using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Haoliang.Models.System;
using Haoliang.Data.Repositories;

namespace Haoliang.Data.Repositories
{
    public interface IAlarmRepository : IRepository<Alarm>
    {
        Task<IEnumerable<Alarm>> GetActiveAlarmsAsync();
        Task<IEnumerable<Alarm>> GetAlarmsByDeviceIdAsync(int deviceId);
        Task<IEnumerable<Alarm>> GetAlarmsByTypeAsync(string alarmType);
        Task<IEnumerable<Alarm>> GetAlarmsByLevelAsync(string alarmLevel);
        Task<IEnumerable<Alarm>> GetUnresolvedAlarmsAsync();
        Task<IEnumerable<Alarm>> GetAlarmsByDateRangeAsync(DateTime startDate, DateTime endDate);
        Task<int> CountActiveAlarmsAsync();
        Task<int> CountAlarmsByTypeAsync(string alarmType);
        Task<decimal> GetAlarmResolutionRateAsync(DateTime startDate, DateTime endDate);
        Task<bool> ResolveAlarmAsync(int alarmId, string resolutionNote, string resolvedBy);
        Task<bool> DeleteOldAlarmsAsync(int keepDays = 90);
    }

    public class AlarmRepository : Repository<Alarm>, IAlarmRepository
    {
        private readonly CNCDbContext _context;

        public AlarmRepository(CNCDbContext context) : base(context)
        {
            _context = context;
        }

        public async Task<IEnumerable<Alarm>> GetActiveAlarmsAsync()
        {
            return await _context.Alarms
                .Where(a => !a.IsResolved)
                .OrderByDescending(a => a.OccurrenceTime)
                .ToListAsync();
        }

        public async Task<IEnumerable<Alarm>> GetAlarmsByDeviceIdAsync(int deviceId)
        {
            return await _context.Alarms
                .Where(a => a.DeviceId == deviceId)
                .OrderByDescending(a => a.OccurrenceTime)
                .ToListAsync();
        }

        public async Task<IEnumerable<Alarm>> GetAlarmsByTypeAsync(string alarmType)
        {
            return await _context.Alarms
                .Where(a => a.AlarmType == alarmType)
                .OrderByDescending(a => a.OccurrenceTime)
                .ToListAsync();
        }

        public async Task<IEnumerable<Alarm>> GetAlarmsByLevelAsync(string alarmLevel)
        {
            return await _context.Alarms
                .Where(a => a.AlarmLevel == alarmLevel)
                .OrderByDescending(a => a.OccurrenceTime)
                .ToListAsync();
        }

        public async Task<IEnumerable<Alarm>> GetUnresolvedAlarmsAsync()
        {
            return await GetActiveAlarmsAsync();
        }

        public async Task<IEnumerable<Alarm>> GetAlarmsByDateRangeAsync(DateTime startDate, DateTime endDate)
        {
            return await _context.Alarms
                .Where(a => a.OccurrenceTime >= startDate && a.OccurrenceTime <= endDate)
                .OrderByDescending(a => a.OccurrenceTime)
                .ToListAsync();
        }

        public async Task<int> CountActiveAlarmsAsync()
        {
            return await _context.Alarms
                .CountAsync(a => !a.IsResolved);
        }

        public async Task<int> CountAlarmsByTypeAsync(string alarmType)
        {
            return await _context.Alarms
                .CountAsync(a => a.AlarmType == alarmType);
        }

        public async Task<decimal> GetAlarmResolutionRateAsync(DateTime startDate, DateTime endDate)
        {
            var alarms = await GetAlarmsByDateRangeAsync(startDate, endDate);
            if (alarms.Any())
            {
                var resolvedCount = alarms.Count(a => a.IsResolved);
                return (decimal)resolvedCount / alarms.Count * 100;
            }
            return 0;
        }

        public async Task<bool> ResolveAlarmAsync(int alarmId, string resolutionNote, string resolvedBy)
        {
            var alarm = await GetByIdAsync(alarmId);
            if (alarm != null)
            {
                alarm.IsResolved = true;
                alarm.ResolutionTime = DateTime.Now;
                alarm.ResolutionNote = resolutionNote;
                
                Update(alarm);
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<bool> DeleteOldAlarmsAsync(int keepDays = 90)
        {
            var cutoffDate = DateTime.Now.AddDays(-keepDays);
            var oldAlarms = await _context.Alarms
                .Where(a => a.OccurrenceTime < cutoffDate)
                .ToListAsync();

            if (oldAlarms.Any())
            {
                RemoveRange(oldAlarms);
                await SaveAsync();
                return true;
            }
            return false;
        }
    }

    public interface IAlarmRuleRepository : IRepository<AlarmRule>
    {
        Task<AlarmRule> GetByNameAsync(string ruleName);
        Task<IEnumerable<AlarmRule>> GetEnabledRulesAsync();
        Task<IEnumerable<AlarmRule>> GetRulesByDeviceIdAsync(int deviceId);
        Task<bool> RuleNameExistsAsync(string ruleName);
        Task<bool> EnableRuleAsync(int ruleId);
        Task<bool> DisableRuleAsync(int ruleId);
    }

    public class AlarmRuleRepository : Repository<AlarmRule>, IAlarmRuleRepository
    {
        private readonly CNCDbContext _context;

