/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

namespace OpenDAL.Tests;

[Collection("BehaviorOperator")]
public sealed class StatBehaviorTest : BehaviorTestBase
{
    private static CancellationToken CT => TestContext.Current.CancellationToken;

    public StatBehaviorTest(BehaviorOperatorFixture fixture)
        : base(fixture)
    {
    }

    [Fact]
    public void StatBehavior_ReturnsFileMetadata()
    {
        if (!Supports(c => c.Stat && c.Write))
        {
            return;
        }

        var path = NewPath("stat-file");
        var content = RandomBytes(333);

        Op.Write(path, content);
        var meta = Op.Stat(path);

        Assert.True(meta.IsFile);
        Assert.Equal((ulong)content.Length, meta.ContentLength);
    }

    [Fact]
    public async Task StatBehavior_ReturnsFileMetadataAsync()
    {
        if (!Supports(c => c.Stat && c.Write))
        {
            return;
        }

        var path = NewPath("stat-file-async");
        var content = RandomBytes(333);

        await Op.WriteAsync(path, content, cancellationToken: CT);
        var meta = await Op.StatAsync(path, null, cancellationToken: CT);

        Assert.True(meta.IsFile);
        Assert.Equal((ulong)content.Length, meta.ContentLength);
    }

    [Fact]
    public void StatBehavior_MissingPath_ReturnsNotFound()
    {
        if (!Supports(c => c.Stat))
        {
            return;
        }

        var ex = Assert.Throws<OpenDALException>(() => Op.Stat(NewPath("stat-missing")));

        Assert.True(IsMissingError(ex));
    }

    [Fact]
    public async Task StatBehavior_MissingPath_ReturnsNotFoundAsync()
    {
        if (!Supports(c => c.Stat))
        {
            return;
        }

        var ex = await Assert.ThrowsAsync<OpenDALException>(() => Op.StatAsync(NewPath("stat-missing-async"), null, cancellationToken: CT));

        Assert.True(IsMissingError(ex));
    }

    [Fact]
    public void StatBehavior_Exists_ReportsPresence()
    {
        if (!Supports(c => c.Stat && c.Write))
        {
            return;
        }

        var path = NewPath("exists");

        Assert.False(Op.Exists(path));

        Op.Write(path, RandomBytes(16));

        Assert.True(Op.Exists(path));
    }

    [Fact]
    public async Task StatBehavior_Exists_ReportsPresenceAsync()
    {
        if (!Supports(c => c.Stat && c.Write))
        {
            return;
        }

        var path = NewPath("exists-async");

        Assert.False(await Op.ExistsAsync(path, CT));

        await Op.WriteAsync(path, RandomBytes(16), cancellationToken: CT);

        Assert.True(await Op.ExistsAsync(path, CT));
    }

    [Fact]
    public void StatBehavior_WithIfModifiedSince_AppliesCondition()
    {
        if (!Supports(c => c.Stat && c.Write && c.StatWithIfModifiedSince))
        {
            return;
        }

        var content = RandomBytes(10);
        var path = NewPath("stat-if-modified-since");
        Op.Write(path, content);

        var meta = Op.Stat(path);
        Assert.True(meta.IsFile);
        Assert.Equal((ulong)content.LongLength, meta.ContentLength);
        Assert.NotNull(meta.LastModified);

        var since = meta.LastModified.Value.AddSeconds(-1);
        var res = Op.Stat(path, new Options.StatOptions { IfModifiedSince = since });
        Assert.Equal(meta.LastModified, res.LastModified);

        // The next timestamp must not be in the future.
        // AWS ignores a future If-Modified-Since and returns 200 instead of 304.
        Thread.Sleep(1000);

        since = meta.LastModified.Value.AddSeconds(1);
        var ex = Assert.Throws<OpenDALException>(() =>
            Op.Stat(path, new Options.StatOptions { IfModifiedSince = since }));

        Assert.Equal(ErrorCode.ConditionNotMatch, ex.Code);
    }
}