{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.wtf-p.dev/project/checkpoint/v1",
  "type": "object",
  "additionalProperties": false,
  "allOf": [
    {
      "if": {
        "required": ["kind"],
        "properties": { "kind": { "const": "state-snapshot" } }
      },
      "then": {
        "required": ["snapshot"],
        "properties": {
          "status": { "enum": ["available", "restored", "expired"] },
          "blocking": { "const": false }
        }
      },
      "else": {
        "not": { "required": ["snapshot"] },
        "properties": {
          "status": { "enum": ["pending", "resolved", "waived", "expired"] }
        }
      }
    }
  ],
  "required": [
    "schema",
    "id",
    "project_id",
    "kind",
    "status",
    "blocking",
    "scope_uri",
    "request",
    "options",
    "resume_action",
    "created_at"
  ],
  "properties": {
    "schema": { "const": "wtfp.project.checkpoint/v1" },
    "id": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
    "project_id": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
    "kind": { "enum": ["human-verify", "decision", "human-action", "safety-authorization", "state-snapshot"] },
    "status": { "enum": ["pending", "resolved", "waived", "expired", "available", "restored"] },
    "blocking": { "type": "boolean" },
    "scope_uri": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
    "request": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
    "context": { "type": "string" },
    "options": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "label", "implication"],
        "properties": {
          "id": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
          "label": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
          "implication": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" }
        }
      }
    },
    "resume_action": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
    "created_at": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/timestamp" },
    "snapshot": {
      "type": "object",
      "additionalProperties": false,
      "required": ["archive_uri", "resources"],
      "properties": {
        "archive_uri": {
          "type": "string",
          "pattern": "^project://archives/checkpoints/[A-Za-z0-9._~-]+$"
        },
        "resources": {
          "type": "array",
          "minItems": 1,
          "items": {
            "type": "object",
            "additionalProperties": false,
            "required": ["uri", "sha256"],
            "properties": {
              "uri": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
              "revision": { "type": "integer", "minimum": 0 },
              "sha256": { "type": "string", "pattern": "^[a-f0-9]{64}$" }
            }
          }
        }
      }
    },
    "resolution": {
      "type": "object",
      "additionalProperties": false,
      "required": ["resolved_by", "summary", "resolved_at"],
      "properties": {
        "resolved_by": { "enum": ["author", "policy"] },
        "selected_option": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
        "summary": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
        "resolved_at": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/timestamp" }
      }
    }
  }
}