package de.superx.rest;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.web.servlet.MvcResult;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import de.superx.BaseWebTest;
import de.superx.bianalysis.metadata.Identifier;
import de.superx.bianalysis.metadata.MetadataImporter;
import de.superx.bianalysis.models.Condition;
import de.superx.bianalysis.models.CriteriaGroup;
import de.superx.bianalysis.repository.DimensionAttributeRepository;
import de.superx.bianalysis.repository.DimensionRepository;
import de.superx.bianalysis.repository.dto.AttributeDto;
import de.superx.bianalysis.repository.dto.DimensionDto;
import de.superx.bianalysis.service.DbMetaAdapter;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import java.nio.charset.StandardCharsets;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class BiAnalysisAdminApiTest extends BaseWebTest {

    private static final String ADMIN_BASE_ROUTE = "/api/bianalysis/admin";
    private static final String ATTRIBUTE_GROUP_ROUTE = ADMIN_BASE_ROUTE + "/attribute-group";
    private static final String ATTRIBUTE_GROUP_VALIDATE = ATTRIBUTE_GROUP_ROUTE + "/validate";
    
    @Autowired
    DbMetaAdapter dbMetaAdapter;

    @Autowired
    DimensionAttributeRepository dimensionAttrRepo;

    @Autowired
    DimensionRepository dimensionRepository;

    @After
    public void cleanup() {
       JdbcTemplate jt = new JdbcTemplate(dataSource);
       String sqlCleanup = """
          DELETE FROM metadata.facttable WHERE namespace = 'dummy_api';
          DELETE FROM metadata.dimension WHERE namespace = 'dummy_api' OR namespace = 'conf_dummy';
          DELETE FROM metadata.dimension_attribute WHERE namespace = 'dummy_api' OR namespace = 'conf_dummy';
          DELETE FROM metadata.dimension_attribute WHERE id like 'custom%';
          DROP TABLE IF EXISTS presentation.dim_person_dummy;
          """;
       jt.execute(sqlCleanup);
    }
    
    @Before
    public void init() {
        assertEquals(0, getCustomAttributes().size()); // sanity check
        String dummyConformedDimension = """
                {
                    "namespace" : "conf_dummy",
                    "conformed_dimensions" : [
                        {
                            "id" : "conf_dummy:1",
                            "caption" : "Person",
                            "dimension" : "dim_person_dummy",
                            "fact_column" : "person_id",
                            "attributes" : [
                                {
                                    "id" : "conf_dummy:2",
                                    "caption" : "Geburtsjahr",
                                    "dim_column" : "year_of_birth"
                                }
                            ]
                        }
                    ]
                }
                """;
        
        String dummyFacttable = """
                {
                    "namespace" : "dummy_api",
                    "facts" : [
                        {
                            "id" : "dummy_api:2",
                            "caption" : "Publikationsstern",
                            "facttable" : "fact_publication_dummy",
                            "dimensions" : [
                                {
                                    "id" : "dummy_api:3",
                                    "caption" : "Dozent",
                                    "ref_to" : "dim_person_dummy",
                                    "fact_column" : "person_id",
                                    "attributes" : [
                                        {
                                          "id" : "dummy_api:4",
                                          "ref_to" : "year_of_birth"
                                        }
                                    ]
                                }
                            ],
                            "measures" : []
                        },
                        {
                            "id" : "dummy_api:5",
                            "caption" : "Bewerberstern",
                            "facttable" : "fact_applicant_dummy",
                            "dimensions" : [
                                {
                                    "id" : "dummy_api:6",
                                    "caption" : "Bewerber",
                                    "ref_to" : "dim_person_dummy",
                                    "fact_column" : "person_id",
                                    "attributes" : [
                                        {
                                          "id" : "dummy_api:7",
                                          "ref_to" : "year_of_birth"
                                        }
                                    ]
                                }
                            ],
                            "measures" : []
                        }
                    ]
                }
                """;
         
        JdbcTemplate jt = new JdbcTemplate(dataSource);
        MetadataImporter importer = new MetadataImporter();
        importer.deserializeMetadataFromStrings(dummyConformedDimension, dummyFacttable);
        String upserts = String.join("\n", importer.getAllUpsertStrings(false));
        jt.execute(upserts);
        jt.execute("CREATE TABLE presentation.dim_person_dummy"
                + " (id SERIAL PRIMARY KEY, year_of_birth varchar NOT NULL);");
        String sql = "INSERT INTO presentation.dim_person_dummy (year_of_birth) VALUES (?)";
        for (int year = 1990; year <= 2015; year++) {
            jt.update(sql, String.valueOf(year));
        }
        // TODO fix pre authorization guard for tests
        //user.getRightsMap().put("RIGHT_CS_BIA_ANALYSIS_MANAGE_METADATA", null);
    }
    

