import { describe, it, expect, beforeEach } from 'vitest';
import { 
    registry, 
    createInitialState, 
    OnitamaState,
    createPawns,
    createCards,
    createRegions,
    PlayerType,
} from '@/samples/onitama';
import { createGameContext } from '@/core/game';
import type { PromptEvent } from '@/utils/command';

function createTestContext() {
    const ctx = createGameContext(registry, createInitialState());
    return { registry, ctx };
}

function createDeterministicContext() {
    // Create a state with known card distribution for testing
    const regions = createRegions();
    const pawns = createPawns();
    const cards = createCards();
    
    // Populate board region
    for(const pawn of Object.values(pawns)){
        if(pawn.regionId === 'board'){
            regions.board.childIds.push(pawn.id);
            regions.board.partMap[pawn.position.join(',')] = pawn.id;
        }
    }
    
    // Force known card distribution
    const redCards = ['tiger', 'dragon'];
    const blackCards = ['frog', 'rabbit'];
    const spareCard = 'crab';
    
    // Set card regions
    cards['tiger'].regionId = 'red';
    cards['dragon'].regionId = 'red';
    cards['frog'].regionId = 'black';
    cards['rabbit'].regionId = 'black';
    cards['crab'].regionId = 'spare';
    
    regions.red.childIds = [...redCards];
    regions.black.childIds = [...blackCards];
    regions.spare.childIds = [spareCard];
    
    const state = {
        regions,
        pawns,
        cards,
        currentPlayer: 'red' as PlayerType,
        winner: null as PlayerType | null,
        spareCard,
        redCards,
        blackCards,
        turn: 0,
    };
    
    const ctx = createGameContext(registry, () => state);
    return { registry, ctx };
}

function waitForPrompt(ctx: ReturnType<typeof createTestContext>['ctx']): Promise<PromptEvent> {
    return new Promise(resolve => {
        ctx._commands.on('prompt', resolve);
    });
}

describe('Onitama Game', () => {
    describe('Setup', () => {
        it('should create initial state correctly', () => {
            const state = createInitialState();

            expect(state.currentPlayer).toBeDefined();
            expect(state.winner).toBeNull();
            expect(state.regions.board).toBeDefined();
            expect(state.regions.red).toBeDefined();
            expect(state.regions.black).toBeDefined();
            expect(state.regions.spare).toBeDefined();

            // Should have 10 pawns (5 per player)
            const redPawns = Object.values(state.pawns).filter(p => p.owner === 'red');
            const blackPawns = Object.values(state.pawns).filter(p => p.owner === 'black');
            expect(redPawns.length).toBe(5);
            expect(blackPawns.length).toBe(5);

            // Each player should have 1 master and 4 students
            const redMaster = redPawns.find(p => p.type === 'master');
            const redStudents = redPawns.filter(p => p.type === 'student');
            expect(redMaster).toBeDefined();
            expect(redStudents.length).toBe(4);

            // Master should be at center
            expect(redMaster?.position[0]).toBe(2);
            expect(redMaster?.position[1]).toBe(0);

            // Cards should be distributed: 2 per player + 1 spare
            expect(state.redCards.length).toBe(2);
            expect(state.blackCards.length).toBe(2);
            expect(state.spareCard).toBeDefined();
        });

        it('should create pawns in correct positions', () => {
            const pawns = createPawns();

            // Red player at y=0
            expect(pawns['red-master'].position).toEqual([2, 0]);
            expect(pawns['red-student-1'].position).toEqual([0, 0]);
            expect(pawns['red-student-2'].position).toEqual([1, 0]);
            expect(pawns['red-student-3'].position).toEqual([3, 0]);
            expect(pawns['red-student-4'].position).toEqual([4, 0]);

            // Black player at y=4
            expect(pawns['black-master'].position).toEqual([2, 4]);
            expect(pawns['black-student-1'].position).toEqual([0, 4]);
            expect(pawns['black-student-2'].position).toEqual([1, 4]);
            expect(pawns['black-student-3'].position).toEqual([3, 4]);
            expect(pawns['black-student-4'].position).toEqual([4, 4]);
        });

        it('should parse cards correctly from CSV', () => {
            const cards = createCards();

