// ─── Skills Tab ───────────────────────────────────────────────────────────────
// SkillsTab - Displays all skills organized by category
// Refactored: extracted components for better modularity (reduced from 400 lines)

'use client';

import { useState, useCallback } from 'react';
import {
  SKILLS_DEF,
  SKILL_CATEGORIES,
  getStudySpeedMultiplier,
  getStudyCostMultiplier,
} from '@/lib/game/constants';
import {
  SKILL_EVOLUTION_PATHS,
  getUpgradesForSkillAtMilestone,
  getNextTierSkill,
  getTierMultiplier,
} from '@/lib/game/skill-evolution';
import { getUnifiedEffects } from '@/lib/game/effects';
import { getAvailableSkillCategories } from '@/lib/game/data/attunements';
import { fmt, fmtDec } from '@/lib/game/stores';
import type { SkillUpgradeChoice } from '@/lib/game/types';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from '@/components/ui/tooltip';
import { StudyProgress } from './StudyProgress';
import { UpgradeDialog } from './UpgradeDialog';
import { ConfirmDialog } from '@/components/game/ConfirmDialog';
import { useGameToast } from '@/components/game/GameToast';
import { ELEMENTS } from '@/lib/game/constants';
import { ChevronDown, ChevronRight } from 'lucide-react';
import { SkillRow } from './SkillRow';
import { useSkillUpgradeSelection } from '@/lib/game/hooks/useSkillUpgradeSelection';
import { CategorySkillsList } from './CategorySkillsList';
import { useGameStore, useSkillStore, usePrestigeStore } from '@/lib/game/stores';

export function SkillsTab() {
  const showToast = useGameToast();
  const [upgradeDialogSkill, setUpgradeDialogSkill] = useState<string | null>(null);
  const [upgradeDialogMilestone, setUpgradeDialogMilestone] = useState<5 | 10>(5);
  const [collapsedCategories, setCollapsedCategories] = useState<Set<string>>(new Set());
  const [cancelStudyConfirm, setCancelStudyConfirm] = useState<{
    skillId: string;
    skillName: string;
  } | null>(null);

  const skills = useSkillStore((s) => s.skills);
  const skillUpgrades = useSkillStore((s) => s.skillUpgrades);
  const skillTiers = useSkillStore((s) => s.skillTiers);
  const prestigeUpgrades = usePrestigeStore((s) => s.prestigeUpgrades);
  const currentStudyTarget = useGameStore((s) => s.currentStudyTarget);
  const parallelStudyTarget = useGameStore((s) => s.parallelStudyTarget);
  const startStudyingSkill = useSkillStore((s) => s.startStudyingSkill);
  const startParallelStudySkill = useSkillStore((s) => s.startParallelStudySkill);
  const cancelStudy = useGameStore((s) => s.cancelStudy);
  const commitSkillUpgrades = useSkillStore((s) => s.commitSkillUpgrades);
  const tierUpSkill = useSkillStore((s) => s.tierUpSkill);

  const studySpeedMult = getStudySpeedMultiplier({ skills, prestigeUpgrades, skillUpgrades, skillTiers });
  const upgradeEffects = getUnifiedEffects({ skillUpgrades, skillTiers, equippedInstances: {}, equipmentInstances: {} });

  // Upgrade selection hook
  const {
    pendingSelections,
    setPendingSelections,
    toggleUpgrade,
    handleConfirm: hookHandleConfirm,
    handleCancel: hookHandleCancel,
  } = useSkillUpgradeSelection();

  // Toggle category collapse
  const toggleCategory = (categoryId: string) => {
    setCollapsedCategories((prev) => {
      const newSet = new Set(prev);
      if (newSet.has(categoryId)) {
        newSet.delete(categoryId);
      } else {
        newSet.add(categoryId);
      }
      return newSet;
    });
  };

  // Get upgrade choices for dialog
  const getUpgradeChoices = () => {
    if (!upgradeDialogSkill)
      return { available: [] as SkillUpgradeChoice[], selected: [] as string[] };
    const skillDef = SKILLS_DEF[upgradeDialogSkill.includes('_t') ? upgradeDialogSkill.split('_t')[0] : upgradeDialogSkill];
    if (!skillDef) return { available: [] as SkillUpgradeChoice[], selected: [] as string[] };
    return {
      available: getUpgradesForSkillAtMilestone(upgradeDialogSkill, upgradeDialogMilestone),
      selected: skillUpgrades[upgradeDialogSkill] || [],
    };
  };

  const { available, selected: alreadySelected } = getUpgradeChoices();

  // Handle upgrade dialog confirm
  const handleConfirm = () => {
    hookHandleConfirm(
      upgradeDialogSkill!,
      upgradeDialogMilestone,
      (skillId: string, selections: string[], milestone: 5 | 10) => {
        commitSkillUpgrades(skillId, selections, milestone);
        return () => setUpgradeDialogSkill(null);
      }
    );
  };

