{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://labfytools.com/trainlog/schema/trainlog-v1.schema.json",
  "title": "Trainlog Exchange Format v1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "format",
    "version",
    "exercises",
    "session"
  ],
  "properties": {
    "format": {
      "const": "trainlog"
    },
    "version": {
      "const": 1
    },
    "exercises": {
      "type": "array",
      "maxItems": 1000,
      "items": {
        "$ref": "#/$defs/exerciseCatalogEntry"
      }
    },
    "session": {
      "$ref": "#/$defs/session"
    }
  },
  "$defs": {
    "exerciseId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 128,
      "pattern": "^[a-z0-9][a-z0-9_-]*$"
    },
    "sessionId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 128,
      "pattern": "^[A-Za-z0-9][A-Za-z0-9_-]*$"
    },
    "note": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4000
    },
    "exerciseCatalogEntry": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "exercise_id",
        "name",
        "tracking_mode"
      ],
      "properties": {
        "exercise_id": {
          "$ref": "#/$defs/exerciseId"
        },
        "name": {
          "type": "string",
          "minLength": 1,
          "maxLength": 200
        },
        "tracking_mode": {
          "type": "string",
          "enum": [
            "reps",
            "duration"
          ]
        }
      }
    },
    "actualSet": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "reps": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10000
        },
        "duration_seconds": {
          "type": "integer",
          "minimum": 1,
          "maximum": 86400
        },
        "weight_kg": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 5000
        }
      },
      "oneOf": [
        {
          "required": [
            "reps"
          ],
          "not": {
            "required": [
              "duration_seconds"
            ]
          }
        },
        {
          "required": [
            "duration_seconds"
          ],
          "not": {
            "required": [
              "reps"
            ]
          }
        }
      ]
    },
    "target": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "sets"
      ],
      "properties": {
        "sets": {
          "type": "integer",
          "minimum": 1,
          "maximum": 1000
        },
        "reps": {
          "type": "integer",
          "minimum": 1,
          "maximum": 10000
        },
        "duration_seconds": {
          "type": "integer",
          "minimum": 1,
          "maximum": 86400
        },
        "weight_kg": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 5000
        }
      },
      "oneOf": [
        {
          "required": [
            "reps"
          ],
          "not": {
            "required": [
              "duration_seconds"
            ]
          }
        },
        {
          "required": [
            "duration_seconds"
          ],
          "not": {
            "required": [
              "reps"
            ]
          }
        }
      ]
    },
    "sessionExercise": {
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      "additionalProperties": false,
      "required": [
        "exercise_id",
        "load_mode",
        "rest_seconds",
        "target",
        "sets"
      ],
      "properties": {
        "exercise_id": {
          "$ref": "#/$defs/exerciseId"
        },
        "load_mode": {
          "type": "string",
          "enum": [
            "none",
            "external",
            "assistance"
          ]
        },
        "rest_seconds": {
          "type": "integer",
          "minimum": 0,
          "maximum": 86400
        },
        "target": {
          "$ref": "#/$defs/target"
        },
        "sets": {
          "type": "array",
          "maxItems": 1000,
          "items": {
            "$ref": "#/$defs/actualSet"
          }
        },
        "notes": {
          "type": "string",
          "minLength": 1,
          "maxLength": 1000
        }
      }
    },
    "measurements": {
      "type": "object",
      "additionalProperties": false,
      "minProperties": 1,
      "properties": {
        "neck_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "shoulders_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "chest_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "waist_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "hips_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "left_arm_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "right_arm_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "left_forearm_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "right_forearm_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "left_thigh_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "right_thigh_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "left_calf_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        },
        "right_calf_cm": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 500
        }
      }
    },
    "session": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "session_id",
        "started_at",
        "exercises"
      ],
      "properties": {
        "session_id": {
          "$ref": "#/$defs/sessionId"
        },
        "started_at": {
          "type": "string",
          "format": "date-time"
        },
        "ended_at": {
          "type": "string",
          "format": "date-time"
        },
        "body_weight_kg": {
          "type": "number",
          "exclusiveMinimum": 0,
          "maximum": 1000
        },
        "measurements": {
          "$ref": "#/$defs/measurements"
        },
        "notes": {
          "$ref": "#/$defs/note"
        },
        "exercises": {
          "type": "array",
          "maxItems": 1000,
          "items": {
            "$ref": "#/$defs/sessionExercise"
          }
        }
      }
    }
  }
}