{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.wtf-p.dev/project/section/v1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "id",
    "project_id",
    "outline_uri",
    "title",
    "goal",
    "status",
    "word_target",
    "word_count",
    "wave",
    "depends_on",
    "claims",
    "artifacts",
    "checkpoint_uris",
    "validation_uris",
    "updated_at"
  ],
  "properties": {
    "schema": { "const": "wtfp.project.section/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" },
    "outline_uri": { "const": "project://structure/outline" },
    "title": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
    "goal": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
    "status": {
      "enum": ["not-started", "researching", "planned", "writing", "reviewing", "complete", "blocked"]
    },
    "word_target": { "type": "integer", "minimum": 1 },
    "word_count": { "type": "integer", "minimum": 0 },
    "wave": { "type": "integer", "minimum": 1 },
    "depends_on": {
      "type": "array",
      "items": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
      "uniqueItems": true
    },
    "claims": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "statement", "status", "evidence_required", "evidence_uris"],
        "properties": {
          "id": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/identifier" },
          "statement": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/nonEmptyString" },
          "status": { "enum": ["planned", "drafted", "verified", "rejected"] },
          "evidence_required": { "type": "boolean" },
          "evidence_uris": {
            "type": "array",
            "items": { "type": "string", "pattern": "^project://evidence/[A-Za-z0-9._~-]+$" },
            "uniqueItems": true
          }
        }
      }
    },
    "artifacts": {
      "type": "object",
      "additionalProperties": false,
      "required": ["plans", "reviews"],
      "properties": {
        "context": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
        "research": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
        "plans": {
          "type": "array",
          "items": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
          "uniqueItems": true
        },
        "reviews": {
          "type": "array",
          "items": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
          "uniqueItems": true
        },
        "manuscript": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
        "summary": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" },
        "handoff": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/logicalUri" }
      }
    },
    "checkpoint_uris": {
      "type": "array",
      "items": { "type": "string", "pattern": "^project://checkpoints/[A-Za-z0-9._~-]+$" },
      "uniqueItems": true
    },
    "validation_uris": {
      "type": "array",
      "items": { "type": "string", "pattern": "^project://validations/[A-Za-z0-9._~-]+$" },
      "uniqueItems": true
    },
    "updated_at": { "$ref": "https://schemas.wtf-p.dev/project/common/v1#/$defs/timestamp" }
  }
}