  type CombatUnitData,
} from "@/gameobjects/CombatUnitContainer";
import { CardSpawner } from "@/gameobjects/CardSpawner";
import { CombatModule } from "@/state/combatState";

const CARD_SPACING = 160;
const HAND_MARGIN = 100;
const HAND_Y = 140;

export class CombatTestScene extends GameHostScene<
  CombatState,
  CombatResult | null,
  CombatModule
> {
  private selectedCardId: string | null = null;
  private isTargeting = false;
  private targetingText!: Phaser.GameObjects.Text;
  private selectionRect!: Phaser.GameObjects.Rectangle;

  constructor() {
    super("CombatTestScene");
  }

  create(): void {
    super.create();

    const { width, height } = this.scale;

    // Title
    this.add
      .text(width / 2, 30, "Combat Test — Card Play", {
        fontSize: "24px",
        color: "#ffffff",
        fontStyle: "bold",
      })
      .setOrigin(0.5);

    // Info text (reactive)
    const infoText = this.add
      .text(width / 2, 60, "", {
        fontSize: "14px",
        color: "#aaaaaa",
      })
      .setOrigin(0.5);

    this.addEffect(() => {
      const s = this.state;
      infoText.setText(
        `Turn ${s.turnNumber} | Phase: ${s.phase} | Energy: ${s.player.energy}/${s.player.maxEnergy}`,
      );
    });

    // Targeting indicator
    this.targetingText = this.add
      .text(width / 2, height - 220, "", {
        fontSize: "18px",
        color: "#fbbf24",
        fontStyle: "bold",
      })
      .setOrigin(0.5)
      .setAlpha(0);

    // Selection rectangle overlay for selected card
    this.selectionRect = this.add
      .rectangle(0, 0, 150, 210, 0x000000, 0)
      .setStrokeStyle(4, 0xfbbf24)
      .setAlpha(0)
      .setDepth(50);

    // Unit spawner (player + enemies)
    this.disposables.add(spawnEffect(new UnitSpawner(this)));

    // Card spawner (hand)
    this.disposables.add(
      spawnEffect(
        new CardSpawner(
          this,
          () => this.state,
          (cardId) => this.onCardClick(cardId),
        ),
      ),
    );

    // Watch hand changes to clear stale selection
    this.addEffect(() => {
      const handIds = this.state.player.deck.regions.hand.childIds;
      if (this.selectedCardId && !handIds.includes(this.selectedCardId)) {
        this.clearTargeting();
      } else {
        this.updateSelectionRect();
      }
    });

    // Controls
    createButton({
      scene: this,
      label: "返回菜单",
      x: 100,
      y: 40,
      onClick: async () => {
        await this.sceneController.launch(SceneKey.IndexScene);
      },
    });

    createButton({
      scene: this,
      label: "End Turn",
      x: width - 100,
      y: 40,
      onClick: () => {
        this.tryPlayCard("end-turn");
      },
    });

    // Start the game loop
    this.gameHost.start();
  }

  private onCardClick(cardId: string): void {
    const state = this.state;
    const card = state.player.deck.cards[cardId];
    if (!card) return;

    const targetType = card.cardData.targetType;

    if (targetType === "enemy") {
      this.selectedCardId = cardId;
      this.isTargeting = true;
      this.targetingText.setText("Select a target!");
      this.targetingText.setAlpha(1);
      this.updateSelectionRect();
    } else {
      this.tryPlayCard(cardId);
    }
  }

  public onEnemyClick(enemyId: string): void {
    if (!this.isTargeting || !this.selectedCardId) return;
    this.tryPlayCard(this.selectedCardId, enemyId);
  }

  public getIsTargeting(): boolean {
    return this.isTargeting;
  }

  private tryPlayCard(cardId: string, targetId?: string): void {
    const error = this.gameHost.prompts.tryCommit(
      prompts.mainAction,
      "player",
      cardId,
      targetId,
    );
    if (error) {
      console.warn("Play failed:", error);
    }
    this.clearTargeting();
  }

  private clearTargeting(): void {
    this.selectedCardId = null;
    this.isTargeting = false;
    this.targetingText.setAlpha(0);
    this.selectionRect.setAlpha(0);
  }

  private updateSelectionRect(): void {
    if (!this.selectedCardId) {
      this.selectionRect.setAlpha(0);
      return;
    }

    const state = this.state;
    const handIds = state.player.deck.regions.hand.childIds;
    const index = handIds.indexOf(this.selectedCardId);
    if (index === -1) {
      this.selectionRect.setAlpha(0);
      return;
    }

    const { width, height } = this.scale;
    const total = handIds.length;
    const spacing = Math.min(
      CARD_SPACING,
      (width - HAND_MARGIN * 2) / Math.max(1, total),
    );
    const startX = width / 2 - ((total - 1) * spacing) / 2;
    const x = startX + index * spacing;
    const y = height - HAND_Y;

    this.selectionRect.setPosition(x, y);
    this.selectionRect.setAlpha(1);
  }
}

class UnitSpawner implements Spawner<CombatUnitData, CombatUnitContainer> {
  constructor(private scene: CombatTestScene) {}

  *getData(): Iterable<CombatUnitData> {
    const state = this.scene.state;
    yield {
      key: "player",
      entity: state.player,
      name: "Player",
      isPlayer: true,
    };
    for (let i = 0; i < state.enemies.length; i++) {
      const enemy = state.enemies[i];
      yield {
        key: `enemy-${i}`,
        entity: enemy,
        name: enemy.enemy.name,
        isPlayer: false,
      };
    }
  }

  getKey(t: CombatUnitData): string {
    return t.key;
  }

  onSpawn(t: CombatUnitData): CombatUnitContainer {
    const { width, height } = this.scene.scale;
    const state = this.scene.state;
    const totalUnits = 1 + state.enemies.length;
    const spacing = 220;
    const totalWidth = (totalUnits - 1) * spacing;
    const startX = width / 2 - totalWidth / 2;

    let x = startX;
    if (t.key.startsWith("enemy-")) {
      const index = parseInt(t.key.replace("enemy-", ""), 10);
      x = startX + (index + 1) * spacing;
    }

    const container = new CombatUnitContainer(
      this.scene,
      x,
      height / 2 - 80,
      t,
    );
    container.playSpawnEffect();

    // Make enemies clickable when targeting
    if (!t.isPlayer) {
      const hitArea = new Phaser.Geom.Rectangle(-100, -130, 200, 260);
      container.setInteractive(hitArea, Phaser.Geom.Rectangle.Contains);
      if (container.input) {
        container.input.cursor = "pointer";
      }
      container.on("pointerdown", () => {
        if (this.scene.getIsTargeting()) {
          this.scene.onEnemyClick(t.entity.id);
        }
      });
    }

    return container;
  }

  onUpdate(t: CombatUnitData, obj: CombatUnitContainer): void {
    obj.updateFromData(t);
  }

  onDespawn(obj: CombatUnitContainer): void {
    obj.destroy();
  }
}