using System;
using System.Text;
using System.Diagnostics;
using System.Linq;
using Model;

public partial class test_asenumerable_check : System.Web.UI.Page
{
    private StringBuilder output = new StringBuilder();
    private int passCount = 0;
    private int failCount = 0;
    private int warnCount = 0;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            litResult.Text = "<p style='color:#888;'>點擊「執行檢測」開始測試修改結果</p>";
        }
    }

    protected void btnRunTest_Click(object sender, EventArgs e)
    {
        output.Clear();
        passCount = 0;
        failCount = 0;
        warnCount = 0;

        output.AppendLine("<div style='margin-bottom: 20px;'>");
        output.AppendLine($"<p>測試時間: {DateTime.Now:yyyy-MM-dd HH:mm:ss}</p>");
        output.AppendLine("</div>");

        // 執行所有測試
        TestAccountingKind();
        TestActivityKind();
        TestFollowers();
        TestMembers();
        TestOrders();

        // 顯示總結
        output.AppendLine("<hr />");
        output.AppendLine("<h2>📊 測試總結</h2>");
        output.AppendLine($"<p class='success'>✅ 通過: {passCount} 項</p>");
        output.AppendLine($"<p class='error'>❌ 失敗: {failCount} 項</p>");
        output.AppendLine($"<p class='warning'>⚠️ 警告: {warnCount} 項</p>");
        
        if (failCount == 0)
        {
            output.AppendLine("<h3 class='success'>🎉 所有測試通過！修改成功！</h3>");
        }
        else
        {
            output.AppendLine("<h3 class='error'>⚠️ 發現問題，請檢查失敗的項目</h3>");
        }

        litResult.Text = output.ToString();
    }

    private void TestAccountingKind()
    {
        output.AppendLine("<h3>測試 1: accounting_kind 查詢優化</h3>");

        using (var db = new ezEntities())
        {
            var sqlLog = new StringBuilder();
            db.Database.Log = sql => sqlLog.AppendLine(sql);

            try
            {
                // 測試 1.1: 單筆查詢
                sqlLog.Clear();
                var sw = Stopwatch.StartNew();
                var result = db.accounting_kind.Where(q => q.num == 1).FirstOrDefault();
                sw.Stop();

                CheckQuery("單筆查詢 (Where + FirstOrDefault)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveSelectAll: false,
                    maxTime: 50);

                // 測試 1.2: 檢查子資料 (應該用 Any)
                sqlLog.Clear();
                sw.Restart();
                var hasChildren = db.accounting_kind.Any(q => q.root == 1);
                sw.Stop();

                CheckQuery("檢查子資料存在 (Any)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveExists: true,
                    maxTime: 30);

                // 測試 1.3: 取得子資料清單
                sqlLog.Clear();
                sw.Restart();
                var children = db.accounting_kind.Where(q => q.root == 1).ToList();
                sw.Stop();

                CheckQuery("取得子資料清單 (Where + ToList)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveSelectAll: false,
                    maxTime: 100);
            }
            catch (Exception ex)
            {
                LogError($"accounting_kind 測試失敗: {ex.Message}");
            }
        }
    }

    private void TestActivityKind()
    {
        output.AppendLine("<h3>測試 2: activity_kind 查詢優化</h3>");

        using (var db = new ezEntities())
        {
            var sqlLog = new StringBuilder();
            db.Database.Log = sql => sqlLog.AppendLine(sql);

            try
            {
                // 單筆查詢 + 排序
                sqlLog.Clear();
                var sw = Stopwatch.StartNew();
                var result = db.activity_kind
                    .Where(q => q.num == 1)
                    .OrderBy(q => q.kind)
                    .FirstOrDefault();
                sw.Stop();

                CheckQuery("單筆查詢 + 排序 (Where + OrderBy + FirstOrDefault)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveOrderBy: true,
                    maxTime: 50);
            }
            catch (Exception ex)
            {
                LogError($"activity_kind 測試失敗: {ex.Message}");
            }
        }
    }

    private void TestFollowers()
    {
        output.AppendLine("<h3>測試 3: followers 查詢優化</h3>");

        using (var db = new ezEntities())
        {
            var sqlLog = new StringBuilder();
            db.Database.Log = sql => sqlLog.AppendLine(sql);

            try
            {
                // 測試字串查詢 (Contains)
                sqlLog.Clear();
                var sw = Stopwatch.StartNew();
                var result = db.followers
                    .Where(q => q.f_number.Contains("A"))
                    .Take(10)
                    .ToList();
                sw.Stop();

                CheckQuery("字串查詢 (Contains)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveLike: true,
                    maxTime: 100);
            }
            catch (Exception ex)
            {
                LogError($"followers 測試失敗: {ex.Message}");
            }
        }
    }

    private void TestMembers()
    {
        output.AppendLine("<h3>測試 4: members 查詢優化</h3>");

        using (var db = new ezEntities())
        {
            var sqlLog = new StringBuilder();
            db.Database.Log = sql => sqlLog.AppendLine(sql);

            try
            {
                // 測試批次查詢
                var ids = new[] { 1, 2, 3 };
                sqlLog.Clear();
                var sw = Stopwatch.StartNew();
                var result = db.members.Where(q => ids.Contains(q.num)).ToList();
                sw.Stop();