    @Test
    public void testCreationAndDeletionOfAttributeGroup() throws Exception {
        MvcResult result = mockMvc.perform(put(ATTRIBUTE_GROUP_ROUTE)
                .contentType(MediaType.APPLICATION_JSON)
                .characterEncoding("UTF-8")
                .param("dimension_id", "dummy_api:6")
                .content(getAttributeJson("Neue Geburtsjahrgaenge", "").getBytes(StandardCharsets.UTF_8)))
        .andDo(print())
        .andExpect(status().isOk())
        .andReturn();

        String responseBody = result.getResponse().getContentAsString();
        Identifier id = new ObjectMapper().readValue(responseBody, Identifier.class);
        assertNotNull(id);
        
        Optional<AttributeDto> attributeOpt = this.dimensionAttrRepo.findById(id);
        assertTrue(attributeOpt.isPresent());

        AttributeDto attribute = attributeOpt.get();
        Optional<DimensionDto> dimensionOpt = this.dimensionRepository.findById(attribute.dimensionId);
        assertTrue(dimensionOpt.isPresent());
        DimensionDto dimension = dimensionOpt.get();
        assertEquals(new Identifier("dummy_api:6"), dimension.id);

        List<AttributeDto> customAttributes = getCustomAttributes();
        assertEquals(3, customAttributes.size());

        AttributeDto applicantRolePlaying = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:1"));
        AttributeDto teacherRolePlaying = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:3"));
        AttributeDto personConformed = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:2"));

        assertEquals("Neue Geburtsjahrgaenge", personConformed.caption);
        assertEquals("custom_neue_geburtsjahrgaenge", personConformed.columnname);
        assertNotNull(personConformed.criteriaGroups);
        assertEquals("my description", personConformed.description);
        assertTrue(personConformed.attrConformedId == null);
        assertTrue(personConformed.isHidden.booleanValue());

        assertEquals("Neue Geburtsjahrgaenge", applicantRolePlaying.caption);
        assertEquals("custom_neue_geburtsjahrgaenge", applicantRolePlaying.columnname);
        assertEquals("custom_neue_geburtsjahrgaenge", applicantRolePlaying.columnname);
        assertEquals("my description", applicantRolePlaying.description);
        assertEquals("custom:2", applicantRolePlaying.attrConformedId);
        assertEquals("dummy_api:6", applicantRolePlaying.dimensionId.composedId);
        assertNotNull(applicantRolePlaying.criteriaGroups);
        assertTrue(!applicantRolePlaying.isHidden.booleanValue());

        assertEquals("Neue Geburtsjahrgaenge", teacherRolePlaying.caption);
        assertEquals("custom_neue_geburtsjahrgaenge", teacherRolePlaying.columnname);
        assertEquals("custom_neue_geburtsjahrgaenge", teacherRolePlaying.columnname);
        assertEquals("my description", teacherRolePlaying.description);
        assertEquals("custom:2", teacherRolePlaying.attrConformedId);
        assertEquals("dummy_api:3", teacherRolePlaying.dimensionId.composedId);
        assertNotNull(teacherRolePlaying.criteriaGroups);
        assertTrue(teacherRolePlaying.isHidden.booleanValue());

        List<CriteriaGroup> criteriaGroups = attribute.readCriteriaGroups();
        assertEquals(criteriaGroups.size(), 3);
        for (CriteriaGroup criteriaGroup : criteriaGroups) {
            if(criteriaGroup.caption.equals("2001 - 2005")) {
                assertEquals(List.of("2001", "2002", "2003", "2004", "2005"),
                        Condition.fromMap(criteriaGroup.conditions.get(0)).values); 
            } else if(criteriaGroup.caption.equals("2006 - 2010")) {
                assertEquals(List.of("2006", "2007", "2008", "2009"),
                        Condition.fromMap(criteriaGroup.conditions.get(0)).values); 
            } else if(criteriaGroup.caption.equals("n.a")) {
                assertTrue(criteriaGroup.isElse);
            } else {
                Assert.fail("Wrong criteria group: " + criteriaGroup.caption); 
            }
        }

        assertTrue(columnExists("presentation", dimension.tablename, "custom_neue_geburtsjahrgaenge"));
        assertTrue(columnExists("presentation", dimension.tablename, "custom_neue_geburtsjahrgaenge_sort_order"));

        result = mockMvc.perform(put(ATTRIBUTE_GROUP_ROUTE)
                .contentType(MediaType.APPLICATION_JSON)
                .characterEncoding("UTF-8")
                .param("dimension_id", "dummy_api:6")
                .content(getAttributeJson("Umbenannte Caption", "\"id\": \"custom:1\",").getBytes(StandardCharsets.UTF_8)))
        .andDo(print())
        .andExpect(status().isOk())
        .andReturn();
        
        applicantRolePlaying = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:1"));
        teacherRolePlaying = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:3"));
        personConformed = this.dimensionAttrRepo.findByIdOrThrow(new Identifier("custom:2"));
        
        assertEquals("Umbenannte Caption", personConformed.caption);
        assertEquals("custom_umbenannte_caption", personConformed.columnname);
        assertEquals("custom_umbenannte_caption_sort_order", personConformed.sortOrderColumn);
        assertNotNull(personConformed.criteriaGroups);
        assertEquals("my description", personConformed.description);
        assertTrue(personConformed.attrConformedId == null);
        assertTrue(personConformed.isHidden.booleanValue());

