import { type ChangeEvent, type FormEvent, useEffect, useState } from "react";
import toast from "react-hot-toast";
import api, { logout as requestLogout } from "../Api";
import { HeaderActions } from "./header/HeaderActions";
import { HeaderBrand } from "./header/HeaderBrand";
import { ProfileModal } from "./header/ProfileModal";
import { ServerModal } from "./header/ServerModal";
import { BulkImportModal } from "./header/BulkImportModal";
import type { Applications, DatabaseType, ServersType } from "../types/enums";
import type { User } from "../types/User";
import type { ProfileFormState, ServerFormState } from "./header/types";
import type { BulkImportResult } from "../types/BulkImport";
import { useNavigate } from "react-router-dom";

type ModalType = "addServer" | "editProfile" | "bulkImport" | null;

interface HeaderProps {
    currentUser: User | null;
    userError: string | null;
    onServerCreated?: () => Promise<void> | void;
    onProfileUpdated?: (user: User) => void;
}

const defaultServerForm: ServerFormState = {
    name: "",
    ip: "",
    port: "",
    user: "",
    password: "",
    type: "PRODUCTION",
    application: "ASTERISK",
    dbType: "MYSQL",
};

const defaultProfileForm: ProfileFormState = {
    firstName: "",
    lastName: "",
    email: "",
    password: "",
};

const serverTypeOptions: ServersType[] = ["PRODUCTION", "HOMOLOGATION", "DATABASE"];
const applicationOptions: Applications[] = ["ASTERISK", "HITMANAGER", "HITMANAGER_V2", "OMNIHIT", "HITPHONE"];
const databaseOptions: DatabaseType[] = ["MYSQL", "POSTGRESQL", "SQLSERVER", "ORACLE", "REDIS", "MONGODB", "MARIADB", "NONE"];

export const Header = ({ currentUser, userError, onServerCreated, onProfileUpdated }: HeaderProps) => {
    const navigate = useNavigate();
    const [isMenuOpen, setMenuOpen] = useState(false);
    const [activeModal, setActiveModal] = useState<ModalType>(null);
    const [serverForm, setServerForm] = useState<ServerFormState>(defaultServerForm);
    const [profileForm, setProfileForm] = useState<ProfileFormState>(defaultProfileForm);
    const [serverLoading, setServerLoading] = useState(false);
    const [profileLoading, setProfileLoading] = useState(false);
    const [bulkFile, setBulkFile] = useState<File | null>(null);
    const [bulkLoading, setBulkLoading] = useState(false);
    const [bulkResult, setBulkResult] = useState<BulkImportResult | null>(null);
    const [bulkError, setBulkError] = useState<string | null>(null);

    useEffect(() => {
        if (currentUser) {
            setProfileForm((prev) => ({
                ...prev,
                firstName: currentUser.firstName ?? "",
                lastName: currentUser.lastName ?? "",
                email: currentUser.email ?? "",
            }));
        }
    }, [currentUser]);

    const toggleMenu = () => setMenuOpen((prev) => !prev);
    const openModal = (modal: ModalType) => {
        setMenuOpen(false);
        setActiveModal(modal);
    };
    const closeModal = () => {
        setActiveModal(null);
        setServerForm(defaultServerForm);
        setProfileForm((prev) => ({ ...prev, password: "" }));
        setBulkFile(null);
        setBulkResult(null);
        setBulkError(null);
    };

    const handleServerFormChange = (event: ChangeEvent<HTMLInputElement | HTMLSelectElement>) => {
        const { name, value } = event.target;
        setServerForm((prev) => ({ ...prev, [name]: value }));
    };

    const handleProfileFormChange = (event: ChangeEvent<HTMLInputElement>) => {
        const { name, value } = event.target;
        setProfileForm((prev) => ({ ...prev, [name]: value }));
    };

    const handleServerSubmit = async (event: FormEvent) => {
        event.preventDefault();
        setServerLoading(true);
        try {
            await api.post("/api/servers", {
                ...serverForm,
                port: Number(serverForm.port),
            });
            toast.success("Servidor criado com sucesso!");
            setServerForm(defaultServerForm);
            setActiveModal(null);
            if (onServerCreated) {
                await Promise.resolve(onServerCreated());
            }
        } catch (err: any) {
            const message = err?.response?.data?.message || "Falha ao criar servidor.";
            toast.error(message);
        } finally {
            setServerLoading(false);
        }
    };

