namespace SimpleAdmin.Application;

/// <summary>
/// 实现员工端入职资料提交业务能力。
/// </summary>
public class OnboardingPublicSubmissionService : IOnboardingPublicSubmissionService
{
    private readonly SqlSugarScope _db;
    private readonly IOnboardingContractSnapshotService _snapshotService;

    public OnboardingPublicSubmissionService(
        IOnboardingContractSnapshotService snapshotService)
    {
        _db = DbContext.DB;
        _snapshotService = snapshotService;
    }

    /// <summary>
    /// 保存候选人填写的动态字段值。
    /// </summary>
    public async Task SaveDynamicValues(OnboardingSaveDynamicValuesInput input)
    {
        var task = await GetEditableTask(input.Token);
        var requirements = await GetEffectiveFormRequirements(task);
        var fieldIds = input.Values.Select(item => item.FieldId).Distinct().ToList();
        var hasInapplicableField = fieldIds.Any(id => requirements.All(requirement => requirement.FieldId != id));
        if (hasInapplicableField)
            throw Oops.Bah("填写字段不适用于当前公司或岗位");

        var fields = await _db.Queryable<ObFormField>()
            .Where(field => fieldIds.Contains(field.Id) && field.Status == "enable")
            .ToListAsync();
        foreach (var value in input.Values)
        {
            var field = fields.FirstOrDefault(item => item.Id == value.FieldId)
                ?? throw Oops.Bah("填写字段不存在或已停用");
            var old = await _db.Queryable<ObTaskFormValue>()
                .FirstAsync(item => item.TaskId == task.Id && item.FieldId == field.Id);
            var row = new ObTaskFormValue
            {
                Id = old?.Id ?? global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                TaskId = task.Id,
                FieldId = field.Id,
                FieldCode = field.FieldCode,
                FieldName = field.FieldName,
                FieldValue = value.FieldValue,
                SubmitRound = task.SubmitCount + 1
            };

            if (old == null)
            {
                await _db.Insertable(row).ExecuteCommandAsync();
            }
            else
            {
                await _db.Updateable(row).ExecuteCommandAsync();
            }
        }
    }

    /// <summary>
    /// 关联候选人已经上传的系统文件与材料类型。
    /// </summary>
    public async Task SaveMaterial(OnboardingSaveMaterialInput input)
    {
        var task = await GetEditableTask(input.Token);
        var requirements = await GetEffectiveMaterialRequirements(task);
        var materialIsApplicable = requirements.Any(requirement => requirement.MaterialTypeId == input.MaterialTypeId);
        if (!materialIsApplicable)
            throw Oops.Bah("资料类型不适用于当前公司或岗位");

        var material = await _db.Queryable<ObMaterialType>()
            .FirstAsync(item => item.Id == input.MaterialTypeId && item.Status == "enable")
            ?? throw Oops.Bah("资料类型不存在或已停用");
        var fileExists = await _db.Queryable<SysFile>().AnyAsync(item => item.Id == input.FileId);
        if (!fileExists)
            throw Oops.Bah("上传文件不存在");

        var materialCount = await _db.Queryable<ObTaskMaterial>()
            .CountAsync(item => item.TaskId == task.Id && item.MaterialTypeId == input.MaterialTypeId);
        if (materialCount >= material.MaxFileCount)
            throw Oops.Bah("该资料已达到最大上传数量");

        await _db.Insertable(new ObTaskMaterial
        {
            Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
            TaskId = task.Id,
            MaterialTypeId = material.Id,
            MaterialName = material.MaterialName,
            FileId = input.FileId,
            SubmitRound = task.SubmitCount + 1,
            UploadedAt = DateTime.Now
        }).ExecuteCommandAsync();
    }

    /// <summary>
    /// 记录候选人已阅读并确认指定任务合同。
    /// </summary>
    public async Task ConfirmContract(OnboardingConfirmContractInput input)
    {
        var task = await GetEditableTask(input.Token);
        var contract = await _db.Queryable<ObTaskContract>()
            .FirstAsync(item => item.Id == input.TaskContractId && item.TaskId == task.Id)
            ?? throw Oops.Bah("合同不存在");

        contract.ReadAt ??= DateTime.Now;
        contract.ConfirmedAt = DateTime.Now;
        contract.ContractStatus = TaskContractStatus.Confirmed;
        await _db.Updateable(contract).ExecuteCommandAsync();
    }

