import HarvesterHandler from '@/roleHandlers/harvester.handler';
import * as getById from '@/utils/funcs/getById';
import {
    PositionSpotStatus,
    createSourcePositionMatrix,
} from '@/utils/positions';
import '~/tests/__mocks__/screeps';

describe('HarvesterHandler', () => {
    type FixtureOptions = {
        memory?: Partial<CreepMemory>;
        storeUsed?: number;
        storeCapacity?: number;
        stateOverrides?: Partial<GameState>;
        sourceId?: string;
        spawnId?: string;
    };

    const createFixture = ({
        memory = {},
        storeUsed = 0,
        storeCapacity = 50,
        stateOverrides = {},
        sourceId = 'src1',
        spawnId = 'spawn1',
    }: FixtureOptions = {}) => {
        const state = {
            sourcesStates: {
                [sourceId]: {
                    spots: createSourcePositionMatrix(
                        PositionSpotStatus.EMPTY as any
                    ),
                },
            },
            ...stateOverrides,
        } as unknown as GameState;

        const source = {
            id: sourceId,
            pos: new (global as any).RoomPosition(5, 5, 'W1N1'),
        } as unknown as Source;

        const spawn = { id: spawnId } as unknown as StructureSpawn;

        const creep = {
            name: 'Creep1',
            memory: {
                role: 'harvester',
                spawnId,
                ...memory,
            } as CreepMemory,
            store: {
                getFreeCapacity: (_res: string) => storeCapacity - storeUsed,
                getUsedCapacity: (_res: string) => storeUsed,
            },
            pos: new (global as any).RoomPosition(0, 0, 'W1N1'),
            room: {},
            harvest: jest.fn().mockReturnValue((global as any).OK),
            moveTo: jest.fn().mockReturnValue((global as any).OK),
            transfer: jest.fn().mockReturnValue((global as any).OK),
        } as unknown as Creep;

        return {
            state,
            source,
            spawn,
            creep,
            memory: creep.memory,
            mockSource: (value: Source | null = source) =>
                jest.spyOn(getById, 'getSourceById').mockReturnValue(value),
            mockSpawn: (value: StructureSpawn | null = spawn) =>
                jest.spyOn(getById, 'getSpawnById').mockReturnValue(value),
        };
    };

    beforeEach(() => {
        jest.clearAllMocks();
        jest.spyOn(console, 'log').mockImplementation(() => {});
    });

    afterEach(() => {
        jest.restoreAllMocks();
    });

    describe('destroy', () => {
        it('releases the source spot from destination and clears it', () => {
            const { state, memory } = createFixture({
                memory: {
                    destination: { type: 'source', id: 'src1', sourceSpot: 0 },
                },
            });
            state.sourcesStates['src1'].spots[0] = PositionSpotStatus.OCCUPIED;

            HarvesterHandler.destroy(memory, state);

            expect(state.sourcesStates['src1'].spots[0]).toBe(
                PositionSpotStatus.EMPTY
            );
            expect(memory.destination).toBeUndefined();
        });

        it('releases the source spot from previousDestination and clears it', () => {
            const { state, memory } = createFixture({
                memory: {
                    previousDestination: {
                        type: 'source',
                        id: 'src1',
                        sourceSpot: 2,
                    },
                },
            });
            state.sourcesStates['src1'].spots[2] = PositionSpotStatus.OCCUPIED;

            HarvesterHandler.destroy(memory, state);

            expect(state.sourcesStates['src1'].spots[2]).toBe(
                PositionSpotStatus.EMPTY
            );
            expect(memory.previousDestination).toBeUndefined();
        });

        it('does nothing when destination is not a source', () => {
            const { state, memory } = createFixture({
                memory: {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
            });

            HarvesterHandler.destroy(memory, state);

            expect(
                state.sourcesStates['src1'].spots.every(
                    (s: PositionSpotStatus) =>
                        s === PositionSpotStatus.EMPTY ||
                        s === PositionSpotStatus.CENTER
                )
            ).toBe(true);
        });

        it('does nothing when memory has no destination', () => {
            const { state, memory } = createFixture();

            expect(() => HarvesterHandler.destroy(memory, state)).not.toThrow();
        });
    });

    describe('validateCreepMemory (via run)', () => {
        it('releases previousDestination source spot and deletes it', () => {
            const { state, creep, mockSource } = createFixture({
                memory: {
                    previousDestination: {
                        type: 'source',
                        id: 'src1',
                        sourceSpot: 1,
                    },
                },
            });
            state.sourcesStates['src1'].spots[1] = PositionSpotStatus.OCCUPIED;
            mockSource(null);

