import { z } from 'zod'
import { FlightDetailStatus, VisaStatus } from '@prisma/client'
import { TRPCError } from '@trpc/server'
import { router, adminProcedure } from '../trpc'
import { logAudit } from '../utils/audit'

export const logisticsRouter = router({
  /** Read the hotel for a program (1:1). Null if not yet set. */
  getHotel: adminProcedure
    .input(z.object({ programId: z.string() }))
    .query(async ({ ctx, input }) => {
      return ctx.prisma.hotel.findUnique({ where: { programId: input.programId } })
    }),

  /** Create or update the program's hotel. Empty link strings are stored as null. */
  upsertHotel: adminProcedure
    .input(
      z.object({
        programId: z.string(),
        name: z.string().min(1).max(200),
        address: z.string().max(500).optional(),
        link: z
          .string()
          .url()
          .or(z.literal(''))
          .optional(),
        notes: z.string().max(2000).optional(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const link = input.link && input.link.trim().length > 0 ? input.link : null
      const hotel = await ctx.prisma.hotel.upsert({
        where: { programId: input.programId },
        create: {
          programId: input.programId,
          name: input.name,
          address: input.address ?? null,
          link,
          notes: input.notes ?? null,
        },
        update: {
          name: input.name,
          address: input.address ?? null,
          link,
          notes: input.notes ?? null,
        },
      })
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'HOTEL_UPSERT',
        entityType: 'Hotel',
        entityId: hotel.id,
        detailsJson: { programId: input.programId, name: input.name },
      })
      return hotel
    }),

  /**
   * Read-only listing of every FinalistConfirmation in a program, with the
   * joined project + attendee count + decline reason. Sorted by status
   * priority (PENDING first) then deadline ascending so the most urgent
   * decisions surface at the top of the table.
   */
  listConfirmations: adminProcedure
    .input(z.object({ programId: z.string() }))
    .query(async ({ ctx, input }) => {
      const rows = await ctx.prisma.finalistConfirmation.findMany({
        where: { project: { programId: input.programId } },
        include: {
          project: {
            select: { id: true, title: true, competitionCategory: true, country: true },
          },
          _count: { select: { attendingMembers: true } },
        },
      })
      const STATUS_PRIORITY: Record<string, number> = {
        PENDING: 0,
        CONFIRMED: 1,
        DECLINED: 2,
        EXPIRED: 3,
        SUPERSEDED: 4,
      }
      return rows
        .map((r) => ({
          id: r.id,
          status: r.status,
          deadline: r.deadline,
          confirmedAt: r.confirmedAt,
          declinedAt: r.declinedAt,
          declineReason: r.declineReason,
          expiredAt: r.expiredAt,
          category: r.category,
          promotedFromWaitlistEntryId: r.promotedFromWaitlistEntryId,
          project: r.project,
          attendeeCount: r._count.attendingMembers,
        }))
        .sort((a, b) => {
          const sa = STATUS_PRIORITY[a.status] ?? 9
          const sb = STATUS_PRIORITY[b.status] ?? 9
          if (sa !== sb) return sa - sb
          return a.deadline.getTime() - b.deadline.getTime()
        })
    }),

  /**
   * List all attending members for CONFIRMED finalists in a program, with
   * their (optional) flight details. One row per attendee — even those
   * without a FlightDetail row yet, so the UI can render empty editors.
   */
  listFlightDetails: adminProcedure
    .input(z.object({ programId: z.string() }))
    .query(async ({ ctx, input }) => {
      return ctx.prisma.attendingMember.findMany({
        where: {
          confirmation: {
            status: 'CONFIRMED',
            project: { programId: input.programId },
          },
        },
        select: {
          id: true,
          needsVisa: true,
          user: { select: { id: true, name: true, email: true, country: true } },
          confirmation: {
            select: {
              project: {
                select: {
                  id: true,
                  title: true,
                  country: true,
                  competitionCategory: true,
                },
              },
            },
          },
          flightDetail: true,
        },
        orderBy: [{ user: { name: 'asc' } }],
      })
    }),

  /** Create or update a flight detail row for an attending member. */
  upsertFlightDetail: adminProcedure
    .input(
      z.object({
        attendingMemberId: z.string(),
        arrivalAt: z.date().nullable().optional(),
        arrivalFlightNumber: z.string().max(20).nullable().optional(),
        arrivalAirport: z.string().max(10).nullable().optional(),
        departureAt: z.date().nullable().optional(),
        departureFlightNumber: z.string().max(20).nullable().optional(),
        departureAirport: z.string().max(10).nullable().optional(),
        adminNotes: z.string().max(1000).nullable().optional(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const { attendingMemberId, ...rest } = input
      // Strip out undefineds so an upsert update doesn't blow away unset fields.
      const data: Record<string, unknown> = {}
      for (const [k, v] of Object.entries(rest)) {
        if (v !== undefined) data[k] = v
      }
      const detail = await ctx.prisma.flightDetail.upsert({
        where: { attendingMemberId },
        create: { attendingMemberId, ...(data as object) },
        update: data,
      })
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'FLIGHT_DETAIL_UPSERT',
        entityType: 'FlightDetail',
        entityId: detail.id,
        detailsJson: { attendingMemberId },
      })
      return detail
    }),

