<?php

namespace App\Services;

use App\Models\PromotionActivity;
use App\Services\Sharing\ShareDefaults;
use App\Support\PromotionRules;
use App\Support\PromotionTranslations;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\ValidationException;

class PromotionAdminService
{
    public function options(): array
    {
        $types = []; foreach (PromotionRules::types() as $value => $label) $types[] = compact('value', 'label');
        return ['types' => $types, 'languages' => [['value' => 'zh', 'label' => '中文'], ['value' => 'en', 'label' => '英文'], ['value' => 'vi', 'label' => '越南文']],
            'create_types' => [['value' => PromotionRules::FIRST_DEPOSIT, 'label' => PromotionRules::types()[PromotionRules::FIRST_DEPOSIT]]],
            'defaults' => [7 => PromotionRules::defaults(7), 8 => PromotionRules::defaults(8), 9 => PromotionRules::defaults(9)],
            'prizes' => PromotionRules::PRIZES, 'tasks' => PromotionRules::TASKS,
            'reward_modes' => [['value' => 'cash', 'label' => '现金'], ['value' => 'coupon', 'label' => '优惠券']],
            'coupon_categories' => array_map(fn ($value) => ['value' => $value, 'label' => ShareDefaults::categories()[$value]], PromotionRules::COUPON_CATEGORIES)];
    }

    public function listing(array $input): array
    {
        $input = Validator::make($input, ['page' => ['sometimes', 'integer', 'min:1'], 'limit' => ['sometimes', 'integer', 'between:1,100'],
            'type' => ['sometimes', 'integer', 'in:7,8,9'], 'status' => ['sometimes', 'integer', 'in:0,1'], 'title' => ['sometimes', 'string', 'max:140']])->validate();
        $q = PromotionActivity::query();
        foreach (['type', 'status'] as $key) if (isset($input[$key])) $q->where($key, $input[$key]);
        if (!empty($input['title'])) $q->where('title', 'like', '%' . $input['title'] . '%');
        return ['total' => $q->count(), 'data' => $q->orderByDesc('sort')->orderByDesc('id')->forPage($input['page'] ?? 1, $input['limit'] ?? 20)->get()->map(fn ($r) => $this->format($r))->all()];
    }

    /** Fixed activities (loss invite, wheel) have one row, so the flat edit form can load it by type alone. */
    public function detail(?int $id, ?int $type = null): array
    {
        if ($id === null && !in_array($type, [PromotionRules::LOSS, PromotionRules::WHEEL], true)) {
            throw ValidationException::withMessages(['type' => '仅净亏邀请和转盘活动可按type读取']);
        }
        $row = $id !== null ? PromotionActivity::find($id) : PromotionActivity::where('type', $type)->orderBy('id')->first();
        if (!$row) throw ValidationException::withMessages(['id' => '独立活动不存在']);
        return $this->format($row);
    }

    private function format(PromotionActivity $row): array
    {
        $data = array_replace($row->toArray(), ['translations' => PromotionTranslations::all($row->toArray()), 'params' => json_decode($row->params, true),
            'start_time' => date('Y-m-d H:i:s', (int)$row->start_time), 'end_time' => date('Y-m-d H:i:s', (int)$row->end_time),
            'first_published_at' => DB::table('promotion_campaigns')->where('activity_id', $row->id)->value('first_published_at')]);
        unset($data['sub_title']);
        if (in_array((int) $row->type, [PromotionRules::LOSS, PromotionRules::WHEEL], true)) unset($data['image']);
        return $data;
    }

