From e4eb6e84fbd16201dd0575928002a37bc1dace40 Mon Sep 17 00:00:00 2001
From: Sergey Yarkov <serzh.yarkov@gmail.com>
Date: Tue, 21 Dec 2021 00:30:33 +0300
Subject: [PATCH] feat: updated lesson page layout & fethcing lessons

---
 .../queries/course/useFetchCourseLessons.ts   |  21 +++
 src/pages/course/course.tsx                   |   4 +
 src/pages/lesson/lesson.tsx                   | 136 ++++++++++++++----
 src/services/CourseService.ts                 |  13 +-
 4 files changed, 146 insertions(+), 28 deletions(-)
 create mode 100644 src/hooks/queries/course/useFetchCourseLessons.ts

diff --git a/src/hooks/queries/course/useFetchCourseLessons.ts b/src/hooks/queries/course/useFetchCourseLessons.ts
new file mode 100644
index 0000000..644102f
--- /dev/null
+++ b/src/hooks/queries/course/useFetchCourseLessons.ts
@@ -0,0 +1,21 @@
+import useAsync from '@educt/hooks/useAsync';
+import { ILesson } from '@educt/interfaces';
+import { CourseServiceInstance } from '@educt/services';
+
+const useFetchCourseLessons = () => {
+  const fetch = async (id: string) => {
+    try {
+      const { data } = await CourseServiceInstance.fetchLessonsById(id);
+      return data;
+    } catch (error) {
+      console.error(error);
+      return Promise.reject(error);
+    }
+  };
+
+  const { execute, ...state } = useAsync<Array<ILesson>, Parameters<typeof fetch>>(fetch);
+
+  return { fetchCourseLessons: execute, ...state };
+};
+
+export { useFetchCourseLessons };
diff --git a/src/pages/course/course.tsx b/src/pages/course/course.tsx
index a35d6a1..2bab4df 100644
--- a/src/pages/course/course.tsx
+++ b/src/pages/course/course.tsx
@@ -24,6 +24,7 @@ import LoadingPage from '@educt/components/LoadingPage';
 import { useHistory, useParams } from 'react-router-dom';
 import { useFetchCourse } from '@educt/hooks/queries';
 import { useRootStore } from '@educt/hooks/useRootStore';
+import { Helmet } from 'react-helmet';
 
 const CoursePage: React.FC<IPageProps> = () => {
   const {
@@ -47,6 +48,9 @@ const CoursePage: React.FC<IPageProps> = () => {
 
   return (
     <PageWrapper maxW='1200px'>
+      <Helmet>
+        <title>{course.title}</title>
+      </Helmet>
       <CourseHeader>
         <CourseHeading title={course.title} teacher={course.teacher} category={course.category} />
         <CourseInfo
diff --git a/src/pages/lesson/lesson.tsx b/src/pages/lesson/lesson.tsx
index 053cee2..ef9cdd0 100644
--- a/src/pages/lesson/lesson.tsx
+++ b/src/pages/lesson/lesson.tsx
@@ -1,11 +1,27 @@
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import moment from 'moment';
-import { Flex, Box, Button, Divider, Heading, Text, Grid, GridItem, Stack, Icon, IconButton } from '@chakra-ui/react';
+import { Link as ReactRouterLink, useHistory } from 'react-router-dom';
+import {
+  Flex,
+  Box,
+  Button,
+  Divider,
+  Heading,
+  Text,
+  Grid,
+  LinkBox,
+  LinkOverlay,
+  GridItem,
+  Stack,
+  Icon,
+  IconButton,
+  useToast,
+} from '@chakra-ui/react';
 
 /**
  * Types
  */
-import { IPageProps } from '@educt/interfaces';
+import { ILesson, IPageProps } from '@educt/interfaces';
 
 /**
  * Hooks
@@ -14,7 +30,10 @@ import { Redirect, useParams } from 'react-router-dom';
 import { PageContent, PageHeading, PageWrapper } from '@educt/components/PageElements';
 import { useFetchLesson } from '@educt/hooks/queries/lesson/useFetchLesson';
 import LoadingPage from '@educt/components/LoadingPage';
-import { MdCheckCircle, MdOutlineFilePresent, MdSkipNext, MdSkipPrevious } from 'react-icons/md';
+import { MdCheckCircle, MdOutlineCircle, MdOutlineFilePresent, MdSkipNext, MdSkipPrevious } from 'react-icons/md';
+import { useRootStore } from '@educt/hooks/useRootStore';
+import { Helmet } from 'react-helmet';
+import { useFetchCourseLessons } from '@educt/hooks/queries/course/useFetchCourseLessons';
 
 /**
  * Lesson Page
@@ -22,32 +41,87 @@ import { MdCheckCircle, MdOutlineFilePresent, MdSkipNext, MdSkipPrevious } from
 const LessonPage: React.FC<IPageProps> = () => {
   const { id } = useParams<{ id: string }>();
   const { error, data: lesson, isLoading } = useFetchLesson(id);
+  const { fetchCourseLessons, data: lessons } = useFetchCourseLessons();
+  const toast = useToast();
+  const history = useHistory();
+  const {
+    userStore: { me },
+  } = useRootStore();
+  const [nextLesson, setNextLesson] = useState<ILesson | null>(null);
+  const [prevLesson, setPrevLesson] = useState<ILesson | null>(null);
+  const [isPageAvailable, setIsPageAvailable] = useState<boolean>(true);
+
+  useEffect(() => {
+    /**
+     * Сheck if the user has access to the lesson
+     */
+    const isHasAccess = me?.courses?.some(course => course.id === lesson?.course_id) ?? true;
+
+    if (!isHasAccess) {
+      toast({ title: 'You are not able to view this lesson.', status: 'warning' });
+      setIsPageAvailable(false);
+    }
+
+    /**
+     * Define next and prev lessons
+     */
+    if (lessons) {
+      const currentLessonIndex = lessons.findIndex(lesson => lesson.id === id);
+
+      setNextLesson(lessons[currentLessonIndex + 1] || null);
+      setPrevLesson(lessons[currentLessonIndex - 1] || null);
+    }
+  }, [lessons]);
+
+  useEffect(() => {
+    if (lesson !== null) {
+      fetchCourseLessons(lesson.course_id);
+    }
+  }, [lesson]);
 
