import { Text, Fieldset, Spacer, Link } from '@geist-ui/core'
import { Post, User } from '@lib/types'
import Cookies from 'js-cookie'
import { useEffect, useState } from 'react'
import useSWR from 'swr'
import styles from './admin.module.css'
import PostModal from './post-modal-link'

export const adminFetcher = (url: string) => fetch(url, {
    method: "GET",
    headers: {
        "Content-Type": "application/json",
        "Authorization": `Bearer ${Cookies.get('drift-token')}`,
    }
}).then(res => res.json())

const Admin = () => {
    const { data: posts, error: postsError } = useSWR<Post[]>('/server-api/admin/posts', adminFetcher)
    const { data: users, error: usersError } = useSWR<User[]>('/server-api/admin/users', adminFetcher)
    const [postSizes, setPostSizes] = useState<{ [key: string]: number }>({})
    const byteToMB = (bytes: number) => Math.round(bytes / 1024 / 1024 * 100) / 100
    useEffect(() => {
        if (posts) {
            // sum the sizes of each file per post
            const sizes = posts.reduce((acc, post) => {
                const size = post.files.reduce((acc, file) => acc + file.html.length, 0)
                return { ...acc, [post.id]: byteToMB(size) }
            }, {})
            setPostSizes(sizes)
        }
    }, [posts])

    return (
        <div className={styles.adminWrapper}>
            <Text h2>Administration</Text>
            <Fieldset>
                <Fieldset.Title>Users</Fieldset.Title>
                {users && <Fieldset.Subtitle>{users.length} users</Fieldset.Subtitle>}
                {!users && <Fieldset.Subtitle>Loading...</Fieldset.Subtitle>}
                {usersError && <Fieldset.Subtitle>An error occured</Fieldset.Subtitle>}
                {users && <table>
                    <thead>
                        <tr>
                            <th>Username</th>
                            <th>Posts</th>
                            <th>Created</th>
                            <th>Role</th>
                        </tr>
                    </thead>
                    <tbody>
                        {users?.map(user => (
                            <tr key={user.id}>
                                <td>{user.username}</td>
                                <td>{user.posts?.length}</td>
                                <td>{new Date(user.createdAt).toLocaleDateString()} {new Date(user.createdAt).toLocaleTimeString()}</td>
                                <td>{user.role}</td>
                            </tr>
                        ))}
                    </tbody>
                </table>}

            </Fieldset>
            <Spacer height={1} />
            <Fieldset>
                <Fieldset.Title>Posts</Fieldset.Title>
                {posts && <Fieldset.Subtitle>{posts.length} posts</Fieldset.Subtitle>}
                {!posts && <Fieldset.Subtitle>Loading...</Fieldset.Subtitle>}
                {postsError && <Fieldset.Subtitle>An error occured</Fieldset.Subtitle>}
                {posts && <table>
                    <thead>
                        <tr>
                            <th>Title</th>
                            <th>Visibility</th>
                            <th>Created</th>
                            <th>Author</th>
                            <th>Size</th>
                        </tr>
                    </thead>
                    <tbody>
                        {posts?.map((post) => (
                            <tr key={post.id}>
                                <td><PostModal id={post.id} /></td>
                                <td>{post.visibility}</td>
                                <td>{new Date(post.createdAt).toLocaleDateString()} {new Date(post.createdAt).toLocaleTimeString()}</td>
                                <td>{post.users?.length ? post.users[0].username : <i>Deleted</i>}</td>
                                <td>{postSizes[post.id] ? `${postSizes[post.id]} MB` : ''}</td>
                            </tr>
                        ))}
                    </tbody>
                </table>}
                {Object.keys(postSizes).length && <div style={{ float: 'right' }}>
                    <Text>Total size: {Object.values(postSizes).reduce((prev, curr) => prev + curr)} MB</Text>
                </div>}
            </Fieldset>

        </div >
    )
}

export default Admin