// Models.swift
// Jarvis — all Codable structs matching the API contract

import Foundation
import SwiftData

// MARK: - Signal Score

struct SignalScore: Codable, Hashable {
    let total: Int
    let sourceAuthority: Int
    let freshness: Int
    let localRelevance: Int
    let crossSourceConfirmation: Int
    let topicImportance: Int

    enum CodingKeys: String, CodingKey {
        case total = "signalScore"
        case sourceAuthority, freshness, localRelevance
        case crossSourceConfirmation, topicImportance
    }
}

// MARK: - Source

struct StorySource: Codable, Hashable, Identifiable {
    let id: String
    let name: String
    let url: String
    let publishedAt: Date
    let isBreaking: Bool
}

// MARK: - Timeline Entry

struct TimelineEntry: Codable, Hashable, Identifiable {
    let articleId: String
    let source: String
    let headline: String
    let publishedAt: Date
    let isBreaking: Bool

    var id: String { articleId }
}

// MARK: - Story Summary (list view)

struct StorySummary: Codable, Identifiable, Hashable {
    let id: String
    let headline: String
    let summary: String
    let topic: String
    /// Canonical category slugs from the backend. Optional so decoding tolerates
    /// the transition while the backend rolls out `tags[]`; falls back to `topic`.
    let tags: [String]?
    let signalScore: Int
    let scoreBreakdown: ScoreBreakdown
    let sourceCount: Int
    let sources: [StorySource]
    let consensus: String?
    let conflict: String?
    let updatedAt: Date
    let createdAt: Date
}

struct ScoreBreakdown: Codable, Hashable {
    let sourceAuthority: Int
    let freshness: Int
    let localRelevance: Int
    let crossSourceConfirmation: Int
    let topicImportance: Int
}

// MARK: - Story Detail (full, with timeline)

struct StoryDetail: Codable, Identifiable {
    let id: String
    let headline: String
    let summary: String
    let topic: String
    let signalScore: Int
    let scoreBreakdown: ScoreBreakdown
    let sourceCount: Int
    let consensus: String?
    let conflict: String?
    let timeline: [TimelineEntry]
    let updatedAt: Date
    let createdAt: Date
}

// MARK: - Article (full content, for offline cache)

struct Article: Codable, Identifiable {
    let id: String
    let storyId: String
    let source: String
    let sourceUrl: String
    let headline: String
    let body: String
    let imageUrl: String?
    let author: String?
    let publishedAt: Date
}

// MARK: - Feed

struct Feed: Codable, Identifiable {
    let id: String
    let name: String
    let url: String
    let health: FeedHealth
    let pollIntervalSeconds: Int
    let failureCount: Int
    let lastFetchedAt: Date?
    let articleCountToday: Int
}

enum FeedHealth: String, Codable {
    case active, failing, dead
}

// MARK: - Server Health

struct ServerHealth: Codable {
    let status: String
    let version: String
    let storiesCount: Int
    let feedsCount: Int
    let uptime: Int
}

// MARK: - Paginated Response

struct PaginatedStories: Codable {
    let data: [StorySummary]
    let nextCursor: String?
    let hasMore: Bool
    let total: Int
}

// MARK: - WebSocket Events

enum WSEventType: String, Codable {
    case storyUpdated = "story.updated"
    case storyCreated = "story.created"
    case storyStale   = "story.stale"
    case feedHealth   = "feed.health"
    case ping, pong
}

struct WSEvent: Codable {
    let type: WSEventType
    let storyId: String?
    let feedId: String?
    let signalScore: Int?
    let sourceCount: Int?
    let headline: String?
    let topic: String?
    let health: FeedHealth?
    let failureCount: Int?
    let updatedAt: Date?
    let createdAt: Date?
}

// MARK: - SwiftData cached models

@Model
final class CachedStory {
    @Attribute(.unique) var id: String
    var headline: String
    var summary: String
    var topic: String
    /// Canonical backend tags, so offline pill filtering stays accurate.
    /// Defaulted for lightweight migration of existing cached rows.
    var tags: [String] = []
    var signalScore: Int
    var sourceCount: Int
    var consensus: String?
    var conflict: String?
    var updatedAt: Date
    /// Original publish timestamp. Defaults to updatedAt for rows cached before
    /// this field was added — SwiftData handles the automatic migration.
    var createdAt: Date = Date()
    var cachedAt: Date

    init(from summary: StorySummary) {
        self.id = summary.id
        self.headline = summary.headline
        self.summary = summary.summary
        self.topic = summary.topic
        self.tags = summary.tags ?? []
        self.signalScore = summary.signalScore
        self.sourceCount = summary.sourceCount
        self.consensus = summary.consensus
        self.conflict = summary.conflict
        self.updatedAt = summary.updatedAt
        self.createdAt = summary.createdAt
        self.cachedAt = Date()
    }
}

@Model
final class ReadStory {
    @Attribute(.unique) var id: String
    var readAt: Date

    init(id: String) {
        self.id = id
        self.readAt = Date()
    }
}

@Model
final class SavedStory {
    @Attribute(.unique) var id: String
    var savedAt: Date

    init(id: String) {
        self.id = id
        self.savedAt = Date()
    }
}

@Model
final class SeenStory {
    @Attribute(.unique) var id: String
    var seenAt: Date

    init(id: String) {
        self.id = id
        self.seenAt = Date()
    }
}

@Model
final class CachedArticle {
    @Attribute(.unique) var id: String
    var storyId: String
    var source: String
    var headline: String
    var body: String
    var imageUrl: String?
    var author: String?
    var publishedAt: Date
    var cachedAt: Date

    init(from article: Article) {
        self.id = article.id
        self.storyId = article.storyId
        self.source = article.source
        self.headline = article.headline
        self.body = article.body
        self.imageUrl = article.imageUrl
        self.author = article.author
        self.publishedAt = article.publishedAt
        self.cachedAt = Date()
    }
}