{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://wpl.dev/schemas/wpl/v1.schema.json",
  "title": "WPL Wellness Plan",
  "description": "JSON Schema for compiled WPL (Wellness Plan Language) output.",
  "type": "object",
  "required": ["$schema", "version", "plan"],
  "additionalProperties": false,
  "properties": {
    "$schema": {
      "type": "string",
      "const": "https://wpl.dev/schemas/wpl/v1.schema.json"
    },
    "version": {
      "type": "string",
      "const": "1.0.0"
    },
    "plan": { "$ref": "#/$defs/Plan" }
  },

  "$defs": {
    "Plan": {
      "type": "object",
      "required": ["id", "name", "type", "visibility", "metadata", "goals", "phases"],
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^[a-z0-9][a-z0-9_-]*$",
          "description": "Slug or UUID identifier for the plan."
        },
        "name": { "type": "string", "minLength": 1 },
        "description": { "type": "string" },
        "type": { "$ref": "#/$defs/PlanType" },
        "visibility": { "$ref": "#/$defs/Visibility" },
        "metadata": { "$ref": "#/$defs/Metadata" },
        "goals": {
          "type": "array",
          "items": { "$ref": "#/$defs/Goal" }
        },
        "requirements": { "$ref": "#/$defs/Requirements" },
        "personalization": { "$ref": "#/$defs/Personalization" },
        "phases": {
          "type": "array",
          "items": { "$ref": "#/$defs/Phase" }
        },
        "progress": { "$ref": "#/$defs/Progress" },
        "notifications": {
          "type": "array",
          "items": { "$ref": "#/$defs/Notification" }
        }
      }
    },

    "PlanType": {
      "type": "string",
      "enum": ["workout", "nutrition", "meditation", "recovery", "hybrid"]
    },

    "Visibility": {
      "type": "string",
      "enum": ["private", "public", "template"]
    },

    "Difficulty": {
      "type": "string",
      "enum": ["beginner", "intermediate", "advanced", "adaptive"]
    },

    "TimeUnit": {
      "type": "string",
      "enum": ["seconds", "minutes", "hours", "days", "weeks"]
    },

    "Duration": {
      "type": "object",
      "required": ["value", "unit"],
      "additionalProperties": false,
      "properties": {
        "value": { "type": "number" },
        "unit": { "$ref": "#/$defs/TimeUnit" }
      }
    },

    "Metadata": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "created_at": { "type": "string", "format": "date-time" },
        "updated_at": { "type": "string", "format": "date-time" },
        "created_by": { "type": "string" },
        "tags": {
          "type": "array",
          "items": { "type": "string" }
        },
        "difficulty": { "$ref": "#/$defs/Difficulty" },
        "language": { "type": "string" },
        "estimated_duration_days": { "type": "integer", "minimum": 0 }
      }
    },

    "Goal": {
      "type": "object",
      "required": ["id", "type", "category"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": {
          "type": "string",
          "enum": ["primary", "secondary"]
        },
        "category": { "type": "string" },
        "name": { "type": "string" },
        "description": { "type": "string" },
        "target": { "$ref": "#/$defs/GoalTarget" },
        "deadline": { "type": "string" },
        "milestones": {
          "type": "array",
          "items": { "$ref": "#/$defs/Milestone" },
          "minItems": 1
        }
      }
    },

    "GoalTarget": {
      "type": "object",
      "required": ["metric", "target_value", "unit", "measurement_type"],
      "additionalProperties": false,
      "properties": {
        "metric": { "type": "string" },
        "target_value": { "type": "number" },
        "unit": { "type": "string" },
        "measurement_type": {
          "type": "string",
          "enum": ["absolute", "relative", "percentage"]
        }
      }
    },

    "Milestone": {
      "type": "object",
      "required": ["id", "name"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "name": { "type": "string" },
        "target_value": { "type": "number" },
        "reward_points": { "type": "number" }
      }
    },

    "Requirements": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "min_age": { "type": "integer", "minimum": 0 },
        "max_age": { "type": "integer", "minimum": 0 },
        "fitness_level": {
          "type": "array",
          "items": { "type": "string" }
        },
        "equipment": {
          "type": "array",
          "items": { "$ref": "#/$defs/Equipment" }
        },
        "contraindications": {
          "type": "array",
          "items": { "$ref": "#/$defs/Contraindication" }
        },
        "time_commitment": { "$ref": "#/$defs/TimeCommitment" }
      }
    },

