<?php

namespace App\Http\Controllers\Admin;

use App\DB\Te\TableEngine;
use App\Http\Controllers\Controller;
use App\Models\Automation;
use App\Services\Automation\AutomationCatalog;
use App\Services\Automation\AutomationEngine;
use App\Services\Automation\AutomationFingerprint;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;

class AutomationController extends Controller
{
    public function table(Request $request)
    {
        $query = Automation::query();
        TableEngine::create($query, $request->all())
            ->initSearch(['name', 'code', 'title', 'body'])
            ->select(['*'])
            ->export($query);

        return $query;
    }

    public function catalog()
    {
        return response()->json(app(AutomationCatalog::class)->toArray());
    }

    public function preview(Request $request)
    {
        $conditions = array_values((array) $request->input('conditions', []));
        $count = app(AutomationEngine::class)->previewCount($conditions);

        return response()->json(['count' => $count]);
    }

    public function store(Request $request)
    {
        $data = $this->validated($request);
        $data['created_by'] = auth()->id();
        $row = Automation::create($data);

        return response()->json($row);
    }

    public function update(Request $request, $id)
    {
        $row = Automation::query()->findOrFail($id);
        $data = $this->validated($request, (int) $row->id);
        $row->fill($data)->save();

        return response()->json($row);
    }

    public function toggle($id)
    {
        $row = Automation::query()->findOrFail($id);
        if (! $row->is_active) {
            $dup = $this->duplicateOf($row->logic_fingerprint, (int) $row->id, true);
            if ($dup) {
                throw new UnprocessableEntityHttpException(
                    'اتوماسیون مشابه فعال است: '.$dup->name
                );
            }
        }
        $row->is_active = ! $row->is_active;
        $row->save();

        return response()->json(['is_active' => $row->is_active]);
    }

    public function destroy($id)
    {
        Automation::query()->findOrFail($id)->delete();

        return response()->json(true);
    }

    private function validated(Request $request, ?int $ignoreId = null): array
    {
        $name = trim((string) $request->input('name', ''));
        $title = trim((string) $request->input('title', ''));
        $body = trim((string) $request->input('body', ''));
        if ($name === '' || $title === '' || $body === '') {
            throw new UnprocessableEntityHttpException('نام، عنوان و متن الزامی است.');
        }

        $triggerType = (string) $request->input('trigger_type', AutomationCatalog::TRIGGER_SCHEDULE);
        if (! in_array($triggerType, [
            AutomationCatalog::TRIGGER_SCHEDULE,
            AutomationCatalog::TRIGGER_EVENT,
            AutomationCatalog::TRIGGER_PRICE,
        ], true)) {
            throw new UnprocessableEntityHttpException('نوع تریگر نامعتبر است.');
        }

        $channels = array_values(array_intersect(
            (array) $request->input('channels', []),
            [AutomationCatalog::CHANNEL_SMS, AutomationCatalog::CHANNEL_IN_APP]
        ));
        if ($channels === []) {
            throw new UnprocessableEntityHttpException('حداقل یک کانال انتخاب کنید.');
        }

        $smsHour = $request->input('sms_send_hour');
        $inAppHour = $request->input('in_app_send_hour');
        if (in_array(AutomationCatalog::CHANNEL_SMS, $channels, true) && $smsHour === null) {
            throw new UnprocessableEntityHttpException('ساعت ارسال پیامک را مشخص کنید.');
        }
        if (in_array(AutomationCatalog::CHANNEL_IN_APP, $channels, true) && $inAppHour === null) {
            throw new UnprocessableEntityHttpException('ساعت ارسال اعلان را مشخص کنید.');
        }

        $conditions = array_values(array_filter(
            (array) $request->input('conditions', []),
            fn ($row) => is_array($row) && filled($row['field'] ?? null)
        ));
        $catalog = app(AutomationCatalog::class);
        $allowed = $catalog->fieldKeys();
        foreach ($conditions as $row) {
            if (! in_array($row['field'] ?? '', $allowed, true)) {
                throw new UnprocessableEntityHttpException('شرط نامعتبر است.');
            }
        }

