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

namespace MyHomePage.Api.Services;

/// <inheritdoc />
public class SearchEngineService : ISearchEngineService
{
    private readonly ISqlSugarClient _db;
    private readonly SyncLogHelper _sync;

    public SearchEngineService(ISqlSugarClient db, SyncLogHelper sync)
    {
        _db = db;
        _sync = sync;
    }

    /// <inheritdoc />
    public async Task<List<SearchEngineDto>> ListAsync()
    {
        var list = await _db.Queryable<SearchEngine>()
            .OrderBy(e => e.Sort)
            .OrderBy(e => e.Id)
            .ToListAsync();
        return list.Select(SearchEngineDto.FromEntity).ToList();
    }

    /// <inheritdoc />
    public async Task<SearchEngineDto?> GetByIdAsync(int id)
    {
        var e = await _db.Queryable<SearchEngine>().InSingleAsync(id);
        return e is null ? null : SearchEngineDto.FromEntity(e);
    }

    /// <inheritdoc />
    public async Task<SearchEngineDto> CreateAsync(SearchEngineUpsertRequest request)
    {
        Validate(request);
        var now = DateTime.UtcNow;
        var entity = new SearchEngine
        {
            Name = request.Name.Trim(),
            UrlTemplate = request.UrlTemplate.Trim(),
            IconType = request.IconType,
            Icon = request.Icon,
            IconUrl = request.IconUrl,
            ColorBg = request.ColorBg,
            Sort = request.Sort,
            IsDefault = request.IsDefault,
            CreatedAt = now,
            UpdatedAt = now
        };
        entity.Id = await _db.Insertable(entity).ExecuteReturnIdentityAsync();
        if (entity.IsDefault) await ResetDefaultAsync(entity.Id);
        await _sync.WriteAsync("search_engine", entity.Id, "create");
        return SearchEngineDto.FromEntity(entity);
    }

    /// <inheritdoc />
    public async Task<SearchEngineDto> UpdateAsync(int id, SearchEngineUpsertRequest request)
    {
        Validate(request);
        var entity = await _db.Queryable<SearchEngine>().InSingleAsync(id)
            ?? throw new BusinessException("搜索引擎不存在", 404);

        entity.Name = request.Name.Trim();
        entity.UrlTemplate = request.UrlTemplate.Trim();
        entity.IconType = request.IconType;
        entity.Icon = request.Icon;
        entity.IconUrl = request.IconUrl;
        entity.ColorBg = request.ColorBg;
        entity.Sort = request.Sort;
        entity.IsDefault = request.IsDefault;
        entity.UpdatedAt = DateTime.UtcNow;

        await _db.Updateable(entity).ExecuteCommandAsync();
        if (entity.IsDefault) await ResetDefaultAsync(entity.Id);
        await _sync.WriteAsync("search_engine", id, "update");
        return SearchEngineDto.FromEntity(entity);
    }

    /// <inheritdoc />
    public async Task DeleteAsync(int id)
    {
        var entity = await _db.Queryable<SearchEngine>().InSingleAsync(id)
            ?? throw new BusinessException("搜索引擎不存在", 404);
        await _db.Deleteable<SearchEngine>(id).ExecuteCommandAsync();
        await _sync.WriteAsync("search_engine", id, "delete");
    }

    /// <inheritdoc />
    public async Task<SearchEngineDto> SetDefaultAsync(int id)
    {
        var entity = await _db.Queryable<SearchEngine>().InSingleAsync(id)
            ?? throw new BusinessException("搜索引擎不存在", 404);
        await ResetDefaultAsync(id);
        entity.IsDefault = true;
        entity.UpdatedAt = DateTime.UtcNow;
        await _db.Updateable(entity).ExecuteCommandAsync();
        await _sync.WriteAsync("search_engine", id, "update");
        return SearchEngineDto.FromEntity(entity);
    }

    /// <summary>把其他引擎的 IsDefault 全部置为 false</summary>
    private async Task ResetDefaultAsync(int keepId)
    {
        await _db.Updateable<SearchEngine>()
            .SetColumns(e => e.IsDefault == false)
            .Where(e => e.Id != keepId && e.IsDefault)
            .ExecuteCommandAsync();
    }

    private static void Validate(SearchEngineUpsertRequest req)
    {
        if (string.IsNullOrWhiteSpace(req.Name)) throw new BusinessException("名称不能为空", 400);
        if (string.IsNullOrWhiteSpace(req.UrlTemplate)) throw new BusinessException("URL 模板不能为空", 400);
        if (!req.UrlTemplate.Contains("{q}")) throw new BusinessException("URL 模板必须包含 {q} 占位符", 400);
    }
}