using System.Data;
using System.Globalization;
using MMoneyCoderSharp.Data;

internal static class NxtThemeRestoreDbAudit
{
    private const string ActiveRowsQueryName = "AUDIT_ACTIVE_NXT_THEME_ROWS";

    private const string ActiveRowsSql = """
        SELECT LIST_TEXT
        FROM (
            SELECT p.LIST_TEXT
            FROM DC_LIST d
            JOIN PLAY_LIST p ON p.PG_CODE = d.DC_CODE
            WHERE p.LIST_TEXT LIKE '1^테마_NXT^%'
            ORDER BY d.DC_CODE, TO_NUMBER(p.ITEM_INDEX)
        )
        WHERE ROWNUM <= :row_limit
        """;

    internal static async Task RunAsync(
        IDataQueryExecutor executor,
        CancellationToken cancellationToken)
    {
        const int maximumRows = 1_000;
        var spec = new DataQuerySpec(
            ActiveRowsSql,
            [new DataQueryParameter("row_limit", maximumRows + 1, DbType.Int32)]);
        spec.ValidateFor(DataSourceKind.Oracle);
        var table = await executor.ExecuteAsync(
            DataSourceKind.Oracle,
            ActiveRowsQueryName,
            spec,
            cancellationToken);
        cancellationToken.ThrowIfCancellationRequested();

        if (table.Columns.Count != 1 ||
            table.Columns[0].ColumnName != "LIST_TEXT" ||
            table.Columns[0].DataType != typeof(string) ||
            table.Rows.Count > maximumRows)
        {
            throw new InvalidDataException("The active NXT-theme audit boundary is invalid.");
        }

        var rows = new List<LegacyNamedNxtThemeRestoreRow>(table.Rows.Count);
        var grammar = new Dictionary<string, int>(StringComparer.Ordinal);
        foreach (DataRow dataRow in table.Rows)
        {
            if (dataRow[0] is not string text)
            {
                throw new InvalidDataException("An active NXT-theme row is not text.");
            }

            var fields = text.Split('^');
            if (fields.Length != 7 || fields[0] != "1" || fields[1] != "테마_NXT")
            {
                throw new InvalidDataException("An active NXT-theme row has an invalid shape.");
            }

            var pageText = fields[5].Replace(" ", string.Empty, StringComparison.Ordinal);
            rows.Add(new LegacyNamedNxtThemeRestoreRow(
                rows.Count,
                IsEnabled: true,
                fields[1],
                fields[2],
                fields[3],
                fields[4],
                pageText,
                fields[6]));
            var key = string.Join('|', fields[3], fields[4]);
            grammar[key] = grammar.GetValueOrDefault(key) + 1;
        }

        if (rows.Count == 0)
        {
            Console.WriteLine("NXT_THEME_RESTORE_AUDIT: active=0");
            return;
        }

        var result = await new LegacyNamedNxtThemeRestoreService(executor)
            .ResolveAsync(rows, cancellationToken);
        var resolved = result.Rows.Count(row => row.IsResolved);
        var identityMapped = result.Rows.Count(row => row.ObservedCurrentThemeCode is not null);
        var remapped = result.Rows
            .Select((row, index) =>
                row.ObservedCurrentThemeCode is not null &&
                !string.Equals(
                    row.ObservedCurrentThemeCode,
                    rows[index].DataCode,
                    StringComparison.Ordinal))
            .Count(static value => value);
        var failures = result.Rows
            .Where(row => row.Failure.HasValue)
            .GroupBy(row => row.Failure!.Value)
            .OrderBy(group => group.Key)
            .Select(group => $"{group.Key}={group.Count().ToString(CultureInfo.InvariantCulture)}")
            .ToArray();
        var actions = result.Rows
            .Where(row => row.IsResolved)
            .GroupBy(row => row.Identity!.ActionId)
            .OrderBy(group => group.Key, StringComparer.Ordinal)
            .Select(group => $"{group.Key}={group.Count().ToString(CultureInfo.InvariantCulture)}")
            .ToArray();
        var liveCounts = result.Rows
            .Where(row => row.IsResolved)
            .Select(row => row.Identity!.LiveItemCount)
            .ToArray();

        Console.WriteLine(
            "NXT_THEME_RESTORE_AUDIT: " +
            $"active={rows.Count.ToString(CultureInfo.InvariantCulture)} " +
            $"distinctTitles={rows.Select(row => row.Subject).Distinct(StringComparer.Ordinal).Count().ToString(CultureInfo.InvariantCulture)} " +
            $"grammarVariants={grammar.Count.ToString(CultureInfo.InvariantCulture)} " +
            $"identityMapped={identityMapped.ToString(CultureInfo.InvariantCulture)} " +
            $"resolved={resolved.ToString(CultureInfo.InvariantCulture)} " +
            $"remapped={remapped.ToString(CultureInfo.InvariantCulture)} " +
            $"blocked={(rows.Count - resolved).ToString(CultureInfo.InvariantCulture)} " +
            $"session={LegacyNamedNxtThemeRestoreService.SessionForLocalHour(DateTime.Now.Hour)}");
        Console.WriteLine("NXT_THEME_RESTORE_GRAMMAR: " + string.Join(",", grammar
            .OrderBy(pair => pair.Key, StringComparer.Ordinal)
            .Select(pair => $"{pair.Key}={pair.Value.ToString(CultureInfo.InvariantCulture)}")));
        Console.WriteLine("NXT_THEME_RESTORE_ACTIONS: " +
            (actions.Length == 0 ? "none" : string.Join(",", actions)));
        Console.WriteLine("NXT_THEME_RESTORE_FAILURES: " +
            (failures.Length == 0 ? "none" : string.Join(",", failures)));
        Console.WriteLine("NXT_THEME_RESTORE_LIVE_ITEMS: " +
            (liveCounts.Length == 0
                ? "none"
                : $"min={liveCounts.Min().ToString(CultureInfo.InvariantCulture)}," +
                  $"max={liveCounts.Max().ToString(CultureInfo.InvariantCulture)}," +
                  $"sum={liveCounts.Sum().ToString(CultureInfo.InvariantCulture)}"));
    }
}