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package com.google.refine.commands.expr;

import static org.mockito.Mockito.when;

import java.io.IOException;
import java.io.Serializable;

import javax.servlet.ServletException;

import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import com.google.refine.commands.Command;
import com.google.refine.commands.CommandTestBase;
import com.google.refine.expr.MetaParser;
import com.google.refine.grel.Parser;
import com.google.refine.model.Project;
import com.google.refine.util.TestUtils;

public class PreviewExpressionCommandTests extends CommandTestBase {

    protected Project project = null;

    @BeforeMethod
    public void setUpCommandAndProject() {
        command = new PreviewExpressionCommand();
        project = createProject(
                new String[] { "a", "b" },
                new Serializable[][] {
                        { "c", "d" },
                        { "e", "f" },
                        { "g", "h" }
                });
    }

    @BeforeMethod
    public void registerGRELParser() {
        MetaParser.registerLanguageParser("grel", "GREL", Parser.grelParser, "value");
    }

    @AfterMethod
    public void unregisterGRELParser() {
        MetaParser.unregisterLanguageParser("grel");
    }

    @Test
    public void testCSRFProtection() throws ServletException, IOException {
        command.doPost(request, response);
        assertCSRFCheckFailed();
    }

    @Test
    public void testJsonResponse() throws ServletException, IOException {
        when(request.getParameter("csrf_token")).thenReturn(Command.csrfFactory.getFreshToken());
        when(request.getParameter("project")).thenReturn(Long.toString(project.id));
        when(request.getParameter("cellIndex")).thenReturn("1");
        when(request.getParameter("expression")).thenReturn("grel:value + \"_u\"");
        when(request.getParameter("rowIndices")).thenReturn("[0,2]");

        String json = "{\n" +
                "       \"code\" : \"ok\",\n" +
                "       \"results\" : [ \"d_u\", \"h_u\" ]\n" +
                "     }";
        command.doPost(request, response);
        TestUtils.assertEqualsAsJson(writer.toString(), json);
    }

    @Test
    public void testParseError() throws ServletException, IOException {
        when(request.getParameter("csrf_token")).thenReturn(Command.csrfFactory.getFreshToken());
        when(request.getParameter("project")).thenReturn(Long.toString(project.id));
        when(request.getParameter("cellIndex")).thenReturn("1");
        when(request.getParameter("expression")).thenReturn("grel:value +");
        when(request.getParameter("rowIndices")).thenReturn("[0,2]");

        String json = "{\n" +
                "       \"code\" : \"error\",\n" +
                "       \"message\" : \"Parsing error at offset 7: Expecting something more at end of expression\",\n" +
                "       \"type\" : \"parser\"\n" +
                "     }";
        command.doPost(request, response);
        TestUtils.assertEqualsAsJson(writer.toString(), json);
    }
}
