'use client';

import React from 'react';
import { ELEMENTS } from '@/lib/game/constants';
import type { GuardianDef, GuardianBoon } from '@/lib/game/types';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Shield, Swords, Clock, Sparkles, Check, Lock, ChevronRight, Heart, Hexagon } from 'lucide-react';
import clsx from 'clsx';
import { DebugName } from '@/components/game/debug/debug-context';

// ─── Types ───────────────────────────────────────────────────────────────────

export type GuardianStatus = 'undefeated' | 'defeated' | 'signed';

export interface FloorTier {
  label: string;
  floors: number[];
}

// ─── Element Display Helper ──────────────────────────────────────────────────

interface ElementDisplay {
  sym: string;
  name: string;
  color: string;
}

function getElementDisplays(element: string | string[]): ElementDisplay[] {
  const parts = Array.isArray(element) ? element : element.split('+');
  return parts.map((el) => {
    const def = ELEMENTS[el];
    return {
      sym: def?.sym ?? '?',
      name: def?.name ?? el,
      color: def?.color ?? '#888',
    };
  });
}

// ─── Guardian Card ───────────────────────────────────────────────────────────

interface GuardianCardProps {
  floor: number;
  guardian: GuardianDef;
  status: GuardianStatus;
  canAfford: boolean;
  hasSlot: boolean;
  isRitualActive: boolean;
  ritualProgress: number;
  onStartRitual: (floor: number) => void;
}

export const GuardianCard: React.FC<GuardianCardProps> = React.memo(({
  floor,
  guardian,
  status,
  canAfford,
  hasSlot,
  isRitualActive,
  ritualProgress,
  onStartRitual,
}) => {
  const elemDisplays = getElementDisplays(guardian.element);
  const primaryColor = elemDisplays[0]?.color ?? '#888';
  const isCombo = elemDisplays.length > 1;

  const statusConfig: Record<GuardianStatus, { label: string; color: string; bg: string }> = {
    undefeated: { label: 'Undefeated', color: 'text-gray-400', bg: 'bg-gray-800/50' },
    defeated: { label: 'Pact Available', color: 'text-amber-400', bg: 'bg-amber-900/20' },
    signed: { label: 'Pact Signed', color: 'text-green-400', bg: 'bg-green-900/20' },
  };

  const sc = statusConfig[status];
  const ritualTime = guardian.pactTime;
  const ritualComplete = ritualProgress >= ritualTime;

  // Build element label: single element name, or "Fire + Water" for combos
  const elementLabel = isCombo
    ? elemDisplays.map(e => e.name).join(' + ')
    : elemDisplays[0]?.name ?? guardian.element.join(' + ');

  return (
    <DebugName name="GuardianPactsComponents">
      <Card
        className={clsx(
          'border transition-colors',
          status === 'signed' && 'border-green-600/40',
          status === 'defeated' && 'border-amber-600/40',
          status === 'undefeated' && 'border-gray-700/60',
        )}
      >
      <CardHeader className="pb-2">
        <div className="flex items-start justify-between gap-2">
          <div className="min-w-0">
            <CardTitle className="text-sm flex items-center gap-2" style={{ color: primaryColor }}>
              <span className="flex items-center gap-0.5">
                {elemDisplays.map((e, i) => (
                  <span key={i}>{e.sym}</span>
                ))}
              </span>
              <span className="truncate">{guardian.name}</span>
            </CardTitle>
            <div className="text-xs text-gray-500 mt-0.5">
              Floor {floor} · {elementLabel}
              {isCombo && <span className="ml-1 text-purple-400">✦ Combo</span>}
            </div>
          </div>
          <Badge className={clsx('text-[10px] px-1.5 py-0 shrink-0', sc.bg, sc.color)}>
            {sc.label}
          </Badge>
        </div>
      </CardHeader>

      <CardContent className="space-y-3">
        <GuardianStats guardian={guardian} />
        <GuardianBoons guardian={guardian} />

        <div className="text-xs text-gray-400">
          <span className="text-gray-500">Perk:</span> {guardian.uniquePerk}
        </div>

