import * as chai from 'chai';

import { IBlockStatementNode } from "../../src/interfaces/nodes/IBlockStatementNode";
import { IExpressionStatementNode } from "../../src/interfaces/nodes/IExpressionStatementNode";
import { IFunctionDeclarationNode } from "../../src/interfaces/nodes/IFunctionDeclarationNode";
import { IIdentifierNode } from "../../src/interfaces/nodes/IIdentifierNode";
import { IIfStatementNode } from "../../src/interfaces/nodes/IIfStatementNode";
import { ILiteralNode } from "../../src/interfaces/nodes/ILiteralNode";
import { INode } from "../../src/interfaces/nodes/INode";
import { IProgramNode } from "../../src/interfaces/nodes/IProgramNode";
import { IVariableDeclarationNode } from "../../src/interfaces/nodes/IVariableDeclarationNode";
import { IVariableDeclaratorNode } from "../../src/interfaces/nodes/IVariableDeclaratorNode";

import { NodeMocks } from '../mocks/NodeMocks';
import { NodeUtils } from '../../src/NodeUtils';

const assert: any = chai.assert;

describe('NodeUtils', () => {
    describe('addXVerbatimPropertyToLiterals (node: INode): void', () => {
        let literalNode: any,
            expectedLiteralNode: any;

        beforeEach(() => {
            literalNode = NodeMocks.getLiteralNode();
            delete literalNode['x-verbatim-property'];

            expectedLiteralNode = NodeMocks.getLiteralNode();

            NodeUtils.addXVerbatimPropertyToLiterals(literalNode);
        });

        it('should add `x-verbatim-property` to `Literal` node', () => {
            assert.deepEqual(literalNode, expectedLiteralNode);
        });
    });

    describe('appendNode (blockScopeBody: INode[], node: INode): void', () => {
        let blockStatementNode: IBlockStatementNode,
            expectedBlockStatementNode: IBlockStatementNode,
            expressionStatementNode: IExpressionStatementNode;

        beforeEach(() => {
            expressionStatementNode = NodeMocks.getExpressionStatementNode();

            blockStatementNode = NodeMocks.getBlockStatementNode();

            expectedBlockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode
            ]);

            NodeUtils.appendNode(blockStatementNode.body, expressionStatementNode);
        });

        it('should append given node to a `BlockStatement` node body', () => {
            assert.deepEqual(blockStatementNode, expectedBlockStatementNode);
        });

        it('should does not change `BlockStatement` node body if given node is not a valid Node', () => {
            assert.doesNotChange(
                () => NodeUtils.appendNode(blockStatementNode.body, <INode>{}),
                blockStatementNode,
                'body'
            );
        });
    });

    describe('convertCodeToStructure (code: string): INode', () => {
        let code: string,
            identifierNode: IIdentifierNode,
            literalNode: ILiteralNode,
            programNode: IProgramNode,
            variableDeclarationNode: IVariableDeclarationNode,
            variableDeclaratorNode: IVariableDeclaratorNode;

        beforeEach(() => {
            code = `
                var abc = 'cde';
            `;

            identifierNode = NodeMocks.getIdentifierNode('abc');

            literalNode = NodeMocks.getLiteralNode('cde');

            variableDeclaratorNode = NodeMocks.getVariableDeclaratorNode(identifierNode, literalNode);

            variableDeclarationNode = NodeMocks.getVariableDeclarationNode([
                variableDeclaratorNode
            ]);

            programNode = NodeMocks.getProgramNode([
                variableDeclarationNode
            ]);

            programNode['parentNode'] = programNode;
            variableDeclarationNode['parentNode'] = programNode;
            variableDeclaratorNode['parentNode'] = variableDeclarationNode;
            identifierNode['parentNode'] = variableDeclaratorNode;
            literalNode['parentNode'] = variableDeclaratorNode;
        });

        it('should convert code to `INode` structure', () => {
            assert.deepEqual(NodeUtils.convertCodeToStructure(code), variableDeclarationNode);
        });
    });

