package account

import (
	"arimelody-web/model"
	repository "arimelody-web/repository/account"
	"log"
	"os"
	"testing"
    "gotest.tools/v3/assert"
)

var (
    service *AccountService
)

func init() {
    devNullFile, err := os.OpenFile(os.DevNull, os.O_RDWR, 0666)
    if err != nil { panic(err) }
    defer devNullFile.Close()

    repo := repository.NewAccountRepositoryMemory(make([]*model.Account, 0))
    service = NewAccountService(
        repo,
        log.New(devNullFile, "", model.DEFAULT_LOG_FLAGS),
    )
}

// Tests the account lifecycle. Users:
// - [x] can create account
// - [x] can't create duplicate account
// - [x] can change username
// - [x] can change password
// - [x] can change email
// - [x] can change avatar URL
// - [x] can increment auth failures
// - [x] can reset auth failures
// - [x] can lock account
// - [x] can unlock account
// - [x] can delete account
func Test_Account(t *testing.T) {
    username := "testificate"
    password := "the amazing digital data breach"
    email := "goober@arimelody.space"
    avatarURL := "/img/default-avatar.webp"

    var id string
    var err error

    t.Run("accounts should start empty", func(t *testing.T) {
        t.Run("count is zero", func(t *testing.T) {
            if num, err := service.GetCount(); err != nil {
                t.Errorf("Failed to get number of accounts: %v", err)
            } else {
                assert.Equal(t, num, 0)
            }
        })

        t.Run("service returns empty array", func(t *testing.T) {
            if accounts, err := service.GetAll(); err != nil {
                t.Errorf("Failed to get number of accounts: %v", err)
            } else {
                assert.Equal(t, len(accounts), 0)
            }
        })
    })

    t.Run("can create account", func(t *testing.T) {
        id, err = service.Create(username, password, &email, &avatarURL)
        if err != nil {
            t.Errorf("Failed to create account: %v", err)
        }

        t.Run("and fetch by ID", func(t *testing.T) {
            account, err := service.GetByID(id)
            if err != nil {
                t.Errorf("Failed to get account after creation: %v", err)
            }

            assert.Equal(t, account.Username, username)
            assert.Equal(t, account.Password, password)
            assert.Equal(t, account.Email.String, email)
            assert.Equal(t, account.AvatarURL.String, avatarURL)
            assert.Equal(t, account.FailAttempts, 0)
            assert.Equal(t, account.Locked, false)
        })
        t.Run("and fetch by username", func(t *testing.T) {
            account, err := service.GetByUsername(username)
            if err != nil {
                t.Errorf("Failed to get account after creation: %v", err)
            }

            assert.Equal(t, account.ID, id)
            assert.Equal(t, account.Password, password)
            assert.Equal(t, account.Email.String, email)
            assert.Equal(t, account.AvatarURL.String, avatarURL)
            assert.Equal(t, account.FailAttempts, 0)
            assert.Equal(t, account.Locked, false)
        })
        t.Run("and fetch by email", func(t *testing.T) {
            account, err := service.GetByEmail(email)
            if err != nil {
                t.Errorf("Failed to get account after creation: %v", err)
            }

            assert.Equal(t, account.ID, id)
            assert.Equal(t, account.Username, username)
            assert.Equal(t, account.Password, password)
            assert.Equal(t, account.AvatarURL.String, avatarURL)
            assert.Equal(t, account.FailAttempts, 0)
            assert.Equal(t, account.Locked, false)
        })
    })

    t.Run("number of accounts should increment", func(t *testing.T) {
        t.Run("count is one", func(t *testing.T) {
            if num, err := service.GetCount(); err != nil {
                t.Errorf("Failed to get number of accounts: %v", err)
            } else {
                assert.Equal(t, num, 1)
            }
        })

        t.Run("service returns array with one account", func(t *testing.T) {
            if accounts, err := service.GetAll(); err != nil {
                t.Errorf("Failed to get number of accounts: %v", err)
            } else {
                assert.Equal(t, len(accounts), 1)
            }
        })
    })

    t.Run("can't create duplicate account", func(t *testing.T) {
        _, err := service.Create(username, password, &email, &avatarURL)
        if err == nil {
            t.Error("Duplicate account was created")
        }
    })

    t.Run("can change username", func(t *testing.T) {
        testUsername := "some_other_name"
        if err := service.ChangeUsername(id, testUsername); err != nil {
            t.Errorf("Failed to change username: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if account.Username != testUsername {
            t.Error("Username did not update")
        }

        t.Run("but not to an invalid value", func(t *testing.T) {
            if err := service.ChangeUsername(id, ""); err == nil {
                t.Error("Could change username to invalid value")
            }
        })
    })

    t.Run("can change password", func(t *testing.T) {
        testPassword := "other more different password"
        if err := service.ChangePassword(id, testPassword); err != nil {
            t.Errorf("Failed to change password: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if account.Password != testPassword {
            t.Error("Password did not update")
        }