    public function save(array $input): array
    {
        unset($input['sub_title']);
        if (isset($input['translations']) && is_array($input['translations'])) {
            foreach ($input['translations'] as &$text) if (is_array($text)) unset($text['sub_title']);
            unset($text);
        }
        if (in_array($input['type'] ?? null, [7, 9, '7', '9'], true)) unset($input['image']);
        $money = ['nullable', 'numeric', 'min:0', 'regex:/^\d{1,12}(\.\d{1,2})?$/'];
        $textRules = ['translations' => ['required', 'array:zh,en,vi']];
        $messages = ['translations.required' => '请完整填写中文、英文、越南文的标题和正文'];
        foreach (['zh' => '中文', 'en' => '英文', 'vi' => '越南文'] as $lang => $label) {
            $textRules['translations.' . $lang] = ['required', 'array:title,content'];
            $messages['translations.' . $lang . '.required'] = '请完整填写' . $label . '文本';
            foreach (['title' => ['标题', 140], 'content' => ['正文', 100000]] as $field => [$name, $max]) {
                $key = 'translations.' . $lang . '.' . $field;
                $textRules[$key] = ['required', 'string', 'max:' . $max];
                $messages[$key . '.required'] = $label . $name . '不能为空';
            }
        }
        $data = Validator::make($input, $textRules + ['id' => ['sometimes', 'integer', 'min:1'],
            'type' => ['required', 'integer', 'in:7,8,9'], 'status' => ['required', 'integer', 'in:0,1'],
            'start_time' => ['required', 'date'], 'end_time' => ['required', 'date', 'after:start_time'],
            'sort' => ['sometimes', 'integer', 'between:0,4294967295'], 'params' => ['sometimes', 'array'],
            'image' => ['sometimes', 'nullable', 'string', 'max:2048'], 'publish_platforms' => ['sometimes', 'array'], 'publish_platforms.*' => ['string', 'distinct', 'in:PC,H5,APP'],
            'register_time_limited' => ['sometimes', 'boolean'], 'register_start_time' => ['nullable', 'required_if:register_time_limited,1', 'date'],
            'register_end_time' => ['nullable', 'required_if:register_time_limited,1', 'date', 'after_or_equal:register_start_time'],
            'register_platforms' => ['sometimes', 'array'], 'register_platforms.*' => ['string', 'distinct', 'in:PC,H5,APP'], 'deposit_limited' => ['sometimes', 'boolean'],
            'deposit_min' => [...$money, 'required_if:deposit_limited,1'], 'deposit_max' => [...$money, 'required_if:deposit_limited,1', 'gte:deposit_min'],
            'show_ineligible' => ['sometimes', 'boolean'], 'reward_quota' => ['sometimes', 'nullable', 'integer', 'between:0,2147483647'], 'budget' => ['sometimes', ...$money]], $messages)->validate();
        if (!isset($data['id']) && in_array((int) $data['type'], [PromotionRules::LOSS, PromotionRules::WHEEL], true)) {
            throw ValidationException::withMessages(['id' => '净亏和转盘活动不支持新增，请编辑现有活动']);
        }
        return DB::transaction(function () use ($data) {
            $row = isset($data['id']) ? PromotionActivity::where('id', $data['id'])->lockForUpdate()->first() : new PromotionActivity();
            if (!$row) throw ValidationException::withMessages(['id' => '独立活动不存在']);
            if ($row->exists && (int)$row->type !== (int)$data['type']) throw ValidationException::withMessages(['type' => '创建后不能变更活动类型']);
            $before = $row->exists ? $row->toArray() : [];
            $params = array_replace($row->params ? json_decode($row->params, true) : [], $data['params'] ?? []);
            $values = $data; unset($values['id']);
            $texts = $this->completeTexts($data['translations']);
            $values = array_replace($values, $texts['zh'], ['translations' => $texts, 'lang' => 'zh']);
            $values['params'] = json_encode(PromotionRules::normalize((int)$data['type'], $params));
            $values['start_time'] = strtotime($data['start_time']); $values['end_time'] = strtotime($data['end_time']);
            if ((int)$values['status'] === 1 && $values['end_time'] < now()->timestamp) throw ValidationException::withMessages(['end_time' => '活动已结束，不能上架']);
            if (!$row->exists) $values += ['lang' => 'zh', 'sort' => 0, 'publish_platforms' => [], 'register_platforms' => []];
            $row->fill($values); $row->save(); PromotionService::publish($row);
            if (Schema::hasTable('operation_audits')) OperationAuditService::record('promotion', $row->id, $before ? 'update' : 'create', $before, $row->toArray());
            return $this->format($row);
        }, 3);
    }

    private function completeTexts(array $texts): array
    {
        foreach (['zh' => '中文', 'en' => '英文', 'vi' => '越南文'] as $lang => $label) {
            foreach (['title' => '标题', 'content' => '正文'] as $field => $name) {
                $value = html_entity_decode(strip_tags($texts[$lang][$field]), ENT_QUOTES | ENT_HTML5, 'UTF-8');
                if (preg_replace('/[\s\p{Z}\x{200B}\x{FEFF}]+/u', '', $value) === '') {
                    throw ValidationException::withMessages(['translations.' . $lang . '.' . $field => $label . $name . '不能为空']);
                }
                if ($field !== 'content') $texts[$lang][$field] = trim($texts[$lang][$field]);
            }
        }
        return $texts;
    }

