{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://memind.local/schemas/evidence-envelope.v1.schema.json",
  "title": "EvidenceEnvelope",
  "description": "通用 Evidence Contract v1。所有 Source（MeInput、Chat、Calendar、Browser、Git…）统一产出此结构；UMS 只消费 Envelope，不依赖各 Source 内部表结构。",
  "type": "object",
  "required": [
    "evidence_id",
    "user_id",
    "source_type",
    "source_ref",
    "occurred_at",
    "evidence_type",
    "payload",
    "content_hash",
    "schema_version"
  ],
  "properties": {
    "evidence_id": {
      "type": "string",
      "format": "uuid",
      "description": "Evidence 全局唯一 ID（由 Source 或 Export 层生成）"
    },
    "user_id": {
      "type": "string",
      "format": "uuid",
      "description": "MeMind h5_users.id"
    },
    "source_type": {
      "type": "string",
      "enum": ["meinput", "chat", "calendar", "browser", "git", "mail", "filesystem", "voice", "location"],
      "description": "Evidence Source 类型，与 MeMind Source 体系对齐"
    },
    "source_ref": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "description": "Source 内稳定引用，如 segment_id / message_id / commit_sha"
    },
    "occurred_at": {
      "type": "string",
      "format": "date-time",
      "description": "Evidence 发生时间（用户行为时间，非入库时间）"
    },
    "received_at": {
      "type": "string",
      "format": "date-time",
      "description": "Source 侧接收/导出时间，可选"
    },
    "evidence_type": {
      "type": "string",
      "enum": [
        "expression_segment",
        "expression_commit",
        "expression_session",
        "chat_message",
        "calendar_event",
        "browser_visit",
        "git_commit",
        "aggregate_daily",
        "timeline_report"
      ],
      "description": "Evidence 语义类型，决定 payload 子 schema"
    },
    "payload": {
      "type": "object",
      "description": "类型化载荷，见 $defs"
    },
    "content_hash": {
      "type": "string",
      "pattern": "^[a-f0-9]{64}$",
      "description": "SHA-256(canonical_json(payload)+evidence_type+source_ref)，用于幂等与去重"
    },
    "schema_version": {
      "type": "integer",
      "const": 1
    },
    "privacy_level": {
      "type": "string",
      "enum": ["normal", "restricted", "secure_skip"],
      "default": "normal",
      "description": "secure_skip 的 Evidence 不应离开 Source；Export 层必须过滤"
    },
    "locale": {
      "type": "string",
      "description": "如 zh-CN，可选"
    }
  },
  "additionalProperties": false,
  "$defs": {
    "ExpressionSegmentPayload": {
      "type": "object",
      "required": ["text", "start_at", "end_at", "event_ids"],
      "properties": {
        "text": { "type": "string", "minLength": 1 },
        "start_at": { "type": "string", "format": "date-time" },
        "end_at": { "type": "string", "format": "date-time" },
        "event_ids": { "type": "array", "items": { "type": "string", "format": "uuid" }, "minItems": 1 },
        "event_count": { "type": "integer", "minimum": 1 },
        "context": {
          "type": "object",
          "properties": {
            "app": { "type": ["string", "null"] },
            "app_bundle_id": { "type": ["string", "null"] },
            "device_id": { "type": "string" },
            "scene": { "type": "string" },
            "input_method": { "type": ["string", "null"] },
            "language": { "type": ["string", "null"] }
          }
        }
      },
      "additionalProperties": false
    },
    "AggregateDailyPayload": {
      "type": "object",
      "required": ["day", "stats"],
      "properties": {
        "day": { "type": "string", "format": "date" },
        "stats": {
          "type": "object",
          "properties": {
            "events": { "type": "integer", "minimum": 0 },
            "segments": { "type": "integer", "minimum": 0 },
            "chars": { "type": "integer", "minimum": 0 },
            "peak_hour": { "type": "integer", "minimum": 0, "maximum": 23 },
            "top_apps": { "type": "array", "items": { "type": "string" } },
            "top_terms": { "type": "array", "items": { "type": "string" } }
          }
        }
      },
      "additionalProperties": false
    },
    "TimelineReportPayload": {
      "type": "object",
      "required": ["report_type", "period_key", "edition", "status", "content"],
      "properties": {
        "report_type": { "type": "string", "enum": ["daily_close", "weekly_review"] },
        "period_key": { "type": "string" },
        "edition": { "type": "integer", "minimum": 1 },
        "status": { "type": "string", "enum": ["published", "revoked"] },
        "content": { "type": "object" }
      },
      "additionalProperties": false
    }
  }
}