import { supabase } from './supabase';

const API_URL = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:3001';

export const ACTIVE_TENANT_STORAGE_KEY = 'ceo-os.active-tenant';

export class ApiError extends Error {
  constructor(
    public readonly status: number,
    message: string,
  ) {
    super(message);
  }
}

interface ApiFetchOptions {
  method?: 'GET' | 'POST' | 'PATCH' | 'DELETE';
  body?: unknown;
  /** Rutele de bootstrap (/v1/me, /v1/tenants) nu trimit tenant header. */
  tenantId?: string | null;
}

/**
 * Toate apelurile catre ceo-api trec pe aici: Bearer din sesiunea Supabase,
 * tenantul activ in x-tenant-id (niciodata in body/query — TenantGuard pe
 * server respinge exact acel pattern).
 */
export async function apiFetch<T>(path: string, options: ApiFetchOptions = {}): Promise<T> {
  const { data } = await supabase.auth.getSession();
  const token = data.session?.access_token;
  if (!token) {
    throw new ApiError(401, 'Not signed in');
  }

  const headers: Record<string, string> = {
    Authorization: `Bearer ${token}`,
    'Content-Type': 'application/json',
  };
  if (options.tenantId) {
    headers['x-tenant-id'] = options.tenantId;
  }

  const response = await fetch(`${API_URL}${path}`, {
    method: options.method ?? 'GET',
    headers,
    body: options.body !== undefined ? JSON.stringify(options.body) : undefined,
  });

  if (!response.ok) {
    let message = `Request failed (${response.status})`;
    try {
      const payload = (await response.json()) as { message?: string | string[] };
      if (payload.message) {
        message = Array.isArray(payload.message) ? payload.message.join('; ') : payload.message;
      }
    } catch {
      // corpul nu e JSON — pastram mesajul generic
    }
    throw new ApiError(response.status, message);
  }

  return (await response.json()) as T;
}

// --- Tipuri aliniate la contractele ceo-api ---

export interface TenantMembership {
  tenantId: string;
  tenantName: string;
  role: 'owner' | 'admin' | 'member';
}

export interface MeResponse {
  userId: string;
  email: string | null;
  tenants: TenantMembership[];
}

export interface Organization {
  id: string;
  name: string;
  legalName: string | null;
  country: string | null;
  registryId: string | null;
  domain: string | null;
  createdAt: string;
}

export type TaskStatus = 'open' | 'in_progress' | 'blocked' | 'done' | 'cancelled';

export interface Task {
  id: string;
  title: string;
  priority: number;
  dueAt: string | null;
  status: TaskStatus;
  createdAt: string;
}

export interface TenantMember {
  userId: string;
  email: string | null;
  role: 'owner' | 'admin' | 'member';
  createdAt: string;
}

export interface CompanySearchResult {
  organization_id: string;
  organization_name: string;
  normalized_domain: string;
  hq_city: string;
  hq_country: string;
  industries: string[];
  num_current_employees: number | null;
  revenue_in_thousands: number | null;
}

export interface CompanySearchResponse {
  results: CompanySearchResult[];
  count: number;
}

export interface SavedSegment {
  id: string;
  name: string;
  query: string;
  resultLimit: number;
  createdAt: string;
}

export interface Source {
  label: string;
  url: string;
}

export interface ResearchBrief {
  id: string;
  organizationId: string;
  organizationName: string | null;
  title: string;
  summary: string;
  sources: Source[];
  createdAt: string;
}

export interface Briefing {
  generatedAt: string;
  overdueTasks: Task[];
  upcomingTasks: Task[];
  weekInReview: {
    newOrganizations: number;
    newSegments: number;
    newResearchBriefs: number;
  };
  aiExplanation: string | null;
}

export type GoalStatus = 'not_started' | 'on_track' | 'at_risk' | 'achieved' | 'abandoned';

export interface Goal {
  id: string;
  tenantId: string;
  ownerUserId: string;
  horizon: string;
  metric: string;
  target: string;
  milestones: unknown[];
  status: GoalStatus;
  createdAt: string;
  updatedAt: string;
}

export type EvidenceStatus = 'missing' | 'partial' | 'complete' | 'not_required';

export interface Transaction {
  id: string;
  tenantId: string;
  organizationId: string;
  type: string;
  /** Stored as string from DB (numeric type). */
  amountMinorUnits: string;
  currency: string;
  transactionDate: string;
  evidenceStatus: EvidenceStatus;
  source: string | null;
  createdAt: string;
  updatedAt: string;
}