// Copyright 2022 Tailscale Inc & Contributors
// SPDX-License-Identifier: BSD-3-Clause

package golink

import (
	"path"
	"testing"

	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"
)

// Test saving, loading, and deleting links for SQLiteDB.
func Test_SQLiteDB_SaveLoadDeleteLinks(t *testing.T) {
	db, err := NewSQLiteDB(path.Join(t.TempDir(), "links.db"))
	if err != nil {
		t.Error(err)
	}

	links := []*Link{
		{Short: "short", Long: "long"},
		{Short: "Foo.Bar", Long: "long"},
	}

	for _, link := range links {
		if err := db.Save(link); err != nil {
			t.Error(err)
		}
		got, err := db.Load(link.Short)
		if err != nil {
			t.Error(err)
		}

		if !cmp.Equal(got, link) {
			t.Errorf("db save and load got %v, want %v", *got, *link)
		}
	}

	got, err := db.LoadAll()
	if err != nil {
		t.Error(err)
	}

	sortLinks := cmpopts.SortSlices(func(a, b *Link) bool {
		return a.Short < b.Short
	})
	if !cmp.Equal(got, links, sortLinks) {
		t.Errorf("db.LoadAll got %v, want %v", got, links)
	}

	for _, link := range links {
		if err := db.Delete(link.Short); err != nil {
			t.Error(err)
		}
	}

	got, err = db.LoadAll()
	if err != nil {
		t.Error(err)
	}
	want := []*Link(nil)
	if !cmp.Equal(got, want) {
		t.Errorf("db.LoadAll got %v, want %v", got, want)
	}
}

// Test saving, loading, and deleting stats for SQLiteDB.
func Test_SQLiteDB_SaveLoadDeleteStats(t *testing.T) {
	db, err := NewSQLiteDB(path.Join(t.TempDir(), "links.db"))
	if err != nil {
		t.Error(err)
	}

	// preload some links
	links := []*Link{
		{Short: "a"},
		{Short: "B-c"},
	}
	for _, link := range links {
		if err := db.Save(link); err != nil {
			t.Error(err)
		}
	}

	// Stats to record and then retrieve.
	// Stats to store do not need to be their canonical short name,
	// but returned stats always should be.
	stats := []ClickStats{
		{"a": 1},
		{"b-c": 1},
		{"a": 1, "bc": 2},
	}
	want := ClickStats{
		"a":   2,
		"B-c": 3,
	}

	for _, s := range stats {
		if err := db.SaveStats(s); err != nil {
			t.Error(err)
		}
	}

	got, err := db.LoadStats()
	if err != nil {
		t.Error(err)
	}
	if !cmp.Equal(got, want) {
		t.Errorf("db.LoadStats got %v, want %v", got, want)
	}

	for k := range want {
		if err := db.DeleteStats(k); err != nil {
			t.Error(err)
		}
	}

	got, err = db.LoadStats()
	if err != nil {
		t.Error(err)
	}
	want = ClickStats{}
	if !cmp.Equal(got, want) {
		t.Errorf("db.LoadStats got %v, want %v", got, want)
	}
}