{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://cityresourcegraph.com/schemas/economic_calculation.json",
  "title": "Economic Calculation Request/Response",
  "description": "Schema for economic viability calculations",
  "type": "object",
  "properties": {
    "match_id": {
      "type": "string",
      "format": "uuid",
      "description": "Match identifier"
    },
    "source_resource": {
      "$ref": "https://cityresourcegraph.com/schemas/resource_flow.json"
    },
    "target_resource": {
      "$ref": "https://cityresourcegraph.com/schemas/resource_flow.json"
    },
    "calculations": {
      "type": "object",
      "properties": {
        "annual_savings": {
          "type": "number",
          "description": "Annual cost savings (€)"
        },
        "payback_period_years": {
          "type": "number",
          "minimum": 0,
          "description": "Investment payback period"
        },
        "npv_10_years": {
          "type": "number",
          "description": "Net present value over 10 years (€)"
        },
        "irr_percent": {
          "type": "number",
          "minimum": 0,
          "description": "Internal rate of return (%)"
        },
        "transportation_costs": {
          "type": "object",
          "properties": {
            "annual_cost": {"type": "number"},
            "distance_km": {"type": "number"},
            "method": {"type": "string"}
          }
        },
        "co2_reduction_tonnes": {
          "type": "number",
          "minimum": 0,
          "description": "Annual CO2 emissions reduction"
        },
        "implementation_complexity": {
          "type": "string",
          "enum": ["low", "medium", "high"],
          "description": "Technical implementation complexity"
        },
        "regulatory_requirements": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Required permits and approvals"
        }
      },
      "required": ["annual_savings", "payback_period_years"]
    },
    "assumptions": {
      "type": "object",
      "properties": {
        "discount_rate": {
          "type": "number",
          "default": 0.08,
          "description": "Discount rate for NPV calculations"
        },
        "operating_hours_year": {
          "type": "integer",
          "default": 8000,
          "description": "Annual operating hours"
        },
        "maintenance_cost_factor": {
          "type": "number",
          "default": 0.05,
          "description": "Annual maintenance as % of capital cost"
        },
        "energy_cost_inflation": {
          "type": "number",
          "default": 0.02,
          "description": "Annual energy cost inflation rate"
        }
      }
    }
  },
  "required": ["source_resource", "target_resource"],
  "additionalProperties": false
}