    public function status(int $id, int $status): array
    {
        return DB::transaction(function () use ($id, $status) {
            $row = PromotionActivity::where('id', $id)->lockForUpdate()->first();
            if (!$row) throw ValidationException::withMessages(['id' => '独立活动不存在']);
            if ($status === 1) $this->completeTexts(PromotionTranslations::all($row->toArray()));
            if ($status === 1 && (int)$row->end_time < now()->timestamp) throw ValidationException::withMessages(['end_time' => '活动已结束，不能上架']);
            $before = $row->toArray(); $row->status = $status; $row->save(); PromotionService::publish($row);
            if (Schema::hasTable('operation_audits')) OperationAuditService::record('promotion', $id, 'status', $before, $row->toArray());
            return $this->format($row);
        }, 3);
    }

    /** Takes ended activities off the shelf; each change is audited like a manual status switch. */
    public static function expire(): int
    {
        $expired = 0;
        foreach (PromotionActivity::where('status', 1)->where('end_time', '<', now()->timestamp)->pluck('id') as $id) {
            $expired += DB::transaction(function () use ($id) {
                $row = PromotionActivity::where('id', $id)->lockForUpdate()->first();
                if (!$row || (int)$row->status !== 1 || (int)$row->end_time >= now()->timestamp) return 0;
                $before = $row->toArray(); $row->status = 0; $row->save();
                if (Schema::hasTable('operation_audits')) OperationAuditService::record('promotion', $id, 'expire', $before, $row->toArray(), null, ['operator_id' => null, 'operator_name' => '系统']);
                return 1;
            }, 3);
        }
        return $expired;
    }

    public function records(array $input): array
    {
        $input = Validator::make($input, ['activity_id' => ['required', 'integer', 'min:1'], 'user_id' => ['sometimes', 'integer', 'min:1'],
            'kind' => ['required', 'in:accounts,rounds,tasks,spins,rewards,coupons'], 'status' => ['sometimes', 'in:unused,used'],
            'page' => ['sometimes', 'integer', 'min:1'], 'limit' => ['sometimes', 'integer', 'between:1,100']])->validate();
        if ($input['kind'] === 'coupons') {
            // Invitee coupons belong to the invitee, so they are found by activity rather than by the inviter's account.
            $q = DB::table('promotion_coupons')->where('activity_id', $input['activity_id']);
            if (isset($input['user_id'])) $q->where(fn ($q) => $q->where('user_id', $input['user_id'])->orWhere('inviter_user_id', $input['user_id']));
            if (isset($input['status'])) $q->where('status', $input['status']);
            $rows = (clone $q)->orderByDesc('id')->forPage($input['page'] ?? 1, $input['limit'] ?? 20)->get()
                ->map(function ($row) { $row->categories = json_decode($row->categories, true); return $row; });
            $accounts = $this->recordAccounts($rows->flatMap(fn ($row) => [$row->user_id, $row->inviter_user_id])->all());
            foreach ($rows as $row) {
                $row->account = $accounts[(int)$row->user_id] ?? null;
                $row->inviter_account = $accounts[(int)$row->inviter_user_id] ?? null;
            }
            return ['total' => $q->count(), 'data' => $rows];
        }
        $q = DB::table('promotion_accounts as a')->where('a.activity_id', $input['activity_id']);
        if (isset($input['user_id'])) $q->where('a.user_id', $input['user_id']);
        if ($input['kind'] === 'accounts') $q->select('a.*')->orderByDesc('a.id');
        else {
            $table = match ($input['kind']) { 'rounds' => 'promotion_rounds', 'tasks' => 'promotion_task_grants', 'spins' => 'promotion_spins', 'rewards' => 'promotion_rewards' };
            $q->join($table . ' as r', 'r.account_id', '=', 'a.id')->select(['r.*', 'a.user_id', 'a.activity_id'])->orderByDesc('r.id');
        }
        $total = (clone $q)->count();
        $rows = $q->forPage($input['page'] ?? 1, $input['limit'] ?? 20)->get();
        if (in_array($input['kind'], ['accounts', 'rewards'], true) && $rows->isNotEmpty()
            && (int)DB::table('promotion_activities')->where('id', $input['activity_id'])->value('type') === PromotionRules::LOSS) {
            $this->lossRecordPeople($rows, $input['kind']);
        }
        return ['total' => $total, 'data' => $rows];
    }

