package redisstate

import (
	"context"
	"errors"
	"fmt"

	"galaxy/mail/internal/service/renderdelivery"

	"github.com/redis/go-redis/v9"
)

// RenderStore provides the Redis-backed durable storage used by the
// render-delivery use case.
type RenderStore struct {
	writer *AtomicWriter
}

// NewRenderStore constructs one Redis-backed render-delivery store.
func NewRenderStore(client *redis.Client) (*RenderStore, error) {
	if client == nil {
		return nil, errors.New("new render store: nil redis client")
	}

	writer, err := NewAtomicWriter(client)
	if err != nil {
		return nil, fmt.Errorf("new render store: %w", err)
	}

	return &RenderStore{writer: writer}, nil
}

// MarkRendered stores one successfully materialized template delivery.
func (store *RenderStore) MarkRendered(ctx context.Context, input renderdelivery.MarkRenderedInput) error {
	if store == nil || store.writer == nil {
		return errors.New("mark rendered in render store: nil store")
	}
	if ctx == nil {
		return errors.New("mark rendered in render store: nil context")
	}
	if err := input.Validate(); err != nil {
		return fmt.Errorf("mark rendered in render store: %w", err)
	}

	if err := store.writer.MarkRendered(ctx, MarkRenderedInput{
		Delivery: input.Delivery,
	}); err != nil {
		return fmt.Errorf("mark rendered in render store: %w", err)
	}

	return nil
}

// MarkRenderFailed stores one classified terminal render failure.
func (store *RenderStore) MarkRenderFailed(ctx context.Context, input renderdelivery.MarkRenderFailedInput) error {
	if store == nil || store.writer == nil {
		return errors.New("mark render failed in render store: nil store")
	}
	if ctx == nil {
		return errors.New("mark render failed in render store: nil context")
	}
	if err := input.Validate(); err != nil {
		return fmt.Errorf("mark render failed in render store: %w", err)
	}

	if err := store.writer.MarkRenderFailed(ctx, MarkRenderFailedInput{
		Delivery: input.Delivery,
		Attempt:  input.Attempt,
	}); err != nil {
		return fmt.Errorf("mark render failed in render store: %w", err)
	}

	return nil
}