<?php

namespace App\Services;

use App\Models\AttendanceCommentTemplate; // <-- change if your model class name differs
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Support\Facades\DB;

class AttendanceCommentTemplateService
{
    public function list(bool $activeOnly = false): array
    {
        $query = AttendanceCommentTemplate::query()->orderBy('min_score', 'asc');

        if ($activeOnly) {
            $query->where('is_active', 1);
        }

        return $query->get()
            ->map(fn ($row) => $this->transform($row))
            ->values()
            ->all();
    }

    public function findOrFail(int $id): array
    {
        $template = AttendanceCommentTemplate::query()->find($id);

        if (!$template) {
            throw new ModelNotFoundException("Attendance comment template not found.");
        }

        return $this->transform($template);
    }

    public function create(array $data): array
    {
        return DB::transaction(function () use ($data) {
            $this->ensureNoOverlap(
                (int) $data['min_score'],
                (int) $data['max_score'],
                null,
                !empty($data['is_active'])
            );

            $template = AttendanceCommentTemplate::query()->create([
                'min_score'     => (int) $data['min_score'],
                'max_score'     => (int) $data['max_score'],
                'template_text' => (string) $data['template_text'],
                'is_active'     => (bool) ($data['is_active'] ?? true),
            ]);

            return $this->transform($template->fresh());
        });
    }

    public function update(int $id, array $data): array
    {
        return DB::transaction(function () use ($id, $data) {
            $template = AttendanceCommentTemplate::query()->find($id);

            if (!$template) {
                throw new ModelNotFoundException("Attendance comment template not found.");
            }

            $newMin = array_key_exists('min_score', $data) ? (int) $data['min_score'] : (int) $template->min_score;
            $newMax = array_key_exists('max_score', $data) ? (int) $data['max_score'] : (int) $template->max_score;
            $newIsActive = array_key_exists('is_active', $data) ? (bool) $data['is_active'] : (bool) $template->is_active;

            $this->ensureNoOverlap($newMin, $newMax, $id, $newIsActive);

            $template->fill([
                'min_score'     => $newMin,
                'max_score'     => $newMax,
                'template_text' => array_key_exists('template_text', $data)
                    ? (string) $data['template_text']
                    : (string) $template->template_text,
                'is_active'     => $newIsActive,
            ]);

            $template->save();

            return $this->transform($template->fresh());
        });
    }

    public function delete(int $id): void
    {
        $template = AttendanceCommentTemplate::query()->find($id);

        if (!$template) {
            throw new ModelNotFoundException("Attendance comment template not found.");
        }

        $template->delete();
    }

    /**
     * Prevent overlapping active score ranges.
     */
    private function ensureNoOverlap(int $min, int $max, ?int $ignoreId = null, bool $isActive = true): void
    {
        if (!$isActive) {
            return; // allow inactive templates to overlap
        }

        $query = AttendanceCommentTemplate::query()
            ->where('is_active', 1)
            ->where(function ($q) use ($min, $max) {
                $q->whereBetween('min_score', [$min, $max])
                  ->orWhereBetween('max_score', [$min, $max])
                  ->orWhere(function ($q2) use ($min, $max) {
                      $q2->where('min_score', '<=', $min)
                         ->where('max_score', '>=', $max);
                  });
            });

        if ($ignoreId !== null) {
            $query->where('id', '!=', $ignoreId);
        }

        if ($query->exists()) {
            abort(response()->json([
                'status'  => 'error',
                'message' => 'Score range overlaps with an existing active template.',
            ], 422));
        }
    }

    private function transform($row): array
    {
        return [
            'id'            => (int) ($row->id ?? 0),
            'min_score'     => (int) ($row->min_score ?? 0),
            'max_score'     => (int) ($row->max_score ?? 0),
            'template_text' => (string) ($row->template_text ?? ''),
            'is_active'     => (bool) ($row->is_active ?? false),
        ];
    }
}