package main

import (
	"testing"

	uuid "github.com/satori/go.uuid"
	"github.com/tidwall/buntdb"
)

func TestStoreUserHandling(t *testing.T) {
	store, err := NewDBStore(":memory:")
	if err != nil {
		t.Fatalf("cannot create store: %v", err)
	}
	defer store.Close()

	t.Run("store should be empty initially", func(t *testing.T) {
		users, err := store.GetUsers()
		if err != nil {
			t.Errorf("no error should have been returned: %v", err)
		}
		if len(users) != 0 {
			t.Errorf("there should be no users")
		}
	})

	t.Run("user that doesn't exist should return error", func(t *testing.T) {
		_, err := store.GetUser("someuser")
		if err != ErrUserNotFound {
			t.Errorf("unexpected error: %v", err)
		}
	})

	t.Run("adding users should work", func(t *testing.T) {
		if err := store.AddUser(User{Username: "myuser", Password: "mypass", Role: GlobalRoleUser}); err != nil {
			t.Errorf("cannot add user: %v", err)
		}

		t.Run("retrieving that single user should work", func(t *testing.T) {
			user, err := store.GetUser("myuser")
			if err != nil {
				t.Errorf("cannot retrieve user: %v", err)
			}
			if user.Username != "myuser" {
				t.Errorf("retrieved user contains unexpected username")
			}
			if user.Role != GlobalRoleUser {
				t.Errorf("retrieved user contains unexpected role")
			}
		})

		t.Run("retrieving multiple users should work", func(t *testing.T) {
			users, err := store.GetUsers()
			if err != nil {
				t.Errorf("cannot retrieve user list: %v", err)
			}
			if len(users) != 1 {
				t.Errorf("there should be only one user")
			}
			if users[0].Username != "myuser" {
				t.Errorf("retrieved user contains unexpected username")
			}
			if users[0].Role != GlobalRoleUser {
				t.Errorf("retrieved user contains unexpected role")
			}
		})

		t.Run("deleting that user should work", func(t *testing.T) {
			err := store.RemoveUser("myuser")
			if err != nil {
				t.Errorf("cannot delete user: %v", err)
			}

			t.Run("user should no longer be found", func(t *testing.T) {
				_, err := store.GetUser("myuser")
				if err != ErrUserNotFound {
					t.Errorf("unexpected error: %v", err)
				}
			})

			t.Run("user should no longer be listed", func(t *testing.T) {
				users, err := store.GetUsers()
				if err != nil {
					t.Errorf("unexpected error: %v", err)
				}
				if len(users) != 0 {
					t.Errorf("there should be no users")
				}
			})
		})
	})

	t.Run("database should be empty now", func(t *testing.T) {
		// checks that we properly deleted all keys
		if err := store.db.View(func(tx *buntdb.Tx) error {
			return tx.Ascend("", func(key, value string) bool {
				t.Errorf("there should be no keys left")
				return false
			})
		}); err != nil {
			t.Errorf("iterating keys failed: %v", err)
		}
	})
}

func TestStoreShareHandling(t *testing.T) {
	store, err := NewDBStore(":memory:")
	if err != nil {
		t.Fatalf("cannot create store: %v", err)
	}
	defer store.Close()

	t.Run("store should be empty initially", func(t *testing.T) {
		shares, err := store.GetShares()
		if err != nil {
			t.Errorf("no error should have been returned: %v", err)
		}
		if len(shares) != 0 {
			t.Errorf("there should be no shares")
		}
	})

	t.Run("creating a share should work", func(t *testing.T) {
		share, err := store.CreateShare()
		if err != nil {
			t.Errorf("error creating share: %v", err)
			return
		}
		var emptyUUID uuid.UUID
		if share.UUID == emptyUUID {
			t.Errorf("UUID is empty")
			return
		}
		if share.Name != "" || share.Description != "" {
			t.Errorf("share should not have attributes set (yet)")
		}

		t.Run("share attributes can be set", func(t *testing.T) {
			share.Name = "a name"
			share.Description = "some desc"
			if err := store.UpdateShareAttributes(share); err != nil {
				t.Errorf("cannot set attributes of share: %v", err)
			}
		})

		t.Run("cannot set attributes of unknown share", func(t *testing.T) {
			otherShare := Share{UUID: uuid.NewV4()}
			otherShare.Name = "foo"
			otherShare.Description = "bar"

			err := store.UpdateShareAttributes(otherShare)
			if err == nil {
				t.Errorf("an error should have been returned")
			} else if err != ErrShareNotFound {
				t.Errorf("wrong error has been returned: %v", err)
			}
		})

		t.Run("share can be listed", func(t *testing.T) {
			shares, err := store.GetShares()
			if err != nil {
				t.Errorf("error getting shares: %v", err)
				return
			}

			if len(shares) != 1 {
				t.Errorf("invalid number of shares: %d", len(shares))
				return
			}

			if shares[0].UUID != share.UUID {
				t.Errorf("unexpected uuid")
			}
			if shares[0].Name != "a name" {
				t.Errorf("unexpected name")
			}
			if shares[0].Description != "some desc" {
				t.Errorf("unexpected description")
			}
		})

		t.Run("share can be removed", func(t *testing.T) {
			if err := store.RemoveShare(share.UUID); err != nil {
				t.Errorf("removing share failed: %v", err)
			}
		})
	})

	t.Run("share access should work", func(t *testing.T) {
		share1, _ := store.CreateShare()
		share2, _ := store.CreateShare()
		share3, _ := store.CreateShare()

		user1 := User{Username: "user1"}
		user2 := User{Username: "user2"}
		_ = store.AddUser(user1)
		_ = store.AddUser(user2)

		defer func() {
			_ = store.RemoveUser(user1.Username)
			_ = store.RemoveUser(user2.Username)
		}()

