package org.keycloak.config;

import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

public class Option<T> {

    private final Class<T> type;
    private final String key;
    private final OptionCategory category;
    private final boolean hidden;
    private final boolean buildTime;
    private final String description;
    private final Optional<T> defaultValue;
    private final List<String> expectedValues;
    private final boolean strictExpectedValues;
    private final DeprecatedMetadata deprecatedMetadata;

    public Option(Class<T> type, String key, OptionCategory category, boolean hidden, boolean buildTime, String description, Optional<T> defaultValue, List<String> expectedValues, boolean strictExpectedValues, DeprecatedMetadata deprecatedMetadata) {
        this.type = type;
        this.key = key;
        this.category = category;
        this.hidden = hidden;
        this.buildTime = buildTime;
        this.description = getDescriptionByCategorySupportLevel(description, category);
        this.defaultValue = defaultValue;
        this.expectedValues = expectedValues;
        this.strictExpectedValues = strictExpectedValues;
        this.deprecatedMetadata = deprecatedMetadata;
    }

    public Class<T> getType() {
        return type;
    }

    public boolean isHidden() { return hidden; }

    public boolean isBuildTime() {
        return buildTime;
    }

    public String getKey() {
        return key;
    }

    public OptionCategory getCategory() {
        return category;
    }

    public String getDescription() { return description; }

    public Optional<T> getDefaultValue() {
        return defaultValue;
    }

    /**
     * If {@link #isStrictExpectedValues()} is false, custom values can be provided
     * Otherwise, only specified expected values can be used
     *
     * @return expected values
     */
    public List<String> getExpectedValues() {
        return expectedValues;
    }

    /**
     * Denotes whether a custom value can be provided among the expected values
     * If strict, application fails when some custom value is provided
     */
    public boolean isStrictExpectedValues() {
        return strictExpectedValues;
    }

    public Optional<DeprecatedMetadata> getDeprecatedMetadata() {
        return Optional.ofNullable(deprecatedMetadata);
    }

    public Option<T> withRuntimeSpecificDefault(T defaultValue) {
        return new Option<T>(
            this.type,
            this.key,
            this.category,
            this.hidden,
            this.buildTime,
            this.description,
            Optional.ofNullable(defaultValue),
            this.expectedValues,
            this.strictExpectedValues,
            this.deprecatedMetadata
        );
    }

    private static String getDescriptionByCategorySupportLevel(String description, OptionCategory category) {
        if (description != null && !description.isBlank()) {
            switch (category.getSupportLevel()) {
            case PREVIEW:
                description = "Preview: " + description;
                break;
            case EXPERIMENTAL:
                description = "Experimental: " + description;
                break;
            default:
                break;
            }
        }

        return description;
    }

    public static String getDefaultValueString(Object value) {
        if (value == null) {
            return null;
        }
        if (value instanceof List) {
            return ((List<?>) value).stream().map(String::valueOf).collect(Collectors.joining(","));
        }
        return String.valueOf(value);
    }
}
