package ru.soune.nocopy.adminpanel.handler;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import ru.soune.nocopy.adminpanel.dto.*;
import ru.soune.nocopy.adminpanel.entity.AdminCreateTemplate;
import ru.soune.nocopy.adminpanel.service.AdminCreateTemplateService;
import ru.soune.nocopy.adminpanel.util.MessageCode;

import java.util.Arrays;
import java.util.List;
import java.util.Map;

@Component
@RequiredArgsConstructor
@Slf4j
public class CreateAdminTemplateHandler implements RequestHandler {

    private final ObjectMapper objectMapper;

    private final AdminCreateTemplateService adminCreateTemplateService;

    @Override
    public BaseResponse handle(BaseRequest request) {
        AdminCreateTemplateRequest adminCreateTemplateRequest = objectMapper.convertValue(request.getMessageBody(),
                AdminCreateTemplateRequest.class);
        String action = adminCreateTemplateRequest.getAction();

        return switch (action) {
            case "create" -> handleCreate(request, adminCreateTemplateRequest);
            case "update" -> handleUpdate(request, adminCreateTemplateRequest);
            case "delete" -> handleDelete(request, adminCreateTemplateRequest);
            case "get_all" -> handleGetAll(request);
            case "get_by_id" -> handleGetById(request, adminCreateTemplateRequest);
            default -> handleInvalidAction(request, action);
        };
    }

    private BaseResponse handleDelete(BaseRequest request, AdminCreateTemplateRequest adminCreateTemplateRequest) {
        Long adminCreateTemplateRequestId = adminCreateTemplateRequest.getId();

        if (adminCreateTemplateRequestId == null || adminCreateTemplateService.existById(adminCreateTemplateRequestId)) {
            return BaseResponse.builder()
                    .msgId(request.getMsgId())
                    .messageCode(MessageCode.TEMPLATE_NOT_FOUND.getCode())
                    .messageDesc(MessageCode.TEMPLATE_NOT_FOUND.getDescription())
                    .messageBody(Map.of("id", adminCreateTemplateRequest.getId()))
                    .build();
        }

        adminCreateTemplateService.deleteTemplate(adminCreateTemplateRequestId);


        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.SUCCESS.getCode())
                .messageDesc(MessageCode.SUCCESS.getDescription())
                .messageBody(Map.of("id", adminCreateTemplateRequestId))
                .build();
    }

    private BaseResponse handleUpdate(BaseRequest request, AdminCreateTemplateRequest adminCreateTemplateRequest) {
        Map<String, Integer> permissionsMap = adminCreateTemplateRequest.getPermissions();

        if (permissionsMap == null || permissionsMap.isEmpty()) {
            return BaseResponse.builder()
                    .msgId(request.getMsgId())
                    .messageCode(MessageCode.TEMPLATE_NOT_FOUND.getCode())
                    .messageDesc(MessageCode.TEMPLATE_NOT_FOUND.getDescription())
                    .messageBody(Map.of("id", adminCreateTemplateRequest.getId()))
                    .build();
        }

        ObjectNode node = objectMapper.createObjectNode();

        for (Map.Entry<String, Integer> entry: permissionsMap.entrySet()) {
            node.put(entry.getKey(), entry.getValue());
        }

        Boolean changePassword = adminCreateTemplateRequest.getChangePassword();

        AdminCreateTemplate adminTemplate =
                adminCreateTemplateService.updateCreateTemplate(node.toString(), changePassword,
                        adminCreateTemplateRequest.getId(), adminCreateTemplateRequest.getName());

        if (adminTemplate == null) {
            return BaseResponse.builder()
                    .msgId(request.getMsgId())
                    .messageCode(MessageCode.TEMPLATE_NOT_FOUND.getCode())
                    .messageDesc(MessageCode.TEMPLATE_NOT_FOUND.getDescription())
                    .messageBody(Map.of("id", adminCreateTemplateRequest.getId()))
                    .build();
        }

        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.SUCCESS.getCode())
                .messageDesc(MessageCode.SUCCESS.getDescription())
                .messageBody(convertToResponse(adminTemplate))
                .build();
    }

    private BaseResponse handleCreate(BaseRequest request, AdminCreateTemplateRequest adminCreateTemplateRequest) {
        Map<String, Integer> permissionsMap = adminCreateTemplateRequest.getPermissions();

        if (permissionsMap == null || permissionsMap.isEmpty()) {
            return BaseResponse.builder()
                    .msgId(request.getMsgId())
                    .messageCode(MessageCode.PERMISSION_IS_EMPTY.getCode())
                    .messageDesc("Permissions map is required")
                    .build();
        }

        ObjectNode node = objectMapper.createObjectNode();

        for (Map.Entry<String, Integer> entry: permissionsMap.entrySet()) {
            node.put(entry.getKey(), entry.getValue());
        }

        Boolean changePassword = adminCreateTemplateRequest.getChangePassword();

        AdminCreateTemplate adminTemplate =
                adminCreateTemplateService.createAdminTemplate(node.toString(), changePassword,
                        adminCreateTemplateRequest.getName());


        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.SUCCESS.getCode())
                .messageDesc(MessageCode.SUCCESS.getDescription())
                .messageBody(convertToResponse(adminTemplate))
                .build();
    }

    private BaseResponse handleGetAll(BaseRequest request) {
        List<AdminCreateTemplateResponse> templateResponses = adminCreateTemplateService.getAllTemplates()
                .stream()
                .map(this::convertToResponse)
                .toList();

        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.SUCCESS.getCode())
                .messageDesc(MessageCode.SUCCESS.getDescription())
                .messageBody(templateResponses)
                .build();
    }

    private BaseResponse handleGetById(BaseRequest request, AdminCreateTemplateRequest adminCreateTemplateRequest) {
        Long id = adminCreateTemplateRequest.getId();

        if (id == null || !adminCreateTemplateService.existById(id)) {
            return BaseResponse.builder()
                    .msgId(request.getMsgId())
                    .messageCode(MessageCode.TEMPLATE_NOT_FOUND.getCode())
                    .messageDesc(MessageCode.TEMPLATE_NOT_FOUND.getDescription())
                    .messageBody(Map.of("id", adminCreateTemplateRequest.getId()))
                    .build();
        }

        AdminCreateTemplate template = adminCreateTemplateService.getTemplateById(adminCreateTemplateRequest.getId());

        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.SUCCESS.getCode())
                .messageDesc(MessageCode.SUCCESS.getDescription())
                .messageBody(convertToResponse(template))
                .build();
    }

    private BaseResponse handleInvalidAction(BaseRequest request, String action) {
        ActionResponse response = ActionResponse.builder()
                .action(action)
                .availableActions(Arrays.asList("create", "update", "delete", "get_all", "get_by_id"))
                .build();

        return BaseResponse.builder()
                .msgId(request.getMsgId())
                .messageCode(MessageCode.INVALID_ACTION.getCode())
                .messageDesc(MessageCode.INVALID_ACTION.getDescription())
                .messageBody(response)
                .build();
    }

    private AdminCreateTemplateResponse convertToResponse(AdminCreateTemplate adminTemplate) {
        Map<String, Integer> permissionsMap = null;
        try {
            permissionsMap = objectMapper.readValue(
                    adminTemplate.getPermission(),
                    new TypeReference<Map<String, Integer>>() {}
            );
        } catch (Exception e) {
            log.error("Failed to parse permissions", e);
        }

        return AdminCreateTemplateResponse.builder()
                .id(adminTemplate.getId())
                .changePassword(adminTemplate.getChangePassword())
                .permissions(permissionsMap)
                .name(adminTemplate.getName())
                .build();
    }
}