param(
    [switch]$DryRun,
    [Alias('Host')][string]$TargetHost = '127.0.0.1',
    [int]$Port = 3306,
    [string]$InputPath,
    [string]$MysqlExe = 'C:\Program Files\MySQL\MySQL Server 8.4\bin\mysql.exe',
    [string]$User = 'root'
)

$ErrorActionPreference = 'Stop'
$Repo = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
$Workspace = (Resolve-Path (Join-Path $Repo '..')).Path
$Acceptance = Join-Path $Workspace '.codex-tmp\p23-04-acceptance'
$ExpectedSha256 = '3E0A02C2E3B971AB7D8AB9C9D8AEE1D933F950DBCE82BD9B6AD431A4DD179F8A'
$ExpectedLines = 14713

if ($TargetHost -notin @('127.0.0.1', 'localhost')) {
    [Console]::Error.WriteLine('Refusing non-local database; only 127.0.0.1 or localhost is allowed.')
    exit 2
}
if ([string]::IsNullOrWhiteSpace($InputPath)) {
    $InputPath = (Get-ChildItem (Join-Path $Repo 'deploy\sql') -Filter '*MySQL8.sql' -File |
        Where-Object { $_.Length -gt 100000 } | Select-Object -First 1).FullName
}
if (-not (Test-Path -LiteralPath $InputPath)) {
    [Console]::Error.WriteLine("InputPath does not exist: $InputPath")
    exit 2
}
$actual = ((Get-FileHash -Algorithm SHA256 -LiteralPath $InputPath).Hash).Trim().ToUpperInvariant()
$lines = [System.IO.File]::ReadAllLines($InputPath).Length
if ($actual -ne $ExpectedSha256 -or $lines -ne $ExpectedLines) {
    [Console]::Error.WriteLine("Unified SQL snapshot mismatch: $actual/$lines")
    exit 2
}
$sqlText = [System.IO.File]::ReadAllText($InputPath)
$commentGateTokens = @(
    'CREATE PROCEDURE queue_column_comment',
    'CREATE PROCEDURE apply_one_table_comments',
    'CALL apply_queued_comments();',
    '字段注释批量升级改变了结构签名',
    '存在缺失中文注释的业务表',
    '存在缺失中文注释的业务字段'
)
foreach ($token in $commentGateTokens) {
    if (-not $sqlText.Contains($token)) {
        [Console]::Error.WriteLine("Unified SQL comment acceptance marker missing: $token")
        exit 2
    }
}
if ([regex]::Matches($sqlText, "SELECT 'PASS' AS migration_status").Count -ne 1) {
    [Console]::Error.WriteLine('Unified SQL must contain exactly one final PASS statement')
    exit 2
}

$sequence = @(
    'empty: base.sql', 'replay: base.sql + input.sql + input.sql',
    'smart-old: fixture-smart-old.sql', 'inbound-old: fixture-inbound-old.sql',
    'waitsplit-iam: fixture-test-shape.sql', 'overseas-old: fixture-overseas-old.sql',
    'overseas-missing-objects: fixture-overseas-missing-objects.sql',
    'interrupted-recovery: fixture-interrupted.sql', 'final-structure: verify-final.sql')
Write-Output "SQL SHA-256: $actual / lines: $lines"
Write-Output 'Comment gate: queued validation, per-table ALTER, signature verification, nine-schema coverage, unique PASS'
Write-Output "Target: $TargetHost`:$Port"
Write-Output 'Fixture order:'
$sequence | ForEach-Object { Write-Output "  $_" }
if ($DryRun) { Write-Output 'DRY-RUN PASS (mysql not started; no database writes)'; exit 0 }

$acceptanceInput = Join-Path $Acceptance 'input.sql'
Copy-Item -LiteralPath $InputPath -Destination $acceptanceInput -Force
$stagedHash = ((Get-FileHash -Algorithm SHA256 -LiteralPath $acceptanceInput).Hash).Trim().ToUpperInvariant()
if ($stagedHash -ne $actual) {
    [Console]::Error.WriteLine("Failed to stage the validated unified SQL snapshot: $stagedHash")
    exit 2
}

$run = 0
function Invoke-Stage([string]$Name, [string]$File) {
    $script = Join-Path $Acceptance $File
    $log = Join-Path $Acceptance ("acceptance-run-{0:D2}-{1}.log" -f $script:run, $Name)
    $script:run++
    if (-not (Test-Path -LiteralPath $script)) { [Console]::Error.WriteLine("Script does not exist: $script"); return 2 }
    & $MysqlExe '--protocol=TCP' "--host=$TargetHost" "--port=$Port" "--user=$User" '--database=mysql' '--batch' ("--execute=source " + $script.Replace('\','/')) *> $log
    return $LASTEXITCODE
}

$calls = @(
    @('empty','base.sql'), @('replay-reset','base.sql'), @('replay-1','input.sql'), @('replay-2','input.sql'),
    @('smart-old','fixture-smart-old.sql'), @('inbound-old','fixture-inbound-old.sql'), @('waitsplit-iam','fixture-test-shape.sql'),
    @('overseas-old','fixture-overseas-old.sql'), @('overseas-missing','fixture-overseas-missing-objects.sql'),
    @('interrupted','fixture-interrupted.sql'), @('final-verify','verify-final.sql'))
foreach ($call in $calls) { $code = Invoke-Stage $call[0] $call[1]; if ($code -ne 0) { exit $code } }
Write-Output 'FULL LOCAL ACCEPTANCE PASS'
exit 0