   if (error?.response?.status === 404) {
     return <Redirect to='/404' />;
   }
 
-  if (!lesson || isLoading) return <LoadingPage />;
+  if (!lesson || !lessons || isLoading) return <LoadingPage />;
+
+  if (!isPageAvailable) return <Redirect to={`/course/${lesson.course_id}`} />;
+
+  const handleNextLesson = () => nextLesson && history.push(`/lesson/${nextLesson.id}`);
+  const handlePrevLesson = () => prevLesson && history.push(`/lesson/${prevLesson.id}`);
 
   return (
     <PageWrapper>
+      <Helmet>
+        <title>{lesson.title}</title>
+      </Helmet>
       <PageHeading heading={lesson.title}>
         <Box mt='3'>
           <Text fontSize={'sm'}>~{moment.duration(lesson.duration, 'minutes').humanize()}</Text>
         </Box>
       </PageHeading>
       <PageContent>
-        <Grid templateColumns={{ base: '1fr', xl: '3fr 1fr' }} gap={'7'}>
+        <Grid templateColumns={{ base: '1fr', xl: '3fr 1fr' }}>
           <GridItem>
             <Box>
               <Box bg={lesson.color?.hex} minH={'500px'} />
             </Box>
 
             <Flex justifyContent={'flex-end'} mt='3'>
-              <IconButton aria-label='prev-lesson' icon={<MdSkipPrevious />} size='sm' mr='2' />
-              <Button aria-label='next-lesson' leftIcon={<MdSkipNext />} size='sm'>
-                Next lesson
-              </Button>
+              {prevLesson && (
+                <IconButton
+                  onClick={handlePrevLesson}
+                  aria-label='prev-lesson'
+                  icon={<MdSkipPrevious />}
+                  size='sm'
+                  mr='2'
+                />
+              )}
+              {nextLesson && (
+                <Button onClick={handleNextLesson} aria-label='next-lesson' leftIcon={<MdSkipNext />} size='sm'>
+                  Next lesson
+                </Button>
+              )}
             </Flex>
 
             <Box mt='7'>
@@ -61,27 +135,35 @@ const LessonPage: React.FC<IPageProps> = () => {
           </GridItem>
           <GridItem>
             <Box>
-              <Stack maxH={'445px'} overflowY={'scroll'}>
-                {Array(50)
-                  .fill(1)
-                  .map((n, i) => (
-                    <Flex key={i} alignItems={'center'} borderRadius={'xl'}>
-                      <Icon as={MdCheckCircle} color='green.500' w={7} h={7} mr='2' />
-                      <Box>
-                        <Text as='small' color='gray.500'>
-                          Lesson {i + 1}
-                        </Text>
+              <Stack maxH={'500px'} overflowY={'scroll'} spacing={'0'}>
+                {lessons.map((lesson, i) => (
+                  <LinkBox
+                    as='div'
+                    display={'flex'}
+                    key={lesson.id}
+                    bg={lesson.id === id ? 'gray.50' : ''}
+                    p='4'
+                    alignItems={'center'}
+                    _hover={{
+                      bg: 'gray.50',
+                    }}
+                  >
+                    <Icon as={MdOutlineCircle} color='gray.500' w={6} h={6} mr='2' />
+                    <Box>
+                      <Text as='small' color='gray.500'>
+                        Lesson {i + 1}
+                      </Text>
+                      <LinkOverlay as={ReactRouterLink} to={`/lesson/${lesson.id}`}>
                         <Text fontSize='sm' fontWeight={'medium'}>
-                          Lorem ipsum dolor sit amet consectetur adipisicing elit. Vel, eaque.
+                          {lesson.title}
                         </Text>
-                      </Box>
-                    </Flex>
-                  ))}
+                      </LinkOverlay>
+                    </Box>
+                  </LinkBox>
+                ))}
               </Stack>
 
-              <Divider mt='5' mb='5' />
-
-              <Box>
+              <Box p='5'>
                 <Text fontSize={'2xl'} fontWeight={'medium'}>
                   Materials
                 </Text>
diff --git a/src/services/CourseService.ts b/src/services/CourseService.ts
index 82cad95..beb7fd4 100644
--- a/src/services/CourseService.ts
+++ b/src/services/CourseService.ts
@@ -1,7 +1,7 @@
 import { AxiosInstance } from 'axios';
 import { ApiServiceInstance } from '.';
 import * as helpers from '@educt/helpers';
-import { IApiRespose, ICourse, IUser } from '@educt/interfaces';
+import { IApiRespose, ICourse, ILesson, IUser } from '@educt/interfaces';
 import { CourseStatusEnum } from '@educt/enums';
 import { CreateCourseParamsType, FetchCoursesParams, UpdateCourseParamsType } from '@educt/types';
 
@@ -40,6 +40,17 @@ class CourseService {
     return result.data;
   }
 
+  /**
+   * Fetch lessons by course id
+   *
+   * @param id Course id
+   * @returns Array of lessons
+   */
+  public async fetchLessonsById(id: string): Promise<IApiRespose<Array<ILesson>>> {
+    const result = await this.api.get(`/v1/courses/${id}/lessons`);
+    return result.data;
+  }
+
   /**
    * Update status of course by id
    *