<?php

namespace App\Http\Controllers;

use App\Actions\ProjectPermissions\ProjectPermissionService;
use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
use App\Http\Requests\StoreProjectNamedSettingRequest;
use App\Http\Requests\StoreTicketFieldDefinitionRequest;
use App\Http\Requests\UpdateProjectNamedSettingRequest;
use App\Http\Requests\UpdateTicketFieldDefinitionRequest;
use App\Models\Project;
use App\Models\TicketFieldDefinition;
use App\Models\TicketPriority;
use App\Models\TicketType;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Inertia\Inertia;
use Inertia\Response;

class ProjectTicketMetadataSettingsController extends Controller
{
    public function __construct(
        private readonly InitializeProjectTicketMetadata $initializeProjectTicketMetadata,
        private readonly ProjectPermissionService $projectPermissionService,
    ) {}

    public function show(Request $request, Project $project): Response
    {
        $this->abortUnlessCanManage($request, $project);
        $this->initializeProjectTicketMetadata->handle($project);

        return Inertia::render('projects/settings/Metadata', [
            'fieldTypeOptions' => collect(TicketFieldDefinition::FIELD_TYPES)
                ->map(fn (string $fieldType): array => [
                    'label' => ucfirst($fieldType),
                    'value' => $fieldType,
                ])
                ->all(),
            'project' => $project,
            'status' => session('status'),
            'ticketFieldDefinitions' => $project->ticketFieldDefinitions()->get(),
            'ticketPriorities' => $project->ticketPriorities()->get(),
            'ticketTypes' => $project->ticketTypes()->get(),
        ]);
    }

    public function storeType(StoreProjectNamedSettingRequest $request, Project $project): RedirectResponse
    {
        $this->abortUnlessCanManage($request, $project);
        $this->initializeProjectTicketMetadata->handle($project);

        $ticketType = DB::transaction(function () use ($project, $request): TicketType {
            $ticketType = $project->ticketTypes()->create([
                'is_builtin' => false,
                'name' => $request->validated('name'),
                'position' => $project->ticketTypes()->count() + 1,
                'system_key' => null,
            ]);

            $this->reorderModels(
                $project->ticketTypes()->whereKeyNot($ticketType->id)->get()->values(),
                $ticketType,
                $request->position() ?? $project->ticketTypes()->count(),
            );

            return $ticketType;
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketType->name} type was added.");
    }

    public function updateType(
        UpdateProjectNamedSettingRequest $request,
        Project $project,
        TicketType $ticketType,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);
        $this->initializeProjectTicketMetadata->handle($project);

        DB::transaction(function () use ($project, $request, $ticketType): void {
            $ticketType->update([
                'name' => $request->validated('name'),
            ]);

            $this->reorderModels(
                $project->ticketTypes()->whereKeyNot($ticketType->id)->get()->values(),
                $ticketType,
                $request->position(),
            );
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketType->fresh()->name} type was updated.");
    }

    public function destroyType(Request $request, Project $project, TicketType $ticketType): RedirectResponse
    {
        $this->abortUnlessCanManage($request, $project);

        abort_if($ticketType->is_builtin, 403);

        $deletedName = $ticketType->name;

        DB::transaction(function () use ($project, $ticketType): void {
            $ticketType->delete();

            $this->persistOrderedModels($project->ticketTypes()->get()->values());
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$deletedName} type was removed.");
    }

    public function storePriority(StoreProjectNamedSettingRequest $request, Project $project): RedirectResponse
    {
        $this->abortUnlessCanManage($request, $project);

        $ticketPriority = DB::transaction(function () use ($project, $request): TicketPriority {
            $ticketPriority = $project->ticketPriorities()->create([
                'name' => $request->validated('name'),
                'position' => $project->ticketPriorities()->count() + 1,
            ]);

            $this->reorderModels(
                $project->ticketPriorities()->whereKeyNot($ticketPriority->id)->get()->values(),
                $ticketPriority,
                $request->position() ?? $project->ticketPriorities()->count(),
            );

            return $ticketPriority;
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketPriority->name} priority was added.");
    }

    public function updatePriority(
        UpdateProjectNamedSettingRequest $request,
        Project $project,
        TicketPriority $ticketPriority,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);

