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

// ─── Helpers ────────────────────────────────────────────────────────────────

function makeMatrix(fill: string = PositionSpotStatus.EMPTY) {
    const m = createSourcePositionMatrix(fill as any);
    return m;
}

function makeState(overrides: Partial<GameState> = {}): GameState {
    const spots = makeMatrix();
    return {
        sourcesStates: {
            src1: { spots },
        },
        ...overrides,
    } as unknown as GameState;
}

function makeCreepMemory(overrides: Partial<CreepMemory> = {}): CreepMemory {
    return {
        role: 'harvester',
        spawnId: 'spawn1',
        ...overrides,
    } as CreepMemory;
}

function makeStore(used: number, capacity: number) {
    return {
        getFreeCapacity: (_res: string) => capacity - used,
        getUsedCapacity: (_res: string) => used,
    };
}

function makePos(x = 0, y = 0, roomName = 'W1N1') {
    return new (global as any).RoomPosition(x, y, roomName);
}

function makeSource(id = 'src1', x = 5, y = 5, roomName = 'W1N1') {
    return {
        id,
        pos: makePos(x, y, roomName),
    } as unknown as Source;
}

function makeSpawn(id = 'spawn1') {
    return { id } as unknown as StructureSpawn;
}

function makeCreep(
    memoryOverrides: Partial<CreepMemory> = {},
    storeUsed = 0,
    storeCapacity = 50
): Creep {
    const memory = makeCreepMemory(memoryOverrides);
    return {
        name: 'Creep1',
        memory,
        store: makeStore(storeUsed, storeCapacity),
        pos: makePos(),
        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;
}

// ─── Tests ───────────────────────────────────────────────────────────────────

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

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

    // ── destroy ──────────────────────────────────────────────────────────────

    describe('destroy', () => {
        it('releases the source spot from destination and clears it', () => {
            const state = makeState();
            state.sourcesStates['src1'].spots[0] = PositionSpotStatus.OCCUPIED;

            const memory = makeCreepMemory({
                destination: { type: 'source', id: 'src1', sourceSpot: 0 },
            });

            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 = makeState();
            state.sourcesStates['src1'].spots[2] = PositionSpotStatus.OCCUPIED;

            const memory = makeCreepMemory({
                previousDestination: {
                    type: 'source',
                    id: 'src1',
                    sourceSpot: 2,
                },
            });

            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 = makeState();
            const memory = makeCreepMemory({
                destination: { type: 'spawn', id: 'spawn1' },
            });

            HarvesterHandler.destroy(memory, state);

            // None of the source spots should have changed
            expect(
                state.sourcesStates['src1'].spots.every(
                    (s) =>
                        s === PositionSpotStatus.EMPTY ||
                        s === PositionSpotStatus.CENTER
                )
            ).toBe(true);
        });

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

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

    // ── validateCreepMemory (via run) ────────────────────────────────────────

    describe('validateCreepMemory (via run)', () => {
        it('releases previousDestination source spot and deletes it', () => {
            const state = makeState();
            state.sourcesStates['src1'].spots[1] = PositionSpotStatus.OCCUPIED;

            const creep = makeCreep({
                previousDestination: {
                    type: 'source',
                    id: 'src1',
                    sourceSpot: 1,
                },
            });

            jest.spyOn(getById, 'getSourceById').mockReturnValue(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 = makeState();
            const source = makeSource();
            jest.spyOn(getById, 'getSourceById').mockReturnValue(source);
            jest.spyOn(getById, 'getSpawnById').mockReturnValue(makeSpawn());

            const creep = makeCreep(
                {
                    destination: { type: 'source', id: 'src1', sourceSpot: 0 },
                    spawnId: 'spawn1',
                },
                50, // used = full
                50
            );

            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 = makeState();
            jest.spyOn(getById, 'getSpawnById').mockReturnValue(makeSpawn());

            const creep = makeCreep(
                {
                    destination: { type: 'spawn', id: 'spawn1' },
                },
                0, // used = 0
                50
            );

            HarvesterHandler.run(creep, state);

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

    // ── onFindNewSource ───────────────────────────────────────────────────────

    describe('onFindNewSource', () => {
        it('assigns the first available source spot to the creep', () => {
            const state = makeState();
            jest.spyOn(getById, 'getSourceById').mockReturnValue(makeSource());

            const creep = makeCreep(); // no destination, empty store

            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 = makeState();
            // Fill all non-center spots with OCCUPIED
            state.sourcesStates['src1'].spots = state.sourcesStates[
                'src1'
            ].spots.map((s) =>
                s === PositionSpotStatus.CENTER
                    ? s
                    : PositionSpotStatus.OCCUPIED
            ) as any;

            jest.spyOn(getById, 'getSourceById').mockReturnValue(makeSource());
            const creep = makeCreep();

            HarvesterHandler.run(creep, state);

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

    // ── onSourceDestination ───────────────────────────────────────────────────

    describe('onSourceDestination', () => {
        it('harvests when in range', () => {
            const state = makeState();
            const source = makeSource();
            jest.spyOn(getById, 'getSourceById').mockReturnValue(source);

            const creep = makeCreep(
                { destination: { type: 'source', id: 'src1', sourceSpot: 0 } },
                0,
                50
            );
            (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 = makeState();
            const source = makeSource();
            jest.spyOn(getById, 'getSourceById').mockReturnValue(source);

            const creep = makeCreep(
                { destination: { type: 'source', id: 'src1', sourceSpot: 0 } },
                0,
                50
            );
            (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 = makeState();
            jest.spyOn(getById, 'getSourceById').mockReturnValue(null);

            const creep = makeCreep(
                {
                    destination: {
                        type: 'source',
                        id: 'unknown',
                        sourceSpot: 0,
                    },
                },
                0,
                50
            );

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

    // ── onSpawnDestination ────────────────────────────────────────────────────

    describe('onSpawnDestination', () => {
        it('transfers energy when in range', () => {
            const state = makeState();
            const spawn = makeSpawn();
            jest.spyOn(getById, 'getSpawnById').mockReturnValue(spawn);

            const creep = makeCreep(
                { destination: { type: 'spawn', id: 'spawn1' } },
                50,
                50
            );
            (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 = makeState();
            const spawn = makeSpawn();
            jest.spyOn(getById, 'getSpawnById').mockReturnValue(spawn);

            const creep = makeCreep(
                { destination: { type: 'spawn', id: 'spawn1' } },
                50,
                50
            );
            (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 = makeState();
            jest.spyOn(getById, 'getSpawnById').mockReturnValue(null);

            const creep = makeCreep(
                { destination: { type: 'spawn', id: 'spawn1' } },
                50,
                50
            );

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