import { type ChangeEvent, type FormEvent, useEffect, useState } from "react";
import toast from "react-hot-toast";
import api from "../Api";
import type { Applications, DatabaseType, ServersType } from "../types/enums";
import type { User } from "../types/User";

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

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

type ServerFormState = {
    name: string;
    ip: string;
    port: string;
    user: string;
    password: string;
    type: ServersType;
    application: Applications;
    dbType: DatabaseType;
};

type ProfileFormState = {
    firstName: string;
    lastName: string;
    email: string;
    password: string;
};

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 [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);

    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: "" }));
    };

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

    const handleProfileFormChange = (e: ChangeEvent<HTMLInputElement>) => {
        const { name, value } = e.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 renderModalContent = () => {
        if (activeModal === "addServer") {
            return (
                <form onSubmit={handleServerSubmit} className={Styles.form}>
                    <div className={Styles.formGrid}>
                        <div className={Styles.field}>
                            <label htmlFor="name" className={Styles.label}>Nome</label>
                            <input id="name" name="name" className={Styles.input} value={serverForm.name} onChange={handleServerFormChange} required />
                        </div>
                        <div className={Styles.field}>
                            <label htmlFor="ip" className={Styles.label}>IP</label>
                            <input id="ip" name="ip" className={Styles.input} value={serverForm.ip} onChange={handleServerFormChange} placeholder="192.168.0.10" required />
                        </div>
                    </div>
                    <div className={Styles.formGrid}>
                        <div className={Styles.field}>
                            <label htmlFor="port" className={Styles.label}>Porta</label>
                            <input id="port" name="port" type="number" min="1" className={Styles.input} value={serverForm.port} onChange={handleServerFormChange} required />
                        </div>
                        <div className={Styles.field}>
                            <label htmlFor="user" className={Styles.label}>Usuário</label>
                            <input id="user" name="user" className={Styles.input} value={serverForm.user} onChange={handleServerFormChange} required />
                        </div>
                    </div>
                    <div className={Styles.field}>
                        <label htmlFor="password" className={Styles.label}>Senha</label>
                        <input id="password" name="password" type="password" className={Styles.input} value={serverForm.password} onChange={handleServerFormChange} required />
                    </div>
                    <div className={Styles.formGrid}>
                        <div className={Styles.field}>
                            <label htmlFor="type" className={Styles.label}>Tipo</label>
                            <select id="type" name="type" className={Styles.select} value={serverForm.type} onChange={handleServerFormChange}>
                                {serverTypeOptions.map((option) => (
                                    <option key={option} value={option}>{option.toLowerCase()}</option>
                                ))}
                            </select>
                        </div>
                        <div className={Styles.field}>
                            <label htmlFor="application" className={Styles.label}>Aplicação</label>
                            <select id="application" name="application" className={Styles.select} value={serverForm.application} onChange={handleServerFormChange}>
                                {applicationOptions.map((option) => (
                                    <option key={option} value={option}>{option.toLowerCase()}</option>
                                ))}
                            </select>
                        </div>
                    </div>
                    <div className={Styles.field}>
                        <label htmlFor="dbType" className={Styles.label}>Banco de dados</label>
                        <select id="dbType" name="dbType" className={Styles.select} value={serverForm.dbType} onChange={handleServerFormChange}>
                            {databaseOptions.map((option) => (
                                <option key={option} value={option}>{option.toLowerCase()}</option>
                            ))}
                        </select>
                    </div>
                    <div className={Styles.modalActions}>
                        <button type="button" className={Styles.secondaryButton} onClick={closeModal}>Cancelar</button>
                        <button type="submit" className={Styles.primaryButton} disabled={serverLoading}>
                            {serverLoading ? "Salvando..." : "Salvar servidor"}
                        </button>
                    </div>
                </form>
            );
        }

        if (activeModal === "editProfile") {
            if (userError) {
                return <p className={Styles.helperText}>{userError}</p>;
            }

            return (
                <form onSubmit={handleProfileSubmit} className={Styles.form}>
                    <div className={Styles.formGrid}>
                        <div className={Styles.field}>
                            <label htmlFor="firstName" className={Styles.label}>Nome</label>
                            <input id="firstName" name="firstName" className={Styles.input} value={profileForm.firstName} onChange={handleProfileFormChange} required disabled={!currentUser} />
                        </div>
                        <div className={Styles.field}>
                            <label htmlFor="lastName" className={Styles.label}>Sobrenome</label>
                            <input id="lastName" name="lastName" className={Styles.input} value={profileForm.lastName} onChange={handleProfileFormChange} required disabled={!currentUser} />
                        </div>
                    </div>
                    <div className={Styles.field}>
                        <label htmlFor="email" className={Styles.label}>Email</label>
                        <input id="email" name="email" type="email" className={Styles.input} value={profileForm.email} onChange={handleProfileFormChange} required disabled={!currentUser} />
                    </div>
                    <div className={Styles.field}>
                        <label htmlFor="password" className={Styles.label}>Nova senha</label>
                        <input id="password" name="password" type="password" className={Styles.input} value={profileForm.password} onChange={handleProfileFormChange} placeholder="Informe uma nova senha" required disabled={!currentUser} />
                        <p className={Styles.helperText}>Informe uma nova senha para confirmar a alteração.</p>
                    </div>
                    <div className={Styles.modalActions}>
                        <button type="button" className={Styles.secondaryButton} onClick={closeModal}>Cancelar</button>
                        <button type="submit" className={Styles.primaryButton} disabled={profileLoading || !currentUser}>
                            {profileLoading ? "Salvando..." : "Salvar alterações"}
                        </button>
                    </div>
                </form>
            );
        }

