import { useState } from 'react'
import { AlertTriangle, Building2, FileSignature, UserCheck } from 'lucide-react'

import { Badge, Panel } from '../components/ui'
import { Empty, Labeled, Note, Select, btnGhost, btnPrimary, fieldCls } from '../components/form'
import {
  COMMITMENT_TYPES,
  PARTNER_ROLES,
  PARTNER_STATUSES,
  partnerColor,
  useAddCommitment,
  useAddPartner,
  useKeyPersonnel,
  useTeamingPartners,
  useUpdateCommitment,
  useUpdatePartner,
} from '../lib/teaming'

// TEAMING AND KEY PERSONNEL, on the capture record because that is where the decisions are made.
//
// A teaming agreement is negotiated while a pursuit is being shaped, months before a proposal exists. A key
// person is named in a bid and evaluated by the customer, and if they walk between submission and award the
// score walks with them. Both were invisible to this product until now.

export function TeamingPanel({ opportunityId }: { opportunityId: string }) {
  const q = useTeamingPartners(opportunityId)
  const add = useAddPartner(opportunityId)
  const update = useUpdatePartner(opportunityId)
  const [name, setName] = useState('')
  const [role, setRole] = useState('subcontractor')

  const partners = q.data?.partners ?? []
  const unsigned = partners.filter((p) => p.status !== 'agreement_signed' && p.status !== 'declined')

  return (
    <Panel title="Teaming" hint={partners.length === 1 ? '1 partner' : `${partners.length} partners`}>
      {q.isError ? (
        <Note tone="risk">{(q.error as Error).message}</Note>
      ) : partners.length === 0 ? (
        <Empty
          title="No partners recorded"
          reason="Who you bid with is decided during capture, months before a proposal exists. This is where it is recorded so it is still known at the bid review."
        />
      ) : (
        <ul className="space-y-2">
          {partners.map((p) => (
            <li
              key={p.id}
              className="flex flex-wrap items-center justify-between gap-3 rounded-lg border border-line/60 bg-navy-950/30 px-3 py-2"
            >
              <div className="min-w-0">
                <div className="flex flex-wrap items-center gap-2">
                  <Building2 size={13} className="text-muted" />
                  <span className="text-sm font-semibold text-ink">{p.company_name}</span>
                  <Badge color={partnerColor(p.status)} subtle>
                    {PARTNER_STATUSES.find((s) => s.value === p.status)?.label ?? p.status}
                  </Badge>
                  <span className="text-[11px] text-faint">
                    {PARTNER_ROLES.find((r) => r.value === p.partner_role)?.label}
                  </span>
                </div>
                <div className="text-[11px] text-faint">
                  {p.agreement_signed_on ? `signed ${p.agreement_signed_on}` : 'no agreement on file'}
                  {p.commitments > 0 &&
                    ` · providing ${p.commitments === 1 ? '1 key person' : `${p.commitments} key people`}`}
                  {p.uei && ` · UEI ${p.uei}`}
                </div>
              </div>
              <Select
                value={p.status}
                choices={PARTNER_STATUSES}
                onChange={(v) =>
                  update.mutate({
                    id: p.id,
                    status: v as never,
                    // A signed status must carry a date, which the database enforces. Supplying today is the
                    // honest default for somebody ticking it the day it happened, and the field on the record
                    // is what corrects it if it was signed earlier.
                    agreement_signed_on:
                      v === 'agreement_signed' && !p.agreement_signed_on
                        ? new Date().toISOString().slice(0, 10)
                        : p.agreement_signed_on,
                  })
                }
                className="text-xs"
              />
            </li>
          ))}
        </ul>
      )}

      {unsigned.length > 0 && (
        <div className="mt-3">
          <Note tone="warn">
            {unsigned.length === 1 ? '1 partner has' : `${unsigned.length} partners have`} no signed agreement.
            At a bid review an unsigned partner is a plan rather than a commitment.
          </Note>
        </div>
      )}

