using System.Text.Json.Nodes;
using StellaOps.Findings.Ledger.Domain;
using StellaOps.Findings.Ledger.WebService.Contracts;

namespace StellaOps.Findings.Ledger.WebService.Mappings;

public static class LedgerEventMapping
{
    public static LedgerEventDraft ToDraft(this LedgerEventRequest request, TimeProvider? timeProvider = null)
    {
        ArgumentNullException.ThrowIfNull(request);

        timeProvider ??= TimeProvider.System;
        var recordedAt = (request.RecordedAt ?? timeProvider.GetUtcNow()).ToUniversalTime();
        var payload = request.Payload is null ? new JsonObject() : (JsonObject)request.Payload.DeepClone();

        var eventObject = new JsonObject
        {
            ["id"] = request.EventId.ToString(),
            ["type"] = request.EventType,
            ["tenant"] = request.TenantId,
            ["chainId"] = request.ChainId.ToString(),
            ["sequence"] = request.Sequence,
            ["policyVersion"] = request.PolicyVersion,
            ["artifactId"] = request.ArtifactId,
            ["finding"] = new JsonObject
            {
                ["id"] = request.Finding.Id,
                ["artifactId"] = request.Finding.ArtifactId ?? request.ArtifactId,
                ["vulnId"] = request.Finding.VulnId
            },
            ["actor"] = new JsonObject
            {
                ["id"] = request.Actor.Id,
                ["type"] = request.Actor.Type
            },
            ["occurredAt"] = FormatTimestamp(request.OccurredAt),
            ["recordedAt"] = FormatTimestamp(recordedAt),
            ["payload"] = payload
        };

        if (request.SourceRunId is Guid sourceRunId && sourceRunId != Guid.Empty)
        {
            eventObject["sourceRunId"] = sourceRunId.ToString();
        }

        var envelope = new JsonObject
        {
            ["event"] = eventObject
        };

        return new LedgerEventDraft(
            request.TenantId,
            request.ChainId,
            request.Sequence,
            request.EventId,
            request.EventType,
            request.PolicyVersion,
            request.Finding.Id,
            request.ArtifactId,
            request.SourceRunId,
            request.Actor.Id,
            request.Actor.Type,
            request.OccurredAt.ToUniversalTime(),
            recordedAt,
            payload,
            envelope,
            request.PreviousHash);
    }

    private static string FormatTimestamp(DateTimeOffset value)
        => value.ToUniversalTime().ToString("yyyy-MM-dd'T'HH:mm:ss.fff'Z'");
}