    "Equipment": {
      "type": "object",
      "required": ["id", "name", "required"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string" },
        "name": { "type": "string" },
        "required": { "type": "boolean" },
        "alternatives": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },

    "Contraindication": {
      "type": "object",
      "required": ["condition", "action"],
      "additionalProperties": false,
      "properties": {
        "condition": { "type": "string" },
        "action": {
          "type": "string",
          "enum": ["exclude", "modify"]
        },
        "affected_activities": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },

    "TimeCommitment": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "min_days_per_week": { "type": "integer", "minimum": 1, "maximum": 7 },
        "max_days_per_week": { "type": "integer", "minimum": 1, "maximum": 7 },
        "min_minutes_per_day": { "type": "integer", "minimum": 0 },
        "max_minutes_per_day": { "type": "integer", "minimum": 0 }
      }
    },

    "Personalization": {
      "type": "object",
      "required": ["inputs", "rules"],
      "additionalProperties": false,
      "properties": {
        "inputs": {
          "type": "array",
          "items": { "$ref": "#/$defs/PersonalizationInput" }
        },
        "rules": {
          "type": "array",
          "items": { "$ref": "#/$defs/PersonalizationRule" }
        }
      }
    },

    "PersonalizationInput": {
      "type": "object",
      "required": ["id", "type", "source"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string" },
        "type": {
          "type": "string",
          "enum": ["number", "string", "array", "enum", "boolean"]
        },
        "source": { "type": "string" },
        "label": { "type": "string" },
        "options": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },

    "PersonalizationRule": {
      "type": "object",
      "required": ["id", "condition", "actions"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "condition": { "$ref": "#/$defs/Condition" },
        "actions": {
          "type": "array",
          "items": { "$ref": "#/$defs/Action" },
          "minItems": 1
        }
      }
    },

    "Condition": {
      "oneOf": [
        { "$ref": "#/$defs/SimpleCondition" },
        { "$ref": "#/$defs/CompoundCondition" }
      ]
    },

    "SimpleCondition": {
      "type": "object",
      "required": ["field", "op", "value"],
      "additionalProperties": false,
      "properties": {
        "field": { "type": "string" },
        "op": {
          "type": "string",
          "enum": ["eq", "neq", "gt", "gte", "lt", "lte", "contains", "not_contains"]
        },
        "value": {}
      }
    },

    "CompoundCondition": {
      "type": "object",
      "required": ["operator", "conditions"],
      "additionalProperties": false,
      "properties": {
        "operator": {
          "type": "string",
          "enum": ["and", "or"]
        },
        "conditions": {
          "type": "array",
          "items": { "$ref": "#/$defs/SimpleCondition" },
          "minItems": 1
        }
      }
    },

    "Action": {
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string"
        },
        "scope": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },

    "Phase": {
      "type": "object",
      "required": ["id", "name", "order"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "name": { "type": "string" },
        "order": { "type": "integer", "minimum": 1 },
        "description": { "type": "string" },
        "duration": { "$ref": "#/$defs/Duration" },
        "weeks": {
          "type": "array",
          "items": { "$ref": "#/$defs/Week" }
        }
      }
    },

    "Week": {
      "type": "object",
      "required": ["id", "name", "order"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "name": { "type": "string" },
        "order": { "type": "integer", "minimum": 1 },
        "days": {
          "type": "array",
          "items": { "$ref": "#/$defs/Day" }
        }
      }
    },

    "Day": {
      "type": "object",
      "required": ["id", "day_of_week", "type"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "day_of_week": { "type": "integer", "minimum": 1, "maximum": 7 },
        "type": {
          "type": "string",
          "enum": ["training", "rest", "active_recovery", "assessment"]
        },
        "name": { "type": "string" },
        "estimated_duration_minutes": { "type": "integer", "minimum": 0 },
        "blocks": {
          "type": "array",
          "items": { "$ref": "#/$defs/Block" }
        }
      }
    },

    "Block": {
      "type": "object",
      "required": ["id", "type", "order"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string" },
        "type": {
          "type": "string",
          "enum": ["warmup", "main", "cooldown", "nutrition", "meditation", "education", "assessment"]
        },
        "order": { "type": "integer", "minimum": 1 },
        "structure": {
          "type": "string",
          "enum": ["circuit", "straight_sets", "superset", "emom", "amrap", "tabata"]
        },
        "rounds": { "type": "integer", "minimum": 1 },
        "rest_between_rounds": { "$ref": "#/$defs/Duration" },
        "activities": {
          "type": "array",
          "items": { "$ref": "#/$defs/Activity" }
        }
      }
    },

