<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Livewire;

use Illuminate\Contracts\View\View;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Livewire\Attributes\Validate;
use Livewire\Component;
use Livewire\Features\SupportFileUploads\TemporaryUploadedFile;
use Livewire\WithFileUploads;
use Modules\Helpdesk\Models\Category;
use Modules\Helpdesk\Models\Priority;
use Modules\Helpdesk\Models\Product;
use Modules\Helpdesk\Models\Project;
use Modules\Helpdesk\Models\Status;
use Modules\Helpdesk\Models\Team;
use Modules\Helpdesk\Models\Tag;
use Modules\Helpdesk\Services\TicketService;

final class TicketCreate extends Component
{
    use WithFileUploads;

    #[Validate('nullable|integer')]
    public ?int $company_id = null;

    #[Validate('required|string|max:200')]
    public string $subject = '';

    #[Validate('required|string|min:10')]
    public string $body = '';

    #[Validate('nullable|integer|exists:helpdesk_statuses,id')]
    public ?int $status_id = null;

    #[Validate('required|integer|exists:helpdesk_priorities,id')]
    public ?int $priority_id = null;

    #[Validate('nullable|integer|exists:helpdesk_categories,id')]
    public ?int $category_id = null;

    #[Validate('nullable|integer|exists:helpdesk_projects,id')]
    public ?int $project_id = null;

    #[Validate('nullable|integer|exists:helpdesk_products,id')]
    public ?int $product_id = null;

    #[Validate('nullable|integer|exists:helpdesk_teams,id')]
    public ?int $team_id = null;

    #[Validate('nullable|date')]
    public ?string $due_at = null;


    /** @var array<int, int> */
    #[Validate('array')]
    public array $tag_ids = [];

    /** @var array<int, TemporaryUploadedFile> */
    #[Validate('array')]
    public array $attachments = [];

    /**
     * Initialise configured Helpdesk defaults for a new ticket.
     */
    public function mount(): void
    {
        $this->applyDefaults();
    }

    /**
     * Store a new helpdesk ticket.
     */
    public function save(TicketService $tickets): mixed
    {
        $this->validate();

        $this->validate([
            'attachments.*' => 'file|max:'.config('helpdesk.max_upload_kb').'|mimes:'.implode(',', config('helpdesk.allowed_mimes')),
            'tag_ids.*' => 'integer|exists:helpdesk_tags,id',
        ]);

        $ticket = $tickets->create(Auth::user(), [
            'company_id' => $this->company_id,
            'subject' => $this->subject,
            'body' => $this->body,
            'status_id' => $this->status_id,
            'priority_id' => $this->priority_id,
            'category_id' => $this->category_id,
            'project_id' => $this->project_id,
            'product_id' => $this->product_id,
            'team_id' => $this->team_id,
            'due_at' => $this->due_at,
            'tag_ids' => $this->tag_ids,
        ], $this->attachments);

        session()->flash('success', 'Ticket '.$ticket->reference.' has been created.');

        return $this->redirectRoute('helpdesk.tickets.index', navigate: true);
    }

    public function render(): View
    {
        $this->applyDefaults();

        return view('helpdesk::livewire.ticket-create', [
            'statuses' => $this->statusOptions(),
            'priorities' => $this->priorityOptions(),
            'categories' => $this->categoryOptions(),
            'companies' => $this->companyOptions(),
            'teams' => $this->teamOptions(),
            'projects' => $this->projectOptions(),
            'products' => Product::query()->where('is_active', true)->orderBy('name')->get(),
            'tags' => Tag::query()->orderBy('name')->get(),
        ])->layout('layouts.app');
    }

    /**
     * Apply default values from Helpdesk/company lookup configuration.
     */
    private function applyDefaults(): void
    {
        if (blank($this->company_id) && Schema::hasTable('companies') && Schema::hasColumn('companies', 'is_default_helpdesk_company')) {
            $this->company_id = $this->nullableInt(DB::table('companies')
                ->where('is_default_helpdesk_company', true)
                ->orderBy('name')
                ->value('id'));
        }

        if (blank($this->status_id) && $this->hasDefaultColumn('helpdesk_statuses')) {
            $this->status_id = $this->nullableInt(Status::query()
                ->where('is_default', true)
                ->orderBy('sort_order')
                ->value('id'));
        }

        if (blank($this->priority_id) && $this->hasDefaultColumn('helpdesk_priorities')) {
            $this->priority_id = $this->nullableInt(Priority::query()
                ->where('is_default', true)
                ->orderBy('sort_order')
                ->value('id'));
        }

