'use client';

import { ELEMENTS, GUARDIANS, SKILLS_DEF } from '@/lib/game/constants';
import { SKILL_EVOLUTION_PATHS, getTierMultiplier } from '@/lib/game/skill-evolution';
import { hasSpecial, SPECIAL_EFFECTS } from '@/lib/game/effects';
import { fmt, fmtDec, calcDamage } from '@/lib/game/store';
import type { SkillUpgradeChoice, GameStore, UnifiedEffects } from '@/lib/game/types';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Separator } from '@/components/ui/separator';
import { Droplet, Swords, BookOpen, FlaskConical, Trophy, RotateCcw, Star } from 'lucide-react';

export interface StatsTabProps {
  store: GameStore;
  upgradeEffects: UnifiedEffects;
  maxMana: number;
  baseRegen: number;
  clickMana: number;
  meditationMultiplier: number;
  effectiveRegen: number;
  incursionStrength: number;
  manaCascadeBonus: number;
  studySpeedMult: number;
  studyCostMult: number;
}

export function StatsTab({
  store,
  upgradeEffects,
  maxMana,
  baseRegen,
  clickMana,
  meditationMultiplier,
  effectiveRegen,
  incursionStrength,
  manaCascadeBonus,
  studySpeedMult,
  studyCostMult,
}: StatsTabProps) {
  // Compute element max
  const elemMax = (() => {
    const ea = store.skillTiers?.elemAttune || 1;
    const tieredSkillId = ea > 1 ? `elemAttune_t${ea}` : 'elemAttune';
    const level = store.skills[tieredSkillId] || store.skills.elemAttune || 0;
    const tierMult = getTierMultiplier(tieredSkillId);
    return 10 + level * 50 * tierMult + (store.prestigeUpgrades.elementalAttune || 0) * 25;
  })();

  // Get all selected skill upgrades
  const getAllSelectedUpgrades = () => {
    const upgrades: { skillId: string; upgrade: SkillUpgradeChoice }[] = [];
    for (const [skillId, selectedIds] of Object.entries(store.skillUpgrades)) {
      const baseSkillId = skillId.includes('_t') ? skillId.split('_t')[0] : skillId;
      const path = SKILL_EVOLUTION_PATHS[baseSkillId];
      if (!path) continue;
      for (const tier of path.tiers) {
        if (tier.skillId === skillId) {
          for (const upgradeId of selectedIds) {
            const upgrade = tier.upgrades.find(u => u.id === upgradeId);
            if (upgrade) {
              upgrades.push({ skillId, upgrade });
            }
          }
        }
      }
    }
    return upgrades;
  };

  const selectedUpgrades = getAllSelectedUpgrades();

