import {BST, BSTNode} from '../src';

describe('BST operations test', () => {
    it('should perform various operations on a Binary Search Tree with numeric values', () => {
        const bst = new BST();
        expect(bst).toBeInstanceOf(BST);
        bst.add(11, 11);
        bst.add(3, 3);
        const idsAndValues = [15, 1, 8, 13, 16, 2, 6, 9, 12, 14, 4, 7, 10, 5];
        bst.addMany(idsAndValues, idsAndValues);
        expect(bst.root).toBeInstanceOf(BSTNode);

        if (bst.root) expect(bst.root.id).toBe(11);

        expect(bst.size).toBe(16);

        expect(bst.has(6)).toBe(true);

        const node6 = bst.get(6);
        expect(node6 && bst.getHeight(6)).toBe(2);
        expect(node6 && bst.getDepth(6)).toBe(3);

        const nodeId10 = bst.get(10);
        expect(nodeId10?.id).toBe(10);

        const nodeVal9 = bst.get(9, 'val');
        expect(nodeVal9?.id).toBe(9);

        const leftMost = bst.getLeftMost();
        expect(leftMost?.id).toBe(1);

        const node15 = bst.get(15);
        const minNodeBySpecificNode = node15 && bst.getLeftMost(node15);
        expect(minNodeBySpecificNode?.id).toBe(12);

        const subTreeSum = node15 && bst.subTreeSum(15);
        expect(subTreeSum).toBe(70);

        const lesserSum = bst.lesserSum(10);
        expect(lesserSum).toBe(45);

        expect(node15).toBeInstanceOf(BSTNode);

        const node11 = bst.get(11);
        expect(node11).toBeInstanceOf(BSTNode);

        const dfsInorderNodes = bst.DFS('in', 'node');
        expect(dfsInorderNodes[0].id).toBe(1);
        expect(dfsInorderNodes[dfsInorderNodes.length - 1].id).toBe(16);

        bst.perfectlyBalance();
        expect(bst.isPerfectlyBalanced()).toBe(true);

        const bfsNodesAfterBalanced = bst.BFS('node');
        expect(bfsNodesAfterBalanced[0].id).toBe(8);
        expect(bfsNodesAfterBalanced[bfsNodesAfterBalanced.length - 1].id).toBe(16);

        const removed11 = bst.remove(11);
        expect(removed11).toBeInstanceOf(Array);
        expect(removed11[0]).toBeDefined();
        expect(removed11[0].deleted).toBeDefined();

        if (removed11[0].deleted) expect(removed11[0].deleted.id).toBe(11);

        expect(bst.isAVLBalanced()).toBe(true);

        expect(bst.getHeight(15)).toBe(1);

        const removed1 = bst.remove(1);
        expect(removed1).toBeInstanceOf(Array);
        expect(removed1[0]).toBeDefined();
        expect(removed1[0].deleted).toBeDefined();
        if (removed1[0].deleted) expect(removed1[0].deleted.id).toBe(1);

        expect(bst.isAVLBalanced()).toBe(true);

        expect(bst.getHeight()).toBe(4);

        const removed4 = bst.remove(4);
        expect(removed4).toBeInstanceOf(Array);
        expect(removed4[0]).toBeDefined();
        expect(removed4[0].deleted).toBeDefined();
        if (removed4[0].deleted) expect(removed4[0].deleted.id).toBe(4);
        expect(bst.isAVLBalanced()).toBe(true);
        expect(bst.getHeight()).toBe(4);

        const removed10 = bst.remove(10);
        expect(removed10).toBeInstanceOf(Array);
        expect(removed10[0]).toBeDefined();
        expect(removed10[0].deleted).toBeDefined();
        if (removed10[0].deleted) expect(removed10[0].deleted.id).toBe(10);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(4);

