namespace SimpleAdmin.Application;

/// <summary>
/// 实现入职业务岗位业务能力。
/// </summary>
public class OnboardingPositionService : DbRepository<ObPosition>, IOnboardingPositionService
{
    /// <summary>
    /// 分页查询入职业务岗位。
    /// </summary>
    public async Task<SqlSugarPagedList<ObPosition>> Page(OnboardingPositionPageInput input)
    {
        var list = await Context.Queryable<ObPosition>()
            .WhereIF(input.CompanyId.HasValue, it => it.CompanyId == input.CompanyId.Value)
            .WhereIF(input.DepartmentId.HasValue, it => it.DepartmentId == input.DepartmentId.Value)
            .WhereIF(!string.IsNullOrWhiteSpace(input.PositionCode), it => it.PositionCode.Contains(input.PositionCode))
            .WhereIF(!string.IsNullOrWhiteSpace(input.PositionName), it => it.PositionName.Contains(input.PositionName))
            .WhereIF(!string.IsNullOrWhiteSpace(input.Status), it => it.Status == input.Status)
            .OrderByIF(!string.IsNullOrWhiteSpace(input.SortField), $"{input.SortField} {input.SortOrder}")
            .OrderByDescending(it => it.CreateTime)
            .OrderBy(it => it.PositionName)
            .ToPagedListAsync(input.PageNum, input.PageSize);

        if (list.List != null && list.List.Any())
        {
            var companyIds = list.List.Select(p => p.CompanyId).Distinct().ToList();
            var departmentIds = list.List.Where(p => p.DepartmentId.HasValue).Select(p => p.DepartmentId.Value).Distinct().ToList();

            var companies = await Context.Queryable<ObCompany>()
                .Where(c => companyIds.Contains(c.Id))
                .ToListAsync();
            var departments = departmentIds.Count == 0
                ? new List<ObDepartment>()
                : await Context.Queryable<ObDepartment>().Where(d => departmentIds.Contains(d.Id)).ToListAsync();

            var companyMap = companies.ToDictionary(c => c.Id, c => c.CompanyName);
            var departmentMap = departments.ToDictionary(d => d.Id, d => d.DepartmentName);

            foreach (var item in list.List)
            {
                if (companyMap.TryGetValue(item.CompanyId, out var cName))
                {
                    item.CompanyName = cName;
                }
                if (item.DepartmentId.HasValue && departmentMap.TryGetValue(item.DepartmentId.Value, out var dName))
                {
                    item.DepartmentName = dName;
                }
            }
        }

        return list;
    }

    /// <summary>
    /// 查询指定公司下全部已启用岗位。
    /// </summary>
    public Task<List<ObPosition>> ListEnabled(long companyId)
    {
        return Context.Queryable<ObPosition>()
            .Where(it => it.CompanyId == companyId && it.Status == "enable")
            .OrderBy(it => it.PositionName)
            .ToListAsync();
    }

    /// <summary>
    /// 查询指定部门下全部已启用岗位。
    /// </summary>
    public Task<List<ObPosition>> ListEnabledByDepartment(long departmentId)
    {
        return Context.Queryable<ObPosition>()
            .Where(it => it.DepartmentId == departmentId && it.Status == "enable")
            .OrderBy(it => it.PositionName)
            .ToListAsync();
    }

    /// <summary>
    /// 查询岗位详情。
    /// </summary>
    public async Task<ObPosition> Detail(BaseIdInput input)
    {
        return await GetByIdAsync(input.Id) ?? throw Oops.Bah("岗位不存在");
    }

    /// <summary>
    /// 新增入职业务岗位。
    /// </summary>
    public async Task Add(OnboardingPositionAddInput input)
    {
        NormalizeInput(input);
        if (!input.DepartmentId.HasValue)
            throw Oops.Bah("请选择所属部门");

        await EnsureCompanyExists(input.CompanyId);
        await EnsureDepartmentExists(input.CompanyId, input.DepartmentId.Value);
        await EnsureCodeUnique(input.CompanyId, input.PositionCode, 0);
        await InsertAsync(input.Adapt<ObPosition>());
    }

