import mongoose from "mongoose";

const articleSchema = new mongoose.Schema(
  {
    slug: {
      type: String,
      required: [true, "Slug is required"],
      unique: true,
      lowercase: true,
      trim: true,
      index: true,
    },
    title: {
      type: String,
      required: [true, "Title is required"],
      trim: true,
    },
    content: {
      type: String,
      default: "",
    },
    tags: {
      type: [String],
      default: [],
    },
    // Language this version of the article is written in, as a lowercase
    // ISO 639-1 code ("en", "fr", "de", ...). Defaults to English.
    language: {
      type: String,
      default: "en",
      lowercase: true,
      trim: true,
    },
    // For a translation: the identity of the article it translates — the
    // canonical (original) version's slug. Null on the canonical document.
    baseSlug: {
      type: String,
      default: null,
      lowercase: true,
      trim: true,
      index: true,
    },
  },
  { timestamps: true }
);

// Text index for search across title and tags
articleSchema.index({ title: "text", tags: "text" });

const Article = mongoose.model("Article", articleSchema);

export default Article;