        const removed15 = bst.remove(15);
        expect(removed15).toBeInstanceOf(Array);
        expect(removed15[0]).toBeDefined();
        expect(removed15[0].deleted).toBeDefined();
        if (removed15[0].deleted) expect(removed15[0].deleted.id).toBe(15);

        expect(bst.isAVLBalanced()).toBe(true);
        expect(bst.getHeight()).toBe(3);

        const removed5 = bst.remove(5);
        expect(removed5).toBeInstanceOf(Array);
        expect(removed5[0]).toBeDefined();
        expect(removed5[0].deleted).toBeDefined();
        if (removed5[0].deleted) expect(removed5[0].deleted.id).toBe(5);

        expect(bst.isAVLBalanced()).toBe(true);
        expect(bst.getHeight()).toBe(3);

        const removed13 = bst.remove(13);
        expect(removed13).toBeInstanceOf(Array);
        expect(removed13[0]).toBeDefined();
        expect(removed13[0].deleted).toBeDefined();
        if (removed13[0].deleted) expect(removed13[0].deleted.id).toBe(13);
        expect(bst.isAVLBalanced()).toBe(true);
        expect(bst.getHeight()).toBe(3);

        const removed3 = bst.remove(3);
        expect(removed3).toBeInstanceOf(Array);
        expect(removed3[0]).toBeDefined();
        expect(removed3[0].deleted).toBeDefined();
        if (removed3[0].deleted) expect(removed3[0].deleted.id).toBe(3);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(3);

        const removed8 = bst.remove(8);
        expect(removed8).toBeInstanceOf(Array);
        expect(removed8[0]).toBeDefined();
        expect(removed8[0].deleted).toBeDefined();
        if (removed8[0].deleted) expect(removed8[0].deleted.id).toBe(8);
        expect(bst.isAVLBalanced()).toBe(true);
        expect(bst.getHeight()).toBe(3);

        const removed6 = bst.remove(6);
        expect(removed6).toBeInstanceOf(Array);
        expect(removed6[0]).toBeDefined();
        expect(removed6[0].deleted).toBeDefined();
        if (removed6[0].deleted) expect(removed6[0].deleted.id).toBe(6);
        expect(bst.remove(6).length).toBe(0);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(3);

        const removed7 = bst.remove(7);
        expect(removed7).toBeInstanceOf(Array);
        expect(removed7[0]).toBeDefined();
        expect(removed7[0].deleted).toBeDefined();
        if (removed7[0].deleted) expect(removed7[0].deleted.id).toBe(7);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(3);

        const removed9 = bst.remove(9);
        expect(removed9).toBeInstanceOf(Array);
        expect(removed9[0]).toBeDefined();
        expect(removed9[0].deleted).toBeDefined();
        if (removed9[0].deleted) expect(removed9[0].deleted.id).toBe(9);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(3);

        const removed14 = bst.remove(14);
        expect(removed14).toBeInstanceOf(Array);
        expect(removed14[0]).toBeDefined();
        expect(removed14[0].deleted).toBeDefined();
        if (removed14[0].deleted) expect(removed14[0].deleted.id).toBe(14);
        expect(bst.isAVLBalanced()).toBe(false);
        expect(bst.getHeight()).toBe(2);

        expect(bst.isAVLBalanced()).toBe(false);

        const bfsIDs = bst.BFS();
        expect(bfsIDs[0]).toBe(2);
        expect(bfsIDs[1]).toBe(12);
        expect(bfsIDs[2]).toBe(16);

        const bfsNodes = bst.BFS('node');
        expect(bfsNodes[0].id).toBe(2);
        expect(bfsNodes[1].id).toBe(12);
        expect(bfsNodes[2].id).toBe(16);
    });

