import React, { useCallback, useEffect, useRef, useState } from 'react';
import {
  View,
  Text,
  Image,
  TouchableOpacity,
  ScrollView,
  KeyboardAvoidingView,
  Platform,
  TouchableWithoutFeedback,
  Keyboard
} from 'react-native';
import { Formik } from 'formik';
import * as yup from 'yup';
import { useNavigation } from '@react-navigation/native';
import { styles } from '../CreateEvent/styles';
import { ButtonVariants } from 'src/types/components';
import ImageView from 'better-react-native-image-viewing';

import { StoreType, storage } from 'src/storage';

import AddImgSvg from 'assets/icons/travels-screens/add-img.svg';
import { Button, CheckBox, Header, Input, PageWrapper, WarningModal } from 'src/components';
import { Colors } from 'src/theme';

import { getFontSize } from 'src/utils';
import { RichEditor, RichToolbar, actions } from 'react-native-pell-rich-editor';
import CalendarSvg from '../../../../../assets/icons/calendar.svg';
import RangeCalendar from 'src/components/Calendars/RangeCalendar';
import {
  usePostAddSharedTripMutation,
  usePostCancelEventMutation,
  usePostGetPhotosForRegionMutation,
  usePostSetFullMutation,
  usePostUpdateEventMutation,
  usePostUpdateSharedTripMutation
} from '@api/events';
import { SheetManager } from 'react-native-actions-sheet';
import PhotosForRegionModal from '../Components/PhotosForRegionModal/PhotosForRegionModal';
import { API_HOST } from 'src/constants';
import AddMapPinModal from '../Components/AddMapPinModal';
import { NAVIGATION_PAGES } from 'src/types';
import TrashSvg from 'assets/icons/travels-screens/trash-solid.svg';
import { useGetRegionsWithFlagQuery } from '@api/regions';

const EventSchema = yup.object({
  title: yup.string().required().min(3),
  start_date: yup.date().nullable().required(),
  end_date: yup.date().nullable().required(),
  tentative: yup.number().optional(),
  photo: yup.number().nullable().optional(),
  details: yup.string().required()
});

const CreateSharedTripScreen = ({ route }: { route: any }) => {
  const eventId = route.params?.eventId;
  const eventData = route.params?.event;
  const token = (storage.get('token', StoreType.STRING) as string) ?? null;
  const navigation = useNavigation();
  const scrollRef = useRef<ScrollView>(null);
  const richText = useRef<RichEditor | null>(null);
  const { mutateAsync: getPhotosForRegion } = usePostGetPhotosForRegionMutation();
  const { mutateAsync: addSharedTrip } = usePostAddSharedTripMutation();
  const { mutateAsync: updateEvent } = usePostUpdateSharedTripMutation();
  const { mutateAsync: cancelEvent } = usePostCancelEventMutation();
  const { mutateAsync: setFull } = usePostSetFullMutation();
  const { data: regionslist } = useGetRegionsWithFlagQuery(true);

  const [isSubmitting, setIsSubmitting] = useState(false);
  const [calendarVisible, setCalendarVisible] = useState<'start_date' | 'end_date' | null>(null);
  const [isViewerVisible, setIsViewerVisible] = useState(false);
  const [photos, setPhotos] = useState<any[]>([]);
  const [regions, setRegions] = useState<any[]>(route.params?.regionsToSave ?? []);
  const [regionsError, setRegionsError] = useState<string | null>(null);
  const [photosError, setPhotosError] = useState<string | null>(null);

  useEffect(() => {
    if (route.params?.regionsToSave) {
      setRegions(route.params.regionsToSave);
    }
  }, [route.params?.regionsToSave]);

  useEffect(() => {
    if (regions && regions.length > 0) {
      handleGetPhotosForAllRegions(regions);
    } else {
      setPhotos([]);
    }
  }, [regions]);

  const handleGetPhotosForAllRegions = useCallback(
    async (regionsArray: any[]) => {
      if (!regionsArray || regionsArray.length === 0) {
        setPhotos([]);
        return;
      }

      const allPhotos: any[] = [];

