using System.Text.Json;
using QuantEngine.Core.Interfaces;

namespace QuantEngine.Application.Services;

public class DataCollectionService
{
    private readonly IKisApiClient _kisApiClient;
    private readonly ICollectionRepository _repository;

    public DataCollectionService(
        IKisApiClient kisApiClient,
        ICollectionRepository repository)
    {
        _kisApiClient = kisApiClient;
        _repository = repository;
    }

    public async Task<CollectionRunResult> RunCollectionAsync(
        string runId,
        string account,
        List<string> tickers)
    {
        var result = new CollectionRunResult
        {
            RunId = runId,
            StartedAt = KstNowIso(),
            Status = "RUNNING"
        };

        try
        {
            await _repository.SaveRunAsync(new CollectionRunRecord(
                RunId: runId,
                Status: "RUNNING",
                StartedAt: result.StartedAt
            ));

            int successCount = 0;
            int errorCount = 0;

            foreach (var ticker in tickers)
            {
                try
                {
                    var normalized = await CollectOneAsync(ticker, account);
                    var provenance = new Dictionary<string, object>
                    {
                        { "ticker", ticker },
                        { "source", "kis_open_api" }
                    };

                    await _repository.SaveSnapshotAsync(new CollectionSnapshotRecord(
                        RunId: runId,
                        DatasetName: "data_feed",
                        Ticker: ticker,
                        SourceName: "kis_open_api",
                        PayloadJson: JsonSerializer.Serialize(normalized),
                        CapturedAt: KstNowIso()
                    ));

                    successCount++;
                }
                catch (Exception ex)
                {
                    errorCount++;
                    System.Diagnostics.Debug.WriteLine($"Error collecting {ticker}: {ex.Message}");

                    await _repository.SaveErrorAsync(new CollectionErrorRecord(
                        RunId: runId,
                        SourceName: "kis_collector",
                        ErrorKind: ex.GetType().Name,
                        ErrorMessage: ex.Message,
                        Ticker: ticker
                    ));
                }
            }

            var finishedAt = KstNowIso();
            await _repository.UpdateRunStatusAsync(
                runId,
                errorCount == 0 ? "COMPLETED" : "COMPLETED_WITH_ERRORS",
                finishedAt,
                successCount,
                errorCount
            );

            result.Status = errorCount == 0 ? "COMPLETED" : "COMPLETED_WITH_ERRORS";
            result.FinishedAt = finishedAt;
            result.SuccessCount = successCount;
            result.ErrorCount = errorCount;
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine($"Fatal error in collection run {runId}: {ex}");
            await _repository.UpdateRunStatusAsync(runId, "FAILED", KstNowIso());
            result.Status = "FAILED";
            result.ErrorMessage = ex.Message;
        }

        return result;
    }

    private async Task<Dictionary<string, object>> CollectOneAsync(string ticker, string account)
    {
        var normalized = new Dictionary<string, object> { { "ticker", ticker } };

        try
        {
            var price = await _kisApiClient.GetCurrentPriceAsync(ticker, account);
            normalized["current_price"] = CoerceFloat(FindFirstValue(price, "stck_prpr", "stck_clpr", "close"));
            normalized["open"] = CoerceFloat(FindFirstValue(price, "stck_oprc", "open"));
            normalized["high"] = CoerceFloat(FindFirstValue(price, "stck_hgpr", "high"));
            normalized["low"] = CoerceFloat(FindFirstValue(price, "stck_lwpr", "low"));
            normalized["prev_close"] = CoerceFloat(FindFirstValue(price, "prdy_vrss"));
            normalized["volume"] = CoerceFloat(FindFirstValue(price, "acml_vol", "volume"));
            normalized["change_pct"] = CoerceFloat(FindFirstValue(price, "prdy_ctrt"));
            normalized["price_status"] = "OK";
        }
        catch (Exception ex)
        {
            normalized["price_status"] = "ERROR";
            normalized["price_error"] = ex.Message;
        }