    it('should perform various operations on a Binary Search Tree with object values', () => {
        const objBST = new BST<BSTNode<{ id: number; keyA: number }>>();
        expect(objBST).toBeInstanceOf(BST);
        objBST.add(11, {id: 11, keyA: 11});
        objBST.add(3, {id: 3, keyA: 3});
        const values = [
            {id: 15, keyA: 15},
            {id: 1, keyA: 1},
            {id: 8, keyA: 8},
            {id: 13, keyA: 13},
            {id: 16, keyA: 16},
            {id: 2, keyA: 2},
            {id: 6, keyA: 6},
            {id: 9, keyA: 9},
            {id: 12, keyA: 12},
            {id: 14, keyA: 14},
            {id: 4, keyA: 4},
            {id: 7, keyA: 7},
            {id: 10, keyA: 10},
            {id: 5, keyA: 5}
        ];

        objBST.addMany(
            values.map(item => item.id),
            values
        );

        expect(objBST.root).toBeInstanceOf(BSTNode);

        if (objBST.root) expect(objBST.root.id).toBe(11);

        expect(objBST.has(6)).toBe(true);

        const node6 = objBST.get(6);
        expect(node6 && objBST.getHeight(node6)).toBe(2);
        expect(node6 && objBST.getDepth(node6)).toBe(3);

        const nodeId10 = objBST.get(10, 'id');
        expect(nodeId10?.id).toBe(10);

        const nodeVal9 = objBST.get(9, 'id');
        expect(nodeVal9?.id).toBe(9);

        const leftMost = objBST.getLeftMost();
        expect(leftMost?.id).toBe(1);

        const node15 = objBST.get(15);
        expect(node15?.val).toEqual({id: 15, keyA: 15});
        const minNodeBySpecificNode = node15 && objBST.getLeftMost(node15);
        expect(minNodeBySpecificNode?.id).toBe(12);

        const subTreeSum = node15 && objBST.subTreeSum(node15);
        expect(subTreeSum).toBe(70);

        const lesserSum = objBST.lesserSum(10);
        expect(lesserSum).toBe(45);

        expect(node15).toBeInstanceOf(BSTNode);

        const node11 = objBST.get(11);
        expect(node11).toBeInstanceOf(BSTNode);

        const dfsInorderNodes = objBST.DFS('in', 'node');
        expect(dfsInorderNodes[0].id).toBe(1);
        expect(dfsInorderNodes[dfsInorderNodes.length - 1].id).toBe(16);

        objBST.perfectlyBalance();
        expect(objBST.isPerfectlyBalanced()).toBe(true);

        const bfsNodesAfterBalanced = objBST.BFS('node');
        expect(bfsNodesAfterBalanced[0].id).toBe(8);
        expect(bfsNodesAfterBalanced[bfsNodesAfterBalanced.length - 1].id).toBe(16);

        const removed11 = objBST.remove(11);
        expect(removed11).toBeInstanceOf(Array);
        expect(removed11[0]).toBeDefined();
        expect(removed11[0].deleted).toBeDefined();

        if (removed11[0].deleted) expect(removed11[0].deleted.id).toBe(11);

        expect(objBST.isAVLBalanced()).toBe(true);

        expect(node15 && objBST.getHeight(node15)).toBe(2);

        const removed1 = objBST.remove(1);
        expect(removed1).toBeInstanceOf(Array);
        expect(removed1[0]).toBeDefined();
        expect(removed1[0].deleted).toBeDefined();
        if (removed1[0].deleted) expect(removed1[0].deleted.id).toBe(1);

        expect(objBST.isAVLBalanced()).toBe(true);

        expect(objBST.getHeight()).toBe(4);

        const removed4 = objBST.remove(4);
        expect(removed4).toBeInstanceOf(Array);
        expect(removed4[0]).toBeDefined();
        expect(removed4[0].deleted).toBeDefined();
        if (removed4[0].deleted) expect(removed4[0].deleted.id).toBe(4);
        expect(objBST.isAVLBalanced()).toBe(true);
        expect(objBST.getHeight()).toBe(4);

        const removed10 = objBST.remove(10);
        expect(removed10).toBeInstanceOf(Array);
        expect(removed10[0]).toBeDefined();
        expect(removed10[0].deleted).toBeDefined();
        if (removed10[0].deleted) expect(removed10[0].deleted.id).toBe(10);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(4);

