package com.gbcm.server.impl.entity;

import com.gbcm.server.api.enums.ServiceType;
import jakarta.persistence.*;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;

import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.List;

/**
 * Entité représentant un client de la plateforme GBCM.
 * Un client est associé à un utilisateur et peut avoir plusieurs services.
 * 
 * @author GBCM Development Team
 * @version 1.0
 * @since 1.0
 */
@Entity
@Table(name = "clients", indexes = {
        @Index(name = "idx_clients_user_id", columnList = "user_id", unique = true),
        @Index(name = "idx_clients_company", columnList = "company_name"),
        @Index(name = "idx_clients_status", columnList = "status"),
        @Index(name = "idx_clients_deleted", columnList = "deleted")
})
@NamedQueries({
        @NamedQuery(name = "Client.findByUserId", query = "SELECT c FROM Client c WHERE c.user.id = :userId AND c.deleted = false"),
        @NamedQuery(name = "Client.findByStatus", query = "SELECT c FROM Client c WHERE c.status = :status AND c.deleted = false"),
        @NamedQuery(name = "Client.findByCompanyName", query = "SELECT c FROM Client c WHERE LOWER(c.companyName) LIKE LOWER(:companyName) AND c.deleted = false"),
        @NamedQuery(name = "Client.findActiveClients", query = "SELECT c FROM Client c WHERE c.status = 'ACTIVE' AND c.deleted = false")
})
public class Client extends BaseEntity {

    /**
     * Identifiant unique du client.
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    /**
     * Utilisateur associé à ce client.
     * Relation one-to-one obligatoire.
     */
    @OneToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "user_id", nullable = false, unique = true, foreignKey = @ForeignKey(name = "fk_clients_user_id"))
    @NotNull(message = "L'utilisateur associé est obligatoire")
    private User user;

    /**
     * Nom de l'entreprise du client.
     */
    @Column(name = "company_name", nullable = false, length = 200)
    @NotBlank(message = "Le nom de l'entreprise est obligatoire")
    @Size(max = 200, message = "Le nom de l'entreprise ne peut pas dépasser 200 caractères")
    private String companyName;

    /**
     * Secteur d'activité de l'entreprise.
     */
    @Column(name = "industry", length = 100)
    @Size(max = 100, message = "Le secteur d'activité ne peut pas dépasser 100 caractères")
    private String industry;

    /**
     * Taille de l'entreprise (nombre d'employés).
     */
    @Column(name = "company_size")
    private Integer companySize;

    /**
     * Chiffre d'affaires annuel de l'entreprise.
     */
    @Column(name = "annual_revenue", precision = 15, scale = 2)
    private BigDecimal annualRevenue;

    /**
     * Devise du chiffre d'affaires.
     */
    @Column(name = "revenue_currency", length = 3)
    @Size(min = 3, max = 3, message = "Le code devise doit faire 3 caractères")
    private String revenueCurrency = "USD";

    /**
     * Locale préférée.
     */
    @Column(name = "preferred_locale", length = 20)
    @Size(max = 20, message = "La locale ne peut pas dépasser 20 caractères")
    private String preferredLocale = "fr-FR";

    /**
     * Adresse de l'entreprise - ligne 1.
     */
    @Column(name = "address_line1", length = 255)
    @Size(max = 255, message = "L'adresse ligne 1 ne peut pas dépasser 255 caractères")
    private String addressLine1;

    /**
     * Adresse de l'entreprise - ligne 2.
     */
    @Column(name = "address_line2", length = 255)
    @Size(max = 255, message = "L'adresse ligne 2 ne peut pas dépasser 255 caractères")
    private String addressLine2;

    /**
     * Ville de l'entreprise.
     */
    @Column(name = "city", length = 100)
    @Size(max = 100, message = "La ville ne peut pas dépasser 100 caractères")
    private String city;

    /**
     * État/Province de l'entreprise.
     */
    @Column(name = "state", length = 100)
    @Size(max = 100, message = "L'état ne peut pas dépasser 100 caractères")
    private String state;

    /**
     * Code postal de l'entreprise.
     */
    @Column(name = "postal_code", length = 20)
    @Size(max = 20, message = "Le code postal ne peut pas dépasser 20 caractères")
    private String postalCode;

    /**
     * Pays de l'entreprise.
     */
    @Column(name = "country", length = 100)
    @Size(max = 100, message = "Le pays ne peut pas dépasser 100 caractères")
    private String country;

    /**
     * Site web de l'entreprise.
     */
    @Column(name = "website", length = 255)
    @Size(max = 255, message = "Le site web ne peut pas dépasser 255 caractères")
    private String website;