      <form
        className="mt-3 flex flex-wrap items-end gap-2 border-t border-line/40 pt-3"
        onSubmit={(e) => {
          e.preventDefault()
          if (!name.trim()) return
          add.mutate(
            { company_name: name.trim(), partner_role: role as never },
            { onSuccess: () => setName('') },
          )
        }}
      >
        <Labeled label="Add a partner">
          <input
            value={name}
            maxLength={200}
            placeholder="Company name"
            onChange={(e) => setName(e.target.value)}
            className={`${fieldCls} max-w-xs`}
          />
        </Labeled>
        <Select value={role} choices={PARTNER_ROLES} onChange={setRole} />
        <button type="submit" disabled={!name.trim() || add.isPending} className={btnPrimary}>
          Add
        </button>
      </form>
      {add.isError && (
        <div className="mt-2">
          <Note tone="risk">{(add.error as Error).message}</Note>
        </div>
      )}
    </Panel>
  )
}

export function KeyPersonnelPanel({ opportunityId }: { opportunityId: string }) {
  const q = useKeyPersonnel(opportunityId)
  const partners = useTeamingPartners(opportunityId)
  const add = useAddCommitment(opportunityId)
  const update = useUpdateCommitment(opportunityId)
  const [open, setOpen] = useState(false)
  const [form, setForm] = useState({
    requirement_id: '',
    candidate_id: '',
    teaming_partner_id: '',
    partner_person_name: '',
    role_title: '',
    commitment_type: 'letter_of_intent',
    signed_on: '',
    expires_on: '',
  })

  const list = q.data?.commitments ?? []
  const lapsed = q.data?.lapsed ?? 0

  return (
    <Panel title="Key personnel" hint={list.length === 1 ? '1 commitment' : `${list.length} commitments`}>
      <p className="pb-2 text-[11px] leading-relaxed text-faint">
        A key person is named in the bid and evaluated by the customer. If they walk between submission and
        award the score walks with them, so what holds them is a letter of intent or a contingent offer, and
        both expire.
      </p>

      {/* THE LAPSED COUNT IS THE HEADLINE. It is the thing a bid review opens this panel to find and the one
          nobody notices on their own: a letter signed for a bid that slipped six months is not a commitment. */}
      {lapsed > 0 && (
        <div className="mb-3">
          <Note tone="risk">
            <AlertTriangle size={11} className="mr-1 inline" />
            {lapsed === 1 ? '1 commitment has' : `${lapsed} commitments have`} lapsed. The person is named in
            the bid and nothing currently holds them.
          </Note>
        </div>
      )}

      {q.isError ? (
        <Note tone="risk">{(q.error as Error).message}</Note>
      ) : list.length === 0 ? (
        <Empty
          title="Nobody committed yet"
          reason="Record who is named against each evaluated position and what holds them there."
        />
      ) : (
        <ul className="space-y-2">
          {list.map((k) => (
            <li
              key={k.id}
              className={`flex flex-wrap items-center justify-between gap-3 rounded-lg border px-3 py-2 ${
                k.lapsed ? 'border-risk/40 bg-risk/5' : 'border-line/60 bg-navy-950/30'
              }`}
            >
              <div className="min-w-0">
                <div className="flex flex-wrap items-center gap-2 text-sm">
                  <UserCheck size={13} className="text-muted" />
                  <span className="font-semibold text-ink">
                    {k.candidate_name || k.partner_person_name || 'Unnamed'}
                  </span>
                  {k.partner_company && (
                    <span className="text-[11px] text-faint">via {k.partner_company}</span>
                  )}
                  <Badge color={k.lapsed ? 'var(--color-risk)' : 'var(--color-blue)'} subtle>
                    {COMMITMENT_TYPES.find((c) => c.value === k.commitment_type)?.label ?? k.commitment_type}
                  </Badge>
                </div>
                <div className="text-[11px] text-faint">
                  {k.requirement_title}
                  {k.role_title ? ` · ${k.role_title}` : ''}
                  {k.expires_on &&
                    (k.lapsed
                      ? ` · LAPSED ${k.expires_on}`
                      : ` · holds until ${k.expires_on}${
                          k.days_until_expiry !== undefined ? `, ${k.days_until_expiry} days` : ''
                        }`)}
                </div>
              </div>
              <Select
                value={k.status}
                choices={[
                  { value: 'proposed', label: 'Proposed' },
                  { value: 'committed', label: 'Committed' },
                  { value: 'withdrawn', label: 'Withdrawn' },
                  { value: 'superseded', label: 'Superseded' },
                ]}
                onChange={(v) =>
                  update.mutate({
                    id: k.id,
                    status: v,
                    signed_on:
                      v === 'committed' && !k.signed_on ? new Date().toISOString().slice(0, 10) : k.signed_on,
                  })
                }
                className="text-xs"
              />
            </li>
          ))}
        </ul>
      )}