    /// <summary>
    /// 编辑入职业务岗位。
    /// </summary>
    public async Task Edit(OnboardingPositionEditInput input)
    {
        NormalizeInput(input);
        if (!input.DepartmentId.HasValue)
            throw Oops.Bah("请选择所属部门");

        var position = await Detail(new BaseIdInput { Id = input.Id });
        await EnsureScopeCanChange(position, input.CompanyId, input.DepartmentId.Value);
        await EnsureCompanyExists(input.CompanyId);
        await EnsureDepartmentExists(input.CompanyId, input.DepartmentId.Value);
        await EnsureCodeUnique(input.CompanyId, input.PositionCode, input.Id);
        await UpdateAsync(input.Adapt<ObPosition>());
    }

    /// <summary>
    /// 删除未被任务或正式员工引用的岗位。
    /// </summary>
    public async Task Delete(BaseIdListInput input)
    {
        if (input.Ids.Count == 0)
            return;

        var hasTasks = await Context.Queryable<ObOnboardingTask>()
            .AnyAsync(it => input.Ids.Contains(it.PositionId));
        if (hasTasks)
            throw Oops.Bah("岗位已有入职任务，不能删除");

        var hasEmployees = await Context.Queryable<ObEmployee>()
            .AnyAsync(it => input.Ids.Contains(it.PositionId));
        if (hasEmployees)
            throw Oops.Bah("岗位已有正式员工，不能删除");

        var hasOnboardingTemplates = await Context.Queryable<ObOnboardingTemplatePosition>()
            .AnyAsync(item => input.Ids.Contains(item.PositionId));
        if (hasOnboardingTemplates)
            throw Oops.Bah("岗位已被入职模板引用，不能删除");

        var hasContractTemplates = await Context.Queryable<ObContractTemplatePosition>()
            .AnyAsync(item => input.Ids.Contains(item.PositionId));
        if (hasContractTemplates)
            throw Oops.Bah("岗位已被合同模板引用，不能删除");

        await DeleteByIdsAsync(input.Ids.Cast<object>().ToArray());
    }

    private async Task EnsureCompanyExists(long companyId)
    {
        var exists = await Context.Queryable<ObCompany>()
            .AnyAsync(it => it.Id == companyId && it.Status == "enable");
        if (!exists)
            throw Oops.Bah("所属公司不存在、已删除或未启用");
    }

    private async Task EnsureDepartmentExists(long companyId, long departmentId)
    {
        var exists = await Context.Queryable<ObDepartment>()
            .AnyAsync(it => it.Id == departmentId
                            && it.CompanyId == companyId
                            && it.Status == "enable");
        if (!exists)
            throw Oops.Bah("所属部门不存在、未启用或不属于该公司");
    }

    /// <summary>
    /// 标准化岗位输入并拒绝非法状态。
    /// </summary>
    private static void NormalizeInput(OnboardingPositionAddInput input)
    {
        input.PositionCode = input.PositionCode?.Trim();
        input.PositionName = input.PositionName?.Trim();
        if (string.IsNullOrWhiteSpace(input.PositionCode)
            || string.IsNullOrWhiteSpace(input.PositionName))
        {
            throw Oops.Bah("请填写岗位编码和岗位名称");
        }

        if (input.Status != "enable" && input.Status != "disable")
            throw Oops.Bah("岗位状态不正确");
    }

    /// <summary>
    /// 已被业务配置或历史数据引用的岗位不允许直接改变公司、部门归属。
    /// </summary>
    private async Task EnsureScopeCanChange(
        ObPosition position,
        long companyId,
        long departmentId)
    {
        if (position.CompanyId == companyId && position.DepartmentId == departmentId)
            return;

        var hasTask = await Context.Queryable<ObOnboardingTask>()
            .AnyAsync(item => item.PositionId == position.Id);
        var hasEmployee = await Context.Queryable<ObEmployee>()
            .AnyAsync(item => item.PositionId == position.Id);
        var hasOnboardingTemplate = await Context.Queryable<ObOnboardingTemplatePosition>()
            .AnyAsync(item => item.PositionId == position.Id);
        var hasContractTemplate = await Context.Queryable<ObContractTemplatePosition>()
            .AnyAsync(item => item.PositionId == position.Id);
        if (hasTask || hasEmployee || hasOnboardingTemplate || hasContractTemplate)
            throw Oops.Bah("岗位已被模板、任务或员工引用，不能直接变更所属公司、部门");
    }

    private async Task EnsureCodeUnique(long companyId, string code, long id)
    {
        var exists = await Context.Queryable<ObPosition>()
            .AnyAsync(it => it.CompanyId == companyId && it.PositionCode == code && it.Id != id);
        if (exists)
            throw Oops.Bah("该公司下岗位编码已存在");
    }
}