import { closeAllModals, openModal } from '@mantine/modals';
import { useQuery } from '@tanstack/react-query';
import DOMPurify from 'dompurify';
import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
import { useTranslation } from 'react-i18next';

import packageJson from '../../package.json';

import { formatHrDateTime } from '/@/renderer/utils/format';
import { Button } from '/@/shared/components/button/button';
import { Center } from '/@/shared/components/center/center';
import { Group } from '/@/shared/components/group/group';
import { Icon } from '/@/shared/components/icon/icon';
import { ScrollArea } from '/@/shared/components/scroll-area/scroll-area';
import { Select } from '/@/shared/components/select/select';
import { Spinner } from '/@/shared/components/spinner/spinner';
import { Stack } from '/@/shared/components/stack/stack';
import { Text } from '/@/shared/components/text/text';
import { useLocalStorage } from '/@/shared/hooks/use-local-storage';

const GITHUB_RELEASES_URL = 'https://api.github.com/repos/bouliehaan/samo/releases';
const GITHUB_COMPARE_URL = 'https://api.github.com/repos/bouliehaan/samo/compare';
const RELEASES_TO_FETCH = 30;

interface GitHubCompareCommit {
    commit: {
        author: { date: string; name: string };
        message: string;
    };
    html_url: string;
    sha: string;
}

interface GitHubCompareResponse {
    commits: GitHubCompareCommit[];
    total_commits: number;
}

interface GitHubRelease {
    body: null | string;
    name: null | string;
    prerelease: boolean;
    published_at: string;
    tag_name: string;
}

interface ReleaseNotesContentProps {
    onDismiss: () => void;
    version: string;
}

function isAlphaVersion(version: string): boolean {
    return version.includes('-alpha');
}

function parseVersionFromTag(tagName: string): string {
    return tagName.startsWith('v') ? tagName.slice(1) : tagName;
}

function toTag(version: string): string {
    return version.startsWith('v') ? version : `v${version}`;
}

const ReleaseNotesContent = ({ onDismiss, version }: ReleaseNotesContentProps) => {
    const { t } = useTranslation();
    const [selectedVersion, setSelectedVersion] = useState(version);
    const isAlpha = isAlphaVersion(selectedVersion);

    // Fetch list of recent releases for the selector
    const { data: releasesList = [] } = useQuery({
        queryFn: async () => {
            const response = await fetch(`${GITHUB_RELEASES_URL}?per_page=${RELEASES_TO_FETCH}`);
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            const data: GitHubRelease[] = await response.json();
            return data;
        },
        queryKey: ['github-releases-list'],
        retry: 2,
    });

    const latestStableRelease = useMemo(() => {
        return releasesList.find((r) => !r.prerelease);
    }, [releasesList]);

    const releaseOptions = useMemo(() => {
        const options = releasesList.slice(0, RELEASES_TO_FETCH).map((r) => {
            const v = parseVersionFromTag(r.tag_name);
            const dateStr = formatHrDateTime(r.published_at);
            return {
                label: dateStr ? `${v} - ${dateStr}` : v,
                value: v,
            };
        });
        const versions = options.map((o) => o.value);
        if (!versions.includes(version)) {
            options.unshift({ label: version, value: version });
        }
        return options;
    }, [releasesList, version]);

    // For alpha: fetch commits between latest stable and development branch
    const {
        data: compareData,
        isError: isCompareError,
        isLoading: isCompareLoading,
    } = useQuery({
        enabled: isAlpha && !!latestStableRelease,
        queryFn: async () => {
            const base = latestStableRelease!.tag_name;
            const head = 'development';
            const response = await fetch(`${GITHUB_COMPARE_URL}/${base}...${head}?per_page=100`);
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            const data: GitHubCompareResponse = await response.json();
            return data;
        },
        queryKey: ['github-compare', latestStableRelease?.tag_name, 'development'],
        retry: 2,
    });

    // For non-alpha: fetch release by tag
    const {
        data: releaseData,
        isError,
        isLoading,
    } = useQuery({
        enabled: !isAlpha,
        queryFn: async () => {
            const response = await fetch(`${GITHUB_RELEASES_URL}/tags/${toTag(selectedVersion)}`);
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            const data: GitHubRelease = await response.json();
            return data;
        },
        queryKey: ['github-release', selectedVersion],
        retry: 2,
    });

