<?php

namespace App\Services\Manage;

use App\Facade\Site;
use App\Libs\Utils;
use Illuminate\Support\Facades\DB;

class ArtStyleService
{
    /**
     * 画风管理列表（分页）
     *
     * @param array $params
     * @return \Illuminate\Contracts\Pagination\LengthAwarePaginator
     */
    public function getList(array $params)
    {
        $this->assertSuperadmin();

        $perPage = (int)getProp($params, 'per_page', 15);
        if ($perPage < 1) {
            $perPage = 15;
        }

        $query = DB::table('mp_art_styles')->where('is_deleted', 0)->select('id', 'art_style', 'prompt', 'character_prefix', 'scene_prefix', 'pic_url', 'is_enabled', 'created_at');

        // 是否启用筛选
        if (array_key_exists('is_enabled', $params) && $params['is_enabled'] !== '' && $params['is_enabled'] !== null) {
            $query->where('is_enabled', (int)$params['is_enabled']);
        }

        // 画风名称模糊筛选
        $keyword = trim((string)getProp($params, 'art_style', ''));
        if ($keyword !== '') {
            $query->where('art_style', 'like', "%{$keyword}%");
        }

        return $query->orderByDesc('id')->paginate($perPage);
    }

    /**
     * 新增画风
     *
     * @param array $params
     * @return array
     */
    public function addArtStyle(array $params): array
    {
        $this->assertSuperadmin();

        $artStyle = trim((string)getProp($params, 'art_style', ''));
        $picUrl   = trim((string)getProp($params, 'pic_url', ''));
        $isEnabled = (int)getProp($params, 'is_enabled', 1);

        if ($artStyle === '') {
            Utils::throwError('1002:请传入画风名称');
        }
        if ($picUrl === '') {
            Utils::throwError('1002:请传入画风图片URL');
        }
        if (trim((string)getProp($params, 'prompt', '')) === '') {
            Utils::throwError('1002:请传入画风提示词prompt');
        }
        if (DB::table('mp_art_styles')->where('art_style', $artStyle)->where('is_deleted', 0)->exists()) {
            Utils::throwError('1002:画风名称已存在');
        }

        $id = DB::table('mp_art_styles')->insertGetId([
            'art_style'       => $artStyle,
            'aliases'         => $this->normalizeAliases($params, $artStyle),
            'prompt'          => trim((string)getProp($params, 'prompt', '')),
            'character_prefix'=> (string)getProp($params, 'character_prefix', ''),
            'scene_prefix'    => (string)getProp($params, 'scene_prefix', ''),
            'pic_url'         => $picUrl,
            'is_enabled'      => $isEnabled,
            'is_deleted'      => 0,
            'created_at'      => date('Y-m-d H:i:s'),
            'updated_at'      => date('Y-m-d H:i:s'),
        ]);

        $row = DB::table('mp_art_styles')->where('id', $id)->first();
        $result = $this->buildStyleResult($row);
        $result['id'] = $id;

        return $result;
    }

    /**
     * 修改画风
     *
     * @param array $params
     * @return array
     */
    public function editArtStyle(array $params): array
    {
        $this->assertSuperadmin();

        $id = (int)getProp($params, 'id', 0);
        if ($id < 1) {
            Utils::throwError('1002:请传入画风ID');
        }

        $row = DB::table('mp_art_styles')->where('id', $id)->where('is_deleted', 0)->first();
        if (!$row) {
            Utils::throwError('20003:画风不存在');
        }

        $update = [];

        $artStyle = trim((string)getProp($params, 'art_style', ''));
        if ($artStyle !== '') {
            if (DB::table('mp_art_styles')->where('art_style', $artStyle)->where('id', '<>', $id)->where('is_deleted', 0)->exists()) {
                Utils::throwError('1002:画风名称已存在');
            }
            $update['art_style'] = $artStyle;
        }

