using System;
using UnityEngine;

namespace Jovian.EncounterSystem {
    /// <summary>
    /// Reference to a dialog line. Looks up <see cref="id"/> inside <see cref="library"/> when both
    /// are set; otherwise falls back to <see cref="inlineText"/>. This lets designers prototype
    /// one-off lines inline and promote common ones to the shared library later without changing
    /// the field's type.
    /// </summary>
    [Serializable]
    public struct DialogLineRef {
        /// <summary>Shared library to resolve <see cref="id"/> against. Optional.</summary>
        public DialogLineLibrary library;

        /// <summary>Line id inside <see cref="library"/>. Ignored if <see cref="library"/> is null.</summary>
        public string id;

        /// <summary>Fallback text used when the library reference is missing or fails to resolve.
        /// Authored directly in the inspector for one-off lines.</summary>
        [TextArea(2, 6)]
        public string inlineText;

        /// <summary>Resolve to final text. Returns <see cref="inlineText"/> if no library reference
        /// resolves, or <c>null</c> if both paths yield nothing.</summary>
        public string Resolve() {
            if(library != null && !string.IsNullOrEmpty(id)) {
                var text = library.Resolve(id);
                if(!string.IsNullOrEmpty(text)) {
                    return text;
                }
            }
            return inlineText;
        }
    }
}