      try {
        for (const region of regionsArray) {
          await getPhotosForRegion(
            { region_id: region.id },
            {
              onSuccess: (res) => {
                if (res.photos && res.photos.length > 0) {
                  allPhotos.push(...res.photos);
                }
              },
              onError: (error) => {
                console.log(`Error loading photos for region ${region.id}:`, error);
              }
            }
          );
        }

        setPhotos(allPhotos);
      } catch (error) {
        setPhotos([]);
      }
    },
    [getPhotosForRegion, token]
  );

  const initialData: any = {
    title: eventData?.title ?? '',
    start_date: eventData?.date_from ?? '',
    end_date: eventData?.date_to ?? '',
    tentative: eventData?.date_tentative ?? 0,
    photo: null,
    details: eventData?.details ?? ''
  };

  const [modalInfo, setModalInfo] = useState({
    visible: false,
    type: 'success',
    title: '',
    message: '',
    buttonTitle: 'OK',
    action: () => {}
  });

  useEffect(() => {
    if (eventData && eventData.regions && regionslist && regionslist.data) {
      const parsedRegions = JSON.parse(eventData.regions);
      let regionsData: any = [];
      parsedRegions.forEach((region: any) => {
        const regionWithFlag = regionslist.data?.find((r: any) => r.id === +region);
        regionsData.push({
          flag1: regionWithFlag?.flag ?? '',
          flag2: null,
          region_name: regionWithFlag?.name ?? '',
          id: regionWithFlag?.id ?? region.id
        });
      });
      setRegions(regionsData);
    }
  }, [eventData, regionslist]);

  const handleCancelTrip = () => {
    setModalInfo({
      visible: true,
      type: 'delete',
      title: 'Cancel trip',
      buttonTitle: 'Cancel',
      message: `Are you sure you want to cancel this trip?`,
      action: () => {
        cancelEvent(
          { token, event_id: eventId },
          {
            onSuccess: (res) => {
              navigation.navigate(NAVIGATION_PAGES.EVENTS as never);
            }
          }
        );
      }
    });
  };

  const handleDeleteRegion = (regionId: number) => {
    regions && setRegions(regions.filter((region) => region.id !== regionId));
  };

  return (
    <PageWrapper>
      <Header label="Add trip" />

      <KeyboardAvoidingView
        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
        style={{ flex: 1 }}
      >
        <TouchableWithoutFeedback onPress={Keyboard.dismiss} accessible={false}>
          <ScrollView ref={scrollRef} showsVerticalScrollIndicator={false}>
            <Formik
              validationSchema={EventSchema}
              initialValues={initialData}
              onSubmit={async (values) => {
                if (regions.length === 0) {
                  return;
                }
                if (photos.length > 0 && !values.photo) {
                  return;
                }
                setIsSubmitting(true);

                const regionsToSave = regions.map((region) => region.id);

                const newTrip: any = {
                  title: values.title,
                  start_date: values.start_date,
                  end_date: values.end_date,
                  tentative: values.tentative,
                  regions: regionsToSave,
                  details: values.details
                };

                if (values.photo) {
                  newTrip.photo = values.photo;
                }

                if (eventId) {
                  await updateEvent(
                    { token, trip_id: eventId, trip: JSON.stringify(newTrip) },
                    {
                      onSuccess: (res) => {
                        setIsSubmitting(false);
                        navigation.goBack();
                      },
                      onError: (err) => {
                        setIsSubmitting(false);
                      }
                    }
                  );
                } else {
                  await addSharedTrip(
                    { token, trip: JSON.stringify(newTrip) },
                    {
                      onSuccess: (res) => {
                        setIsSubmitting(false);
                        setModalInfo({
                          visible: true,
                          type: 'success',
                          title: 'Success',
                          buttonTitle: 'OK',
                          message: `Thank you for adding this new trip. It will undergo review soon. You'll be notified via email once it is approved.`,
                          action: () => {}
                        });
                      },
                      onError: (err) => {
                        setIsSubmitting(false);
                      }
                    }
                  );
                }
              }}
            >
              {(props) => (
                <View style={{ gap: 12 }}>
                  <Input
                    header={'Trip name'}
                    placeholder={'Add trip name'}
                    inputMode={'text'}
                    onChange={props.handleChange('title')}
                    value={props.values.title}
                    onBlur={props.handleBlur('title')}
                    formikError={props.touched.title && (props.errors.title as string)}
                  />

