{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Issue Execution Queue Schema",
  "description": "Execution queue supporting both task-level (T-N) and solution-level (S-N) granularity",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^QUE-[0-9]{8}-[0-9]{6}$",
      "description": "Queue ID in format QUE-YYYYMMDD-HHMMSS"
    },
    "status": {
      "type": "string",
      "enum": ["active", "paused", "completed", "archived"],
      "default": "active"
    },
    "issue_ids": {
      "type": "array",
      "items": { "type": "string" },
      "description": "Issues included in this queue"
    },
    "solutions": {
      "type": "array",
      "description": "Solution-level queue items (preferred for new queues)",
      "items": {
        "$ref": "#/definitions/solutionItem"
      }
    },
    "tasks": {
      "type": "array",
      "description": "Task-level queue items (legacy format)",
      "items": {
        "$ref": "#/definitions/taskItem"
      }
    },
    "conflicts": {
      "type": "array",
      "description": "Detected conflicts between items",
      "items": {
        "$ref": "#/definitions/conflict"
      }
    },
    "execution_groups": {
      "type": "array",
      "description": "Parallel/Sequential execution groups",
      "items": {
        "$ref": "#/definitions/executionGroup"
      }
    },
    "_metadata": {
      "type": "object",
      "properties": {
        "version": { "type": "string", "default": "2.0" },
        "queue_type": {
          "type": "string",
          "enum": ["solution", "task"],
          "description": "Queue granularity level"
        },
        "total_solutions": { "type": "integer" },
        "total_tasks": { "type": "integer" },
        "pending_count": { "type": "integer" },
        "ready_count": { "type": "integer" },
        "executing_count": { "type": "integer" },
        "completed_count": { "type": "integer" },
        "failed_count": { "type": "integer" },
        "last_queue_formation": { "type": "string", "format": "date-time" },
        "last_updated": { "type": "string", "format": "date-time" }
      }
    }
  },
  "definitions": {
    "solutionItem": {
      "type": "object",
      "required": ["item_id", "issue_id", "solution_id", "status", "task_count", "files_touched"],
      "properties": {
        "item_id": {
          "type": "string",
          "pattern": "^S-[0-9]+$",
          "description": "Solution-level queue item ID (S-1, S-2, ...)"
        },
        "issue_id": {
          "type": "string",
          "description": "Source issue ID"
        },
        "solution_id": {
          "type": "string",
          "description": "Bound solution ID"
        },
        "status": {
          "type": "string",
          "enum": ["pending", "ready", "executing", "completed", "failed", "blocked"],
          "default": "pending"
        },
        "task_count": {
          "type": "integer",
          "minimum": 1,
          "description": "Number of tasks in this solution"
        },
        "files_touched": {
          "type": "array",
          "items": { "type": "string" },
          "description": "All files modified by this solution"
        },
        "execution_order": {
          "type": "integer",
          "description": "Order in execution sequence"
        },
        "execution_group": {
          "type": "string",
          "description": "Parallel (P*) or Sequential (S*) group ID"
        },
        "depends_on": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Solution IDs this item depends on"
        },
        "semantic_priority": {
          "type": "number",
          "minimum": 0,
          "maximum": 1,
          "description": "Semantic importance score (0.0-1.0)"
        },
        "queued_at": { "type": "string", "format": "date-time" },
        "started_at": { "type": "string", "format": "date-time" },
        "completed_at": { "type": "string", "format": "date-time" },
        "result": {
          "type": "object",
          "properties": {
            "summary": { "type": "string" },
            "files_modified": { "type": "array", "items": { "type": "string" } },
            "tasks_completed": { "type": "integer" },
            "commit_hashes": { "type": "array", "items": { "type": "string" } }
          }
        },
        "failure_reason": { "type": "string" }
      }
    },
    "taskItem": {
      "type": "object",
      "required": ["item_id", "issue_id", "solution_id", "task_id", "status"],
      "properties": {
        "item_id": {
          "type": "string",
          "pattern": "^T-[0-9]+$",
          "description": "Task-level queue item ID (T-1, T-2, ...)"
        },
        "issue_id": { "type": "string" },
        "solution_id": { "type": "string" },
        "task_id": { "type": "string" },
        "status": {
          "type": "string",
          "enum": ["pending", "ready", "executing", "completed", "failed", "blocked"],
          "default": "pending"
        },
        "execution_order": { "type": "integer" },
        "execution_group": { "type": "string" },
        "depends_on": { "type": "array", "items": { "type": "string" } },
        "semantic_priority": { "type": "number", "minimum": 0, "maximum": 1 },
        "queued_at": { "type": "string", "format": "date-time" },
        "started_at": { "type": "string", "format": "date-time" },
        "completed_at": { "type": "string", "format": "date-time" },
        "result": {
          "type": "object",
          "properties": {
            "files_modified": { "type": "array", "items": { "type": "string" } },
            "files_created": { "type": "array", "items": { "type": "string" } },
            "summary": { "type": "string" },
            "commit_hash": { "type": "string" }
          }
        },
        "failure_reason": { "type": "string" }
      }
    },
    "conflict": {
      "type": "object",
      "properties": {
        "type": {
          "type": "string",
          "enum": ["file_conflict", "dependency_conflict", "resource_conflict"]
        },
        "file": {
          "type": "string",
          "description": "Conflicting file path"
        },
        "solutions": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Solution IDs involved (for solution-level queues)"
        },
        "tasks": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Task IDs involved (for task-level queues)"
        },
        "resolution": {
          "type": "string",
          "enum": ["sequential", "merge", "manual"]
        },
        "resolution_order": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Execution order to resolve conflict"
        },
        "rationale": {
          "type": "string",
          "description": "Explanation of resolution decision"
        },
        "resolved": {
          "type": "boolean",
          "default": false
        }
      }
    },
    "executionGroup": {
      "type": "object",
      "required": ["id", "type"],
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^[PS][0-9]+$",
          "description": "Group ID (P1, P2 for parallel, S1, S2 for sequential)"
        },
        "type": {
          "type": "string",
          "enum": ["parallel", "sequential"]
        },
        "solutions": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Solution IDs in this group"
        },
        "tasks": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Task IDs in this group (legacy)"
        },
        "solution_count": {
          "type": "integer",
          "description": "Number of solutions in group"
        },
        "task_count": {
          "type": "integer",
          "description": "Number of tasks in group (legacy)"
        }
      }
    }
  }
}