        t.Run("but not to an invalid value", func(t *testing.T) {
            if err := service.ChangePassword(id, ""); err == nil {
                t.Error("Could change password to invalid value")
            }
        })
    })

    t.Run("can change email", func(t *testing.T) {
        testEmail := "brandnewemail@for.me"
        if err := service.ChangeEmail(id, testEmail); err != nil {
            t.Errorf("Failed to change email: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if !account.Email.Valid || account.Email.String != testEmail {
            t.Error("Email did not update")
        }
    })

    t.Run("can remove email", func(t *testing.T) {
        if err := service.ChangeEmail(id, ""); err != nil {
            t.Errorf("Failed to change email: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if account.Email.Valid || len(account.Email.String) > 0 {
            t.Error("Email did not update")
        }
    })

    t.Run("can change avatar URL", func(t *testing.T) {
        testAvatarURL := "/img/some-other-avatar.webp"
        if err := service.ChangeAvatarURL(id, testAvatarURL); err != nil {
            t.Errorf("Failed to change avatar URL: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if !account.AvatarURL.Valid || account.AvatarURL.String != testAvatarURL {
            t.Error("Avatar URL did not update")
        }
    })

    t.Run("can remove avatar URL", func(t *testing.T) {
        if err := service.ChangeAvatarURL(id, ""); err != nil {
            t.Errorf("Failed to change avatar URL: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else if account.AvatarURL.Valid || len(account.AvatarURL.String) > 0 {
            t.Error("Avatar URL did not update")
        }
    })

    t.Run("can increment auth failures", func(t *testing.T) {
        if num, err := service.IncrementFails(id); err != nil {
            t.Errorf("Failed to increment account auth failures: %v", err)
        } else {
            assert.Equal(t, num, 1)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else {
            assert.Equal(t, account.FailAttempts, 1)
        }
    })

    t.Run("can reset auth failures", func(t *testing.T) {
        if err := service.ResetFails(id); err != nil {
            t.Errorf("Failed to reset account auth failures: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else {
            assert.Equal(t, account.FailAttempts, 0)
        }
    })

    t.Run("can lock account", func(t *testing.T) {
        if err := service.Lock(id); err != nil {
            t.Errorf("Failed to lock account: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else {
            assert.Equal(t, account.Locked, true)
        }
    })

    t.Run("can unlock account", func(t *testing.T) {
        if err := service.Unlock(id); err != nil {
            t.Errorf("Failed to unlock account: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account: %v", err)
        } else if account == nil {
            t.Error("Account is nil after update")
        } else {
            assert.Equal(t, account.Locked, false)
        }
    })

    t.Run("can delete account", func(t *testing.T) {
        if err = service.Delete(id); err != nil {
            t.Errorf("Failed to delete account: %v", err)
        }

        if account, err := service.GetByID(id); err != nil {
            t.Errorf("Failed to get account after deletion: %v", err)
        } else if account != nil {
            t.Error("Account still exists after deletion")
        }
    })

    t.Run("can't create an account with invalid", func(t *testing.T) {
        t.Run("username", func(t *testing.T) {
            if _, err := service.Create("", password, &email, &avatarURL); err == nil {
                t.Error("Could create account with empty username")
            }
        })

        t.Run("password", func(t *testing.T) {
            if _, err := service.Create(username, "", &email, &avatarURL); err == nil {
                t.Error("Could create account with empty password")
            }
        })

        t.Run("email", func(t *testing.T) {
            testEmail := ""
            if _, err := service.Create(username, password, &testEmail, &avatarURL); err == nil {
                t.Error("Could create account with empty (non-nil) email")
            }
        })
    })

    t.Run("can't update account that doesn't exist", func(t *testing.T) {
        garbageAccountID := "adsginh534g9405gmb40i9bm"

        t.Run("username", func(t *testing.T) {
            if err := service.ChangeUsername(garbageAccountID, "some-username"); err == nil {
                t.Error("Could update non-existent account's username")
            }
        })

        t.Run("password", func(t *testing.T) {
            if err := service.ChangePassword(garbageAccountID, "some-password"); err == nil {
                t.Error("Could update non-existent account's password")
            }
        })

        t.Run("email", func(t *testing.T) {
            if err := service.ChangeEmail(garbageAccountID, "some-email@real.gov"); err == nil {
                t.Error("Could update non-existent account's email")
            }
        })

        t.Run("avatar URL", func(t *testing.T) {
            if err := service.ChangeAvatarURL(garbageAccountID, "/img/null.webp"); err == nil {
                t.Error("Could update non-existent account's avatar URL")
            }
        })
    })

    t.Cleanup(func() {
        if err := service.Delete(id); err != nil {
            t.Errorf("Failed to clean up test case: %v", err)
        }
    })
}