    /// <summary>
    /// 校验全部必填资料后提交入职任务进入审核。
    /// </summary>
    public async Task Submit(OnboardingSubmitInput input)
    {
        var task = await GetEditableTask(input.Token);
        var info = await _db.Queryable<ObTaskEmployeeInfo>()
            .FirstAsync(item => item.TaskId == task.Id);
        var basicInfoIncomplete = info == null
                                  || string.IsNullOrWhiteSpace(info.EmployeeName)
                                  || string.IsNullOrWhiteSpace(info.Phone)
                                  || string.IsNullOrWhiteSpace(info.IdCardNumber);
        if (basicInfoIncomplete)
            throw Oops.Bah("请先完整填写基本信息");

        await _snapshotService.Build(task.Id, info);

        // 提交时统一完成动态字段、材料、合同变量和合同确认校验，保存阶段只负责暂存。
        var requiredFields = (await GetEffectiveFormRequirements(task))
            .Where(item => item.Required)
            .Select(item => item.FieldId)
            .ToList();
        var values = await _db.Queryable<ObTaskFormValue>()
            .Where(item => item.TaskId == task.Id)
            .ToListAsync();
        var hasMissingRequiredField = requiredFields.Any(
            id => values.All(item => item.FieldId != id || string.IsNullOrWhiteSpace(item.FieldValue)));
        if (hasMissingRequiredField)
            throw Oops.Bah("仍有必填动态信息未填写");

        var requiredMaterials = (await GetEffectiveMaterialRequirements(task))
            .Where(item => item.Required)
            .Select(item => item.MaterialTypeId)
            .ToList();
        var materials = await _db.Queryable<ObTaskMaterial>()
            .Where(item => item.TaskId == task.Id)
            .ToListAsync();
        var hasMissingRequiredMaterial = requiredMaterials.Any(
            id => materials.All(item => item.MaterialTypeId != id));
        if (hasMissingRequiredMaterial)
            throw Oops.Bah("仍有必传资料未上传");

        await EnsureRequiredContractVariables(task);

        var hasUnconfirmedRequiredContract = await _db.Queryable<ObTaskContract>()
            .AnyAsync(item => item.TaskId == task.Id && item.Required && item.ConfirmedAt == null);
        if (hasUnconfirmedRequiredContract)
            throw Oops.Bah("请确认阅读全部必签合同");

        task.TaskStatus = OnboardingTaskStatus.Reviewing;
        task.SubmitCount++;
        task.LastSubmittedAt = DateTime.Now;
        task.RejectReason = null;
        await _db.Updateable(task).ExecuteCommandAsync();

        await _db.Insertable(new ObTaskAudit
        {
            Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
            TaskId = task.Id,
            AuditRound = task.SubmitCount,
            AuditAction = OnboardingAuditAction.Submit,
            AuditOpinion = "员工提交入职资料",
            SnapshotJson = global::System.Text.Json.JsonSerializer.Serialize(new { info, values, materials }),
            AuditedAt = DateTime.Now
        }).ExecuteCommandAsync();
    }

    /// <summary>
    /// 在保存文件前校验材料适用范围、扩展名、大小和数量。
    /// </summary>
    public async Task ValidateMaterialUpload(OnboardingMaterialUploadValidationInput input)
    {
        var task = await GetEditableTask(input.Token);
        var requirements = await GetEffectiveMaterialRequirements(task);
        var materialIsApplicable = requirements.Any(requirement => requirement.MaterialTypeId == input.MaterialTypeId);
        if (!materialIsApplicable)
            throw Oops.Bah("资料类型不适用于当前公司或岗位");

        var material = await _db.Queryable<ObMaterialType>()
            .FirstAsync(item => item.Id == input.MaterialTypeId && item.Status == "enable")
            ?? throw Oops.Bah("资料类型不存在或已停用");
        var suffix = Path.GetExtension(input.FileName).TrimStart('.').ToLowerInvariant();
        var allowedExtensions = (material.AllowedExtensions ?? string.Empty)
            .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
            .Select(item => item.TrimStart('.').ToLowerInvariant());
        var suffixNotAllowed = allowedExtensions.Any() && !allowedExtensions.Contains(suffix);
        if (suffixNotAllowed)
            throw Oops.Bah("该资料不允许上传此文件类型");

