# lib/core.ps1 - state.json, presets, and which preset a mode resolves to.
#
# Part of claude-mode.ps1, which dot-sources it into its own script scope after
# the settings at its top. Not meant to run on its own. ASCII only: Windows
# PowerShell 5.1 reads a .ps1 without a BOM as ANSI. $PSScriptRoot here would be
# lib\, so paths beside the main script go through $script:Here.

# ---------------------------------------------------------------------------
# State / presets
# ---------------------------------------------------------------------------

function Initialize-Root {
    foreach ($d in @($script:Root, $script:PresetDir, $script:VaultDir, $script:BackupDir, $script:BinDir)) {
        if (-not (Test-Path -LiteralPath $d)) { New-Item -ItemType Directory -Path $d -Force | Out-Null }
    }
}

function Get-State {
    $s = Read-JsonFile $script:StatePath
    if ($null -eq $s) { $s = [ordered]@{} }
    if (-not $s.Contains('mode'))           { $s['mode']   = 'anthropic' }
    if (-not $s.Contains('preset'))         { $s['preset'] = '' }
    if (-not $s.Contains('writtenEnvKeys')) { $s['writtenEnvKeys'] = @() }
    return $s
}

function Set-State {
    param([string] $Mode, [string] $PresetName, [string[]] $WrittenKeys)
    $s = Get-State
    $s['mode']           = $Mode
    $s['preset']         = $PresetName
    $s['writtenEnvKeys'] = @($WrittenKeys)
    $s['updated']        = (Get-Date).ToString('o')
    # Written by older builds that picked "most recently used" presets; the
    # per-provider default is fixed now, so nothing maintains this.
    if ($s.Contains('lastByProvider')) { $s.Remove('lastByProvider') }
    Write-JsonFile $script:StatePath $s
}

function Get-PresetPath { param([string] $Name) return (Join-Path $script:PresetDir "$Name.json") }

function Get-Preset {
    param([string] $Name)
    $p = Read-JsonFile (Get-PresetPath $Name)
    if ($null -eq $p) { throw "preset '$Name' not found. Run: claude-mode presets" }
    if (-not $p.Contains('provider')) { $p['provider'] = 'openrouter' }
    return $p
}

function Get-PresetNames {
    if (-not (Test-Path -LiteralPath $script:PresetDir)) { return @() }
    return @(Get-ChildItem -LiteralPath $script:PresetDir -Filter '*.json' |
        ForEach-Object { $_.BaseName } | Sort-Object)
}

function Get-PresetNamesForProvider {
    param([string] $Provider)
    $out = @()
    foreach ($n in Get-PresetNames) {
        try { if ([string](Get-Preset $n)['provider'] -eq $Provider) { $out += $n } } catch { }
    }
    return $out
}

function Resolve-PresetForProvider {
    param([string] $Provider, [string] $Requested)

    if ($Requested) {
        $p = Get-Preset $Requested
        if ([string]$p['provider'] -ne $Provider) {
            throw "preset '$Requested' is a '$($p['provider'])' preset, not '$Provider'"
        }
        return $Requested
    }

    # Fixed per-provider default, so `claude-mode openrouter` is predictable
    # rather than depending on what you last used or on alphabetical order.
    $fallback = $script:ProviderDefaultPreset[$Provider]
    if ($fallback -and (Test-Path -LiteralPath (Get-PresetPath $fallback))) {
        if ([string](Get-Preset $fallback)['provider'] -eq $Provider) { return $fallback }
    }

    $names = Get-PresetNamesForProvider $Provider
    if ($names.Count -gt 0) { return $names[0] }
    throw "no preset found for provider '$Provider'"
}