// Copyright (c) Microsoft. All rights reserved.

using Microsoft.Extensions.VectorData;

namespace VectorData.ConformanceTests.Support;

#pragma warning disable CA1721 // Property names should not match get methods

/// <summary>
/// A test fixture that sets up a single collection in the test vector store, with a specific record definition
/// and test data.
/// </summary>
public abstract class VectorStoreCollectionFixtureBase<TKey, TRecord> : VectorStoreFixture
    where TKey : notnull
    where TRecord : class
{
    private List<TRecord>? _testData;

    public abstract VectorStoreCollectionDefinition CreateRecordDefinition();
    protected virtual List<TRecord> BuildTestData() => [];

    /// <summary>
    /// The base name for the test collection used in tests, before any provider-specific collection naming rules have been applied.
    /// </summary>
    // TODO: Make protected
    protected abstract string CollectionNameBase { get; }

    /// <summary>
    /// The actual name of the test collection, after any provider-specific collection naming rules have been applied.
    /// </summary>
    public virtual string CollectionName => this.TestStore.AdjustCollectionName(this.CollectionNameBase);

    protected virtual string DistanceFunction => this.TestStore.DefaultDistanceFunction;
    protected virtual string IndexKind => this.TestStore.DefaultIndexKind;

    protected virtual VectorStoreCollection<TKey, TRecord> GetCollection()
        => this.TestStore.CreateCollection<TKey, TRecord>(this.CollectionName, this.CreateRecordDefinition());

    public override async Task InitializeAsync()
    {
        await base.InitializeAsync();

        this.Collection = this.GetCollection();

        if (await this.Collection.CollectionExistsAsync())
        {
            await this.Collection.EnsureCollectionDeletedAsync();
        }

        await this.Collection.EnsureCollectionExistsAsync();
        await this.SeedAsync();
    }

    public virtual VectorStoreCollection<TKey, TRecord> Collection { get; private set; } = null!;

    public List<TRecord> TestData => this._testData ??= this.BuildTestData();

    protected virtual async Task SeedAsync()
    {
        if (this.TestData.Count > 0)
        {
            await this.Collection.UpsertAsync(this.TestData);
            await this.WaitForDataAsync();
        }
    }

    protected virtual Task WaitForDataAsync()
        => this.TestStore.WaitForDataAsync(this.Collection, recordCount: this.TestData.Count);
}
