import { describe, it, expect } from "vitest";
import { createGameContext } from "@/core/game";
import { registry } from "@/samples/regicide/commands";
import { createInitialState } from "@/samples/regicide/state";
import {
  buildEnemyDeck,
  buildTavernDeck,
  createAllCards,
  createCard,
  createEnemy,
  getCardValue,
  isEnemyDefeated,
} from "@/samples/regicide/utils";
import { Mulberry32RNG } from "@/utils/rng";
import {
  CARD_VALUES,
  ENEMY_COUNT,
  FACE_CARDS,
  INITIAL_HAND_SIZE,
} from "@/samples/regicide/constants";
import { PlayerType } from "@/samples/regicide/types";

describe("Regicide - Utils", () => {
  describe("getCardValue", () => {
    it("should return correct value for number cards", () => {
      expect(getCardValue("A")).toBe(1);
      expect(getCardValue("5")).toBe(5);
      expect(getCardValue("10")).toBe(10);
    });

    it("should return correct value for face cards", () => {
      expect(getCardValue("J")).toBe(10);
      expect(getCardValue("Q")).toBe(15);
      expect(getCardValue("K")).toBe(20);
    });
  });

  describe("createCard", () => {
    it("should create a card with correct properties", () => {
      const card = createCard("spades_A", "spades", "A");
      expect(card.id).toBe("spades_A");
      expect(card.suit).toBe("spades");
      expect(card.rank).toBe("A");
      expect(card.value).toBe(1);
    });
  });

  describe("createEnemy", () => {
    it("should create an enemy with correct HP", () => {
      const enemy = createEnemy("enemy_0", "J", "spades");
      expect(enemy.rank).toBe("J");
      expect(enemy.value).toBe(10);
      expect(enemy.hp).toBe(20);
      expect(enemy.maxHp).toBe(20);
    });

    it("should create enemy with different values for different ranks", () => {
      const jEnemy = createEnemy("enemy_0", "J", "spades");
      const qEnemy = createEnemy("enemy_1", "Q", "hearts");
      const kEnemy = createEnemy("enemy_2", "K", "diamonds");

      expect(jEnemy.value).toBe(10);
      expect(qEnemy.value).toBe(15);
      expect(kEnemy.value).toBe(20);

      expect(jEnemy.hp).toBe(20);
      expect(qEnemy.hp).toBe(30);
      expect(kEnemy.hp).toBe(40);
    });
  });

  describe("createAllCards", () => {
    it("should create 52 cards", () => {
      const cards = createAllCards();
      expect(Object.keys(cards).length).toBe(52);
    });

    it("should have all suits and ranks", () => {
      const cards = createAllCards();
      const suits = ["spades", "hearts", "diamonds", "clubs"];
      const ranks = [
        "A",
        "2",
        "3",
        "4",
        "5",
        "6",
        "7",
        "8",
        "9",
        "10",
        "J",
        "Q",
        "K",
      ];

      for (const suit of suits) {
        for (const rank of ranks) {
          const id = `${suit}_${rank}`;
          expect(cards[id]).toBeDefined();
          expect(cards[id].suit).toBe(suit);
          expect(cards[id].rank).toBe(rank);
        }
      }
    });
  });

  describe("buildEnemyDeck", () => {
    it("should create 12 enemies (J/Q/K)", () => {
      const rng = new Mulberry32RNG(12345);
      const deck = buildEnemyDeck(rng);
      expect(deck.length).toBe(12);
    });

    it("should have J at top, Q in middle, K at bottom", () => {
      const rng = new Mulberry32RNG(12345);
      const deck = buildEnemyDeck(rng);

      for (let i = 0; i < 4; i++) {
        expect(deck[i].rank).toBe("J");
      }

      for (let i = 4; i < 8; i++) {
        expect(deck[i].rank).toBe("Q");
      }

      for (let i = 8; i < 12; i++) {
        expect(deck[i].rank).toBe("K");
      }
    });
  });

  describe("buildTavernDeck", () => {
    it("should create 40 cards (A-10)", () => {
      const rng = new Mulberry32RNG(12345);
      const deck = buildTavernDeck(rng);
      expect(deck.length).toBe(40);
    });

    it("should not contain face cards", () => {
      const rng = new Mulberry32RNG(12345);
      const deck = buildTavernDeck(rng);

      for (const card of deck) {
        expect(FACE_CARDS.includes(card.rank)).toBe(false);
      }
    });
  });

  describe("isEnemyDefeated", () => {
    it("should return true when enemy HP <= 0", () => {
      const enemy = createEnemy("enemy_0", "J", "spades");
      expect(isEnemyDefeated(enemy)).toBe(false);

      enemy.hp = 0;
      expect(isEnemyDefeated(enemy)).toBe(true);

      enemy.hp = -5;
      expect(isEnemyDefeated(enemy)).toBe(true);
    });

    it("should return false for null enemy", () => {
      expect(isEnemyDefeated(null)).toBe(false);
    });
  });
});

describe("Regicide - Commands", () => {
  function createTestContext() {
    const initialState = createInitialState();
    return createGameContext(registry, initialState);
  }

  function setupTestGame(game: ReturnType<typeof createTestContext>) {
    const cards = createAllCards();
    const rng = new Mulberry32RNG(12345);
    const enemyDeck = buildEnemyDeck(rng);
    const tavernDeck = buildTavernDeck(rng);