  return (
    <div className="space-y-4">
      {/* Mana Stats */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-blue-400 game-panel-title text-xs flex items-center gap-2">
            <Droplet className="w-4 h-4" />
            Mana Stats
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Base Max Mana:</span>
                <span className="text-gray-200">100</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Well Bonus:</span>
                <span className="text-blue-300">
                  {(() => {
                    const mw = store.skillTiers?.manaWell || 1;
                    const tieredSkillId = mw > 1 ? `manaWell_t${mw}` : 'manaWell';
                    const level = store.skills[tieredSkillId] || store.skills.manaWell || 0;
                    const tierMult = getTierMultiplier(tieredSkillId);
                    return `+${fmt(level * 100 * tierMult)} (${level} lvl × 100 × ${tierMult}x tier)`;
                  })()}
                </span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Prestige Mana Well:</span>
                <span className="text-blue-300">+{fmt((store.prestigeUpgrades.manaWell || 0) * 500)}</span>
              </div>
              {upgradeEffects.maxManaBonus > 0 && (
                <div className="flex justify-between text-sm">
                  <span className="text-amber-400">Upgrade Mana Bonus:</span>
                  <span className="text-amber-300">+{fmt(upgradeEffects.maxManaBonus)}</span>
                </div>
              )}
              {upgradeEffects.maxManaMultiplier > 1 && (
                <div className="flex justify-between text-sm">
                  <span className="text-amber-400">Upgrade Mana Multiplier:</span>
                  <span className="text-amber-300">×{fmtDec(upgradeEffects.maxManaMultiplier, 2)}</span>
                </div>
              )}
              <div className="flex justify-between text-sm font-semibold border-t border-gray-700 pt-2">
                <span className="text-gray-300">Total Max Mana:</span>
                <span className="text-blue-400">{fmt(maxMana)}</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Base Regen:</span>
                <span className="text-gray-200">2/hr</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Flow Bonus:</span>
                <span className="text-blue-300">
                  {(() => {
                    const mf = store.skillTiers?.manaFlow || 1;
                    const tieredSkillId = mf > 1 ? `manaFlow_t${mf}` : 'manaFlow';
                    const level = store.skills[tieredSkillId] || store.skills.manaFlow || 0;
                    const tierMult = getTierMultiplier(tieredSkillId);
                    return `+${fmtDec(level * 1 * tierMult)}/hr (${level} lvl × 1 × ${tierMult}x tier)`;
                  })()}
                </span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Spring Bonus:</span>
                <span className="text-blue-300">+{(store.skills.manaSpring || 0) * 2}/hr</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Prestige Mana Flow:</span>
                <span className="text-blue-300">+{fmtDec((store.prestigeUpgrades.manaFlow || 0) * 0.5)}/hr</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Temporal Echo:</span>
                <span className="text-blue-300">×{fmtDec(1 + (store.prestigeUpgrades.temporalEcho || 0) * 0.1, 2)}</span>
              </div>
              <div className="flex justify-between text-sm font-semibold border-t border-gray-700 pt-2">
                <span className="text-gray-300">Base Regen:</span>
                <span className="text-blue-400">{fmtDec(baseRegen, 2)}/hr</span>
              </div>
              {upgradeEffects.regenBonus > 0 && (
                <div className="flex justify-between text-sm">
                  <span className="text-amber-400">Upgrade Regen Bonus:</span>
                  <span className="text-amber-300">+{fmtDec(upgradeEffects.regenBonus, 2)}/hr</span>
                </div>
              )}
              {upgradeEffects.permanentRegenBonus > 0 && (
                <div className="flex justify-between text-sm">
                  <span className="text-amber-400">Permanent Regen Bonus:</span>
                  <span className="text-amber-300">+{fmtDec(upgradeEffects.permanentRegenBonus, 2)}/hr</span>
                </div>
              )}
              {upgradeEffects.regenMultiplier > 1 && (
                <div className="flex justify-between text-sm">
                  <span className="text-amber-400">Upgrade Regen Multiplier:</span>
                  <span className="text-amber-300">×{fmtDec(upgradeEffects.regenMultiplier, 2)}</span>
                </div>
              )}
            </div>
          </div>
          <Separator className="bg-gray-700 my-3" />
          {upgradeEffects.activeUpgrades.length > 0 && (
            <>
              <div className="mb-2">
                <span className="text-xs text-amber-400 game-panel-title">Active Skill Upgrades</span>
              </div>
              <div className="grid grid-cols-1 md:grid-cols-2 gap-2 mb-3">
                {upgradeEffects.activeUpgrades.map((upgrade, idx) => (
                  <div key={idx} className="flex justify-between text-xs bg-gray-800/50 rounded px-2 py-1">
                    <span className="text-gray-300">{upgrade.name}</span>
                    <span className="text-gray-400">{upgrade.desc}</span>
                  </div>
                ))}
              </div>
              <Separator className="bg-gray-700 my-3" />
            </>
          )}
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Click Mana Value:</span>
                <span className="text-purple-300">+{clickMana}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Tap Bonus:</span>
                <span className="text-purple-300">+{store.skills.manaTap || 0}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Surge Bonus:</span>
                <span className="text-purple-300">+{(store.skills.manaSurge || 0) * 3}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Mana Overflow:</span>
                <span className="text-purple-300">×{fmtDec(1 + (store.skills.manaOverflow || 0) * 0.25, 2)}</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Meditation Multiplier:</span>
                <span className={`font-semibold ${meditationMultiplier > 1.5 ? 'text-purple-400' : 'text-gray-300'}`}>
                  {fmtDec(meditationMultiplier, 2)}x
                </span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Effective Regen:</span>
                <span className="text-green-400 font-semibold">{fmtDec(effectiveRegen, 2)}/hr</span>
              </div>
              {incursionStrength > 0 && !hasSpecial(upgradeEffects, SPECIAL_EFFECTS.STEADY_STREAM) && (
                <div className="flex justify-between text-sm">
                  <span className="text-red-400">Incursion Penalty:</span>
                  <span className="text-red-400">-{Math.round(incursionStrength * 100)}%</span>
                </div>
              )}
              {hasSpecial(upgradeEffects, SPECIAL_EFFECTS.STEADY_STREAM) && incursionStrength > 0 && (
                <div className="flex justify-between text-sm">
                  <span className="text-green-400">Steady Stream:</span>
                  <span className="text-green-400">Immune to incursion</span>
                </div>
              )}
              {manaCascadeBonus > 0 && (
                <div className="flex justify-between text-sm">
                  <span className="text-cyan-400">Mana Cascade Bonus:</span>
                  <span className="text-cyan-400">+{fmtDec(manaCascadeBonus, 2)}/hr</span>
                </div>
              )}
              {hasSpecial(upgradeEffects, SPECIAL_EFFECTS.MANA_TORRENT) && store.rawMana > maxMana * 0.75 && (
                <div className="flex justify-between text-sm">
                  <span className="text-cyan-400">Mana Torrent:</span>
                  <span className="text-cyan-400">+50% regen (high mana)</span>
                </div>
              )}
              {hasSpecial(upgradeEffects, SPECIAL_EFFECTS.DESPERATE_WELLS) && store.rawMana < maxMana * 0.25 && (
                <div className="flex justify-between text-sm">
                  <span className="text-cyan-400">Desperate Wells:</span>
                  <span className="text-cyan-400">+50% regen (low mana)</span>
                </div>
              )}
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Combat Stats */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-red-400 game-panel-title text-xs flex items-center gap-2">
            <Swords className="w-4 h-4" />
            Combat Stats
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Combat Training Bonus:</span>
                <span className="text-red-300">+{(store.skills.combatTrain || 0) * 5}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Arcane Fury Multiplier:</span>
                <span className="text-red-300">×{fmtDec(1 + (store.skills.arcaneFury || 0) * 0.1, 2)}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Elemental Mastery:</span>
                <span className="text-red-300">×{fmtDec(1 + (store.skills.elementalMastery || 0) * 0.15, 2)}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Guardian Bane:</span>
                <span className="text-red-300">×{fmtDec(1 + (store.skills.guardianBane || 0) * 0.2, 2)} (vs guardians)</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Critical Hit Chance:</span>
                <span className="text-amber-300">{((store.skills.precision || 0) * 5)}%</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Critical Multiplier:</span>
                <span className="text-amber-300">1.5x</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Spell Echo Chance:</span>
                <span className="text-amber-300">{((store.skills.spellEcho || 0) * 10)}%</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Pact Multiplier:</span>
                <span className="text-amber-300">×{fmtDec(store.signedPacts.reduce((m, f) => m * (GUARDIANS[f]?.pact || 1), 1), 2)}</span>
              </div>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Study Stats */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-purple-400 game-panel-title text-xs flex items-center gap-2">
            <BookOpen className="w-4 h-4" />
            Study Stats
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Study Speed:</span>
                <span className="text-purple-300">×{fmtDec(studySpeedMult, 2)}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Quick Learner Bonus:</span>
                <span className="text-purple-300">+{((store.skills.quickLearner || 0) * 10)}%</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Study Cost:</span>
                <span className="text-purple-300">{Math.round(studyCostMult * 100)}%</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Focused Mind Bonus:</span>
                <span className="text-purple-300">-{((store.skills.focusedMind || 0) * 5)}%</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Progress Retention:</span>
                <span className="text-purple-300">{Math.round((1 + (store.skills.knowledgeRetention || 0) * 0.2) * 100)}%</span>
              </div>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Element Stats */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-green-400 game-panel-title text-xs flex items-center gap-2">
            <FlaskConical className="w-4 h-4" />
            Element Stats
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Element Capacity:</span>
                <span className="text-green-300">{elemMax}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Elem. Attunement Bonus:</span>
                <span className="text-green-300">
                  {(() => {
                    const ea = store.skillTiers?.elemAttune || 1;
                    const tieredSkillId = ea > 1 ? `elemAttune_t${ea}` : 'elemAttune';
                    const level = store.skills[tieredSkillId] || store.skills.elemAttune || 0;
                    const tierMult = getTierMultiplier(tieredSkillId);
                    return `+${level * 50 * tierMult}`;
                  })()}
                </span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Prestige Attunement:</span>
                <span className="text-green-300">+{(store.prestigeUpgrades.elementalAttune || 0) * 25}</span>
              </div>
            </div>
            <div className="space-y-2">
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Unlocked Elements:</span>
                <span className="text-green-300">{Object.values(store.elements).filter(e => e.unlocked).length} / {Object.keys(ELEMENTS).length}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-gray-400">Elem. Crafting Bonus:</span>
                <span className="text-green-300">×{fmtDec(1 + (store.skills.elemCrafting || 0) * 0.25, 2)}</span>
              </div>
            </div>
          </div>
          <Separator className="bg-gray-700 my-3" />
          <div className="text-xs text-gray-400 mb-2">Elemental Mana Pools:</div>
          <div className="grid grid-cols-4 sm:grid-cols-6 md:grid-cols-8 gap-2">
            {Object.entries(store.elements)
              .filter(([, state]) => state.unlocked)
              .map(([id, state]) => {
                const def = ELEMENTS[id];
                return (
                  <div key={id} className="p-2 rounded border border-gray-700 bg-gray-800/50 text-center">
                    <div className="text-lg">{def?.sym}</div>
                    <div className="text-xs text-gray-400">{state.current}/{state.max}</div>
                  </div>
                );
              })}
          </div>
        </CardContent>
      </Card>

