using DramaLing.Api.Tests.Integration.Fixtures;
using System.Net;
using System.Net.Http.Json;
using System.Text.Json;

namespace DramaLing.Api.Tests.Integration.EndToEnd;

/// <summary>
/// AI 詞彙生成到儲存完整流程測試
/// 驗證從 AI 分析句子、生成詞彙、同義詞到儲存的完整業務流程
/// </summary>
public class AIVocabularyWorkflowTests : IntegrationTestBase
{
    public AIVocabularyWorkflowTests(DramaLingWebApplicationFactory factory) : base(factory)
    {
    }

    [Fact]
    public async Task CompleteAIVocabularyWorkflow_ShouldGenerateAndStoreFlashcard()
    {
        // Arrange
        var client = CreateTestUser1Client();

        // Step 1: AI 分析句子生成詞彙
        var analysisRequest = new
        {
            text = "The magnificent sunset painted the sky with brilliant colors.",
            targetLevel = "B2",
            includeGrammar = true,
            includeVocabulary = true
        };

        var analysisResponse = await client.PostAsJsonAsync("/api/ai/analyze-sentence", analysisRequest);
        analysisResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var analysisContent = await analysisResponse.Content.ReadAsStringAsync();
        var analysisJson = JsonSerializer.Deserialize<JsonElement>(analysisContent);

        // 驗證 AI 分析結果包含詞彙資訊
        analysisJson.GetProperty("success").GetBoolean().Should().BeTrue();

        // Step 2: 模擬從 AI 分析結果中選擇詞彙並建立詞卡
        // 假設 AI 分析返回了 "magnificent" 這個詞
        var newFlashcard = new
        {
            word = "magnificent",
            translation = "宏偉的，壯麗的",
            definition = "Very beautiful and impressive",
            partOfSpeech = "adjective",
            pronunciation = "/mæɡˈnɪf.ɪ.sənt/",
            example = "The magnificent sunset painted the sky.",
            exampleTranslation = "壯麗的夕陽將天空染色。",
            difficultyLevelNumeric = 4, // B2
            synonyms = "[\"splendid\", \"impressive\", \"gorgeous\"]" // AI 生成的同義詞
        };

        var createResponse = await client.PostAsJsonAsync("/api/flashcards", newFlashcard);
        createResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var createContent = await createResponse.Content.ReadAsStringAsync();
        var createJson = JsonSerializer.Deserialize<JsonElement>(createContent);

        // Step 3: 驗證詞卡已正確儲存
        var createdFlashcardId = createJson.GetProperty("data").GetProperty("id").GetString();
        createdFlashcardId.Should().NotBeNullOrEmpty();

        // Step 4: 取得儲存的詞卡並驗證同義詞
        var getResponse = await client.GetAsync($"/api/flashcards/{createdFlashcardId}");
        getResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var getContent = await getResponse.Content.ReadAsStringAsync();
        var getJson = JsonSerializer.Deserialize<JsonElement>(getContent);

        var flashcard = getJson.GetProperty("data");
        flashcard.GetProperty("word").GetString().Should().Be("magnificent");
        flashcard.GetProperty("synonyms").EnumerateArray().Should().HaveCountGreaterThan(0, "應該有同義詞");
    }

    [Fact]
    public async Task SynonymsGeneration_ShouldBeStoredAndDisplayedCorrectly()
    {
        // Arrange
        var client = CreateTestUser1Client();

        // Step 1: 建立包含同義詞的詞卡
        var flashcardWithSynonyms = new
        {
            word = "brilliant",
            translation = "聰明的，傑出的",
            definition = "Exceptionally clever or talented",
            partOfSpeech = "adjective",
            pronunciation = "/ˈbrɪl.jənt/",
            example = "She has a brilliant mind.",
            exampleTranslation = "她有聰明的頭腦。",
            difficultyLevelNumeric = 3, // B1
            synonyms = "[\"intelligent\", \"smart\", \"clever\", \"outstanding\"]" // JSON 格式的同義詞
        };

        var createResponse = await client.PostAsJsonAsync("/api/flashcards", flashcardWithSynonyms);
        createResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var createContent = await createResponse.Content.ReadAsStringAsync();
        var createJson = JsonSerializer.Deserialize<JsonElement>(createContent);
        var flashcardId = createJson.GetProperty("data").GetProperty("id").GetString();

        // Step 2: 取得詞卡並驗證同義詞正確解析
        var getResponse = await client.GetAsync($"/api/flashcards/{flashcardId}");
        getResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var getContent = await getResponse.Content.ReadAsStringAsync();
        var getJson = JsonSerializer.Deserialize<JsonElement>(getContent);

        var retrievedFlashcard = getJson.GetProperty("data");

        // Step 3: 驗證同義詞格式和內容
        var synonymsArray = retrievedFlashcard.GetProperty("synonyms");
        var synonymsList = synonymsArray.EnumerateArray().Select(s => s.GetString()).ToList();

        synonymsList.Should().Contain("intelligent");
        synonymsList.Should().Contain("smart");
        synonymsList.Should().Contain("clever");
        synonymsList.Should().Contain("outstanding");
        synonymsList.Should().HaveCount(4, "應該有4個同義詞");

