import type { ReactNode } from 'react'
import {
  AlertTriangle,
  Award,
  BadgeCheck,
  Briefcase,
  CalendarClock,
  CheckCircle2,
  Clock,
  Crown,
  FileText,
  MapPin,
  ShieldCheck,
  Target,
  TrendingUp,
} from 'lucide-react'
import type { CandidateListView, RequirementListView, ScreenView } from '../lib/types'
import { bandColor, clearanceLabel, num, stateColor } from '../lib/format'
import { Badge, CheckRow, Panel, ScoreRow } from './ui'
import { Gauge } from './Gauge'

function winColor(code: string): string {
  return code === 'high'
    ? 'var(--color-ok)'
    : code === 'medium'
      ? 'var(--color-warn)'
      : 'var(--color-risk)'
}

export function ScreeningResults({
  view,
  candidate,
  requirement,
  hideHeader = false,
}: {
  view: ScreenView
  candidate: CandidateListView
  requirement: RequirementListView
  hideHeader?: boolean
}) {
  const mr = view.mission_readiness
  const ci = view.clearance_intelligence
  const wi = view.win_impact
  const matched = view.match.matched_skills.filter((m) => m.matched)

  return (
    <div className="space-y-4">
      {/* SECTION A, Candidate Summary */}
      {!hideHeader && (
      <Panel className="flex flex-wrap items-center justify-between gap-4 p-4">
        <div className="flex items-center gap-4">
          <div className="grid size-14 place-items-center rounded-xl bg-blue/25 text-xl font-bold text-blue-soft">
            {candidate.full_name
              .split(' ')
              .map((p) => p[0])
              .slice(0, 2)
              .join('')}
          </div>
          <div>
            <div className="flex items-center gap-2">
              <h2 className="text-xl font-bold">{candidate.full_name}</h2>
              <span style={{ color: 'var(--color-gold)' }}>
                <BadgeCheck size={18} />
              </span>
            </div>
            <div className="mt-0.5 flex flex-wrap items-center gap-x-4 gap-y-1 text-sm text-muted">
              <span className="flex items-center gap-1.5">
                <Briefcase size={14} /> {requirement.title}
              </span>
              <span className="flex items-center gap-1.5">
                <Clock size={14} /> {candidate.years_experience} yrs
              </span>
              {candidate.location && (
                <span className="flex items-center gap-1.5">
                  <MapPin size={14} /> {candidate.location}
                </span>
              )}
              <span className="flex items-center gap-1.5">
                <ShieldCheck size={14} /> {clearanceLabel[candidate.clearance_level] ?? candidate.clearance_level}
              </span>
            </div>
          </div>
        </div>
        <div className="flex items-center gap-2">
          <Badge color={candidate.available ? 'var(--color-ok)' : 'var(--color-warn)'} subtle>
            {candidate.available ? 'Available Now' : 'Not Available'}
          </Badge>
          <button className="flex items-center gap-1.5 rounded-lg border border-line/70 px-3 py-1.5 text-sm font-semibold text-muted hover:text-ink">
            <FileText size={14} /> Export Report
          </button>
        </div>
      </Panel>
      )}

      <div className="grid grid-cols-1 gap-4 lg:grid-cols-12">
        {/* SECTION B, Mission Readiness gauge */}
        <Panel className="lg:col-span-4 grid place-items-center py-6">
          <Gauge value={num(mr.score)} color={bandColor(mr.band)} status={mr.status} />
          <p className="mt-3 max-w-[18rem] text-center text-sm text-muted">{view.match.explanation}</p>
        </Panel>

