syntax = "proto3";

package worldmonitor.news.v1;

import "buf/validate/validate.proto";
import "sebuf/http/annotations.proto";
import "worldmonitor/core/v1/geo.proto";

// NewsItem represents a single news article from RSS feed aggregation.
message NewsItem {
  // Source feed name.
  string source = 1 [
    (buf.validate.field).required = true,
    (buf.validate.field).string.min_len = 1
  ];
  // Article headline.
  string title = 2 [
    (buf.validate.field).required = true,
    (buf.validate.field).string.min_len = 1
  ];
  // Article URL.
  string link = 3;
  // Publication time, as Unix epoch milliseconds.
  int64 published_at = 4 [(sebuf.http.int64_encoding) = INT64_ENCODING_NUMBER];
  // Whether this article triggered an alert condition.
  bool is_alert = 5;
  // Threat classification, if assessed.
  ThreatClassification threat = 6;
  // Geolocation extracted from the article.
  worldmonitor.core.v1.GeoCoordinates location = 7;
  // Human-readable location name.
  string location_name = 8;
  // Composite importance score (0-100): severity × 55% + source tier × 20% + corroboration × 15% + recency × 10%.
  int32 importance_score = 9;
  // Number of distinct sources that reported the same story in this digest cycle.
  int32 corroboration_count = 10;
  // Story lifecycle metadata derived from cross-cycle persistence data.
  StoryMeta story_meta = 11;
}

// StoryMeta carries cross-cycle persistence data attached to each news item.
message StoryMeta {
  // Epoch ms when the story first appeared in any digest cycle.
  int64 first_seen = 1 [(sebuf.http.int64_encoding) = INT64_ENCODING_NUMBER];
  // Total number of digest cycles in which this story appeared.
  int32 mention_count = 2;
  // Number of unique sources that reported this story (cached from Redis Set).
  int32 source_count = 3;
  // Story lifecycle phase derived from persistence data.
  StoryPhase phase = 4;
}

// StoryPhase represents the lifecycle stage of a tracked news story.
enum StoryPhase {
  // Unspecified or not yet tracked.
  STORY_PHASE_UNSPECIFIED = 0;
  // First appearance in any digest cycle.
  STORY_PHASE_BREAKING = 1;
  // 2–5 mentions and less than 2 hours old.
  STORY_PHASE_DEVELOPING = 2;
  // 6+ mentions or older than 2 hours; still active.
  STORY_PHASE_SUSTAINED = 3;
  // currentScore dropped below 50% of peakScore — story losing traction.
  STORY_PHASE_FADING = 4;
}

// ThreatClassification represents an AI-assessed threat level for a news item.
message ThreatClassification {
  // Overall threat level.
  ThreatLevel level = 1;
  // Event category.
  string category = 2;
  // Confidence score (0.0 to 1.0).
  double confidence = 3 [
    (buf.validate.field).double.gte = 0,
    (buf.validate.field).double.lte = 1
  ];
  // Classification source — "keyword", "ml", or "llm".
  string source = 4;
}

// HeadlineSummary represents an AI-generated summary of recent headlines.
message HeadlineSummary {
  // Summary text.
  string text = 1;
  // Number of headlines analyzed.
  int32 headline_count = 2;
  // Summary generation time, as Unix epoch milliseconds.
  int64 generated_at = 3 [(sebuf.http.int64_encoding) = INT64_ENCODING_NUMBER];
  // AI model used for summarization.
  string model = 4;
}

// ThreatLevel represents the assessed threat level of a news event.
enum ThreatLevel {
  // Unspecified threat level.
  THREAT_LEVEL_UNSPECIFIED = 0;
  // Low threat — routine reporting.
  THREAT_LEVEL_LOW = 1;
  // Medium threat — warrants monitoring.
  THREAT_LEVEL_MEDIUM = 2;
  // High threat — significant concern.
  THREAT_LEVEL_HIGH = 3;
  // Critical threat — immediate attention required.
  THREAT_LEVEL_CRITICAL = 4;
}
