"""
Shared UI helpers for the Prole installer screens.

These routines are intentionally lightweight wrappers around the existing
Tk Canvas used by the installer, to reduce clutter in install.py.
"""
from __future__ import annotations

import tkinter as tk
from tkinter import ttk
import platform


def render_title(app, text: str, y: int = 40):
    """Render a section title on the main background canvas."""
    if getattr(app, 'bg_canvas', None) is None:
        return
    item = app.bg_canvas.create_text(40, y, anchor='nw', text=text, fill='#111', font=('Helvetica Neue', 22, 'bold'))
    app._canvas_items.append(item)


def render_paragraph(app, text: str, y: int, wrap: int = 860):
    """Render a paragraph on the main background canvas."""
    if getattr(app, 'bg_canvas', None) is None:
        return
    item = app.bg_canvas.create_text(40, y, anchor='nw', text=text, fill='#1d1d1f', font=('Helvetica', 12), width=wrap)
    app._canvas_items.append(item)


def canvas_text(app, x: int, y: int, text: str, *, fill: str = '#1d1d1f',
                font: tuple = ('Helvetica', 12), anchor: str = 'nw', width: int | None = None,
                justify: str | None = None) -> int:
    """Create a text item on the app's main canvas and track it.

    Returns the created canvas item id.
    """
    if getattr(app, 'bg_canvas', None) is None:
        return -1
    kwargs = dict(anchor=anchor, text=text, fill=fill, font=font)
    if width is not None:
        kwargs['width'] = width
    if justify is not None:
        kwargs['justify'] = justify
    item = app.bg_canvas.create_text(x, y, **kwargs)
    app._canvas_items.append(item)
    return item


def canvas_oval(app, x1: int, y1: int, x2: int, y2: int, *, fill: str | None = None,
                outline: str | None = None, width: int = 1) -> int:
    """Create an oval on the app's main canvas and track it."""
    if getattr(app, 'bg_canvas', None) is None:
        return -1
    item = app.bg_canvas.create_oval(x1, y1, x2, y2, fill=fill or '', outline=outline or '', width=width)
    app._canvas_items.append(item)
    return item


def canvas_rectangle(app, x1: int, y1: int, x2: int, y2: int, *, outline: str = '#6e6e73',
                     width: int = 1, fill: str | None = None) -> int:
    if getattr(app, 'bg_canvas', None) is None:
        return -1
    item = app.bg_canvas.create_rectangle(x1, y1, x2, y2, outline=outline, width=width, fill=fill or '')
    app._canvas_items.append(item)
    return item


def canvas_line(app, x1: int, y1: int, x2: int, y2: int, *, fill: str = '#1d1d1f', width: int = 2) -> int:
    if getattr(app, 'bg_canvas', None) is None:
        return -1
    item = app.bg_canvas.create_line(x1, y1, x2, y2, fill=fill, width=width)
    app._canvas_items.append(item)
    return item


def render_link(app, x: int, y: int, text: str, *, color: str = '#0a84ff', font: tuple = ('Helvetica', 12, 'underline')) -> int:
    """Render a link-styled text on canvas and return its item id."""
    return canvas_text(app, x, y, text, fill=color, font=font)


def canvas_image(app, x: int, y: int, image, *, anchor: str = 'center') -> int:
    """Create an image on the app's main canvas. Not tracked in _canvas_items by default."""
    if getattr(app, 'bg_canvas', None) is None:
        return -1
    try:
        item = app.bg_canvas.create_image(x, y, anchor=anchor, image=image)
        return item
    except Exception:
        return -1


