{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Symfony Parameters and Services Configuration",
  "description": "Defines application parameters and services, including imports and environment-specific conditionals.",
  "$comment": "Root allows extension namespaces (framework:, doctrine:, etc.) via additionalProperties: true.",
  "type": "object",
  "properties": {
    "imports": {
      "type": "array",
      "description": "Import other configuration resources.",
      "$comment": "YAML examples:\n- { resource: 'services.yaml' }\n- { resource: packages/dev/services.yaml, ignore_errors: true }\n- 'other_file.yaml'",
      "items": {
        "oneOf": [
          { "type": "string" },
          {
            "type": "object",
            "properties": {
              "resource": { "type": "string" },
              "type": { "type": ["string", "null"] },
              "ignore_errors": { "type": "boolean" }
            },
            "required": ["resource"],
            "additionalProperties": false
          }
        ]
      }
    },
    "parameters": {
      "type": "object",
      "description": "Defines application-wide parameters.",
      "$comment": "Values support scalars, arrays and objects.",
      "patternProperties": {
        "^.+$": { "$ref": "#/$defs/parameterValue" }
      },
      "additionalProperties": false
    },
    "services": {
      "type": "object",
      "description": "Defines your application services.",
      "$comment": "Service ids accept multiple shapes: object (full definition), '@alias' string (alias), null (empty definition), prototype (resource/namespace), stack, and short array syntax for arguments.",
      "properties": {
        "_defaults": {
          "$ref": "#/$defs/serviceDefaults"
        },
        "_instanceof": {
          "type": "object",
          "patternProperties": {
            "^.+$": { "$ref": "#/$defs/serviceInstanceof" }
          },
          "additionalProperties": false
        }
      },
      "patternProperties": {
        "^(?:[A-Za-z_\\x7f-\\xff][A-Za-z0-9_\\x7f-\\xff]*\\\\)+[A-Za-z_\\x7f-\\xff][A-Za-z0-9_\\x7f-\\xff]*$": {
          "oneOf": [
            { "$ref": "#/$defs/serviceConcrete" },
            { "$ref": "#/$defs/serviceAliasObject" },
            { "$ref": "#/$defs/servicePrototype" },
            { "$ref": "#/$defs/serviceStack" },
            { "$ref": "#/$defs/serviceShortSyntax" },
            { "type": "null" },
            { "type": "string", "pattern": "^@.+" }
          ],
          "$comment": "FQCN service ids: short array syntax is allowed here."
        },
        "^(?!_).+$": {
          "oneOf": [
            { "$ref": "#/$defs/serviceConcrete" },
            { "$ref": "#/$defs/serviceAliasObject" },
            { "$ref": "#/$defs/servicePrototype" },
            { "$ref": "#/$defs/serviceStack" },
            { "type": "null" },
            { "type": "string", "pattern": "^@.+" }
          ],
          "$comment": "Non-FQCN ids: short array syntax is not allowed."
        }
      },
      "additionalProperties": false
    }
  },
  "patternProperties": {
    "^when@.+$": {
      "$ref": "#",
      "description": "A container for parameters and services that are only loaded in a specific environment."
    }
  },
  "additionalProperties": true,
  "$defs": {
    "parameterValue": {
      "oneOf": [
        { "type": "string" },
        { "type": "number" },
        { "type": "boolean" },
        { "type": "array" },
        { "type": "object" },
        { "type": "null" }
      ]
    },
    "scalarValue": {
      "oneOf": [
        { "type": "string" },
        { "type": "number" },
        { "type": "boolean" },
        { "type": "null" }
      ]
    },
    "fqcn": {
      "type": "string",
      "pattern": "^(?:\\\\)?(?:[A-Za-z_\\\\x7f-\\\\xff][A-Za-z0-9_\\\\x7f-\\\\xff]*\\\\)+[A-Za-z_\\\\x7f-\\\\xff][A-Za-z0-9_\\\\x7f-\\\\xff]*$",
      "$comment": "Fully-qualified class name, optional leading backslash; requires at least one namespace separator."
