package api_impl

// SPDX-License-Identifier: GPL-3.0-or-later

// This file contains the interfaces used by the package. They are intended to
// allow swapping actual services with mocked versions for unit tests.

import (
	"context"
	"io"
	"time"

	"github.com/benbjohnson/clock"
	"github.com/rs/zerolog"

	"git.blender.org/flamenco/internal/manager/config"
	"git.blender.org/flamenco/internal/manager/job_compilers"
	"git.blender.org/flamenco/internal/manager/last_rendered"
	"git.blender.org/flamenco/internal/manager/persistence"
	"git.blender.org/flamenco/internal/manager/task_state_machine"
	"git.blender.org/flamenco/internal/manager/webupdates"
	"git.blender.org/flamenco/pkg/api"
	"git.blender.org/flamenco/pkg/shaman"
)

// Generate mock implementations of these interfaces.
//go:generate go run github.com/golang/mock/mockgen -destination mocks/api_impl_mock.gen.go -package mocks git.blender.org/flamenco/internal/manager/api_impl PersistenceService,ChangeBroadcaster,JobCompiler,LogStorage,ConfigService,TaskStateMachine,Shaman,LastRendered,LocalStorage

type PersistenceService interface {
	StoreAuthoredJob(ctx context.Context, authoredJob job_compilers.AuthoredJob) error
	// FetchJob fetches a single job, without fetching its tasks.
	FetchJob(ctx context.Context, jobID string) (*persistence.Job, error)
	// FetchTask fetches the given task and the accompanying job.
	FetchTask(ctx context.Context, taskID string) (*persistence.Task, error)
	FetchTaskFailureList(context.Context, *persistence.Task) ([]*persistence.Worker, error)
	SaveTask(ctx context.Context, task *persistence.Task) error
	SaveTaskActivity(ctx context.Context, t *persistence.Task) error
	// TaskTouchedByWorker marks the task as 'touched' by a worker. This is used for timeout detection.
	TaskTouchedByWorker(context.Context, *persistence.Task) error

	CreateWorker(ctx context.Context, w *persistence.Worker) error
	FetchWorker(ctx context.Context, uuid string) (*persistence.Worker, error)
	FetchWorkers(ctx context.Context) ([]*persistence.Worker, error)
	SaveWorker(ctx context.Context, w *persistence.Worker) error
	SaveWorkerStatus(ctx context.Context, w *persistence.Worker) error
	WorkerSeen(ctx context.Context, w *persistence.Worker) error

	// ScheduleTask finds a task to execute by the given worker, and assigns it to that worker.
	// If no task is available, (nil, nil) is returned, as this is not an error situation.
	ScheduleTask(ctx context.Context, w *persistence.Worker) (*persistence.Task, error)
	AddWorkerToTaskFailedList(context.Context, *persistence.Task, *persistence.Worker) (numFailed int, err error)
	// ClearFailureListOfTask clears the list of workers that failed this task.
	ClearFailureListOfTask(context.Context, *persistence.Task) error
	// ClearFailureListOfJob en-mass, for all tasks of this job, clears the list of workers that failed those tasks.
	ClearFailureListOfJob(context.Context, *persistence.Job) error

	// AddWorkerToJobBlocklist prevents this Worker of getting any task, of this type, on this job, from the task scheduler.
	AddWorkerToJobBlocklist(ctx context.Context, job *persistence.Job, worker *persistence.Worker, taskType string) error
	FetchJobBlocklist(ctx context.Context, jobUUID string) ([]persistence.JobBlock, error)
	RemoveFromJobBlocklist(ctx context.Context, jobUUID, workerUUID, taskType string) error
	ClearJobBlocklist(ctx context.Context, job *persistence.Job) error

	// WorkersLeftToRun returns a set of worker UUIDs that can run tasks of the given type on the given job.
	WorkersLeftToRun(ctx context.Context, job *persistence.Job, taskType string) (map[string]bool, error)
	// CountTaskFailuresOfWorker returns the number of task failures of this worker, on this particular job and task type.
	CountTaskFailuresOfWorker(ctx context.Context, job *persistence.Job, worker *persistence.Worker, taskType string) (int, error)

	// Database queries.
	QueryJobs(ctx context.Context, query api.JobsQuery) ([]*persistence.Job, error)
	QueryJobTaskSummaries(ctx context.Context, jobUUID string) ([]*persistence.Task, error)

	// SetLastRendered sets this job as the one with the most recent rendered image.
	SetLastRendered(ctx context.Context, j *persistence.Job) error
	// GetLastRendered returns the UUID of the job with the most recent rendered image.
	GetLastRenderedJobUUID(ctx context.Context) (string, error)
}

var _ PersistenceService = (*persistence.DB)(nil)

type TaskStateMachine interface {
	// TaskStatusChange gives a Task a new status, and handles the resulting status changes on the job.
	TaskStatusChange(ctx context.Context, task *persistence.Task, newStatus api.TaskStatus) error

