<?php

namespace App\Livewire\Admin;

use App\Services\AppSettingsService;
use App\Services\ArticleEmbeddingMaintenanceService;
use App\Services\LlmModelCatalogService;
use Illuminate\Support\Str;
use Livewire\Component;

class SettingsPage extends Component
{
    public string $activeTab = 'process';

    public string $tone_addressing = 'je';

    public string $activeProviderInstanceId = 'ollama_default';

    public int $llm_timeout = 300;

    public array $promptValues = [];

    public array $providerInstances = [];

    public array $modelValues = [];

    public array $availableModels = [];

    public array $embeddingStats = [];

    public ?string $modelLoadError = null;

    public array $processSteps = [];

    public array $providerDefinitions = [];

    public array $modelTasks = [];

    public function mount(AppSettingsService $settings): void
    {
        $all = $settings->all();
        $providerSettings = $settings->providerSettings();
        $this->tone_addressing = (string) ($all['tone_addressing'] ?? 'je');
        $this->activeProviderInstanceId = (string) ($providerSettings['active_instance_id'] ?? 'ollama_default');
        $this->llm_timeout = (int) ($all['llm.timeout'] ?? 300);
        $this->promptValues = $settings->promptValues();
        $this->providerInstances = $providerSettings['instances'] ?? $settings->defaultProviderInstances();
        $this->modelValues = $settings->modelSettings();
        $this->processSteps = $settings->processSteps();
        $this->providerDefinitions = $settings->providerDefinitions();
        $this->modelTasks = $settings->modelTasks();
        $this->refreshEmbeddingStats();
        $this->loadModels();
    }

    public function setTab(string $tab): void
    {
        if (in_array($tab, ['process', 'providers', 'models', 'embeddings'], true)) {
            $this->activeTab = $tab;

            if ($tab === 'embeddings') {
                $this->refreshEmbeddingStats();
            }
        }
    }

    public function refreshEmbeddingStats(): void
    {
        $this->embeddingStats = app(ArticleEmbeddingMaintenanceService::class)->stats();
    }

    public function reindexMissingEmbeddings(): void
    {
        $count = app(ArticleEmbeddingMaintenanceService::class)->dispatchReindex(false);
        $this->refreshEmbeddingStats();
        session()->flash('saved', "{$count} artikelen zonder chunks zijn in de queue geplaatst.");
    }

    public function reindexAllEmbeddings(): void
    {
        $count = app(ArticleEmbeddingMaintenanceService::class)->dispatchReindex(true);
        $this->refreshEmbeddingStats();
        session()->flash('saved', "{$count} artikelen zijn in de queue geplaatst voor volledige herindex.");
    }

    public function addProviderInstance(): void
    {
        $id = 'provider_'.Str::uuid()->toString();
        $this->providerInstances[] = [
            'id' => $id,
            'name' => 'Nieuwe provider',
            'type' => 'lmstudio',
            'base_url' => 'http://localhost:1234',
            'chat_model' => '',
            'embedding_model' => '',
        ];
        $this->activeProviderInstanceId = $id;
        $this->availableModels = [];
        $this->modelLoadError = null;
    }

    public function removeProviderInstance(string $id): void
    {
        if (count($this->providerInstances) <= 1) {
            return;
        }

        $this->providerInstances = array_values(array_filter(
            $this->providerInstances,
            fn (array $instance) => ($instance['id'] ?? null) !== $id
        ));

        if ($this->activeProviderInstanceId === $id) {
            $this->activeProviderInstanceId = (string) ($this->providerInstances[0]['id'] ?? '');
        }

        $this->loadModels();
    }

    public function setActiveProviderInstance(string $id): void
    {
        $ids = array_column($this->providerInstances, 'id');
        if (in_array($id, $ids, true)) {
            $this->activeProviderInstanceId = $id;
            $this->loadModels();
        }
    }

    public function loadModels(bool $refresh = false): void
    {
        $instance = $this->activeProviderInstance();
        if ($instance === null) {
            $this->availableModels = [];

            return;
        }

        try {
            $this->availableModels = app(LlmModelCatalogService::class)->modelsFor($instance, $refresh);
            $this->modelLoadError = null;
        } catch (\Throwable $e) {
            $this->availableModels = [];
            $this->modelLoadError = $e->getMessage();
        }
    }

    public function refreshModels(): void
    {
        $this->loadModels(true);
    }

    public function save(AppSettingsService $settings): void
    {
        $this->validate([
            'tone_addressing' => ['required', 'in:je,u'],
            'activeProviderInstanceId' => ['required', 'string'],
            'llm_timeout' => ['required', 'integer', 'min:5', 'max:600'],
            'promptValues' => ['array'],
            'promptValues.*' => ['required', 'string', 'min:10'],
            'providerInstances' => ['array', 'min:1'],
            'providerInstances.*.id' => ['required', 'string'],
            'providerInstances.*.name' => ['required', 'string', 'min:1'],
            'providerInstances.*.type' => ['required', 'in:ollama,lmstudio'],
            'providerInstances.*.base_url' => ['required', 'url'],
            'providerInstances.*.chat_model' => ['nullable', 'string'],
            'providerInstances.*.embedding_model' => ['nullable', 'string'],
            'modelValues' => ['array'],
            'modelValues.*' => ['required', 'string', 'min:1'],
        ]);

        $settings->saveStructuredSettings(
            promptValues: $this->promptValues,
            providerInstances: $this->providerInstances,
            activeProviderInstanceId: $this->activeProviderInstanceId,
            modelValues: $this->modelValues,
            timeout: $this->llm_timeout,
            tone: $this->tone_addressing,
        );

        session()->flash('saved', 'Settings opgeslagen.');
        $this->refreshEmbeddingStats();
    }

    private function activeProviderInstance(): ?array
    {
        foreach ($this->providerInstances as $instance) {
            if (($instance['id'] ?? null) === $this->activeProviderInstanceId) {
                return $instance;
            }
        }

        return $this->providerInstances[0] ?? null;
    }

    public function render()
    {
        return view('livewire.admin.settings-page');
    }
}