using Json;

namespace Astralis {

    /// <summary>
    /// Provides typed access to a nested configuration section.
    /// Wraps a Json.Object and provides convenient getter methods with default values.
    /// </summary>
    public class WebConfigSection : GLib.Object {

        private Json.Object section_object;

        /// <summary>
        /// Internal constructor. Creates a new WebConfigSection wrapping the given Json.Object.
        /// </summary>
        /// <param name="obj">The Json.Object to wrap</param>
        internal WebConfigSection(Json.Object obj) {
            this.section_object = obj;
        }

        /// <summary>
        /// Gets a string value from the section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not a string</param>
        /// <returns>The string value or the default</returns>
        public string get_string(string key, string default = "") {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.VALUE) {
                return default;
            }
            return node.get_string() ?? default;
        }

        /// <summary>
        /// Gets an integer value from the section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not an integer</param>
        /// <returns>The integer value or the default</returns>
        public int get_int(string key, int default = 0) {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.VALUE) {
                return default;
            }
            return (int) node.get_int();
        }

        /// <summary>
        /// Gets a 64-bit integer value from the section, without truncating
        /// values outside the range of int (e.g. byte counts).
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not an integer</param>
        /// <returns>The 64-bit integer value or the default</returns>
        public int64 get_int64(string key, int64 default = 0) {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.VALUE) {
                return default;
            }
            return node.get_int();
        }

        /// <summary>
        /// Gets a boolean value from the section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not a boolean</param>
        /// <returns>The boolean value or the default</returns>
        public bool get_bool(string key, bool default = false) {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.VALUE) {
                return default;
            }
            return node.get_boolean();
        }

        /// <summary>
        /// Gets a double value from the section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not a double</param>
        /// <returns>The double value or the default</returns>
        public double get_double(string key, double default = 0.0) {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.VALUE) {
                return default;
            }
            return node.get_double();
        }

        /// <summary>
        /// Gets a string array value from the section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <param name="default">The default value if key is missing or not an array</param>
        /// <returns>The string array or the default</returns>
        public string[] get_string_array(string key, string[] default = {}) {
            if (!section_object.has_member(key)) {
                return default;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.ARRAY) {
                return default;
            }
            var array = node.get_array();
            var result = new string[array.get_length()];
            for (uint i = 0; i < array.get_length(); i++) {
                result[i] = array.get_string_element(i) ?? "";
            }
            return result;
        }

        /// <summary>
        /// Checks if a key exists in this section.
        /// </summary>
        /// <param name="key">The key to check</param>
        /// <returns>True if the key exists, false otherwise</returns>
        public bool has_key(string key) {
            return section_object.has_member(key);
        }

        /// <summary>
        /// Gets all keys in this section.
        /// </summary>
        /// <returns>A list of key names</returns>
        public GLib.List<weak string> get_keys() {
            return section_object.get_members();
        }

        /// <summary>
        /// Gets a nested section from this section.
        /// </summary>
        /// <param name="key">The key to look up</param>
        /// <returns>A WebConfigSection if the key exists and is an object, null otherwise</returns>
        public WebConfigSection? get_section(string key) {
            if (!section_object.has_member(key)) {
                return null;
            }
            var node = section_object.get_member(key);
            if (node.get_node_type() != NodeType.OBJECT) {
                return null;
            }
            return new WebConfigSection(node.get_object());
        }

    }

}