{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/hasaneyldrm/exercises-dataset/blob/main/data/exercises.schema.json",
  "title": "Exercises Dataset",
  "description": "Schema for data/exercises.json — an array of fitness exercise records with multilingual instructions and media references.",
  "type": "array",
  "items": {
    "$ref": "#/$defs/exercise"
  },
  "$defs": {
    "languageMap": {
      "type": "object",
      "description": "Instruction text keyed by ISO 639-1 language code.",
      "properties": {
        "en": { "type": "string" },
        "es": { "type": "string" },
        "it": { "type": "string" },
        "tr": { "type": "string" },
        "ru": { "type": "string" },
        "zh": { "type": "string" }
      },
      "required": ["en", "es", "it", "tr", "ru", "zh"],
      "additionalProperties": { "type": "string" }
    },
    "languageStepsMap": {
      "type": "object",
      "description": "Step-by-step instructions as an array of strings, keyed by ISO 639-1 language code.",
      "properties": {
        "en": { "$ref": "#/$defs/steps" },
        "es": { "$ref": "#/$defs/steps" },
        "it": { "$ref": "#/$defs/steps" },
        "tr": { "$ref": "#/$defs/steps" },
        "ru": { "$ref": "#/$defs/steps" },
        "zh": { "$ref": "#/$defs/steps" }
      },
      "required": ["en", "es", "it", "tr", "ru", "zh"],
      "additionalProperties": { "$ref": "#/$defs/steps" }
    },
    "steps": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 }
    },
    "exercise": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "description": "Unique numeric identifier, zero-padded to 4 digits (e.g. \"0001\").",
          "pattern": "^[0-9]{4}$"
        },
        "name": {
          "type": "string",
          "description": "Full exercise name (e.g. \"3/4 sit-up\").",
          "minLength": 1
        },
        "category": {
          "type": "string",
          "description": "Body part category. Mirrors body_part.",
          "minLength": 1
        },
        "body_part": {
          "type": "string",
          "description": "Body part targeted.",
          "enum": [
            "back",
            "cardio",
            "chest",
            "lower arms",
            "lower legs",
            "neck",
            "shoulders",
            "upper arms",
            "upper legs",
            "waist"
          ]
        },
        "equipment": {
          "type": "string",
          "description": "Required equipment (e.g. \"dumbbell\", \"body weight\").",
          "minLength": 1
        },
        "instructions": {
          "$ref": "#/$defs/languageMap",
          "description": "Full step-by-step instructions as a single string per language."
        },
        "instruction_steps": {
          "$ref": "#/$defs/languageStepsMap",
          "description": "Same instructions split into an ordered array of steps per language."
        },
        "muscle_group": {
          "type": "string",
          "description": "Primary synergist muscle group.",
          "minLength": 1
        },
        "secondary_muscles": {
          "type": "array",
          "description": "Additional muscles involved.",
          "items": { "type": "string", "minLength": 1 }
        },
        "target": {
          "type": "string",
          "description": "Primary target muscle (e.g. \"biceps\", \"abs\").",
          "minLength": 1
        },
        "media_id": {
          "type": "string",
          "description": "Original media reference id (e.g. \"2gPfomN\").",
          "minLength": 1
        },
        "image": {
          "type": "string",
          "description": "Path to the 180x180 thumbnail (e.g. \"images/0001-2gPfomN.jpg\").",
          "pattern": "^images/.+\\.(jpg|jpeg|png)$"
        },
        "gif_url": {
          "type": "string",
          "description": "Path to the 180x180 animation GIF (e.g. \"videos/0001-2gPfomN.gif\").",
          "pattern": "^videos/.+\\.gif$"
        },
        "attribution": {
          "type": "string",
          "description": "Media copyright notice.",
          "minLength": 1
        },
        "created_at": {
          "type": "string",
          "description": "ISO 8601 timestamp of record creation.",
          "format": "date-time"
        }
      },
      "required": [
        "id",
        "name",
        "category",
        "body_part",
        "equipment",
        "instructions",
        "instruction_steps",
        "muscle_group",
        "secondary_muscles",
        "target",
        "media_id",
        "image",
        "gif_url",
        "attribution",
        "created_at"
      ],
      "additionalProperties": false
    }
  }
}