using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using CounterDrone.Core;
using CounterDrone.Core.Algorithms;
using CounterDrone.Core.Models;
using CounterDrone.Core.Repository;
using CounterDrone.Core.Services;
using SQLite;
using Xunit;

namespace CounterDrone.Core.Tests
{
    public class DefenseRecommendationTests : IDisposable
    {
        private readonly string _testDir;
        private readonly IPathProvider _paths;
        private readonly SQLiteConnection _db;
        private readonly ScenarioService _scenario;
        private string _scenarioId = string.Empty;

        public DefenseRecommendationTests()
        {
            _testDir = Path.Combine(Path.GetTempPath(), $"cd_rec_{Guid.NewGuid():N}");
            _paths = new TestPathProvider(_testDir);
            var dbm = new DatabaseManager(_paths);
            _db = dbm.OpenMainDb();

            var planner = new DefensePlanner(
                DefaultData.Load(_paths).Ammunition,
                PlannerConfig.Load(_paths));
            _scenario = new ScenarioService(
                new ScenarioRepository(_db), new CombatSceneRepository(_db),
                new ControlZoneRepository(_db), new ScenarioDroneRepository(_db),
                new ScenarioUnitRepository(_db), new CloudDispersalRepository(_db),
                new RoutePlanRepository(_db), new WaypointRepository(_db),
                _paths, planner);
        }

        public void Dispose()
        {
            _db?.Close();
            if (Directory.Exists(_testDir)) Directory.Delete(_testDir, true);
        }

        [Fact]
        public void GetDefenseRecommendation_PresetScenario_ReturnsBest()
        {
            // 用预设想定
            var results = _scenario.SearchScenarios("活塞", null, null, 1, 10);
            Assert.True(results.TotalCount > 0, "预设想定未找到");
            _scenarioId = results.Items[0].Id;

            var rec = _scenario.GetDefenseRecommendation(_scenarioId);

            Assert.True(rec.Success, $"推荐失败: {rec.Summary}");
            Assert.True(rec.Best.SalvoRounds > 0, "最佳方案弹药数应 > 0");
            Assert.True(rec.Best.EstimatedProbability > 0, "最佳方案概率应 > 0");
            Assert.NotEmpty(rec.Summary);
        }

        [Fact]
        public void GetDefenseRecommendation_NoFireUnits_ReturnsFailure()
        {
            // 创建无火力单元的想定
            var sc = _scenario.CreateScenario("无防御测试", "");
            _scenarioId = sc.Id;
            _scenario.SaveScene(_scenarioId, new CombatScene { WindSpeed = 0, Visibility = 10000 });
            _scenario.SaveScenarioDrone(_scenarioId, TestData.CreateScenarioDrone("default", 1));
            _scenario.SaveRoute(_scenarioId, "default", new RoutePlan { FormationMode = (int)FormationMode.Single },
                new List<Waypoint> {
                    new() { PosX = 0, PosY = 500, PosZ = 0, Speed = 200 },
                    new() { PosX = 10000, PosY = 500, PosZ = 0, Speed = 200 },
                });
            _scenario.SaveCloudDispersal(_scenarioId, new CloudDispersal { AerosolType = (int)AerosolType.InertGas });

            var rec = _scenario.GetDefenseRecommendation(_scenarioId);

            Assert.False(rec.Success);
            Assert.Contains("火力单元", rec.Summary);
        }

        [Fact]
        public void GetDefenseRecommendation_NoPlanner_Throws()
        {
            // 不传 planner 的 ScenarioService
            var svcNoPlanner = new ScenarioService(
                new ScenarioRepository(_db), new CombatSceneRepository(_db),
                new ControlZoneRepository(_db), new ScenarioDroneRepository(_db),
                new ScenarioUnitRepository(_db), new CloudDispersalRepository(_db),
                new RoutePlanRepository(_db), new WaypointRepository(_db));

            Assert.Throws<InvalidOperationException>(() => svcNoPlanner.GetDefenseRecommendation("any"));
        }
    }
}