package main

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
	"regexp"
	"strings"
)

const definition_file = "tests.json"

type TestDefinition struct {
	TestExpression    *Regexp  `json:"test_expression"`
	FailCandidates    []string `json:"fail_candidates"`
	SucceedCandidates []string `json:"succeed_candidates"`
}

type Regexp struct {
	*regexp.Regexp
}

func (r *Regexp) UnmarshalJSON(b []byte) error {
	rg, e := regexp.Compile(strings.Trim(string(b), "\""))
	if e != nil {
		return e
	}

	r.Regexp = rg

	return nil
}

func main() {

	var test_definition TestDefinition

	b, e := os.ReadFile(definition_file)
	if e != nil {
		log.Fatalf("Unable to read test definition file: %s\n", e)
	}

	e = json.Unmarshal(b, &test_definition)
	if e != nil {
		log.Fatalf("Unable to parse test definition file: %s\n", e)
	}

	all_passed := true

	for _, item := range test_definition.FailCandidates {
		if test_definition.TestExpression.MatchString(item) == true {
			all_passed = false
			fmt.Printf("FAILED on input %s: should fail to match\n", item)
		}
	}

	for _, item := range test_definition.SucceedCandidates {
		if test_definition.TestExpression.MatchString(item) == false {
			all_passed = false
			fmt.Printf("FAILED on input %s: should match\n", item)
		}
	}

	if all_passed {
		fmt.Println("All tests pass")
	}

}