    },
    "arguments": {
      "$comment": "Arguments can be an array (positional) or a map (named).",
      "oneOf": [
        { "type": "array", "items": { "$ref": "#/$defs/parameterValue" } },
        { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } }
      ]
    },
    "tags": {
      "$comment": "YAML examples:\n- ['kernel.event_subscriber', { name: 'kernel.event_listener', event: 'kernel.request' }, { my_tag: { attr: 1 } }].",
      "type": "array",
      "items": {
        "oneOf": [
          { "type": "string" },
          {
            "type": "object",
            "properties": { "name": { "type": "string" } },
            "required": ["name"],
            "additionalProperties": true
          },
          {
            "type": "object",
            "minProperties": 1,
            "maxProperties": 1,
            "additionalProperties": {
              "type": "object",
              "additionalProperties": { "$ref": "#/$defs/parameterValue" }
            }
          }
        ]
      }
    },
    "calls": {
      "$comment": "YAML examples:\n- ['setFoo', ['@bar'], true]\n- { method: 'setFoo', arguments: ['@bar'], returns_clone: true }\n- { setFoo: ['@bar'] }\n- { setFoo: !returns_clone ['@bar'] } (special YAML tag)",
      "type": "array",
      "items": {
        "oneOf": [
          {
            "type": "array",
            "minItems": 1,
            "maxItems": 3,
            "items": [
              { "type": "string" },
              {
                "oneOf": [
                  { "type": "array", "items": { "$ref": "#/$defs/parameterValue" } },
                  { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } }
                ]
              },
              { "type": "boolean" }
            ]
          },
          {
            "type": "object",
            "properties": {
              "method": { "type": "string" },
              "arguments": { "$ref": "#/$defs/arguments" },
              "returns_clone": { "type": "boolean" }
            },
            "required": ["method"],
            "additionalProperties": false
          },
          {
            "type": "object",
            "minProperties": 1,
            "maxProperties": 1,
            "additionalProperties": { "$ref": "#/$defs/arguments" }
          }
        ]
      }
    },
    "deprecation": {
      "$comment": "YamlFileLoader requires an object with 'package' and 'version'.",
      "type": "object",
      "properties": {
        "package": { "type": "string" },
        "version": { "type": "string" },
        "message": { "type": "string" }
      },
      "required": ["package", "version"],
      "additionalProperties": false
    },
    "callable": {
      "$comment": "Either 'Class::method' or ['Class', 'method'].",
      "oneOf": [
        { "type": "string" },
        {
          "type": "array",
          "minItems": 2,
          "maxItems": 2,
          "items": [ { "type": "string" }, { "type": "string" } ]
        }
      ]
    },
    "serviceShortSyntax": {
      "$comment": "Short syntax: service defined as arguments array. YAML example: App\\SomeService: ['@dependency', 'literal', 123]",
      "type": "array",
      "items": { "$ref": "#/$defs/parameterValue" }
    },
    "factoryCallable": {
      "$comment": "Either '@service', 'Class::method', or [classOrService, method]. For ['null', method] the class is resolved from the service class when using 'constructor'.",
      "oneOf": [
        { "type": "string" },
        {
          "type": "array",
          "minItems": 2,
          "maxItems": 2,
          "items": [ { "type": ["string", "null"] }, { "type": "string" } ]
        }
      ]
    },
    "serviceAliasObject": {
      "$comment": "Allowed keys for aliases are only 'alias', 'public', 'deprecated'.",
      "type": "object",
      "properties": {
        "alias": { "type": "string" },
        "public": { "type": "boolean" },
        "deprecated": { "$ref": "#/$defs/deprecation" }
      },
      "required": ["alias"],
      "additionalProperties": false
    },
    "serviceConcrete": {
      "$comment": "'constructor' cannot be used together with 'factory'. If 'from_callable' is used, many other keys are not allowed (see YamlFileLoader).",
      "type": "object",
      "properties": {
        "class": { "type": "string" },
        "file": { "type": "string" },
        "parent": { "type": "string" },
        "shared": { "type": "boolean" },
        "synthetic": { "type": "boolean" },
        "lazy": { "oneOf": [ { "type": "boolean" }, { "$ref": "#/$defs/fqcn" } ] },
        "public": { "type": "boolean" },
        "abstract": { "type": "boolean" },
        "deprecated": { "$ref": "#/$defs/deprecation" },
