// inferBuildTypes infers build status and mismatches between source and docker builders
func (c *AppConfig) inferBuildTypes(components app.ComponentReferences) (app.ComponentReferences, error) {
	errs := []error{}
	for _, ref := range components {
		input := ref.Input()

		// identify whether the input is a builder and whether generation is requested
		input.ResolvedMatch.Builder = app.IsBuilderMatch(input.ResolvedMatch)
		generatorInput, err := app.GeneratorInputFromMatch(input.ResolvedMatch)
		if err != nil && !c.AllowGenerationErrors {
			errs = append(errs, err)
			continue
		}
		input.ResolvedMatch.GeneratorInput = generatorInput

		// if the strategy is explicitly Docker, all repos should assume docker
		if c.Strategy == "docker" && input.Uses != nil {
			input.Uses.BuildWithDocker()
		}

		// if we are expecting build inputs, or get a build input when strategy is not docker, expect to build
		if c.ExpectToBuild || (input.ResolvedMatch.Builder && c.Strategy != "docker") {
			input.ExpectToBuild = true
		}

		switch {
		case input.ExpectToBuild && input.ResolvedMatch.IsTemplate():
			// TODO: harder - break the template pieces and check if source code can be attached (look for a build config, build image, etc)
			errs = append(errs, fmt.Errorf("template with source code explicitly attached is not supported - you must either specify the template and source code separately or attach an image to the source code using the '[image]~[code]' form"))
			continue
		case input.ExpectToBuild && !input.ResolvedMatch.Builder && input.Uses != nil && !input.Uses.IsDockerBuild():
			if len(c.Strategy) == 0 {
				errs = append(errs, fmt.Errorf("the resolved match %q for component %q cannot build source code - check whether this is the image you want to use, then use --strategy=source to build using source or --strategy=docker to treat this as a Docker base image and set up a layered Docker build", input.ResolvedMatch.Name, ref))
				continue
			}
		case input.ResolvedMatch.Score != 0.0:
			errs = append(errs, fmt.Errorf("component %q had only a partial match of %q - if this is the value you want to use, specify it explicitly", input.From, input.ResolvedMatch.Name))
			continue
		}
	}
	if len(components) == 0 && c.BinaryBuild {
		if len(c.Name) == 0 {
			return nil, fmt.Errorf("you must provide a --name when you don't specify a source repository or base image")
		}
		ref := &app.ComponentInput{
			From:          "--binary",
			Argument:      "--binary",
			Value:         c.Name,
			ScratchImage:  true,
			ExpectToBuild: true,
		}
		components = append(components, ref)
	}

	return components, errors.NewAggregate(errs)
}

// InferBuildTypes infers build status and mismatches between source and docker builders
func InferBuildTypes(components app.ComponentReferences, g *GenerationInputs) (app.ComponentReferences, error) {
	errs := []error{}
	for _, ref := range components {
		input := ref.Input()

		// identify whether the input is a builder and whether generation is requested
		input.ResolvedMatch.Builder = app.IsBuilderMatch(input.ResolvedMatch)
		generatorInput, err := app.GeneratorInputFromMatch(input.ResolvedMatch)
		if err != nil && !g.AllowGenerationErrors {
			errs = append(errs, err)
			continue
		}
		input.ResolvedMatch.GeneratorInput = generatorInput

		// if the strategy is set explicitly, apply it to all repos.
		// for example, this affects repos specified in the form image~source.
		if g.Strategy != generate.StrategyUnspecified && input.Uses != nil {
			input.Uses.SetStrategy(g.Strategy)
		}

		// if we are expecting build inputs, or get a build input when strategy is not docker, expect to build
		if g.ExpectToBuild || (input.ResolvedMatch.Builder && g.Strategy != generate.StrategyDocker) {
			input.ExpectToBuild = true
		}

		switch {
		case input.ExpectToBuild && input.ResolvedMatch.IsTemplate():
			// TODO: harder - break the template pieces and check if source code can be attached (look for a build config, build image, etc)
			errs = append(errs, errors.New("template with source code explicitly attached is not supported - you must either specify the template and source code separately or attach an image to the source code using the '[image]~[code]' form"))
			continue
		}
	}
	if len(components) == 0 && g.BinaryBuild && g.Strategy == generate.StrategySource {
		return nil, errors.New("you must provide a builder image when using the source strategy with a binary build")
	}
	if len(components) == 0 && g.BinaryBuild {
		if len(g.Name) == 0 {
			return nil, errors.New("you must provide a --name when you don't specify a source repository or base image")
		}
		ref := &app.ComponentInput{
			From:          "--binary",
			Argument:      "--binary",
			Value:         g.Name,
			ScratchImage:  true,
			ExpectToBuild: true,
		}
		components = append(components, ref)
	}

	return components, kutilerrors.NewAggregate(errs)
}

// validateBuilders confirms that all images associated with components that are to be built,
// are builders (or we're using a non-source strategy).
func (c *AppConfig) validateBuilders(components app.ComponentReferences) error {
	if c.Strategy != generate.StrategyUnspecified {
		return nil
	}
	errs := []error{}
	for _, ref := range components {
		input := ref.Input()
		// if we're supposed to build this thing, and the image/imagestream we've matched it to did not come from an explicit CLI argument,
		// and the image/imagestream we matched to is not explicitly an s2i builder, and we're doing a source-type build, warn the user
		// that this probably won't work and force them to declare their intention explicitly.
		if input.ExpectToBuild && input.ResolvedMatch != nil && !app.IsBuilderMatch(input.ResolvedMatch) && input.Uses != nil && input.Uses.GetStrategy() == generate.StrategySource {
			errs = append(errs, fmt.Errorf("the image match %q for source repository %q does not appear to be a source-to-image builder.\n\n- to attempt to use this image as a source builder, pass \"--strategy=source\"\n- to use it as a base image for a Docker build, pass \"--strategy=docker\"", input.ResolvedMatch.Name, input.Uses))
			continue
		}
	}
	return kutilerrors.NewAggregate(errs)
}