import { FlaskConical, Lock, Check, Play, ListOrdered, X } from 'lucide-react';
import { TutorialHint } from '@/components/game/TutorialHint';
import { useGameStore } from '@/store';
import { formatDuration, formatPercent, formatNumber, formatMoney } from '@token-empire/shared';
import { TECH_TREE, getAvailableResearch } from '@token-empire/game-engine';
import type { ResearchNode } from '@token-empire/shared';

const CATEGORY_COLORS: Record<string, string> = {
  generation: 'border-purple-500/50 bg-purple-500/10',
  efficiency: 'border-blue-500/50 bg-blue-500/10',
  safety: 'border-green-500/50 bg-green-500/10',
  specialization: 'border-orange-500/50 bg-orange-500/10',
  infrastructure: 'border-cyan-500/50 bg-cyan-500/10',
};

const CATEGORY_LABELS: Record<string, string> = {
  generation: 'Model Architecture',
  efficiency: 'Efficiency',
  safety: 'Safety & Alignment',
  specialization: 'Specialization',
  infrastructure: 'Infrastructure',
};

export function ResearchPage() {
  const completedResearch = useGameStore((s) => s.research.completedResearch);
  const activeResearch = useGameStore((s) => s.research.activeResearch);
  const researchQueue = useGameStore((s) => s.research.researchQueue);
  const researchPoints = useGameStore((s) => s.research.researchPoints);
  const startResearch = useGameStore((s) => s.startResearch);
  const queueResearch = useGameStore((s) => s.queueResearch);
  const removeFromResearchQueue = useGameStore((s) => s.removeFromResearchQueue);
  const era = useGameStore((s) => s.meta.currentEra);

  const state = useGameStore.getState();
  const available = getAvailableResearch(state);
  const availableIds = new Set(available.map(n => n.id));
  const queuedIds = new Set(researchQueue);

  const handleStart = (node: ResearchNode) => {
    if (activeResearch) return;
    startResearch({
      researchId: node.id,
      progressTicks: 0,
      totalTicks: node.cost.ticks,
      allocatedResearchers: state.talent.departments.research.headcount,
      allocatedCompute: node.cost.compute,
      moneySpent: 0,
    });
  };

  const handleQueue = (node: ResearchNode) => {
    queueResearch(node.id);
  };

  const categories = [...new Set(TECH_TREE.map(n => n.category))];

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <h2 className="text-2xl font-bold">Research & Development</h2>
        <div className="flex items-center gap-4 text-sm">
          <div className="text-surface-400">
            Completed: <span className="text-surface-100 font-mono">{completedResearch.length}/{TECH_TREE.length}</span>
          </div>
          <div className="text-surface-400">
            Research Points: <span className="text-accent-light font-mono">{researchPoints}</span>
          </div>
        </div>
      </div>

      <TutorialHint id="research-intro">
        Queue up multiple research projects to run in sequence. Complete prerequisites to unlock advanced technologies that improve your models and infrastructure.
      </TutorialHint>

      {activeResearch && (
        <div className="bg-surface-900 border border-accent/30 rounded-xl p-4">
          <div className="flex items-center justify-between mb-2">
            <div className="flex items-center gap-2">
              <FlaskConical size={16} className="text-accent" />
              <span className="font-medium">
                {TECH_TREE.find(n => n.id === activeResearch.researchId)?.name ?? activeResearch.researchId}
              </span>
            </div>
            <span className="text-sm text-surface-400">
              {formatPercent(activeResearch.progressTicks / activeResearch.totalTicks)} complete
            </span>
          </div>
          <div className="h-2 bg-surface-800 rounded-full overflow-hidden">
            <div
              className="h-full bg-accent rounded-full transition-all duration-300"
              style={{ width: `${(activeResearch.progressTicks / activeResearch.totalTicks) * 100}%` }}
            />
          </div>
          <div className="text-xs text-surface-500 mt-1">
            ETA: {formatDuration(Math.ceil(activeResearch.totalTicks - activeResearch.progressTicks))}
          </div>
        </div>
      )}

