"use client";

import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import {
    InfoSection,
    InfoSectionContent,
    InfoSections,
    InfoSectionTitle
} from "@app/components/InfoSection";
import { useTranslations } from "next-intl";
import { useEnvContext } from "@app/hooks/useEnvContext";
import { useDomainContext } from "@app/hooks/useDomainContext";
import {
    SettingsContainer,
    SettingsSection,
    SettingsSectionBody,
    SettingsSectionDescription,
    SettingsSectionFooter,
    SettingsSectionForm,
    SettingsSectionHeader,
    SettingsSectionTitle
} from "./Settings";
import { Button } from "./ui/button";
import {
    Form,
    FormControl,
    FormField,
    FormItem,
    FormLabel,
    FormMessage,
    FormDescription
} from "@app/components/ui/form";
import {
    Select,
    SelectContent,
    SelectItem,
    SelectTrigger,
    SelectValue
} from "./ui/select";
import { Input } from "./ui/input";
import { useForm } from "react-hook-form";
import z from "zod";
import { toASCII } from "punycode";
import { zodResolver } from "@hookform/resolvers/zod";
import { build } from "@server/build";
import { Switch } from "./ui/switch";
import { useEffect, useState } from "react";
import DNSRecordsTable, { DNSRecordRow } from "./DNSRecordTable";
import { createApiClient } from "@app/lib/api";
import { useToast } from "@app/hooks/useToast";
import { formatAxiosError } from "@app/lib/api";
import { Badge } from "./ui/badge";

type DomainInfoCardProps = {
    orgId?: string;
    domainId?: string;
};

// Helper functions for Unicode domain handling
function toPunycode(domain: string): string {
    try {
        const parts = toASCII(domain);
        return parts;
    } catch (error) {
        return domain.toLowerCase();
    }
}

function isValidDomainFormat(domain: string): boolean {
    const unicodeRegex = /^(?!:\/\/)([^\s.]+\.)*[^\s.]+$/;

    if (!unicodeRegex.test(domain)) {
        return false;
    }

    const parts = domain.split(".");
    for (const part of parts) {
        if (part.length === 0 || part.startsWith("-") || part.endsWith("-")) {
            return false;
        }
        if (part.length > 63) {
            return false;
        }
    }

    if (domain.length > 253) {
        return false;
    }

    return true;
}

const formSchema = z.object({
    baseDomain: z
        .string()
        .min(1, "Domain is required")
        .refine((val) => isValidDomainFormat(val), "Invalid domain format")
        .transform((val) => toPunycode(val)),
    type: z.enum(["ns", "cname", "wildcard"]),
    certResolver: z.string().nullable().optional(),
    preferWildcardCert: z.boolean().optional()
});

type FormValues = z.infer<typeof formSchema>;

const certResolverOptions = [
    { id: "default", title: "Default" },
    { id: "custom", title: "Custom Resolver" }
];

export default function DomainInfoCard({
    orgId,
    domainId
}: DomainInfoCardProps) {
    const { domain, updateDomain } = useDomainContext();
    const t = useTranslations();
    const { env } = useEnvContext();
    const api = createApiClient(useEnvContext());
    const { toast } = useToast();

    const [dnsRecords, setDnsRecords] = useState<DNSRecordRow[]>([]);
    const [loadingRecords, setLoadingRecords] = useState(true);
    const [isRefreshing, setIsRefreshing] = useState(false);
    const [saveLoading, setSaveLoading] = useState(false);

    const form = useForm<FormValues>({
        resolver: zodResolver(formSchema),
        defaultValues: {
            baseDomain: "",
            type:
                build == "oss" || !env.flags.usePangolinDns ? "wildcard" : "ns",
            certResolver: domain.certResolver,
            preferWildcardCert: false
        }
    });

    useEffect(() => {
        if (domain.domainId) {
            const certResolverValue =
                domain.certResolver && domain.certResolver.trim() !== ""
                    ? domain.certResolver
                    : null;

            form.reset({
                baseDomain: domain.baseDomain || "",
                type:
                    (domain.type as "ns" | "cname" | "wildcard") || "wildcard",
                certResolver: certResolverValue,
                preferWildcardCert: domain.preferWildcardCert || false
            });
        }
    }, [domain]);