        assertEquals("Umbenannte Caption", applicantRolePlaying.caption);
        assertEquals("custom_umbenannte_caption", applicantRolePlaying.columnname);
        assertEquals("custom_umbenannte_caption_sort_order", applicantRolePlaying.sortOrderColumn);
        assertEquals("my description", applicantRolePlaying.description);
        assertEquals("custom:2", applicantRolePlaying.attrConformedId);
        assertEquals("dummy_api:6", applicantRolePlaying.dimensionId.composedId);
        assertNotNull(applicantRolePlaying.criteriaGroups);
        assertTrue(!applicantRolePlaying.isHidden.booleanValue());

        assertEquals("Umbenannte Caption", teacherRolePlaying.caption);
        assertEquals("custom_umbenannte_caption", teacherRolePlaying.columnname);
        assertEquals("custom_umbenannte_caption_sort_order", teacherRolePlaying.sortOrderColumn);
        assertEquals("my description", teacherRolePlaying.description);
        assertEquals("custom:2", teacherRolePlaying.attrConformedId);
        assertEquals("dummy_api:3", teacherRolePlaying.dimensionId.composedId);
        assertNotNull(teacherRolePlaying.criteriaGroups);
        assertTrue(teacherRolePlaying.isHidden.booleanValue());

        this.dbMetaAdapter.deleteAttributeGroupById(id);

        assertEquals(0, getCustomAttributes().size());
        assertTrue(!columnExists("presentation", dimension.tablename, "custom_umbenannte_caption"));
        assertTrue(!columnExists("presentation", dimension.tablename, "custom_umbenannte_caption_sort_order"));
        assertTrue(!columnExists("presentation", dimension.tablename, "custom_neue_geburtsjahrgaenge"));
        assertTrue(!columnExists("presentation", dimension.tablename, "custom_neue_geburtsjahrgaenge_sort_order"));
        assertTrue(this.dimensionAttrRepo.findById(attribute.id).isEmpty());
    }

    @Test
    public void testValidation() throws Exception {
       String json = """ 
                 {
                 "caption" : "Altersgruppe",
                 "description": "my description",
                 "criteriaGroups" : [
                     {
                         "caption" : "Unter 18",
                         "conditions" : [
                             { "column" : "age", "operator" : "<", "value" : "25" }
                         ]
                     },
                     {
                         "caption" : "Ab 18 bis 50",
                         "logic" : "AND",
                         "conditions" : [
                             { "column" : "age", "operator" : ">=", "value" : "18" },
                             { "column" : "age", "operator" : "<=", "value" : "50" }
                         ]
                     },
                      {
                         "caption":"n.a",
                         "isElse" : true
                      }
                 ]
                 }
               
               """;

        MvcResult result = mockMvc.perform(put(ATTRIBUTE_GROUP_VALIDATE)
                .contentType(MediaType.APPLICATION_JSON)
                .characterEncoding("UTF-8")
                .param("dimension_id", "app_basic:5")
                .content(json.getBytes(StandardCharsets.UTF_8)))
        .andDo(print())
        .andExpect(status().isOk())
        .andReturn();

        String responseBody = result.getResponse().getContentAsString();
        assertNotNull(responseBody);
        assertTrue(responseBody.length() > 0);
        
        ObjectMapper mapper = new ObjectMapper();
        List<String> stringList = mapper.readValue(responseBody, new TypeReference<List<String>>(){});
        assertTrue(!stringList.isEmpty());
    }

    public String getAttributeJson(String caption, String id) {
        String json = """
                {
                   %s
                   "caption": "%s",
                   "description": "my description",
                   "criteriaGroups":[
                      {
                         "caption":"2001 - 2005",
                         "conditions": [
                             {
                                 "column" : "year_of_birth",
                                 "operator": "IN",
                                 "values": [ "2001", "2002", "2003", "2004", "2005" ]
                             }
                         ]
                      },
                      {
                         "caption":"2006 - 2010",
                         "conditions": [
                             {
                                 "column" : "year_of_birth",
                                 "operator": "IN",
                                 "values": [  "2006", "2007", "2008", "2009"  ]
                             }
                         ]
                      },
                      {
                         "caption":"n.a",
                         "isElse" : true
                      }
                   ]
                }
                """.formatted(id, caption);
        return json;
    }

    private List<AttributeDto> getCustomAttributes() {
        List<AttributeDto> customAttributes = new ArrayList<>();
        for (AttributeDto attributeDto : this.dimensionAttrRepo.findAll()) {
            if(attributeDto.isCustom.booleanValue()) {
               customAttributes.add(attributeDto); 
            }
        }
        return customAttributes;
    }
    
    boolean columnExists(String schema, String tableName, String columnName) throws SQLException {
        DatabaseMetaData meta = dbMetaAdapter.getDataSource().getConnection().getMetaData();
        try (ResultSet rs = meta.getColumns(null, schema, tableName, columnName)) {
            return rs.next();  // true if at least one matching column
        }
    }


}