<?php

namespace App\Livewire;

use App\Models\Issue;
use App\Models\IssueChecklistTemplate;
use App\Models\IssueComment;
use App\Models\IssueTask;
use App\Models\Project;
use App\Notifications\IssueCommentedNotification;
use App\Notifications\IssueStatusChangedNotification;
use App\Notifications\IssueTaskAssignedNotification;
use Illuminate\Support\Facades\Auth;
use Illuminate\Validation\ValidationException;
use Livewire\Attributes\Layout;
use Livewire\Component;
use Livewire\WithFileUploads;

#[Layout('layouts.app')]
class IssueDetail extends Component
{
    use WithFileUploads;

    public Project $project;
    public Issue $issue;

    // New task form
    public string $newTaskTitle = '';
    public $newTaskAssignee = '';
    public $newTaskDue = '';

    // Checklist templates
    public $checklistTemplates = [];
    public $applyTemplateId = '';

    // New comment form
    public string $newComment = '';
    public $commentPhoto = null;       // single optional photo on a comment

    // Issue-level photos
    public $issuePhotos = [];          // multiple

    // Verification / resolution
    public string $resolutionNotes = '';

    public $projectUsers = [];

    public function mount(Project $project, Issue $issue)
    {
        abort_unless($issue->project_id === $project->id, 404);
        $this->project = $project;
        $this->issue = $issue;
        abort_unless($this->canAccessProject() && Auth::user()->can('view issues'), 403);

        $this->resolutionNotes = $issue->resolution_notes ?? '';
        $this->projectUsers = $project->users()->orderBy('name')->get();
        $this->checklistTemplates = IssueChecklistTemplate::where('project_id', $project->id)->orderBy('name')->get();
        $this->refreshIssue();
    }

    private function canAccessProject(): bool
    {
        $user = Auth::user();
        return $user->can('manage all')
            || $this->project->users()->where('user_id', $user->id)->exists();
    }

    private function canEdit(): bool
    {
        return Auth::user()->can('edit issues');
    }

    /** Notify the issue's stakeholders (reporter + assignee), excluding the current actor. */
    private function notifyStakeholders($notification): void
    {
        $this->issue->loadMissing(['reporter', 'assignee']);
        collect([$this->issue->reporter, $this->issue->assignee])
            ->filter()
            ->unique('id')
            ->reject(fn ($u) => $u->id === Auth::id())
            ->each(fn ($u) => $u->notify($notification));
    }

    public function refreshIssue(): void
    {
        $this->issue->load([
            'reporter', 'assignee', 'feature',
            'tasks.assignee', 'tasks.completer',
            'comments.user', 'comments.media',
            'media.uploader',
        ]);
    }

    // ── Checklist ────────────────────────────────────────────────────────────────

    public function addTask(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->validate([
            'newTaskTitle'    => 'required|string|max:255',
            'newTaskAssignee' => 'nullable|exists:users,id',
            'newTaskDue'      => 'nullable|date',
        ]);

        $task = $this->issue->tasks()->create([
            'title'       => $this->newTaskTitle,
            'assigned_to' => $this->newTaskAssignee ?: null,
            'due_date'    => $this->newTaskDue ?: null,
            'order'       => ((int) $this->issue->tasks()->max('order')) + 1,
            'uuid'        => (string) \Illuminate\Support\Str::uuid(),
        ]);

        // Notify the assignee (unless they assigned it to themselves).
        if ($task->assigned_to && $task->assigned_to !== Auth::id()) {
            $task->loadMissing('issue');
            $task->assignee?->notify(new IssueTaskAssignedNotification($task));
        }

        $this->reset(['newTaskTitle', 'newTaskAssignee', 'newTaskDue']);
        $this->refreshIssue();
        $this->dispatch('notify', 'Tarea añadida');
    }

    public function applyTemplate(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->validate(['applyTemplateId' => 'required|exists:issue_checklist_templates,id']);

        $template = IssueChecklistTemplate::where('project_id', $this->project->id)
            ->findOrFail($this->applyTemplateId);

        $order = (int) $this->issue->tasks()->max('order');
        foreach ($template->items ?: [] as $title) {
            $this->issue->tasks()->create([
                'title' => $title,
                'order' => ++$order,
                'uuid'  => (string) \Illuminate\Support\Str::uuid(),
            ]);
        }

        $this->applyTemplateId = '';
        $this->refreshIssue();
        $this->dispatch('notify', 'Plantilla aplicada');
    }

    public function toggleTask($taskId): void
    {
        abort_unless($this->canEdit(), 403);
        $task = $this->issue->tasks()->findOrFail($taskId);
        $done = ! $task->is_done;
        $task->update([
            'is_done' => $done,
            'done_at' => $done ? now() : null,
            'done_by' => $done ? Auth::id() : null,
        ]);
        $this->refreshIssue();
    }

    public function deleteTask($taskId): void
    {
        abort_unless($this->canEdit(), 403);
        $this->issue->tasks()->findOrFail($taskId)->delete();
        $this->refreshIssue();
        $this->dispatch('notify', 'Tarea eliminada');
    }