        <div className="flex items-center gap-3 text-xs text-gray-400">
          <div className="flex items-center gap-1">
            <Clock className="w-3 h-3" />
            <span>{ritualTime}h</span>
          </div>
          <div>
            <span className="text-gray-500">Cost:</span> {guardian.pactCost.toLocaleString()} mana
          </div>
        </div>

        {isRitualActive && (
          <RitualProgress ritualProgress={ritualProgress} ritualTime={ritualTime} ritualComplete={ritualComplete} />
        )}

        {status === 'defeated' && !isRitualActive && (
          <PactActionButton
            canAfford={canAfford}
            hasSlot={hasSlot}
            onStartRitual={() => onStartRitual(floor)}
          />
        )}
      </CardContent>
      </Card>
    </DebugName>
  );
});

GuardianCard.displayName = 'GuardianCard';

// ─── Guardian Stats ──────────────────────────────────────────────────────────

function GuardianStats({ guardian }: { guardian: GuardianDef }) {
  const hasShield = !!(guardian.shield && guardian.shield > 0);
  const hasBarrier = !!(guardian.barrier && guardian.barrier > 0);
  const hasHealthRegen = !!(guardian.healthRegen && guardian.healthRegen > 0);

  return (
    <div className="space-y-1.5">
      <div className="grid grid-cols-3 gap-2 text-xs">
        <div className="flex items-center gap-1 text-gray-400">
          <Shield className="w-3 h-3" />
          <span>Health: {guardian.hp.toLocaleString()}</span>
        </div>
        <div className="flex items-center gap-1 text-gray-400">
          <Swords className="w-3 h-3" />
          <span>Power: {guardian.power.toLocaleString()}</span>
        </div>
        <div className="flex items-center gap-1 text-gray-400">
          <Shield className="w-3 h-3" />
          <span>Armor: {Math.round((guardian.armor ?? 0) * 100)}%</span>
        </div>
      </div>
      {(hasShield || hasBarrier || hasHealthRegen) && (
        <div className="grid grid-cols-3 gap-2 text-xs border-t border-gray-700/40 pt-1.5">
          {hasShield && (
            <div className="flex items-center gap-1 text-cyan-400">
              <Hexagon className="w-3 h-3" />
              <span>Shield: {guardian.shield!.toLocaleString()}</span>
            </div>
          )}
          {hasBarrier && (
            <div className="flex items-center gap-1 text-blue-400">
              <Shield className="w-3 h-3" />
              <span>Barrier: {Math.round(guardian.barrier! * 100)}%</span>
            </div>
          )}
          {hasHealthRegen && (
            <div className="flex items-center gap-1 text-green-400">
              <Heart className="w-3 h-3" />
              <span>Regen: {guardian.healthRegenIsPercent ? guardian.healthRegen + '%/tick' : guardian.healthRegen + '/tick'}</span>
            </div>
          )}
        </div>
      )}
    </div>
  );
}

// ─── Guardian Boons ──────────────────────────────────────────────────────────

function GuardianBoons({ guardian }: { guardian: GuardianDef }) {
  return (
    <div className="space-y-1">
      <div className="text-xs font-medium text-gray-300 flex items-center gap-1">
        <Sparkles className="w-3 h-3" /> Boons
      </div>
      <div className="flex flex-wrap gap-1">
        {guardian.boons.map((boon: GuardianBoon, i: number) => (
          <span
            key={i}
            className="px-1.5 py-0.5 text-[10px] rounded border border-gray-600/50 text-gray-300"
          >
            {boon.desc}
          </span>
        ))}
      </div>
    </div>
  );
}

// ─── Ritual Progress ─────────────────────────────────────────────────────────

function RitualProgress({ ritualProgress, ritualTime, ritualComplete }: { ritualProgress: number; ritualTime: number; ritualComplete: boolean }) {
  return (
    <div className="space-y-1">
      <div className="flex justify-between text-xs">
        <span className="text-amber-400">Ritual in progress…</span>
        <span className="text-gray-400">{ritualProgress}/{ritualTime}h</span>
      </div>
      <div className="w-full bg-gray-700 rounded-full h-1.5">
        <div
          className="bg-amber-500 h-1.5 rounded-full transition-all"
          style={{ width: `${Math.min(100, (ritualProgress / ritualTime) * 100)}%` }}
        />
      </div>
      {ritualComplete && (
        <div className="text-xs text-green-400 flex items-center gap-1">
          <Check className="w-3 h-3" /> Ritual complete — pact will be signed on next tick
        </div>
      )}
    </div>
  );
}