    const handleProfileSubmit = async (event: FormEvent) => {
        event.preventDefault();
        if (!currentUser) {
            toast.error("Usuário não identificado.");
            return;
        }
        setProfileLoading(true);
        try {
            const { data } = await api.put<User>(`/api/users/${currentUser.id}`, {
                firstName: profileForm.firstName,
                lastName: profileForm.lastName,
                email: profileForm.email,
                password: profileForm.password,
            });
            toast.success("Perfil atualizado com sucesso!");
            setProfileForm((prev) => ({ ...prev, password: "" }));
            setActiveModal(null);
            onProfileUpdated?.(data);
        } catch (err: any) {
            const message = err?.response?.data?.message || "Falha ao atualizar o perfil.";
            toast.error(message);
        } finally {
            setProfileLoading(false);
        }
    };

    const handleBulkSubmit = async () => {
        if (!bulkFile) {
            toast.error("Selecione um arquivo CSV para importar.");
            return;
        }
        setBulkLoading(true);
        setBulkError(null);
        try {
            const formData = new FormData();
            formData.append("file", bulkFile);
            const { data } = await api.post<BulkImportResult>("/api/servers/bulk", formData, {
                headers: { "Content-Type": "multipart/form-data" },
            });
            setBulkResult(data);
            toast.success(`Importação concluída: ${data.succeeded} sucesso(s).`);
            await Promise.resolve(onServerCreated?.());
        } catch (err: any) {
            const message = err?.response?.data?.message || "Falha ao importar servidores.";
            setBulkError(message);
            toast.error(message);
        } finally {
            setBulkLoading(false);
        }
    };

    const handleDownloadTemplate = () => {
        const sample = [
            "name;ip;port;user;password;type;application;dbType",
            "app-server;192.168.0.10;22;deploy;changeMe;PRODUCTION;HITMANAGER;POSTGRESQL",
        ].join("\n");
        const blob = new Blob([sample], { type: "text/csv;charset=utf-8;" });
        const url = URL.createObjectURL(blob);
        const link = document.createElement("a");
        link.href = url;
        link.download = "servers_template.csv";
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
        URL.revokeObjectURL(url);
    };

    const handleLogout = async () => {
        setMenuOpen(false);
        setActiveModal(null);
        try {
            await requestLogout();
            toast.success("Sessão encerrada com sucesso.");
        } catch (err: any) {
            const message = err?.response?.data?.message || "Não foi possível encerrar a sessão.";
            toast.error(message);
        } finally {
            navigate("/login", { replace: true });
        }
    };

    return (
        <>
            <header className={Styles.wrapper}>
                <HeaderBrand />
                <HeaderActions
                    isMenuOpen={isMenuOpen}
                    onToggleMenu={toggleMenu}
                    onAddServer={() => openModal("addServer")}
                    onEditProfile={() => openModal("editProfile")}
                    onBulkCreate={() => openModal("bulkImport")}
                    onLogout={handleLogout}
                />
            </header>

            <ServerModal
                isOpen={activeModal === "addServer"}
                form={serverForm}
                loading={serverLoading}
                onClose={closeModal}
                onChange={handleServerFormChange}
                onSubmit={handleServerSubmit}
                serverTypeOptions={serverTypeOptions}
                applicationOptions={applicationOptions}
                databaseOptions={databaseOptions}
            />

            <ProfileModal
                isOpen={activeModal === "editProfile"}
                currentUser={currentUser}
                userError={userError}
                form={profileForm}
                loading={profileLoading}
                onClose={closeModal}
                onChange={handleProfileFormChange}
                onSubmit={handleProfileSubmit}
            />

            <BulkImportModal
                isOpen={activeModal === "bulkImport"}
                file={bulkFile}
                loading={bulkLoading}
                result={bulkResult}
                error={bulkError}
                onClose={closeModal}
                onFileChange={setBulkFile}
                onSubmit={handleBulkSubmit}
                onDownloadTemplate={handleDownloadTemplate}
            />
        </>
    );
};

const Styles = {
    wrapper: "flex items-center justify-between rounded-xl border border-cardBorder bg-card px-6 py-4 shadow-sm",
};