    // ── Comments + photos ──────────────────────────────────────────────────────────

    public function addComment(): void
    {
        // Anyone who can view the issue (and is a member) may comment / report progress.
        $this->validate([
            'newComment'   => 'nullable|string|max:5000',
            'commentPhoto' => 'nullable|image|max:20480', // 20 MB
        ]);

        if (trim($this->newComment) === '' && ! $this->commentPhoto) {
            throw ValidationException::withMessages([
                'newComment' => 'Escribe un comentario o adjunta una foto.',
            ]);
        }

        $comment = $this->issue->comments()->create([
            'user_id' => Auth::id(),
            'body'    => trim($this->newComment) ?: '(foto)',
            'uuid'    => (string) \Illuminate\Support\Str::uuid(),
        ]);

        if ($this->commentPhoto) {
            abort_unless(Auth::user()->can('upload media'), 403);
            $this->storeUpload($this->commentPhoto, $comment, 'comment');
        }

        $comment->setRelation('issue', $this->issue)->setRelation('user', Auth::user());
        $this->notifyStakeholders(new IssueCommentedNotification($comment));

        $this->reset(['newComment', 'commentPhoto']);
        $this->refreshIssue();
        $this->dispatch('notify', 'Comentario añadido');
    }

    public function uploadIssuePhotos(): void
    {
        abort_unless(Auth::user()->can('upload media'), 403);
        $this->validate(['issuePhotos.*' => 'required|image|max:20480']);

        foreach ($this->issuePhotos as $photo) {
            $this->storeUpload($photo, $this->issue, 'issue');
        }

        $this->reset('issuePhotos');
        $this->refreshIssue();
        $this->dispatch('notify', 'Fotos subidas');
    }

    public function deleteMedia($mediaId): void
    {
        $media = \App\Models\Media::findOrFail($mediaId);
        $user = Auth::user();
        abort_unless($user->can('delete media') || $media->uploaded_by === $user->id, 403);
        $media->delete();
        $this->refreshIssue();
        $this->dispatch('notify', 'Foto eliminada');
    }

    /** Store an uploaded file on the public disk and attach it to a parent model. */
    private function storeUpload($file, $parent, string $entity): void
    {
        $mime = $file->getMimeType();
        $path = $file->store("uploads/issues/{$this->issue->id}/{$entity}", 'public');

        $parent->media()->create([
            'name'           => $file->getClientOriginalName(),
            'file_path'      => $path,
            'file_type'      => $mime,
            'file_extension' => $file->getClientOriginalExtension(),
            'file_size'      => $file->getSize(),
            'category'       => str_starts_with($mime, 'image/') ? 'image' : 'document',
            'uploaded_by'    => Auth::id(),
            'uuid'           => (string) \Illuminate\Support\Str::uuid(),
        ]);
    }

    // ── Status workflow (verification) ───────────────────────────────────────────────

    public function sendToReview(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->issue->update(['status' => 'in_review']);
        $this->notifyStakeholders(new IssueStatusChangedNotification($this->issue, 'in_review'));
        $this->refreshIssue();
        $this->dispatch('notify', 'Incidencia enviada a revisión');
    }

    public function verifyResolve(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->issue->update([
            'status'           => 'resolved',
            'resolved_at'      => $this->issue->resolved_at ?? now(),
            'resolution_notes' => $this->resolutionNotes ?: null,
        ]);
        $this->notifyStakeholders(new IssueStatusChangedNotification($this->issue, 'resolved'));
        $this->refreshIssue();
        $this->dispatch('notify', 'Incidencia validada y resuelta');
    }

    public function closeIssue(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->issue->update([
            'status'      => 'closed',
            'resolved_at' => $this->issue->resolved_at ?? now(),
        ]);
        $this->notifyStakeholders(new IssueStatusChangedNotification($this->issue, 'closed'));
        $this->refreshIssue();
        $this->dispatch('notify', 'Incidencia cerrada');
    }

    public function reopen(): void
    {
        abort_unless($this->canEdit(), 403);
        $this->issue->update(['status' => 'open', 'resolved_at' => null]);
        $this->notifyStakeholders(new IssueStatusChangedNotification($this->issue, 'open'));
        $this->refreshIssue();
        $this->dispatch('notify', 'Incidencia reabierta');
    }

    public function render()
    {
        return view('livewire.issues.issue-detail', [
            'canEdit' => $this->canEdit(),
        ]);
    }
}