    /** Loss-invite record display only: historical recipients and actual issued coupon quantities. */
    private function lossRecordPeople($rows, string $kind): void
    {
        $rewards = $kind === 'rewards' ? $rows : DB::table('promotion_rewards')->whereIn('account_id', $rows->pluck('id'))
            ->where('round_no', 1)->get();
        $byAccount = $rewards->keyBy('account_id');
        $couponRewards = $rewards->filter(fn ($reward) => ($this->recordSnapshot($reward->rule_snapshot)['reward_mode'] ?? 'cash') === 'coupon');
        $groups = $couponRewards->isEmpty() ? collect() : DB::table('promotion_coupons')->whereIn('reward_id', $couponRewards->pluck('id'))
            ->select(['reward_id', 'user_id', 'role', 'min_amount', 'discount'])->selectRaw('COUNT(*) AS quantity')
            ->groupBy('reward_id', 'user_id', 'role', 'min_amount', 'discount')->orderBy('min_amount')->orderBy('discount')->get();
        $coupons = $issuedInvitees = [];
        $people = $rows->pluck('user_id')->all();
        foreach ($groups as $group) {
            $coupons[(int)$group->reward_id][(int)$group->user_id][$group->role][] = [
                'min_amount' => bcadd((string)$group->min_amount, '0', 2), 'discount' => bcadd((string)$group->discount, '0', 2), 'quantity' => (int)$group->quantity,
            ];
            if ($group->role === 'invitee') $issuedInvitees[(int)$group->reward_id][] = (int)$group->user_id;
            $people[] = (int)$group->user_id;
        }
        $contexts = [];
        foreach ($rows as $row) {
            $reward = $kind === 'rewards' ? $row : $byAccount->get($row->id);
            $application = $this->recordSnapshot($row->application_snapshot ?? null);
            $rules = $reward ? $this->recordSnapshot($reward->rule_snapshot) : ($application['rules'] ?? []);
            if (!is_array($rules)) $rules = [];
            $mode = ($reward || $rules) ? ($rules['reward_mode'] ?? 'cash') : null;
            $ids = $mode === 'coupon' && isset($rules['coupon_invitees']) ? $rules['coupon_invitees'] : ($rules['qualified_invitees'] ?? []);
            $ids = $this->recordIds(array_merge(is_array($ids) ? $ids : [], $issuedInvitees[(int)($reward->id ?? 0)] ?? []));
            $contexts[] = [$row, $reward, in_array($mode, ['cash', 'coupon'], true) ? $mode : null, $ids];
            $people = array_merge($people, $ids);
        }
        $accounts = $this->recordAccounts($people);
        foreach ($contexts as [$row, $reward, $mode, $ids]) {
            $rewardId = (int)($reward->id ?? 0); $owner = (int)$row->user_id;
            $row->reward_mode = $mode;
            if ($kind === 'accounts') {
                $row->reward_id = $reward ? (int)$reward->id : null;
                $row->reward_status = $reward ? $reward->status : null;
            }
            $row->inviter = ['id' => $owner, 'account' => $accounts[$owner] ?? null, 'coupons' => $coupons[$rewardId][$owner]['inviter'] ?? []];
            $row->invitees = array_map(fn ($id) => ['id' => $id, 'account' => $accounts[$id] ?? null,
                'coupons' => $coupons[$rewardId][$id]['invitee'] ?? []], $ids);
        }
    }

    private function recordSnapshot($value): array
    {
        $value = is_string($value) ? json_decode($value, true) : $value;
        return is_array($value) ? $value : [];
    }

    private function recordIds(array $ids): array
    {
        $valid = [];
        foreach ($ids as $id) {
            $id = is_int($id) || is_string($id) ? filter_var($id, FILTER_VALIDATE_INT) : false;
            if ($id !== false && $id > 0) $valid[$id] = $id;
        }
        return array_values($valid);
    }

    private function recordAccounts(array $ids): array
    {
        $accounts = [];
        foreach (array_chunk($this->recordIds($ids), 1000) as $chunk) {
            foreach (DB::table('users')->whereIn('id', $chunk)->get(['id', 'account']) as $user) {
                $accounts[(int)$user->id] = $user->account === null || $user->account === '' ? null : (string)$user->account;
            }
        }
        return $accounts;
    }
}