package stirling.software.SPDF.model.provider;

import static stirling.software.SPDF.model.UsernameAttribute.EMAIL;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Collectors;

import lombok.Data;
import lombok.NoArgsConstructor;
import stirling.software.SPDF.model.UsernameAttribute;
import stirling.software.SPDF.model.exception.UnsupportedUsernameAttribute;

@Data
@NoArgsConstructor
public class Provider {

    private String issuer;
    private String name;
    private String clientName;
    private String clientId;
    private String clientSecret;
    private Collection<String> scopes;
    private UsernameAttribute useAsUsername;
    private String authorizationUri;
    private String tokenUri;
    private String userInfoUri;

    public Provider(
            String issuer,
            String name,
            String clientName,
            String clientId,
            String clientSecret,
            Collection<String> scopes,
            UsernameAttribute useAsUsername,
            String authorizationUri,
            String tokenUri,
            String userInfoUri) {
        this.issuer = issuer;
        this.name = name;
        this.clientName = clientName;
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.scopes = scopes == null ? new ArrayList<>() : scopes;
        this.useAsUsername =
                useAsUsername != null ? validateUsernameAttribute(useAsUsername) : EMAIL;
        this.authorizationUri = authorizationUri;
        this.tokenUri = tokenUri;
        this.userInfoUri = userInfoUri;
    }

    public void setScopes(String scopes) {
        if (scopes != null && !scopes.isBlank()) {
            this.scopes =
                    Arrays.stream(scopes.split(",")).map(String::trim).collect(Collectors.toList());
        }
    }

    private UsernameAttribute validateUsernameAttribute(UsernameAttribute usernameAttribute) {
        switch (name) {
            case "google" -> {
                return validateGoogleUsernameAttribute(usernameAttribute);
            }
            case "github" -> {
                return validateGitHubUsernameAttribute(usernameAttribute);
            }
            case "keycloak" -> {
                return validateKeycloakUsernameAttribute(usernameAttribute);
            }
            default -> {
                return usernameAttribute;
            }
        }
    }

    private UsernameAttribute validateKeycloakUsernameAttribute(
            UsernameAttribute usernameAttribute) {
        switch (usernameAttribute) {
            case EMAIL, PREFERRED_NAME -> {
                return usernameAttribute;
            }
            default ->
                    throw new UnsupportedUsernameAttribute(
                            "The attribute "
                                    + usernameAttribute
                                    + "is not supported for "
                                    + clientName
                                    + ".");
        }
    }

    private UsernameAttribute validateGoogleUsernameAttribute(UsernameAttribute usernameAttribute) {
        switch (usernameAttribute) {
            case EMAIL, NAME, GIVEN_NAME, PREFERRED_NAME -> {
                return usernameAttribute;
            }
            default ->
                    throw new UnsupportedUsernameAttribute(
                            "The attribute "
                                    + usernameAttribute
                                    + "is not supported for "
                                    + clientName
                                    + ".");
        }
    }

    private UsernameAttribute validateGitHubUsernameAttribute(UsernameAttribute usernameAttribute) {
        switch (usernameAttribute) {
            case EMAIL, NAME, LOGIN -> {
                return usernameAttribute;
            }
            default ->
                    throw new UnsupportedUsernameAttribute(
                            "The attribute "
                                    + usernameAttribute
                                    + "is not supported for "
                                    + clientName
                                    + ".");
        }
    }

    @Override
    public String toString() {
        return "Provider [name="
                + getName()
                + ", clientName="
                + getClientName()
                + ", clientId="
                + getClientId()
                + ", clientSecret="
                + (getClientSecret() != null && !getClientSecret().isEmpty() ? "*****" : "NULL")
                + ", scopes="
                + getScopes()
                + ", useAsUsername="
                + getUseAsUsername()
                + "]";
    }
}