<?php

namespace App\Http\Controllers;

use App\Models\VideoParts;
use App\Models\Videos;
use App\Util\VideoOcrUtil;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller as BaseController;

class OcrConstructController extends BaseController
{
    public function page(Request $request)
    {
        $view = view("ocr.construct.import");
        if ($request->has("video_bvid")) {
            $bvid = $request->get("video_bvid");
            $video = Videos::query()->where("bvid", "=", $bvid)->first();
            if ($video == null) {
                $view->withErrors([
                    "video_bvid" => "系统无此对应视频",
                ]);
            } else {
                $request->session()->flashInput([
                    "video_bvid" => $bvid
                ]);
            }
        }
        return $view;
    }

    public function do_import(Request $request)
    {
        $request->validate([
            'video_bvid' => ['nullable', 'string'],
            'part_num' => ['nullable', 'int', 'min:1'],
            'file.*' => ['required', 'file']
        ]);
        $manualBvid = trim((string)$request->get("video_bvid", ""));
        $manualPartNum = $request->get("part_num");
        $files = $request->file("file");
        if (!is_array($files)) {
            $files = [$files];
        }
        if ($manualBvid !== "" && sizeof($files) > 1) {
            return back()->withInput()->withErrors([
                "file" => "手工指定稿件时一次只能上传一个文件",
            ]);
        }

        $results = [];
        foreach ($files as $file) {
            $results[] = $this->import_one($file, $manualBvid, $manualPartNum);
        }
        return back()->withInput()->with("import_results", $results);
    }

    private function import_one($file, string $manualBvid, $manualPartNum): array
    {
        $name = $file->getClientOriginalName();
        try {
            [$bvid, $partNum] = $this->resolve_target($name, $manualBvid, $manualPartNum);
            $records = VideoOcrUtil::parse_jsonl_records($file->getRealPath());
            $count = VideoOcrUtil::import_records($bvid, $partNum, $records);
            $message = "导入 {$count} 条 → {$bvid} P{$partNum}";
            try {
                VideoOcrUtil::export_to_cdn($bvid, $partNum);
            } catch (\Exception $e) {
                $message .= "（CDN 同步失败：{$e->getMessage()}）";
            }
            return ["file" => $name, "ok" => true, "message" => $message];
        } catch (\Exception $e) {
            return ["file" => $name, "ok" => false, "message" => $e->getMessage()];
        }
    }

    /**
     * 确定导入目标 [bvid, part_num]：手工指定优先，否则按文件名时间戳自动匹配。
     */
    private function resolve_target(string $filename, string $manualBvid, $manualPartNum): array
    {
        if ($manualBvid !== "") {
            $video = Videos::query()->where("bvid", "=", $manualBvid)->first();
            if ($video == null) {
                throw new \InvalidArgumentException("系统无此对应视频：{$manualBvid}");
            }
            if ($manualPartNum !== null && $manualPartNum !== "") {
                return [$manualBvid, (int)$manualPartNum];
            }
            $parts = $video->parts;
            if (sizeof($parts) === 1) {
                return [$manualBvid, (int)$parts[0]->part_num];
            }
            throw new \InvalidArgumentException("该稿件有 " . sizeof($parts) . " 个分P，请手工填写分P号");
        }
        $recordedAt = VideoOcrUtil::parse_jsonl_filename($filename);
        if ($recordedAt === null) {
            throw new \InvalidArgumentException("文件名无法解析录制时间，请手工指定 BVID 与分P");
        }
        $matches = VideoOcrUtil::match_parts($recordedAt);
        if (sizeof($matches) === 0) {
            throw new \InvalidArgumentException("按 {$recordedAt->format("Y-m-d H:i")} 未匹配到分P，请手工指定 BVID 与分P");
        }
        if (sizeof($matches) > 1) {
            $desc = $matches->map(fn(VideoParts $p) => "{$p->bvid} P{$p->part_num}")->implode("、");
            throw new \InvalidArgumentException("匹配到多个分P（{$desc}），请手工指定");
        }
        return [$matches[0]->bvid, (int)$matches[0]->part_num];
    }
}