            HarvesterHandler.run(creep, state);

            expect(state.sourcesStates['src1'].spots[1]).toBe(
                PositionSpotStatus.EMPTY
            );
            expect(creep.memory.previousDestination).toBeUndefined();
        });

        it('transitions from source to spawn destination when energy is full', () => {
            const { state, creep, mockSource, mockSpawn } = createFixture({
                memory: {
                    destination: { type: 'source', id: 'src1', sourceSpot: 0 },
                    spawnId: 'spawn1',
                },
                storeUsed: 50,
                storeCapacity: 50,
            });
            mockSource();
            mockSpawn();

            HarvesterHandler.run(creep, state);

            expect(creep.memory.destination?.type).toBe('spawn');
            expect(creep.memory.previousDestination?.type).toBe('source');
        });

        it('clears spawn destination when energy is empty', () => {
            const { state, creep, mockSpawn } = createFixture({
                memory: {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
                storeUsed: 0,
                storeCapacity: 50,
            });
            mockSpawn();

            HarvesterHandler.run(creep, state);

            expect(creep.memory.destination).toBeUndefined();
        });
    });

    describe('onFindNewSource', () => {
        it('assigns the first available source spot to the creep', () => {
            const { state, creep, mockSource } = createFixture();
            mockSource();

            HarvesterHandler.run(creep, state);

            expect(creep.memory.destination?.type).toBe('source');
            expect((creep.memory.destination as any).id).toBe('src1');
        });

        it('does not assign a source when all spots are occupied', () => {
            const { state, creep, mockSource } = createFixture();
            state.sourcesStates['src1'].spots = state.sourcesStates[
                'src1'
            ].spots.map((s: PositionSpotStatus) =>
                s === PositionSpotStatus.CENTER ? s : PositionSpotStatus.OCCUPIED
            ) as any;
            mockSource();

            HarvesterHandler.run(creep, state);

            expect(creep.memory.destination).toBeUndefined();
        });
    });

    describe('onSourceDestination', () => {
        it('harvests when in range', () => {
            const { state, source, creep, mockSource } = createFixture({
                memory: {
                    destination: { type: 'source', id: 'src1', sourceSpot: 0 },
                },
            });
            mockSource();
            (creep.harvest as jest.Mock).mockReturnValue((global as any).OK);

            HarvesterHandler.run(creep, state);

            expect(creep.harvest).toHaveBeenCalledWith(source);
            expect(creep.moveTo).not.toHaveBeenCalled();
        });

        it('moves to source when not in range', () => {
            const { state, creep, mockSource } = createFixture({
                memory: {
                    destination: { type: 'source', id: 'src1', sourceSpot: 0 },
                },
            });
            mockSource();
            (creep.harvest as jest.Mock).mockReturnValue(
                (global as any).ERR_NOT_IN_RANGE
            );

            HarvesterHandler.run(creep, state);

            expect(creep.moveTo).toHaveBeenCalled();
        });

        it('logs and returns when source is not found', () => {
            const { state, creep, mockSource } = createFixture({
                memory: {
                    destination: {
                        type: 'source',
                        id: 'unknown',
                        sourceSpot: 0,
                    },
                },
            });
            mockSource(null);

            expect(() => HarvesterHandler.run(creep, state)).not.toThrow();
            expect(creep.harvest).not.toHaveBeenCalled();
        });
    });

    describe('onSpawnDestination', () => {
        it('transfers energy when in range', () => {
            const { state, spawn, creep, mockSpawn } = createFixture({
                memory: {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
                storeUsed: 50,
                storeCapacity: 50,
            });
            mockSpawn();
            (creep.transfer as jest.Mock).mockReturnValue((global as any).OK);

            HarvesterHandler.run(creep, state);

            expect(creep.transfer).toHaveBeenCalledWith(
                spawn,
                (global as any).RESOURCE_ENERGY
            );
            expect(creep.moveTo).not.toHaveBeenCalled();
        });

        it('moves to spawn when not in range', () => {
            const { state, spawn, creep, mockSpawn } = createFixture({
                memory: {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
                storeUsed: 50,
                storeCapacity: 50,
            });
            mockSpawn();
            (creep.transfer as jest.Mock).mockReturnValue(
                (global as any).ERR_NOT_IN_RANGE
            );

            HarvesterHandler.run(creep, state);

            expect(creep.moveTo).toHaveBeenCalledWith(
                spawn,
                expect.any(Object)
            );
        });

        it('logs and returns when spawn is not found', () => {
            const { state, creep, mockSpawn } = createFixture({
                memory: {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
                storeUsed: 50,
                storeCapacity: 50,
            });
            mockSpawn(null);

            expect(() => HarvesterHandler.run(creep, state)).not.toThrow();
            expect(creep.transfer).not.toHaveBeenCalled();
        });
    });
});