        // 图片URL必填
        $picUrl = trim((string)getProp($params, 'pic_url', ''));
        if ($picUrl === '') {
            Utils::throwError('1002:请传入画风图片URL');
        }
        $update['pic_url'] = $picUrl;

        // prompt 必填（非空）
        $prompt = trim((string)getProp($params, 'prompt', ''));
        if ($prompt === '') {
            Utils::throwError('1002:请传入画风提示词prompt');
        }
        $update['prompt'] = $prompt;

        // aliases 不传时默认使用画风名（新画风名优先，未改则沿用原画风名）
        $defaultAliasStyle = $artStyle !== '' ? $artStyle : (string)$row->art_style;
        $update['aliases'] = $this->normalizeAliases($params, $defaultAliasStyle);

        if (array_key_exists('character_prefix', $params)) {
            $update['character_prefix'] = (string)$params['character_prefix'];
        }
        if (array_key_exists('scene_prefix', $params)) {
            $update['scene_prefix'] = (string)$params['scene_prefix'];
        }
        if (array_key_exists('is_enabled', $params) && $params['is_enabled'] !== '' && $params['is_enabled'] !== null) {
            $update['is_enabled'] = (int)$params['is_enabled'];
        }

        $update['updated_at'] = date('Y-m-d H:i:s');
        DB::table('mp_art_styles')->where('id', $id)->update($update);

        $row = DB::table('mp_art_styles')->where('id', $id)->first();

        return $this->buildStyleResult($row);
    }

    /**
     * 删除画风（软删除 is_deleted=1）
     *
     * @param array $params
     * @return array
     */
    public function deleteArtStyle(array $params)
    {
        $this->assertSuperadmin();

        $id = (int)getProp($params, 'id', 0);
        if ($id < 1) {
            Utils::throwError('1002:请传入画风ID');
        }

        $row = DB::table('mp_art_styles')->where('id', $id)->where('is_deleted', 0)->first();
        if (!$row) {
            Utils::throwError('20003:画风不存在');
        }

        return DB::table('mp_art_styles')->where('id', $id)->update([
            'is_deleted' => 1,
            'updated_at' => date('Y-m-d H:i:s'),
        ]);
        
    }

    /**
     * 规范化别名（支持数组或JSON字符串）
     *
     * @param array $params
     * @return string
     */
    private function normalizeAliases(array $params, string $defaultArtStyle = ''): string
    {
        // 未传 aliases（或为空）时，默认使用画风名本身作为别名
        if (!array_key_exists('aliases', $params) || $params['aliases'] === null || $params['aliases'] === '') {
            return json_encode([$defaultArtStyle], JSON_UNESCAPED_UNICODE);
        }

        $aliases = getProp($params, 'aliases', []);
        if (is_string($aliases)) {
            $aliases = json_decode($aliases, true) ?: [];
        }
        if (!is_array($aliases)) {
            $aliases = [];
        }

        $aliases = array_values(array_filter(array_map('trim', $aliases), function ($item) {
            return $item !== '';
        }));

        return json_encode($aliases, JSON_UNESCAPED_UNICODE);
    }

    /**
     * 仅超管可管理画风
     *
     * @return void
     */
    private function assertSuperadmin(): void
    {
        if (Site::getRole() !== 'superadmin') {
            Utils::throwError('1005:权限不足');
        }
    }

    /**
     * 构建画风返回信息（add/edit 成功后返回）
     *
     * @param object $row
     * @return array
     */
    private function buildStyleResult($row): array
    {
        return [
            'id'               => (int)$row->id,
            'art_style'        => (string)$row->art_style,
            'prompt'           => (string)$row->prompt,
            'character_prefix' => (string)$row->character_prefix,
            'scene_prefix'     => (string)$row->scene_prefix,
            'pic_url'          => (string)$row->pic_url,
            'is_enabled'       => (int)$row->is_enabled,
            'created_at'       => transDate($row->created_at),
        ];
    }
}