import { describe, it, expect, vi, beforeEach } from 'vitest';

// Mock Phaser
vi.mock('phaser', () => {
    const mockGraphics = {
        setDepth: vi.fn().mockReturnThis(),
        clear: vi.fn().mockReturnThis(),
        lineStyle: vi.fn().mockReturnThis(),
        lineBetween: vi.fn().mockReturnThis(),
    };

    const mockSprite = {
        setDepth: vi.fn().mockReturnThis(),
        setVisible: vi.fn().mockReturnThis(),
        setAlpha: vi.fn().mockReturnThis(),
        setPosition: vi.fn().mockReturnThis(),
    };

    return {
        default: {
            GameObjects: {
                Sprite: vi.fn(() => mockSprite),
                Graphics: vi.fn(() => mockGraphics),
            },
            Scene: class {
                add = {
                    graphics: vi.fn(() => mockGraphics),
                    sprite: vi.fn(() => mockSprite),
                };
            }
        }
    };
});

// Mock CombatLogic
vi.mock('../../../engine/gameplay/CombatLogic', () => ({
    traceProjectile: vi.fn(),
    getClosestVisibleEnemy: vi.fn(),
}));

import { TargetingSystem } from '../TargetingSystem';
import { traceProjectile, getClosestVisibleEnemy } from '../../../engine/gameplay/CombatLogic';
import { TILE_SIZE } from '../../../core/constants';
import type { EntityId } from '../../../core/types';

describe('TargetingSystem', () => {
    let targetingSystem: TargetingSystem;
    let mockWorld: any;
    let mockScene: any;
    let mockGraphics: any;
    let mockSprite: any;

    beforeEach(() => {
        vi.clearAllMocks();

        mockGraphics = {
            setDepth: vi.fn().mockReturnThis(),
            clear: vi.fn().mockReturnThis(),
            lineStyle: vi.fn().mockReturnThis(),
            lineBetween: vi.fn().mockReturnThis(),
        };

        mockSprite = {
            setDepth: vi.fn().mockReturnThis(),
            setVisible: vi.fn().mockReturnThis(),
            setAlpha: vi.fn().mockReturnThis(),
            setPosition: vi.fn().mockReturnThis(),
        };

        mockScene = {
            add: {
                graphics: vi.fn(() => mockGraphics),
                sprite: vi.fn(() => mockSprite),
            },
        } as any;

        targetingSystem = new TargetingSystem(mockScene);
        mockWorld = { width: 10, height: 10 };

        // Default return for traceProjectile
        (traceProjectile as any).mockReturnValue({
            blockedPos: { x: 0, y: 0 },
            hitActorId: undefined,
            path: []
        });
    });

    it('should initialize with graphics and crosshair sprite hidden', () => {
        expect(mockScene.add.graphics).toHaveBeenCalled();
        expect(mockScene.add.sprite).toHaveBeenCalled();
        expect(mockSprite.setVisible).toHaveBeenCalledWith(false);
    });

    it('should start targeting and auto-select closest enemy', () => {
        const playerPos = { x: 1, y: 1 };
        const enemyPos = { x: 3, y: 3 };
        (getClosestVisibleEnemy as any).mockReturnValue(enemyPos);

        const mockAccessor = {
            getCombatant: vi.fn().mockReturnValue({
                pos: playerPos,
                inventory: { items: [{ id: 'item-1' }] }
            }),
            context: {}
        };

        targetingSystem.startTargeting(
            'item-1',
            playerPos,
            mockWorld,
            mockAccessor as any,
            1 as EntityId, // playerId
            new Uint8Array(100),
            10
        );

        expect(targetingSystem.isActive).toBe(true);
        expect(targetingSystem.itemId).toBe('item-1');
        expect(targetingSystem.cursorPos).toEqual(enemyPos);
        expect(mockSprite.setVisible).toHaveBeenCalledWith(true);
    });

    it('should fallback to mouse position if no enemy found', () => {
        const playerPos = { x: 1, y: 1 };
        const mousePos = { x: 5, y: 5 };
        (getClosestVisibleEnemy as any).mockReturnValue(null);

        const mockAccessor = {
            getCombatant: vi.fn().mockReturnValue({
                pos: playerPos,
                inventory: { items: [{ id: 'item-1' }] }
            }),
            context: {}
        };

        targetingSystem.startTargeting(
            'item-1',
            playerPos,
            mockWorld,
            mockAccessor as any,
            1 as EntityId, // playerId
            new Uint8Array(100),
            10,
            mousePos
        );

        expect(targetingSystem.cursorPos).toEqual(mousePos);
    });

    it('should update visuals with predictive impact point', () => {
        const playerPos = { x: 1, y: 1 };
        const targetPos = { x: 5, y: 1 };
        const blockedPos = { x: 3, y: 1 }; // Wall at 3,1

        (traceProjectile as any).mockReturnValue({
            blockedPos: blockedPos,
            hitActorId: undefined,
            path: []
        });

        const mockAccessor = {
            getCombatant: vi.fn().mockReturnValue({
                pos: playerPos,
                inventory: { items: [{ id: 'item-1' }] }
            }),
            context: {}
        };

        // Start targeting
        targetingSystem.startTargeting(
            'item-1',
            playerPos,
            mockWorld,
            mockAccessor as any,
            1 as EntityId,
            new Uint8Array(100),
            10,
            targetPos
        );

        // The crosshair should be at blockedPos, not targetPos
        const expectedX = blockedPos.x * TILE_SIZE + TILE_SIZE / 2;
        const expectedY = blockedPos.y * TILE_SIZE + TILE_SIZE / 2;
        expect(mockSprite.setPosition).toHaveBeenCalledWith(expectedX, expectedY);

        // Verify dashed line was drawn (multiple lineBetween calls)
        expect(mockGraphics.lineBetween).toHaveBeenCalled();
        expect(mockGraphics.lineBetween.mock.calls.length).toBeGreaterThan(1);
    });

    it('should clear visuals on cancel', () => {
        targetingSystem.cancel();
        expect(targetingSystem.isActive).toBe(false);
        expect(mockGraphics.clear).toHaveBeenCalled();
        expect(mockSprite.setVisible).toHaveBeenCalledWith(false);
    });

    it('should prevent targeting self', () => {
        const playerPos = { x: 1, y: 1 };

        // Setup targeting
        targetingSystem.startTargeting(
            'item-1',
            playerPos,
            mockWorld,
            { getCombatant: vi.fn().mockReturnValue({ pos: playerPos, inventory: { items: [{ id: 'item-1' }] } }) } as any,
            1 as EntityId,
            new Uint8Array(100),
            10
        );

        // Manually set cursor to player pos (startTargeting might do it, but we ensure it)
        targetingSystem.updateCursor(playerPos, playerPos);

        const callback = vi.fn();
        const result = targetingSystem.executeThrow(
            mockWorld,
            1 as EntityId,
            { getCombatant: vi.fn().mockReturnValue({ pos: playerPos, inventory: { items: [{ id: 'item-1' }] } }) } as any,
            callback
        );

        expect(result).toBe(false);
        expect(callback).not.toHaveBeenCalled();
    });
});