import Serial_decoder as SD
import tkinter as tk
from tkinter import ttk
from datetime import datetime
import time
from collections import deque

# Matplotlib embedding in Tkinter
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

# === Serial threads (unchanged) ===
tasks = SD.StartInputOutput()  # t1: output_loop (daemon), t2: input_loop (daemon)
FILENAME = f"SaveData/{datetime.today().strftime('%Y_%m_%d_%H_%M')}"

# === Commands window config ===
COMMANDS_FILE = "COMMANDS.txt"  # one command per line


# === Plot history ===
MAX_POINTS = 100  # rolling window length

# Derived channels (what we actually plot):
# 0: Thrust (avg of load cells 1 & 2)
# 1-6: Temp 1..6
# 7-14: Pressure 1..8
DERIVED_CHANNEL_LABELS = [
    "Thrust",        # 0
    "Temp 1",        # 1
    "Temp 2",        # 2
    "Temp 3",        # 3
    "Temp 4",        # 4
    "Temp 5",        # 5
    "Temp 6",        # 6
    "Pressure 1",    # 7
    "Pressure 2",    # 8
    "Pressure 3",    # 9
    "Pressure 4",    # 10
    "Pressure 5",    # 11
    "Pressure 6",    # 12
    "Pressure 7",    # 13
    "Pressure 8",    # 14
]
NUM_DERIVED_CHANNELS = len(DERIVED_CHANNEL_LABELS)  # 15

history_x = deque(maxlen=MAX_POINTS)                         # timestamps
history_y = [deque(maxlen=MAX_POINTS) for _ in range(NUM_DERIVED_CHANNELS)]  # per-channel values

# === GUI setup ===
root = tk.Tk()
root.title("Live 4x4 Grid + Selectable Real-Time Plot")

# Left: 4x4 grid (raw ADC values from 16 channels)
grid_frame = ttk.Frame(root)
grid_frame.grid(row=0, column=0, padx=10, pady=10, sticky="n")

labels = []
for row in range(4):
    for col in range(4):
        idx = row * 4 + col
        lbl = tk.Label(
            grid_frame, name=f"channel{idx}",
            text="0", width=10, height=3,
            borderwidth=2, relief="groove", font=("Arial", 14)
        )
        lbl.grid(row=row, column=col, padx=5, pady=5)
        labels.append(lbl)

# Last / delta tick labels
lbl = tk.Label(root, text="Last Tick:0", width=20, height=3, borderwidth=2, relief="groove", font=("Arial", 14))
lbl.grid(row=4, column=0, columnspan=2)
labels.append(lbl)  # index 16

lbl = tk.Label(root, text="Delta Tick:0", width=20, height=3, borderwidth=2, relief="groove", font=("Arial", 14))
lbl.grid(row=4, column=1, columnspan=2)
labels.append(lbl)  # index 17

# Checkboxes to select plotted (derived) channels
check_frame = ttk.LabelFrame(root, text="Plot Selection")
check_frame.grid(row=1, column=0, padx=10, pady=(0, 10), sticky="nw")

check_vars = []
for i, ch_label in enumerate(DERIVED_CHANNEL_LABELS):
    var = tk.IntVar(value=0)
    chk = ttk.Checkbutton(
        check_frame,
        text=ch_label,
        variable=var,
        command=None  # will assign update_plot after it is defined
    )
    chk.grid(row=i // 4, column=i % 4, sticky="w", padx=4, pady=2)
    check_vars.append(var)

# Right: Matplotlib plot
plot_frame = ttk.Frame(root)
plot_frame.grid(row=0, column=1, rowspan=2, padx=10, pady=10, sticky="n")

fig = Figure(figsize=(6, 4), dpi=100)
ax = fig.add_subplot(111)
ax.set_title("Selected Channels")
ax.set_xlabel("Timestamp")
ax.set_ylabel("Value")
canvas = FigureCanvasTkAgg(fig, master=plot_frame)
canvas.get_tk_widget().pack(fill="both", expand=True)

