<?php

namespace App\Services;

use App\Models\RechargeChannel;
use App\Models\RechargeChannelGroup;
use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Collection;
use RuntimeException;

class PaymentChannelLinkService
{
    public function validate(int $channelId, array $groupIds, int $expectedDataType): array
    {
        $channel = RechargeChannel::query()->find($channelId);
        if (!$channel) throw new RuntimeException('充值通道不存在');
        if ((int)$channel->data_type !== $expectedDataType) {
            throw new RuntimeException($expectedDataType === 2 ? '请选择提现通道' : '请选择充值通道');
        }

        $groupIds = array_values(array_unique(array_filter(array_map('intval', $groupIds))));
        if (!$groupIds) throw new RuntimeException('至少选择一个通道组合');
        $groups = RechargeChannelGroup::query()->whereIn('id', $groupIds)->get();
        if ($groups->count() !== count($groupIds)) throw new RuntimeException('部分通道组合不存在');

        $field = $this->groupField($expectedDataType);
        foreach ($groups as $group) {
            if (!in_array((string)$channel->type, (array)$group->{$field}, true)) {
                throw new RuntimeException("通道组合“{$group->name}”没有包含通道“{$channel->name}”");
            }
        }
        return [$channel, $groupIds];
    }

    public function formatMany($models): Collection
    {
        $models = $models instanceof Collection ? $models : collect($models);
        if ($models instanceof EloquentCollection) $models->loadMissing('rechargeChannel');
        $groupIds = $models->flatMap(fn ($model) => (array)($model->recharge_channel_group_ids ?? []))
            ->map(fn ($id) => (int)$id)->filter()->unique()->values();
        $groups = RechargeChannelGroup::query()->whereIn('id', $groupIds)->get()->keyBy('id');
        return $models->map(fn (Model $model) => $this->formatOne($model, $groups));
    }

    public function formatOne(Model $model, ?Collection $groups = null): array
    {
        $model->loadMissing('rechargeChannel');
        $groups ??= RechargeChannelGroup::query()
            ->whereIn('id', (array)($model->recharge_channel_group_ids ?? []))->get()->keyBy('id');
        $channel = $model->rechargeChannel;
        $assignedIds = array_values(array_unique(array_filter(array_map(
            'intval',
            (array)($model->recharge_channel_group_ids ?? [])
        ))));
        $effectiveIds = [];
        $unavailableIds = [];
        $groupRows = [];
        foreach ($assignedIds as $groupId) {
            $group = $groups->get($groupId);
            $effective = false;
            if ($group && $channel) {
                $effective = in_array(
                    (string)$channel->type,
                    (array)$group->{$this->groupField((int)$channel->data_type)},
                    true
                );
            }
            if ($effective) {
                $effectiveIds[] = $groupId;
            } else {
                $unavailableIds[] = $groupId;
            }
            $groupRows[] = [
                'id' => $groupId,
                'name' => (string)($group->name ?? ''),
                'effective' => $effective ? 1 : 0,
            ];
        }

        $data = $model->toArray();
        $data['recharge_channel_group_ids'] = $assignedIds;
        $data['effective_group_ids'] = $effectiveIds;
        $data['unavailable_group_ids'] = $unavailableIds;
        $data['groups'] = $groupRows;
        $data['recharge_channel'] = $channel ? [
            'id' => (int)$channel->id,
            'data_type' => (int)$channel->data_type,
            'name' => (string)$channel->name,
            'key' => (string)$channel->key,
            'type' => (string)$channel->type,
            'rate' => number_format((float)$channel->rate, 4, '.', ''),
            'fee_rate' => bcmul((string)$channel->rate, '100', 4),
            'min_amount' => $channel->min === null ? null : number_format((float)$channel->min, 2, '.', ''),
            'max_amount' => $channel->max === null ? null : number_format((float)$channel->max, 2, '.', ''),
            'fixed_amounts' => $channel->fixed ?: [],
            'sort' => (int)$channel->sort,
            'status' => (int)$channel->status,
        ] : null;
        $data['fee_rate'] = $channel ? bcmul((string)$channel->rate, '100', 4) : null;
        $data['min_amount'] = $channel?->min;
        $data['max_amount'] = $channel?->max;
        $data['sort'] = $channel ? (int)$channel->sort : null;
        $data['config_status'] = (int)$model->status;
        $data['channel_status'] = $channel ? (int)$channel->status : 0;
        $data['runtime_channel_available'] = $channel
            && (int)$channel->status === 1 && count($effectiveIds) > 0 ? 1 : 0;
        $data['effective_status'] = (int)$model->status === 1
            && $data['runtime_channel_available'] === 1 ? 1 : 0;
        if (array_key_exists('amount', $data)) {
            $data['actual_amount'] = $channel
                ? bcsub((string)$model->amount, bcmul((string)$model->amount, (string)$channel->rate, 6), 2)
                : null;
        }
        $data['channel_fields_readonly'] = [
            'recharge_channel.name', 'recharge_channel.key', 'recharge_channel.type',
            'fee_rate', 'min_amount', 'max_amount', 'recharge_channel.fixed_amounts',
            'sort', 'channel_status',
        ];
        unset($data['level_scope']);
        return $data;
    }

    private function groupField(int $dataType): string
    {
        return match ($dataType) {
            2 => 'withdraw_type',
            3 => 'activity_type',
            default => 'recharge_type',
        };
    }
}