                  <View style={{ flexDirection: 'row', gap: 8 }}>
                    <View style={{ flex: 1 }}>
                      <Input
                        header={'From'}
                        placeholder={'Add start date'}
                        inputMode={'none'}
                        onChange={props.handleChange('start_date')}
                        value={props.values.start_date}
                        onBlur={props.handleBlur('start_date')}
                        isFocused={() => setCalendarVisible('start_date')}
                        formikError={
                          props.touched.start_date && (props.errors.start_date as string)
                        }
                        icon={<CalendarSvg fill={Colors.LIGHT_GRAY} width={20} height={20} />}
                      />
                    </View>

                    <View style={{ flex: 1 }}>
                      <Input
                        header={'To'}
                        placeholder={'Add end date'}
                        inputMode={'none'}
                        onChange={props.handleChange('end_date')}
                        value={props.values.end_date}
                        onBlur={props.handleBlur('end_date')}
                        isFocused={() => setCalendarVisible('end_date')}
                        formikError={props.touched.end_date && (props.errors.end_date as string)}
                        icon={<CalendarSvg fill={Colors.LIGHT_GRAY} width={20} height={20} />}
                      />
                    </View>
                  </View>

                  <TouchableOpacity
                    onPress={() => {
                      props.setFieldValue('tentative', props.values.tentative === 1 ? 0 : 1);
                    }}
                    style={styles.optionBtn}
                    hitSlop={{ top: 10, bottom: 10, left: 10, right: 10 }}
                  >
                    <Text style={styles.optionText}>Tentative dates</Text>
                    <CheckBox
                      onChange={() => {
                        props.setFieldValue('tentative', props.values.tentative === 1 ? 0 : 1);
                      }}
                      value={props.values.tentative === 1}
                      color={Colors.DARK_BLUE}
                    />
                  </TouchableOpacity>

                  <View>
                    <Text
                      style={{
                        color: Colors.DARK_BLUE,
                        fontSize: getFontSize(14),
                        fontFamily: 'redhat-700',
                        marginBottom: 8
                      }}
                    >
                      NomadMania regions
                    </Text>

                    <TouchableOpacity
                      style={styles.addRegionBtn}
                      onPress={() =>
                        navigation.navigate(
                          ...([
                            NAVIGATION_PAGES.ADD_REGIONS,
                            { regionsParams: regions, editId: eventId, isSharedTrip: true }
                          ] as never)
                        )
                      }
                    >
                      <Text style={styles.addRegionBtntext}>Add Region</Text>
                    </TouchableOpacity>

                    {regions && regions.length ? (
                      <View style={styles.regionsContainer}>
                        {regions.map((region) => {
                          const [name, ...rest] = region.region_name?.split(/ – | - /);
                          const subname = rest?.join(' - ');

                          return (
                            <View key={region.id} style={styles.regionItem}>
                              <View style={styles.regionHeader}>
                                <Image
                                  source={{ uri: `${API_HOST}/img/flags_new/${region.flag1}` }}
                                  style={styles.flagStyle}
                                />
                                {region.flag2 && (
                                  <Image
                                    source={{
                                      uri: `${API_HOST}/img/flags_new/${region.flag2}`
                                    }}
                                    style={[styles.flagStyle, { marginLeft: -17 }]}
                                  />
                                )}
                                <View style={styles.nameContainer}>
                                  <Text style={styles.regionName}>{name}</Text>
                                  <Text style={styles.regionSubname}>{subname}</Text>
                                </View>
                              </View>
                              <TouchableOpacity
                                style={styles.trashBtn}
                                onPress={() => handleDeleteRegion(region.id)}
                              >
                                <TrashSvg fill={Colors.WHITE} />
                              </TouchableOpacity>
                            </View>
                          );
                        })}
                      </View>
                    ) : regionsError ? (
                      <Text
                        style={{
                          color: Colors.RED,
                          fontSize: getFontSize(12),
                          fontFamily: 'redhat-600',
                          marginTop: 5
                        }}
                      >
                        {regionsError}
                      </Text>
                    ) : (
                      <Text style={styles.noRegiosText}>No regions at the moment</Text>
                    )}
                  </View>

