using System.Text.Json;
using Oms.Domain.ChannelsAggregate.Consts;
using Oms.Domain.OrdersAggregate.Entities;

namespace Oms.Application.Services.Orders.Issues;

public static class AutoTriggerConditionMatcher
{
    public static bool Matches(Order order, string? triggerCondition) =>
        Matches(OrderRuleEvaluationContext.FromOrderOnly(order), triggerCondition);

    public static bool Matches(OrderRuleEvaluationContext context, string? triggerCondition)
    {
        var text = triggerCondition?.Trim();
        if (string.IsNullOrWhiteSpace(text))
        {
            return true;
        }

        var parsed = AutoTriggerConditionParser.Parse(text);
        if (ShouldUseFormulaEvaluator(parsed, text))
        {
            if (string.IsNullOrWhiteSpace(parsed.Expression))
            {
                return true;
            }

            if (ChineseFormulaEvaluator.TryEvaluate(parsed.Expression, context, out var result))
            {
                return result;
            }
        }

        if (parsed.IsLegacyJsonMatcher && text.StartsWith('{') && text.EndsWith('}'))
        {
            return MatchesLegacyJson(context.Order, text);
        }

        if (context.Order != null)
        {
            var lowered = text.ToLowerInvariant();
            if (IssueTypeCodes.All.Contains(lowered))
            {
                return true;
            }

            return ContainsKeyword(context.Order, text);
        }

        return false;
    }

    public static string ResolveIssueType(string? triggerCondition)
    {
        var text = triggerCondition?.Trim();
        if (string.IsNullOrWhiteSpace(text))
        {
            return IssueTypeCodes.Other;
        }

        if (text.StartsWith('{') && text.EndsWith('}'))
        {
            try
            {
                using var doc = JsonDocument.Parse(text);
                if (doc.RootElement.TryGetProperty("issueType", out var issueTypeElement))
                {
                    var code = issueTypeElement.GetString()?.Trim().ToLowerInvariant();
                    if (!string.IsNullOrWhiteSpace(code) && IssueTypeCodes.All.Contains(code))
                    {
                        return code;
                    }
                }
            }
            catch (JsonException)
            {
                // fall through
            }
        }

        var lowered = text.ToLowerInvariant();
        if (IssueTypeCodes.All.Contains(lowered))
        {
            return lowered;
        }

        return IssueTypeCodes.Other;
    }

    public static List<int> ParseNotifierUserIds(string? notifier)
    {
        if (string.IsNullOrWhiteSpace(notifier))
        {
            return [];
        }

        return notifier
            .Split([',', ';', ' ', '，'], StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
            .Select(x => int.TryParse(x, out var id) ? id : 0)
            .Where(x => x > 0)
            .Distinct()
            .ToList();
    }

    private static bool ShouldUseFormulaEvaluator(ParsedTriggerCondition parsed, string rawText) =>
        parsed.IsFormulaVersion
        || (!string.IsNullOrWhiteSpace(parsed.Expression) && AutoTriggerConditionParser.LooksLikeFormula(parsed.Expression))
        || (!parsed.IsLegacyJsonMatcher && AutoTriggerConditionParser.LooksLikeFormula(rawText));

    private static bool MatchesLegacyJson(Order? order, string json)
    {
        if (order == null)
        {
            return false;
        }

        try
        {
            using var doc = JsonDocument.Parse(json);
            var root = doc.RootElement;
            if (root.TryGetProperty("orderStatus", out var statusElement))
            {
                var expected = statusElement.GetString()?.Trim();
                if (!string.IsNullOrWhiteSpace(expected)
                    && !string.Equals(order.OrderStatus, expected, StringComparison.OrdinalIgnoreCase))
                {
                    return false;
                }
            }

            if (root.TryGetProperty("productCode", out var productElement))
            {
                var expected = productElement.GetString()?.Trim();
                if (!string.IsNullOrWhiteSpace(expected)
                    && !string.Equals(order.ProductCode?.Trim(), expected, StringComparison.OrdinalIgnoreCase))
                {
                    return false;
                }
            }

            if (root.TryGetProperty("channelCode", out var channelElement))
            {
                var expected = channelElement.GetString()?.Trim();
                if (!string.IsNullOrWhiteSpace(expected)
                    && !string.Equals(order.ChannelCode?.Trim(), expected, StringComparison.OrdinalIgnoreCase))
                {
                    return false;
                }
            }

            if (root.TryGetProperty("keyword", out var keywordElement))
            {
                var keyword = keywordElement.GetString()?.Trim();
                if (!string.IsNullOrWhiteSpace(keyword) && !ContainsKeyword(order, keyword))
                {
                    return false;
                }
            }

            return true;
        }
        catch (JsonException)
        {
            return ContainsKeyword(order, json);
        }
    }

    private static bool ContainsKeyword(Order order, string keyword)
    {
        if (string.IsNullOrWhiteSpace(keyword))
        {
            return true;
        }

        return Contains(order.ServiceNo, keyword)
               || Contains(order.ClientNo, keyword)
               || Contains(order.TrackNo, keyword)
               || Contains(order.ProductCode, keyword)
               || Contains(order.ChannelCode, keyword);
    }

    private static bool Contains(string? source, string keyword) =>
        !string.IsNullOrWhiteSpace(source)
        && source.Contains(keyword, StringComparison.OrdinalIgnoreCase);
}