        // Step 4: 驗證同義詞在複習時正確顯示
        var dueResponse = await client.GetAsync("/api/flashcards/due");
        var dueContent = await dueResponse.Content.ReadAsStringAsync();
        var dueJson = JsonSerializer.Deserialize<JsonElement>(dueContent);

        var flashcards = dueJson.GetProperty("data").GetProperty("flashcards");
        var targetFlashcard = flashcards.EnumerateArray()
            .FirstOrDefault(f => f.GetProperty("id").GetString() == flashcardId);

        if (!targetFlashcard.Equals(default(JsonElement)))
        {
            var synonymsInDue = targetFlashcard.GetProperty("synonyms");
            synonymsInDue.GetArrayLength().Should().BeGreaterThan(0, "複習時應該顯示同義詞");
        }
    }

    [Fact]
    public async Task OptionsGeneration_ShouldProvideValidDistractors()
    {
        // Arrange
        var client = CreateTestUser1Client();

        // Step 1: 建立詞卡
        var flashcard = new
        {
            word = "extraordinary",
            translation = "非凡的",
            definition = "Very unusual or remarkable",
            partOfSpeech = "adjective",
            difficultyLevelNumeric = 4 // B2
        };

        var createResponse = await client.PostAsJsonAsync("/api/flashcards", flashcard);
        var createContent = await createResponse.Content.ReadAsStringAsync();
        var createJson = JsonSerializer.Deserialize<JsonElement>(createContent);
        var flashcardId = createJson.GetProperty("data").GetProperty("id").GetString();

        // Step 2: 取得詞卡的待複習狀態 (應該包含 AI 生成的選項)
        var dueResponse = await client.GetAsync("/api/flashcards/due");
        dueResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var dueContent = await dueResponse.Content.ReadAsStringAsync();
        var dueJson = JsonSerializer.Deserialize<JsonElement>(dueContent);

        var flashcards = dueJson.GetProperty("data").GetProperty("flashcards");
        var targetFlashcard = flashcards.EnumerateArray()
            .FirstOrDefault(f => f.GetProperty("id").GetString() == flashcardId);

        if (!targetFlashcard.Equals(default(JsonElement)))
        {
            // Step 3: 驗證 AI 生成的測驗選項
            var quizOptions = targetFlashcard.GetProperty("quizOptions");
            quizOptions.GetArrayLength().Should().BeGreaterThan(0, "應該有 AI 生成的測驗選項");

            // 驗證選項不包含正確答案 (混淆選項)
            var optionsList = quizOptions.EnumerateArray().Select(o => o.GetString()).ToList();
            optionsList.Should().NotContain("非凡的", "混淆選項不應該包含正確翻譯");
        }
    }

    [Fact]
    public async Task VocabularyGenerationToReview_EndToEndFlow_ShouldWork()
    {
        // Arrange
        var client = CreateTestUser1Client();

        // Step 1: 從AI分析開始 → Step 2: 生成詞卡 → Step 3: 複習詞卡
        var analysisRequest = new
        {
            text = "The sophisticated algorithm processes complex data efficiently.",
            targetLevel = "C1"
        };

        await client.PostAsJsonAsync("/api/ai/analyze-sentence", analysisRequest);

        // Step 2: 建立從分析中得出的詞彙 (模擬用戶選擇 "algorithm")
        var newFlashcard = new
        {
            word = "algorithm",
            translation = "演算法",
            definition = "A process or set of rules for calculations",
            partOfSpeech = "noun",
            difficultyLevelNumeric = 5, // C1
            synonyms = "[\"procedure\", \"method\", \"process\"]"
        };

        var createResponse = await client.PostAsJsonAsync("/api/flashcards", newFlashcard);
        var createContent = await createResponse.Content.ReadAsStringAsync();
        var createJson = JsonSerializer.Deserialize<JsonElement>(createContent);
        var newFlashcardId = createJson.GetProperty("data").GetProperty("id").GetString();

        // Step 3: 立即複習新詞卡
        var reviewRequest = new
        {
            confidence = 1, // 中等信心度
            wasSkipped = false,
            responseTime = 4000
        };

        var reviewResponse = await client.PostAsJsonAsync($"/api/flashcards/{newFlashcardId}/review", reviewRequest);

        // Assert: 驗證完整流程
        reviewResponse.StatusCode.Should().Be(HttpStatusCode.OK);

        var reviewContent = await reviewResponse.Content.ReadAsStringAsync();
        var reviewJson = JsonSerializer.Deserialize<JsonElement>(reviewContent);

        var reviewResult = reviewJson.GetProperty("data");
        reviewResult.GetProperty("newSuccessCount").GetInt32().Should().Be(1, "新詞卡第一次答對應該成功次數為1");

        // 驗證下次複習間隔
        var nextReviewDate = DateTime.Parse(reviewResult.GetProperty("nextReviewDate").GetString()!);
        var intervalHours = (nextReviewDate - DateTime.UtcNow).TotalHours;
        intervalHours.Should().BeInRange(40, 56, "第一次答對應該約2天後再複習 (2^1 = 2天)");
    }
}