'use client';

import { useGameStore, canAffordSpellCost } from '@/lib/game/store';
import { ELEMENTS, SPELLS_DEF } from '@/lib/game/constants';
import { useStudyStats } from '@/lib/game/hooks/useGameDerived';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Progress } from '@/components/ui/progress';

// Format spell cost for display
function formatSpellCost(cost: { type: 'raw' | 'element'; element?: string; amount: number }): string {
  if (cost.type === 'raw') {
    return `${cost.amount} raw`;
  }
  const elemDef = ELEMENTS[cost.element || ''];
  return `${cost.amount} ${elemDef?.sym || '?'}`;
}

// Get cost color
function getSpellCostColor(cost: { type: 'raw' | 'element'; element?: string; amount: number }): string {
  if (cost.type === 'raw') {
    return '#60A5FA';
  }
  return ELEMENTS[cost.element || '']?.color || '#9CA3AF';
}

// Format study time
function formatStudyTime(hours: number): string {
  if (hours < 1) return `${Math.round(hours * 60)}m`;
  return `${hours.toFixed(1)}h`;
}

export function SpellsTab() {
  const store = useGameStore();
  const { studySpeedMult, studyCostMult } = useStudyStats();
  
  const spellTiers = [0, 1, 2, 3, 4];
  
  return (
    <div className="space-y-6">
      {spellTiers.map(tier => {
        const spellsInTier = Object.entries(SPELLS_DEF).filter(([, def]) => def.tier === tier);
        if (spellsInTier.length === 0) return null;
        
        const tierNames = ['Basic Spells (Raw Mana)', 'Tier 1 - Elemental', 'Tier 2 - Advanced', 'Tier 3 - Master', 'Tier 4 - Legendary'];
        const tierColors = ['text-gray-400', 'text-green-400', 'text-blue-400', 'text-purple-400', 'text-amber-400'];
        
        return (
          <div key={tier}>
            <h3 className={`text-lg font-semibold mb-3 ${tierColors[tier]}`}>{tierNames[tier]}</h3>
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
              {spellsInTier.map(([id, def]) => {
                const state = store.spells[id];
                const learned = state?.learned;
                const isStudying = store.currentStudyTarget?.id === id;
                const elemDef = def.elem === 'raw' ? null : ELEMENTS[def.elem];
                const baseStudyTime = def.studyTime || (def.tier * 4);
                const isActive = store.activeSpell === id;
                const canCast = learned && canAffordSpellCost(def.cost, store.rawMana, store.elements);
                
                // Apply skill modifiers
                const studyTime = baseStudyTime / studySpeedMult;
                const unlockCost = Math.floor(def.unlock * studyCostMult);
                
                // Can start studying?
                const canStudy = !learned && !isStudying && store.rawMana >= unlockCost;
                
                return (
                  <Card
                    key={id}
                    className={`bg-gray-900/80 border-gray-700 ${learned ? '' : 'opacity-75'} ${isStudying ? 'border-purple-500' : ''} ${canCast ? 'ring-1 ring-green-500/30' : ''}`}
                  >
                    <CardHeader className="pb-2">
                      <div className="flex items-center justify-between">
                        <CardTitle className="text-sm game-panel-title" style={{ color: def.elem === 'raw' ? '#60A5FA' : elemDef?.color }}>
                          {def.name}
                        </CardTitle>
                        {def.tier > 0 && (
                          <Badge variant="outline" className="text-xs">
                            T{def.tier}
                          </Badge>
                        )}
                      </div>
                    </CardHeader>
                    <CardContent className="space-y-2">
                      <div className="text-xs text-gray-400">
                        {def.elem !== 'raw' && <span className="mr-2">{elemDef?.sym} {elemDef?.name}</span>}
                        <span className="mr-2">⚔️ {def.dmg} dmg</span>
                      </div>
                      
                      {/* Cost display */}
                      <div className="text-xs game-mono" style={{ color: getSpellCostColor(def.cost) }}>
                        Cost: {formatSpellCost(def.cost)}
                      </div>
                      
                      {def.desc && (
                        <div className="text-xs text-gray-500 italic">{def.desc}</div>
                      )}
                      
                      {def.effects && def.effects.length > 0 && (
                        <div className="flex gap-1 flex-wrap">
                          {def.effects.map((eff, i) => (
                            <Badge key={i} variant="outline" className="text-xs">
                              {eff.type === 'burn' && `🔥 Burn`}
                              {eff.type === 'stun' && `⚡ Stun`}
                              {eff.type === 'pierce' && `🎯 Pierce`}
                              {eff.type === 'multicast' && `✨ Multicast`}
                            </Badge>
                          ))}
                        </div>
                      )}
                      
                      {learned ? (
                        <div className="flex gap-2">
                          <Badge className="bg-green-900/50 text-green-300">Learned</Badge>
                          {isActive && <Badge className="bg-amber-900/50 text-amber-300">Active</Badge>}
                          {!isActive && (
                            <Button size="sm" variant="outline" onClick={() => store.setSpell(id)}>
                              Set Active
                            </Button>
                          )}
                        </div>
                      ) : isStudying ? (
                        <div className="space-y-1">
                          <Progress 
                            value={Math.min(100, ((state?.studyProgress || 0) / studyTime) * 100)} 
                            className="h-2 bg-gray-800" 
                          />
                          <div className="text-xs text-purple-400">
                            Studying... {formatStudyTime(state?.studyProgress || 0)}/{formatStudyTime(studyTime)}
                          </div>
                        </div>
                      ) : (
                        <div className="space-y-2">
                          <div className="text-xs text-gray-500">
                            <span className={studySpeedMult > 1 ? 'text-green-400' : ''}>
                              Study: {formatStudyTime(studyTime)}{studySpeedMult > 1 && <span className="text-xs ml-1">({Math.round(studySpeedMult * 100)}% speed)</span>}
                            </span>
                            {' • '}
                            <span className={studyCostMult < 1 ? 'text-green-400' : ''}>
                              Cost: {fmt(unlockCost)} mana{studyCostMult < 1 && <span className="text-xs ml-1">({Math.round(studyCostMult * 100)}% cost)</span>}
                            </span>
                          </div>
                          <Button
                            size="sm"
                            variant={canStudy ? 'default' : 'outline'}
                            disabled={!canStudy}
                            className={canStudy ? 'bg-purple-600 hover:bg-purple-700' : 'opacity-50'}
                            onClick={() => store.startStudyingSpell(id)}
                          >
                            Start Study ({fmt(unlockCost)} mana)
                          </Button>
                        </div>
                      )}
                    </CardContent>
                  </Card>
                );
              })}
            </div>
          </div>
        );
      })}
    </div>
  );
}