// ============================================================================
// API Types - Generated from API_DOCUMENTATION.md
// ============================================================================

// ----------------------------------------------------------------------------
// User & Auth
// ----------------------------------------------------------------------------

export interface User {
  id: string;
  telegram_id: number;
  username: string | null;
  first_name: string;
  last_name: string | null;
  created_at: string; // ISO 8601
}

export interface AuthInitResponse {
  bot_username: string;
  start_param: string; // "login"
}

export interface AuthCompleteRequest {
  token: string; // one-time token from bot
}

export interface AuthCompleteResponse {
  access_token: string;
  refresh_token: string;
  user: User;
}

export interface AuthRefreshRequest {
  refresh_token: string;
}

export interface AuthRefreshResponse {
  access_token: string;
}

// ----------------------------------------------------------------------------
// Target Channel
// ----------------------------------------------------------------------------

export interface TargetChannel {
  id: string;
  telegram_id: number;
  title: string;
  username: string | null; // @channel_name
  description: string | null;
  is_active: boolean;
  created_at: string;
  updated_at: string;
  // Stats
  total_purchases: number;
  total_subscriptions: number;
  avg_cpf: number | null; // Average Cost Per Follower
}

export interface TargetChannelDetail extends TargetChannel {
  recent_purchases: Purchase[]; // last 5
  stats_by_period: {
    period: "day" | "week" | "month";
    subscriptions: number;
    cost: number;
    cpf: number;
  }[];
}

export interface TargetChannelUpdateRequest {
  is_active: boolean;
}

// ----------------------------------------------------------------------------
// External Channel
// ----------------------------------------------------------------------------

export interface ExternalChannel {
  id: string;
  telegram_id: number | null;
  title: string;
  username: string | null;
  link: string; // t.me link or custom
  subscribers_count: number | null;
  description: string | null;
  created_at: string;
  updated_at: string;
  // Relations
  target_channels: string[]; // IDs of target channels
  // Stats
  total_purchases: number;
  avg_cpf: number | null;
  avg_cpm: number | null;
}

export interface ExternalChannelDetail extends ExternalChannel {
  purchases: Purchase[];
}

export interface ExternalChannelCreateRequest {
  title: string;
  username?: string;
  link: string;
  subscribers_count?: number;
  description?: string;
  target_channel_ids: string[]; // Привязка к целевым каналам
}

export interface ExternalChannelUpdateRequest {
  title?: string;
  username?: string;
  link?: string;
  subscribers_count?: number;
  description?: string;
  target_channel_ids?: string[];
}

export interface ExternalChannelImportResponse {
  imported: number;
  skipped: number;
  errors: string[];
  channels: ExternalChannel[];
}

// ----------------------------------------------------------------------------
// Creative
// ----------------------------------------------------------------------------

export interface Creative {
  id: string;
  name: string;
  text: string; // Template with {link} placeholder
  target_channel_id: string;
  is_archived: boolean;
  created_at: string;
  updated_at: string;
  // Relations
  target_channel: TargetChannel;
  // Stats
  total_purchases: number;
  total_subscriptions: number;
  avg_cpf: number | null;
}

export interface CreativeDetail extends Creative {
  purchases: Purchase[];
}

export interface CreativeCreateRequest {
  name: string;
  text: string; // Must contain {link} placeholder
  target_channel_id: string;
}

export interface CreativeUpdateRequest {
  name?: string;
  text?: string;
  is_archived?: boolean;
}

// ----------------------------------------------------------------------------
// Purchase
// ----------------------------------------------------------------------------

export type InviteLinkType = "public" | "private";

export interface Purchase {
  id: string;
  target_channel_id: string;
  external_channel_id: string;
  creative_id: string;
  // Purchase details
  scheduled_date: string | null; // ISO 8601
  actual_date: string | null;
  cost: number | null; // in rubles
  comment: string | null;
  post_link: string | null; // Link to ad post in external channel
  invite_link: string; // Generated invite link
  invite_link_type: InviteLinkType; // with bot approval or not
  is_archived: boolean;
  created_at: string;
  updated_at: string;
  // Relations
  target_channel: TargetChannel;
  external_channel: ExternalChannel;
  creative: Creative;
  // Stats
  subscriptions_count: number;
  views_count: number | null;
  cpf: number | null; // Cost Per Follower
  cpm: number | null; // Cost Per Mile (1000 views)
  conversion_rate: number | null; // subscriptions / views * 100
}

export interface PurchaseDetail extends Purchase {
  subscriptions: Subscription[];
  views_history: ViewsSnapshot[];
}

export interface PurchaseCreateRequest {
  target_channel_id: string;
  external_channel_id: string;
  creative_id: string;
  scheduled_date?: string;
  actual_date?: string;
  cost?: number;
  comment?: string;
  post_link?: string;
  invite_link_type: InviteLinkType;
}

export interface PurchaseCreateResponse extends Purchase {
  formatted_message: string; // Creative text with invite_link inserted
}

export interface PurchaseUpdateRequest {
  scheduled_date?: string;
  actual_date?: string;
  cost?: number;
  comment?: string;
  post_link?: string;
  is_archived?: boolean;
}

export interface PurchaseRefreshViewsResponse {
  views: number;
  fetched_at: string;
}