		t.Run("multiple shares should exist", func(t *testing.T) {
			shares, _ := store.GetShares()
			if len(shares) != 3 {
				t.Errorf("3 shares should exist")
			}
		})

		t.Run("can add users to shares", func(t *testing.T) {
			if err := store.AddUserToShare(share1, user1.Username, ShareRoleAdmin); err != nil {
				t.Errorf("cannot add user1 to share1: %v", err)
			}
			if err := store.AddUserToShare(share1, user2.Username, ShareRoleReader); err != nil {
				t.Errorf("cannot add user2 to share1: %v", err)
			}
			if err := store.AddUserToShare(share2, user2.Username, ShareRoleAdmin); err != nil {
				t.Errorf("cannot add user2 to share2: %v", err)
			}

			t.Run("cannot add login if user doesn't exist", func(t *testing.T) {
				if err := store.AddLogin(share3, user1.Username, Login{"foo", "", false}); err == nil {
					t.Errorf("an error should have been returned")
				} else if err != ErrUserNotFound {
					t.Errorf("wrong error has been returned: %v", err)
				}
			})

			t.Run("can list users", func(t *testing.T) {
				users, err := store.GetShareUsers(share1)
				if err != nil {
					t.Errorf("unexpected error: %v", err)
				}
				if len(users) != 2 {
					t.Errorf("unexpected amount of users: %d", len(users))
				}
			})

			t.Run("can find shares by user", func(t *testing.T) {
				userShares, err := store.FindSharesByUser(user2.Username)
				if err != nil {
					t.Errorf("unexpected error: %v", err)
				}
				if len(userShares) != 2 {
					t.Errorf("unexpected amount of shared: %d", len(userShares))
				}
				share1Found := false
				share2Found := false
				for _, userShare := range userShares {
					switch userShare.UUID {
					case share1.UUID:
						if userShare.Role != ShareRoleReader {
							t.Errorf("invalid role for share1: %v", userShare.Role)
						}
						share1Found = true
					case share2.UUID:
						if userShare.Role != ShareRoleAdmin {
							t.Errorf("invalid role for share2: %v", userShare.Role)
						}
						share2Found = true
					}
				}

				if !share1Found {
					t.Errorf("share1 was not found")
				}
				if !share2Found {
					t.Errorf("share2 was not found")
				}
			})

			t.Run("logins can be added", func(t *testing.T) {
				login1 := Login{LoginName: "login1"}
				login2 := Login{LoginName: "login2"}
				login3 := Login{LoginName: "login3"}

				if err := store.AddLogin(share1, user1.Username, login1); err != nil {
					t.Errorf("adding login returned error: %v", err)
				}
				if err := store.AddLogin(share1, user2.Username, login2); err != nil {
					t.Errorf("adding login returned error: %v", err)
				}
				if err := store.AddLogin(share1, user2.Username, login3); err != nil {
					t.Errorf("adding login returned error: %v", err)
				}

				t.Run("can list logins", func(t *testing.T) {
					logins, err := store.GetShareLogins(share1, user2.Username)
					if err != nil {
						t.Errorf("unexpected error: %v", err)
					}
					if len(logins) != 2 {
						t.Errorf("unexpected amount of users: %d", len(logins))
					}
				})

				t.Run("duplicate login not allowed", func(t *testing.T) {
					// Different share, but same user:login pair as above. Must be a share where
					// that user is already assigned, though.
					if err := store.AddLogin(share2, user2.Username, login2); err != ErrLoginDuplicate {
						t.Errorf("unexpected error: %v", err)
					}
				})

				t.Run("share is found by login", func(t *testing.T) {
					share, err := store.FindShareByLogin(user1.Username, login1.LoginName)
					if err != nil {
						t.Errorf("unexpected error: %v", err)
					}
					if share.UUID != share1.UUID {
						t.Errorf("wrong share returned")
					}
				})

				t.Run("unknown login/share combination returns error", func(t *testing.T) {
					if _, err := store.FindShareByLogin(user1.Username, login3.LoginName); err != ErrShareNotFound {
						t.Errorf("unexpected error: %v", err)
					}
				})

				t.Run("login can be removed", func(t *testing.T) {
					if err := store.RemoveLogin(share1, user1.Username, login1.LoginName); err != nil {
						t.Errorf("unexpected error: %v", err)
					}
					if _, err := store.FindShareByLogin(user1.Username, login1.LoginName); err != ErrShareNotFound {
						t.Errorf("share should not be found now, but returned: %v", err)
					}
				})

				t.Run("user can be removed", func(t *testing.T) {
					if err := store.RemoveUserFromShare(share1, user2.Username); err != nil {
						t.Errorf("unexpected error: %v", err)
					}
					if _, err := store.FindShareByLogin(user2.Username, login2.LoginName); err != ErrShareNotFound {
						t.Errorf("share should not be found now, but returned: %v", err)
					}
				})
			})
		})

		t.Run("can remove shares", func(t *testing.T) {
			if err := store.RemoveShare(share1.UUID); err != nil {
				t.Errorf("cannot remove share1: %v", err)
			}
			if err := store.RemoveShare(share2.UUID); err != nil {
				t.Errorf("cannot remove share2: %v", err)
			}
			if err := store.RemoveShare(share3.UUID); err != nil {
				t.Errorf("cannot remove share3: %v", err)
			}
		})
	})

	t.Run("database should be empty now", func(t *testing.T) {
		// checks that we properly deleted all keys
		if err := store.db.View(func(tx *buntdb.Tx) error {
			return tx.Ascend("", func(key, value string) bool {
				t.Errorf("leftover key found: %v", key)
				return true
			})
		}); err != nil {
			t.Errorf("iterating keys failed: %v", err)
		}
	})
}