using Data.SeaHavenIndustries;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Interfaces;

namespace SeaHaven.Services.Implementation
{
    public class WorkOrderOpsHealthService : IWorkOrderOpsHealthService
    {
        private readonly ApplicationDbContext _db;
        private readonly WorkOrderJobRunStateAccessor _runState;
        private readonly WorkOrderOpsHealthOptions _options;

        public WorkOrderOpsHealthService(
            ApplicationDbContext db,
            WorkOrderJobRunStateAccessor runState,
            IOptions<WorkOrderOpsHealthOptions> options)
        {
            _db = db;
            _runState = runState;
            _options = options.Value;
        }

        public async Task<WorkOrderOpsHealthDto> GetHealthAsync(CancellationToken cancellationToken = default)
        {
            var since = DateTime.UtcNow.AddHours(-24);

            var syncRejected = await _db.WorkOrderAuditLogs
                .CountAsync(l => l.Action == "SyncRejected" && l.CreatedAt >= since, cancellationToken);

            var fieldLocks = await _db.WorkOrderFieldLocks.CountAsync(cancellationToken);

            var state = _runState.State;
            DateTime? ledgerWeekRolled = null;
            if (await _db.WorkOrderWeekRolledLedgers.AnyAsync(cancellationToken))
            {
                ledgerWeekRolled = await _db.WorkOrderWeekRolledLedgers
                    .MaxAsync(l => (DateTime?)l.ProcessedAt, cancellationToken);
            }

            return new WorkOrderOpsHealthDto
            {
                LastWeekRolledRunUtc = state.LastWeekRolledRunUtc ?? ledgerWeekRolled,
                LastPastDueCacheRunUtc = state.LastPastDueCacheRunUtc,
                LastWeekRolledError = state.LastWeekRolledError,
                LastPastDueCacheError = state.LastPastDueCacheError,
                SyncRejectedLast24h = syncRejected,
                FieldLockCount = fieldLocks,
                SyncEnabled = _options.SyncEnabled,
                IngestEnabled = _options.IngestEnabled,
                LegacyDeprecationEnabled = _options.LegacyDeprecationEnabled,
                LegacySunsetDate = _options.LegacySunsetDate,
                CheckedAtUtc = DateTime.UtcNow
            };
        }
    }

    /// <summary>Options bridged from API configuration for health snapshots.</summary>
    public class WorkOrderOpsHealthOptions
    {
        public bool SyncEnabled { get; set; } = true;
        public bool IngestEnabled { get; set; } = true;
        public bool LegacyDeprecationEnabled { get; set; }
        public string? LegacySunsetDate { get; set; }
    }

    /// <summary>Shared in-memory job run timestamps (API hosted services + ops health).</summary>
    public class WorkOrderJobRunStateAccessor
    {
        public WorkOrderJobRunState State { get; } = new();
    }

    public class WorkOrderJobRunState
    {
        public DateTime? LastWeekRolledRunUtc { get; set; }
        public DateTime? LastPastDueCacheRunUtc { get; set; }
        public string? LastWeekRolledError { get; set; }
        public string? LastPastDueCacheError { get; set; }
    }
}