      <div className="mt-3 border-t border-line/40 pt-3">
        {!open ? (
          <button type="button" className={btnGhost} onClick={() => setOpen(true)}>
            <FileSignature size={13} /> Commit somebody to a position
          </button>
        ) : (
          <form
            className="space-y-2"
            onSubmit={(e) => {
              e.preventDefault()
              add.mutate(form, { onSuccess: () => setOpen(false) })
            }}
          >
            <div className="grid gap-2 sm:grid-cols-2">
              <Labeled label="Position" hint="the evaluated requirement they are named against">
                <input
                  value={form.requirement_id}
                  placeholder="requirement id"
                  onChange={(e) => setForm({ ...form, requirement_id: e.target.value })}
                  className={fieldCls}
                />
              </Labeled>
              <Labeled label="Role title">
                <input
                  value={form.role_title}
                  maxLength={200}
                  placeholder="Program Manager"
                  onChange={(e) => setForm({ ...form, role_title: e.target.value })}
                  className={fieldCls}
                />
              </Labeled>
              {/* EITHER our candidate OR a partner's person, never both. The database refuses a row naming
                  neither or both, and saying so here means the refusal is rare rather than routine. */}
              <Labeled label="One of your candidates" hint="leave empty if a partner provides them">
                <input
                  value={form.candidate_id}
                  placeholder="candidate id"
                  onChange={(e) => setForm({ ...form, candidate_id: e.target.value, teaming_partner_id: '', partner_person_name: '' })}
                  className={fieldCls}
                />
              </Labeled>
              <Labeled label="Or a partner provides them">
                <Select
                  value={form.teaming_partner_id}
                  choices={[
                    { value: '', label: 'Not a partner' },
                    ...(partners.data?.partners ?? []).map((p) => ({ value: p.id, label: p.company_name })),
                  ]}
                  onChange={(v) => setForm({ ...form, teaming_partner_id: v, candidate_id: '' })}
                  className="w-full"
                />
              </Labeled>
              {form.teaming_partner_id && (
                <Labeled label="Their name">
                  <input
                    value={form.partner_person_name}
                    maxLength={200}
                    onChange={(e) => setForm({ ...form, partner_person_name: e.target.value })}
                    className={fieldCls}
                  />
                </Labeled>
              )}
              <Labeled label="What holds them">
                <Select
                  value={form.commitment_type}
                  choices={COMMITMENT_TYPES}
                  onChange={(v) => setForm({ ...form, commitment_type: v })}
                  className="w-full"
                />
              </Labeled>
              <Labeled label="Signed">
                <input
                  type="date"
                  value={form.signed_on}
                  onChange={(e) => setForm({ ...form, signed_on: e.target.value })}
                  className={fieldCls}
                />
              </Labeled>
              <Labeled label="Holds until" hint="after this it is not a commitment any more">
                <input
                  type="date"
                  value={form.expires_on}
                  onChange={(e) => setForm({ ...form, expires_on: e.target.value })}
                  className={fieldCls}
                />
              </Labeled>
            </div>
            <div className="flex gap-2">
              <button type="submit" disabled={add.isPending} className={btnPrimary}>
                {add.isPending ? 'Saving' : 'Record it'}
              </button>
              <button type="button" className={btnGhost} onClick={() => setOpen(false)}>
                Cancel
              </button>
            </div>
            {add.isError && <Note tone="risk">{(add.error as Error).message}</Note>}
          </form>
        )}
      </div>
    </Panel>
  )
}