    game.produce((state) => {
      state.cards = cards;
      state.playerCount = 2;
      state.currentPlayerIndex = 0;
      state.enemyDeck = [...enemyDeck];
      state.currentEnemy = { ...enemyDeck[0] };

      for (const card of tavernDeck) {
        state.regions.tavernDeck.childIds.push(card.id);
      }

      for (let i = 0; i < 6; i++) {
        const card1 = tavernDeck[i];
        const card2 = tavernDeck[i + 6];
        card1.regionId = "hand_player1";
        card2.regionId = "hand_player2";
        state.playerHands.player1.push(card1.id);
        state.playerHands.player2.push(card2.id);
        state.regions.hand_player1.childIds.push(card1.id);
        state.regions.hand_player2.childIds.push(card2.id);
      }
    });
  }

  describe("play command", () => {
    it("should deal damage to current enemy", async () => {
      const game = createTestContext();
      setupTestGame(game);

      const enemyHpBefore = game.value.currentEnemy!.hp;
      const cardId = game.value.playerHands.player1[0];
      const card = game.value.cards[cardId];

      const result = await game.run(`play player1 ${cardId}`);

      expect(game.value.currentEnemy!.hp).toBe(enemyHpBefore - card.value);
    });

    it("should double damage for clubs suit", async () => {
      const game = createTestContext();
      setupTestGame(game);

      game.produce((state) => {
        state.cards["clubs_5"] = createCard("clubs_5", "clubs", "5");
        state.playerHands.player1.push("clubs_5");
        state.regions.hand_player1.childIds.push("clubs_5");
      });

      const clubsCardId = "clubs_5";
      const enemyHpBefore = game.value.currentEnemy!.hp;
      const card = game.value.cards[clubsCardId];

      await game.run(`play player1 ${clubsCardId}`);

      expect(game.value.currentEnemy!.hp).toBe(enemyHpBefore - card.value * 2);
    });
  });

  describe("pass command", () => {
    it("should allow player to pass", async () => {
      const game = createTestContext();
      setupTestGame(game);

      const result = await game.run("pass player1");

      expect(result.success).toBe(true);
    });
  });

  describe("check-enemy command", () => {
    it("should detect defeated enemy and reveal next", async () => {
      const game = createTestContext();
      setupTestGame(game);

      const firstEnemy = game.value.currentEnemy!;
      game.produce((state) => {
        state.currentEnemy!.hp = 0;
      });

      await game.run("check-enemy");

      expect(game.value.regions.discardPile.childIds).toContain(firstEnemy.id);
      expect(game.value.currentEnemy).not.toBe(firstEnemy);
    });

    it("should not defeat enemy if HP > 0", async () => {
      const game = createTestContext();
      setupTestGame(game);

      const currentEnemyId = game.value.currentEnemy!.id;

      await game.run("check-enemy");

      expect(game.value.currentEnemy!.id).toBe(currentEnemyId);
    });
  });

  describe("next-turn command", () => {
    it("should switch to next player", async () => {
      const game = createTestContext();
      setupTestGame(game);

      expect(game.value.currentPlayerIndex).toBe(0);

      await game.run("next-turn");

      expect(game.value.currentPlayerIndex).toBe(1);
    });

    it("should wrap around to first player", async () => {
      const game = createTestContext();
      setupTestGame(game);

      game.produce((state) => {
        state.currentPlayerIndex = 1;
      });

      await game.run("next-turn");

      expect(game.value.currentPlayerIndex).toBe(0);
    });
  });
});

describe("Regicide - Game Flow", () => {
  function createTestContext() {
    const initialState = createInitialState();
    return createGameContext(registry, initialState);
  }

  it("should complete a full turn cycle", async () => {
    const game = createTestContext();

    const cards = createAllCards();
    const rng = new Mulberry32RNG(12345);
    const enemyDeck = buildEnemyDeck(rng);
    const tavernDeck = buildTavernDeck(rng);

    game.produce((state) => {
      state.cards = cards;
      state.playerCount = 1;
      state.currentPlayerIndex = 0;
      state.enemyDeck = [...enemyDeck.slice(1)];
      state.currentEnemy = { ...enemyDeck[0] };

      for (const card of tavernDeck) {
        state.regions.tavernDeck.childIds.push(card.id);
      }

      for (let i = 0; i < 6; i++) {
        const card = tavernDeck[i];
        card.regionId = "hand_player1";
        state.playerHands.player1.push(card.id);
        state.regions.hand_player1.childIds.push(card.id);
      }
    });

    const cardId = game.value.playerHands.player1[0];
    const card = game.value.cards[cardId];
    const enemyHpBefore = game.value.currentEnemy!.hp;

    await game.run(`play player1 ${cardId}`);

    expect(game.value.currentEnemy!.hp).toBeLessThan(enemyHpBefore);
  });

  it("should win game when all enemies defeated", async () => {
    const game = createTestContext();

    const cards = createAllCards();
    const rng = new Mulberry32RNG(12345);
    const tavernDeck = buildTavernDeck(rng);

    game.produce((state) => {
      state.cards = cards;
      state.playerCount = 1;
      state.currentPlayerIndex = 0;
      state.enemyDeck = [];
      state.currentEnemy = null;

      for (const card of tavernDeck) {
        state.regions.tavernDeck.childIds.push(card.id);
      }
    });

    game.produce((state) => {
      state.phase = "victory";
      state.winner = true;
    });

    expect(game.value.phase).toBe("victory");
    expect(game.value.winner).toBe(true);
  });
});