/**
 * Support Tickets — composable for queue state, filtering, CRUD, and mock routing.
 * Persisted in localStorage via useLocalStorageRef.
 */
import { useLocalStorageRef } from '~/utils/useLocalStorageRef'
import {
  type SupportTicket,
  type SupportTicketDetail,
  type TicketMessage,
  type TicketStatus,
  type SupportChannel,
  type RoutingTier,
  type RoutedQueue,
  type RoutingRule,
  MOCK_SUPPORT_TICKETS,
  MOCK_TICKET_DETAILS,
  MOCK_ROUTING_RULES,
} from '~/data/mock-support'

interface SupportState {
  tickets: SupportTicket[]
  details: Record<string, SupportTicketDetail>
  routingRules: RoutingRule[]
}

function buildDefaults(): SupportState {
  return {
    tickets: [...MOCK_SUPPORT_TICKETS],
    details: { ...MOCK_TICKET_DETAILS },
    routingRules: [...MOCK_ROUTING_RULES],
  }
}

export function useSupportTickets() {
  const state = useLocalStorageRef<SupportState>('policy-ui-support-tickets-v1', buildDefaults)

  // ── Computed: filtered lists ──
  const openTickets = computed(() => state.value.tickets.filter(t => t.status === 'open'))
  const unresolvedCount = computed(() => state.value.tickets.filter(t => t.status !== 'resolved').length)
  const breachedCount = computed(() => state.value.tickets.filter(t => t.slaPercent >= 100).length)
  const unassignedCount = computed(() => state.value.tickets.filter(t => !t.assignedTo).length)
  const openPoolCount = computed(() => state.value.tickets.filter(t => t.routedQueue === 'open_pool').length)
  const inProgressCount = computed(() => state.value.tickets.filter(t => t.status === 'in_progress').length)

  const kpis = computed(() => {
    const all = state.value.tickets
    const unresolved = all.filter(t => t.status !== 'resolved')
    const avgDaysOpen = unresolved.length
      ? Math.round(unresolved.reduce((sum, t) => sum + t.daysOpen, 0) / unresolved.length)
      : 0
    return {
      total: all.length,
      open: openTickets.value.length,
      inProgress: inProgressCount.value,
      breached: breachedCount.value,
      avgDaysOpen,
      unassigned: unassignedCount.value,
      openPool: openPoolCount.value,
    }
  })

  // ── CRUD ──
  function updateStatus(ticketId: string, status: TicketStatus) {
    const ticket = state.value.tickets.find(t => t.id === ticketId)
    if (ticket) {
      ticket.status = status
      ticket.updatedAt = new Date().toISOString().slice(0, 10)
    }
    const detail = state.value.details[ticketId]
    if (detail) {
      detail.status = status
      detail.updatedAt = new Date().toISOString().slice(0, 10)
    }
  }

  function assignTicket(ticketId: string, agent: string) {
    const ticket = state.value.tickets.find(t => t.id === ticketId)
    if (ticket) {
      ticket.assignedTo = agent
      ticket.updatedAt = new Date().toISOString().slice(0, 10)
    }
    const detail = state.value.details[ticketId]
    if (detail) {
      detail.assignedTo = agent
      detail.updatedAt = new Date().toISOString().slice(0, 10)
      detail.messages.push({
        id: `msg-${Date.now()}`,
        type: 'system',
        direction: 'internal',
        from: 'Sistema',
        to: null,
        subject: null,
        body: `Ticket asignado a ${agent}`,
        timestamp: new Date().toISOString(),
        aiDigest: null,
      })
    }
  }

  function addMessage(ticketId: string, message: Omit<TicketMessage, 'id' | 'timestamp'>) {
    const detail = state.value.details[ticketId]
    if (!detail) return
    const msg: TicketMessage = {
      ...message,
      id: `msg-${Date.now()}`,
      timestamp: new Date().toISOString(),
    }
    detail.messages.push(msg)
    detail.messageCount = detail.messages.length
    detail.updatedAt = new Date().toISOString().slice(0, 10)
    detail.lastMessagePreview = msg.body.slice(0, 80)

    // sync summary ticket
    const ticket = state.value.tickets.find(t => t.id === ticketId)
    if (ticket) {
      ticket.messageCount = detail.messageCount
      ticket.updatedAt = detail.updatedAt
      ticket.lastMessagePreview = detail.lastMessagePreview
    }
  }

  // ── Mock Routing ──
  const routingKeywords: Record<RoutedQueue, string[]> = {
    collections: ['pago', 'factura', 'cobro', 'recibo', 'transferencia', 'mora'],
    claims: ['siniestro', 'accidente', 'robo', 'daño', 'choque', 'grúa', 'colisión'],
    sales: ['cotización', 'seguro nuevo', 'precio', 'cuánto sale', 'cobertura'],
    renewals: ['renovación', 'vencimiento', 'prórroga', 'vigencia'],
    operations: ['endoso', 'certificado', 'modificar', 'cambio de beneficiario'],
    open_pool: [],
  }

  function simulateRouting(channel: SupportChannel, body: string): { tier: RoutingTier; queue: RoutedQueue; confidence: number } {
    const lower = body.toLowerCase()

    // Tier 2: keyword matching
    for (const [queue, keywords] of Object.entries(routingKeywords) as [RoutedQueue, string[]][]) {
      if (!keywords.length) continue
      const matched = keywords.filter(kw => lower.includes(kw))
      if (matched.length > 0) {
        const confidence = Math.min(0.95, 0.6 + matched.length * 0.1)
        return { tier: 'tier2_rule', queue, confidence }
      }
    }

    // Tier 3: no match → open pool
    return { tier: 'tier3_open', queue: 'open_pool', confidence: 0.3 }
  }

  // ── Routing Rules CRUD ──
  function toggleRule(ruleId: string) {
    const rule = state.value.routingRules.find(r => r.id === ruleId)
    if (rule) rule.enabled = !rule.enabled
  }

  function updateRule(ruleId: string, updates: Partial<RoutingRule>) {
    const rule = state.value.routingRules.find(r => r.id === ruleId)
    if (rule) Object.assign(rule, updates)
  }

  function getDetail(ticketId: string): SupportTicketDetail | undefined {
    return state.value.details[ticketId]
  }

  return {
    state,
    // computed
    openTickets,
    unresolvedCount,
    breachedCount,
    unassignedCount,
    openPoolCount,
    inProgressCount,
    kpis,
    // CRUD
    updateStatus,
    assignTicket,
    addMessage,
    getDetail,
    // routing
    simulateRouting,
    toggleRule,
    updateRule,
  }
}