using System.Globalization;

namespace SimpleAdmin.Application;

/// <summary>
/// 在正式员工建档时，将每份任务合同及其全部变量冻结为长期业务快照。
/// </summary>
public class OnboardingEmployeeContractSnapshotService : IOnboardingEmployeeContractSnapshotService
{
    private readonly SqlSugarScope _db;

    public OnboardingEmployeeContractSnapshotService()
    {
        _db = DbContext.DB;
    }

    /// <inheritdoc />
    public async Task Build(long employeeId, long taskId)
    {
        var contracts = await _db.Queryable<ObTaskContract>()
            .Where(item => item.TaskId == taskId)
            .OrderBy(item => item.Id)
            .ToListAsync();
        if (contracts.Count == 0)
            throw Oops.Bah("入职任务没有合同，无法生成员工合同快照");

        var contractIds = contracts.Select(item => item.Id).ToList();
        var allVariables = await _db.Queryable<ObTaskContractVariable>()
            .Where(item => contractIds.Contains(item.TaskContractId))
            .OrderBy(item => item.SortCode)
            .OrderBy(item => item.Id)
            .ToListAsync();
        var now = DateTime.Now;
        var snapshots = new List<ObEmployeeContractSnapshot>();

        foreach (var contract in contracts)
        {
            var variables = allVariables
                .Where(item => item.TaskContractId == contract.Id)
                .OrderBy(item => item.SortCode)
                .ThenBy(item => item.Id)
                .ToList();
            var valueMap = variables
                .GroupBy(item => item.VariableCode, StringComparer.OrdinalIgnoreCase)
                .ToDictionary(
                    group => group.Key,
                    group => group.Last().VariableValue,
                    StringComparer.OrdinalIgnoreCase);
            var variableSnapshot = variables
                .GroupBy(item => item.VariableCode, StringComparer.OrdinalIgnoreCase)
                .ToDictionary(
                    group => group.Key,
                    group =>
                    {
                        // 历史任务若意外存在重复变量，以排序后的最后一条最终值为准，避免建档时报 500。
                        var item = group.Last();
                        return (object)new
                        {
                            variableName = item.VariableName,
                            variableType = item.VariableType,
                            dataType = item.DataType,
                            variableValue = item.VariableValue,
                            sourceType = item.SourceType,
                            isManualOverride = item.IsManualOverride,
                            sortCode = item.SortCode
                        };
                    },
                    StringComparer.OrdinalIgnoreCase);

            snapshots.Add(new ObEmployeeContractSnapshot
            {
                Id = global::SimpleAdmin.Core.Utils.CommonUtils.GetSingleId(),
                EmployeeId = employeeId,
                TaskId = taskId,
                TaskContractId = contract.Id,
                TemplateId = contract.TemplateId,
                TemplateVersionId = contract.TemplateVersionId,
                ContractName = contract.ContractName,
                ContractType = contract.ContractType,
                ContractStartDate = ParseDate(GetValue(valueMap, "hr.ContractStartDate")),
                ContractEndDate = ParseDate(GetValue(valueMap, "hr.ContractEndDate")),
                ContractTerm = GetValue(valueMap, "hr.ContractTerm"),
                ProbationStartDate = ParseDate(GetValue(valueMap, "hr.ProbationStartDate")),
                ProbationEndDate = ParseDate(GetValue(valueMap, "hr.ProbationEndDate")),
                ProbationTerm = GetValue(valueMap, "hr.ProbationTerm"),
                ProbationSalary = ParseAmount(GetValue(valueMap, "hr.ProbationSalary")),
                BaseSalary = ParseAmount(GetValue(valueMap, "hr.BaseSalary")),
                PositionSalary = ParseAmount(GetValue(valueMap, "hr.PositionSalary")),
                PerformanceAllowance = ParseAmount(GetValue(valueMap, "hr.PerformanceAllowance")),
                AttendanceBonus = ParseAmount(GetValue(valueMap, "hr.AttendanceBonus")),
                RegularSalary = ParseAmount(GetValue(valueMap, "hr.RegularSalary")),
                WorkCity = GetValue(valueMap, "hr.WorkCity"),
                PositionName = GetValue(valueMap, "hr.PositionName"),
                EmployeeNo = GetValue(valueMap, "hr.EmployeeNo"),
                VariablesJson = global::System.Text.Json.JsonSerializer.Serialize(variableSnapshot),
                SnapshotVersion = 1,
                SnapshotAt = now,
                Status = CommonStatusConst.ENABLE,
                CreateTime = now,
                CreateUserId = UserManager.UserId,
                CreateUser = UserManager.Name,
                IsDelete = false
            });
        }

        // Build 只在审核建档事务内执行；先删后建使异常重试保持幂等。
        await _db.Deleteable<ObEmployeeContractSnapshot>()
            .Where(item => item.TaskId == taskId)
            .ExecuteCommandAsync();
        await _db.Insertable(snapshots).ExecuteCommandAsync();
    }

    private static string GetValue(
        IReadOnlyDictionary<string, string> valueMap,
        string variableCode)
    {
        return valueMap.TryGetValue(variableCode, out var value) && !string.IsNullOrWhiteSpace(value)
            ? value.Trim()
            : null;
    }

    private static DateTime? ParseDate(string value)
    {
        return DateTime.TryParse(value, out var date) ? date.Date : null;
    }

    private static decimal? ParseAmount(string value)
    {
        if (string.IsNullOrWhiteSpace(value))
            return null;

        var normalized = value
            .Replace("￥", string.Empty)
            .Replace("¥", string.Empty)
            .Replace("元", string.Empty)
            .Trim();
        if (decimal.TryParse(
                normalized,
                NumberStyles.Number | NumberStyles.AllowCurrencySymbol,
                CultureInfo.GetCultureInfo("zh-CN"),
                out var amount)
            || decimal.TryParse(
                normalized,
                NumberStyles.Number,
                CultureInfo.InvariantCulture,
                out amount))
        {
            return amount;
        }

        return null;
    }
}