using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Newtonsoft.Json;
using StarfaceOutlookSync.Models;

namespace StarfaceOutlookSync.Services
{
    public class ProfileManager
    {
        private readonly string _dataDir;
        private readonly string _profilesFile;
        private readonly string _mappingsDir;

        public ProfileManager()
        {
            _dataDir = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
                "StarfaceOutlookSync");
            _mappingsDir = Path.Combine(_dataDir, "mappings");
            _profilesFile = Path.Combine(_dataDir, "profiles.json");

            Directory.CreateDirectory(_dataDir);
            Directory.CreateDirectory(_mappingsDir);
        }

        public List<SyncProfile> GetProfiles()
        {
            try
            {
                if (!File.Exists(_profilesFile)) return new List<SyncProfile>();
                var json = File.ReadAllText(_profilesFile);
                return JsonConvert.DeserializeObject<List<SyncProfile>>(json) ?? new List<SyncProfile>();
            }
            catch { return new List<SyncProfile>(); }
        }

        public void SaveProfiles(List<SyncProfile> profiles)
        {
            var json = JsonConvert.SerializeObject(profiles, Formatting.Indented);
            File.WriteAllText(_profilesFile, json);
        }

        public SyncProfile GetProfile(string id)
        {
            return GetProfiles().FirstOrDefault(p => p.Id == id);
        }

        public void AddProfile(SyncProfile profile)
        {
            var profiles = GetProfiles();
            profiles.Add(profile);
            SaveProfiles(profiles);
        }

        public void UpdateProfile(SyncProfile profile)
        {
            var profiles = GetProfiles();
            var idx = profiles.FindIndex(p => p.Id == profile.Id);
            if (idx >= 0)
            {
                profiles[idx] = profile;
                SaveProfiles(profiles);
            }
        }

        public void DeleteProfile(string id)
        {
            var profiles = GetProfiles().Where(p => p.Id != id).ToList();
            SaveProfiles(profiles);
            var mappingFile = Path.Combine(_mappingsDir, $"{id}.json");
            if (File.Exists(mappingFile)) File.Delete(mappingFile);
        }

        public void UpdateLastSync(string profileId)
        {
            var profiles = GetProfiles();
            var profile = profiles.FirstOrDefault(p => p.Id == profileId);
            if (profile != null)
            {
                profile.LastSync = DateTime.Now.ToString("o");
                SaveProfiles(profiles);
            }
        }

        public List<SyncMapping> GetMappings(string profileId)
        {
            try
            {
                var file = Path.Combine(_mappingsDir, $"{profileId}.json");
                if (!File.Exists(file)) return new List<SyncMapping>();
                return JsonConvert.DeserializeObject<List<SyncMapping>>(File.ReadAllText(file))
                       ?? new List<SyncMapping>();
            }
            catch { return new List<SyncMapping>(); }
        }

        public void SaveMappings(string profileId, List<SyncMapping> mappings)
        {
            var file = Path.Combine(_mappingsDir, $"{profileId}.json");
            File.WriteAllText(file, JsonConvert.SerializeObject(mappings, Formatting.Indented));
        }

        public void AddOrUpdateMapping(SyncMapping mapping)
        {
            var mappings = GetMappings(mapping.ProfileId);
            var existing = mappings.FindIndex(m =>
                m.OutlookEntryId == mapping.OutlookEntryId || m.StarfaceId == mapping.StarfaceId);
            if (existing >= 0)
                mappings[existing] = mapping;
            else
                mappings.Add(mapping);
            SaveMappings(mapping.ProfileId, mappings);
        }

        public string GenerateId()
        {
            return DateTime.Now.Ticks.ToString("x") + Guid.NewGuid().ToString("N").Substring(0, 8);
        }
    }
}