        $triggerConfig = (array) $request->input('trigger_config', []);
        if ($triggerType === AutomationCatalog::TRIGGER_SCHEDULE) {
            $triggerConfig = [];
        } elseif ($triggerType === AutomationCatalog::TRIGGER_EVENT) {
            $eventKeys = array_column(AutomationCatalog::EVENTS, 'key');
            if (! in_array((string) ($triggerConfig['event'] ?? ''), $eventKeys, true)) {
                throw new UnprocessableEntityHttpException('رویداد را انتخاب کنید.');
            }
            $triggerConfig = [
                'event' => (string) $triggerConfig['event'],
                'delay_hours' => max(0, (int) ($triggerConfig['delay_hours'] ?? 0)),
            ];
        } elseif ($triggerType === AutomationCatalog::TRIGGER_PRICE) {
            $step = (float) str_replace(',', '', (string) ($triggerConfig['step_toman'] ?? 0));
            if ($step <= 0) {
                throw new UnprocessableEntityHttpException('رقم تغییر قیمت باید بزرگ‌تر از صفر باشد.');
            }
            $dir = (string) ($triggerConfig['direction'] ?? 'both');
            if (! in_array($dir, ['up', 'down', 'both'], true)) {
                $dir = 'both';
            }
            $triggerConfig = [
                'step_toman' => $step,
                'direction' => $dir,
                'product_id' => (int) ($triggerConfig['product_id'] ?? 0) ?: null,
            ];
        }

        $fingerprint = app(AutomationFingerprint::class)->make($triggerType, $triggerConfig, $conditions);
        $dup = $this->duplicateOf($fingerprint, $ignoreId, false);
        if ($dup) {
            throw new UnprocessableEntityHttpException(
                'اتوماسیون شبیه وجود دارد: '.$dup->name.' — همان را ویرایش کنید.'
            );
        }

        $starts = $request->input('starts_at') ?: null;
        $ends = $request->input('ends_at') ?: null;

        return [
            'name' => $name,
            'code' => $this->uniqueCode($name, $ignoreId),
            'is_active' => (bool) $request->input('is_active', true),
            'starts_at' => $starts,
            'ends_at' => $ends,
            'sms_send_hour' => in_array(AutomationCatalog::CHANNEL_SMS, $channels, true) ? (int) $smsHour : null,
            'in_app_send_hour' => in_array(AutomationCatalog::CHANNEL_IN_APP, $channels, true) ? (int) $inAppHour : null,
            'trigger_type' => $triggerType,
            'trigger_config' => $triggerConfig,
            'conditions' => $conditions,
            'channels' => $channels,
            'title' => mb_substr($title, 0, 191),
            'body' => $body,
            'cooldown_hours' => max(0, (int) $request->input('cooldown_hours', 24)),
            'max_sends' => $request->filled('max_sends') ? max(1, (int) $request->input('max_sends')) : null,
            'logic_fingerprint' => $fingerprint,
        ];
    }

    private function duplicateOf(string $fingerprint, ?int $ignoreId, bool $activeOnly): ?Automation
    {
        $q = Automation::query()->where('logic_fingerprint', $fingerprint);
        if ($ignoreId) {
            $q->where('id', '!=', $ignoreId);
        }
        if ($activeOnly) {
            $q->where('is_active', true);
        }

        return $q->first();
    }

    private function uniqueCode(string $name, ?int $ignoreId): string
    {
        $base = Str::slug($name);
        if ($base === '') {
            $base = 'auto';
        }
        $code = $base;
        $i = 2;
        while (
            Automation::query()
                ->where('code', $code)
                ->when($ignoreId, fn ($q) => $q->where('id', '!=', $ignoreId))
                ->exists()
        ) {
            $code = $base.'-'.$i;
            $i++;
        }

        return mb_substr($code, 0, 64);
    }
}