using MyHomePage.Api.Models.Dtos;
using MyHomePage.Api.Models.Entities;
using SqlSugar;

namespace MyHomePage.Api.Services;

/// <inheritdoc />
public class SyncService : ISyncService
{
    private readonly ISqlSugarClient _db;

    public SyncService(ISqlSugarClient db) => _db = db;

    /// <inheritdoc />
    public async Task<SyncChangesResponse> GetChangesAsync(DateTime? since)
    {
        // 1. 增量变更记录
        var changesQuery = _db.Queryable<SyncLog>().OrderBy(s => s.Id);
        if (since.HasValue) changesQuery = changesQuery.Where(s => s.Timestamp > since.Value);

        var logs = await changesQuery.ToListAsync();
        var changes = logs.Select(l => new SyncChangeDto
        {
            EntityType = l.EntityType,
            EntityId = l.EntityId,
            Operation = l.Operation,
            Timestamp = l.Timestamp
        }).ToList();

        // 2. 全量快照（无论 since 是否为空都返回，前端可以本地落库）
        var snapshot = new SyncSnapshot();
        var categories = await _db.Queryable<Category>().OrderBy(c => c.Sort).OrderBy(c => c.Id).ToListAsync();
        snapshot.Categories = CategoryDto.BuildTree(categories);

        var bookmarks = await _db.Queryable<Bookmark>().Where(b => !b.IsDeleted)
            .OrderBy(b => b.Sort)
            .OrderBy(b => b.Id)
            .ToListAsync();
        // P28 修复：用 BookmarkDto.FromEntity 共享映射，避免漏字段
        snapshot.Bookmarks = bookmarks.Select(BookmarkDto.FromEntity).ToList();

        var engines = await _db.Queryable<SearchEngine>().OrderBy(e => e.Sort).ToListAsync();
        // P42 修复：用 SearchEngineDto.FromEntity 共享映射（之前手动 new 漏了 IconType/IconUrl/ColorBg，
        // 同步后前端 store 拿到老 DTO，engineLogoStyle 命中兜底色块 → 引擎 logo "消失"）
        snapshot.SearchEngines = engines.Select(SearchEngineDto.FromEntity).ToList();

        var setting = await _db.Queryable<Setting>().InSingleAsync(1);
        if (setting is not null)
        {
            snapshot.Settings = SettingDto.FromEntity(setting);
        }

        return new SyncChangesResponse
        {
            Changes = changes,
            Snapshot = snapshot,
            ServerTime = DateTime.UtcNow
        };
    }
}