import { describe, it, expect } from 'vitest';
import {
    generateDeckFromInventory,
    createStatusCard,
    createDeckRegions,
    createPlayerDeck,
    generateCardId,
} from '@/samples/slay-the-spire-like/deck/factory';
import { createGridInventory, placeItem } from '@/samples/slay-the-spire-like/grid-inventory';
import type { GridInventory, InventoryItem } from '@/samples/slay-the-spire-like/grid-inventory';
import type { GameItemMeta } from '@/samples/slay-the-spire-like/progress/types';
import { IDENTITY_TRANSFORM } from '@/samples/slay-the-spire-like/utils/shape-collision';
import { parseShapeString } from '@/samples/slay-the-spire-like/utils/parse-shape';

/**
 * Helper: create a minimal GameItemMeta for testing.
 */
function createTestMeta(name: string, desc: string, shapeStr: string): GameItemMeta {
    const shape = parseShapeString(shapeStr);
    return {
        itemData: {
            type: 'weapon',
            name,
            shape: shapeStr,
            costType: 'energy',
            costCount: 1,
            targetType: 'single',
            price: 10,
            desc,
        },
        shape,
    };
}

/**
 * Helper: create a test inventory with some items.
 */
function createTestInventory(): GridInventory<GameItemMeta> {
    const inv = createGridInventory<GameItemMeta>(6, 4);

    // Item "短刀" with shape "oe" (2 cells)
    const meta1 = createTestMeta('短刀', '【攻击3】【攻击3】', 'oe');
    const item1: InventoryItem<GameItemMeta> = {
        id: 'dagger-1',
        shape: meta1.shape,
        transform: { ...IDENTITY_TRANSFORM, offset: { x: 0, y: 0 } },
        meta: meta1,
    };
    placeItem(inv, item1);

    // Item "盾" with shape "oesw" (4 cells)
    const meta2 = createTestMeta('盾', '【防御3】', 'oesw');
    const item2: InventoryItem<GameItemMeta> = {
        id: 'shield-1',
        shape: meta2.shape,
        transform: { ...IDENTITY_TRANSFORM, offset: { x: 3, y: 0 } },
        meta: meta2,
    };
    placeItem(inv, item2);

    return inv;
}

describe('deck/factory', () => {
    describe('generateCardId', () => {
        it('should generate deterministic unique IDs', () => {
            expect(generateCardId('item-1', 0)).toBe('card-item-1-0');
            expect(generateCardId('item-1', 1)).toBe('card-item-1-1');
            expect(generateCardId('item-2', 0)).toBe('card-item-2-0');
        });
    });

    describe('createStatusCard', () => {
        it('should create a card with null sourceItemId and itemData', () => {
            const card = createStatusCard('wound-1', '伤口', '无法被弃牌');

            expect(card.id).toBe('wound-1');
            expect(card.sourceItemId).toBeNull();
            expect(card.itemData).toBeNull();
            expect(card.cellKey).toBeNull();
            expect(card.displayName).toBe('伤口');
            expect(card.description).toBe('无法被弃牌');
        });

        it('should have empty region and position', () => {
            const card = createStatusCard('stun-1', '眩晕', '跳过出牌阶段');

            expect(card.regionId).toBe('');
            expect(card.position).toEqual([]);
        });
    });

    describe('generateDeckFromInventory', () => {
        it('should generate correct number of cards based on shape cell counts', () => {
            const inv = createTestInventory();

            // "短刀" has 2 cells, "盾" has 4 cells = 6 total
            const deck = generateDeckFromInventory(inv);

            expect(Object.keys(deck.cards).length).toBe(6);
            expect(deck.drawPile.length).toBe(6);
            expect(deck.hand).toEqual([]);
            expect(deck.discardPile).toEqual([]);
            expect(deck.exhaustPile).toEqual([]);
        });

        it('should link cards to their source items', () => {
            const inv = createTestInventory();
            const deck = generateDeckFromInventory(inv);

            const daggerCards = Object.values(deck.cards).filter(
                c => c.sourceItemId === 'dagger-1'
            );
            const shieldCards = Object.values(deck.cards).filter(
                c => c.sourceItemId === 'shield-1'
            );

            expect(daggerCards.length).toBe(2);
            expect(shieldCards.length).toBe(4);

            // Verify item data
            expect(daggerCards[0].itemData?.name).toBe('短刀');
            expect(shieldCards[0].itemData?.name).toBe('盾');
        });

        it('should set displayName and description from item data', () => {
            const inv = createTestInventory();
            const deck = generateDeckFromInventory(inv);

            for (const card of Object.values(deck.cards)) {
                expect(card.displayName).toBeTruthy();
                expect(card.description).toBeTruthy();
            }

            const daggerCard = Object.values(deck.cards).find(
                c => c.itemData?.name === '短刀'
            );
            expect(daggerCard?.displayName).toBe('短刀');
            expect(daggerCard?.description).toBe('【攻击3】【攻击3】');
        });

        it('should assign unique cell keys to each card from same item', () => {
            const inv = createTestInventory();
            const deck = generateDeckFromInventory(inv);

            const daggerCards = Object.values(deck.cards).filter(
                c => c.sourceItemId === 'dagger-1'
            );

            const cellKeys = daggerCards.map(c => c.cellKey);
            const uniqueKeys = new Set(cellKeys);
            expect(uniqueKeys.size).toBe(cellKeys.length);
        });

        it('should handle empty inventory', () => {
            const inv = createGridInventory<GameItemMeta>(6, 4);
            const deck = generateDeckFromInventory(inv);

            expect(Object.keys(deck.cards).length).toBe(0);
            expect(deck.drawPile).toEqual([]);
        });

        it('should place all cards in draw pile initially', () => {
            const inv = createTestInventory();
            const deck = generateDeckFromInventory(inv);

            for (const cardId of deck.drawPile) {
                expect(deck.cards[cardId]).toBeDefined();
            }

            // All cards are in draw pile
            expect(new Set(deck.drawPile).size).toBe(Object.keys(deck.cards).length);
        });
    });

    describe('createDeckRegions', () => {
        it('should create regions for all deck zones', () => {
            const regions = createDeckRegions();

            expect(regions.drawPile.id).toBe('drawPile');
            expect(regions.hand.id).toBe('hand');
            expect(regions.discardPile.id).toBe('discardPile');
            expect(regions.exhaustPile.id).toBe('exhaustPile');
        });

        it('should have empty childIds initially', () => {
            const regions = createDeckRegions();

            expect(regions.drawPile.childIds).toEqual([]);
            expect(regions.hand.childIds).toEqual([]);
            expect(regions.discardPile.childIds).toEqual([]);
            expect(regions.exhaustPile.childIds).toEqual([]);
        });
    });

    describe('createPlayerDeck', () => {
        it('should create an empty deck structure', () => {
            const deck = createPlayerDeck();

            expect(deck.cards).toEqual({});
            expect(deck.drawPile).toEqual([]);
            expect(deck.hand).toEqual([]);
            expect(deck.discardPile).toEqual([]);
            expect(deck.exhaustPile).toEqual([]);
        });
    });
});