<?php

namespace App\Http\Controllers;

use App\Enums\EnvironmentVariableSource;
use App\Http\Requests\ImportEnvironmentVariablesRequest;
use App\Http\Requests\StoreEnvironmentVariableRequest;
use App\Http\Requests\UpdateEnvironmentVariableRequest;
use App\Models\Organisation;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Inertia\Response;

class EnvironmentVariableController extends Controller
{
    public function index(Request $request): Response
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));

        return inertia('environment-variables/Index', [
            'application' => $application,
            'environment' => $environment,
            'variables' => $environment->variables()
                ->with('serviceSlice')
                ->orderBy('key')
                ->get(),
        ]);
    }

    public function create(Request $request): Response
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));

        return inertia('environment-variables/Create', [
            'application' => $application,
            'environment' => $environment,
        ]);
    }

    public function store(StoreEnvironmentVariableRequest $request): RedirectResponse
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));

        $environment->variables()->updateOrCreate([
            'key' => $request->string('key')->toString(),
        ], [
            'value' => $request->string('value')->toString(),
            'source' => EnvironmentVariableSource::USER,
            'service_slice_id' => null,
            'overridable' => $request->boolean('overridable', true),
        ]);

        return redirect()
            ->route('environments.show', [
                'organisation' => $organisation->id,
                'application' => $application->id,
                'environment' => $environment->id,
            ])
            ->with('success', 'Environment variable saved.');
    }

    public function import(ImportEnvironmentVariablesRequest $request): RedirectResponse
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));
        $count = 0;

        foreach ($this->parseDotEnv($request->string('contents')->toString()) as $key => $value) {
            $environment->variables()->updateOrCreate([
                'key' => $key,
            ], [
                'value' => $value,
                'source' => EnvironmentVariableSource::USER,
                'service_slice_id' => null,
                'overridable' => $request->boolean('overridable', true),
            ]);

            $count++;
        }

        return redirect()
            ->route('environment-variables.index', [
                'organisation' => $organisation->id,
                'application' => $application->id,
                'environment' => $environment->id,
            ])
            ->with('success', "{$count} environment variables imported.");
    }

    public function edit(Request $request): Response
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));
        $variable = $environment->variables()->with('serviceSlice')->findOrFail($request->route('variable'));

        return inertia('environment-variables/Edit', [
            'application' => $application,
            'environment' => $environment,
            'variable' => $variable,
        ]);
    }

    public function update(UpdateEnvironmentVariableRequest $request): RedirectResponse
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));
        $variable = $environment->variables()->findOrFail($request->route('variable'));

        $variable->update([
            'key' => $request->string('key')->toString(),
            'value' => $request->string('value')->toString(),
            'overridable' => $request->boolean('overridable'),
        ]);

        return redirect()
            ->route('environment-variables.index', [
                'organisation' => $organisation->id,
                'application' => $application->id,
                'environment' => $environment->id,
            ])
            ->with('success', 'Environment variable updated.');
    }

    public function destroy(Request $request): RedirectResponse
    {
        $organisation = Organisation::findOrFail($request->route('organisation'));
        $application = $organisation->applications()->findOrFail($request->route('application'));
        $environment = $application->environments()->findOrFail($request->route('environment'));
        $variable = $environment->variables()->findOrFail($request->route('variable'));

        $variable->delete();

        return redirect()
            ->route('environment-variables.index', [
                'organisation' => $organisation->id,
                'application' => $application->id,
                'environment' => $environment->id,
            ])
            ->with('success', 'Environment variable deleted.');
    }

    /**
     * @return array<string, string>
     */
    private function parseDotEnv(string $contents): array
    {
        return collect(preg_split('/\R/', $contents) ?: [])
            ->map(fn (string $line): string => trim($line))
            ->reject(fn (string $line): bool => $line === '' || str_starts_with($line, '#'))
            ->mapWithKeys(function (string $line): array {
                if (str_starts_with($line, 'export ')) {
                    $line = trim(substr($line, 7));
                }

                [$key, $value] = array_pad(explode('=', $line, 2), 2, '');
                $key = trim($key);

                if (! preg_match('/^[A-Z][A-Z0-9_]*$/', $key)) {
                    return [];
                }

                return [$key => $this->unquoteDotEnvValue(trim($value))];
            })
            ->all();
    }

    private function unquoteDotEnvValue(string $value): string
    {
        if (str_starts_with($value, '"') && str_ends_with($value, '"')) {
            return stripcslashes(substr($value, 1, -1));
        }

        if (str_starts_with($value, "'") && str_ends_with($value, "'")) {
            return substr($value, 1, -1);
        }

        return $value;
    }
}