      {/* Active Upgrades */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-amber-400 game-panel-title text-xs flex items-center gap-2">
            <Star className="w-4 h-4" />
            Active Skill Upgrades ({selectedUpgrades.length})
          </CardTitle>
        </CardHeader>
        <CardContent>
          {selectedUpgrades.length === 0 ? (
            <div className="text-gray-500 text-sm">No skill upgrades selected yet. Level skills to 5 or 10 to choose upgrades.</div>
          ) : (
            <div className="grid grid-cols-1 md:grid-cols-2 gap-2">
              {selectedUpgrades.map(({ skillId, upgrade }) => (
                <div key={upgrade.id} className="p-2 rounded border border-amber-600/30 bg-amber-900/10">
                  <div className="flex items-center justify-between">
                    <span className="text-amber-300 text-sm font-semibold">{upgrade.name}</span>
                    <Badge variant="outline" className="text-xs text-gray-400">
                      {SKILLS_DEF[skillId]?.name || skillId}
                    </Badge>
                  </div>
                  <div className="text-xs text-gray-400 mt-1">{upgrade.desc}</div>
                  {upgrade.effect.type === 'multiplier' && (
                    <div className="text-xs text-green-400 mt-1">
                      +{Math.round((upgrade.effect.value! - 1) * 100)}% {upgrade.effect.stat}
                    </div>
                  )}
                  {upgrade.effect.type === 'bonus' && (
                    <div className="text-xs text-blue-400 mt-1">
                      +{upgrade.effect.value} {upgrade.effect.stat}
                    </div>
                  )}
                  {upgrade.effect.type === 'special' && (
                    <div className="text-xs text-cyan-400 mt-1">
                      ⚡ {upgrade.effect.specialDesc || 'Special effect active'}
                    </div>
                  )}
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>

