openapi: 3.1.0
info:
    title: NewsService API
    version: 1.0.0
paths:
    /api/news/v1/summarize-article:
        post:
            tags:
                - NewsService
            summary: SummarizeArticle
            description: SummarizeArticle generates an LLM summary with provider selection and fallback support.
            operationId: SummarizeArticle
            requestBody:
                content:
                    application/json:
                        schema:
                            $ref: '#/components/schemas/SummarizeArticleRequest'
                required: true
            responses:
                "200":
                    description: Successful response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/SummarizeArticleResponse'
                "400":
                    description: Validation error
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/ValidationError'
                default:
                    description: Error response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/Error'
    /api/news/v1/summarize-article-cache:
        get:
            tags:
                - NewsService
            summary: GetSummarizeArticleCache
            description: GetSummarizeArticleCache looks up a cached summary by deterministic key (CDN-cacheable GET).
            operationId: GetSummarizeArticleCache
            parameters:
                - name: cache_key
                  in: query
                  description: Deterministic cache key computed by buildSummaryCacheKey().
                  required: false
                  schema:
                    type: string
            responses:
                "200":
                    description: Successful response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/SummarizeArticleResponse'
                "400":
                    description: Validation error
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/ValidationError'
                default:
                    description: Error response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/Error'
    /api/news/v1/list-feed-digest:
        get:
            tags:
                - NewsService
            summary: ListFeedDigest
            description: ListFeedDigest returns a pre-aggregated digest of all RSS feeds for a site variant.
            operationId: ListFeedDigest
            parameters:
                - name: variant
                  in: query
                  description: 'Site variant: full, tech, finance, happy'
                  required: false
                  schema:
                    type: string
                - name: lang
                  in: query
                  description: ISO 639-1 language code (en, fr, ar, etc.)
                  required: false
                  schema:
                    type: string
            responses:
                "200":
                    description: Successful response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/ListFeedDigestResponse'
                "400":
                    description: Validation error
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/ValidationError'
                default:
                    description: Error response
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/Error'
components:
    schemas:
        Error:
            type: object
            properties:
                message:
                    type: string
                    description: Error message (e.g., 'user not found', 'database connection failed')
            description: Error is returned when a handler encounters an error. It contains a simple error message that the developer can customize.
        FieldViolation:
            type: object
            properties:
                field:
                    type: string
                    description: The field path that failed validation (e.g., 'user.email' for nested fields). For header validation, this will be the header name (e.g., 'X-API-Key')
                description:
                    type: string
                    description: Human-readable description of the validation violation (e.g., 'must be a valid email address', 'required field missing')
            required:
                - field
                - description
            description: FieldViolation describes a single validation error for a specific field.
        ValidationError:
            type: object
            properties:
                violations:
                    type: array
                    items:
                        $ref: '#/components/schemas/FieldViolation'
                    description: List of validation violations
            required:
                - violations
            description: ValidationError is returned when request validation fails. It contains a list of field violations describing what went wrong.
        SummarizeArticleRequest:
            type: object
            properties:
                provider:
                    type: string
                    minLength: 1
                    description: 'LLM provider: "ollama", "groq", "openrouter"'
                headlines:
                    type: array
                    items:
                        type: string
                        minItems: 1
                        description: Headlines to summarize (max 8 used).
                    minItems: 1
                mode:
                    type: string
                    description: 'Summarization mode: "brief", "analysis", "translate", "" (default).'
                geoContext:
                    type: string
                    description: Geographic signal context to include in the prompt.
                variant:
                    type: string
                    description: 'Variant: "full", "tech", or target language for translate mode.'
                lang:
                    type: string
                    description: Output language code, default "en".
                systemAppend:
                    type: string
                    description: Optional system prompt append for analytical framework instructions.
            required:
                - provider
            description: SummarizeArticleRequest specifies parameters for LLM article summarization.
        SummarizeArticleResponse:
            type: object
            properties:
                summary:
                    type: string
                    description: The generated summary text.
                model:
                    type: string
                    description: Model identifier used for generation.
                provider:
                    type: string
                    description: Provider that produced the result (or "cache").
                tokens:
                    type: integer
                    format: int32
                    description: Token count from the LLM response.
                fallback:
                    type: boolean
                    description: Whether the client should try the next provider in the fallback chain.
                error:
                    type: string
                    description: Error message if the request failed.
                errorType:
                    type: string
                    description: Error type/name (e.g. "TypeError").
                status:
                    type: string
                    enum:
                        - SUMMARIZE_STATUS_UNSPECIFIED
                        - SUMMARIZE_STATUS_SUCCESS
                        - SUMMARIZE_STATUS_CACHED
                        - SUMMARIZE_STATUS_SKIPPED
                        - SUMMARIZE_STATUS_ERROR
                    description: SummarizeStatus indicates the outcome of a summarization request.
                statusDetail:
                    type: string
                    description: Human-readable detail for non-success statuses (skip reason, etc.).
            description: SummarizeArticleResponse contains the LLM summarization result.
