import { Hono } from 'hono'
import { nanoid } from 'nanoid'
import { db, schema } from '../db/index.js'
import { eq } from 'drizzle-orm'
import { createEntryInvoice, checkPaymentStatus, redeemCashuToken } from '../engine/payments.js'
import { encrypt, decrypt } from '../engine/crypto.js'
import { rateLimit } from '../middleware/rate-limit.js'

export const paymentsRouter = new Hono()

// POST /connect-wallet
paymentsRouter.post('/connect-wallet', async (c) => {
  const { pubkey, method, connectionData } = await c.req.json<{
    pubkey: string
    method: 'nwc' | 'lnaddress' | 'cashu_mint'
    connectionData: string
  }>()

  if (!pubkey || !method || !connectionData) {
    return c.json({ error: 'Missing pubkey, method, or connectionData' }, 400)
  }

  // Look up bot by publicKey
  const botRows = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (botRows.length === 0) {
    return c.json({ error: 'Bot not found for this public key' }, 404)
  }

  const botId = botRows[0].id
  const encryptedData = encrypt(connectionData)
  const now = new Date().toISOString()

  // Upsert wallet connection
  const existing = await db.select({ id: schema.walletConnections.id })
    .from(schema.walletConnections)
    .where(eq(schema.walletConnections.botId, botId))
    .limit(1)

  if (existing.length > 0) {
    await db.update(schema.walletConnections).set({
      method,
      connectionData: encryptedData,
      lastUsedAt: now,
    }).where(eq(schema.walletConnections.botId, botId))
  } else {
    await db.insert(schema.walletConnections).values({
      id: nanoid(12),
      botId,
      method,
      connectionData: encryptedData,
      createdAt: now,
    })
  }

  await db.update(schema.bots).set({ hasWallet: true }).where(eq(schema.bots.id, botId))

  return c.json({ success: true })
})

// GET /wallet-status
paymentsRouter.get('/wallet-status', async (c) => {
  const pubkey = c.req.query('pubkey')
  if (!pubkey) return c.json({ connected: false, method: null })

  const botRows = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (botRows.length === 0) return c.json({ connected: false, method: null })

  const walletRows = await db.select({ method: schema.walletConnections.method })
    .from(schema.walletConnections)
    .where(eq(schema.walletConnections.botId, botRows[0].id))
    .limit(1)

  if (walletRows.length === 0) return c.json({ connected: false, method: null })

  return c.json({ connected: true, method: walletRows[0].method })
})

// POST /create-invoice — rate limited: 10 per minute per IP
paymentsRouter.post('/create-invoice', rateLimit(60_000, 10), async (c) => {
  const { botId, pubkey } = await c.req.json<{ botId: string; pubkey?: string }>()
  if (!botId) return c.json({ error: 'Missing botId' }, 400)

  // In production, verify bot ownership
  if (process.env.NODE_ENV === 'production') {
    if (!pubkey || typeof pubkey !== 'string' || pubkey.length !== 64) {
      return c.json({ error: 'Missing pubkey' }, 400)
    }
    const botRows = await db.select({ publicKey: schema.bots.publicKey })
      .from(schema.bots).where(eq(schema.bots.id, botId)).limit(1)
    if (botRows.length === 0 || botRows[0].publicKey !== pubkey) {
      return c.json({ error: 'Unauthorized' }, 403)
    }
  }

  try {
    const result = await createEntryInvoice(botId)
    return c.json(result)
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Invoice creation failed'
    return c.json({ error: message }, 500)
  }
})

// GET /check/:paymentId — rate limited: 30 per minute per IP
paymentsRouter.get('/check/:paymentId', rateLimit(60_000, 30), async (c) => {
  const paymentId = c.req.param('paymentId')
  if (!paymentId || paymentId.length > 24) {
    return c.json({ error: 'Invalid paymentId' }, 400)
  }
  try {
    const status = await checkPaymentStatus(paymentId)
    return c.json({ status })
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Status check failed'
    return c.json({ error: message }, 500)
  }
})

// POST /confirm/:paymentId — frontend confirms after NWC pay returns preimage
paymentsRouter.post('/confirm/:paymentId', rateLimit(60_000, 20), async (c) => {
  const paymentId = c.req.param('paymentId')
  if (!paymentId || paymentId.length > 24) {
    return c.json({ error: 'Invalid paymentId' }, 400)
  }

  const { preimage, pubkey } = await c.req.json<{ preimage?: string; pubkey?: string }>().catch(() => ({ preimage: undefined, pubkey: undefined }))

  const rows = await db.select().from(schema.payments)
    .where(eq(schema.payments.id, paymentId)).limit(1)
  if (rows.length === 0) return c.json({ error: 'Payment not found' }, 404)

  const payment = rows[0]
  if (payment.status === 'confirmed') return c.json({ status: 'confirmed' })
  if (payment.status !== 'pending') return c.json({ error: 'Payment is not pending' }, 400)

  // Must be an inbound entry payment
  if (payment.direction !== 'in') return c.json({ error: 'Cannot confirm outbound payments' }, 400)

  // Verify caller owns this payment's bot
  if (pubkey && typeof pubkey === 'string' && pubkey.length === 64) {
    const botRows = await db.select({ publicKey: schema.bots.publicKey })
      .from(schema.bots).where(eq(schema.bots.id, payment.botId)).limit(1)
    if (botRows.length === 0 || botRows[0].publicKey !== pubkey) {
      return c.json({ error: 'Unauthorized' }, 403)
    }
  } else if (process.env.NODE_ENV === 'production') {
    return c.json({ error: 'Missing or invalid pubkey' }, 400)
  }