            // Should have 16 unique cards
            expect(Object.keys(cards).length).toBe(16);

            // Check tiger card moves
            const tiger = cards['tiger'];
            expect(tiger.moveCandidates).toHaveLength(2);
            expect(tiger.moveCandidates).toContainEqual({ dx: 0, dy: 2 });
            expect(tiger.moveCandidates).toContainEqual({ dx: 0, dy: -1 });
            expect(tiger.startingPlayer).toBe('black');

            // Check dragon card moves
            const dragon = cards['dragon'];
            expect(dragon.moveCandidates.length).toBe(4);
            expect(dragon.startingPlayer).toBe('red');
        });

        it('should create regions correctly', () => {
            const regions = createRegions();

            expect(regions.board.id).toBe('board');
            expect(regions.board.axes).toHaveLength(2);
            expect(regions.board.axes[0].max).toBe(4);
            expect(regions.board.axes[1].max).toBe(4);
        });
    });

    describe('Move Validation', () => {
        it('should validate card ownership', async () => {
            const { ctx } = createDeterministicContext();

            // Red tries to use a card they don't have
            const result = await ctx.run('move red frog 2 0 2 1');
            expect(result.success).toBe(false);
            if (!result.success) {
                expect(result.error).toContain('不拥有卡牌');
            }
        });

        it('should validate pawn ownership', async () => {
            const { ctx } = createDeterministicContext();

            // Red tries to move a black pawn (at 2,4)
            const result = await ctx.run('move red tiger 2 4 2 2');
            expect(result.success).toBe(false);
            if (!result.success) {
                expect(result.error).toContain('不属于玩家');
            }
        });

        it('should validate move is in card pattern', async () => {
            const { ctx } = createDeterministicContext();

            // Tiger card only allows specific moves, try invalid move
            const result = await ctx.run('move red tiger 2 0 3 0');
            expect(result.success).toBe(false);
            if (!result.success) {
                expect(result.error).toContain('不支持移动');
            }
        });

        it('should prevent moving to position with own pawn', async () => {
            const { ctx } = createDeterministicContext();

            // Tiger allows dy=-2 or dy=1. Try to move to position with own pawn
            // Move student from 1,0 to 0,0 (occupied by another red student)
            // This requires dx=-1, dy=0 which tiger doesn't support
            const result = await ctx.run('move red tiger 1 0 0 0');
            expect(result.success).toBe(false);
            if (!result.success) {
                expect(result.error).toContain('不支持移动');
            }
        });
    });

    describe('Move Execution', () => {
        it('should move pawn correctly', async () => {
            const { ctx } = createDeterministicContext();

            // Move red student from 0,0 using tiger card (tiger allows dy=2)
            // From y=0, dy=2 goes to y=2
            const result = await ctx.run('move red tiger 0 0 0 2');
            expect(result.success).toBe(true);

            const state = ctx.value;
            const pawn = state.pawns['red-student-1'];
            expect(pawn.position).toEqual([0, 2]);
        });

        it('should capture enemy pawn', async () => {
            const { ctx } = createDeterministicContext();

            // Setup: place black student at 0,2
            ctx.produce(state => {
                const blackStudent = state.pawns['black-student-1'];
                blackStudent.position = [0, 2];
                state.regions.board.partMap['0,2'] = blackStudent.id;
            });

            // Red captures with tiger card
            const result = await ctx.run('move red tiger 0 0 0 2');
            expect(result.success).toBe(true);

            const state = ctx.value;
            // Black student should be removed from board
            const blackStudent = state.pawns['black-student-1'];
            expect(blackStudent.regionId).not.toBe('board');
            
            // Red student should be at 0,2
            const redStudent = state.pawns['red-student-1'];
            expect(redStudent.position).toEqual([0, 2]);
        });

        it('should swap card after move', async () => {
            const { ctx } = createDeterministicContext();

            const cardsBefore = ctx.value;
            expect(cardsBefore.redCards).toContain('tiger');
            expect(cardsBefore.spareCard).toBe('crab');

