package updates

import (
	"encoding/json"
	"reflect"
	"strings"
	"testing"

	"git.golem15.com/golem15/sm-user-plugin/classes"
	"git.golem15.com/golem15/sm-user-plugin/models"
	"git.golem15.com/golem15/summercms/modules/lagoon"
	"github.com/go-gormigrate/gormigrate/v2"
)

func TestUserGroupsMigration(t *testing.T) {
	sqlDB := dedicatedDB(t, "user_groups")
	gdb, err := lagoon.Use(t.Context(), sqlDB)
	if err != nil {
		t.Fatal(err)
	}
	m := gormigrate.New(gdb, &gormigrate.Options{
		TableName:      "summer_migrations_golem15_user",
		UseTransaction: true,
	}, All())
	if err := m.Migrate(); err != nil {
		t.Fatal(err)
	}
	for _, table := range []string{"user_groups", "users_groups"} {
		if !gdb.Migrator().HasTable(table) {
			t.Fatalf("%s missing after migrate", table)
		}
	}
	for _, col := range []string{"id", "name", "code", "description", "permissions", "created_at", "updated_at"} {
		if !gdb.Migrator().HasColumn("user_groups", col) {
			t.Fatalf("user_groups.%s missing", col)
		}
	}
	var seeded []models.UserGroup
	if err := gdb.Order("id").Find(&seeded).Error; err != nil {
		t.Fatal(err)
	}
	if len(seeded) != 2 || seeded[0].Name != "Guest" || *seeded[0].Code != models.GroupGuest ||
		*seeded[0].Description != "Default group for guest users." ||
		seeded[1].Name != "Registered" || *seeded[1].Code != models.GroupRegistered ||
		*seeded[1].Description != "Default group for registered users." ||
		seeded[0].CreatedAt == nil || seeded[0].Permissions != nil {
		t.Fatalf("seed rows = %+v", seeded)
	}
	var pk string
	if err := gdb.Raw(`SELECT conname FROM pg_constraint WHERE conrelid = 'users_groups'::regclass AND contype = 'p'`).Scan(&pk).Error; err != nil {
		t.Fatal(err)
	}
	if pk != "user_group" {
		t.Fatalf("users_groups primary key = %q", pk)
	}

	// Frontend permissions, last seen, API tokens, user permissions, then user groups.
	for range 5 {
		if err := m.RollbackLast(); err != nil {
			t.Fatal(err)
		}
	}
	if gdb.Migrator().HasTable("user_groups") || gdb.Migrator().HasTable("users_groups") {
		t.Fatal("user groups tables survived rollback")
	}
	if !gdb.Migrator().HasTable("jwt_blacklist") || !gdb.Migrator().HasTable("users") {
		t.Fatal("rollback dropped an earlier table")
	}
	if err := m.Migrate(); err != nil {
		t.Fatalf("re-up: %v", err)
	}
	var n int64
	if err := gdb.Table("user_groups").Count(&n).Error; err != nil || n != 2 {
		t.Fatalf("re-up rows = %d err = %v", n, err)
	}
}

func TestUserGroupsCodesAndRelation(t *testing.T) {
	sqlDB := dedicatedDB(t, "user_groups_codes")
	gdb, err := lagoon.Use(t.Context(), sqlDB)
	if err != nil {
		t.Fatal(err)
	}
	m := gormigrate.New(gdb, &gormigrate.Options{
		TableName:      "summer_migrations_golem15_user",
		UseTransaction: true,
	}, All())
	if err := m.Migrate(); err != nil {
		t.Fatal(err)
	}
	admin := "admin"
	adminGroup := models.UserGroup{Name: "Admins", Code: &admin}
	if err := gdb.Create(&adminGroup).Error; err != nil {
		t.Fatal(err)
	}
	noCode := models.UserGroup{Name: "Uncoded"}
	if err := gdb.Create(&noCode).Error; err != nil {
		t.Fatal(err)
	}
	site := models.User{Email: "site-admin@example.test"}
	plain := models.User{Email: "plain@example.test"}
	for _, u := range []*models.User{&site, &plain} {
		if err := gdb.Omit("Groups").Create(u).Error; err != nil {
			t.Fatal(err)
		}
	}
	for _, gid := range []uint{noCode.ID, adminGroup.ID, 2} {
		if err := gdb.Exec(`INSERT INTO users_groups (user_id, user_group_id) VALUES (?, ?)`, site.ID, gid).Error; err != nil {
			t.Fatal(err)
		}
	}

	codes, err := classes.UserGroupCodes(t.Context(), gdb, site.ID)
	if err != nil {
		t.Fatal(err)
	}
	if want := []string{"registered", "admin"}; !reflect.DeepEqual(codes, want) {
		t.Fatalf("codes = %v, want %v", codes, want)
	}
	codes, err = classes.UserGroupCodes(t.Context(), gdb, plain.ID)
	if err != nil || codes == nil || len(codes) != 0 {
		t.Fatalf("plain codes = %#v err = %v", codes, err)
	}
	for _, c := range []struct {
		user uint
		code string
		want bool
	}{{site.ID, "admin", true}, {plain.ID, "admin", false}, {site.ID, "guest", false}} {
		got, err := classes.HasGroupCode(t.Context(), gdb, c.user, c.code)
		if err != nil || got != c.want {
			t.Fatalf("HasGroupCode(%d, %s) = %v, %v", c.user, c.code, got, err)
		}
	}

	// The relation loads through the pivot and is never serialized.
	var loaded models.User
	if err := gdb.Preload("Groups").Take(&loaded, site.ID).Error; err != nil {
		t.Fatal(err)
	}
	if len(loaded.Groups) != 3 {
		t.Fatalf("groups = %+v", loaded.Groups)
	}
	raw, err := json.Marshal(loaded)
	if err != nil || strings.Contains(string(raw), "Groups") || strings.Contains(string(raw), "Admins") {
		t.Fatalf("user JSON = %s err = %v", raw, err)
	}
	if _, err := classes.UserGroupCodes(t.Context(), nil, site.ID); err == nil {
		t.Fatal("nil handle must be an error")
	}
}