    // Convert markdown to HTML using GitHub's markdown API
    const { data: htmlContent, isLoading: isConverting } = useQuery({
        enabled: !isAlpha && !!releaseData?.body,
        queryFn: async () => {
            const response = await fetch('https://api.github.com/markdown', {
                body: JSON.stringify({
                    mode: 'gfm',
                    text: releaseData?.body ?? '',
                }),
                headers: {
                    'Content-Type': 'application/json',
                },
                method: 'POST',
            });
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            return response.text();
        },
        queryKey: ['github-markdown', releaseData?.body],
        retry: 2,
    });

    const sanitizedHtml = useMemo(() => {
        if (!htmlContent) return '';
        return DOMPurify.sanitize(htmlContent, {
            ALLOWED_ATTR: ['alt', 'href', 'src', 'title'],
            ALLOWED_TAGS: [
                'a',
                'blockquote',
                'br',
                'code',
                'em',
                'h1',
                'h2',
                'h3',
                'h4',
                'h5',
                'h6',
                'img',
                'li',
                'ol',
                'p',
                'pre',
                'strong',
                'u',
                'ul',
            ],
        });
    }, [htmlContent]);

    const isLoadingState = isAlpha ? isCompareLoading : isLoading || isConverting;
    const isErrorState = isAlpha ? isCompareError : isError || !releaseData;

    if (isLoadingState) {
        return (
            <Center h={400}>
                <Spinner />
            </Center>
        );
    }

    if (isErrorState) {
        const showCompareError = isAlpha && latestStableRelease;
        return (
            <Stack gap="md">
                {releaseOptions.length > 1 && (
                    <Select
                        data={releaseOptions}
                        onChange={(v) => v && setSelectedVersion(v)}
                        value={selectedVersion}
                    />
                )}
                <Text size="sm">{t('error.genericError', { postProcess: 'sentenceCase' })}</Text>
                <Group justify="flex-end">
                    <Button
                        component="a"
                        href={
                            showCompareError
                                ? `https://github.com/bouliehaan/samo/compare/${latestStableRelease.tag_name}...${toTag(selectedVersion)}`
                                : `https://github.com/bouliehaan/samo/releases/tag/${toTag(selectedVersion)}`
                        }
                        onClick={onDismiss}
                        rightSection={<Icon icon="externalLink" />}
                        target="_blank"
                        variant="filled"
                    >
                        {t('common.viewReleaseNotes', { postProcess: 'sentenceCase' })}
                    </Button>
                    <Button onClick={onDismiss} variant="default">
                        {t('common.dismiss', { postProcess: 'titleCase' })}
                    </Button>
                </Group>
            </Stack>
        );
    }

    if (isAlpha && !latestStableRelease) {
        return (
            <Stack gap="md">
                {releaseOptions.length > 1 && (
                    <Select
                        data={releaseOptions}
                        onChange={(v) => v && setSelectedVersion(v)}
                        value={selectedVersion}
                    />
                )}
                <Text isMuted size="sm">
                    {t('page.releasenotes.noStableReleaseToCompare', {
                        postProcess: 'sentenceCase',
                    })}
                </Text>
                <Group justify="flex-end">
                    <Button
                        component="a"
                        href={`https://github.com/bouliehaan/samo/releases/tag/${toTag(selectedVersion)}`}
                        onClick={onDismiss}
                        rightSection={<Icon icon="externalLink" />}
                        target="_blank"
                        variant="subtle"
                    >
                        {t('action.viewMore', { postProcess: 'sentenceCase' })}
                    </Button>
                    <Button onClick={onDismiss} variant="filled">
                        {t('common.dismiss', { postProcess: 'titleCase' })}
                    </Button>
                </Group>
            </Stack>
        );
    }

