using Xunit;

namespace HikvisionAttendanceService.Tests;

/// <summary>
/// Covers delete-success parsing rules used by USER_DELETE confirmation
/// (regex-based mirror so the test project does not need System.Web.Extensions).
/// </summary>
public class IsapiDeleteSuccessTests
{
    [Theory]
    [InlineData("{\"statusCode\":1,\"statusString\":\"OK\",\"subStatusCode\":\"ok\"}", 200, true)]
    [InlineData("{\n    \"statusCode\": 1,\n    \"statusString\": \"OK\",\n    \"subStatusCode\": \"ok\"\n}", 200, true)]
    [InlineData("{\"statusCode\":\"1\",\"statusString\":\"OK\",\"subStatusCode\":\"ok\"}", 200, true)]
    [InlineData("{ \"statusCode\" : 1 , \"statusString\" : \"OK\" }", 200, true)]
    [InlineData("{\"statusCode\":1,\"subStatusCode\":\"ok\"}", 200, true)]
    [InlineData("{\"statusCode\":1,\"statusString\":\"OK\"}", 200, true)]
    [InlineData("{\"statusCode\":1}", 200, false)]
    [InlineData("{\"statusCode\":4,\"statusString\":\"Invalid Operation\",\"subStatusCode\":\"employeeNoNotExist\"}", 200, false)]
    [InlineData("{\"statusCode\":1,\"statusString\":\"OK\",\"subStatusCode\":\"ok\"}", 400, false)]
    public void Confirmed_delete_success_rules(string body, int httpStatus, bool expected)
    {
        Assert.Equal(expected, IsConfirmed(body, httpStatus));
    }

    [Fact]
    public void Failure_reason_maps_employee_not_found()
    {
        Assert.Equal(
            "Employee was not found on the device",
            Describe(200, 4, "Invalid Operation", "employeeNoNotExist"));
    }

    private static bool IsConfirmed(string? body, int httpStatus)
    {
        if (httpStatus < 200 || httpStatus >= 300)
            return false;
        if (!TryParse(body, out var statusCode, out var statusString, out var subStatusCode))
            return false;
        if (statusCode != 1)
            return false;
        return string.Equals(statusString, "OK", System.StringComparison.OrdinalIgnoreCase)
               || string.Equals(subStatusCode, "ok", System.StringComparison.OrdinalIgnoreCase);
    }

    private static bool TryParse(string? body, out int statusCode, out string statusString, out string subStatusCode)
    {
        statusCode = 0;
        statusString = "";
        subStatusCode = "";
        if (string.IsNullOrWhiteSpace(body))
            return false;

        var mCode = System.Text.RegularExpressions.Regex.Match(body,
            "\"statusCode\"\\s*:\\s*\"?(?<v>-?\\d+)\"?",
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        if (mCode.Success)
            int.TryParse(mCode.Groups["v"].Value, out statusCode);

        var mStr = System.Text.RegularExpressions.Regex.Match(body,
            "\"statusString\"\\s*:\\s*\"(?<v>[^\"]*)\"",
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        if (mStr.Success) statusString = mStr.Groups["v"].Value;

        var mSub = System.Text.RegularExpressions.Regex.Match(body,
            "\"subStatusCode\"\\s*:\\s*\"(?<v>[^\"]*)\"",
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        if (mSub.Success) subStatusCode = mSub.Groups["v"].Value;

        return statusCode != 0 || statusString.Length > 0 || subStatusCode.Length > 0;
    }

    private static string Describe(int httpStatus, int statusCode, string statusString, string subStatusCode)
    {
        if (httpStatus < 200 || httpStatus >= 300)
            return "HTTP " + httpStatus;
        var sub = (subStatusCode ?? "").Trim();
        if (sub.IndexOf("notExist", System.StringComparison.OrdinalIgnoreCase) >= 0 ||
            sub.IndexOf("notFound", System.StringComparison.OrdinalIgnoreCase) >= 0 ||
            sub.Equals("employeeNoNotExist", System.StringComparison.OrdinalIgnoreCase))
            return "Employee was not found on the device";
        if (!string.IsNullOrWhiteSpace(statusString) &&
            !string.Equals(statusString, "OK", System.StringComparison.OrdinalIgnoreCase))
            return statusString.Trim();
        if (statusCode != 0 && statusCode != 1)
            return "Hikvision statusCode=" + statusCode;
        return "device delete rejected";
    }
}