        const removed15 = objBST.remove(15);
        expect(removed15).toBeInstanceOf(Array);
        expect(removed15[0]).toBeDefined();
        expect(removed15[0].deleted).toBeDefined();
        if (removed15[0].deleted) expect(removed15[0].deleted.id).toBe(15);

        expect(objBST.isAVLBalanced()).toBe(true);
        expect(objBST.getHeight()).toBe(3);

        const removed5 = objBST.remove(5);
        expect(removed5).toBeInstanceOf(Array);
        expect(removed5[0]).toBeDefined();
        expect(removed5[0].deleted).toBeDefined();
        if (removed5[0].deleted) expect(removed5[0].deleted.id).toBe(5);

        expect(objBST.isAVLBalanced()).toBe(true);
        expect(objBST.getHeight()).toBe(3);

        const removed13 = objBST.remove(13);
        expect(removed13).toBeInstanceOf(Array);
        expect(removed13[0]).toBeDefined();
        expect(removed13[0].deleted).toBeDefined();
        if (removed13[0].deleted) expect(removed13[0].deleted.id).toBe(13);
        expect(objBST.isAVLBalanced()).toBe(true);
        expect(objBST.getHeight()).toBe(3);

        const removed3 = objBST.remove(3);
        expect(removed3).toBeInstanceOf(Array);
        expect(removed3[0]).toBeDefined();
        expect(removed3[0].deleted).toBeDefined();
        if (removed3[0].deleted) expect(removed3[0].deleted.id).toBe(3);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(3);

        const removed8 = objBST.remove(8);
        expect(removed8).toBeInstanceOf(Array);
        expect(removed8[0]).toBeDefined();
        expect(removed8[0].deleted).toBeDefined();
        if (removed8[0].deleted) expect(removed8[0].deleted.id).toBe(8);
        expect(objBST.isAVLBalanced()).toBe(true);
        expect(objBST.getHeight()).toBe(3);

        const removed6 = objBST.remove(6);
        expect(removed6).toBeInstanceOf(Array);
        expect(removed6[0]).toBeDefined();
        expect(removed6[0].deleted).toBeDefined();
        if (removed6[0].deleted) expect(removed6[0].deleted.id).toBe(6);
        expect(objBST.remove(6).length).toBe(0);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(3);

        const removed7 = objBST.remove(7);
        expect(removed7).toBeInstanceOf(Array);
        expect(removed7[0]).toBeDefined();
        expect(removed7[0].deleted).toBeDefined();
        if (removed7[0].deleted) expect(removed7[0].deleted.id).toBe(7);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(3);

        const removed9 = objBST.remove(9);
        expect(removed9).toBeInstanceOf(Array);
        expect(removed9[0]).toBeDefined();
        expect(removed9[0].deleted).toBeDefined();
        if (removed9[0].deleted) expect(removed9[0].deleted.id).toBe(9);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(3);

        const removed14 = objBST.remove(14);
        expect(removed14).toBeInstanceOf(Array);
        expect(removed14[0]).toBeDefined();
        expect(removed14[0].deleted).toBeDefined();
        if (removed14[0].deleted) expect(removed14[0].deleted.id).toBe(14);
        expect(objBST.isAVLBalanced()).toBe(false);
        expect(objBST.getHeight()).toBe(2);

        expect(objBST.isAVLBalanced()).toBe(false);

        const bfsIDs = objBST.BFS();
        expect(bfsIDs[0]).toBe(2);
        expect(bfsIDs[1]).toBe(12);
        expect(bfsIDs[2]).toBe(16);

        const bfsNodes = objBST.BFS('node');
        expect(bfsNodes[0].id).toBe(2);
        expect(bfsNodes[1].id).toBe(12);
        expect(bfsNodes[2].id).toBe(16);
    });
});