import tkinter as tk
from tkinter import messagebox
from database import connect
from datetime import datetime
import qrcode
from PIL import ImageTk

class KasirPage:
    def __init__(self, parent, controller=None):
        self.parent = parent
        self.frame = tk.Frame(parent)
        self.frame.pack(fill="both", expand=True)

        # =====================
        # JUDUL
        # =====================
        tk.Label(
            self.frame,
            text="KASIR - PEMBAYARAN",
            font=("Arial", 18, "bold")
        ).pack(pady=10)

        tk.Button(
            self.frame,
            text="Logout",
            bg="#f9e79f",
            command=self.logout
        ).pack(pady=5)

        tk.Button(
            self.frame,
            text="Refresh",
            command=self.load_tagihan
        ).pack(pady=3)

        # =====================
        # LIST TAGIHAN
        # =====================
        tk.Label(
            self.frame,
            text="Daftar Tagihan (Status: Disajikan)",
            font=("Arial", 12)
        ).pack(pady=5)

        self.listbox = tk.Listbox(self.frame, width=65, height=10)
        self.listbox.pack(pady=5)

        # =====================
        # METODE PEMBAYARAN
        # =====================
        metode_frame = tk.Frame(self.frame)
        metode_frame.pack(pady=5)

        tk.Label(metode_frame, text="Metode Pembayaran:").pack(side=tk.LEFT)

        self.metode = tk.StringVar(value="Cash")
        tk.OptionMenu(
            metode_frame,
            self.metode,
            "Cash", "QRIS", "E-Wallet"
        ).pack(side=tk.LEFT, padx=5)

        # =====================
        # INPUT CASH
        # =====================
        cash_frame = tk.Frame(self.frame)
        cash_frame.pack(pady=5)

        tk.Label(cash_frame, text="Uang Diterima (Cash):").pack(side=tk.LEFT)

        self.uang_entry = tk.Entry(cash_frame, width=15)
        self.uang_entry.pack(side=tk.LEFT, padx=5)

        # =====================
        # HITUNG KEMBALIAN
        # =====================
        def hitung_kembalian(event=None):
            try:
                # 1. Ambil transaksi yang sedang dipilih (Total tagihan)
                idx = self.listbox.curselection()
                if idx:
                    teks_item = self.listbox.get(idx).split(" ")
                    total = int(teks_item[len(teks_item)-1].replace(",",""))
                    
                uang_diterima = int(self.uang_entry.get())

                # 3. Hitung dan update label
                kembalian = uang_diterima - total
                self.kembalian_label.config(text=f"Rp {kembalian:,.0f}")

            except ValueError:
                # Jika input bukan angka atau kosong, atur kembalian jadi 0
                self.kembalian_label.config(text="Rp 0")
            except IndexError:
                # Jika transaksi tidak dipilih
                self.kembalian_label.config(text="Rp 0")

        self.uang_entry.bind("<KeyRelease>", hitung_kembalian)

        # =====================
        # UANG KEMBALIAN (BARU)
        # =====================
        kembalian_frame = tk.Frame(self.frame)
        kembalian_frame.pack(pady=5)

        tk.Label(kembalian_frame, text="Uang Kembalian:").pack(side=tk.LEFT)

        # ⭐️ Label untuk menampilkan kembalian
        self.kembalian_label = tk.Label(kembalian_frame, text="Rp 0")
        self.kembalian_label.pack(side=tk.LEFT, padx=5)


        # =====================
        # BUTTON BAYAR
        # =====================
        tk.Button(
            self.frame,
            text="Proses Pembayaran",
            bg="#d1e7dd",
            width=25,
            command=self.bayar
        ).pack(pady=10)

        self.transaksi_data = []
        self.load_tagihan()

    # =====================
    # LOAD TAGIHAN
    # =====================
    def load_tagihan(self):
        self.listbox.delete(0, tk.END)
        self.transaksi_data = []

        db = connect()
        cur = db.cursor()
        cur.execute("""
            SELECT id, meja_id, total
            FROM transaksi
            WHERE status='Disajikan'
        """)
        rows = cur.fetchall()
        db.close()

        for row in rows:
            t_id, meja, total = row

            self.listbox.insert(
                tk.END,
                f"Meja {meja} | ID {t_id} | Total Rp {total:,.0f}"
            )

            # 🔽 AMBIL DETAIL MENU
            db = connect()
            cur = db.cursor()
            cur.execute("""
                SELECT menu_nama, jumlah
                FROM detail_transaksi
                WHERE transaksi_id=?
            """, (t_id,))
            items = cur.fetchall()
            db.close()

            for nama, qty in items:
                self.listbox.insert(
                    tk.END,
                    f"   • {nama} x{qty}"
                )

            self.listbox.insert(tk.END, "-" * 50)
            self.transaksi_data.append(row)


