package gstreamer

import (
	"context"
	"github.com/rs/zerolog"
	"github.com/tinyzimmer/go-gst/gst"
	"sync"
	"time"
)

type Gstreamer struct {
	pipelineSlots  map[string][]string
	Pipelines      map[string]*Pipeline
	notifyOnUpdate map[string][]NotifyOnPipelineUpdate
	*Decklink
	ctx context.Context
	sync.RWMutex
}

type NotifyOnPipelineUpdate func(pipeline *Pipeline)

type Pipeline struct {
	Name            string
	ID              string
	InputElement    InputElement
	OutputElement   OutputElement
	Overlays        map[string]Overlay
	PipelineUpdates chan PipelineUpdates
	notifyOnUpdate  []NotifyOnPipelineUpdate
	pipeline        *gst.Pipeline
	logger          zerolog.Logger
	elements        map[string]element
	ctx             context.Context
	ctxCancel       context.CancelFunc
	sync.RWMutex
}

type Decklink struct {
	Slots map[string]string
	sync.RWMutex
}

type PipelineUpdates struct {
	Overlays map[string]Overlay
}

type element struct {
	prev, next string
	element    *gst.Element
	name       string
	inputCaps  []string
	outputCaps []string
}

type Overlay interface {
	getName() string
	create(log zerolog.Logger) (*gst.Element, error)
	getBlendInTime() time.Duration
	getBlendOutTime() time.Duration
	show() gst.ClockCallback
	hide() gst.ClockCallback
	update(log zerolog.Logger)
	getElement() *gst.Element
	setElement(element *gst.Element)
	getType() string
}

type ImageOverlay struct {
	element  *gst.Element
	Name     string
	Path     string
	X, Y     int
	Display  bool
	BlendIn  time.Duration
	BlendOut time.Duration
}

type TextOverlay struct {
	element    *gst.Element
	Name       string
	X, Y       int
	Font       string
	FontSize   int
	FontWeight string
	Color      uint32
	Value      string
	Display    bool
	MaxWidth   uint
	BlendIn    time.Duration
	BlendOut   time.Duration
}

type InputElement struct {
	Name       string
	Type       string
	Properties map[string]string
	Caps       []string
	elements   map[string]element
}

type OutputElement struct {
	Name       string
	Type       string
	Properties map[string]string
	Caps       []string
	elements   map[string]element
}