        DB::transaction(function () use ($project, $request, $ticketPriority): void {
            $ticketPriority->update([
                'name' => $request->validated('name'),
            ]);

            $this->reorderModels(
                $project->ticketPriorities()->whereKeyNot($ticketPriority->id)->get()->values(),
                $ticketPriority,
                $request->position(),
            );
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketPriority->fresh()->name} priority was updated.");
    }

    public function destroyPriority(
        Request $request,
        Project $project,
        TicketPriority $ticketPriority,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);

        $deletedName = $ticketPriority->name;

        DB::transaction(function () use ($project, $ticketPriority): void {
            $ticketPriority->delete();

            $this->persistOrderedModels($project->ticketPriorities()->get()->values());
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$deletedName} priority was removed.");
    }

    public function storeFieldDefinition(
        StoreTicketFieldDefinitionRequest $request,
        Project $project,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);

        $ticketFieldDefinition = DB::transaction(function () use ($project, $request): TicketFieldDefinition {
            $ticketFieldDefinition = $project->ticketFieldDefinitions()->create([
                'field_type' => $request->validated('field_type'),
                'label' => $request->validated('label'),
                'position' => $project->ticketFieldDefinitions()->count() + 1,
            ]);

            $this->reorderModels(
                $project->ticketFieldDefinitions()->whereKeyNot($ticketFieldDefinition->id)->get()->values(),
                $ticketFieldDefinition,
                $request->position() ?? $project->ticketFieldDefinitions()->count(),
            );

            return $ticketFieldDefinition;
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketFieldDefinition->label} field was added.");
    }

    public function updateFieldDefinition(
        UpdateTicketFieldDefinitionRequest $request,
        Project $project,
        TicketFieldDefinition $ticketFieldDefinition,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);

        DB::transaction(function () use ($project, $request, $ticketFieldDefinition): void {
            $ticketFieldDefinition->update([
                'field_type' => $request->validated('field_type'),
                'label' => $request->validated('label'),
            ]);

            $this->reorderModels(
                $project->ticketFieldDefinitions()->whereKeyNot($ticketFieldDefinition->id)->get()->values(),
                $ticketFieldDefinition,
                $request->position(),
            );
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$ticketFieldDefinition->fresh()->label} field was updated.");
    }

    public function destroyFieldDefinition(
        Request $request,
        Project $project,
        TicketFieldDefinition $ticketFieldDefinition,
    ): RedirectResponse {
        $this->abortUnlessCanManage($request, $project);

        $deletedLabel = $ticketFieldDefinition->label;

        DB::transaction(function () use ($project, $ticketFieldDefinition): void {
            $ticketFieldDefinition->delete();

            $this->persistOrderedModels($project->ticketFieldDefinitions()->get()->values());
        });

        return to_route('projects.settings.metadata', $project)
            ->with('status', "{$deletedLabel} field was removed.");
    }

    private function abortUnlessCanManage(Request $request, Project $project): void
    {
        abort_unless(
            $this->projectPermissionService->userCanManageProjectAccess($request->user(), $project),
            403,
        );
    }

    /**
     * @param  Collection<int, Model>  $models
     */
    private function persistOrderedModels(Collection $models): void
    {
        $temporaryOffset = ((int) $models->max('position')) + $models->count() + 1;

        $models->each(function (Model $model, int $index) use ($temporaryOffset): void {
            $model->forceFill([
                'position' => $temporaryOffset + $index,
            ])->saveQuietly();
        });

        $models->each(function (Model $model, int $index): void {
            $model->forceFill([
                'position' => $index + 1,
            ])->saveQuietly();
        });
    }

    /**
     * @param  Collection<int, Model>  $existingModels
     */
    private function reorderModels(Collection $existingModels, Model $movingModel, int $desiredPosition): void
    {
        $insertAt = max(0, min($desiredPosition - 1, $existingModels->count()));

        $existingModels->splice($insertAt, 0, [$movingModel]);

        $this->persistOrderedModels($existingModels->values());
    }
}