package main

import "testing"

func TestNewContactsStore(t *testing.T) {
	t.Run("normal build", func(t *testing.T) {
		cs, err := NewContactsStore()
		if err != nil {
			t.Fatal(err)
		}
		if cs == nil {
			t.Fatal("nil store created")
		}
		if len(cs.data) == 0 {
			t.Fatal("empty store")
		}
	})
	t.Run("building with missing file", func(t *testing.T) {
		scf := ContactsFile
		t.Cleanup(func() {
			ContactsFile = scf
		})
		ContactsFile = "badfile.json"
		cs, err := NewContactsStore()
		if err == nil || cs != nil {
			t.Fatalf("unexpected success creation from missing file")
		}
	})
}

func TestContactsStore_Load(t *testing.T) {
	var cs *ContactsStore
	t.Run("nil store", func(t *testing.T) {
		if err := cs.Load(); err == nil {
			t.Fatalf("unexpected success on loading nil store")
		}
	})
	cs = &ContactsStore{
		data: make(map[int]Contact),
	}
	t.Run("valid load", func(t *testing.T) {
		if err := cs.Load(); err != nil {
			t.Fatalf("unexpected error on loading valid store: err")
		}
	})
	t.Run("missing file", func(t *testing.T) {
		scf := ContactsFile
		t.Cleanup(func() {
			ContactsFile = scf
		})
		ContactsFile = "badfile.json"
		if err := cs.Load(); err == nil {
			t.Fatalf("unexpected success on loading missing file")
		}
	})
	t.Run("non-json file", func(t *testing.T) {
		scf := ContactsFile
		t.Cleanup(func() {
			ContactsFile = scf
		})
		ContactsFile = "contacts_model_test.go"
		if err := cs.Load(); err == nil {
			t.Fatalf("unexpected success on loading non-json file")
		}
	})
}