  // In production, also verify payment via NWC lookup (belt and suspenders)
  if (process.env.NODE_ENV === 'production' && payment.invoice && payment.invoice !== 'dev_auto_confirmed') {
    try {
      const serverStatus = await checkPaymentStatus(paymentId)
      if (serverStatus !== 'confirmed') {
        return c.json({ error: 'Server could not verify payment. Try again.' }, 402)
      }
      // checkPaymentStatus already updated the DB
      return c.json({ status: 'confirmed' })
    } catch {
      // NWC check failed — fall through to client-confirmed path with preimage
      if (!preimage) {
        return c.json({ error: 'Payment verification failed and no preimage provided.' }, 402)
      }
    }
  }

  await db.update(schema.payments).set({
    status: 'confirmed',
    preimage: preimage || null,
    confirmedAt: new Date().toISOString(),
  }).where(eq(schema.payments.id, paymentId))

  console.log(`[payments] payment ${paymentId} confirmed via client (preimage: ${preimage ? 'yes' : 'no'})`)
  return c.json({ status: 'confirmed' })
})

// POST /submit-cashu
paymentsRouter.post('/submit-cashu', async (c) => {
  const { botId, token } = await c.req.json<{ botId: string; token: string }>()
  if (!botId || !token) return c.json({ error: 'Missing botId or token' }, 400)

  try {
    const result = await redeemCashuToken(token, botId)
    return c.json({
      paymentId: result.paymentId,
      status: result.valid ? 'confirmed' : 'failed',
    })
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Cashu redemption failed'
    return c.json({ error: message }, 500)
  }
})

// GET /winnings/:botId
paymentsRouter.get('/winnings/:botId', async (c) => {
  const botId = c.req.param('botId')

  const unclaimed = await db.select({
    paymentId: schema.payments.id,
    cashuToken: schema.payments.cashuToken,
    amountSats: schema.payments.amountSats,
  }).from(schema.payments)
    .where(eq(schema.payments.botId, botId))

  // Filter in JS since drizzle doesn't easily combine multiple conditions
  const filtered = unclaimed.filter(p => p.cashuToken)

  return c.json({ unclaimed: filtered })
})

// POST /claim/:paymentId
paymentsRouter.post('/claim/:paymentId', async (c) => {
  const paymentId = c.req.param('paymentId')
  const { pubkey } = await c.req.json<{ pubkey?: string }>().catch(() => ({ pubkey: undefined }))

  const rows = await db.select().from(schema.payments)
    .where(eq(schema.payments.id, paymentId))
    .limit(1)

  if (rows.length === 0) return c.json({ error: 'Payment not found' }, 404)

  const payment = rows[0]

  // Verify caller owns this payment's bot
  if (pubkey) {
    const botRows = await db.select({ publicKey: schema.bots.publicKey })
      .from(schema.bots).where(eq(schema.bots.id, payment.botId)).limit(1)
    if (botRows.length === 0 || botRows[0].publicKey !== pubkey) {
      return c.json({ error: 'Unauthorized' }, 403)
    }
  } else if (process.env.NODE_ENV === 'production') {
    return c.json({ error: 'Missing pubkey' }, 400)
  }

  if (!payment.cashuToken) return c.json({ error: 'No Cashu token to claim' }, 400)

  // Clear the token from DB after claiming
  await db.update(schema.payments).set({ cashuToken: null })
    .where(eq(schema.payments.id, paymentId))

  return c.json({ cashuToken: payment.cashuToken })
})

// DELETE /disconnect-wallet
paymentsRouter.delete('/disconnect-wallet', async (c) => {
  const { pubkey } = await c.req.json<{ pubkey: string }>()
  if (!pubkey) return c.json({ error: 'Missing pubkey' }, 400)

  const botRows = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (botRows.length === 0) return c.json({ error: 'Bot not found' }, 404)

  const botId = botRows[0].id

  await db.delete(schema.walletConnections)
    .where(eq(schema.walletConnections.botId, botId))

  await db.update(schema.bots).set({ hasWallet: false })
    .where(eq(schema.bots.id, botId))

  return c.json({ success: true })
})

// POST /zap — zap sats to a fight winner
paymentsRouter.post('/zap', rateLimit(60_000, 10), async (c) => {
  const { winnerId, fightId, amountSats } = await c.req.json<{
    winnerId: string
    fightId: string
    amountSats: number
  }>()

  if (!winnerId || !fightId) return c.json({ error: 'Missing winnerId or fightId' }, 400)
  const amount = amountSats || 21

  // Verify the fight exists and this bot actually won
  const fightRows = await db.select({
    winnerId: schema.fights.winnerId,
    status: schema.fights.status,
  }).from(schema.fights).where(eq(schema.fights.id, fightId)).limit(1)

  if (fightRows.length === 0) return c.json({ error: 'Fight not found' }, 404)
  if (fightRows[0].status !== 'finished') return c.json({ error: 'Fight not finished' }, 400)
  if (fightRows[0].winnerId !== winnerId) return c.json({ error: 'Bot did not win this fight' }, 400)

  // Increment zaps on the winner
  const botRows = await db.select({ zapsReceived: schema.bots.zapsReceived })
    .from(schema.bots).where(eq(schema.bots.id, winnerId)).limit(1)
  if (botRows.length === 0) return c.json({ error: 'Bot not found' }, 404)

  await db.update(schema.bots).set({
    zapsReceived: (botRows[0].zapsReceived || 0) + 1,
  }).where(eq(schema.bots.id, winnerId))

  return c.json({ ok: true, zapsReceived: (botRows[0].zapsReceived || 0) + 1 })
})