	// JobStatusChange gives a Job a new status, and handles the resulting status changes on its tasks.
	JobStatusChange(ctx context.Context, job *persistence.Job, newJobStatus api.JobStatus, reason string) error

	RequeueActiveTasksOfWorker(ctx context.Context, worker *persistence.Worker, reason string) error
	RequeueFailedTasksOfWorkerOfJob(ctx context.Context, worker *persistence.Worker, job *persistence.Job, reason string) error
}

// TaskStateMachine should be a subset of task_state_machine.StateMachine.
var _ TaskStateMachine = (*task_state_machine.StateMachine)(nil)

type ChangeBroadcaster interface {
	// BroadcastNewJob sends a 'new job' notification to all SocketIO clients.
	BroadcastNewJob(jobUpdate api.SocketIOJobUpdate)
	BroadcastLastRenderedImage(update api.SocketIOLastRenderedUpdate)

	// Note that there is no BroadcastNewTask. The 'new job' broadcast is sent
	// after the job's tasks have been created, and thus there is no need for a
	// separate broadcast per task.

	// Note that there is no call to BoardcastTaskLogUpdate. It's the
	// responsibility of `LogStorage.Write` to broadcast the changes to SocketIO
	// clients.

	BroadcastWorkerUpdate(workerUpdate api.SocketIOWorkerUpdate)
	BroadcastNewWorker(workerUpdate api.SocketIOWorkerUpdate)
}

// ChangeBroadcaster should be a subset of webupdates.BiDirComms.
var _ ChangeBroadcaster = (*webupdates.BiDirComms)(nil)

type JobCompiler interface {
	ListJobTypes() api.AvailableJobTypes
	GetJobType(typeName string) (api.AvailableJobType, error)
	Compile(ctx context.Context, job api.SubmittedJob) (*job_compilers.AuthoredJob, error)
}

// LogStorage handles incoming task logs.
type LogStorage interface {
	Write(logger zerolog.Logger, jobID, taskID string, logText string) error
	WriteTimestamped(logger zerolog.Logger, jobID, taskID string, logText string) error
	RotateFile(logger zerolog.Logger, jobID, taskID string)
	Tail(jobID, taskID string) (string, error)
}

// LastRendered processes the "last rendered" images.
type LastRendered interface {
	// QueueImage queues an image for processing. Returns
	// `last_rendered.ErrQueueFull` if there is no more space in the queue for
	// new images.
	QueueImage(payload last_rendered.Payload) error

	// PathForJob returns the base path for this job's last-rendered images.
	PathForJob(jobUUID string) string

	// ThumbSpecs returns the thumbnail specifications.
	ThumbSpecs() []last_rendered.Thumbspec

	// JobHasImage returns true only if the job actually has a last-rendered image.
	JobHasImage(jobUUID string) bool
}

// LocalStorage handles the storage organisation of local files like the last-rendered images.
type LocalStorage interface {
	// RelPath tries to make the given path relative to the local storage root.
	// Assumes `path` is already an absolute path.
	RelPath(path string) (string, error)
}

type ConfigService interface {
	VariableReplacer

	Get() *config.Conf

	// EffectiveStoragePath returns the job storage path used by Flamenco. It's
	// basically the configured storage path, but can be influenced by other
	// options (like Shaman).
	EffectiveStoragePath() string

	// IsFirstRun returns true if this is likely to be the first run of Flamenco.
	IsFirstRun() (bool, error)

	// ForceFirstRun forces IsFirstRun() to return true. This is used to force the
	// first-time wizard on a configured system.
	ForceFirstRun()
}

type Shaman interface {
	// IsEnabled returns whether this Shaman service is enabled or not.
	IsEnabled() bool

	// Checkout creates a directory, and symlinks the required files into it. The
	// files must all have been uploaded to Shaman before calling this.
	// Returns the final checkout directory, as it may be modified to ensure uniqueness.
	Checkout(ctx context.Context, checkout api.ShamanCheckout) (string, error)

	// Requirements checks a Shaman Requirements file, and returns the subset
	// containing the unknown files.
	Requirements(ctx context.Context, requirements api.ShamanRequirementsRequest) (api.ShamanRequirementsResponse, error)

	// Check the status of a file on the Shaman server.
	FileStoreCheck(ctx context.Context, checksum string, filesize int64) api.ShamanFileStatus

	// Store a new file on the Shaman server. Note that the Shaman server can
	// return early when another client finishes uploading the exact same file, to
	// prevent double uploads.
	FileStore(ctx context.Context, file io.ReadCloser, checksum string, filesize int64, canDefer bool, originalFilename string) error
}

var _ Shaman = (*shaman.Server)(nil)

// TimeService provides functionality from the stdlib `time` module, but in a
// way that allows mocking.
type TimeService interface {
	Now() time.Time
}

var _ TimeService = (clock.Clock)(nil)