# Optional controls
controls_frame = ttk.Frame(plot_frame)
controls_frame.pack(fill="x", pady=5)


def clear_selection():
    for v in check_vars:
        v.set(0)
    update_plot()


def clear_history():
    """Clear stored history for all plotted channels."""
    history_x.clear()
    for dq in history_y:
        dq.clear()
    update_plot()  # refresh plot so it shows 'No data' message


ttk.Button(controls_frame, text="Clear Selection", command=clear_selection).pack(side="left")
ttk.Button(controls_frame, text="Clear History", command=clear_history).pack(side="left")


# === Commands window ===

def open_commands_window():
    """
    Create an extra window that shows buttons for each command found in COMMANDS.txt.
    Each button sends the corresponding command string via SD.SendCommand.
    """
    cmd_win = tk.Toplevel(root)
    cmd_win.title("Command Buttons")

    outer = ttk.Frame(cmd_win, padding=10)
    outer.pack(fill="both", expand=True)

    # Scrollable area in case there are many commands
    canvas_widget = tk.Canvas(outer, borderwidth=0)
    scrollbar = ttk.Scrollbar(outer, orient="vertical", command=canvas_widget.yview)
    cmds_frame = ttk.Frame(canvas_widget)

    cmds_frame.bind(
        "<Configure>",
        lambda e: canvas_widget.configure(scrollregion=canvas_widget.bbox("all"))
    )

    canvas_widget.create_window((0, 0), window=cmds_frame, anchor="nw")
    canvas_widget.configure(yscrollcommand=scrollbar.set)

    canvas_widget.pack(side="left", fill="both", expand=True)
    scrollbar.pack(side="right", fill="y")

    # Load commands from file
    try:
        with open(COMMANDS_FILE, "r") as f:
            commands = [
                line.strip()
                for line in f
                if line.strip() and not line.lstrip().startswith("#")
            ]
    except OSError as e:
        ttk.Label(
            cmds_frame,
            text=f"Could not read {COMMANDS_FILE}:\n{e}",
            foreground="red",
            justify="left"
        ).pack(anchor="w")
        return

    if not commands:
        ttk.Label(
            cmds_frame,
            text=f"No commands found in {COMMANDS_FILE}.",
            foreground="red"
        ).pack(anchor="w")
        return
    s = ttk.Style()
    s.configure('TButton', font=('Arial', 14))
    # Create a button per command
    for i , cmd in enumerate(commands):
        def make_callback(c=cmd):
            def _cb():
                # Ensure it ends with newline/carriage return similar to console input
                to_send = c
                if not to_send.endswith("\n") and not to_send.endswith("\r"):
                    to_send = to_send + "\n\r"
                SD.SendCommand(to_send)
            return _cb

        row = i // 2
        col = i % 2

        btn = ttk.Button(cmds_frame, text=cmd, command=make_callback(),style='TButton')
        btn.grid(row=row, column=col, padx=5, pady=5, sticky="ew")
    
    cmds_frame.columnconfigure(0, weight=1)
    cmds_frame.columnconfigure(1, weight=1)

# Add a button in the main UI to reopen the commands window if needed
ttk.Button(controls_frame, text="Open Commands", command=open_commands_window).pack(side="left", padx=(10, 0))


# === Update functions ===
Last_tick: int = 0


def update_grid(values: list, tick: int):
    """Update the 4x4 grid with raw ADC values and write ADC csv."""
    global Last_tick
    # NOTE: mode should be "a" or "a+", not "+a"
    with open(f"{FILENAME}_ADC.csv", "a") as file:
        file.write(f"{tick}")
        for i in range(16):  # 16 raw ADC channels
            file.write(f",{values[i]}")
            labels[i].config(text=f"{values[i]:n}")
            ms_total = tick
            hours, rem = divmod(ms_total, 3_600_000)   # 1000*60*60
            minutes, rem = divmod(rem, 60_000)         # 1000*60
            seconds, milliseconds = divmod(rem, 1000)
            labels[16].config(text=f"UP Time:{hours:02d}:{minutes:02d}:{seconds:02d}.{milliseconds:03d}")
            labels[17].config(text=f"Delta Tick:{(tick - Last_tick):n}")
        Last_tick = tick
        file.write("\n")


def update_SI(value: SD.ReturnDecoder):
    # NOTE: mode should be "a" or "a+", not "+a"
    with open(f"{FILENAME}_SI.csv", "a") as file:
        file.write(f"{value.timestamp},{value.log_message}\n")
    print(f"Time:{value.timestamp}, SI:{value.log_message}", end="\n")