                  {regions && regions.length > 0 && photos.length > 0 ? (
                    <Input
                      header={'Photo'}
                      placeholder={props.values.photo ? 'Photo selected' : 'Choose a photo'}
                      inputMode={'none'}
                      onBlur={props.handleBlur('photo')}
                      isFocused={() =>
                        SheetManager.show('photos-for-region-modal', {
                          payload: {
                            photos,
                            selectPhoto: (photo: any) => {
                              props.setFieldValue('photo', photo);
                              setPhotosError(null);
                            }
                          } as any
                        })
                      }
                      formikError={props.touched.photo && (props.errors.photo as string)}
                      icon={<AddImgSvg fill={Colors.LIGHT_GRAY} width={20} height={20} />}
                    />
                  ) : null}

                  {props.values.photo ? (
                    <View
                      style={{
                        display: 'flex',
                        justifyContent: 'center',
                        alignItems: 'center',
                        gap: 8
                      }}
                    >
                      <TouchableOpacity
                        style={{ width: '100%' }}
                        onPress={async () => setIsViewerVisible(true)}
                      >
                        <Image
                          source={{ uri: `${API_HOST}/webapi/photos/${props.values.photo}/small` }}
                          style={{ width: '100%', height: 200, borderRadius: 4 }}
                        />
                      </TouchableOpacity>
                    </View>
                  ) : null}

                  {photosError ? (
                    <Text
                      style={{
                        color: Colors.RED,
                        fontSize: getFontSize(12),
                        fontFamily: 'redhat-600',
                        marginTop: -5
                      }}
                    >
                      {photosError}
                    </Text>
                  ) : null}

                  <View>
                    <Text
                      style={{
                        color: Colors.DARK_BLUE,
                        fontSize: getFontSize(14),
                        fontFamily: 'redhat-700',
                        marginBottom: 8
                      }}
                    >
                      Details
                    </Text>
                    <RichToolbar
                      editor={richText}
                      selectedButtonStyle={{ backgroundColor: Colors.LIGHT_GRAY }}
                      style={[
                        {
                          borderTopLeftRadius: 4,
                          borderTopRightRadius: 4,
                          backgroundColor: Colors.FILL_LIGHT
                        },
                        props.touched.details && props.errors.details
                          ? {
                              borderTopColor: Colors.RED,
                              borderLeftColor: Colors.RED,
                              borderRightColor: Colors.RED,
                              borderWidth: 1,
                              borderBottomWidth: 0
                            }
                          : {}
                      ]}
                      actions={[
                        actions.keyboard,
                        actions.setBold,
                        actions.setItalic,
                        actions.setUnderline,
                        actions.alignLeft,
                        actions.alignCenter,
                        actions.alignRight,
                        actions.alignFull,
                        actions.insertLink,
                        actions.insertBulletsList,
                        actions.insertOrderedList,
                        actions.setStrikethrough,
                        actions.indent,
                        actions.outdent,
                        actions.undo,
                        actions.redo,
                        actions.blockquote,
                        actions.insertLine
                      ]}
                    />

                    <RichEditor
                      ref={richText}
                      initialHeight={100}
                      onFocus={() => {
                        scrollRef.current?.scrollTo({
                          y: 650,
                          animated: true
                        });
                      }}
                      placeholder="Add trip details"
                      initialContentHTML={props.values.details}
                      onChange={props.handleChange('details')}
                      editorStyle={{
                        contentCSSText: 'font-size: 14px; padding: 12px; color: #C8C8C8;',
                        backgroundColor: Colors.FILL_LIGHT,
                        color: Colors.DARK_BLUE
                      }}
                      style={[
                        {
                          minHeight: 100,
                          borderBottomLeftRadius: 4,
                          borderBottomRightRadius: 4
                        },
                        props.touched.details && props.errors.details
                          ? {
                              borderBottomColor: Colors.RED,
                              borderLeftColor: Colors.RED,
                              borderRightColor: Colors.RED,
                              borderWidth: 1,
                              borderTopWidth: 0
                            }
                          : {}
                      ]}
                      onBlur={() => props.handleBlur('details')}
                    />
                    {props.touched.details && props.errors.details ? (
                      <Text
                        style={{
                          color: Colors.RED,
                          fontSize: getFontSize(12),
                          fontFamily: 'redhat-600',
                          marginTop: 5
                        }}
                      >
                        {props.errors.details as string}
                      </Text>
                    ) : null}
                  </View>