    const fetchDNSRecords = async (showRefreshing = false) => {
        if (showRefreshing) {
            setIsRefreshing(true);
        } else {
            setLoadingRecords(true);
        }

        try {
            const response = await api.get<{ data: DNSRecordRow[] }>(
                `/org/${orgId}/domain/${domainId}/dns-records`
            );
            setDnsRecords(response.data.data);
        } catch (error) {
            // Only show error if records exist (not a 404)
            const err = error as any;
            if (err?.response?.status !== 404) {
                toast({
                    title: t("error"),
                    description: formatAxiosError(error),
                    variant: "destructive"
                });
            }
        } finally {
            setLoadingRecords(false);
            setIsRefreshing(false);
        }
    };

    useEffect(() => {
        if (domain.domainId) {
            fetchDNSRecords();
        }
    }, [domain.domainId]);

    const onSubmit = async (values: FormValues) => {
        if (!orgId || !domainId) {
            toast({
                title: t("error"),
                description: t("orgOrDomainIdMissing", {
                    fallback: "Organization or Domain ID is missing"
                }),
                variant: "destructive"
            });
            return;
        }

        setSaveLoading(true);

        try {
            if (!values.certResolver) {
                values.certResolver = null;
            }

            await api.patch(
                `/org/${orgId}/domain/${domainId}`,
                {
                    certResolver: values.certResolver,
                    preferWildcardCert: values.preferWildcardCert
                }
            );

            updateDomain({
                ...domain,
                certResolver: values.certResolver || null,
                preferWildcardCert: values.preferWildcardCert || false
            });

            toast({
                title: t("success"),
                description: t("domainSettingsUpdated", {
                    fallback: "Domain settings updated successfully"
                }),
                variant: "default"
            });
        } catch (error) {
            toast({
                title: t("error"),
                description: formatAxiosError(error),
                variant: "destructive"
            });
        } finally {
            setSaveLoading(false);
        }
    };

    const getTypeDisplay = (type: string) => {
        switch (type) {
            case "ns":
                return t("selectDomainTypeNsName");
            case "cname":
                return t("selectDomainTypeCnameName");
            case "wildcard":
                return t("selectDomainTypeWildcardName");
            default:
                return type;
        }
    };

    return (
        <>
            <Alert>
                <AlertDescription>
                    <InfoSections cols={3}>
                        <InfoSection>
                            <InfoSectionTitle>{t("type")}</InfoSectionTitle>
                            <InfoSectionContent>
                                <span>
                                    {getTypeDisplay(
                                        domain.type ? domain.type : ""
                                    )}
                                </span>
                            </InfoSectionContent>
                        </InfoSection>
                        <InfoSection>
                            <InfoSectionTitle>{t("status")}</InfoSectionTitle>
                            <InfoSectionContent>
                                {domain.verified ? (
                                    domain.type === "wildcard" ? (
                                        <Badge variant="outlinePrimary">
                                            {t("manual", {
                                                fallback: "Manual"
                                            })}
                                        </Badge>
                                    ) : (
                                        <Badge variant="green">
                                            {t("verified")}
                                        </Badge>
                                    )
                                ) : (
                                    <Badge variant="yellow">
                                        {t("pending", { fallback: "Pending" })}
                                    </Badge>
                                )}
                            </InfoSectionContent>
                        </InfoSection>
                    </InfoSections>
                </AlertDescription>
            </Alert>

            <DNSRecordsTable
                domainId={domain.domainId}
                records={dnsRecords}
                isRefreshing={isRefreshing}
                type={domain.type}
            />

            {domain.type === "wildcard" && (
                <SettingsContainer>
                    <SettingsSection>
                        <SettingsSectionHeader>
                            <SettingsSectionTitle>
                                {t("domainSetting")}
                            </SettingsSectionTitle>
                        </SettingsSectionHeader>

