using System.Text.Json;
using AxCopilot.Services.Agent;
using FluentAssertions;
using Xunit;

namespace AxCopilot.Tests.Services;

public class SpawnAgentsToolTests
{
    // ═══════════════════════════════════════════
    //  도구 메타데이터
    // ═══════════════════════════════════════════

    [Fact]
    public void Name_IsSpawnAgents()
    {
        var tool = new SpawnAgentsTool();
        tool.Name.Should().Be("spawn_agents");
    }

    [Fact]
    public void Description_IsNonEmpty()
    {
        var tool = new SpawnAgentsTool();
        tool.Description.Should().NotBeNullOrWhiteSpace();
    }

    [Fact]
    public void Parameters_HasAgentsArray()
    {
        var tool = new SpawnAgentsTool();
        tool.Parameters.Properties.Should().ContainKey("agents");
        tool.Parameters.Required.Should().Contain("agents");
    }

    // ═══════════════════════════════════════════
    //  입력 검증
    // ═══════════════════════════════════════════

    [Fact]
    public async Task ExecuteAsync_MissingAgents_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("{}").RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
        result.Output.Should().Contain("agents");
    }

    [Fact]
    public async Task ExecuteAsync_EmptyAgentsArray_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("""{"agents": []}""").RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
        result.Output.Should().Contain("empty");
    }

    [Fact]
    public async Task ExecuteAsync_MissingId_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("""{"agents": [{"task": "do something"}]}""").RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
    }

    [Fact]
    public async Task ExecuteAsync_MissingTask_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("""{"agents": [{"id": "a1"}]}""").RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
    }

    [Fact]
    public async Task ExecuteAsync_DuplicateIds_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("""
            {
                "agents": [
                    {"id": "a1", "task": "task1"},
                    {"id": "a1", "task": "task2"}
                ]
            }
            """).RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
        result.Output.Should().Contain("Duplicate");
    }

    [Fact]
    public async Task ExecuteAsync_AgentsNotArray_ReturnsFail()
    {
        var tool = new SpawnAgentsTool();
        var json = JsonDocument.Parse("""{"agents": "not an array"}""").RootElement;

        var result = await tool.ExecuteAsync(json, CreateMinimalContext());
        result.Success.Should().BeFalse();
    }

    // ═══════════════════════════════════════════
    //  서브에이전트 재귀 차단 검증
    // ═══════════════════════════════════════════

    [Fact]
    public void AllSubAgentProfiles_DisableSpawnAgents()
    {
        // spawn_agents는 모든 서브에이전트 프로파일에서 비활성화되어야 함 (재귀 방지)
        foreach (var name in SubAgentProfileCatalog.AllProfileNames)
        {
            var profile = SubAgentProfileCatalog.Get(name);
            profile.DisabledToolNames.Should().Contain("spawn_agents",
                $"profile '{name}' should disable spawn_agents to prevent recursion");
        }
    }

    // ═══════════════════════════════════════════
    //  유틸
    // ═══════════════════════════════════════════

    private static AgentContext CreateMinimalContext()
    {
        return new AgentContext
        {
            WorkFolder = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
        };
    }
}