    describe('getBlockStatementNodeByIndex (node: INode, index: number = 0): INode', () => {
        let blockStatementNode: IBlockStatementNode,
            expressionStatementNode1: IExpressionStatementNode,
            expressionStatementNode2: IExpressionStatementNode;

        beforeEach(() => {
            expressionStatementNode1 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode2 = NodeMocks.getExpressionStatementNode();

            blockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode1,
                expressionStatementNode2
            ]);
        });

        it('should return block-statement child node of given node if that node has block-statement', () => {
            assert.deepEqual(NodeUtils.getBlockStatementNodeByIndex(blockStatementNode), expressionStatementNode1);
            assert.deepEqual(NodeUtils.getBlockStatementNodeByIndex(blockStatementNode, 1), expressionStatementNode2);
        });

        it('should throw a `ReferenceError` if index is out of boundaries', () => {
            assert.throws(() => NodeUtils.getBlockStatementNodeByIndex(blockStatementNode, 2), ReferenceError);
        });

        it('should throw a `TypeError` if node have no a block-statement', () => {
            assert.throws(() => NodeUtils.getBlockStatementNodeByIndex(expressionStatementNode1, 1), TypeError);
        });
    });

    describe('getBlockScopeOfNode (node: INode, depth: number = 0): TNodeWithBlockStatement', () => {
        let functionDeclarationBlockStatementNode: IBlockStatementNode,
            ifStatementBlockStatementNode1: IBlockStatementNode,
            ifStatementBlockStatementNode2: IBlockStatementNode,
            ifStatementNode1: IIfStatementNode,
            ifStatementNode2: IIfStatementNode,
            expressionStatementNode1: IExpressionStatementNode,
            expressionStatementNode2: IExpressionStatementNode,
            expressionStatementNode3: IExpressionStatementNode,
            functionDeclarationNode: IFunctionDeclarationNode,
            programNode: IProgramNode;

        beforeEach(() => {
            expressionStatementNode1 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode2 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode3 = NodeMocks.getExpressionStatementNode();

            ifStatementBlockStatementNode2 = NodeMocks.getBlockStatementNode([
                expressionStatementNode1,
                expressionStatementNode2
            ]);

            ifStatementNode2 = NodeMocks.getIfStatementNode(ifStatementBlockStatementNode2);

            ifStatementBlockStatementNode1 = NodeMocks.getBlockStatementNode([
                ifStatementNode2
            ]);

            ifStatementNode1 = NodeMocks.getIfStatementNode(ifStatementBlockStatementNode1);

            functionDeclarationBlockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode3,
                ifStatementNode1
            ]);

            functionDeclarationNode = NodeMocks.getFunctionDeclarationNode('test', functionDeclarationBlockStatementNode);

            programNode = NodeMocks.getProgramNode([
                functionDeclarationNode
            ]);

            programNode['parentNode'] = programNode;
            functionDeclarationNode['parentNode'] = programNode;
            functionDeclarationBlockStatementNode['parentNode'] = functionDeclarationNode;
            expressionStatementNode3['parentNode'] = functionDeclarationBlockStatementNode;
            ifStatementNode1['parentNode'] = functionDeclarationBlockStatementNode;
            ifStatementBlockStatementNode1['parentNode'] = ifStatementNode1;
            ifStatementNode2['parentNode'] = ifStatementBlockStatementNode1;
            ifStatementBlockStatementNode2['parentNode'] = ifStatementNode2;
            expressionStatementNode1['parentNode'] = ifStatementBlockStatementNode2;
        });

        it('should return block-scope node for given node', () => {
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(expressionStatementNode3), functionDeclarationBlockStatementNode);
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(expressionStatementNode3, 1), programNode);
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(functionDeclarationNode), programNode);
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(functionDeclarationBlockStatementNode), programNode);
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(programNode), programNode);
            assert.deepEqual(NodeUtils.getBlockScopeOfNode(expressionStatementNode1), functionDeclarationBlockStatementNode);
        });

        it('should throw a `ReferenceError` if node has no `parentNode` property', () => {
            assert.throws(() => NodeUtils.getBlockScopeOfNode(expressionStatementNode2), ReferenceError);
        });
    });

    describe('insertNodeAtIndex (blockScopeBody: INode[], node: INode, index: number): void', () => {
        let blockStatementNode: IBlockStatementNode,
            expectedBlockStatementNode: IBlockStatementNode,
            expressionStatementNode1: IExpressionStatementNode,
            expressionStatementNode2: IExpressionStatementNode;

        beforeEach(() => {
            expressionStatementNode1 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode2 = NodeMocks.getExpressionStatementNode();

            blockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode1
            ]);

            expectedBlockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode1,
                expressionStatementNode1
            ]);