    /**
     * Statut du client.
     */
    @Enumerated(EnumType.STRING)
    @Column(name = "status", nullable = false, length = 20)
    @NotNull(message = "Le statut est obligatoire")
    private ClientStatus status = ClientStatus.PROSPECT;

    /**
     * Date de conversion de prospect à client.
     */
    @Column(name = "converted_at")
    private LocalDateTime convertedAt;

    /**
     * Type de service principal du client.
     */
    @Enumerated(EnumType.STRING)
    @Column(name = "primary_service_type", length = 30)
    private ServiceType primaryServiceType;

    /**
     * Valeur totale des contrats du client.
     */
    @Column(name = "total_contract_value", precision = 15, scale = 2)
    private BigDecimal totalContractValue = BigDecimal.ZERO;

    /**
     * Date de début de la relation client.
     */
    @Column(name = "relationship_start_date")
    private LocalDate relationshipStartDate;

    /**
     * Notes internes sur le client.
     */
    @Column(name = "notes", columnDefinition = "TEXT")
    private String notes;

    /**
     * Source d'acquisition du client.
     */
    @Column(name = "acquisition_source", length = 100)
    @Size(max = 100, message = "La source d'acquisition ne peut pas dépasser 100 caractères")
    private String acquisitionSource;

    /**
     * Date de début de service.
     */
    @Column(name = "service_start_date")
    private LocalDate serviceStartDate;

    /**
     * Date de fin de service.
     */
    @Column(name = "service_end_date")
    private LocalDate serviceEndDate;

    /**
     * Constructeur par défaut.
     */
    public Client() {
        super();
    }

    /**
     * Constructeur avec les champs obligatoires.
     * 
     * @param user        l'utilisateur associé
     * @param companyName le nom de l'entreprise
     */
    public Client(User user, String companyName) {
        this();
        this.user = user;
        this.companyName = companyName;
    }

    /**
     * Convertit un prospect en client.
     */
    public void convertToClient() {
        if (this.status == ClientStatus.PROSPECT) {
            this.status = ClientStatus.ACTIVE;
            this.convertedAt = LocalDateTime.now();
            this.relationshipStartDate = LocalDate.now();
        }
    }

    /**
     * Désactive le client.
     */
    public void deactivate() {
        this.status = ClientStatus.INACTIVE;
    }

    /**
     * Réactive le client.
     */
    public void reactivate() {
        this.status = ClientStatus.ACTIVE;
    }

    /**
     * Ajoute une valeur au contrat total.
     * 
     * @param amount le montant à ajouter
     */
    public void addContractValue(BigDecimal amount) {
        if (amount != null && amount.compareTo(BigDecimal.ZERO) > 0) {
            this.totalContractValue = this.totalContractValue.add(amount);
        }
    }

    /**
     * Retourne l'adresse complète formatée.
     * 
     * @return l'adresse complète
     */
    public String getFullAddress() {
        StringBuilder address = new StringBuilder();

        if (addressLine1 != null && !addressLine1.trim().isEmpty()) {
            address.append(addressLine1);
        }

        if (addressLine2 != null && !addressLine2.trim().isEmpty()) {
            if (address.length() > 0)
                address.append(", ");
            address.append(addressLine2);
        }

        if (city != null && !city.trim().isEmpty()) {
            if (address.length() > 0)
                address.append(", ");
            address.append(city);
        }

        if (state != null && !state.trim().isEmpty()) {
            if (address.length() > 0)
                address.append(", ");
            address.append(state);
        }

        if (postalCode != null && !postalCode.trim().isEmpty()) {
            if (address.length() > 0)
                address.append(" ");
            address.append(postalCode);
        }

        if (country != null && !country.trim().isEmpty()) {
            if (address.length() > 0)
                address.append(", ");
            address.append(country);
        }

        return address.toString();
    }

    /**
     * Vérifie si le client est actif.
     * 
     * @return true si le client est actif, false sinon
     */
    public boolean isActiveClient() {
        return status == ClientStatus.ACTIVE;
    }

    /**
     * Vérifie si le client est un prospect.
     * 
     * @return true si c'est un prospect, false sinon
     */
    public boolean isProspect() {
        return status == ClientStatus.PROSPECT;
    }

    /**
     * Méthode de recherche par ID utilisateur.
     * 
     * @param userId l'ID de l'utilisateur
     * @return le client trouvé ou null
     */
    public static Client findByUserId(Long userId) {
        return find("#Client.findByUserId", userId).firstResult();
    }