        {/* SECTION C + D, Requirement summary + qualification breakdown */}
        <div className="lg:col-span-5 space-y-4">
          <Panel title="Requirement">
            <div className="flex items-center justify-between">
              <div>
                <div className="text-base font-bold">{requirement.title}</div>
                <div className="text-sm text-muted">
                  {requirement.customer_agency ?? 'No specific customer'} ·{' '}
                  {clearanceLabel[requirement.required_level] ?? requirement.required_level} required
                </div>
              </div>
              {requirement.key_personnel && (
                <Badge color="var(--color-gold)" subtle>
                  <Crown size={12} /> Key Personnel
                </Badge>
              )}
            </div>
          </Panel>
          <Panel title="Qualification Breakdown" hint="why the score was generated">
            <div className="space-y-3">
              {mr.categories.map((cat) => (
                <ScoreRow
                  key={cat.name}
                  name={cat.name}
                  weight={cat.weight}
                  score={cat.score}
                  color={stateColor(cat.state)}
                />
              ))}
            </div>
            <div className="mt-3 space-y-1 border-t border-line/60 pt-2.5">
              <div className="text-[11px] font-bold uppercase tracking-wider text-muted">Evidence</div>
              {view.match.trace.map((t) => (
                <p key={t.component} className="text-xs leading-relaxed text-faint">
                  <span className="font-semibold text-muted">{t.component}</span> ({t.weight}): {t.rationale}
                </p>
              ))}
              <p className="pt-1 text-[11px] text-faint">
                Weight profile <span className="font-semibold text-muted">{view.match.weight_profile_version}</span>, applied by the scoring engine and recorded with this result.
              </p>
            </div>
          </Panel>
        </div>

        {/* SECTION H (Win) + Clearance Intelligence */}
        <div className="lg:col-span-3 space-y-4">
          <Panel title="Win Impact™">
            <div className="text-2xl font-extrabold" style={{ color: winColor(wi.level_code) }}>
              {wi.level}
            </div>
            <div className="mt-0.5 text-xs text-faint">
              Staffing strength {num(wi.staffing_strength).toFixed(0)}%
            </div>
            <ul className="mt-2.5 space-y-1.5">
              {(wi.reasons ?? []).map((r) => (
                <li key={r} className="flex items-start gap-1.5 text-sm text-ink">
                  <CheckCircle2 size={15} style={{ color: 'var(--color-ok)' }} className="mt-0.5 shrink-0" />
                  {r}
                </li>
              ))}
            </ul>
          </Panel>
          <Panel title="Clearance Intelligence">
            <div className="flex items-center justify-between">
              <span className="text-lg font-bold">{ci.current}</span>
              <Badge color={ci.expired ? 'var(--color-risk)' : 'var(--color-ok)'} subtle>
                {ci.expired ? 'Expired' : ci.status}
              </Badge>
            </div>
            <div className={`mt-1 text-[11px] ${ci.verified ? 'font-semibold text-ok' : 'text-faint'}`}>
              {ci.verified ? '✓ ' : ''}
              {ci.provenance_label}
              {ci.verified_at ? ` ${ci.verified_at}` : ''}
            </div>
            <div className="mt-2.5 flex flex-wrap gap-1.5">
              {ci.sci_eligible && <Tag>SCI Eligible</Tag>}
              {ci.ci_poly_eligible && <Tag>CI Poly Eligible</Tag>}
              {ci.full_scope_poly && <Tag>Full Scope Poly</Tag>}
              {ci.recent_classified_support && <Tag>Recent Classified Support</Tag>}
            </div>
            <dl className="mt-3 space-y-1.5 text-sm">
              {typeof ci.investigation_age_months === 'number' && (
                <Row icon={<CalendarClock size={14} />} k="Investigation age" v={`${ci.investigation_age_months} mo`} />
              )}
              {ci.expires_at && <Row icon={<Clock size={14} />} k="Expires" v={ci.expires_at} />}
            </dl>
          </Panel>
        </div>
      </div>

      <div className="grid grid-cols-1 gap-4 lg:grid-cols-2">
        {/* SECTION E, Top Matching Skills */}
        <Panel title="Top Matching Skills">
          {matched.length === 0 ? (
            <p className="text-sm text-faint">No specific skills required for this requirement.</p>
          ) : (
            <div className="space-y-2.5">
              {matched.map((m) => (
                <div key={m.required_skill} className="flex items-center justify-between">
                  <span className="flex items-center gap-2 text-sm">
                    <Target size={14} style={{ color: 'var(--color-blue-soft)' }} />
                    {m.required_skill}
                  </span>
                  <Badge color={m.exact ? 'var(--color-ok)' : 'var(--color-blue)'} subtle>
                    {m.exact ? 'Exact' : `Semantic ${(num(m.similarity) * 100).toFixed(0)}%`}
                  </Badge>
                </div>
              ))}
            </div>
          )}
        </Panel>