        public AlarmRuleRepository(CNCDbContext context) : base(context)
        {
            _context = context;
        }

        public async Task<AlarmRule> GetByNameAsync(string ruleName)
        {
            return await _context.AlarmRules
                .FirstOrDefaultAsync(ar => ar.RuleName == ruleName);
        }

        public async Task<IEnumerable<AlarmRule>> GetEnabledRulesAsync()
        {
            return await _context.AlarmRules
                .Where(ar => ar.IsEnabled)
                .OrderBy(ar => ar.RuleName)
                .ToListAsync();
        }

        public async Task<IEnumerable<AlarmRule>> GetRulesByDeviceIdAsync(int deviceId)
        {
            return await _context.AlarmRules
                .Where(ar => ar.DeviceId == null || ar.DeviceId == deviceId)
                .OrderBy(ar => ar.RuleName)
                .ToListAsync();
        }

        public async Task<bool> RuleNameExistsAsync(string ruleName)
        {
            return await _context.AlarmRules
                .AnyAsync(ar => ar.RuleName == ruleName);
        }

        public async Task<bool> EnableRuleAsync(int ruleId)
        {
            var rule = await GetByIdAsync(ruleId);
            if (rule != null)
            {
                rule.IsEnabled = true;
                rule.UpdatedAt = DateTime.Now;
                
                Update(rule);
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<bool> DisableRuleAsync(int ruleId)
        {
            var rule = await GetByIdAsync(ruleId);
            if (rule != null)
            {
                rule.IsEnabled = false;
                rule.UpdatedAt = DateTime.Now;
                
                Update(rule);
                await SaveAsync();
                return true;
            }
            return false;
        }
    }

    public interface ISystemConfigRepository : IRepository<SystemConfig>
    {
        Task<SystemConfig> GetByKeyAsync(string configKey);
        Task<string> GetConfigValueAsync(string configKey);
        Task<bool> UpdateConfigValueAsync(string configKey, string configValue);
        Task<IEnumerable<SystemConfig>> GetByCategoryAsync(string category);
        Task<bool> ConfigKeyExistsAsync(string configKey);
    }

    public class SystemConfigRepository : Repository<SystemConfig>, ISystemConfigRepository
    {
        private readonly CNCDbContext _context;

        public SystemConfigRepository(CNCDbContext context) : base(context)
        {
            _context = context;
        }

        public async Task<SystemConfig> GetByKeyAsync(string configKey)
        {
            return await _context.SystemConfig
                .FirstOrDefaultAsync(sc => sc.ConfigKey == configKey);
        }

        public async Task<string> GetConfigValueAsync(string configKey)
        {
            var config = await GetByKeyAsync(configKey);
            return config?.ConfigValue;
        }

        public async Task<bool> UpdateConfigValueAsync(string configKey, string configValue)
        {
            var config = await GetByKeyAsync(configKey);
            if (config != null)
            {
                config.ConfigValue = configValue;
                config.UpdatedAt = DateTime.Now;
                
                Update(config);
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<IEnumerable<SystemConfig>> GetByCategoryAsync(string category)
        {
            return await _context.SystemConfig
                .Where(sc => sc.Description?.Contains(category) == true)
                .OrderBy(sc => sc.ConfigKey)
                .ToListAsync();
        }

        public async Task<bool> ConfigKeyExistsAsync(string configKey)
        {
            return await _context.SystemConfig
                .AnyAsync(sc => sc.ConfigKey == configKey);
        }
    }

    public interface IStatisticRuleRepository : IRepository<StatisticRule>
    {
        Task<StatisticRule> GetByNameAsync(string ruleName);
        Task<IEnumerable<StatisticRule>> GetEnabledRulesAsync();
        Task<bool> RuleNameExistsAsync(string ruleName);
        Task<bool> EnableRuleAsync(int ruleId);
        Task<bool> DisableRuleAsync(int ruleId);
    }

    public class StatisticRuleRepository : Repository<StatisticRule>, IStatisticRuleRepository
    {
        private readonly CNCDbContext _context;

        public StatisticRuleRepository(CNCDbContext context) : base(context)
        {
            _context = context;
        }

        public async Task<StatisticRule> GetByNameAsync(string ruleName)
        {
            return await _context.StatisticRules
                .FirstOrDefaultAsync(sr => sr.RuleName == ruleName);
        }

        public async Task<IEnumerable<StatisticRule>> GetEnabledRulesAsync()
        {
            return await _context.StatisticRules
                .Where(sr => sr.IsEnabled)
                .OrderBy(sr => sr.RuleName)
                .ToListAsync();
        }

        public async Task<bool> RuleNameExistsAsync(string ruleName)
        {
            return await _context.StatisticRules
                .AnyAsync(sr => sr.RuleName == ruleName);
        }

        public async Task<bool> EnableRuleAsync(int ruleId)
        {
            var rule = await GetByIdAsync(ruleId);
            if (rule != null)
            {
                rule.IsEnabled = true;
                rule.UpdatedAt = DateTime.Now;
                
                Update(rule);
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<bool> DisableRuleAsync(int ruleId)
        {
            var rule = await GetByIdAsync(ruleId);
            if (rule != null)
            {
                rule.IsEnabled = false;
                rule.UpdatedAt = DateTime.Now;
                
                Update(rule);
                await SaveAsync();
                return true;
            }
            return false;
        }
    }
}