package tui

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"

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

	"github.com/jroimartin/gocui"
)

type ChatMessage struct {
	ID        string `json:"id"`
	Sender    string `json:"sender"`
	Receiver  string `json:"receiver"`
	Content   string `json:"content"`
	Timestamp string `json:"timestamp"`
}

type ChatData struct {
	Messages []ChatMessage `json:"messages"`
}

var messages []string
var users = []string{"Alice\n", "Bob\n", "Charlie\n"}
var prevWidth, prevHeight int

// Load messages from configs/servers/default/users/<username>/messages.json
func loadMessages(username string) {
	chatFile := filepath.Join("configs", "servers", "default", "users", strings.ToLower(username), "messages.json")
	data, err := os.ReadFile(chatFile)
	if err != nil {
		log.Printf("Error reading chat file: %v", err)
		return
	}

	var chatData ChatData
	if err := json.Unmarshal(data, &chatData); err != nil {
		log.Printf("Error parsing JSON: %v", err)
		return
	}

	for _, msg := range chatData.Messages {
		decoded, err := base64.StdEncoding.DecodeString(msg.Content)
		if err != nil {
			log.Printf("Error decoding message: %v", err)
			continue
		}
		// Check if message is ending with a newline and remove it
		if strings.HasSuffix(string(decoded), "\n") {
			decoded = []byte(strings.TrimSuffix(string(decoded), "\n"))
		}

		// Show timestamp in readable format
		t, _ := time.Parse(time.RFC3339, msg.Timestamp)
		formattedTime := t.Format("2006-01-02 15:04")

		if strings.EqualFold(msg.Sender, username) {
			// Sent by "you"
			messages = append(messages, fmt.Sprintf("\t\t\t\tYou (%s):\n\t\t\t\t%s", formattedTime, decoded))
		} else {
			// Sent by other user
			messages = append(messages, fmt.Sprintf("\t\t\t\t%s (%s):\n\t\t\t\t%s", msg.Sender, formattedTime, decoded))
		}
	}
}

func layout(g *gocui.Gui) error {
	maxX, maxY := g.Size()

	if maxX != prevWidth || maxY != prevHeight {
		prevWidth, prevHeight = maxX, maxY
		if chatView, err := g.View("chat"); err == nil {
			updateChatView(chatView)
		}
	}

	if v, err := g.SetView("users", 0, 0, 20, maxY-1); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		v.Title = "Users"
		v.Clear()
		for _, u := range users {
			fmt.Fprintln(v, u)
		}
	}

	if v, err := g.SetView("chat", 21, 0, maxX-1, maxY-5); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		v.Title = "Chat"
		v.Wrap = true
		v.Autoscroll = true
		updateChatView(v)
	}

	if v, err := g.SetView("input", 21, maxY-4, maxX-1, maxY-1); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		v.Title = "Type your message"
		v.Editable = true
		v.Wrap = true
		if _, err := g.SetCurrentView("input"); err != nil {
			return err
		}
	}

	return nil
}

func updateChatView(v *gocui.View) {
	v.Clear()
	for i, msg := range messages {
		fmt.Fprintf(v, "%s\n\n", msg)
		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
		}
		render_image.RenderImage("kogami-rounded.png", i*3+2, 23, w, h, 0)
	}
}

func sendMessage(g *gocui.Gui, v *gocui.View) error {
	input := strings.TrimSpace(v.Buffer())
	v.Clear()
	v.SetCursor(0, 0)
	v.SetOrigin(0, 0)

	if input != "" {
		messages = append(messages, "\t\t\t\tYou:\n\t\t\t\t"+input)
		if chatView, err := g.View("chat"); err == nil {
			updateChatView(chatView)
		}
	}
	return nil
}

func cursorDown(g *gocui.Gui, v *gocui.View) error {
	if v != nil {
		cx, cy := v.Cursor()
		if err := v.SetCursor(cx, cy+1); err != nil {
			ox, oy := v.Origin()
			if err := v.SetOrigin(ox, oy+1); err != nil {
				return err
			}
		}
	}
	return nil
}

func cursorUp(g *gocui.Gui, v *gocui.View) error {
	if v != nil {
		ox, oy := v.Origin()
		cx, cy := v.Cursor()
		if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 {
			if err := v.SetOrigin(ox, oy-1); err != nil {
				return err
			}
		}
	}
	return nil
}

func nextView(g *gocui.Gui, v *gocui.View) error {
	if v == nil || v.Name() == "chat" {
		_, err := g.SetCurrentView("input")
		return err
	}
	_, err := g.SetCurrentView("chat")
	return err
}

func keybindings(g *gocui.Gui) error {
	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		return err
	}
	if err := g.SetKeybinding("chat", gocui.KeyCtrlSpace, gocui.ModNone, nextView); err != nil {
		return err
	}
	if err := g.SetKeybinding("input", gocui.KeyCtrlSpace, gocui.ModNone, nextView); err != nil {
		return err
	}
	if err := g.SetKeybinding("input", gocui.KeyEnter, gocui.ModAlt, insertNewline); err != nil {
		return err
	}
	if err := g.SetKeybinding("input", gocui.KeyEnter, gocui.ModNone, sendMessage); err != nil {
		return err
	}
	if err := g.SetKeybinding("chat", gocui.KeyArrowUp, gocui.ModNone, cursorUp); err != nil {
		return err
	}
	if err := g.SetKeybinding("chat", gocui.KeyArrowDown, gocui.ModNone, cursorDown); err != nil {
		return err
	}
	return nil
}

func insertNewline(g *gocui.Gui, v *gocui.View) error {
	v.EditNewLine()
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

func Run(username string) {
	// Load chat history for the given user
	loadMessages(username)

	g, err := gocui.NewGui(gocui.OutputNormal)
	if err != nil {
		log.Panicln(err)
	}
	defer g.Close()

	g.SetManagerFunc(layout)

	if err := keybindings(g); err != nil {
		log.Panicln(err)
	}

	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
		log.Panicln(err)
	}
}