    if (isAlpha && compareData) {
        const commits = compareData.commits ?? [];
        const compareUrl = `https://github.com/bouliehaan/samo/compare/${latestStableRelease?.tag_name}...development`;
        return (
            <Stack gap="md">
                {releaseOptions.length > 1 && (
                    <Select
                        data={releaseOptions}
                        onChange={(v) => v && setSelectedVersion(v)}
                        value={selectedVersion}
                    />
                )}
                <Text isMuted size="sm">
                    {t('page.releasenotes.commitsSinceStable', {
                        postProcess: 'sentenceCase',
                        stable: latestStableRelease
                            ? parseVersionFromTag(latestStableRelease.tag_name)
                            : '',
                    })}
                </Text>
                <ScrollArea
                    style={{
                        height: '400px',
                    }}
                >
                    <Stack gap="xs">
                        {commits.length === 0 ? (
                            <Text isMuted size="sm">
                                {t('page.releasenotes.noNewCommits', {
                                    postProcess: 'sentenceCase',
                                })}
                            </Text>
                        ) : (
                            commits.map((c) => {
                                const firstLine = c.commit.message.split('\n')[0];
                                return (
                                    <Group
                                        gap="sm"
                                        key={c.sha}
                                        style={{ alignItems: 'flex-start' }}
                                        wrap="nowrap"
                                    >
                                        <Text
                                            size="sm"
                                            style={{ flex: 1 }}
                                            title={c.commit.message}
                                            truncate
                                        >
                                            {firstLine}
                                        </Text>
                                        <Text isMuted size="xs">
                                            {formatHrDateTime(c.commit.author.date)}
                                        </Text>
                                        <Button
                                            component="a"
                                            href={c.html_url}
                                            rightSection={<Icon icon="externalLink" />}
                                            size="compact-xs"
                                            target="_blank"
                                            variant="subtle"
                                        >
                                            {t('common.view', { postProcess: 'sentenceCase' })}
                                        </Button>
                                    </Group>
                                );
                            })
                        )}
                    </Stack>
                </ScrollArea>
                <Group justify="flex-end">
                    <Button
                        component="a"
                        href={compareUrl}
                        onClick={onDismiss}
                        rightSection={<Icon icon="externalLink" />}
                        target="_blank"
                        variant="subtle"
                    >
                        {t('action.viewMore', { postProcess: 'sentenceCase' })}
                    </Button>
                    <Button onClick={onDismiss} variant="filled">
                        {t('common.dismiss', { postProcess: 'titleCase' })}
                    </Button>
                </Group>
            </Stack>
        );
    }

    return (
        <Stack gap="md">
            {releaseOptions.length > 1 && (
                <Select
                    data={releaseOptions}
                    onChange={(v) => v && setSelectedVersion(v)}
                    value={selectedVersion}
                />
            )}
            <ScrollArea
                style={{
                    height: '400px',
                }}
            >
                <Text
                    dangerouslySetInnerHTML={{ __html: sanitizedHtml }}
                    fw={400}
                    lh="1.5"
                    size="md"
                />
            </ScrollArea>
            <Group justify="flex-end">
                <Button
                    component="a"
                    href={`https://github.com/bouliehaan/samo/releases/tag/${toTag(selectedVersion)}`}
                    onClick={onDismiss}
                    rightSection={<Icon icon="externalLink" />}
                    target="_blank"
                    variant="subtle"
                >
                    {t('action.viewMore', { postProcess: 'sentenceCase' })}
                </Button>
                <Button onClick={onDismiss} variant="filled">
                    {t('common.dismiss', { postProcess: 'titleCase' })}
                </Button>
            </Group>
        </Stack>
    );
};

const WAIT_FOR_LOCAL_STORAGE = 1000 * 2;

interface ReleaseNotesModalContentWrapperProps {
    setDismissRef?: (fn: (() => void) | undefined) => void;
}

const ReleaseNotesModalContentWrapper = ({
    setDismissRef,
}: ReleaseNotesModalContentWrapperProps) => {
    const { version } = packageJson;
    const [, setValue] = useLocalStorage({ key: 'version' });

    const handleDismiss = useCallback(() => {
        setValue(version);
        closeAllModals();
    }, [setValue, version]);

    useEffect(() => {
        setDismissRef?.(handleDismiss);
        return () => setDismissRef?.(undefined);
    }, [handleDismiss, setDismissRef]);

    return <ReleaseNotesContent onDismiss={handleDismiss} version={version} />;
};

export const openReleaseNotesModal = (title: string) => {
    const dismissRef = { current: null as (() => void) | null };

    openModal({
        children: (
            <ReleaseNotesModalContentWrapper
                setDismissRef={(fn) => {
                    dismissRef.current = fn ?? null;
                }}
            />
        ),
        onClose: () => dismissRef.current?.(),
        size: 'xl',
        title,
    });
};

export const ReleaseNotesModal = () => {
    const { version } = packageJson;
    const { t } = useTranslation();
    const dismissRef = useRef<(() => void) | null>(null);

    useEffect(() => {
        const timeoutId = setTimeout(() => {
            const valueFromLocalStorage = localStorage.getItem('version');
            const versionString = `"${version}"`;

            // Only show modal if the stored version is different from current version
            if (valueFromLocalStorage !== versionString) {
                openModal({
                    children: (
                        <ReleaseNotesModalContentWrapper
                            setDismissRef={(fn) => {
                                dismissRef.current = fn ?? null;
                            }}
                        />
                    ),
                    onClose: () => dismissRef.current?.(),
                    size: 'xl',
                    title: t('common.newVersion', {
                        postProcess: 'sentenceCase',
                        version,
                    }) as string,
                });
            }
        }, WAIT_FOR_LOCAL_STORAGE);

        return () => {
            clearTimeout(timeoutId);
        };
    }, [t, version]);

    return null;
};