    "Activity": {
      "oneOf": [
        { "$ref": "#/$defs/ExerciseActivity" },
        { "$ref": "#/$defs/CardioActivity" },
        { "$ref": "#/$defs/NutritionActivity" },
        { "$ref": "#/$defs/MeditationActivity" },
        { "$ref": "#/$defs/RecoveryActivity" },
        { "$ref": "#/$defs/HabitActivity" },
        { "$ref": "#/$defs/SimpleActivityOutput" }
      ]
    },

    "ExerciseActivity": {
      "type": "object",
      "required": ["id", "type", "exercise_ref"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "exercise" },
        "exercise_ref": { "type": "string" },
        "name": { "type": "string" },
        "prescription": { "$ref": "#/$defs/ExercisePrescription" },
        "target_rpe": { "type": "number", "minimum": 1, "maximum": 10 },
        "target_rir": { "type": "number", "minimum": 0 }
      }
    },

    "ExercisePrescription": {
      "type": "object",
      "required": ["type"],
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "enum": ["sets_reps", "time", "distance", "amrap", "continuous", "intervals"]
        },
        "sets": { "type": "integer", "minimum": 1 },
        "reps": { "$ref": "#/$defs/Reps" },
        "rest": { "$ref": "#/$defs/Duration" },
        "tempo": { "type": "string" },
        "weight": { "$ref": "#/$defs/Weight" },
        "duration": { "$ref": "#/$defs/Duration" }
      }
    },

    "Reps": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "target": { "type": "integer", "minimum": 1 },
        "min": { "type": "integer", "minimum": 1 },
        "max": { "type": "integer", "minimum": 1 }
      }
    },

    "Weight": {
      "oneOf": [
        {
          "type": "object",
          "required": ["type"],
          "additionalProperties": false,
          "properties": {
            "type": { "const": "bodyweight" }
          }
        },
        {
          "type": "object",
          "required": ["type"],
          "additionalProperties": false,
          "properties": {
            "type": { "enum": ["absolute", "percentage_1rm"] },
            "value": { "type": "number" },
            "unit": { "type": "string" }
          }
        }
      ]
    },

    "CardioActivity": {
      "type": "object",
      "required": ["id", "type", "name", "modality", "prescription"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "cardio" },
        "name": { "type": "string" },
        "modality": { "type": "string" },
        "prescription": { "$ref": "#/$defs/CardioPrescription" }
      }
    },

    "CardioPrescription": {
      "type": "object",
      "required": ["type"],
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "enum": ["continuous", "intervals", "fartlek"]
        },
        "duration": { "$ref": "#/$defs/Duration" },
        "intensity": {
          "type": "object",
          "required": ["type"],
          "additionalProperties": true,
          "properties": {
            "type": {
              "type": "string",
              "enum": ["heart_rate_zone", "rpe", "pace"]
            },
            "target": { "type": "object", "additionalProperties": true }
          }
        },
        "intervals": {
          "type": "object",
          "required": ["work", "rest", "repeat"],
          "additionalProperties": false,
          "properties": {
            "work": {
              "type": "object",
              "required": ["duration"],
              "additionalProperties": false,
              "properties": {
                "duration": { "type": "number" }
              }
            },
            "rest": {
              "type": "object",
              "required": ["duration"],
              "additionalProperties": false,
              "properties": {
                "duration": { "type": "number" }
              }
            },
            "repeat": { "type": "integer", "minimum": 1 }
          }
        }
      }
    },

    "NutritionActivity": {
      "type": "object",
      "required": ["id", "type", "name", "category"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "nutrition" },
        "name": { "type": "string" },
        "category": { "type": "string" },
        "prescription": { "$ref": "#/$defs/NutritionPrescription" },
        "timing": { "$ref": "#/$defs/NutritionTiming" }
      }
    },