                  {eventId ? (
                    <View style={{ marginTop: 15, marginBottom: 15, gap: 8 }}>
                      <Button
                        onPress={() => {
                          if (regions.length === 0) {
                            setRegionsError('please add at least one region');
                          } else {
                            setRegionsError(null);
                          }

                          if (photos.length > 0 && !props.values.photo) {
                            setPhotosError('please select a photo');
                          } else {
                            setPhotosError(null);
                          }
                          props.handleSubmit();
                        }}
                        disabled={isSubmitting}
                      >
                        Update trip
                      </Button>

                      <Button
                        variant={ButtonVariants.OPACITY}
                        containerStyles={{
                          backgroundColor: Colors.WHITE,
                          borderColor: Colors.BORDER_LIGHT
                        }}
                        textStyles={{ color: Colors.DARK_BLUE }}
                        onPress={async () => {
                          await setFull({ token, id: eventId, full: 1 });
                          navigation.goBack();
                        }}
                      >
                        Set Full
                      </Button>

                      <Button
                        variant={ButtonVariants.OPACITY}
                        containerStyles={{
                          backgroundColor: Colors.RED,
                          borderColor: Colors.RED
                        }}
                        textStyles={{ color: Colors.WHITE }}
                        onPress={handleCancelTrip}
                      >
                        Cancel trip
                      </Button>
                    </View>
                  ) : (
                    <View style={{ marginTop: 15, marginBottom: 15, gap: 8 }}>
                      <Button
                        onPress={() => {
                          if (regions.length === 0) {
                            setRegionsError('please add at least one region');
                          } else {
                            setRegionsError(null);
                          }

                          if (photos.length > 0 && !props.values.photo) {
                            setPhotosError('please select a photo');
                          } else {
                            setPhotosError(null);
                          }
                          props.handleSubmit();
                        }}
                        disabled={isSubmitting}
                      >
                        Save
                      </Button>

                      <Button
                        variant={ButtonVariants.OPACITY}
                        containerStyles={{
                          backgroundColor: Colors.WHITE,
                          borderColor: Colors.BORDER_LIGHT
                        }}
                        textStyles={{ color: Colors.DARK_BLUE }}
                        onPress={() => navigation.goBack()}
                      >
                        Cancel
                      </Button>
                    </View>
                  )}

                  <RangeCalendar
                    isModalVisible={calendarVisible ? true : false}
                    closeModal={(startDate?: string | null, endDate?: string | null) => {
                      startDate && props.handleChange(calendarVisible)(startDate.toString());
                      setCalendarVisible(null);
                    }}
                    allowRangeSelection={false}
                    selectedDate={props.values[calendarVisible ?? 'start_date']}
                    disablePastDates={true}
                  />
                  <ImageView
                    images={[
                      {
                        uri: `${API_HOST}/webapi/photos/${props.values.photo}/full`
                      }
                    ]}
                    keyExtractor={(imageSrc, index) => index.toString()}
                    imageIndex={0}
                    visible={isViewerVisible}
                    onRequestClose={() => setIsViewerVisible(false)}
                    swipeToCloseEnabled={false}
                    backgroundColor={Colors.DARK_BLUE}
                  />
                </View>
              )}
            </Formik>
          </ScrollView>
        </TouchableWithoutFeedback>
      </KeyboardAvoidingView>
      <PhotosForRegionModal />
      <AddMapPinModal />
      <WarningModal
        type={modalInfo.type}
        isVisible={modalInfo.visible}
        buttonTitle={modalInfo.buttonTitle}
        message={modalInfo.message}
        action={modalInfo.action}
        onClose={() => {
          if (modalInfo.type === 'success') {
            navigation.goBack();
            setModalInfo({ ...modalInfo, visible: false });
          } else {
            setModalInfo({ ...modalInfo, visible: false });
          }
        }}
        title={modalInfo.title}
      />
    </PageWrapper>
  );
};

export default CreateSharedTripScreen;