/**
 * provider.ts - Embedding provider abstraction
 *
 * Defines the EmbeddingProvider interface that allows qmd to use either:
 *   - LocalLlamaCppProvider (legacy, GGUF via node-llama-cpp)
 *   - OpenAIEmbeddingsProvider (HTTP, OpenAI-compatible endpoint like ai.mm.mk)
 *
 * The factory in `./factory.ts` selects an implementation based on env vars,
 * a CLI flag, or `~/.config/qmd/config.json`.
 */
/**
 * Error thrown when the provider's reported model id does not match the
 * model id baked into existing `content_vectors` rows. Forces user to
 * re-embed (`qmd embed -f`) or pin the matching model id.
 */
export class ModelMismatchError extends Error {
    providerModel;
    existingModels;
    constructor(providerModel, existingModels) {
        const list = existingModels.join(", ");
        super(`Embedding model mismatch: existing vectors use model(s) [${list}] ` +
            `but the configured provider reports "${providerModel}". ` +
            `Run \`qmd embed -f\` (or \`--rebuild\`) to re-embed everything with ` +
            `the new model, or set QMD_EMBED_MODEL_ID="${existingModels[0] ?? ""}" ` +
            `to keep the existing vectors.`);
        this.name = "ModelMismatchError";
        this.providerModel = providerModel;
        this.existingModels = existingModels;
    }
}
/**
 * Verify that the provider's model id is compatible with the existing
 * `content_vectors` entries. Pass-through (no-op) if the table is empty
 * (fresh DB) or if the model id appears in the distinct set.
 *
 * Caller passes `existingModels` (typically result of
 * `SELECT DISTINCT model FROM content_vectors`).
 */
export function assertModelCompatible(providerModel, existingModels) {
    // Empty DB — nothing to compare against, anything goes.
    if (existingModels.length === 0)
        return;
    if (existingModels.includes(providerModel))
        return;
    throw new ModelMismatchError(providerModel, existingModels);
}