  // Handle upgrade dialog cancel
  const handleCancel = () => {
    hookHandleCancel(() => setUpgradeDialogSkill(null));
  };

  // Wrapper for upgrade toggle that matches UpgradeDialog's onToggle signature
  const handleUpgradeToggle = useCallback(
    (upgradeId: string) => {
      toggleUpgrade(upgradeId, available, alreadySelected);
    },
    [toggleUpgrade, available, alreadySelected]
  );

  // Handle study start with toast
  const handleStartStudying = (skillId: string) => {
    const skillDef = SKILLS_DEF[skillId.includes('_t') ? skillId.split('_t')[0] : skillId];
    startStudyingSkill(skillId);
    showToast('info', 'Study Started', `Studying ${skillDef?.name || 'skill'}...`);
  };

  // Handle parallel study start with toast
  const handleParallelStudy = (skillId: string) => {
    const skillDef = SKILLS_DEF[skillId.includes('_t') ? skillId.split('_t')[0] : skillId];
    startParallelStudySkill(skillId);
    showToast('info', 'Parallel Study Started', `Studying ${skillDef?.name || 'skill'} in parallel (50% speed)...`);
  };

  // Handle study cancel with confirmation
  const handleCancelStudy = () => {
    const currentTarget = currentStudyTarget;
    if (currentTarget?.type === 'skill') {
      const skillDef = SKILLS_DEF[currentTarget.id.includes('_t') ? currentTarget.id.split('_t')[0] : currentTarget.id];
      setCancelStudyConfirm({
        skillId: currentTarget.id,
        skillName: skillDef?.name || 'Unknown Skill',
      });
    }
  };

  const confirmCancelStudy = () => {
    if (cancelStudyConfirm) {
      cancelStudy();
      showToast(
        'warning',
        'Study Cancelled',
        `${cancelStudyConfirm.skillName} study cancelled. Progress will be partially saved based on your Knowledge Retention skill.`
      );
      setCancelStudyConfirm(null);
    }
  };

  // Get available skill categories based on attunements
  const attunements = useGameStore((s) => s.attunements);
  const availableCategories = getAvailableSkillCategories(attunements || {});

  return (
    <div className="space-y-4">
      {/* Upgrade Selection Dialog */}
      <UpgradeDialog
        open={!!upgradeDialogSkill}
        skillId={upgradeDialogSkill}
        milestone={upgradeDialogMilestone}
        pendingSelections={pendingSelections.length > 0 ? pendingSelections : alreadySelected}
        available={available}
        alreadySelected={alreadySelected}
        onToggle={handleUpgradeToggle}
        onConfirm={handleConfirm}
        onCancel={handleCancel}
        onOpenChange={(open) => {
          if (!open) {
            setPendingSelections([]);
            setUpgradeDialogSkill(null);
          }
        }}
      />

      {/* Cancel Study Confirmation Dialog */}
      {cancelStudyConfirm && (
        <ConfirmDialog
          open={!!cancelStudyConfirm}
          onOpenChange={() => setCancelStudyConfirm(null)}
          title="Cancel Studying?"
          description={`Cancel studying ${cancelStudyConfirm.skillName}? Progress will be partially saved based on your Knowledge Retention skill.`}
          variant="warning"
          confirmText="Cancel Study"
          onConfirm={confirmCancelStudy}
        />
      )}

      {/* Current Study Progress */}
      {currentStudyTarget && currentStudyTarget.type === 'skill' && (
        <Card className="bg-gray-900/80 border-purple-600/50">
          <CardContent className="pt-4">
            <StudyProgress
              currentStudyTarget={currentStudyTarget}
              skills={skills}
              studySpeedMult={studySpeedMult}
              cancelStudy={handleCancelStudy}
            />
          </CardContent>
        </Card>
      )}

      {/* Skill Categories */}
      {SKILL_CATEGORIES.filter((cat) => availableCategories.includes(cat.id)).map((cat) => (
        <CategorySkillsList
          key={cat.id}
          category={cat}
          availableCategories={availableCategories}
          isCollapsed={collapsedCategories.has(cat.id)}
          onToggleCategory={toggleCategory}
          skills={skills}
          skillUpgrades={skillUpgrades}
          skillTiers={skillTiers}
          prestigeUpgrades={prestigeUpgrades}
          studySpeedMult={studySpeedMult}
          upgradeEffects={upgradeEffects}
          currentStudyTarget={currentStudyTarget}
          onStartStudying={handleStartStudying}
          onParallelStudy={handleParallelStudy}
          onCancelStudy={handleCancelStudy}
          onOpenUpgradeDialog={(skillId, milestone) => {
            setUpgradeDialogSkill(skillId);
            setUpgradeDialogMilestone(milestone);
            setPendingSelections([]);
          }}
          onTierUp={(skillId) => tierUpSkill(skillId)}
          pendingSelections={pendingSelections}
          setPendingSelections={setPendingSelections}
        />
      ))}
    </div>
  );
}

SkillsTab.displayName = "SkillsTab";