            // Move using tiger card
            await ctx.run('move red tiger 0 0 0 2');

            const state = ctx.value;
            // Tiger should now be spare, crab should be with red
            expect(state.redCards).toContain('crab');
            expect(state.redCards).not.toContain('tiger');
            expect(state.spareCard).toBe('tiger');
        });
    });

    describe('Win Conditions', () => {
        it('should detect conquest win for red (master reaches y=4)', async () => {
            const { ctx } = createDeterministicContext();

            // Move red master to y=4
            ctx.produce(state => {
                const redMaster = state.pawns['red-master'];
                redMaster.position = [2, 4];
            });

            const result = await ctx.run('check-win');
            expect(result.success).toBe(true);
            if (result.success) {
                expect(result.result).toBe('red');
            }
        });

        it('should detect conquest win for black (master reaches y=0)', async () => {
            const { ctx } = createDeterministicContext();

            // Move black master to y=0
            ctx.produce(state => {
                const blackMaster = state.pawns['black-master'];
                blackMaster.position = [2, 0];
            });

            const result = await ctx.run('check-win');
            expect(result.success).toBe(true);
            if (result.success) {
                expect(result.result).toBe('black');
            }
        });

        it('should detect capture win when red master is captured', async () => {
            const { ctx } = createDeterministicContext();

            // Remove red master from board
            ctx.produce(state => {
                const redMaster = state.pawns['red-master'];
                redMaster.regionId = '';
                delete state.regions.board.partMap['2,0'];
            });

            const result = await ctx.run('check-win');
            expect(result.success).toBe(true);
            if (result.success) {
                expect(result.result).toBe('black');
            }
        });

        it('should detect capture win when black master is captured', async () => {
            const { ctx } = createDeterministicContext();

            // Remove black master from board
            ctx.produce(state => {
                const blackMaster = state.pawns['black-master'];
                blackMaster.regionId = '';
                delete state.regions.board.partMap['2,4'];
            });

            const result = await ctx.run('check-win');
            expect(result.success).toBe(true);
            if (result.success) {
                expect(result.result).toBe('red');
            }
        });
    });

    describe('Card Swap', () => {
        it('should swap card between player and spare', async () => {
            const { ctx } = createDeterministicContext();

            const stateBefore = ctx.value;
            expect(stateBefore.redCards).toContain('tiger');
            expect(stateBefore.spareCard).toBe('crab');

            const result = await ctx.run('swap-card red tiger');
            expect(result.success).toBe(true);

            const state = ctx.value;
            expect(state.redCards).toContain('crab');
            expect(state.redCards).not.toContain('tiger');
            expect(state.spareCard).toBe('tiger');
        });
    });

    describe('Turn Flow', () => {
        it('should switch player after turn', async () => {
            const { ctx } = createDeterministicContext();

            // Force red to be current player
            ctx.produce(state => {
                state.currentPlayer = 'red';
            });

            // Start turn
            const promptPromise = waitForPrompt(ctx);
            const runPromise = ctx.run('turn red');
            const promptEvent = await promptPromise;

            // Make a valid move - tiger allows dy=2, move student from 0,0 to 0,2
            const error = promptEvent.tryCommit({
                name: 'move',
                params: ['red', 'tiger', 0, 0, 0, 2],
                options: {},
                flags: {}
            });
            expect(error).toBeNull();

            const result = await runPromise;
            expect(result.success).toBe(true);

            const state = ctx.value;
            // Should now be black's turn
            expect(state.currentPlayer).toBe('black');
            expect(state.turn).toBe(1);
        });

        it('should end game when win condition met', async () => {
            const { ctx } = createDeterministicContext();

            // Set up winning scenario - move red master to y=2, one step from winning
            ctx.produce(state => {
                state.currentPlayer = 'red';
                const redMaster = state.pawns['red-master'];
                // Clear old position
                delete state.regions.board.partMap['2,0'];
                // Set new position
                redMaster.position = [2, 2];
                state.regions.board.partMap['2,2'] = redMaster.id;
            });