        if (blank($this->category_id) && $this->hasDefaultColumn('helpdesk_categories')) {
            $this->category_id = $this->nullableInt(Category::query()
                ->where('is_default', true)
                ->when($this->company_id, fn ($query) => $query->where(function ($query): void {
                    $query->where('company_id', $this->company_id)
                        ->orWhereNull('company_id');
                }))
                ->orderByRaw('company_id is null')
                ->orderBy('name')
                ->value('id'));
        }

        if (blank($this->team_id) && $this->hasDefaultColumn('helpdesk_teams')) {
            $this->team_id = $this->nullableInt(Team::query()
                ->where('is_default', true)
                ->whereNull('archived_at')
                ->when($this->company_id, fn ($query) => $query->where(function ($query): void {
                    $query->where('company_id', $this->company_id)
                        ->orWhereNull('company_id');
                }))
                ->orderByRaw('company_id is null')
                ->orderBy('name')
                ->value('id'));
        }

        if (blank($this->project_id) && $this->hasDefaultColumn('helpdesk_projects')) {
            $this->project_id = $this->nullableInt(Project::query()
                ->where('is_default', true)
                ->whereNull('archived_at')
                ->when($this->company_id, fn ($query) => $query->where(function ($query): void {
                    $query->where('company_id', $this->company_id)
                        ->orWhereNull('company_id');
                }))
                ->when($this->team_id, fn ($query) => $query->where(function ($query): void {
                    $query->where('team_id', $this->team_id)
                        ->orWhereNull('team_id');
                }))
                ->orderByRaw('company_id is null')
                ->orderByRaw('team_id is null')
                ->orderBy('title')
                ->value('id'));
        }
    }


    /**
     * Return status options with default records listed first.
     */
    private function statusOptions(): mixed
    {
        return Status::query()
            ->when($this->hasDefaultColumn('helpdesk_statuses'), fn ($query) => $query->orderByDesc('is_default'))
            ->orderBy('sort_order')
            ->get();
    }

    /**
     * Return priority options with default records listed first.
     */
    private function priorityOptions(): mixed
    {
        return Priority::query()
            ->when($this->hasDefaultColumn('helpdesk_priorities'), fn ($query) => $query->orderByDesc('is_default'))
            ->orderBy('sort_order')
            ->get();
    }

    /**
     * Return category options with default records listed first.
     */
    private function categoryOptions(): mixed
    {
        return Category::query()
            ->when($this->hasDefaultColumn('helpdesk_categories'), fn ($query) => $query->orderByDesc('is_default'))
            ->orderBy('name')
            ->get();
    }

    /**
     * Return team options with default records listed first.
     */
    private function teamOptions(): mixed
    {
        return Team::query()
            ->whereNull('archived_at')
            ->when($this->hasDefaultColumn('helpdesk_teams'), fn ($query) => $query->orderByDesc('is_default'))
            ->orderBy('name')
            ->get();
    }

    /**
     * Return project options with default records listed first.
     */
    private function projectOptions(): mixed
    {
        return Project::query()
            ->whereNull('archived_at')
            ->when($this->hasDefaultColumn('helpdesk_projects'), fn ($query) => $query->orderByDesc('is_default'))
            ->orderBy('title')
            ->get();
    }

    /**
     * Return company options with default flag support when available.
     */
    private function companyOptions(): mixed
    {
        if (! Schema::hasTable('companies')) {
            return collect();
        }

        $columns = ['id', 'name'];

        if (Schema::hasColumn('companies', 'is_default_helpdesk_company')) {
            $columns[] = 'is_default_helpdesk_company';
        }

        return DB::table('companies')
            ->select($columns)
            ->orderByDesc(Schema::hasColumn('companies', 'is_default_helpdesk_company') ? 'is_default_helpdesk_company' : 'id')
            ->orderBy('name')
            ->get();
    }


    /**
     * Reload dependent defaults after the company changes.
     */
    public function updatedCompanyId(mixed $value): void
    {
        $this->company_id = $this->nullableInt($value);
        $this->category_id = null;
        $this->team_id = null;
        $this->project_id = null;

        $this->applyDefaults();
    }

    /**
     * Convert nullable database / Livewire values to nullable integers.
     */
    private function nullableInt(mixed $value): ?int
    {
        if ($value === null || $value === '') {
            return null;
        }

        return (int) $value;
    }

    /**
     * Check whether a Helpdesk lookup table has the default flag column.
     */
    private function hasDefaultColumn(string $table): bool
    {
        return Schema::hasTable($table) && Schema::hasColumn($table, 'is_default');
    }
}