// ----------------------------------------------------------------------------
// Subscription
// ----------------------------------------------------------------------------

export interface Subscription {
  id: string;
  purchase_id: string;
  telegram_user_id: number;
  user_first_name: string;
  user_last_name: string | null;
  user_username: string | null;
  subscribed_at: string; // ISO 8601
  is_active: boolean;
  event_type: "chat_member" | "join_request";
}

// ----------------------------------------------------------------------------
// Views Snapshot
// ----------------------------------------------------------------------------

export interface ViewsSnapshot {
  id: string;
  purchase_id: string;
  views: number;
  fetched_at: string; // ISO 8601
}

// ----------------------------------------------------------------------------
// Analytics
// ----------------------------------------------------------------------------

export interface AnalyticsOverview {
  totalPurchases: number;
  purchasesChange: number;
  totalFollowers: number;
  followersChange: number;
  averageCpf: number;
  cpfChange: number;
  averageCpm: number;
  cpmChange: number;
  topChannelsByCpf: {
    channel_id: string;
    channel_name: string;
    total_purchases: number;
    avg_cpf: number;
  }[];
  topCreativesByCpf: {
    creative_id: string;
    creative_name: string;
    total_subscriptions: number;
    avg_cpf: number;
  }[];
}

export type GroupByPeriod = "day" | "week" | "month" | "quarter" | "year";

export interface AnalyticsCostsDataPoint {
  period: string; // ISO 8601 date (start of period)
  cost: number;
  purchases_count: number;
  subscriptions: number;
}

export interface AnalyticsCostsResponse {
  data: AnalyticsCostsDataPoint[];
}

export interface CostsReport {
  totalCost: number;
  averageCost: number;
  periods: {
    date: string;
    total_cost: number;
    purchases_count: number;
    avg_cost: number;
  }[];
}

export interface AnalyticsChannelData {
  channel_id: string;
  channel_name: string;
  purchases_count: number;
  total_cost: number;
  total_subscriptions: number;
  avg_cpf: number;
  avg_cpm: number;
}

export interface AnalyticsChannelsResponse {
  data: AnalyticsChannelData[];
}

export interface AnalyticsCreativeData {
  creative_id: string;
  creative_name: string;
  purchases_count: number;
  total_cost: number;
  total_subscriptions: number;
  avg_cpf: number;
  conversion_rate: number;
}

export interface AnalyticsCreativesResponse {
  data: AnalyticsCreativeData[];
}

// ----------------------------------------------------------------------------
// Common API Responses
// ----------------------------------------------------------------------------

export interface ListResponse<T> {
  data: T[];
  total: number;
}

export interface SuccessResponse {
  success: boolean;
}

export interface ApiError {
  error: {
    code: string;
    message: string;
    details?: any;
  };
}

// ----------------------------------------------------------------------------
// Query Parameters
// ----------------------------------------------------------------------------

export interface TargetChannelQueryParams {
  is_active?: boolean;
}

export interface ExternalChannelQueryParams {
  target_channel_id?: string;
  search?: string;
}

export interface CreativeQueryParams {
  target_channel_id?: string;
  is_archived?: boolean;
}

export interface PurchaseQueryParams {
  target_channel_id?: string;
  external_channel_id?: string;
  creative_id?: string;
  is_archived?: boolean;
  date_from?: string; // ISO 8601
  date_to?: string; // ISO 8601
  sort?: "date" | "cost" | "cpf" | "subscriptions";
  order?: "asc" | "desc";
}

export interface AnalyticsOverviewQueryParams {
  target_channel_id?: string;
  date_from?: string;
  date_to?: string;
}

export interface AnalyticsCostsQueryParams {
  target_channel_id?: string;
  date_from: string; // required
  date_to: string; // required
  group_by: GroupByPeriod;
}

export interface AnalyticsChannelsQueryParams {
  target_channel_id?: string;
  date_from?: string;
  date_to?: string;
  type: "external" | "target";
}

export interface AnalyticsCreativesQueryParams {
  target_channel_id?: string;
  date_from?: string;
  date_to?: string;
}