        var fileTooLarge = material.MaxFileSizeMb.HasValue
                           && input.FileLength > material.MaxFileSizeMb.Value * 1024L * 1024L;
        if (fileTooLarge)
            throw Oops.Bah("文件超过允许的大小");

        var materialCount = await _db.Queryable<ObTaskMaterial>()
            .CountAsync(item => item.TaskId == task.Id && item.MaterialTypeId == input.MaterialTypeId);
        if (materialCount >= material.MaxFileCount)
            throw Oops.Bah("该资料已达到最大上传数量");
    }

    private async Task EnsureRequiredContractVariables(ObOnboardingTask task)
    {
        var contracts = await _db.Queryable<ObTaskContract>()
            .Where(item => item.TaskId == task.Id)
            .ToListAsync();
        var contractIds = contracts.Select(contract => contract.Id).ToList();
        var templateVersionIds = contracts.Select(contract => contract.TemplateVersionId).ToList();
        var variables = await _db.Queryable<ObTaskContractVariable>()
            .Where(item => contractIds.Contains(item.TaskContractId))
            .ToListAsync();
        var definitions = await _db.Queryable<ObTemplateVariable>()
            .Where(item => templateVersionIds.Contains(item.TemplateVersionId) && item.Required)
            .ToListAsync();
        var missing = contracts
            .SelectMany(contract => definitions
                .Where(definition => definition.TemplateVersionId == contract.TemplateVersionId)
                .Select(definition => new { contract, definition }))
            .FirstOrDefault(item => string.IsNullOrWhiteSpace(
                variables.FirstOrDefault(variable => variable.TaskContractId == item.contract.Id
                                                    && variable.VariableCode == item.definition.VariableCode)
                    ?.VariableValue));
        if (missing != null)
            throw Oops.Bah($"合同“{missing.contract.ContractName}”的必填变量“{missing.definition.VariableName}”尚未填写");
    }

    private async Task<List<ObFormRequirement>> GetEffectiveFormRequirements(ObOnboardingTask task)
    {
        var requirements = await _db.Queryable<ObFormRequirement>()
            .Where(item => item.CompanyId == task.CompanyId
                           && (item.PositionId == null || item.PositionId == task.PositionId))
            .ToListAsync();

        return requirements
            .GroupBy(item => item.FieldId)
            .Select(group => group.FirstOrDefault(item => item.PositionId == task.PositionId) ?? group.First())
            .ToList();
    }

    private async Task<List<ObMaterialRequirement>> GetEffectiveMaterialRequirements(ObOnboardingTask task)
    {
        var requirements = await _db.Queryable<ObMaterialRequirement>()
            .Where(item => item.CompanyId == task.CompanyId
                           && (item.PositionId == null || item.PositionId == task.PositionId))
            .ToListAsync();

        return requirements
            .GroupBy(item => item.MaterialTypeId)
            .Select(group => group.FirstOrDefault(item => item.PositionId == task.PositionId) ?? group.First())
            .ToList();
    }

    private async Task<ObOnboardingTask> GetEditableTask(string token)
    {
        if (string.IsNullOrWhiteSpace(token))
            throw Oops.Bah("入职链接 Token 不能为空");

        var hash = Convert.ToHexString(
            global::System.Security.Cryptography.SHA256.HashData(
                global::System.Text.Encoding.UTF8.GetBytes(token)));
        var link = await _db.Queryable<ObTaskLink>().FirstAsync(item => item.TokenHash == hash)
            ?? throw Oops.Bah("链接不存在");
        var linkUnavailable = link.LinkStatus != OnboardingLinkStatus.Active || link.ExpiresAt <= DateTime.Now;
        if (linkUnavailable)
            throw Oops.Bah("链接已失效");

        var task = await _db.Queryable<ObOnboardingTask>().InSingleAsync(link.TaskId)
            ?? throw Oops.Bah("入职任务不存在");
        var taskNotEditable = task.TaskStatus != OnboardingTaskStatus.PendingFill
                              && task.TaskStatus != OnboardingTaskStatus.Rejected;
        if (taskNotEditable)
            throw Oops.Bah("当前任务不可编辑");

        return task;
    }
}