package tui

import (
	"encoding/base64"
	"fmt"
	"log"
	"strings"
	"time"

	"whspbrd/pkg/cell_size"
	"whspbrd/pkg/clean_image"
	"whspbrd/pkg/render_image"

	"github.com/jroimartin/gocui"
)

const (
	chatViewColumn      = 23
	userIconPath        = "./configs/icon.png"
	contactIconPathFmt  = "./configs/servers/default/users/%s/icon.png"
	messageRowOffset    = 2
	messageRowIncrement = 3
)

func updateChatView(v *gocui.View) {
	v.Clear()

	clear := cleanimage.NewKittyImageCleaner()
	fmt.Print(clear.DeleteByColumn(chatViewColumn, false))

	// Reset scroll offset when switching contacts or if out of bounds
	if chatScrollOffset < 0 {
		chatScrollOffset = 0
	}
	if chatScrollOffset > len(chatData.Messages) {
		chatScrollOffset = len(chatData.Messages)
	}

	// Set view origin based on scroll offset
	ox, _ := v.Origin()
	v.SetOrigin(ox, chatScrollOffset)

	// Get view dimensions to check if images are visible
	_, viewHeight := v.Size()

	for i, msg := range chatData.Messages {
		decoded, err := base64.StdEncoding.DecodeString(msg.Content)
		if err != nil {
			log.Printf("Error decoding message: %v", err)
			continue
		}
		decoded = []byte(strings.TrimSuffix(string(decoded), "\n"))

		t, err := time.Parse(time.RFC3339, msg.Timestamp)
		if err != nil {
			log.Printf("Error parsing timestamp: %v", err)
			t = time.Now() // fallback to current time
		}
		formattedTime := t.Format("2006-01-02 15:04")

		w, h, err := cell_size.GetTerminalCellSizePixels()
		if err != nil {
			log.Println("Error getting terminal cell size:", err)
			continue
		}
		if h > w {
			h = h * 2
			w = 0
		} else {
			w = w*3 - (w / 10)
			h = 0
		}

		if len(users) == 0 || selectedUserIdx >= len(users) {
			continue
		}

		// Calculate row position accounting for scroll offset
		// Each message takes 3 lines (messageRowIncrement)
		rowPosition := i*messageRowIncrement + messageRowOffset - chatScrollOffset

		// Only render images that are visible in the view
		if rowPosition >= 0 && rowPosition < viewHeight {
			if !strings.EqualFold(msg.Sender, users[selectedUserIdx]) {
				fmt.Fprintf(v, "%s", "\t\t\t\t\t"+Colors.Text(Colors.Base02)+"You ("+formattedTime+"):"+Colors.Reset+"\n\t\t\t\t\t"+string(decoded)+"\n\n")
				render_image.RenderImage(userIconPath, rowPosition, chatViewColumn, w, h, false)
			} else {
				fmt.Fprintf(v, "%s", "\t\t\t\t\t"+Colors.Text(Colors.Base05)+msg.Sender+" ("+formattedTime+"):"+Colors.Reset+"\n\t\t\t\t\t"+string(decoded)+"\n\n")
				iconPath := fmt.Sprintf(contactIconPathFmt, strings.ToLower(msg.Sender))
				render_image.RenderImage(iconPath, rowPosition, chatViewColumn, w, h, false)
			}
		} else {
			// Still print the text even if image is not visible
			if !strings.EqualFold(msg.Sender, users[selectedUserIdx]) {
				fmt.Fprintf(v, "%s", "\t\t\t\t\t"+Colors.Text(Colors.Base02)+"You ("+formattedTime+"):"+Colors.Reset+"\n\t\t\t\t\t"+string(decoded)+"\n\n")
			} else {
				fmt.Fprintf(v, "%s", "\t\t\t\t\t"+Colors.Text(Colors.Base05)+msg.Sender+" ("+formattedTime+"):"+Colors.Reset+"\n\t\t\t\t\t"+string(decoded)+"\n\n")
			}
		}
	}
}

func sendMessage(g *gocui.Gui, v *gocui.View) error {
	if len(users) == 0 || selectedUserIdx >= len(users) {
		return nil
	}

	input := v.Buffer()
	v.Clear()
	v.SetCursor(0, 0)
	v.SetOrigin(0, 0)

	if err := WriteMessage(users[selectedUserIdx], "You", users[selectedUserIdx], input); err != nil {
		log.Printf("Error writing message: %v", err)
		return err
	}
	LoadMessages(users[selectedUserIdx])

	chatView, err := g.View("chat")
	if err != nil {
		log.Printf("Error getting chat view: %v", err)
		return err
	}

	// Reset scroll to bottom when sending a new message
	chatScrollOffset = 0
	updateChatView(chatView)
	return nil
}

func scrollChatUp(g *gocui.Gui, v *gocui.View) error {
	chatView, err := g.View("chat")
	if err != nil {
		return err
	}

	// Scroll up by 1 line
	if chatScrollOffset > 0 {
		chatScrollOffset--
		updateChatView(chatView)
	}
	return nil
}

func scrollChatDown(g *gocui.Gui, v *gocui.View) error {
	chatView, err := g.View("chat")
	if err != nil {
		return err
	}

	// Scroll down by 1 line
	maxScroll := len(chatData.Messages) * messageRowIncrement
	if chatScrollOffset < maxScroll {
		chatScrollOffset++
		updateChatView(chatView)
	}
	return nil
}