        try
        {
            var orderbook = await _kisApiClient.GetAskingPrice10LevelAsync(ticker, account);
            var output1 = ExtractObject(orderbook, "output1");
            normalized["ask_1"] = CoerceFloat(FindFirstValue(output1, "askp1"));
            normalized["bid_1"] = CoerceFloat(FindFirstValue(output1, "bidp1"));
            normalized["orderbook_status"] = "OK";
        }
        catch (Exception ex)
        {
            normalized["orderbook_status"] = "ERROR";
            normalized["orderbook_error"] = ex.Message;
        }

        try
        {
            var start = DateTime.Now.AddDays(-10).ToString("yyyyMMdd");
            var end = DateTime.Now.ToString("yyyyMMdd");
            var shortSale = await _kisApiClient.GetDailyShortSaleAsync(ticker, start, end, account);
            var rows = ExtractArray(shortSale, "output2");
            if (rows.Count > 0 && rows[0] is Dictionary<string, object> latest)
            {
                normalized["short_turnover_share"] = CoerceFloat(latest.GetValueOrDefault("ssts_vol_rlim"));
            }
            normalized["short_sale_status"] = "OK";
        }
        catch (Exception ex)
        {
            normalized["short_sale_status"] = "ERROR";
            normalized["short_sale_error"] = ex.Message;
        }

        normalized["collection_as_of"] = KstNowIso();
        return normalized;
    }

    private static object? FindFirstValue(Dictionary<string, object> payload, params string[] keys)
    {
        var stack = new Stack<object>();
        stack.Push(payload);

        while (stack.Count > 0)
        {
            var item = stack.Pop();
            if (item is Dictionary<string, object> dict)
            {
                foreach (var key in keys)
                {
                    if (dict.TryGetValue(key, out var value) && value != null && !string.IsNullOrEmpty(value.ToString()))
                        return value;
                }
                foreach (var value in dict.Values)
                    if (value != null) stack.Push(value);
            }
            else if (item is JsonElement elem && elem.ValueKind == System.Text.Json.JsonValueKind.Object)
            {
                foreach (var key in keys)
                {
                    if (elem.TryGetProperty(key, out var prop) && prop.ValueKind != System.Text.Json.JsonValueKind.Null)
                        return prop;
                }
                foreach (var prop in elem.EnumerateObject())
                    stack.Push(prop.Value);
            }
        }
        return null;
    }

    private static double? CoerceFloat(object? value)
    {
        if (value == null || string.IsNullOrEmpty(value.ToString()))
            return null;
        try
        {
            var str = value.ToString()?.Replace(",", "").Replace("%", "") ?? "";
            return double.TryParse(str, out var d) ? d : null;
        }
        catch { return null; }
    }

    private static Dictionary<string, object> ExtractObject(Dictionary<string, object> payload, string key)
    {
        if (payload.TryGetValue(key, out var value) && value is Dictionary<string, object> dict)
            return dict;
        if (value is JsonElement elem && elem.ValueKind == System.Text.Json.JsonValueKind.Object)
            return JsonSerializer.Deserialize<Dictionary<string, object>>(elem.GetRawText()) ?? new();
        return new();
    }

    private static List<object> ExtractArray(Dictionary<string, object> payload, string key)
    {
        if (payload.TryGetValue(key, out var value))
        {
            if (value is List<object> list) return list;
            if (value is JsonElement elem && elem.ValueKind == System.Text.Json.JsonValueKind.Array)
                return JsonSerializer.Deserialize<List<object>>(elem.GetRawText()) ?? new();
        }
        return new();
    }

    private static string KstNowIso() =>
        DateTime.Now.ToString("o");
}

public class CollectionRunResult
{
    public string RunId { get; set; } = "";
    public string Status { get; set; } = "";
    public string StartedAt { get; set; } = "";
    public string? FinishedAt { get; set; }
    public int SuccessCount { get; set; }
    public int ErrorCount { get; set; }
    public string? ErrorMessage { get; set; }
}