/**
 * Payment actions composable — agent-facing payment operations via targo-hub
 */
import { ref } from 'vue'
import { Notify } from 'quasar'
import { HUB_SSE_URL } from 'src/config/dispatch'

const HUB = HUB_SSE_URL

async function hubFetch (path, opts = {}) {
  const res = await fetch(HUB + path, {
    method: opts.method || 'GET',
    headers: { 'Content-Type': 'application/json', ...opts.headers },
    ...(opts.body ? { body: JSON.stringify(opts.body) } : {}),
  })
  if (!res.ok) {
    const err = await res.json().catch(() => ({ error: 'Request failed' }))
    throw new Error(err.error || `HTTP ${res.status}`)
  }
  return res.json()
}

export function usePaymentActions (customer) {
  const loading = ref(false)
  const sendingLink = ref(false)
  const chargingCard = ref(false)
  const togglingPpa = ref(false)

  async function fetchBalance () {
    if (!customer.value?.name) return null
    try {
      return await hubFetch(`/payments/balance/${encodeURIComponent(customer.value.name)}`)
    } catch (e) {
      console.error('Balance fetch error:', e)
      return null
    }
  }

  async function fetchMethods () {
    if (!customer.value?.name) return []
    try {
      const res = await hubFetch(`/payments/methods/${encodeURIComponent(customer.value.name)}`)
      return res.methods || []
    } catch (e) {
      console.error('Methods fetch error:', e)
      return []
    }
  }

  async function sendPaymentLink (channel = 'both') {
    sendingLink.value = true
    try {
      const res = await hubFetch('/payments/send-link', {
        method: 'POST',
        body: { customer: customer.value.name, channel },
      })
      const sentVia = res.sent?.join(' + ') || 'aucun'
      Notify.create({ type: 'positive', message: `Lien de paiement envoyé (${sentVia}) — ${res.amount}$`, position: 'top' })
      return res
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur: ${e.message}`, position: 'top' })
    } finally {
      sendingLink.value = false
    }
  }

  async function chargeCard (amount) {
    chargingCard.value = true
    try {
      const res = await hubFetch('/payments/charge', {
        method: 'POST',
        body: { customer: customer.value.name, ...(amount ? { amount } : {}) },
      })
      if (res.ok) {
        Notify.create({ type: 'positive', message: `Paiement de ${res.amount}$ prélevé avec succès`, position: 'top' })
      } else {
        Notify.create({ type: 'warning', message: `Statut: ${res.status} — vérifier Stripe`, position: 'top' })
      }
      return res
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur prélèvement: ${e.message}`, position: 'top' })
    } finally {
      chargingCard.value = false
    }
  }

  async function togglePpa (enabled) {
    togglingPpa.value = true
    try {
      await hubFetch('/payments/toggle-ppa', {
        method: 'POST',
        body: { customer: customer.value.name, enabled },
      })
      Notify.create({
        type: 'positive',
        message: enabled ? 'PPA activé' : 'PPA désactivé',
        position: 'top',
      })
      return true
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur PPA: ${e.message}`, position: 'top' })
      return false
    } finally {
      togglingPpa.value = false
    }
  }

  async function openPortal () {
    loading.value = true
    try {
      const res = await hubFetch('/payments/portal', {
        method: 'POST',
        body: { customer: customer.value.name },
      })
      if (res.url) window.open(res.url, '_blank')
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur: ${e.message}`, position: 'top' })
    } finally {
      loading.value = false
    }
  }

  async function createCheckout () {
    loading.value = true
    try {
      const res = await hubFetch('/payments/checkout', {
        method: 'POST',
        body: { customer: customer.value.name },
      })
      // Copy URL to clipboard for the agent to share
      if (res.url) {
        await navigator.clipboard?.writeText(res.url)
        Notify.create({ type: 'info', message: `Lien copié — ${res.amount}$. Ouvre dans un nouvel onglet.`, position: 'top', timeout: 4000 })
        window.open(res.url, '_blank')
      }
      return res
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur: ${e.message}`, position: 'top' })
    } finally {
      loading.value = false
    }
  }

  const refunding = ref(false)

  async function refundPayment (paymentEntry, amount, reason) {
    refunding.value = true
    try {
      const res = await hubFetch('/payments/refund', {
        method: 'POST',
        body: { payment_entry: paymentEntry, amount: amount || undefined, reason },
      })
      if (res.ok) {
        const msg = res.stripe_refund
          ? `Remboursement Stripe ${res.amount}$ (${res.stripe_refund.id})`
          : `Remboursement ${res.amount}$ enregistré`
        Notify.create({ type: 'positive', message: msg, position: 'top' })
        if (res.warning) {
          Notify.create({ type: 'warning', message: res.warning, position: 'top', timeout: 8000 })
        }
      }
      return res
    } catch (e) {
      Notify.create({ type: 'negative', message: `Erreur remboursement: ${e.message}`, position: 'top' })
    } finally {
      refunding.value = false
    }
  }

  return {
    loading, sendingLink, chargingCard, togglingPpa, refunding,
    fetchBalance, fetchMethods,
    sendPaymentLink, chargeCard, togglePpa, openPortal, createCheckout,
    refundPayment,
  }
}