<?php

namespace App\Services\Agent;

use App\Models\AdminSite;
use App\Models\AdminUser;
use App\Models\AgentNode;
use App\Support\AdminUserStatus;
use App\Support\AgentPlatformRole;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

final class AgentSiteProvisioningService
{
    public function __construct(
        private readonly AgentProfileService $agentProfileService,
    ) {}

    /**
     * Generate a unique agent code based on site code and counter.
     * Format: {site_code}-agent-{counter}
     */
    private function generateUniqueAgentCode(int $siteId): string
    {
        $site = AdminSite::query()->find($siteId);
        if ($site === null) {
            throw new \RuntimeException('Site not found');
        }

        $prefix = strtolower(trim($site->code));
        $counter = 1;

        while (true) {
            $code = sprintf('%s-agent-%d', $prefix, $counter);
            if (!AgentNode::query()->where('code', $code)->exists()) {
                return $code;
            }
            $counter++;
        }
    }

    /**
     * 在已存在的接入站点上创建一级代理（根节点）及后台登录账号。
     *
     * @param  array<string, mixed>  $payload  site_code, code?, name, username, password, email?, status?, profile fields
     * @return array{site: AdminSite, agent_node: AgentNode}
     */
    public function createRootAgent(AdminUser $actor, array $payload): array
    {
        $siteCode = strtolower(trim((string) ($payload['site_code'] ?? '')));
        $code = strtolower(trim((string) ($payload['code'] ?? '')));
        $name = trim((string) ($payload['name'] ?? ''));
        $username = trim((string) ($payload['username'] ?? ''));
        $password = (string) ($payload['password'] ?? '');
        $email = isset($payload['email']) ? trim((string) $payload['email']) : null;
        $status = (int) ($payload['status'] ?? 1);

        if ($siteCode === '' || $name === '' || $username === '' || $password === '') {
            throw ValidationException::withMessages([
                'site_code' => $siteCode === '' ? ['required'] : [],
                'name' => $name === '' ? ['required'] : [],
                'username' => $username === '' ? ['required'] : [],
                'password' => $password === '' ? ['required'] : [],
            ]);
        }

        $site = AdminSite::query()->where('code', $siteCode)->first();
        if ($site === null) {
            throw ValidationException::withMessages(['site_code' => ['exists']]);
        }

        // Auto-generate code if not provided
        if ($code === '') {
            $code = $this->generateUniqueAgentCode($site->id);
        } else {
            if (AgentNode::query()->where('code', $code)->exists()) {
                throw ValidationException::withMessages(['code' => ['unique']]);
            }
        }

        if (AdminUser::query()->where('username', $username)->exists()) {
            throw ValidationException::withMessages(['username' => ['unique']]);
        }

        $existingRoot = AgentNode::query()
            ->where('admin_site_id', $site->id)
            ->where('depth', 0)
            ->first();

        if ($existingRoot !== null) {
            throw ValidationException::withMessages([
                'site_code' => ['site_root_exists'],
            ]);
        }

        return DB::transaction(function () use ($actor, $site, $code, $name, $username, $password, $email, $status, $payload): array {
            $node = AgentNode::query()->create([
                'admin_site_id' => $site->id,
                'parent_id' => null,
                'path' => '/',
                'depth' => 0,
                'code' => $code,
                'name' => $name,
                'status' => $status === 0 ? 0 : 1,
                'created_by' => $actor->id,
                'extra_json' => null,
            ]);
            $node->path = '/'.$node->id.'/';
            $node->save();

            AgentPlatformRole::resolve();

            $user = AdminUser::query()->create([
                'username' => $username,
                'name' => $name,
                'email' => $email !== '' ? $email : null,
                'password' => $password,
                'status' => AdminUserStatus::fromAgentNodeStatus($status === 0 ? 0 : 1),
            ]);

            DB::table('admin_user_agents')->insert([
                'admin_user_id' => $user->id,
                'agent_node_id' => $node->id,
                'is_primary' => true,
                'granted_at' => now(),
            ]);
            AgentPlatformRole::assignPrimaryOperator($user, $node);

            $defaults = config('agent_line_defaults', []);
            // rebate_limit / default_player_rebate 在 DB 存储为小数（0-1），但 controller 与 field rules
            // 按百分比（0-100）入参，upsertForNode 内部会做 /100；故透传 config 默认值时需 *100 转回。
            $defaultRebateLimitPct = isset($defaults['rebate_limit']) ? (float) $defaults['rebate_limit'] * 100 : 0.0;
            $defaultPlayerRebatePct = isset($defaults['default_player_rebate']) ? (float) $defaults['default_player_rebate'] * 100 : 0.0;
            $this->agentProfileService->upsertForNode($node, [
                'total_share_rate' => (float) ($payload['total_share_rate'] ?? $defaults['total_share_rate'] ?? 100),
                'credit_limit' => (int) ($payload['credit_limit'] ?? $defaults['credit_limit'] ?? 0),
                'rebate_limit' => array_key_exists('rebate_limit', $payload)
                    ? (float) $payload['rebate_limit']
                    : $defaultRebateLimitPct,
                'default_player_rebate' => array_key_exists('default_player_rebate', $payload)
                    ? (float) $payload['default_player_rebate']
                    : $defaultPlayerRebatePct,
                'can_grant_extra_rebate' => (bool) ($payload['can_grant_extra_rebate'] ?? true),
                'can_create_child_agent' => (bool) ($payload['can_create_child_agent'] ?? true),
                'can_create_player' => (bool) ($payload['can_create_player'] ?? true),
            ]);

            return [
                'site' => $site->fresh(),
                'agent_node' => $node->fresh(['adminSite']),
            ];
        });
    }
}