                        <SettingsSectionBody>
                            <SettingsSectionForm>
                                <Form {...form}>
                                    <form
                                        onSubmit={form.handleSubmit(onSubmit)}
                                        className="space-y-4"
                                        id="domain-settings-form"
                                    >
                                        <>
                                            <FormField
                                                control={form.control}
                                                name="certResolver"
                                                render={({ field }) => (
                                                    <FormItem>
                                                        <FormLabel>
                                                            {t("certResolver")}
                                                        </FormLabel>
                                                        <FormControl>
                                                            <Select
                                                                value={
                                                                    field.value ===
                                                                    null
                                                                        ? "default"
                                                                        : field.value ===
                                                                                "" ||
                                                                            (field.value &&
                                                                                field.value !==
                                                                                    "default")
                                                                          ? "custom"
                                                                          : "default"
                                                                }
                                                                onValueChange={(
                                                                    val
                                                                ) => {
                                                                    if (
                                                                        val ===
                                                                        "default"
                                                                    ) {
                                                                        field.onChange(
                                                                            null
                                                                        );
                                                                    } else if (
                                                                        val ===
                                                                        "custom"
                                                                    ) {
                                                                        field.onChange(
                                                                            ""
                                                                        );
                                                                    } else {
                                                                        field.onChange(
                                                                            val
                                                                        );
                                                                    }
                                                                }}
                                                            >
                                                                <SelectTrigger>
                                                                    <SelectValue
                                                                        placeholder={t(
                                                                            "selectCertResolver"
                                                                        )}
                                                                    />
                                                                </SelectTrigger>
                                                                <SelectContent>
                                                                    {certResolverOptions.map(
                                                                        (
                                                                            opt
                                                                        ) => (
                                                                            <SelectItem
                                                                                key={
                                                                                    opt.id
                                                                                }
                                                                                value={
                                                                                    opt.id
                                                                                }
                                                                            >
                                                                                {
                                                                                    opt.title
                                                                                }
                                                                            </SelectItem>
                                                                        )
                                                                    )}
                                                                </SelectContent>
                                                            </Select>
                                                        </FormControl>
                                                        <FormMessage />
                                                    </FormItem>
                                                )}
                                            />
                                            {form.watch("certResolver") !==
                                                null &&
                                                form.watch("certResolver") !==
                                                    "default" && (
                                                    <FormField
                                                        control={form.control}
                                                        name="certResolver"
                                                        render={({ field }) => (
                                                            <FormItem>
                                                                <FormControl>
                                                                    <Input
                                                                        placeholder={t(
                                                                            "enterCustomResolver"
                                                                        )}
                                                                        value={
                                                                            field.value ||
                                                                            ""
                                                                        }
                                                                        onChange={(
                                                                            e
                                                                        ) =>
                                                                            field.onChange(
                                                                                e
                                                                                    .target
                                                                                    .value
                                                                            )
                                                                        }
                                                                    />
                                                                </FormControl>
                                                                <FormMessage />
                                                            </FormItem>
                                                        )}
                                                    />
                                                )}

                                            {form.watch("certResolver") !==
                                                null &&
                                                form.watch("certResolver") !==
                                                    "default" && (
                                                    <FormField
                                                        control={form.control}
                                                        name="preferWildcardCert"
                                                        render={({
                                                            field: switchField
                                                        }) => (
                                                            <FormItem className="items-center space-y-2 mt-4">
                                                                <FormControl>
                                                                    <div className="flex items-center space-x-2">
                                                                        <Switch
                                                                            checked={
                                                                                switchField.value
                                                                            }
                                                                            onCheckedChange={
                                                                                switchField.onChange
                                                                            }
                                                                        />
                                                                        <FormLabel>
                                                                            {t(
                                                                                "preferWildcardCert"
                                                                            )}
                                                                        </FormLabel>
                                                                    </div>
                                                                </FormControl>

                                                                <FormDescription>
                                                                    {t(
                                                                        "preferWildcardCertDescription"
                                                                    )}
                                                                </FormDescription>
                                                                <FormMessage />
                                                            </FormItem>
                                                        )}
                                                    />
                                                )}
                                        </>
                                    </form>
                                </Form>
                            </SettingsSectionForm>
                        </SettingsSectionBody>

                        <SettingsSectionFooter>
                            <Button
                                type="submit"
                                loading={saveLoading}
                                disabled={saveLoading}
                                form="domain-settings-form"
                            >
                                {t("saveSettings")}
                            </Button>
                        </SettingsSectionFooter>
                    </SettingsSection>
                </SettingsContainer>
            )}
        </>
    );
}