# Explicit-canvas helpers for non-background canvases
def canvas_delete(app, item_id: int):
    try:
        app.bg_canvas.delete(item_id)
    except Exception:
        pass


def canvas_clear_all(app):
    try:
        app.bg_canvas.delete('all')
    except Exception:
        pass


def canvas_coords(app, item_id: int, *coords):
    try:
        app.bg_canvas.coords(item_id, *coords)
    except Exception:
        pass


def canvas_clear(cnv: tk.Canvas):
    try:
        cnv.delete('all')
    except Exception:
        pass


def canvas_text_on(cnv: tk.Canvas, x: int, y: int, text: str, *, fill: str = '#1d1d1f',
                   font: tuple = ('Helvetica', 12), anchor: str = 'center') -> int:
    return cnv.create_text(x, y, text=text, fill=fill, font=font, anchor=anchor)


def canvas_oval_on(cnv: tk.Canvas, x1: int, y1: int, x2: int, y2: int, *, fill: str | None = None,
                   outline: str | None = None, width: int = 1) -> int:
    return cnv.create_oval(x1, y1, x2, y2, fill=fill or '', outline=outline or '', width=width)


def canvas_line_on(cnv: tk.Canvas, x1: int, y1: int, x2: int, y2: int, *, fill: str = 'white', width: int = 2) -> int:
    return cnv.create_line(x1, y1, x2, y2, fill=fill, width=width)


def create_nav_footer(parent, buttons: list[tuple[int, str]], commands: dict[int, callable] | None = None,
                      style_name: str = 'Nav.TButton') -> dict[int, ttk.Button]:
    """Create a right-aligned navigation footer with uniform button styling.

    Parameters:
      - parent: the container (typically the root installer container)
      - buttons: list of (button_id, title) in the order to display
      - commands: optional mapping of button_id -> callback function
      - style_name: ttk style to apply to all buttons

    Returns: {button_id: ttk.Button}

    Examples:
      create_nav_footer(footer, [(1, 'Next')])
      create_nav_footer(footer, [(1, 'Prev'), (2, 'Next')])
      create_nav_footer(footer, [(1, 'Exit')])
    """
    # Ensure a consistent style for navigation buttons
    try:
        style = ttk.Style()
        # Keep padding modest to allow Aqua to size buttons naturally.
        # Avoid forcing a font so the native Aqua metrics are used.
        style.configure(style_name, padding=(10, 6))
    except Exception:
        pass

    footer = ttk.Frame(parent)
    footer.pack(fill='x', side='bottom')
    # Let the footer naturally size to its contents to avoid clipping text on macOS

    # Flexible spacer to push buttons to the right
    spacer = ttk.Frame(footer)
    spacer.pack(side='left', expand=True, fill='x')

    cmds = commands or {}
    btn_map: dict[int, ttk.Button] = {}
    for btn_id, title in buttons:
        cmd = cmds.get(btn_id)
        b = ttk.Button(footer, text=title, style=style_name, command=cmd)
        # Right-aligned order (pack to the right in the declared order)
        # Small extra right padding on the last (right-most) button
        pad = (0, 20) if title.lower() in ('finish', 'exit', 'done') else (0, 8)
        # Use modest vertical padding; let Aqua compute proper height.
        b.pack(side='right', padx=pad, pady=10)
        btn_map[btn_id] = b

    # Return both the frame and button map if needed later by callers
    btn_map['_footer'] = footer  # type: ignore[index]
    return btn_map


class TerminalConsole(ttk.Frame):
    """A scrollable text widget that mimics a terminal console."""
    def __init__(self, parent, **kwargs):
        super().__init__(parent, **kwargs)
        self.text = tk.Text(self, bg='#1e1e1e', fg='#f0f0f0', font=('Menlo', 11) if 'Darwin' in platform.system() else ('Consolas', 11),
                            padx=10, pady=10, insertbackground='white')
        self.scroll = ttk.Scrollbar(self, orient='vertical', command=self.text.yview)
        self.text.configure(yscrollcommand=self.scroll.set)

        self.scroll.pack(side='right', fill='y')
        self.text.pack(side='left', fill='both', expand=True)

        # Make read-only by default but allow selection and copying
        self.text.configure(state='disabled')

    def write(self, content: str):
        """Append text to the console and scroll to the bottom."""
        self.text.configure(state='normal')
        self.text.insert('end', content)
        self.text.see('end')
        self.text.configure(state='disabled')
        self.update_idletasks()


    def clear(self):
        """Clear all content from the console."""
        self.text.configure(state='normal')
        self.text.delete('1.0', 'end')
        self.text.configure(state='disabled')
        self.update_idletasks()