        return null;
    };

    return (
        <>
            <header className={Styles.wrapper}>
                <div className={Styles.brand}>
                    <img src="/logo.webp" alt="Logo Hit Communications" className={Styles.logo} />
                    <div>
                        <p className={Styles.title}>Hit Communications</p>
                        <p className={Styles.subtitle}>Servers Manager</p>
                    </div>
                </div>

                <div className={Styles.actions}>
                    <div className="relative">
                        <button
                            type="button"
                            className={Styles.menuTrigger}
                            aria-haspopup="menu"
                            aria-expanded={isMenuOpen}
                            onClick={toggleMenu}
                        >
                            Opções
                        </button>
                        {isMenuOpen && (
                            <div className={Styles.dropdown} role="menu">
                                <button
                                    type="button"
                                    className={Styles.dropdownItem}
                                    onClick={() => openModal("addServer")}
                                >
                                    Adicionar servidor
                                </button>
                                <button
                                    type="button"
                                    className={Styles.dropdownItem}
                                    onClick={() => openModal("editProfile")}
                                >
                                    Editar perfil
                                </button>
                            </div>
                        )}
                    </div>
                    <button type="button" className={Styles.logoutButton}>
                        Sair
                    </button>
                </div>
            </header>

            {activeModal && (
                <div className={Styles.modalOverlay} role="dialog" aria-modal="true">
                    <div className={Styles.modal}>
                        <div className={Styles.modalHeader}>
                            <h2 className={Styles.modalTitle}>
                                {activeModal === "addServer" ? "Adicionar novo servidor" : "Editar perfil"}
                            </h2>
                            <button type="button" onClick={closeModal} className={Styles.closeButton} aria-label="Fechar modal">
                                ×
                            </button>
                        </div>
                        <div className={Styles.modalBody}>{renderModalContent()}</div>
                    </div>
                </div>
            )}
        </>
    );
};

const Styles = {
    wrapper: "flex items-center justify-between rounded-xl border border-cardBorder bg-card px-6 py-4 shadow-sm",
    brand: "flex items-center gap-3",
    logo: "h-10 w-10 object-contain",
    title: "text-base font-semibold text-text",
    subtitle: "text-xs uppercase tracking-wide text-text-secondary",
    actions: "flex items-center gap-3",
    menuTrigger: "rounded-lg border border-cardBorder bg-white/70 px-4 py-2 text-sm font-medium text-text flex items-center gap-2 hover:bg-white transition-colors",
    dropdown: "absolute right-0 mt-2 w-48 rounded-lg border border-cardBorder bg-white py-2 shadow-lg z-10",
    dropdownItem: "w-full px-4 py-2 text-left text-sm text-text-secondary hover:bg-bg hover:text-text transition-colors",
    logoutButton: "rounded-md bg-accent px-4 py-2 text-sm font-semibold text-white transition-colors hover:bg-hover",
    modalOverlay: "fixed inset-0 z-40 flex items-center justify-center bg-black/40 px-4",
    modal: "w-full max-w-2xl rounded-2xl border border-cardBorder bg-card p-6 shadow-xl",
    modalHeader: "flex items-start justify-between gap-4 pb-4 border-b border-cardBorder",
    modalTitle: "text-lg font-semibold text-text",
    closeButton: "text-2xl leading-none text-text-secondary hover:text-text",
    modalBody: "pt-4",
    form: "space-y-4",
    formGrid: "grid gap-4 md:grid-cols-2",
    field: "flex flex-col gap-2",
    label: "text-xs font-semibold uppercase tracking-wide text-text-secondary",
    input: "rounded-lg border border-cardBorder bg-white px-3 py-2 text-sm text-text outline-none focus:border-accent focus:ring-1 focus:ring-accent",
    select: "rounded-lg border border-cardBorder bg-white px-3 py-2 text-sm text-text outline-none focus:border-accent focus:ring-1 focus:ring-accent capitalize",
    helperText: "text-xs text-text-secondary",
    modalActions: "flex justify-end gap-3 pt-2",
    secondaryButton: "rounded-md border border-cardBorder px-4 py-2 text-sm font-medium text-text hover:bg-bg disabled:opacity-50",
    primaryButton: "rounded-md bg-accent px-4 py-2 text-sm font-semibold text-white hover:bg-hover disabled:opacity-70",
};