      {researchQueue.length > 0 && (
        <div className="bg-surface-900 border border-surface-700 rounded-xl p-4">
          <div className="flex items-center gap-2 mb-3">
            <ListOrdered size={16} className="text-surface-400" />
            <span className="text-sm font-medium text-surface-300">Queue ({researchQueue.length})</span>
          </div>
          <div className="space-y-2">
            {researchQueue.map((id, idx) => {
              const node = TECH_TREE.find(n => n.id === id);
              if (!node) return null;
              return (
                <div key={id} className="flex items-center justify-between bg-surface-800 rounded-lg px-3 py-2">
                  <div className="flex items-center gap-3">
                    <span className="text-xs text-surface-500 font-mono w-5">{idx + 1}.</span>
                    <span className="text-sm">{node.name}</span>
                    <span className="text-xs text-surface-500">{formatDuration(node.cost.ticks)}</span>
                  </div>
                  <button
                    onClick={() => removeFromResearchQueue(id)}
                    className="text-surface-500 hover:text-red-400 transition-colors p-1"
                  >
                    <X size={14} />
                  </button>
                </div>
              );
            })}
          </div>
        </div>
      )}

      {categories.map(category => {
        const nodes = TECH_TREE.filter(n => n.category === category);
        return (
          <div key={category}>
            <h3 className="text-sm font-semibold text-surface-400 uppercase tracking-wider mb-3">
              {CATEGORY_LABELS[category] ?? category}
            </h3>
            <div className="grid grid-cols-2 xl:grid-cols-3 gap-3">
              {nodes.map(node => {
                const isCompleted = completedResearch.includes(node.id);
                const isActive = activeResearch?.researchId === node.id;
                const isQueued = queuedIds.has(node.id);
                const isAvailable = availableIds.has(node.id);
                const isLocked = !isCompleted && !isActive && !isAvailable && !isQueued;
                const canStart = isAvailable && !activeResearch;
                const canQueue = isAvailable && !!activeResearch;
                const queuePosition = isQueued ? researchQueue.indexOf(node.id) + 1 : -1;

                return (
                  <div
                    key={node.id}
                    onClick={() => canStart ? handleStart(node) : canQueue ? handleQueue(node) : undefined}
                    className={`rounded-xl border p-4 transition-all ${
                      isCompleted ? 'border-success/50 bg-success/5 opacity-70' :
                      isActive ? 'border-accent/50 bg-accent/5' :
                      isQueued ? 'border-amber-500/50 bg-amber-500/5' :
                      (canStart || canQueue) ? `${CATEGORY_COLORS[category]} hover:brightness-110 cursor-pointer ring-1 ring-transparent hover:ring-accent/30` :
                      'border-surface-700 bg-surface-900 opacity-50'
                    }`}
                  >
                    <div className="flex items-start justify-between mb-2">
                      <h4 className="font-medium text-sm">{node.name}</h4>
                      {isCompleted && <Check size={16} className="text-success flex-shrink-0" />}
                      {isQueued && <span className="text-xs text-amber-400 font-mono flex-shrink-0">#{queuePosition}</span>}
                      {isLocked && <Lock size={14} className="text-surface-500 flex-shrink-0" />}
                    </div>
                    <p className="text-xs text-surface-400 mb-3">{node.description}</p>
                    <div className="flex items-center justify-between">
                      <div className="text-xs text-surface-500">
                        {formatMoney(node.cost.money)} · {formatDuration(node.cost.ticks)} · {formatNumber(node.cost.compute)} compute
                        {node.cost.researchPoints > 0 && ` · ${node.cost.researchPoints} RP`}
                      </div>
                      {canStart && (
                        <button
                          onClick={(e) => { e.stopPropagation(); handleStart(node); }}
                          className="flex items-center gap-1 bg-accent hover:bg-accent-dark text-white rounded px-2 py-1 text-xs"
                        >
                          <Play size={12} />
                          Start
                        </button>
                      )}
                      {canQueue && (
                        <button
                          onClick={(e) => { e.stopPropagation(); handleQueue(node); }}
                          className="flex items-center gap-1 bg-amber-600 hover:bg-amber-700 text-white rounded px-2 py-1 text-xs"
                        >
                          <ListOrdered size={12} />
                          Queue
                        </button>
                      )}
                      {isQueued && (
                        <button
                          onClick={(e) => { e.stopPropagation(); removeFromResearchQueue(node.id); }}
                          className="flex items-center gap-1 bg-surface-700 hover:bg-red-900 text-surface-300 hover:text-red-300 rounded px-2 py-1 text-xs transition-colors"
                        >
                          <X size={12} />
                          Remove
                        </button>
                      )}
                    </div>
                    {node.prerequisites.length > 0 && isLocked && (
                      <div className="text-xs text-surface-600 mt-2">
                        Requires: {node.prerequisites.map(p =>
                          TECH_TREE.find(n => n.id === p)?.name ?? p
                        ).join(', ')}
                      </div>
                    )}
                  </div>
                );
              })}
            </div>
          </div>
        );
      })}
    </div>
  );
}