# Config.ps1 — config.json and state.json read/write helpers
# Requires $InternalRoot to be defined in the calling script's scope before dot-sourcing.

function Get-ConfigPath { Join-Path $InternalRoot 'data\config.json' }
function Get-StatePath  { Join-Path $InternalRoot 'data\state\state.json' }

# ── Config ────────────────────────────────────────────────────────────────────

function Get-Config {
    $path = Get-ConfigPath
    if (-not (Test-Path $path)) {
        return @{ features = @{} }
    }
    try {
        $raw = Get-Content -Path $path -Raw -Encoding UTF8 -ErrorAction Stop
        return ConvertTo-DeepHashtable ($raw | ConvertFrom-Json)
    }
    catch {
        Write-Log -Level Error -Message "Failed to read config.json, returning empty defaults: $_" -Feature 'Config'
        return @{ features = @{} }
    }
}

function Save-Config {
    param([hashtable]$Config)

    $path = Get-ConfigPath
    $dir  = Split-Path $path -Parent
    if (-not (Test-Path $dir)) {
        New-Item -ItemType Directory -Path $dir -Force | Out-Null
    }
    try {
        $Config | ConvertTo-Json -Depth 10 | Set-Content -Path $path -Encoding UTF8 -ErrorAction Stop
    }
    catch {
        Write-Log -Level Error -Message "Failed to save config.json: $_" -Feature 'Config'
    }
}

# ── State ─────────────────────────────────────────────────────────────────────

function Get-State {
    $path = Get-StatePath
    if (-not (Test-Path $path)) {
        return @{}
    }
    try {
        $raw = Get-Content -Path $path -Raw -Encoding UTF8 -ErrorAction Stop
        return ConvertTo-DeepHashtable ($raw | ConvertFrom-Json)
    }
    catch {
        Write-Log -Level Error -Message "Failed to read state.json, returning empty state: $_" -Feature 'Config'
        return @{}
    }
}

function Save-State {
    param([hashtable]$State)

    $path = Get-StatePath
    $dir  = Split-Path $path -Parent
    if (-not (Test-Path $dir)) {
        New-Item -ItemType Directory -Path $dir -Force | Out-Null
    }
    try {
        $State | ConvertTo-Json -Depth 10 | Set-Content -Path $path -Encoding UTF8 -ErrorAction Stop
    }
    catch {
        Write-Log -Level Error -Message "Failed to save state.json: $_" -Feature 'Config'
    }
}

# ── Feature config seeding ────────────────────────────────────────────────────

function Ensure-FeatureConfig {
    <#
    .SYNOPSIS
        Ensures config.json contains an entry for the given feature, with all
        settings keys present. Missing keys are filled from $FeatureMeta.Settings[*].Default.
        Returns the (potentially modified) config hashtable.
    #>
    param(
        [hashtable]$Config,
        [hashtable]$FeatureMeta
    )

    $name = $FeatureMeta.Name

    if (-not $Config.features.ContainsKey($name)) {
        $Config.features[$name] = @{ enabled = $false }
    }

    foreach ($setting in $FeatureMeta.Settings) {
        if (-not $Config.features[$name].ContainsKey($setting.Key)) {
            $Config.features[$name][$setting.Key] = $setting.Default
        }
    }

    return $Config
}

# ── Internal helper ───────────────────────────────────────────────────────────

function ConvertTo-DeepHashtable {
    <#
    .SYNOPSIS
        Recursively converts PSCustomObject (from ConvertFrom-Json) into hashtables
        so all config/state values are mutable and support .ContainsKey().
    #>
    param([object]$InputObject)

    if ($null -eq $InputObject)                                               { return $null }
    if ($InputObject -is [hashtable])                                         { return $InputObject }
    if ($InputObject -is [System.Collections.IEnumerable] -and
        $InputObject -isnot [string]) {
        return @($InputObject | ForEach-Object { ConvertTo-DeepHashtable $_ })
    }
    if ($InputObject -is [PSCustomObject]) {
        $hash = @{}
        foreach ($prop in $InputObject.PSObject.Properties) {
            $hash[$prop.Name] = ConvertTo-DeepHashtable $prop.Value
        }
        return $hash
    }
    return $InputObject
}