        GetSummarizeArticleCacheRequest:
            type: object
            properties:
                cacheKey:
                    type: string
                    description: Deterministic cache key computed by buildSummaryCacheKey().
            description: GetSummarizeArticleCacheRequest looks up a pre-computed summary by cache key.
        ListFeedDigestRequest:
            type: object
            properties:
                variant:
                    type: string
                    description: 'Site variant: full, tech, finance, happy'
                lang:
                    type: string
                    description: ISO 639-1 language code (en, fr, ar, etc.)
        ListFeedDigestResponse:
            type: object
            properties:
                categories:
                    type: object
                    additionalProperties:
                        $ref: '#/components/schemas/CategoryBucket'
                    description: Per-category buckets — keys match category names from feed config
                feedStatuses:
                    type: object
                    additionalProperties:
                        type: string
                    description: |-
                        Per-feed status — only non-ok states emitted; absent key implies ok.
                         Values: empty (feed returned 0 items), timeout (timed out during fetch).
                generatedAt:
                    type: string
                    description: ISO 8601 timestamp of when this digest was generated
        CategoriesEntry:
            type: object
            properties:
                key:
                    type: string
                value:
                    $ref: '#/components/schemas/CategoryBucket'
        FeedStatusesEntry:
            type: object
            properties:
                key:
                    type: string
                value:
                    type: string
        CategoryBucket:
            type: object
            properties:
                items:
                    type: array
                    items:
                        $ref: '#/components/schemas/NewsItem'
        NewsItem:
            type: object
            properties:
                source:
                    type: string
                    minLength: 1
                    description: Source feed name.
                title:
                    type: string
                    minLength: 1
                    description: Article headline.
                link:
                    type: string
                    description: Article URL.
                publishedAt:
                    type: integer
                    format: int64
                    description: 'Publication time, as Unix epoch milliseconds.. Warning: Values > 2^53 may lose precision in JavaScript'
                isAlert:
                    type: boolean
                    description: Whether this article triggered an alert condition.
                threat:
                    $ref: '#/components/schemas/ThreatClassification'
                location:
                    $ref: '#/components/schemas/GeoCoordinates'
                locationName:
                    type: string
                    description: Human-readable location name.
                importanceScore:
                    type: integer
                    format: int32
                    description: 'Composite importance score (0-100): severity × 55% + source tier × 20% + corroboration × 15% + recency × 10%.'
                corroborationCount:
                    type: integer
                    format: int32
                    description: Number of distinct sources that reported the same story in this digest cycle.
                storyMeta:
                    $ref: '#/components/schemas/StoryMeta'
            required:
                - source
                - title
            description: NewsItem represents a single news article from RSS feed aggregation.
        ThreatClassification:
            type: object
            properties:
                level:
                    type: string
                    enum:
                        - THREAT_LEVEL_UNSPECIFIED
                        - THREAT_LEVEL_LOW
                        - THREAT_LEVEL_MEDIUM
                        - THREAT_LEVEL_HIGH
                        - THREAT_LEVEL_CRITICAL
                    description: ThreatLevel represents the assessed threat level of a news event.
                category:
                    type: string
                    description: Event category.
                confidence:
                    type: number
                    maximum: 1
                    minimum: 0
                    format: double
                    description: Confidence score (0.0 to 1.0).
                source:
                    type: string
                    description: Classification source — "keyword", "ml", or "llm".
            description: ThreatClassification represents an AI-assessed threat level for a news item.
        GeoCoordinates:
            type: object
            properties:
                latitude:
                    type: number
                    maximum: 90
                    minimum: -90
                    format: double
                    description: Latitude in decimal degrees (-90 to 90).
                longitude:
                    type: number
                    maximum: 180
                    minimum: -180
                    format: double
                    description: Longitude in decimal degrees (-180 to 180).
            description: GeoCoordinates represents a geographic location using WGS84 coordinates.
        StoryMeta:
            type: object
            properties:
                firstSeen:
                    type: integer
                    format: int64
                    description: 'Epoch ms when the story first appeared in any digest cycle.. Warning: Values > 2^53 may lose precision in JavaScript'
                mentionCount:
                    type: integer
                    format: int32
                    description: Total number of digest cycles in which this story appeared.
                sourceCount:
                    type: integer
                    format: int32
                    description: Number of unique sources that reported this story (cached from Redis Set).
                phase:
                    type: string
                    enum:
                        - STORY_PHASE_UNSPECIFIED
                        - STORY_PHASE_BREAKING
                        - STORY_PHASE_DEVELOPING
                        - STORY_PHASE_SUSTAINED
                        - STORY_PHASE_FADING
                    description: StoryPhase represents the lifecycle stage of a tracked news story.
            description: StoryMeta carries cross-cycle persistence data attached to each news item.