    "NutritionPrescription": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "macros": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "protein": { "$ref": "#/$defs/MacroRange" },
            "carbs": { "$ref": "#/$defs/MacroRange" },
            "fat": { "$ref": "#/$defs/MacroRange" }
          }
        },
        "calories": {
          "type": "object",
          "required": ["min", "max"],
          "additionalProperties": false,
          "properties": {
            "min": { "type": "number" },
            "max": { "type": "number" }
          }
        },
        "suggestions": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },

    "MacroRange": {
      "type": "object",
      "required": ["min", "max", "unit"],
      "additionalProperties": false,
      "properties": {
        "min": { "type": "number" },
        "max": { "type": "number" },
        "unit": { "const": "g" }
      }
    },

    "NutritionTiming": {
      "type": "object",
      "required": ["type"],
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "enum": ["relative", "absolute"]
        },
        "reference": { "type": "string" },
        "offset": { "$ref": "#/$defs/Duration" },
        "time": { "type": "string", "pattern": "^\\d{2}:\\d{2}$" }
      }
    },

    "MeditationActivity": {
      "type": "object",
      "required": ["id", "type", "name", "category"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "meditation" },
        "name": { "type": "string" },
        "category": { "type": "string" },
        "prescription": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "duration": { "$ref": "#/$defs/Duration" },
            "guided": { "type": "boolean" }
          }
        }
      }
    },

    "RecoveryActivity": {
      "type": "object",
      "required": ["id", "type", "name", "category"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "recovery" },
        "name": { "type": "string" },
        "category": { "type": "string" },
        "prescription": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "duration": { "$ref": "#/$defs/Duration" },
            "exercises": {
              "type": "array",
              "items": { "$ref": "#/$defs/RecoveryExercise" }
            }
          }
        }
      }
    },

    "RecoveryExercise": {
      "type": "object",
      "required": ["id", "type", "name"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "recovery_exercise" },
        "name": { "type": "string" },
        "hold_seconds": { "type": "number", "minimum": 0 },
        "reps": { "type": "integer", "minimum": 1 },
        "sides": {
          "type": "string",
          "enum": ["both", "left", "right"]
        }
      }
    },

    "HabitActivity": {
      "type": "object",
      "required": ["id", "type", "name", "category"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "habit" },
        "name": { "type": "string" },
        "category": { "type": "string" },
        "prescription": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "target": {
              "type": "object",
              "additionalProperties": false,
              "properties": {
                "value": { "type": "number" },
                "unit": { "type": "string" }
              }
            },
            "frequency": { "type": "string" },
            "reminders": {
              "type": "array",
              "items": { "type": "string" }
            },
            "reminder_times": {
              "type": "array",
              "items": { "type": "string" }
            }
          }
        },
        "tracking": {
          "type": "object",
          "additionalProperties": true
        }
      }
    },

    "SimpleActivityOutput": {
      "type": "object",
      "required": ["id", "type", "name"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "type": { "const": "simple" },
        "name": { "type": "string" },
        "duration": { "$ref": "#/$defs/Duration" }
      }
    },

    "Progress": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "checkpoints": {
          "type": "array",
          "items": { "$ref": "#/$defs/Checkpoint" }
        },
        "points_system": { "$ref": "#/$defs/PointsConfig" },
        "streaks": {
          "type": "object",
          "description": "Streak tracking config; shape TBD in v1.x.",
          "additionalProperties": true
        }
      }
    },

    "Checkpoint": {
      "type": "object",
      "required": ["id", "name"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9_-]*$" },
        "name": { "type": "string" },
        "at": {
          "type": "object",
          "required": ["value", "unit"],
          "additionalProperties": false,
          "properties": {
            "value": { "type": "number" },
            "unit": { "type": "string" }
          }
        },
        "measurements": {
          "type": "array",
          "items": { "type": "string" }
        },
        "questions": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },

    "PointsConfig": {
      "type": "object",
      "required": ["enabled"],
      "additionalProperties": false,
      "properties": {
        "enabled": { "type": "boolean" },
        "rules": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["action", "points"],
            "additionalProperties": false,
            "properties": {
              "action": { "type": "string" },
              "points": { "type": "number" }
            }
          }
        }
      }
    },

    "Notification": {
      "type": "object",
      "required": ["id", "enabled", "message"],
      "additionalProperties": false,
      "properties": {
        "id": { "type": "string" },
        "enabled": { "type": "boolean" },
        "message": { "type": "string" },
        "timing_offset": { "$ref": "#/$defs/Duration" },
        "timing_reference": { "type": "string" }
      }
    }
  }
}