// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.

// scanner_test.go
package text

import (
	"errors"
	"testing"
)

func TestGetVarSpec(t *testing.T) {
	type inputGetVarSpec struct {
		source     string
		offset     int
		wantSpec   string
		wantFlags  ScannerFlag
		wantOffset int
		wantErr    error
	}

	funcName := "getVarSpec"

	inputs := []inputGetVarSpec{
		{"Hello ${name}.", 7, "name", ScannerFlag(0), 13, nil},
		{"one ${!varspec}", 5, "varspec", ValueRequired, 15, nil},
		{"one ${*varspec}", 5, "varspec", EncryptValue, 15, nil},
		{"one ${*!varspec}", 5, "varspec", ValueRequired | EncryptValue, 16, nil},
		{"one ${*!var{spec}", 5, "", ValueRequired | EncryptValue, 17, errors.New("unbalanced open braces at offset 11")},
		{"one ${two}${three}", 11, "three", ScannerFlag(0), 18, nil},
		{"one $2${three}", 5, "2", ScannerFlag(0), 6, nil},
		{"one $!2${three}", 5, "", ScannerFlag(0), 5, nil},
		{"one $2{3}${three}", 5, "2", ScannerFlag(0), 6, nil},
		{"one ${{2}}{3}${three}", 5, "{2}", ScannerFlag(0), 10, nil},
		{">${|ciao}<", 2, "|ciao", ScannerFlag(0), 9, nil},
		{">${|{ciao}<", 2, "", ScannerFlag(0), 11, errors.New("unbalanced open braces at offset 4")},
	}

	for i, input := range inputs {
		gotSpec, gotFlags, gotOffset, gotErr := getVarSpec(input.source, input.offset)

		if gotSpec != input.wantSpec {
			t.Errorf("%d: %s(%q, %d)/spec = %q, want %q", i, funcName, input.source, input.offset, gotSpec, input.wantSpec)
		}

		if gotFlags != input.wantFlags {
			t.Errorf("%d: %s(%q, %d)/flags = %d, want %d", i, funcName, input.source, input.offset, gotFlags, input.wantFlags)
		}

		if gotOffset != input.wantOffset {
			t.Errorf("%d: %s(%q, %d)/offset = %d, want %d", i, funcName, input.source, input.offset, gotOffset, input.wantOffset)
		}

		if gotErr == nil && input.wantErr == nil {
			continue
		}
		if (gotErr != nil && input.wantErr == nil) || (gotErr == nil && input.wantErr != nil) || (gotErr.Error() != input.wantErr.Error()) {
			t.Errorf("%d: %s(%q, %d)/err = %v, want %v", i, funcName, input.source, input.offset, gotErr, input.wantErr)
		}
	}
}

type ctxType struct{}

func (ctx *ctxType) Handle(spec string, flags ScannerFlag) (value string, err error) {
	//fmt.Println("Spec:", spec)
	switch spec {
	case "value":
		value = "right-value"
	case "|ciao":
		value = "ciao"
	case `|__sum(1,2,3)`:
		value = "6"
	case `|__cat(1,"2",3)`:
		value = "123"
	case `uno|due`:
		value = "uno"
	case "|__xyz()":
		err = errors.New("unknown function __xyz")
	default:
		value = ""
	}
	return
}

func TestScan(t *testing.T) {
	type inputType struct {
		ctx        VariableHandler
		source     string
		wantResult string
		wantErr    error
	}

	funcName := "scan"

	inputs := []inputType{
		{&ctxType{}, "this is the ${value}!", "this is the right-value!", nil},
		{&ctxType{}, `pay \$31`, `pay $31`, nil},
		{&ctxType{}, `\\regex\\`, `\regex\`, nil},
		{&ctxType{}, `fake \x.`, `fake x.`, nil},
		{&ctxType{}, ">${|ciao}<", ">ciao<", nil},
		{&ctxType{}, `>${|__sum(1,2,3)}<`, ">6<", nil},
		{&ctxType{}, `>${|__cat(1,"2",3)}<`, ">123<", nil},
		{&ctxType{}, `>${|__cat(1,"2",3)<`, "", errors.New("unbalanced open braces at offset 2")},
		{&ctxType{}, `>${|__xyz()}<`, "", errors.New("unknown function __xyz")},
		{&ctxType{}, `>${uno|due}<`, ">uno<", nil},
	}

	for i, input := range inputs {
		gotResult, gotErr := Scan(input.ctx, input.source)

		if gotResult != input.wantResult {
			t.Errorf("%d: %s(%q)/result = %q, want %q", i, funcName, input.source, gotResult, input.wantResult)
		}

		if gotErr == nil && input.wantErr == nil {
			continue
		}
		if (gotErr != nil && input.wantErr == nil) || (gotErr == nil && input.wantErr != nil) || (gotErr.Error() != input.wantErr.Error()) {
			t.Errorf("%d: %s(%q)/err = %v, want %v", i, funcName, input.source, gotErr, input.wantErr)
		}
	}
}