        {/* SECTION F, Gaps to Review */}
        <Panel title="Gaps to Review">
          {view.battle_card.gaps.length === 0 ? (
            <p className="flex items-center gap-2 text-sm" style={{ color: 'var(--color-ok)' }}>
              <CheckCircle2 size={16} /> No mandatory gaps identified.
            </p>
          ) : (
            <ul className="space-y-1.5">
              {view.battle_card.gaps.map((g) => (
                <li key={g} className="flex items-start gap-2 text-sm text-warn">
                  <AlertTriangle size={15} className="mt-0.5 shrink-0" />
                  {g}
                </li>
              ))}
            </ul>
          )}
        </Panel>

        {/* SECTION H, Battle Card */}
        <Panel title="Candidate Battle Card™">
          <div className="grid grid-cols-2 gap-4">
            <div>
              <div className="mb-1.5 text-[11px] font-bold uppercase tracking-wider text-muted">Strengths</div>
              <ul className="space-y-1">
                {view.battle_card.strengths.length === 0 && <li className="text-sm text-faint">n/a</li>}
                {view.battle_card.strengths.map((s) => (
                  <li key={s} className="flex items-start gap-1.5 text-sm">
                    <CheckCircle2 size={14} style={{ color: 'var(--color-ok)' }} className="mt-0.5 shrink-0" />
                    {s}
                  </li>
                ))}
              </ul>
            </div>
            <div>
              <div className="mb-1.5 text-[11px] font-bold uppercase tracking-wider text-muted">Risks</div>
              <ul className="space-y-1">
                {view.battle_card.gaps.length === 0 && <li className="text-sm text-faint">None</li>}
                {view.battle_card.gaps.map((g) => (
                  <li key={g} className="flex items-start gap-1.5 text-sm">
                    <AlertTriangle size={14} style={{ color: 'var(--color-warn)' }} className="mt-0.5 shrink-0" />
                    {g}
                  </li>
                ))}
              </ul>
            </div>
          </div>
        </Panel>

        {/* Contract Readiness */}
        <Panel title="Contract Readiness">
          <div className="space-y-1.5">
            {view.contract_readiness.areas.map((a) => (
              <CheckRow key={a.area} ok={a.met} label={a.area} />
            ))}
          </div>
          {view.contract_readiness.risks.length > 0 && (
            <div className="mt-3 border-t border-line/60 pt-2.5">
              <div className="mb-1.5 text-[11px] font-bold uppercase tracking-wider text-muted">Risk Areas</div>
              <ul className="space-y-1">
                {view.contract_readiness.risks.map((r) => (
                  <li key={r.message} className="flex items-start gap-1.5 text-sm text-warn">
                    <AlertTriangle size={14} className="mt-0.5 shrink-0" />
                    {r.message}
                  </li>
                ))}
              </ul>
            </div>
          )}
        </Panel>
      </div>

      {/* SECTION I, Recommended Next Actions */}
      <Panel title="Recommended Next Actions">
        <div className="flex flex-wrap gap-2.5">
          {view.next_steps.map((step, i) => (
            <button
              key={step.action}
              className={`group flex items-center gap-2 rounded-lg px-4 py-2.5 text-sm font-semibold transition-colors ${
                i === 0
                  ? 'bg-gradient-to-r from-blue to-navy-700 text-white hover:brightness-110'
                  : 'border border-line/70 text-muted hover:text-ink'
              }`}
              title={step.reason}
            >
              {i === 0 ? <TrendingUp size={15} /> : <Award size={15} />}
              {step.action}
            </button>
          ))}
        </div>
      </Panel>
    </div>
  )
}

function Tag({ children }: { children: ReactNode }) {
  return (
    <span className="rounded-md border border-line/70 bg-navy-800/60 px-2 py-0.5 text-[11px] font-medium text-blue-soft">
      {children}
    </span>
  )
}

function Row({ icon, k, v }: { icon: ReactNode; k: string; v: string }) {
  return (
    <div className="flex items-center justify-between">
      <span className="flex items-center gap-1.5 text-muted">
        {icon} {k}
      </span>
      <span className="font-semibold tabular-nums">{v}</span>
    </div>
  )
}