import { FC, VFC } from 'react';
import { Box, Button, styled, Typography, useTheme } from '@mui/material';
import { DynamicSidebarModal } from 'component/common/SidebarModal/SidebarModal';
import { PageContent } from 'component/common/PageContent/PageContent';
import { PageHeader } from 'component/common/PageHeader/PageHeader';
import { CheckCircle } from '@mui/icons-material';
import { ChangeRequest } from '../ChangeRequest/ChangeRequest';
import { usePendingChangeRequests } from 'hooks/api/getters/usePendingChangeRequests/usePendingChangeRequests';
import { useChangeRequestApi } from 'hooks/api/actions/useChangeRequestApi/useChangeRequestApi';
import useToast from 'hooks/useToast';
import { formatUnknownError } from 'utils/formatUnknownError';
import { EnvironmentChangeRequest } from './EnvironmentChangeRequest/EnvironmentChangeRequest';
import { ReviewChangesHeader } from './ReviewChangesHeader/ReviewChangesHeader';

interface IChangeRequestSidebarProps {
    open: boolean;
    project: string;
    onClose: () => void;
}

const StyledPageContent = styled(PageContent)(({ theme }) => ({
    height: '100vh',
    overflow: 'auto',
    minWidth: '50vw',
    padding: theme.spacing(6),
    [theme.breakpoints.down('md')]: {
        padding: theme.spacing(4, 2),
    },
    '& .header': {
        padding: theme.spacing(0, 0, 2, 0),
    },
    '& .body': {
        padding: theme.spacing(3, 0, 0, 0),
    },
    borderRadius: `${theme.spacing(1.5, 0, 0, 1.5)} !important`,
}));

const BackButton = styled(Button)(({ theme }) => ({
    marginTop: theme.spacing(2),
    marginLeft: 'auto',
}));

export const StyledSuccessIcon = styled(CheckCircle)(({ theme }) => ({
    color: theme.palette.success.main,
    height: '32px',
    width: '32px',
    marginRight: theme.spacing(1),
}));

export const StyledFlexAlignCenterBox = styled(Box)(() => ({
    marginLeft: 'auto',
    display: 'flex',
    alignItems: 'center',
}));

export const Separator = () => (
    <Typography
        component="span"
        sx={{
            marginLeft: 1.5,
            marginRight: 1.5,
            color: 'dividerAlternative',
        }}
    >
        |
    </Typography>
);

export const UpdateCount: FC<{ count: number }> = ({ count }) => (
    <Box>
        <Typography component="span" variant="body1" color="text.secondary">
            Updates:{' '}
        </Typography>
        <Typography
            component="span"
            sx={{
                fontWeight: 'bold',
            }}
        >
            {count} {count === 1 ? 'feature toggle' : 'feature toggles'}
        </Typography>
    </Box>
);

export const ChangeRequestSidebar: VFC<IChangeRequestSidebarProps> = ({
    open,
    project,
    onClose,
}) => {
    const {
        data,
        loading,
        refetch: refetchChangeRequest,
    } = usePendingChangeRequests(project);
    const { changeState, discardDraft } = useChangeRequestApi();
    const { setToastApiError } = useToast();

    const onReview = async (draftId: number) => {
        try {
            await changeState(project, draftId, { state: 'In review' });
            refetchChangeRequest();
        } catch (error: unknown) {
            setToastApiError(formatUnknownError(error));
        }
    };

    const onDiscard = async (draftId: number) => {
        try {
            await discardDraft(project, draftId);
            refetchChangeRequest();
        } catch (error: unknown) {
            setToastApiError(formatUnknownError(error));
        }
    };

    if (!loading && !data) {
        return (
            <DynamicSidebarModal
                open={open}
                onClose={onClose}
                label="Review changes"
            >
                <StyledPageContent
                    disableBorder={true}
                    header={
                        <PageHeader titleElement="Review your changes"></PageHeader>
                    }
                >
                    There are no changes to review.
                    {/* FIXME: empty state */}
                    <BackButton onClick={onClose}>Close</BackButton>
                </StyledPageContent>
            </DynamicSidebarModal>
        );
    }

    return (
        <DynamicSidebarModal
            open={open}
            onClose={onClose}
            label="Review changes"
        >
            <StyledPageContent
                disableBorder={true}
                header={<ReviewChangesHeader />}
            >
                {data?.map(environmentChangeRequest => (
                    <EnvironmentChangeRequest
                        key={environmentChangeRequest.id}
                        environmentChangeRequest={environmentChangeRequest}
                        onClose={onClose}
                        onReview={onReview}
                        onDiscard={onDiscard}
                    >
                        <ChangeRequest
                            changeRequest={environmentChangeRequest}
                            onNavigate={onClose}
                            onRefetch={refetchChangeRequest}
                        />
                    </EnvironmentChangeRequest>
                ))}
            </StyledPageContent>
        </DynamicSidebarModal>
    );
};