package executor

import (
	"flag"
	"fmt"

	"codeflow.dananglin.me.uk/apollo/enbas/internal/client"
	"codeflow.dananglin.me.uk/apollo/enbas/internal/model"
	"codeflow.dananglin.me.uk/apollo/enbas/internal/utilities"
)

type CreateExecutor struct {
	*flag.FlagSet

	topLevelFlags     TopLevelFlags
	boostable         bool
	federated         bool
	likeable          bool
	replyable         bool
	sensitive         bool
	content           string
	contentType       string
	fromFile          string
	language          string
	spoilerText       string
	resourceType      string
	listTitle         string
	listRepliesPolicy string
	visibility        string
}

func NewCreateExecutor(tlf TopLevelFlags, name, summary string) *CreateExecutor {
	createExe := CreateExecutor{
		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),

		topLevelFlags: tlf,
	}

	createExe.BoolVar(&createExe.boostable, flagEnableReposts, true, "specify if the status can be reposted/boosted by others")
	createExe.BoolVar(&createExe.federated, flagEnableFederation, true, "specify if the status can be federated beyond the local timelines")
	createExe.BoolVar(&createExe.likeable, flagEnableLikes, true, "specify if the status can be liked/favourited")
	createExe.BoolVar(&createExe.replyable, flagEnableReplies, true, "specify if the status can be replied to")
	createExe.BoolVar(&createExe.sensitive, flagSensitive, false, "specify if the status should be marked as sensitive")
	createExe.StringVar(&createExe.content, flagContent, "", "the content of the status to create")
	createExe.StringVar(&createExe.contentType, flagContentType, "plain", "the type that the contents should be parsed from (valid values are plain and markdown)")
	createExe.StringVar(&createExe.fromFile, flagFromFile, "", "the file path where to read the contents from")
	createExe.StringVar(&createExe.language, flagLanguage, "", "the ISO 639 language code for this status")
	createExe.StringVar(&createExe.spoilerText, flagSpoilerText, "", "the text to display as the status' warning or subject")
	createExe.StringVar(&createExe.visibility, flagVisibility, "", "the visibility of the posted status")
	createExe.StringVar(&createExe.resourceType, flagType, "", "specify the type of resource to create")
	createExe.StringVar(&createExe.listTitle, flagListTitle, "", "specify the title of the list")
	createExe.StringVar(&createExe.listRepliesPolicy, flagListRepliesPolicy, "list", "specify the policy of the replies for this list (valid values are followed, list and none)")

	createExe.Usage = commandUsageFunc(name, summary, createExe.FlagSet)

	return &createExe
}

func (c *CreateExecutor) Execute() error {
	if c.resourceType == "" {
		return FlagNotSetError{flagText: flagType}
	}

	gtsClient, err := client.NewClientFromConfig(c.topLevelFlags.ConfigDir)
	if err != nil {
		return fmt.Errorf("unable to create the GoToSocial client; %w", err)
	}

	funcMap := map[string]func(*client.Client) error{
		resourceList:   c.createList,
		resourceStatus: c.createStatus,
	}

	doFunc, ok := funcMap[c.resourceType]
	if !ok {
		return UnsupportedTypeError{resourceType: c.resourceType}
	}

	return doFunc(gtsClient)
}

func (c *CreateExecutor) createList(gtsClient *client.Client) error {
	if c.listTitle == "" {
		return FlagNotSetError{flagText: flagListTitle}
	}

	parsedListRepliesPolicy := model.ParseListRepliesPolicy(c.listRepliesPolicy)
	if parsedListRepliesPolicy == model.ListRepliesPolicyUnknown {
		return InvalidListRepliesPolicyError{Policy: c.listRepliesPolicy}
	}

	form := client.CreateListForm{
		Title:         c.listTitle,
		RepliesPolicy: parsedListRepliesPolicy,
	}

	list, err := gtsClient.CreateList(form)
	if err != nil {
		return fmt.Errorf("unable to create the list; %w", err)
	}

	fmt.Println("Successfully created the following list:")
	fmt.Printf("\n%s\n", list)

	return nil
}

func (c *CreateExecutor) createStatus(gtsClient *client.Client) error {
	var (
		err        error
		content    string
		language   string
		visibility string
	)

	switch {
	case c.content != "":
		content = c.content
	case c.fromFile != "":
		content, err = utilities.ReadFile(c.fromFile)
		if err != nil {
			return fmt.Errorf("unable to get the status contents from %q; %w", c.fromFile, err)
		}
	default:
		return EmptyContentError{
			ResourceType: resourceStatus,
			Hint:         "please use --" + flagContent + " or --" + flagFromFile,
		}
	}

	preferences, err := gtsClient.GetUserPreferences()
	if err != nil {
		fmt.Println("WARNING: Unable to get your posting preferences; %w", err)
	}

	if c.language != "" {
		language = c.language
	} else {
		language = preferences.PostingDefaultLanguage
	}

	if c.visibility != "" {
		visibility = c.visibility
	} else {
		visibility = preferences.PostingDefaultVisibility
	}

	parsedVisibility := model.ParseStatusVisibility(visibility)
	if parsedVisibility == model.StatusVisibilityUnknown {
		return InvalidStatusVisibilityError{Visibility: visibility}
	}

	parsedContentType := model.ParseStatusContentType(c.contentType)
	if parsedContentType == model.StatusContentTypeUnknown {
		return InvalidStatusContentTypeError{ContentType: c.contentType}
	}

	form := client.CreateStatusForm{
		Content:     content,
		ContentType: parsedContentType,
		Language:    language,
		SpoilerText: c.spoilerText,
		Boostable:   c.boostable,
		Federated:   c.federated,
		Likeable:    c.likeable,
		Replyable:   c.replyable,
		Sensitive:   c.sensitive,
		Visibility:  parsedVisibility,
	}

	status, err := gtsClient.CreateStatus(form)
	if err != nil {
		return fmt.Errorf("unable to create the status; %w", err)
	}

	fmt.Println("Successfully created the following status:")
	fmt.Println(status)

	return nil
}