<?php

namespace App\Http\Controllers\System;

use App\Http\Controllers\Controller;
use App\Models\System\AiTokenUsage;
use App\Models\Tenants\Tenant;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\View\View;

class AiTokenUsageController extends Controller
{
    public function index(Request $request): View|Response
    {
        if ($request->header('HX-Request')) {
            return response('', 200)->header('HX-Redirect', route('system.ai-token-usage.index'));
        }

        return view('system.ai-token-usage.index');
    }

    public function list(Request $request): JsonResponse
    {
        $perPage = $request->input('per_page', 20);
        $startDate = $request->input('start_date');
        $endDate = $request->input('end_date');
        $tenantId = $request->input('tenant_id');
        $menuName = $request->input('menu_name');

        $query = AiTokenUsage::query()
            ->orderByDesc('created_at');

        if ($tenantId) {
            $query->where('tenant_id', $tenantId);
        }

        if ($menuName) {
            $query->where('menu_name', $menuName);
        }

        if ($startDate) {
            $query->whereDate('created_at', '>=', $startDate);
        }

        if ($endDate) {
            $query->whereDate('created_at', '<=', $endDate);
        }

        // 통계 (필터 조건 동일하게 적용)
        $statsQuery = clone $query;
        $stats = $statsQuery->selectRaw('
            COUNT(*) as total_count,
            SUM(prompt_tokens) as total_prompt_tokens,
            SUM(completion_tokens) as total_completion_tokens,
            SUM(total_tokens) as total_total_tokens,
            SUM(cost_usd) as total_cost_usd,
            SUM(cost_krw) as total_cost_krw
        ')->first();

        // 페이지네이션
        $records = $query->paginate($perPage);

        // 테넌트 이름 매핑
        $tenantIds = $records->pluck('tenant_id')->unique();
        $tenants = Tenant::whereIn('id', $tenantIds)->pluck('company_name', 'id');

        $data = $records->through(function ($item) use ($tenants) {
            return [
                'id' => $item->id,
                'tenant_id' => $item->tenant_id,
                'tenant_name' => $tenants[$item->tenant_id] ?? '-',
                'model' => $item->model,
                'menu_name' => $item->menu_name,
                'prompt_tokens' => $item->prompt_tokens,
                'completion_tokens' => $item->completion_tokens,
                'total_tokens' => $item->total_tokens,
                'cost_usd' => (float) $item->cost_usd,
                'cost_krw' => (float) $item->cost_krw,
                'request_id' => $item->request_id,
                'created_at' => $item->created_at->format('Y-m-d H:i:s'),
            ];
        });

        // 필터용 메뉴 목록
        $menuNames = AiTokenUsage::select('menu_name')
            ->distinct()
            ->orderBy('menu_name')
            ->pluck('menu_name');

        // 필터용 테넌트 목록
        $allTenantIds = AiTokenUsage::select('tenant_id')
            ->distinct()
            ->pluck('tenant_id');
        $allTenants = Tenant::whereIn('id', $allTenantIds)
            ->orderBy('company_name')
            ->get(['id', 'company_name']);

        return response()->json([
            'success' => true,
            'data' => $data->items(),
            'stats' => [
                'total_count' => (int) ($stats->total_count ?? 0),
                'total_prompt_tokens' => (int) ($stats->total_prompt_tokens ?? 0),
                'total_completion_tokens' => (int) ($stats->total_completion_tokens ?? 0),
                'total_total_tokens' => (int) ($stats->total_total_tokens ?? 0),
                'total_cost_usd' => round((float) ($stats->total_cost_usd ?? 0), 6),
                'total_cost_krw' => round((float) ($stats->total_cost_krw ?? 0), 2),
            ],
            'filters' => [
                'menu_names' => $menuNames,
                'tenants' => $allTenants->map(fn ($t) => ['id' => $t->id, 'name' => $t->company_name]),
            ],
            'pagination' => [
                'current_page' => $records->currentPage(),
                'last_page' => $records->lastPage(),
                'per_page' => $records->perPage(),
                'total' => $records->total(),
            ],
        ]);
    }
}