namespace SimpleAdmin.Application;

/// <summary>
/// 实现基于入职模板创建任务及冻结配置快照的业务能力。
/// </summary>
public class OnboardingTaskService : IOnboardingTaskService
{
    private readonly SqlSugarScope _db;
    private readonly IConfigService _configService;
    private readonly IOnboardingContractSnapshotService _snapshotService;

    public OnboardingTaskService(
        IConfigService configService,
        IOnboardingContractSnapshotService snapshotService)
    {
        _db = DbContext.DB;
        _configService = configService;
        _snapshotService = snapshotService;
    }

    /// <summary>
    /// 校验公司、岗位和入职模板后创建任务，并冻结合同、补充字段及材料要求。
    /// </summary>
    public async Task<OnboardingTaskCreatedOutput> Create(OnboardingTaskCreateInput input)
    {
        var companyEnabled = await _db.Queryable<ObCompany>()
            .AnyAsync(item => item.Id == input.CompanyId && item.Status == "enable");
        if (!companyEnabled)
            throw Oops.Bah("公司不存在或未启用");

        var positionEnabled = await _db.Queryable<ObPosition>()
            .AnyAsync(item => item.Id == input.PositionId
                              && item.CompanyId == input.CompanyId
                              && item.Status == "enable");
        if (!positionEnabled)
            throw Oops.Bah("岗位不存在、未启用或不属于该公司");

        var onboardingTemplate = await _db.Queryable<ObOnboardingTemplate>()
            .FirstAsync(item => item.Id == input.OnboardingTemplateId
                                && item.CompanyId == input.CompanyId
                                && item.Status == "enable")
            ?? throw Oops.Bah("入职模板不存在、未启用或不属于该公司");
        var templateSupportsPosition = await _db.Queryable<ObOnboardingTemplatePosition>()
            .AnyAsync(item => item.OnboardingTemplateId == onboardingTemplate.Id
                              && item.PositionId == input.PositionId);
        if (!templateSupportsPosition)
            throw Oops.Bah("所选入职模板不适用于该岗位");

        var contractConfigs = await _db.Queryable<ObOnboardingTemplateContract>()
            .Where(item => item.OnboardingTemplateId == onboardingTemplate.Id)
            .OrderBy(item => item.SortCode)
            .ToListAsync();
        if (contractConfigs.Count == 0)
            throw Oops.Bah("入职模板尚未配置合同文件");

        var fieldConfigs = await _db.Queryable<ObOnboardingTemplateFormField>()
            .Where(item => item.OnboardingTemplateId == onboardingTemplate.Id)
            .OrderBy(item => item.SortCode)
            .ToListAsync();
        var materialConfigs = await _db.Queryable<ObOnboardingTemplateMaterial>()
            .Where(item => item.OnboardingTemplateId == onboardingTemplate.Id)
            .OrderBy(item => item.SortCode)
            .ToListAsync();

        var templateIds = contractConfigs.Select(item => item.ContractTemplateId).Distinct().ToList();
        var contractTemplates = await _db.Queryable<ObContractTemplate>()
            .Where(item => templateIds.Contains(item.Id))
            .ToListAsync();
        var versionIds = contractConfigs.Select(item => item.ContractTemplateVersionId).Distinct().ToList();
        var enabledVersionCount = await _db.Queryable<ObContractTemplateVersion>()
            .CountAsync(item => versionIds.Contains(item.Id)
                                && item.VersionStatus == ContractTemplateVersionStatus.Enabled);
        if (enabledVersionCount != versionIds.Count)
            throw Oops.Bah("入职模板包含未启用的合同版本，请先调整模板配置");

        var fieldIds = fieldConfigs.Select(item => item.FieldId).Distinct().ToList();
        var fields = fieldIds.Count == 0
            ? new List<ObFormField>()
            : await _db.Queryable<ObFormField>().Where(item => fieldIds.Contains(item.Id)).ToListAsync();
        var materialIds = materialConfigs.Select(item => item.MaterialTypeId).Distinct().ToList();
        var materialTypes = materialIds.Count == 0
            ? new List<ObMaterialType>()
            : await _db.Queryable<ObMaterialType>().Where(item => materialIds.Contains(item.Id)).ToListAsync();

        var expiryConfig = await _configService.GetByConfigKey(
            CateGoryConst.CONFIG_BIZ_DEFINE,
            "onboard.link.expireHours");
        if (expiryConfig == null
            || !int.TryParse(expiryConfig.ConfigValue, out var expiryHours)
            || expiryHours <= 0)
        {
            throw Oops.Bah("请在系统配置中设置 onboard.link.expireHours（正整数小时）");
        }

        var taskId = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId();
        var expiresAt = DateTime.Now.AddHours(expiryHours);
        var token = Guid.NewGuid().ToString("N");
        var task = new ObOnboardingTask
        {
            Id = taskId,
            TaskNo = $"OB{DateTime.Now:yyyyMMddHHmmss}{taskId.ToString()[^4..]}",
            CompanyId = input.CompanyId,
            PositionId = input.PositionId,
            OnboardingTemplateId = onboardingTemplate.Id,
            AssignedReviewerUserId = input.AssignedReviewerUserId,
            LinkExpireAt = expiresAt,
            TaskStatus = OnboardingTaskStatus.PendingFill,
            Remark = input.Remark
        };

        await _db.Ado.BeginTranAsync();
        try
        {
            await _db.Insertable(task).ExecuteCommandAsync();
            await _db.Insertable(new ObTaskLink
            {
                Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                TaskId = taskId,
                TokenHash = Convert.ToHexString(global::System.Security.Cryptography.SHA256.HashData(
                    global::System.Text.Encoding.UTF8.GetBytes(token))),
                ExpiresAt = expiresAt
            }).ExecuteCommandAsync();

