<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Validator;

class JsonApiController extends Controller
{
    /**
     * Validate JSON data
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function validateJson(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'json' => 'required|json',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid request',
                'errors' => $validator->errors()
            ], 400);
        }

        try {
            $json = json_decode($request->input('json'), true, 512, JSON_THROW_ON_ERROR);
            
            return response()->json([
                'status' => 'success',
                'message' => 'Valid JSON',
                'data' => $json
            ]);
        } catch (\JsonException $e) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid JSON',
                'error' => $e->getMessage()
            ], 400);
        }
    }

    /**
     * Validate JSON against a schema
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function validateSchema(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'json' => 'required|json',
            'schema' => 'required|json',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid request',
                'errors' => $validator->errors()
            ], 400);
        }

        try {
            $json = json_decode($request->input('json'), true, 512, JSON_THROW_ON_ERROR);
            $schema = json_decode($request->input('schema'), true, 512, JSON_THROW_ON_ERROR);

            // Use Ajv for schema validation
            $ajv = new \Ajv();
            $validate = $ajv->compile($schema);
            $valid = $validate($json);

            if ($valid) {
                return response()->json([
                    'status' => 'success',
                    'message' => 'JSON is valid according to the schema',
                    'data' => $json
                ]);
            }

            return response()->json([
                'status' => 'error',
                'message' => 'JSON does not match schema',
                'errors' => $validate->errors
            ], 400);

        } catch (\JsonException $e) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid JSON or schema',
                'error' => $e->getMessage()
            ], 400);
        }
    }

    /**
     * Format JSON
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function formatJson(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'json' => 'required|json',
            'indent' => 'integer|min:0|max:8',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid request',
                'errors' => $validator->errors()
            ], 400);
        }

        try {
            $json = json_decode($request->input('json'), true, 512, JSON_THROW_ON_ERROR);
            $indent = $request->input('indent', 2);
            
            return response()->json([
                'status' => 'success',
                'message' => 'JSON formatted successfully',
                'data' => json_encode($json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE, $indent)
            ]);
        } catch (\JsonException $e) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid JSON',
                'error' => $e->getMessage()
            ], 400);
        }
    }

    /**
     * Compare two JSON documents
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function compareJson(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'json1' => 'required|json',
            'json2' => 'required|json',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid request',
                'errors' => $validator->errors()
            ], 400);
        }

        try {
            $json1 = json_decode($request->input('json1'), true, 512, JSON_THROW_ON_ERROR);
            $json2 = json_decode($request->input('json2'), true, 512, JSON_THROW_ON_ERROR);

            $diff = new \Diff($json1, $json2);
            
            return response()->json([
                'status' => 'success',
                'message' => 'JSON comparison completed',
                'data' => [
                    'are_equal' => $json1 === $json2,
                    'differences' => $diff->getDifferences()
                ]
            ]);
        } catch (\JsonException $e) {
            return response()->json([
                'status' => 'error',
                'message' => 'Invalid JSON',
                'error' => $e->getMessage()
            ], 400);
        }
    }
}