      {/* Pact Bonuses */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-amber-400 game-panel-title text-xs flex items-center gap-2">
            <Trophy className="w-4 h-4" />
            Signed Pacts ({store.signedPacts.length}/10)
          </CardTitle>
        </CardHeader>
        <CardContent>
          {store.signedPacts.length === 0 ? (
            <div className="text-gray-500 text-sm">No pacts signed yet. Defeat guardians to earn pacts.</div>
          ) : (
            <div className="space-y-2">
              {store.signedPacts.map((floor) => {
                const guardian = GUARDIANS[floor];
                if (!guardian) return null;
                return (
                  <div
                    key={floor}
                    className="flex items-center justify-between p-2 rounded border"
                    style={{ borderColor: guardian.color, backgroundColor: `${guardian.color}15` }}
                  >
                    <div>
                      <div className="font-semibold text-sm" style={{ color: guardian.color }}>
                        {guardian.name}
                      </div>
                      <div className="text-xs text-gray-400">Floor {floor}</div>
                    </div>
                    <Badge className="bg-amber-900/50 text-amber-300">
                      {guardian.pact}x multiplier
                    </Badge>
                  </div>
                );
              })}
              <div className="flex justify-between text-sm font-semibold border-t border-gray-700 pt-2 mt-2">
                <span className="text-gray-300">Combined Pact Multiplier:</span>
                <span className="text-amber-400">×{fmtDec(store.signedPacts.reduce((m, f) => m * (GUARDIANS[f]?.pact || 1), 1), 2)}</span>
              </div>
            </div>
          )}
        </CardContent>
      </Card>

