using System.Text.Json;
using Microsoft.EntityFrameworkCore;
using StackExchange.Redis;

public static class DataSeeder
{
    public static async Task SeedAsync(AppDbContext db, IConnectionMultiplexer redis)
    {
        if (await db.Patients.AnyAsync()) return;

        // Two patients
        var patient1 = new Patient
        {
            Id = Guid.NewGuid(), Mrn = "MRN-000001", FirstName = "Jane", LastName = "Smith",
            DateOfBirth = new DateOnly(1975, 4, 12), Gender = "F",
            CreatedAt = DateTimeOffset.UtcNow
        };
        var patient2 = new Patient
        {
            Id = Guid.NewGuid(), Mrn = "MRN-000002", FirstName = "Robert", LastName = "Chen",
            DateOfBirth = new DateOnly(1962, 9, 3), Gender = "M",
            CreatedAt = DateTimeOffset.UtcNow
        };
        db.Patients.AddRange(patient1, patient2);

        // One active inpatient encounter per patient
        var encounter1 = new Encounter
        {
            Id = Guid.NewGuid(), PatientId = patient1.Id, EncounterType = EncounterType.Inpatient,
            Status = EncounterStatus.Active, Department = "ICU",
            AttendingPhysician = "Dr. Osei", AdmittedAt = DateTimeOffset.UtcNow.AddHours(-6),
            CreatedAt = DateTimeOffset.UtcNow.AddHours(-6)
        };
        var encounter2 = new Encounter
        {
            Id = Guid.NewGuid(), PatientId = patient2.Id, EncounterType = EncounterType.Inpatient,
            Status = EncounterStatus.Active, Department = "General Medicine",
            AttendingPhysician = "Dr. Patel", AdmittedAt = DateTimeOffset.UtcNow.AddHours(-12),
            CreatedAt = DateTimeOffset.UtcNow.AddHours(-12)
        };
        db.Encounters.AddRange(encounter1, encounter2);

        // Four alert thresholds
        var thresholds = new List<AlertThreshold>
        {
            new() {
                Id = Guid.NewGuid(), ObservationCode = "HEART_RATE", DisplayName = "Heart Rate",
                Unit = "bpm", CriticalLow = 30, WarningLow = 50, WarningHigh = 100, CriticalHigh = 150,
                CreatedAt = DateTimeOffset.UtcNow
            },
            new() {
                Id = Guid.NewGuid(), ObservationCode = "TEMP_C", DisplayName = "Body Temperature",
                Unit = "°C", CriticalLow = 35.0m, WarningLow = 36.0m, WarningHigh = 38.3m, CriticalHigh = 40.0m,
                CreatedAt = DateTimeOffset.UtcNow
            },
            new() {
                Id = Guid.NewGuid(), ObservationCode = "POTASSIUM_MEQ_L", DisplayName = "Serum Potassium",
                Unit = "mEq/L", CriticalLow = 2.5m, WarningLow = 3.5m, WarningHigh = 5.0m, CriticalHigh = 6.5m,
                CreatedAt = DateTimeOffset.UtcNow
            },
            new() {
                Id = Guid.NewGuid(), ObservationCode = "SPO2", DisplayName = "Oxygen Saturation",
                Unit = "%", CriticalLow = 88, WarningLow = 92, WarningHigh = null, CriticalHigh = null,
                CreatedAt = DateTimeOffset.UtcNow
            }
        };
        db.AlertThresholds.AddRange(thresholds);

        // Observations spanning normal, warning, and critical ranges for encounter1
        var now = DateTimeOffset.UtcNow;
        var observations = new List<Observation>
        {
            // Normal heart rate
            new() { Id = Guid.NewGuid(), EncounterId = encounter1.Id, ObservationCode = "HEART_RATE",
                Value = 78, Unit = "bpm", Source = ObservationSource.Device, RecordedAt = now.AddMinutes(-30), CreatedAt = now.AddMinutes(-30) },
            // Warning heart rate
            new() { Id = Guid.NewGuid(), EncounterId = encounter1.Id, ObservationCode = "HEART_RATE",
                Value = 104, Unit = "bpm", Source = ObservationSource.Device, RecordedAt = now.AddMinutes(-15), CreatedAt = now.AddMinutes(-15) },
            // Critical potassium (low)
            new() { Id = Guid.NewGuid(), EncounterId = encounter1.Id, ObservationCode = "POTASSIUM_MEQ_L",
                Value = 2.3m, Unit = "mEq/L", Source = ObservationSource.Lab, RecordedAt = now.AddMinutes(-10), CreatedAt = now.AddMinutes(-10) },
            // Normal SpO2
            new() { Id = Guid.NewGuid(), EncounterId = encounter1.Id, ObservationCode = "SPO2",
                Value = 97, Unit = "%", Source = ObservationSource.Device, RecordedAt = now.AddMinutes(-5), CreatedAt = now.AddMinutes(-5) },
            // Normal temp for encounter2
            new() { Id = Guid.NewGuid(), EncounterId = encounter2.Id, ObservationCode = "TEMP_C",
                Value = 37.1m, Unit = "°C", Source = ObservationSource.Manual, RecordedAt = now.AddMinutes(-20), CreatedAt = now.AddMinutes(-20) }
        };
        db.Observations.AddRange(observations);

        await db.SaveChangesAsync();

        // Populate Redis cache with the seeded thresholds
        var cache = redis.GetDatabase();
        foreach (var t in thresholds)
        {
            var json = JsonSerializer.Serialize(new
            {
                t.ObservationCode, t.CriticalLow, t.WarningLow, t.WarningHigh, t.CriticalHigh
            });
            await cache.StringSetAsync($"threshold:{t.ObservationCode}", json);
        }
    }
}