            NodeUtils.insertNodeAtIndex(blockStatementNode.body, expressionStatementNode2, 1);
        });

        it('should insert given node in `BlockStatement` node body at index', () => {
            assert.deepEqual(blockStatementNode, expectedBlockStatementNode);
        });

        it('should does not change `BlockStatement` node body if given node is not a valid Node', () => {
            assert.doesNotChange(
                () => NodeUtils.insertNodeAtIndex(blockStatementNode.body, <INode>{}, 1),
                blockStatementNode,
                'body'
            );
        });
    });

    describe('parentize (node: INode): void', () => {
        let ifStatementNode: IIfStatementNode,
            ifStatementBlockStatementNode: IBlockStatementNode,
            expressionStatementNode1: IExpressionStatementNode,
            expressionStatementNode2: IExpressionStatementNode,
            programNode: IProgramNode;

        beforeEach(() => {
            expressionStatementNode1 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode2 = NodeMocks.getExpressionStatementNode();

            ifStatementBlockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode1,
                expressionStatementNode2
            ]);

            ifStatementNode = NodeMocks.getIfStatementNode(ifStatementBlockStatementNode);
        });

        it('should parentize given AST-tree with `ProgramNode` as root node', () => {
            programNode = NodeMocks.getProgramNode([
                ifStatementNode
            ]);

            NodeUtils.parentize(programNode);

            assert.deepEqual(programNode['parentNode'], programNode);
            assert.deepEqual(ifStatementNode['parentNode'], programNode);
            assert.deepEqual(ifStatementBlockStatementNode['parentNode'], ifStatementNode);
            assert.deepEqual(expressionStatementNode1['parentNode'], ifStatementBlockStatementNode);
            assert.deepEqual(expressionStatementNode2['parentNode'], ifStatementBlockStatementNode);
        });

        it('should parentize given AST-tree', () => {
            programNode = NodeMocks.getProgramNode([
                ifStatementNode
            ]);
            programNode['parentNode'] = programNode;

            NodeUtils.parentize(ifStatementNode);

            assert.deepEqual(ifStatementNode['parentNode'], programNode);
            assert.deepEqual(ifStatementBlockStatementNode['parentNode'], ifStatementNode);
            assert.deepEqual(expressionStatementNode1['parentNode'], ifStatementBlockStatementNode);
            assert.deepEqual(expressionStatementNode2['parentNode'], ifStatementBlockStatementNode);
        });
    });

    describe('prependNode (blockScopeBody: INode[], node: INode): void', () => {
        let blockStatementNode: IBlockStatementNode,
            expectedBlockStatementNode: IBlockStatementNode,
            expressionStatementNode1: IExpressionStatementNode,
            expressionStatementNode2: IExpressionStatementNode;

        beforeEach(() => {
            expressionStatementNode1 = NodeMocks.getExpressionStatementNode();
            expressionStatementNode2 = NodeMocks.getExpressionStatementNode();

            blockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode1
            ]);

            expectedBlockStatementNode = NodeMocks.getBlockStatementNode([
                expressionStatementNode2,
                expressionStatementNode1
            ]);

            NodeUtils.prependNode(blockStatementNode.body, expressionStatementNode2);
        });

        it('should prepend given node to a `BlockStatement` node body', () => {
            assert.deepEqual(blockStatementNode, expectedBlockStatementNode);
        });

        it('should does not change `BlockStatement` node body if given node is not a valid Node', () => {
            assert.doesNotChange(
                () => NodeUtils.prependNode(blockStatementNode.body, <INode>{}),
                blockStatementNode,
                'body'
            );
        });
    });
});