            var contracts = contractConfigs.Select(config =>
            {
                var template = contractTemplates.First(item => item.Id == config.ContractTemplateId);
                return new ObTaskContract
                {
                    Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                    TaskId = taskId,
                    TemplateId = config.ContractTemplateId,
                    TemplateVersionId = config.ContractTemplateVersionId,
                    ContractName = template.TemplateName,
                    ContractType = template.ContractType,
                    Required = config.Required,
                    PrintCopies = config.PrintCopies
                };
            }).ToList();
            await _db.Insertable(contracts).ExecuteCommandAsync();

            if (fieldConfigs.Count > 0)
            {
                var fieldSnapshots = fieldConfigs.Select(config =>
                {
                    var field = fields.First(item => item.Id == config.FieldId);
                    return new ObTaskFormRequirement
                    {
                        Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                        TaskId = taskId,
                        FieldId = field.Id,
                        FieldCode = field.FieldCode,
                        FieldName = field.FieldName,
                        DataType = field.DataType,
                        OptionsJson = field.OptionsJson,
                        Required = config.Required,
                        SortCode = config.SortCode
                    };
                }).ToList();
                await _db.Insertable(fieldSnapshots).ExecuteCommandAsync();
            }

            if (materialConfigs.Count > 0)
            {
                var materialSnapshots = materialConfigs.Select(config =>
                {
                    var material = materialTypes.First(item => item.Id == config.MaterialTypeId);
                    return new ObTaskMaterialRequirement
                    {
                        Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                        TaskId = taskId,
                        MaterialTypeId = material.Id,
                        MaterialCode = material.MaterialCode,
                        MaterialName = material.MaterialName,
                        AllowedExtensions = material.AllowedExtensions,
                        MaxFileCount = material.MaxFileCount,
                        MaxFileSizeMb = material.MaxFileSizeMb,
                        Required = config.Required,
                        SortCode = config.SortCode
                    };
                }).ToList();
                await _db.Insertable(materialSnapshots).ExecuteCommandAsync();
            }

            await _snapshotService.Build(taskId);
            await ApplyInitialContractVariables(input.ContractVariables, contracts);
            await _db.Ado.CommitTranAsync();
        }
        catch
        {
            await _db.Ado.RollbackTranAsync();
            throw;
        }

        return new OnboardingTaskCreatedOutput
        {
            TaskId = taskId,
            TaskNo = task.TaskNo,
            LinkToken = token,
            ExpiresAt = expiresAt
        };
    }

    /// <summary>
    /// 校验并保存任务创建时填写的人事合同变量。
    /// </summary>
    private async Task ApplyInitialContractVariables(
        List<OnboardingInitialContractVariableInput> inputs,
        List<ObTaskContract> contracts)
    {
        inputs ??= new List<OnboardingInitialContractVariableInput>();
        var versionIds = contracts.Select(item => item.TemplateVersionId).Distinct().ToList();
        var definitions = await _db.Queryable<ObTemplateVariable>()
            .Where(item => versionIds.Contains(item.TemplateVersionId)
                           && item.HrEditable
                           && (item.VariableType == ContractVariableType.Contract
                               || item.VariableType == ContractVariableType.Company))
            .ToListAsync();

        var duplicateInput = inputs
            .GroupBy(item => new { item.ContractTemplateVersionId, item.VariableCode })
            .FirstOrDefault(group => group.Count() > 1);
        if (duplicateInput != null)
            throw Oops.Bah($"合同变量“{duplicateInput.Key.VariableCode}”重复提交");

        foreach (var input in inputs)
        {
            var definitionExists = definitions.Any(item =>
                item.TemplateVersionId == input.ContractTemplateVersionId
                && item.VariableCode == input.VariableCode);
            if (!definitionExists)
                throw Oops.Bah($"合同变量“{input.VariableCode}”不存在或不允许人事填写");
        }

        var missingRequired = definitions.FirstOrDefault(definition =>
        {
            if (!definition.Required)
                return false;

            var input = inputs.FirstOrDefault(item =>
                item.ContractTemplateVersionId == definition.TemplateVersionId
                && item.VariableCode == definition.VariableCode);
            return string.IsNullOrWhiteSpace(input?.VariableValue ?? definition.DefaultValue);
        });
        if (missingRequired != null)
            throw Oops.Bah($"请填写合同变量“{missingRequired.VariableName}”");

        if (inputs.Count == 0)
            return;

        var contractByVersion = contracts.ToDictionary(item => item.TemplateVersionId);
        var contractIds = contracts.Select(item => item.Id).ToList();
        var rows = await _db.Queryable<ObTaskContractVariable>()
            .Where(item => contractIds.Contains(item.TaskContractId))
            .ToListAsync();

        foreach (var input in inputs)
        {
            var contract = contractByVersion[input.ContractTemplateVersionId];
            var row = rows.FirstOrDefault(item =>
                item.TaskContractId == contract.Id && item.VariableCode == input.VariableCode)
                ?? throw Oops.Bah($"合同变量快照“{input.VariableCode}”不存在");
            row.VariableValue = input.VariableValue;
            row.SourceType = ContractVariableSourceType.HrInput;
            row.IsManualOverride = true;
        }

        var changedRows = rows.Where(item => item.IsManualOverride).ToList();
        if (changedRows.Count > 0)
            await _db.Updateable(changedRows).ExecuteCommandAsync();
    }
}