      {/* Loop Stats */}
      <Card className="bg-gray-900/80 border-gray-700">
        <CardHeader className="pb-2">
          <CardTitle className="text-purple-400 game-panel-title text-xs flex items-center gap-2">
            <RotateCcw className="w-4 h-4" />
            Loop Stats
          </CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-2xl font-bold text-amber-400 game-mono">{store.loopCount}</div>
              <div className="text-xs text-gray-400">Loops Completed</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-2xl font-bold text-purple-400 game-mono">{fmt(store.insight)}</div>
              <div className="text-xs text-gray-400">Current Insight</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-2xl font-bold text-blue-400 game-mono">{fmt(store.totalInsight)}</div>
              <div className="text-xs text-gray-400">Total Insight</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-2xl font-bold text-green-400 game-mono">{store.maxFloorReached}</div>
              <div className="text-xs text-gray-400">Max Floor</div>
            </div>
          </div>
          <Separator className="bg-gray-700 my-3" />
          <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-xl font-bold text-gray-300 game-mono">{Object.values(store.spells).filter(s => s.learned).length}</div>
              <div className="text-xs text-gray-400">Spells Learned</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-xl font-bold text-gray-300 game-mono">{Object.values(store.skills).reduce((a, b) => a + b, 0)}</div>
              <div className="text-xs text-gray-400">Total Skill Levels</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-xl font-bold text-gray-300 game-mono">{fmt(store.totalManaGathered)}</div>
              <div className="text-xs text-gray-400">Total Mana Gathered</div>
            </div>
            <div className="p-3 bg-gray-800/50 rounded text-center">
              <div className="text-xl font-bold text-gray-300 game-mono">{store.memorySlots}</div>
              <div className="text-xs text-gray-400">Memory Slots</div>
            </div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}