    /**
     * Méthode de recherche par statut.
     * 
     * @param status le statut à rechercher
     * @return la liste des clients avec ce statut
     */
    public static List<Client> findByStatus(ClientStatus status) {
        return find("#Client.findByStatus", status).list();
    }

    /**
     * Méthode de recherche par nom d'entreprise.
     * 
     * @param companyName le nom d'entreprise à rechercher
     * @return la liste des clients correspondants
     */
    public static List<Client> findByCompanyName(String companyName) {
        String searchPattern = "%" + companyName + "%";
        return find("#Client.findByCompanyName", searchPattern).list();
    }

    /**
     * Méthode de recherche des clients actifs.
     * 
     * @return la liste des clients actifs
     */
    public static List<Client> findActiveClients() {
        return find("#Client.findActiveClients").list();
    }

    // Getters et Setters

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public String getIndustry() {
        return industry;
    }

    public void setIndustry(String industry) {
        this.industry = industry;
    }

    public Integer getCompanySize() {
        return companySize;
    }

    public void setCompanySize(Integer companySize) {
        this.companySize = companySize;
    }

    public BigDecimal getAnnualRevenue() {
        return annualRevenue;
    }

    public void setAnnualRevenue(BigDecimal annualRevenue) {
        this.annualRevenue = annualRevenue;
    }

    public String getRevenueCurrency() {
        return revenueCurrency;
    }

    public void setRevenueCurrency(String revenueCurrency) {
        this.revenueCurrency = revenueCurrency;
    }

    public String getPreferredLocale() {
        return preferredLocale;
    }

    public void setPreferredLocale(String preferredLocale) {
        this.preferredLocale = preferredLocale;
    }

    public String getAddressLine1() {
        return addressLine1;
    }

    public void setAddressLine1(String addressLine1) {
        this.addressLine1 = addressLine1;
    }

    public String getAddressLine2() {
        return addressLine2;
    }

    public void setAddressLine2(String addressLine2) {
        this.addressLine2 = addressLine2;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getPostalCode() {
        return postalCode;
    }

    public void setPostalCode(String postalCode) {
        this.postalCode = postalCode;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getWebsite() {
        return website;
    }

    public void setWebsite(String website) {
        this.website = website;
    }

    public ClientStatus getStatus() {
        return status;
    }

    public void setStatus(ClientStatus status) {
        this.status = status;
    }

    public LocalDateTime getConvertedAt() {
        return convertedAt;
    }

    public void setConvertedAt(LocalDateTime convertedAt) {
        this.convertedAt = convertedAt;
    }

    public ServiceType getPrimaryServiceType() {
        return primaryServiceType;
    }

    public void setPrimaryServiceType(ServiceType primaryServiceType) {
        this.primaryServiceType = primaryServiceType;
    }

    public BigDecimal getTotalContractValue() {
        return totalContractValue;
    }

    public void setTotalContractValue(BigDecimal totalContractValue) {
        this.totalContractValue = totalContractValue;
    }

    public LocalDate getRelationshipStartDate() {
        return relationshipStartDate;
    }

    public void setRelationshipStartDate(LocalDate relationshipStartDate) {
        this.relationshipStartDate = relationshipStartDate;
    }

    public String getNotes() {
        return notes;
    }

    public void setNotes(String notes) {
        this.notes = notes;
    }

    public String getAcquisitionSource() {
        return acquisitionSource;
    }

    public void setAcquisitionSource(String acquisitionSource) {
        this.acquisitionSource = acquisitionSource;
    }

    public LocalDate getServiceStartDate() {
        return serviceStartDate;
    }

    public void setServiceStartDate(LocalDate serviceStartDate) {
        this.serviceStartDate = serviceStartDate;
    }

    public LocalDate getServiceEndDate() {
        return serviceEndDate;
    }

    public void setServiceEndDate(LocalDate serviceEndDate) {
        this.serviceEndDate = serviceEndDate;
    }

    @Override
    public String toString() {
        return "Client{" +
                "id=" + id +
                ", companyName='" + companyName + '\'' +
                ", industry='" + industry + '\'' +
                ", status=" + status +
                ", totalContractValue=" + totalContractValue +
                ", relationshipStartDate=" + relationshipStartDate +
                '}';
    }

    /**
     * Énumération des statuts de client.
     */
    public enum ClientStatus {
        /**
         * Prospect - pas encore client.
         */
        PROSPECT,

        /**
         * Client actif.
         */
        ACTIVE,

        /**
         * Client inactif.
         */
        INACTIVE,

        /**
         * Client suspendu.
         */
        SUSPENDED,

        /**
         * Ancien client.
         */
        FORMER
    }
}