  /** Toggle PENDING ↔ CONFIRMED on a flight detail. */
  setFlightStatus: adminProcedure
    .input(
      z.object({
        flightDetailId: z.string(),
        status: z.nativeEnum(FlightDetailStatus),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const detail = await ctx.prisma.flightDetail.update({
        where: { id: input.flightDetailId },
        data: { status: input.status },
      })
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'FLIGHT_STATUS_SET',
        entityType: 'FlightDetail',
        entityId: detail.id,
        detailsJson: { status: input.status },
      })
      return detail
    }),

  /**
   * List all VisaApplication rows for a program, joined with the project +
   * attendee + project so the admin Visas tab can render a flat table.
   * Sorted by status priority (REQUESTED first → resolved last) so the most
   * urgent in-flight applications surface at the top.
   */
  listVisaApplications: adminProcedure
    .input(z.object({ programId: z.string() }))
    .query(async ({ ctx, input }) => {
      const rows = await ctx.prisma.visaApplication.findMany({
        where: {
          attendingMember: {
            confirmation: { project: { programId: input.programId } },
          },
        },
        include: {
          attendingMember: {
            include: {
              user: { select: { id: true, name: true, email: true } },
              confirmation: {
                select: {
                  id: true,
                  project: { select: { id: true, title: true } },
                },
              },
            },
          },
        },
      })
      const STATUS_PRIORITY: Record<VisaStatus, number> = {
        REQUESTED: 0,
        INVITATION_SENT: 1,
        APPOINTMENT_BOOKED: 2,
        GRANTED: 3,
        DENIED: 4,
        NOT_NEEDED: 5,
      }
      return rows
        .map((r) => ({
          id: r.id,
          status: r.status,
          nationality: r.nationality,
          invitationSentAt: r.invitationSentAt,
          appointmentAt: r.appointmentAt,
          decisionAt: r.decisionAt,
          notes: r.notes,
          updatedAt: r.updatedAt,
          attendee: {
            id: r.attendingMember.id,
            user: r.attendingMember.user,
          },
          project: r.attendingMember.confirmation.project,
        }))
        .sort((a, b) => {
          const sa = STATUS_PRIORITY[a.status] ?? 9
          const sb = STATUS_PRIORITY[b.status] ?? 9
          if (sa !== sb) return sa - sb
          return a.project.title.localeCompare(b.project.title)
        })
    }),

  /**
   * Update a VisaApplication's status, dates, nationality, and notes. Empty
   * date fields clear the value. Audit-logged as VISA_UPDATE.
   */
  updateVisaApplication: adminProcedure
    .input(
      z.object({
        id: z.string(),
        status: z.nativeEnum(VisaStatus).optional(),
        nationality: z.string().max(100).optional().nullable(),
        invitationSentAt: z.date().optional().nullable(),
        appointmentAt: z.date().optional().nullable(),
        decisionAt: z.date().optional().nullable(),
        notes: z.string().max(2000).optional().nullable(),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const existing = await ctx.prisma.visaApplication.findUnique({
        where: { id: input.id },
      })
      if (!existing) {
        throw new TRPCError({ code: 'NOT_FOUND', message: 'Visa application not found' })
      }
      const data: Record<string, unknown> = {}
      if (input.status !== undefined) data.status = input.status
      if (input.nationality !== undefined) data.nationality = input.nationality
      if (input.invitationSentAt !== undefined) data.invitationSentAt = input.invitationSentAt
      if (input.appointmentAt !== undefined) data.appointmentAt = input.appointmentAt
      if (input.decisionAt !== undefined) data.decisionAt = input.decisionAt
      if (input.notes !== undefined) data.notes = input.notes
      const updated = await ctx.prisma.visaApplication.update({
        where: { id: input.id },
        data,
      })
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'VISA_UPDATE',
        entityType: 'VisaApplication',
        entityId: updated.id,
        detailsJson: {
          previous: {
            status: existing.status,
            nationality: existing.nationality,
            invitationSentAt: existing.invitationSentAt,
            appointmentAt: existing.appointmentAt,
            decisionAt: existing.decisionAt,
          },
          next: data,
        },
      })
      return updated
    }),

  /** Read Program.visaStatusVisibleToMembers — drives the admin Visas tab toggle. */
  getVisaVisibility: adminProcedure
    .input(z.object({ programId: z.string() }))
    .query(async ({ ctx, input }) => {
      const program = await ctx.prisma.program.findUniqueOrThrow({
        where: { id: input.programId },
        select: { visaStatusVisibleToMembers: true },
      })
      return { visible: program.visaStatusVisibleToMembers }
    }),

  /**
   * Flip Program.visaStatusVisibleToMembers. Controls whether the team can
   * see their own visa status on the applicant dashboard.
   */
  setVisaVisibility: adminProcedure
    .input(z.object({ programId: z.string(), visible: z.boolean() }))
    .mutation(async ({ ctx, input }) => {
      const program = await ctx.prisma.program.update({
        where: { id: input.programId },
        data: { visaStatusVisibleToMembers: input.visible },
      })
      await logAudit({
        prisma: ctx.prisma,
        userId: ctx.user.id,
        action: 'VISA_VISIBILITY_SET',
        entityType: 'Program',
        entityId: program.id,
        detailsJson: { visible: input.visible },
      })
      return { visible: program.visaStatusVisibleToMembers }
    }),
})