#!/usr/bin/env python3
"""Generate SVG screenshots of every TUI screen for documentation.

Uses Textual's headless run_test() + Pilot API to programmatically navigate
each screen and export SVG renders. Requires no hardware — runs entirely
with DemoDevice synthetic signal data.

Output: ../site/src/assets/tui/*.svg  (8 screenshots)

Usage:
    cd tui && uv run python scripts/generate_screenshots.py
"""

import asyncio
import sys
from pathlib import Path

# Ensure the src layout is importable when running from scripts/
sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "src"))

from skywalker_tui.app import SkyWalkerApp
from skywalker_tui.bridge import USBBridge
from skywalker_tui.demo import DemoDevice

OUTPUT_DIR = Path(__file__).resolve().parent.parent.parent / "site" / "src" / "assets" / "tui"

# Terminal size for screenshots — wide enough for sidebar + content
TERM_SIZE = (120, 36)

# Pause durations for rendering
MOUNT_PAUSE = 1.5       # initial mount + mode screen init
MODE_SWITCH_PAUSE = 0.8  # after F-key press
NOTIFY_PAUSE = 0.6       # for toast notifications
STARWARS_PAUSE = 12.0    # time for offline crawl to reach Star Destroyer frame


def _new_app(**kwargs) -> SkyWalkerApp:
    """Create a fresh app instance with demo device."""
    return SkyWalkerApp(bridge=USBBridge(DemoDevice()), **kwargs)


def _save(svg: str, name: str) -> None:
    path = OUTPUT_DIR / f"{name}.svg"
    path.write_text(svg)
    print(f"  OK  {name}.svg  ({len(svg):,} bytes)")


async def capture_mode_screens() -> None:
    """Capture F1-F5 mode screens."""
    app = _new_app(show_splash=False)

    async with app.run_test(size=TERM_SIZE, headless=True) as pilot:
        await pilot.pause(MOUNT_PAUSE)

        modes = [
            ("f1", "spectrum", "Spectrum"),
            ("f2", "scan", "Scan"),
            ("f3", "monitor", "Monitor"),
            ("f4", "lband", "L-Band"),
            ("f5", "track", "Track"),
        ]

        for key, filename, label in modes:
            await pilot.press(key)
            await pilot.pause(MODE_SWITCH_PAUSE)
            svg = app.export_screenshot(title=f"SkyWalker-1 — {label}")
            _save(svg, filename)


async def capture_dark_mode() -> None:
    """Capture dark-mode toggle with Star Wars notification toast."""
    app = _new_app(show_splash=False)

    async with app.run_test(size=TERM_SIZE, headless=True) as pilot:
        await pilot.pause(MOUNT_PAUSE)

        # Toggle to light then back to dark to trigger "Dark Side" notification
        await pilot.press("d")   # -> light
        await pilot.pause(0.3)
        await pilot.press("d")   # -> dark (shows "Dark Side" toast)
        await pilot.pause(NOTIFY_PAUSE)
        svg = app.export_screenshot(title="SkyWalker-1 — Dark Side")
        _save(svg, "dark-mode")


async def capture_splash() -> None:
    """Capture splash screen — needs show_splash=True and quick capture."""
    app = _new_app(show_splash=True)

    async with app.run_test(size=TERM_SIZE, headless=True) as pilot:
        # Splash auto-dismisses after 5s, capture it quickly
        await pilot.pause(MOUNT_PAUSE)
        svg = app.export_screenshot(title="SkyWalker-1 — Splash")
        _save(svg, "splash")


async def capture_starwars() -> None:
    """Capture Star Wars easter egg — uses offline fallback crawl.

    The offline crawl plays through several frames:
      1. Black pause (2s)
      2. "A long time ago..." (3s)
      3. STAR WARS logo (4s)
      4. Episode info (3s)
      5. Opening crawl (per-line at 0.18s)
      6. Star Destroyer (3.5s)
      7. Credits (stays)

    We wait long enough to capture the Star Destroyer frame.
    """
    app = _new_app(show_splash=False)

    async with app.run_test(size=TERM_SIZE, headless=True) as pilot:
        await pilot.pause(MOUNT_PAUSE)
        await pilot.press("ctrl+w")
        await pilot.pause(STARWARS_PAUSE)
        svg = app.export_screenshot(title="SkyWalker-1 — Star Wars")
        _save(svg, "starwars")


async def main() -> None:
    OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
    print(f"Generating TUI screenshots -> {OUTPUT_DIR}/\n")

    captures = [
        ("Mode screens (F1-F5)", capture_mode_screens),
        ("Dark mode toggle", capture_dark_mode),
        ("Splash screen", capture_splash),
        ("Star Wars easter egg", capture_starwars),
    ]

    failed = []
    for label, fn in captures:
        print(f"── {label} ──")
        try:
            await fn()
        except Exception as e:
            print(f"  FAIL  {e}")
            failed.append(label)
        print()

    count = len(list(OUTPUT_DIR.glob("*.svg")))
    print(f"Done. {count} SVG screenshots generated.")

    if failed:
        print(f"\nFailed: {', '.join(failed)}")
        sys.exit(1)


if __name__ == "__main__":
    asyncio.run(main())