        "factory": { "$ref": "#/$defs/factoryCallable" },
        "configurator": { "$ref": "#/$defs/callable" },
        "arguments": { "$ref": "#/$defs/arguments" },
        "properties": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "calls": { "$ref": "#/$defs/calls" },
        "tags": { "$ref": "#/$defs/tags" },
        "resource_tags": { "$ref": "#/$defs/tags" },
        "decorates": { "type": "string" },
        "decoration_inner_name": { "type": "string" },
        "decoration_priority": { "type": "integer" },
        "decoration_on_invalid": { "oneOf": [ { "enum": ["exception", "ignore"] }, { "type": "null" } ], "$comment": "Use null (without quotes) for NULL_ON_INVALID_REFERENCE." },
        "autowire": { "type": "boolean" },
        "autoconfigure": { "type": "boolean" },
        "bind": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "constructor": { "type": "string" },
        "from_callable": { "$ref": "#/$defs/parameterValue", "$comment": "Will be wrapped by factory ['Closure','fromCallable'] and sets lazy=true unless class is 'Closure'." }
      },
      "additionalProperties": false
    },
    "servicePrototype": {
      "$comment": "Prototype definitions register classes by scanning directories. 'namespace' requires 'resource'.",
      "type": "object",
      "properties": {
        "resource": { "type": "string" },
        "namespace": { "type": "string" },
        "exclude": {
          "oneOf": [
            { "type": "string" },
            { "type": "array", "items": { "type": "string" } }
          ]
        },
        "parent": { "type": "string" },
        "shared": { "type": "boolean" },
        "lazy": { "oneOf": [ { "type": "boolean" }, { "$ref": "#/$defs/fqcn" } ] },
        "public": { "type": "boolean" },
        "abstract": { "type": "boolean" },
        "deprecated": { "$ref": "#/$defs/deprecation" },
        "factory": { "$ref": "#/$defs/factoryCallable" },
        "arguments": { "$ref": "#/$defs/arguments" },
        "properties": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "configurator": { "$ref": "#/$defs/callable" },
        "calls": { "$ref": "#/$defs/calls" },
        "tags": { "$ref": "#/$defs/tags" },
        "resource_tags": { "$ref": "#/$defs/tags" },
        "autowire": { "type": "boolean" },
        "autoconfigure": { "type": "boolean" },
        "bind": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "constructor": { "type": "string" }
      },
      "required": ["resource"],
      "allOf": [
        { "anyOf": [ { "not": { "required": ["namespace"] } }, { "required": ["resource"] } ] }
      ],
      "additionalProperties": false
    },
    "serviceStack": {
      "$comment": "A stack builds a service pipeline from multiple frames.",
      "type": "object",
      "properties": {
        "stack": {
          "type": "array",
          "items": {
            "oneOf": [
              { "$ref": "#/$defs/serviceConcrete" },
              { "$ref": "#/$defs/serviceAliasObject" },
              { "$ref": "#/$defs/servicePrototype" }
            ]
          }
        },
        "public": { "type": "boolean" },
        "deprecated": { "$ref": "#/$defs/deprecation" }
      },
      "required": ["stack"],
      "additionalProperties": false
    },
    "serviceDefaults": {
      "$comment": "Defaults applied to services declared in the current file.",
      "type": "object",
      "properties": {
        "public": { "type": "boolean" },
        "tags": { "$ref": "#/$defs/tags" },
        "resource_tags": { "$ref": "#/$defs/tags" },
        "autowire": { "type": "boolean" },
        "autoconfigure": { "type": "boolean" },
        "bind": {
          "type": "object",
          "additionalProperties": { "$ref": "#/$defs/parameterValue" }
        }
      },
      "additionalProperties": false
    },
    "serviceInstanceof": {
      "$comment": "Applied to services declared in the current file whose class matches the key (interface or parent class).",
      "type": "object",
      "properties": {
        "shared": { "type": "boolean" },
        "lazy": { "oneOf": [ { "type": "boolean" }, { "$ref": "#/$defs/fqcn" } ] },
        "public": { "type": "boolean" },
        "properties": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "configurator": { "$ref": "#/$defs/callable" },
        "calls": { "$ref": "#/$defs/calls" },
        "tags": { "$ref": "#/$defs/tags" },
        "resource_tags": { "$ref": "#/$defs/tags" },
        "autowire": { "type": "boolean" },
        "bind": { "type": "object", "additionalProperties": { "$ref": "#/$defs/parameterValue" } },
        "constructor": { "type": "string" }
      },
      "additionalProperties": false
    }
  }
}