            // Red moves master to winning position (y=4)
            // Tiger allows dy=2
            const promptPromise = waitForPrompt(ctx);
            const runPromise = ctx.run('turn red');
            const promptEvent = await promptPromise;

            const error = promptEvent.tryCommit({
                name: 'move',
                params: ['red', 'tiger', 2, 2, 2, 4],
                options: {},
                flags: {}
            });
            expect(error).toBeNull();

            const result = await runPromise;
            expect(result.success).toBe(true);

            const state = ctx.value;
            expect(state.winner).toBe('red');
        });
    });

    describe('Available Moves', () => {
        it('should calculate valid moves for player', async () => {
            const { ctx } = createDeterministicContext();

            // Give red cards and verify they can make moves
            ctx.produce(state => {
                state.redCards = ['tiger', 'dragon'];
            });

            // Tiger from 0,0 can go to 0,2 (dy=2)
            // Just verify the move is valid without triggering prompt
            const result = await ctx.run('move red tiger 0 0 0 2');
            expect(result.success).toBe(true);
        });
    });

    describe('No Available Moves', () => {
        it('should allow card swap when no moves available', async () => {
            const { ctx } = createDeterministicContext();

            // Setup a scenario where red has no valid moves
            // Move all red pawns to positions where they can't move with available cards
            ctx.produce(state => {
                // Move all red students to back rank or blocked positions
                for (let i = 1; i <= 4; i++) {
                    const student = state.pawns[`red-student-${i}`];
                    student.position = [i === 5 ? 4 : i - 1, 1]; // All at y=1
                }
                state.pawns['red-master'].position = [2, 1];
                
                // Give only cards that move backwards (negative dy)
                state.redCards = ['tiger'];
            });

            const promptPromise = waitForPrompt(ctx);
            const runPromise = ctx.run('turn red');
            const promptEvent = await promptPromise;

            // Should prompt for card swap
            expect(promptEvent).toBeDefined();
        });
    });

    describe('Edge Cases', () => {
        it('should handle capturing master ending the game', async () => {
            const { ctx } = createDeterministicContext();

            // Setup: black student adjacent to red master
            ctx.produce(state => {
                state.currentPlayer = 'black';
                // Move red master to 1,3
                const redMaster = state.pawns['red-master'];
                delete state.regions.board.partMap['2,0'];
                redMaster.position = [1, 3];
                state.regions.board.partMap['1,3'] = redMaster.id;

                // Move black student to 2,4
                const blackStudent = state.pawns['black-student-1'];
                delete state.regions.board.partMap['0,4'];
                blackStudent.position = [2, 4];
                state.regions.board.partMap['2,4'] = blackStudent.id;

                // Set black's card to goose
                state.blackCards = ['goose'];
                state.regions.black.childIds = ['goose'];
                state.cards['goose'].regionId = 'black';
            });

            const promptPromise = waitForPrompt(ctx);
            const runPromise = ctx.run('turn black');
            const promptEvent = await promptPromise;

            // Goose: dx=-1,dy=1; dx=-1,dy=0; dx=1,dy=0; dx=1,dy=-1
            // Move from 2,4 to 1,3 (dx=-1, dy=-1) - but goose doesn't support this!
            // Move from 2,4 to 3,3 (dx=1, dy=-1) - this matches goose's pattern
            // So let's move red master to 3,3 instead
            ctx.produce(state => {
                const redMaster = state.pawns['red-master'];
                delete state.regions.board.partMap['1,3'];
                redMaster.position = [3, 3];
                state.regions.board.partMap['3,3'] = redMaster.id;
            });

            // Now move from 2,4 to 3,3 (dx=1, dy=-1) - captures red master
            const error = promptEvent.tryCommit({
                name: 'move',
                params: ['black', 'goose', 2, 4, 3, 3],
                options: {},
                flags: {}
            });
            expect(error).toBeNull();

            const result = await runPromise;
            expect(result.success).toBe(true);

            const state = ctx.value;
            // Red master should be removed from board
            const redMaster = state.pawns['red-master'];
            expect(redMaster.regionId).not.toBe('board');
            expect(state.winner).toBe('black');
        });
    });
});