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using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Nodes;
using System.Threading.Tasks;
namespace AggregateConfigBuildTask.FileHandlers
{
/// <inheritdoc/>
public class ArmParametersFileHandler : IFileHandler
{
private readonly IFileSystem fileSystem;
private readonly JsonSerializerOptions jsonOptions = new JsonSerializerOptions { WriteIndented = true };
internal ArmParametersFileHandler(IFileSystem fileSystem)
{
this.fileSystem = fileSystem;
}
/// <inheritdoc/>
public async ValueTask<JsonElement> ReadInput(string inputPath)
{
using (var stream = fileSystem.OpenRead(inputPath))
using (var jsonDoc = await JsonDocument.ParseAsync(stream).ConfigureAwait(false))
{
if (jsonDoc.RootElement.TryGetProperty("parameters", out JsonElement parameters))
{
var modifiedParameters = new JsonObject();
foreach (var parameter in parameters.EnumerateObject())
{
if (parameter.Value.ValueKind == JsonValueKind.Object)
{
var paramObject = ConvertElementToNode(parameter.Value).AsObject();
// If the top-level object contains the "value" key, return the value
if (paramObject.ContainsKey("value"))
{
modifiedParameters[parameter.Name] = paramObject["value"]?.DeepClone();
}
}
}
var modifiedJson = modifiedParameters.ToJsonString();
return JsonSerializer.Deserialize<JsonElement>(modifiedJson);
}
return jsonDoc.RootElement.Clone();
}
}
/// <inheritdoc/>
public void WriteOutput(JsonElement? mergedData, string outputPath)
{
if (mergedData.HasValue && mergedData.Value.ValueKind == JsonValueKind.Object)
{
var parameters = new Dictionary<string, object>(StringComparer.Ordinal);
foreach (var kvp in mergedData.Value.EnumerateObject())
{
string type = GetParameterType(kvp.Value);
parameters[kvp.Name] = new Dictionary<string, object>(StringComparer.Ordinal)
{
["type"] = type,
["value"] = kvp.Value
};
}
// ARM template structure
var armTemplate = new Dictionary<string, object>(StringComparer.Ordinal)
{
["$schema"] = "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
["contentVersion"] = "1.0.0.0",
["parameters"] = parameters
};
var jsonContent = JsonSerializer.Serialize(armTemplate, jsonOptions);
fileSystem.WriteAllText(outputPath, jsonContent);
}
else
{
throw new InvalidOperationException("mergedData is either null or not a valid JSON object.");
}
}
/// <summary>
/// Determines the parameter type for a given JsonElement value, based on Azure ARM template supported types.
/// </summary>
/// <param name="value">The JsonElement value to evaluate.</param>
/// <returns>A string representing the ARM template parameter type.</returns>
/// <exception cref="ArgumentException">When a Json type cannot be mapped to an ARM template type</exception>
private static string GetParameterType(JsonElement value)
{
switch (value.ValueKind)
{
case JsonValueKind.String:
return "string";
case JsonValueKind.Number:
return "int";
case JsonValueKind.True:
case JsonValueKind.False:
return "bool";
case JsonValueKind.Array:
return "array";
case JsonValueKind.Object:
return "object";
default:
throw new ArgumentException("Unsupported type for ARM template parameters.", nameof(value));
}
}
private static JsonNode ConvertElementToNode(JsonElement element)
{
// Use GetRawText to get the JSON string representation of the JsonElement
var jsonString = element.GetRawText();
// Parse the string into a JsonNode
return JsonNode.Parse(jsonString);
}
}
}
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