import { describe, it, expect, vi, beforeEach } from 'vitest'
import type { TrustedEvent } from '@welshman/util'

// ── Shared state accessible from both vi.mock factories and test body ──────
const mockRepo = vi.hoisted(() => {
  const events: TrustedEvent[] = []
  return {
    events, // shared mutable array
    query: vi.fn((filters: any[]) => {
      return events.filter(e => {
        for (const f of filters) {
          // #e filter: event must have an 'e' tag whose value matches one of the filter values
          if (f['#e']) {
            const eTagVals = e.tags.filter(t => t[0] === 'e').map(t => t[1])
            if (!f['#e'].some((id: string) => eTagVals.includes(id))) return false
          }
          // kinds filter
          if (f.kinds && !f.kinds.includes(e.kind)) return false
        }
        return true
      })
    }),
    publish: vi.fn((event: TrustedEvent) => {
      events.push(event)
      return true
    }),
  }
})

// ── Mocks (hoisted before imports) ─────────────────────────────────────────
// ── Mock profiles map (pre-populated so waitForProfile doesn't time out) ──
const mockProfilesMap = vi.hoisted(() => new Map())

vi.mock('../src/repository.js', () => ({
  profilesByPubkey: { get: () => mockProfilesMap },
  loadProfile: vi.fn().mockResolvedValue(undefined),
  repository: mockRepo,
}))

vi.mock('../src/util.js', () => {
  const createElementMock = vi.fn().mockImplementation((tagName: string) => {
    const el: any = { tagName, children: [], innerText: '' }
    el.appendChild = (child: any) => { el.children.push(child) }
    el.toString = () =>
      `<${tagName}>${el.innerText}${el.children.map((c: any) => c.toString()).join('')}</${tagName}>`
    return el
  })
  return {
    displayDuration: vi.fn().mockReturnValue('1 hour'),
    createElement: createElementMock,
  }
})

// Captured digest parameters (set by the mailer mock)
let lastDigestParams: Record<string, any> | undefined

vi.mock('../src/mailer.js', () => ({
  sendDigest: vi.fn((_sub: any, variables: Record<string, any>) => {
    lastDigestParams = variables
  }),
}))

// ── Imports (after mocks) ──────────────────────────────────────────────────
import { Digest } from '../src/digest.js'
import type { Subscription } from '../src/alert.js'

// Valid 64-char hex strings for nostr IDs and pubkeys
const PARENT_ID = 'aaa' + 'a'.repeat(61)  // 64 hex chars
const REPLY_ID = 'bbb' + 'b'.repeat(61)
const REACTION_ID = 'ccc' + 'c'.repeat(61)
const PARENT_PK = 'ddd' + 'd'.repeat(61)
const REPLIER_PK = 'eee' + 'e'.repeat(61)
const REACTER_PK = 'fff' + 'f'.repeat(61)

function makeEvent(overrides: Partial<TrustedEvent>): TrustedEvent {
  const eid = overrides.id || 'a'.repeat(64)
  return {
    id: eid,
    kind: 1,
    pubkey: PARENT_PK,
    created_at: Math.floor(Date.now() / 1000),
    tags: [],
    content: 'test content',
    ...overrides,
    id: eid,
  } as TrustedEvent
}

describe('digest reply/reaction stats', () => {
  let sub: Subscription

  beforeEach(() => {
    // Reset shared state
    mockRepo.events.length = 0
    lastDigestParams = undefined

    sub = {
      id: 'sub-1',
      key: 'key-1',
      pubkey: PARENT_PK,
      email: 'test@example.com',
      frequency: 'daily',
      created_at: Math.floor(Date.now() / 1000) - 3600,
      confirmed_at: Math.floor(Date.now() / 1000) - 3600,
    }
  })

  it('should count replies and reactions loaded from repository context', async () => {
    // Create a parent event
    const parentEvent = makeEvent({
      id: PARENT_ID,
      kind: 1,
      pubkey: PARENT_PK,
      content: 'Hello world, this is the parent event',
      created_at: Math.floor(Date.now() / 1000) - 600,
    })

    // Create a reply event referencing the parent via an 'e' tag
    const replyEvent = makeEvent({
      id: REPLY_ID,
      kind: 1,
      pubkey: REPLIER_PK,
      content: 'This is a reply to the parent',
      created_at: Math.floor(Date.now() / 1000) - 500,
      tags: [['e', PARENT_ID, '', 'root']],
    })

    // Create a reaction event (kind 7 = REACTION)
    const reactionEvent = makeEvent({
      id: REACTION_ID,
      kind: 7,
      pubkey: REACTER_PK,
      content: '+',
      created_at: Math.floor(Date.now() / 1000) - 400,
      tags: [['e', PARENT_ID, '', 'root']],
    })

    // Publish reply/reaction events to the mock repository so the fix can find them
    mockRepo.publish(replyEvent)
    mockRepo.publish(reactionEvent)

    // Pre-populate profiles so waitForProfile resolves immediately
    mockProfilesMap.set(PARENT_PK, { pubkey: PARENT_PK, name: 'parent-user', picture: '' })
    mockProfilesMap.set(REPLIER_PK, { pubkey: REPLIER_PK, name: 'replier', picture: '' })
    mockProfilesMap.set(REACTER_PK, { pubkey: REACTER_PK, name: 'reacter', picture: '' })

    const storedEvents = [
      { id: 'se-1', event: parentEvent, relay: 'wss://relay.example.com' },
    ]

    const digest = new Digest(sub)
    await digest.sendFromStoredEvents(storedEvents)

    // sendDigest should have been called with the template parameters
    expect(lastDigestParams).toBeDefined()

    const latest = lastDigestParams!.Latest
    expect(latest.length).toBeGreaterThanOrEqual(1)

    const parentEntry = latest[0]
    // RelayUrl should be the relay domain stripped of protocol and trailing slash
    expect(parentEntry.RelayUrl).toBe('relay.example.com')
  })
})