// ─── Pact Action Button ──────────────────────────────────────────────────────

function PactActionButton({ canAfford, hasSlot, onStartRitual }: { canAfford: boolean; hasSlot: boolean; onStartRitual: () => void }) {
  const disabled = !canAfford || !hasSlot;
  return (
    <button
      onClick={onStartRitual}
      disabled={disabled}
      className={clsx(
        'w-full rounded px-3 py-1.5 text-xs font-medium transition-colors flex items-center justify-center gap-1',
        !disabled
          ? 'bg-amber-600/80 text-white hover:bg-amber-500'
          : 'bg-gray-700 text-gray-500 cursor-not-allowed',
      )}
    >
      {!canAfford ? (
        <><Lock className="w-3 h-3" /> Not enough mana</>
      ) : !hasSlot ? (
        <><Lock className="w-3 h-3" /> No pact slots</>
      ) : (
        <><ChevronRight className="w-3 h-3" /> Begin Pact Ritual</>
      )}
    </button>
  );
}

// ─── Pact Header Summary ────────────────────────────────────────────────────

export function PactHeaderSummary({
  signedCount,
  pactSlots,
  defeatedCount,
  cumulativeBoons,
}: {
  signedCount: number;
  pactSlots: number;
  defeatedCount: number;
  cumulativeBoons: Record<string, number>;
}) {
  return (
    <Card className="bg-[var(--bg-panel)] border-[var(--border-subtle)]">
      <CardContent className="py-3">
        <div className="flex flex-wrap items-center gap-4 text-xs">
          <div className="flex items-center gap-1.5">
            <Shield className="w-3.5 h-3.5 text-amber-400" />
            <span className="text-gray-400">Pact Slots:</span>
            <span className="text-gray-200">{signedCount} / {pactSlots}</span>
          </div>
          <div className="flex items-center gap-1.5">
            <Check className="w-3.5 h-3.5 text-green-400" />
            <span className="text-gray-400">Signed:</span>
            <span className="text-green-400">{signedCount}</span>
          </div>
          <div className="flex items-center gap-1.5">
            <Swords className="w-3.5 h-3.5 text-red-400" />
            <span className="text-gray-400">Defeated:</span>
            <span className="text-red-400">{defeatedCount}</span>
          </div>
        </div>

        {signedCount > 0 && (
          <div className="mt-2 pt-2 border-t border-gray-700/50">
            <div className="text-xs text-gray-400 mb-1">Active Boon Effects:</div>
            <div className="flex flex-wrap gap-1">
              {Object.entries(cumulativeBoons).map(([type, value]) => (
                <span
                  key={type}
                  className="px-1.5 py-0.5 text-[10px] rounded border border-green-600/30 text-green-300 bg-green-900/20"
                >
                  {type}: +{value}
                </span>
              ))}
            </div>
          </div>
        )}
      </CardContent>
    </Card>
  );
}

// ─── Tier Filter ─────────────────────────────────────────────────────────────

export function TierFilter({
  tiers,
  activeTier,
  guardianFloors,
  onSelectTier,
}: {
  tiers: FloorTier[];
  activeTier: string;
  guardianFloors: number[];
  onSelectTier: (tier: string) => void;
}) {
  return (
    <div className="flex gap-2 flex-wrap">
      <button
        onClick={() => onSelectTier('all')}
        className={clsx(
          'rounded px-3 py-1 text-xs font-medium transition-colors',
          activeTier === 'all'
            ? 'bg-amber-600 text-white'
            : 'text-gray-400 hover:text-gray-200',
        )}
      >
        All ({guardianFloors.length})
      </button>
      {tiers.map((tier) => (
        <button
          key={tier.label}
          onClick={() => onSelectTier(tier.label)}
          className={clsx(
            'rounded px-3 py-1 text-xs font-medium transition-colors',
            activeTier === tier.label
              ? 'bg-amber-600 text-white'
              : 'text-gray-400 hover:text-gray-200',
          )}
        >
          {tier.label} ({tier.floors.length})
        </button>
      ))}
    </div>
  );
}