    # =====================
    # BAYAR
    # =====================
    def bayar(self):
        idx = self.listbox.curselection()
        if not idx:
            messagebox.showwarning("Pilih", "Pilih tagihan yang akan dibayar!")
            return

        idx = self.listbox.curselection()
        if idx:
            teks_item = self.listbox.get(idx).split(" ")
            total = int(teks_item[len(teks_item)-1].replace(",",""))
            meja = int(teks_item[1])
            t_id = int(teks_item[4])
        metode = self.metode.get()

        if metode == "QRIS":
            self.tampilkan_qr(t_id, meja, total)

        elif metode == "E-Wallet":
            self.konfirmasi_ewallet(t_id, meja, total)

        else:  # CASH
            try:
                uang = int(self.uang_entry.get())
            except:
                messagebox.showwarning("Error", "Masukkan uang cash!")
                return

            if uang < total:
                messagebox.showwarning(
                    "Kurang",
                    f"Uang kurang!\nTotal: Rp {total:,.0f}"
                )
                return

            kembalian = uang - total

            self.selesaikan_pembayaran(
                t_id, meja, total, metode,
                uang, kembalian
            )


    # =====================
    # QRIS (CLOSE WINDOW = LUNAS)
    # =====================
    def tampilkan_qr(self, t_id, meja, total):
        win = tk.Toplevel(self.frame)
        win.title("QRIS Payment")
        win.geometry("320x420")

        tk.Label(
            win,
            text="SCAN QR UNTUK BAYAR",
            font=("Arial", 12, "bold")
        ).pack(pady=10)

        qr_data = f"""
QRIS-DUMMY
Cafe Python
Transaksi: {t_id}
Meja: {meja}
Total: {total}
"""

        qr = qrcode.make(qr_data)
        qr_img = ImageTk.PhotoImage(qr)

        lbl = tk.Label(win, image=qr_img)
        lbl.image = qr_img
        lbl.pack(pady=10)

        tk.Label(
            win,
            text=f"Total: Rp {total:,.0f}",
            font=("Arial", 11)
        ).pack(pady=5)

        def selesai_qris():
            self.selesaikan_pembayaran(t_id, meja, total, "QRIS")
            win.destroy()

        # ❌ WINDOW DITUTUP = TRANSAKSI BERHASIL
        win.protocol("WM_DELETE_WINDOW", selesai_qris)

        tk.Button(
            win,
            text="Konfirmasi Pembayaran",
            bg="#d1e7dd",
            width=25,
            command=selesai_qris
        ).pack(pady=15)

    # =====================
    # E-WALLET
    # =====================
    def konfirmasi_ewallet(self, t_id, meja, total):
        confirm = messagebox.askyesno(
            "E-Wallet Payment",
            f"""
Bayar menggunakan E-Wallet?

Meja  : {meja}
Total : Rp {total:,.0f}

Lanjutkan pembayaran?
"""
        )

        if confirm:
            self.selesaikan_pembayaran(t_id, meja, total, "E-Wallet")

    def selesaikan_pembayaran(self, t_id, meja, total, metode, uang=None, kembalian=None):
        db = connect()
        cur = db.cursor()

        try:
            cur.execute(
                """
                UPDATE transaksi
                SET status='Lunas',
                    tanggal = DATETIME('now')
                WHERE id=?
                """,
                (t_id,)
            )
            db.commit() # ⭐️ PASTIKAN COMMIT DILAKUKAN
            tanggal_sekarang = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    
            sql_query = """
            INSERT INTO transaksi (tanggal, total, meja_id, status, metode)
            VALUES (?, ?, ?, ?, ?)
            """
            
            data_transaksi = (tanggal_sekarang, total, meja, "Lunas", metode)
            cur.execute(sql_query, data_transaksi)
            db.commit()

            # Tambahkan print debug untuk konfirmasi
            print(f"DEBUG: Transaksi ID {t_id} berhasil diupdate menjadi Lunas.")
            
        except Exception as e:
            # Jika ada error database
            print(f"ERROR: Gagal update status transaksi: {e}")
            messagebox.showerror("DB Error", "Gagal memperbarui status transaksi.")
            
        finally:
            db.close()

        struk_tambahan = ""
        if metode == "Cash" and uang is not None and kembalian is not None:
             struk_tambahan = f"""
Uang Diterima: Rp {uang:,.0f}
Kembalian    : Rp {kembalian:,.0f}"""

        messagebox.showinfo(
            "Struk Pembayaran",
            f"""
======= STRUK =======
ID Transaksi : {t_id}
Meja         : {meja}
Total        : Rp {total:,.0f}
Metode       : {metode}{struk_tambahan}
Status       : Lunas
====================
Terima kasih 🙏
"""
        )

        self.load_tagihan()

    def logout(self):
        self.frame.destroy()
        from main import LoginScreen
        LoginScreen(self.parent)