// Copyright © 2017 Mikael Berthe <mikael@lilotux.net>

//

// Licensed under the MIT license.

// Please see the LICENSE file is this directory.

package printer

import (

	"fmt"

	"io"

	"os"

	"reflect"

	"time"

	"github.com/jaytaylor/html2text"

	"github.com/McKael/madon"

)

// PlainPrinter is the default "plain text" printer

type PlainPrinter struct {

	Indent      string

	NoSubtitles bool

}

// NewPrinterPlain returns a plaintext ResourcePrinter

// For PlainPrinter, the option parameter contains the indent prefix.

func NewPrinterPlain(option string) (*PlainPrinter, error) {

	indentInc := "  "

	if option != "" {

		indentInc = option

	}

	return &PlainPrinter{Indent: indentInc}, nil

}

// PrintObj sends the object as text to the writer

// If the writer w is nil, standard output will be used.

// For PlainPrinter, the option parameter contains the initial indent.

func (p *PlainPrinter) PrintObj(obj interface{}, w io.Writer, initialIndent string) error {

	if w == nil {

		w = os.Stdout

	}

	switch o := obj.(type) {

	case []madon.Account, []madon.Attachment, []madon.Card, []madon.Context,

		[]madon.Instance, []madon.Mention, []madon.Notification,

		[]madon.Relationship, []madon.Report, []madon.Results,

		[]madon.Status, []madon.StreamEvent, []madon.Tag:

		return p.plainForeach(o, w, initialIndent)

	case *madon.Account:

		return p.plainPrintAccount(o, w, initialIndent)

	case madon.Account:

		return p.plainPrintAccount(&o, w, initialIndent)

	case *madon.Attachment:

		return p.plainPrintAttachment(o, w, initialIndent)

	case madon.Attachment:

		return p.plainPrintAttachment(&o, w, initialIndent)

	case *madon.Card:

		return p.plainPrintCard(o, w, initialIndent)

	case madon.Card:

		return p.plainPrintCard(&o, w, initialIndent)

	case *madon.Context:

		return p.plainPrintContext(o, w, initialIndent)

	case madon.Context:

		return p.plainPrintContext(&o, w, initialIndent)

	case *madon.Instance:

		return p.plainPrintInstance(o, w, initialIndent)

	case madon.Instance:

		return p.plainPrintInstance(&o, w, initialIndent)

	case *madon.Notification:

		return p.plainPrintNotification(o, w, initialIndent)

	case madon.Notification:

		return p.plainPrintNotification(&o, w, initialIndent)

	case *madon.Relationship:

		return p.plainPrintRelationship(o, w, initialIndent)

	case madon.Relationship:

		return p.plainPrintRelationship(&o, w, initialIndent)

	case *madon.Report:

		return p.plainPrintReport(o, w, initialIndent)

	case madon.Report:

		return p.plainPrintReport(&o, w, initialIndent)

	case *madon.Results:

		return p.plainPrintResults(o, w, initialIndent)

	case madon.Results:

		return p.plainPrintResults(&o, w, initialIndent)

	case *madon.Status:

		return p.plainPrintStatus(o, w, initialIndent)

	case madon.Status:

		return p.plainPrintStatus(&o, w, initialIndent)

	case *madon.UserToken:

		return p.plainPrintUserToken(o, w, initialIndent)

	case madon.UserToken:

		return p.plainPrintUserToken(&o, w, initialIndent)

	}

	// TODO: Mention

	// TODO: StreamEvent

	// TODO: Tag

	return fmt.Errorf("PlainPrinter not yet implemented for %T (try json or yaml...)", obj)

}

func (p *PlainPrinter) plainForeach(ol interface{}, w io.Writer, ii string) error {

	switch reflect.TypeOf(ol).Kind() {

	case reflect.Slice:

		s := reflect.ValueOf(ol)

		for i := 0; i < s.Len(); i++ {

			o := s.Index(i).Interface()

			if err := p.PrintObj(o, w, ii); err != nil {

				return err

			}

		}

	}

	return nil

}

func html2string(h string) string {

	t, err := html2text.FromString(h)

	if err == nil {

		return t

	}

	return h // Failed: return initial string

}

func indentedPrint(w io.Writer, indent string, title, skipIfEmpty bool, label string, format string, args ...interface{}) {

	prefix := indent

	if title {

		prefix += "- "

	} else {

		prefix += "  "

	}

	value := fmt.Sprintf(format, args...)

	if !title && skipIfEmpty && len(value) == 0 {

		return

	}

	fmt.Fprintf(w, "%s%s: %s\n", prefix, label, value)

}

func (p *PlainPrinter) plainPrintAccount(a *madon.Account, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Account ID", "%d (%s)", a.ID, a.Username)

	indentedPrint(w, indent, false, false, "User ID", "%s", a.Acct)

	indentedPrint(w, indent, false, false, "Display name", "%s", a.DisplayName)

	indentedPrint(w, indent, false, false, "Creation date", "%v", a.CreatedAt.Local())

	indentedPrint(w, indent, false, false, "URL", "%s", a.URL)

	indentedPrint(w, indent, false, false, "Statuses count", "%d", a.StatusesCount)

	indentedPrint(w, indent, false, false, "Followers count", "%d", a.FollowersCount)

	indentedPrint(w, indent, false, false, "Following count", "%d", a.FollowingCount)

	if a.Locked {

		indentedPrint(w, indent, false, false, "Locked", "%v", a.Locked)

	}

	indentedPrint(w, indent, false, true, "User note", "%s", html2string(a.Note)) // XXX too long?

