using Data.SeaHavenIndustries;
using Data.SeaHavenIndustries.Enums;
using Microsoft.EntityFrameworkCore;
using SeaHaven.Services.Interfaces;

namespace SeaHaven.Services.Implementation
{
    public class WorkOrderAuditService : IWorkOrderAuditService
    {
        private readonly ApplicationDbContext _context;
        private readonly IWorkOrderFieldLockService _fieldLocks;

        public WorkOrderAuditService(ApplicationDbContext context, IWorkOrderFieldLockService fieldLocks)
        {
            _context = context;
            _fieldLocks = fieldLocks;
        }

        public Task LogStatusChangedAsync(int workOrderId, string? oldStatus, string? newStatus, string? actorId)
            => LogAsync(workOrderId, AuditActionType.StatusChanged, AuditEventType.Manual,
                AuditActorType.Dispatcher, "LifecycleStatus", oldStatus, newStatus, actorId);

        public Task LogAssignmentChangedAsync(int workOrderId, string? oldValue, string? newValue, string? actorId)
            => LogAsync(workOrderId, AuditActionType.AssignmentChanged, AuditEventType.Manual,
                AuditActorType.Dispatcher, "AssignTo", oldValue, newValue, actorId);

        public Task LogSyncRejectedAsync(int workOrderId, string fieldName, string? oldValue, string? newValue)
            => LogAsync(workOrderId, AuditActionType.SyncRejected, AuditEventType.Sync,
                AuditActorType.Sync, fieldName, oldValue, newValue);

        public Task LogWeekRolledAsync(int workOrderId, int oldCarriedOver, int newCarriedOver, string correlationId)
            => LogAsync(
                workOrderId,
                AuditActionType.WeekRolled,
                AuditEventType.System,
                AuditActorType.System,
                "CarriedOver",
                oldCarriedOver.ToString(),
                newCarriedOver.ToString(),
                correlationId: correlationId);

        public void StageFieldChanged(int workOrderId, string fieldName, string? oldValue, string? newValue, string? actorId, int? dispatchId = null)
            => StageAudit(workOrderId, AuditActionType.FieldChanged, fieldName, oldValue, newValue, actorId, dispatchId);

        public void StageStatusChanged(int workOrderId, string? oldStatus, string? newStatus, string? actorId)
            => StageAudit(workOrderId, AuditActionType.StatusChanged, "LifecycleStatus", oldStatus, newStatus, actorId);

        public void StageAssignmentChanged(int workOrderId, string? oldValue, string? newValue, string? actorId)
            => StageAudit(workOrderId, AuditActionType.AssignmentChanged, "AssignTo", oldValue, newValue, actorId);

        public void StageCreated(int workOrderId, string? actorId, string? woNumber)
            => StageAudit(workOrderId, AuditActionType.Create, "WorkOrder", null, woNumber, actorId);

        public async Task LogAsync(
            int workOrderId,
            AuditActionType action,
            AuditEventType eventType,
            AuditActorType actorType,
            string fieldName,
            string? oldValue,
            string? newValue,
            string? actorId = null,
            int? dispatchId = null,
            string? correlationId = null)
        {
            AddAuditEntry(workOrderId, action, eventType, actorType, fieldName, oldValue, newValue, actorId, dispatchId, correlationId);

            if (eventType == AuditEventType.Manual &&
                (action == AuditActionType.FieldChanged ||
                 action == AuditActionType.StatusChanged ||
                 action == AuditActionType.AssignmentChanged))
            {
                await _fieldLocks.LockFieldAsync(workOrderId, fieldName, actorId);
            }

            await _context.SaveChangesAsync();
        }

        private void StageAudit(
            int workOrderId,
            AuditActionType action,
            string fieldName,
            string? oldValue,
            string? newValue,
            string? actorId,
            int? dispatchId = null)
        {
            AddAuditEntry(workOrderId, action, AuditEventType.Manual, AuditActorType.Dispatcher,
                fieldName, oldValue, newValue, actorId, dispatchId);
            StageFieldLock(workOrderId, fieldName, actorId);
        }

        private void AddAuditEntry(
            int workOrderId,
            AuditActionType action,
            AuditEventType eventType,
            AuditActorType actorType,
            string fieldName,
            string? oldValue,
            string? newValue,
            string? actorId,
            int? dispatchId = null,
            string? correlationId = null)
        {
            _context.WorkOrderAuditLogs.Add(new WorkOrderAuditLog
            {
                WorkOrderId = workOrderId,
                UserId = actorId,
                FieldName = fieldName,
                OldValue = oldValue ?? "",
                NewValue = newValue ?? "",
                Action = action.ToString(),
                EventType = eventType.ToString(),
                ActorType = actorType.ToString(),
                DispatchId = dispatchId,
                CorrelationId = correlationId,
                CreatedAt = DateTime.UtcNow
            });
        }

        private void StageFieldLock(int workOrderId, string fieldName, string? userId)
        {
            if (_context.WorkOrderFieldLocks.Local.Any(l =>
                    l.WorkOrderId == workOrderId &&
                    string.Equals(l.FieldName, fieldName, StringComparison.OrdinalIgnoreCase)))
                return;

            var existsInDb = _context.WorkOrderFieldLocks.Any(l =>
                l.WorkOrderId == workOrderId &&
                l.FieldName == fieldName);

            if (existsInDb)
                return;

            _context.WorkOrderFieldLocks.Add(new WorkOrderFieldLock
            {
                WorkOrderId = workOrderId,
                FieldName = fieldName,
                LockedAt = DateTime.UtcNow,
                LockedByUserId = userId
            });
        }
    }
}