                CheckQuery("批次 ID 查詢 (Contains)", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveIn: true,
                    maxTime: 100);
            }
            catch (Exception ex)
            {
                LogError($"members 測試失敗: {ex.Message}");
            }
        }
    }

    private void TestOrders()
    {
        output.AppendLine("<h3>測試 5: pro_order_detail 聚合查詢</h3>");

        using (var db = new ezEntities())
        {
            var sqlLog = new StringBuilder();
            db.Database.Log = sql => sqlLog.AppendLine(sql);

            try
            {
                // 測試 Count
                sqlLog.Clear();
                var sw = Stopwatch.StartNew();
                var count = db.pro_order_detail.Count(q => q.num > 0);
                sw.Stop();

                CheckQuery("Count 查詢", 
                    sqlLog.ToString(), 
                    sw.ElapsedMilliseconds,
                    shouldHaveWhere: true,
                    shouldHaveCount: true,
                    maxTime: 50);
            }
            catch (Exception ex)
            {
                LogError($"pro_order_detail 測試失敗: {ex.Message}");
            }
        }
    }

    private void CheckQuery(string testName, string sql, long milliseconds, 
        bool shouldHaveWhere = false, 
        bool shouldHaveSelectAll = false,
        bool shouldHaveExists = false,
        bool shouldHaveOrderBy = false,
        bool shouldHaveLike = false,
        bool shouldHaveIn = false,
        bool shouldHaveCount = false,
        long maxTime = 100)
    {
        output.AppendLine("<div class='test-item'>");
        output.AppendLine($"<h4>🔸 {testName}</h4>");
        output.AppendLine($"<p>執行時間: {milliseconds}ms</p>");

        bool passed = true;
        var issues = new StringBuilder();

        // 檢查是否有 WHERE 條件
        if (shouldHaveWhere && !sql.Contains("WHERE"))
        {
            issues.AppendLine("❌ 缺少 WHERE 條件（可能載入整表）<br/>");
            passed = false;
        }

        // 檢查是否有不當的 SELECT *
        if (!shouldHaveSelectAll && sql.Contains("SELECT") && !sql.Contains("WHERE") && !sql.Contains("TOP"))
        {
            issues.AppendLine("❌ SELECT 沒有條件限制（載入整表）<br/>");
            passed = false;
        }

        // 檢查是否使用 EXISTS（Any 應該產生）
        if (shouldHaveExists && !sql.Contains("EXISTS"))
        {
            issues.AppendLine("⚠️ 建議使用 EXISTS 而非載入資料<br/>");
            warnCount++;
        }

        // 檢查是否有 ORDER BY
        if (shouldHaveOrderBy && !sql.Contains("ORDER BY"))
        {
            issues.AppendLine("❌ 缺少 ORDER BY（排序應該在資料庫執行）<br/>");
            passed = false;
        }

        // 檢查是否有 LIKE（Contains 應該產生）
        if (shouldHaveLike && !sql.Contains("LIKE"))
        {
            issues.AppendLine("❌ 字串查詢未轉為 LIKE<br/>");
            passed = false;
        }

        // 檢查是否有 IN（批次查詢應該產生）
        if (shouldHaveIn && !sql.Contains("IN"))
        {
            issues.AppendLine("❌ 批次查詢未轉為 IN<br/>");
            passed = false;
        }

        // 檢查是否有 COUNT（聚合函數應該在資料庫執行）
        if (shouldHaveCount && !sql.Contains("COUNT"))
        {
            issues.AppendLine("❌ COUNT 未在資料庫執行<br/>");
            passed = false;
        }

        // 檢查執行時間
        if (milliseconds > maxTime)
        {
            issues.AppendLine($"⚠️ 執行時間較長 (>{maxTime}ms)，可能仍有優化空間<br/>");
            warnCount++;
        }

        if (passed)
        {
            output.AppendLine("<p class='success'>✅ 測試通過</p>");
            passCount++;
        }
        else
        {
            output.AppendLine("<p class='error'>❌ 測試失敗</p>");
            output.AppendLine($"<div style='color:#f48771;'>{issues}</div>");
            failCount++;
        }

        // 顯示 SQL
        output.AppendLine("<div class='sql-box'>");
        output.AppendLine("<strong>產生的 SQL:</strong><br/>");
        output.AppendLine($"<pre>{System.Web.HttpUtility.HtmlEncode(sql)}</pre>");
        output.AppendLine("</div>");
        output.AppendLine("</div>");
    }

    private void LogError(string message)
    {
        output.AppendLine($"<p class='error'>❌ {message}</p>");
        failCount++;
    }
}