using AxCopilot.Models;
using AxCopilot.Services.Agent;
using FluentAssertions;
using Xunit;

namespace AxCopilot.Tests.Services;

public class AgentQueryContextBuilderTests
{
    [Fact]
    public void Build_ShouldPopulateMissingToolResultPreviewBeforeCreatingQueryView()
    {
        var longContent = new string('Z', 1800);
        var sourceMessages = new List<ChatMessage>
        {
            new()
            {
                MsgId = "tool-source-1",
                Role = "user",
                Content = $$"""{"type":"tool_result","tool_use_id":"call-view","tool_name":"file_read","content":"{{longContent}}"}""",
                QueryPreviewContent = """{"type":"tool_result","tool_use_id":"call-view","tool_name":"file_read","content":"preview-view"}"""
            },
            new()
            {
                MsgId = "tool-source-2",
                Role = "user",
                Content = $$"""{"type":"tool_result","tool_use_id":"call-view","tool_name":"file_read","content":"{{longContent}}"}"""
            },
            new()
            {
                MsgId = "tail-1",
                Role = "assistant",
                Content = "recent tail"
            }
        };

        var result = AgentQueryContextBuilder.Build(sourceMessages);

        sourceMessages[1].QueryPreviewContent.Should().Be(sourceMessages[0].QueryPreviewContent);
        result.Messages[1].QueryPreviewContent.Should().Be(sourceMessages[0].QueryPreviewContent);
    }

    [Fact]
    public void Build_ShouldSynthesizeToolResultPreview_WhenNoStoredPreviewExists()
    {
        var longContent = string.Join(' ', Enumerable.Repeat("long tool output", 120));
        var sourceMessages = new List<ChatMessage>
        {
            new()
            {
                MsgId = "tool-source-1",
                Role = "user",
                Content = $$"""{"type":"tool_result","tool_use_id":"call-synth-view","tool_name":"file_read","content":"{{longContent}}"}"""
            },
            new()
            {
                MsgId = "tail-1",
                Role = "assistant",
                Content = "recent tail"
            }
        };

        var result = AgentQueryContextBuilder.Build(sourceMessages);

        sourceMessages[0].QueryPreviewContent.Should().NotBeNullOrWhiteSpace();
        sourceMessages[0].QueryPreviewContent.Should().Contain("call-synth-view");
        result.Messages.Should().Contain(message =>
            message.QueryPreviewContent != null &&
            message.QueryPreviewContent.Contains("call-synth-view", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Build_ShouldExposeCodeProfileMetadata()
    {
        var sourceMessages = new List<ChatMessage>
        {
            new()
            {
                MsgId = "tool-source-1",
                Role = "user",
                Content = """{"type":"tool_result","tool_use_id":"call-code","tool_name":"build_run","content":"short"}"""
            },
            new()
            {
                MsgId = "tail-1",
                Role = "assistant",
                Content = "recent tail"
            }
        };

        var result = AgentQueryContextBuilder.Build(
            sourceMessages,
            AgentQueryContextBuilder.AgentQueryContextBuildOptions.CreateCodeDefault());

        result.ProfileName.Should().Be("code");
        result.ProtectedRecentNonSystemMessages.Should().BeGreaterThan(8);
        result.ToolResultAggregateBudgetChars.Should().BeGreaterThan(AgentToolResultBudget.DefaultAggregateBudgetChars);
    }

    [Fact]
    public void Build_ShouldRestoreRecentCompactedToolSnippetsIntoPostCompactContextMessage()
    {
        var sourceMessages = new List<ChatMessage>
        {
            new()
            {
                MsgId = "tool-call-1",
                Role = "assistant",
                Content = """{"_tool_use_blocks":[{"type":"tool_use","id":"call-restore","name":"file_read","input":{"path":"MainWindow.xaml"}}]}"""
            },
            new()
            {
                MsgId = "tool-result-1",
                Role = "user",
                Content = """{"type":"tool_result","tool_use_id":"call-restore","tool_name":"file_read","content":"<Window Title=\"Preview\" />"}"""
            },
            new()
            {
                MsgId = "boundary-1",
                Role = "system",
                MetaKind = "microcompact_boundary",
                Content = "[previous conversation summary]"
            },
            new()
            {
                MsgId = "tail-1",
                Role = "assistant",
                Content = "recent tail"
            }
        };

        var result = AgentQueryContextBuilder.Build(sourceMessages);
        var postCompactMessage = result.Messages.Single(message => message.MetaKind == "post_compact_context");

        postCompactMessage.Content.Should().Contain("recent compacted tool trace:");
        postCompactMessage.Content.Should().Contain("file_read result:");
    }
}