	return nil

}

func (p *PlainPrinter) plainPrintAttachment(a *madon.Attachment, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Attachment ID", "%d", a.ID)

	indentedPrint(w, indent, false, false, "Type", "%s", a.Type)

	indentedPrint(w, indent, false, false, "Local URL", "%s", a.URL)

	indentedPrint(w, indent, false, true, "Remote URL", "%s", a.RemoteURL)

	indentedPrint(w, indent, false, true, "Preview URL", "%s", a.PreviewURL)

	indentedPrint(w, indent, false, true, "Text URL", "%s", a.PreviewURL)

	return nil

}

func (p *PlainPrinter) plainPrintCard(c *madon.Card, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Card title", "%s", c.Title)

	indentedPrint(w, indent, false, true, "Description", "%s", c.Description)

	indentedPrint(w, indent, false, true, "URL", "%s", c.URL)

	indentedPrint(w, indent, false, true, "Image", "%s", c.Image)

	return nil

}

func (p *PlainPrinter) plainPrintContext(c *madon.Context, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Context", "%d relative(s)", len(c.Ancestors)+len(c.Descendents))

	if len(c.Ancestors) > 0 {

		indentedPrint(w, indent, false, false, "Ancestors", "")

		p.PrintObj(c.Ancestors, w, indent+p.Indent)

	}

	if len(c.Descendents) > 0 {

		indentedPrint(w, indent, false, false, "Descendents", "")

		p.PrintObj(c.Descendents, w, indent+p.Indent)

	}

	return nil

}

func (p *PlainPrinter) plainPrintInstance(i *madon.Instance, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Instance title", "%s", i.Title)

	indentedPrint(w, indent, false, true, "Description", "%s", html2string(i.Description))

	indentedPrint(w, indent, false, true, "URL", "%s", i.URI)

	indentedPrint(w, indent, false, true, "Email", "%s", i.Email)

	return nil

}

func (p *PlainPrinter) plainPrintNotification(n *madon.Notification, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Notification ID", "%d", n.ID)

	indentedPrint(w, indent, false, false, "Type", "%s", n.Type)

	indentedPrint(w, indent, false, false, "Timestamp", "%v", n.CreatedAt.Local())

	if n.Account != nil {

		indentedPrint(w, indent+p.Indent, true, false, "Account", "(%d) @%s - %s",

			n.Account.ID, n.Account.Acct, n.Account.DisplayName)

	}

	if n.Status != nil {

		p.plainPrintStatus(n.Status, w, indent+p.Indent)

	}

	return nil

}

func (p *PlainPrinter) plainPrintRelationship(r *madon.Relationship, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "ID", "%d", r.ID)

	indentedPrint(w, indent, false, false, "Following", "%v", r.Following)

	indentedPrint(w, indent, false, false, "Followed-by", "%v", r.FollowedBy)

	indentedPrint(w, indent, false, false, "Blocking", "%v", r.Blocking)

	indentedPrint(w, indent, false, false, "Muting", "%v", r.Muting)

	indentedPrint(w, indent, false, false, "Requested", "%v", r.Requested)

	return nil

}

func (p *PlainPrinter) plainPrintReport(r *madon.Report, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Report ID", "%d", r.ID)

	indentedPrint(w, indent, false, false, "Action taken", "%s", r.ActionTaken)

	return nil

}

func (p *PlainPrinter) plainPrintResults(r *madon.Results, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Results", "%d account(s), %d status(es), %d hashtag(s)",

		len(r.Accounts), len(r.Statuses), len(r.Hashtags))

	if len(r.Accounts) > 0 {

		indentedPrint(w, indent, false, false, "Accounts", "")

		p.PrintObj(r.Accounts, w, indent+p.Indent)

	}

	if len(r.Statuses) > 0 {

		indentedPrint(w, indent, false, false, "Statuses", "")

		p.PrintObj(r.Statuses, w, indent+p.Indent)

	}

	if len(r.Hashtags) > 0 {

		indentedPrint(w, indent, false, false, "Hashtags", "")

		for _, tag := range r.Hashtags {

			indentedPrint(w, indent+p.Indent, true, false, "Tag", "%s", tag)

		}

	}

	return nil

}

func (p *PlainPrinter) plainPrintStatus(s *madon.Status, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "Status ID", "%d", s.ID)

	indentedPrint(w, indent, false, false, "From", "%s", s.Account.Acct)

	indentedPrint(w, indent, false, false, "Timestamp", "%v", s.CreatedAt.Local())

	if s.Reblog != nil {

		indentedPrint(w, indent, false, false, "Reblogged from", "%s", s.Reblog.Account.Username)

		return p.plainPrintStatus(s.Reblog, w, indent+p.Indent)

	}

	indentedPrint(w, indent, false, false, "Contents", "%s", html2string(s.Content))

	if s.InReplyToID > 0 {

		indentedPrint(w, indent, false, false, "In-Reply-To", "%d", s.InReplyToID)

	}

	if s.Reblogged {

		indentedPrint(w, indent, false, false, "Reblogged", "%v", s.Reblogged)

	}

	indentedPrint(w, indent, false, false, "URL", "%s", s.URL)

	return nil

}

func (p *PlainPrinter) plainPrintUserToken(s *madon.UserToken, w io.Writer, indent string) error {

	indentedPrint(w, indent, true, false, "User token", "%s", s.AccessToken)

	indentedPrint(w, indent, false, true, "Type", "%s", s.TokenType)

	if s.CreatedAt != 0 {

		indentedPrint(w, indent, false, true, "Timestamp", "%v", time.Unix(int64(s.CreatedAt), 0))

	}

	indentedPrint(w, indent, false, true, "Scope", "%s", s.Scope)

	return nil

}