Last_history_call: int = 0


def append_history(adc_values: list, timestamp: int):
    """Store the new sample in the rolling history (derived units)."""
    global Last_history_call
    if len(history_x) > 0 and timestamp < history_x[-1]:
        return  # discard out-of-order samples
    if len(history_x) > 0 and (history_x[-1] + (int(time.time_ns() / 1000000) - Last_history_call) * 2) < timestamp:
        print(f"Discarding future sample: {timestamp} > {history_x[-1]} + "
              f"{(int(time.time_ns() / 1000000) - Last_history_call) * 2}")
        return  # discard samples too far in future
    history_x.append(timestamp)
    Last_history_call = int(time.time_ns() / 1000000)  # in ms

    # 0: Thrust (average of load cells 0 and 1)
    lc_avg = (adc_values[0] + adc_values[1]) / 2
    weight = -1.166759308000000e-04 * lc_avg + 4.971416323340051e+02
    history_y[0].append(weight)

    # 1-6: Temperatures from channels 2..7
    for i in range(2, 8):  # six thermocouples
        temp = 0.000111 * adc_values[i] + 2.31991
        history_y[i - 1].append(temp)  # 2→1, 7→6

    # 7-14: Pressures from channels 8..15
    for i in range(8, 16):  # eight pressure sensors
        if i == 12:
            pres = 0.0000153522 * (adc_values[i] / 2) - 6.5652036917
            history_y[i - 1].append(pres)  # 8→7, 15→14
        else:
            pres = 0.0000153522 * adc_values[i] - 6.5652036917
            history_y[i - 1].append(pres)  # 8→7, 15→14


def update_plot():
    """Redraw plot based on selected derived channels and available history."""
    ax.clear()
    ax.set_title("Selected Channels")
    ax.set_xlabel("Timestamp")
    ax.set_ylabel("Value")

    selected = [i for i, var in enumerate(check_vars) if var.get() == 1]
    if len(history_x) == 0 or len(selected) == 0:
        ax.text(
            0.5, 0.5,
            "No data / No channels selected",
            ha="center", va="center",
            transform=ax.transAxes
        )
        canvas.draw()
        return

    x = list(history_x)
    for idx in selected:
        # safety: guard against any mismatch, just in case
        if idx < len(history_y):
            y = list(history_y[idx])
            ax.plot(x, y, label=DERIVED_CHANNEL_LABELS[idx])

    ax.legend(loc="upper left", fontsize=8)
    ax.grid(True, linestyle="--", alpha=0.3)
    canvas.draw()


# Now that update_plot exists, fix the checkbox command to point to it
for child in check_frame.winfo_children():
    if isinstance(child, ttk.Checkbutton):
        child.config(command=update_plot)


def update_panel():
    """Main polling loop that consumes Serial_decoder outputs."""
    values: SD.ReturnDecoder = SD.GetReturn(0.1)  # non-blocking read with timeout
    if values is None:
        root.after(10, update_panel)
        return

    # Stop if input thread died
    if tasks[1].is_alive() is False:
        root.quit()

    match values.name:
        case "ADC_FULLRANK":
            # Update grid + history + plot
            update_grid(values=values.ADC_data, tick=values.timestamp)
            append_history(values.ADC_data, values.timestamp)
            update_plot()  # draw right away; if too heavy, throttle with a timer
        case "SI_DECODER":
            update_SI(values)
        case "PR_DECODER":
            print(f"PRD:{values.text_respons}")
        case _:
            print(f"Error {values.name}")

    # Continue polling
    root.after(10, update_panel)  # 10 ms


# Start polling and GUI loop
update_panel()

# FC commands
SD.SerialPort.write(b"SET_ST_SPEED 100\n\r")

# Open the commands window at startup
open_commands_window()

root.mainloop()