# Modules\UserResolverService.ps1
# ==============================================================================
# User Multi-Input Resolver & Ambiguity (동명이인) Detection Service
# ==============================================================================

<#
.SYNOPSIS
    줄바꿈, 쉼표, 세미콜론, 탭(엑셀 복사본)으로 입력된 다중 사용자 텍스트를 파싱하고,
    Active Directory 및 DB에서 검색하여 [정상 매칭], [동명이인 중복], [미발견]으로 분류합니다.
#>

function Parse-MultiUserInput {
    param([string]$RawInput)

    if ([string]::IsNullOrWhiteSpace($RawInput)) {
        return ,@()
    }

    # 쉼표, 세미콜론, 줄바꿈, 탭, 공백 등 모든 구분자로 분리
    $tokens = $RawInput -split "[\r\n,;\t]+" | ForEach-Object { $_.Trim() } | Where-Object { $_ -ne "" }
    $uniqueTokens = @($tokens | Select-Object -Unique)
    return ,$uniqueTokens
}

function Resolve-UsersWithAmbiguityCheck {
    param(
        [string[]]$Tokens,
        [object]$Config = $null
    )

    # 기본 AD 사용자 풀 (Live 모드 시 실제 AD 검색 가능, 현재는 풍부한 샘플 풀 + 동명이인 포함)
    $allPool = @(
        [PSCustomObject]@{ SamAccountName = "gdhong"; DisplayName = "홍길동"; Department = "클라우드인프라팀"; Title = "수석"; Mail = "gdhong@corp.local"; EmpId = "EMP1001" },
        [PSCustomObject]@{ SamAccountName = "gdhong_sales"; DisplayName = "홍길동"; Department = "영업1팀"; Title = "과장"; Mail = "gdhong_sales@corp.local"; EmpId = "EMP1099" }, # 홍길동 동명이인!
        [PSCustomObject]@{ SamAccountName = "cskim"; DisplayName = "김철수"; Department = "데이터플랫폼팀"; Title = "책임 (DBA)"; Mail = "cskim@corp.local"; EmpId = "EMP1002" },
        [PSCustomObject]@{ SamAccountName = "cskim_dev"; DisplayName = "김철수"; Department = "프론트엔드개발팀"; Title = "선임"; Mail = "cskim_dev@corp.local"; EmpId = "EMP1088" }, # 김철수 동명이인!
        [PSCustomObject]@{ SamAccountName = "yylee"; DisplayName = "이영희"; Department = "보안관제팀"; Title = "책임"; Mail = "yylee@corp.local"; EmpId = "EMP1003" },
        [PSCustomObject]@{ SamAccountName = "mschoi"; DisplayName = "최민수"; Department = "개발운영팀"; Title = "선임"; Mail = "mschoi@corp.local"; EmpId = "EMP1004" },
        [PSCustomObject]@{ SamAccountName = "jhbak"; DisplayName = "박지훈"; Department = "시스템관리팀"; Title = "팀장"; Mail = "jhbak@corp.local"; EmpId = "EMP1005" },
        [PSCustomObject]@{ SamAccountName = "swjung"; DisplayName = "정수원"; Department = "인사기획팀"; Title = "차장"; Mail = "swjung@corp.local"; EmpId = "EMP1006" }
    )

    $pool = $allPool
    if ($Config -and $Config.ActiveDirectory -and [bool]$Config.ActiveDirectory.UseLive -and (Get-Command Get-ADUserList -ErrorAction SilentlyContinue)) {
        try {
            $liveUsers = Get-ADUserList -Config $Config
            if ($liveUsers -and $liveUsers.Count -gt 0) {
                $pool = $liveUsers
            }
        } catch {
            Write-Warning "Live AD 사용자 풀 조회 실패, 기본 풀을 사용합니다: $($_.Exception.Message)"
        }
    }

    $resolvedResults = [System.Collections.Generic.List[PSCustomObject]]::new()

    foreach ($rawToken in $Tokens) {
        if ([string]::IsNullOrWhiteSpace($rawToken)) {
            continue
        }
        $token = $rawToken.Trim()

        # 1. SamAccountName 정확 일치 우선 검색
        $matchById = @($pool | Where-Object { $_.SamAccountName -ieq $token })
        if ($matchById.Count -eq 1) {
            $u = $matchById[0]
            $resolvedResults.Add([PSCustomObject]@{
                InputToken     = $token
                Status         = "정상 매칭"
                StatusBadge    = "#10B981" # Green
                IsAmbiguous    = $false
                IsResolved     = $true
                IsSelected     = $true
                SamAccountName = $u.SamAccountName
                DisplayName    = $u.DisplayName
                Department     = $u.Department
                Title          = $u.Title
                EmpId          = $u.EmpId
                CandidateCount = 1
                Note           = "ID($token) 정확 일치"
            })
            continue
        }

        # 2. 이름(DisplayName) 일치 검색 (동명이인 판정 - 와일드카드 안전 처리)
        $matchByName = @($pool | Where-Object {
            $_.DisplayName -ieq $token -or
            ($_.DisplayName -and ($_.DisplayName.IndexOf($token, [System.StringComparison]::OrdinalIgnoreCase) -ge 0))
        })
        if ($matchByName.Count -eq 1) {
            $u = $matchByName[0]
            $resolvedResults.Add([PSCustomObject]@{
                InputToken     = $token
                Status         = "단일 매칭"
                StatusBadge    = "#10B981" # Green
                IsAmbiguous    = $false
                IsResolved     = $true
                IsSelected     = $true
                SamAccountName = $u.SamAccountName
                DisplayName    = $u.DisplayName
                Department     = $u.Department
                Title          = $u.Title
                EmpId          = $u.EmpId
                CandidateCount = 1
                Note           = "이름($token) 단일 사용자 확인"
            })
        }
        elseif ($matchByName.Count -gt 1) {
            # 동명이인 다수 발견! -> 각 후보자별로 개별 행 생성하여 운영자가 라디오/체크로 선택하도록 함
            foreach ($cand in $matchByName) {
                $resolvedResults.Add([PSCustomObject]@{
                    InputToken     = $token
                    Status         = "동명이인 확인필요"
                    StatusBadge    = "#F59E0B" # Amber / Warning
                    IsAmbiguous    = $true
                    IsResolved     = $false
                    IsSelected     = $false # 운영자 확인 전까지 미선택
                    SamAccountName = $cand.SamAccountName
                    DisplayName    = $cand.DisplayName
                    Department     = $cand.Department
                    Title          = $cand.Title
                    EmpId          = $cand.EmpId
                    CandidateCount = $matchByName.Count
                    Note           = "동명이인 $($matchByName.Count)명 중 1명 [부서: $($cand.Department) 확인필요]"
                })
            }
        }
        else {
            # 미발견
            $resolvedResults.Add([PSCustomObject]@{
                InputToken     = $token
                Status         = "미발견 (계정 없음)"
                StatusBadge    = "#EF4444" # Red
                IsAmbiguous    = $false
                IsResolved     = $false
                IsSelected     = $false
                SamAccountName = "-"
                DisplayName    = $token
                Department     = "-"
                Title          = "-"
                EmpId          = "-"
                CandidateCount = 0
                Note           = "AD 및 DB에서 해당 ID/이름을 찾을 수 없음"
            })
        }
    }

    return ,$resolvedResults.ToArray()
}