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

namespace AxCopilot.Tests.Services;

public class ContextCondenserTests
{
    [Fact]
    public async Task CondenseIfNeededAsync_WhenProactiveDisabled_ShouldNotChangeMessages()
    {
        var settings = new SettingsService();
        settings.Settings.Llm.Service = "ollama";
        settings.Settings.Llm.Model = "test-model";

        using var llm = new LlmService(settings);
        var messages = BuildLargeConversation();
        var before = messages.Select(m => m.Content).ToList();

        var changed = await ContextCondenser.CondenseIfNeededAsync(
            messages,
            llm,
            maxOutputTokens: 2_000,
            proactiveEnabled: false,
            triggerPercent: 80,
            force: false,
            CancellationToken.None);

        changed.Should().BeFalse();
        messages.Select(m => m.Content).Should().Equal(before);
    }

    [Fact]
    public async Task CondenseIfNeededAsync_ShouldTruncateLargeToolResult_WithoutSummarizeCall()
    {
        var settings = new SettingsService();
        settings.Settings.Llm.Service = "ollama";
        settings.Settings.Llm.Model = "test-model";

        using var llm = new LlmService(settings);
        var messages = BuildLargeConversation();

        var changed = await ContextCondenser.CondenseIfNeededAsync(
            messages,
            llm,
            maxOutputTokens: 2_000,
            proactiveEnabled: true,
            triggerPercent: 80,
            force: false,
            CancellationToken.None);

        changed.Should().BeTrue();
        messages.Any(m => (m.Content ?? "").Contains("[축약됨", StringComparison.Ordinal)).Should().BeTrue();
    }

    private static List<ChatMessage> BuildLargeConversation()
    {
        var largeOutput = new string('A', 9_000);
        var toolJson = "{\"type\":\"tool_result\",\"output\":\"" + largeOutput + "\",\"success\":true}";

        return
        [
            new ChatMessage { Role = "system", Content = "system prompt" },
            new ChatMessage { Role = "user", Content = "첫 질문" },
            new ChatMessage { Role = "assistant", Content = toolJson }, // 오래된 구간에 배치
            new ChatMessage { Role = "assistant", Content = "첫 답변" },
            new ChatMessage { Role = "user", Content = "둘째 질문" },
            new ChatMessage { Role = "assistant", Content = "둘째 답변" },
            new ChatMessage { Role = "user", Content = "셋째 질문" },
            new ChatMessage { Role = "assistant", Content = "셋째 답변" },
            new ChatMessage { Role = "user", Content = "넷째 질문" },
            new ChatMessage { Role = "assistant", Content = "넷째 답변" },
            new ChatMessage { Role = "user", Content = "다섯째 질문" },
            new ChatMessage { Role = "assistant", Content = "다섯째 답변" },
        ];
    }
}