"""
main.py
-------
LottoSight entry point.
Creates the main window with toolbar, content area, and status bar.
Wires auto-fetch on launch (background thread) and 24hr APScheduler job.
"""

import logging
import os
import threading
import tkinter as tk
from tkinter import ttk

from apscheduler.schedulers.background import BackgroundScheduler

from db.database import init_db
from core.fetcher import fetch_all
from core.exporter import create_icon_png
from core.paths import bundled_asset, user_data_dir
from ui.statusbar import StatusBar
from ui.history import HistoryScreen
from ui.analysis import AnalysisScreen
from ui.predictor_ui import PredictorScreen
from ui.settings import SettingsScreen

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)s %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
)
logger = logging.getLogger(__name__)


class LottoSightApp(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("LottoSight")
        self.minsize(900, 600)

        try:
            self.iconphoto(True, tk.PhotoImage(file=bundled_asset("assets/icon.png")))
        except Exception:
            pass

        self._fetch_lock = threading.Lock()
        self._scheduler: BackgroundScheduler | None = None
        self._current_screen: tk.Widget | None = None
        self._screens: dict[str, tk.Widget] = {}

        self._build_ui()
        self._start_scheduler()
        self._navigate("History")   # open History as default for now
        self._launch_fetch()        # auto-fetch on startup

    # ── UI construction ───────────────────────────────────────────────────────

    def _build_ui(self):
        # Toolbar
        toolbar = ttk.Frame(self, relief="raised", padding=(8, 4))
        toolbar.pack(side="top", fill="x")

        ttk.Label(
            toolbar, text="LottoSight", font=("TkDefaultFont", 13, "bold")
        ).pack(side="left", padx=(0, 16))

        for name in ("Dashboard", "History", "Analysis", "Predictor", "Settings"):
            ttk.Button(
                toolbar, text=name, width=10,
                command=lambda n=name: self._navigate(n),
            ).pack(side="left", padx=2)

        self._fetch_btn = ttk.Button(
            toolbar, text="Fetch Now", command=self._manual_fetch
        )
        self._fetch_btn.pack(side="right", padx=4)

        # Content area — screens are packed/unpacked inside here
        self._content = ttk.Frame(self)
        self._content.pack(side="top", fill="both", expand=True)

        # Status bar
        self._statusbar = StatusBar(self)
        self._statusbar.pack(side="bottom", fill="x")

    # ── Navigation ────────────────────────────────────────────────────────────

    def _navigate(self, screen_name: str):
        logger.info("Navigate → %s", screen_name)

        if self._current_screen is not None:
            self._current_screen.pack_forget()

        if screen_name not in self._screens:
            self._screens[screen_name] = self._make_screen(screen_name)

        self._current_screen = self._screens[screen_name]
        self._current_screen.pack(fill="both", expand=True)

        # Refresh data-bearing screens each time they're shown
        if hasattr(self._current_screen, "refresh"):
            self._current_screen.refresh()

    def _make_screen(self, name: str) -> tk.Widget:
        if name == "History":
            return HistoryScreen(self._content)
        if name == "Analysis":
            return AnalysisScreen(self._content)
        if name == "Predictor":
            return PredictorScreen(self._content)
        if name == "Settings":
            return SettingsScreen(self._content, on_fetch=self._manual_fetch)
        # Placeholder for screens added in later phases
        placeholder = ttk.Label(
            self._content, text=f"{name} — coming soon",
            font=("TkDefaultFont", 14), anchor="center",
        )
        return placeholder

    # ── Fetch wiring ──────────────────────────────────────────────────────────

    def _start_scheduler(self):
        self._scheduler = BackgroundScheduler()
        self._scheduler.add_job(
            self._launch_fetch, "interval", hours=24, id="auto_fetch_24h"
        )
        self._scheduler.start()
        logger.info("[FETCH] 24hr scheduler started")

    def _launch_fetch(self):
        """Start a background fetch thread (skips if one is already running)."""
        thread = threading.Thread(
            target=self._run_fetch, daemon=True, name="lottosight-fetch"
        )
        thread.start()

    def _manual_fetch(self):
        self._launch_fetch()

    def _run_fetch(self):
        """Worker: fetch all sources, then update UI on the main thread."""
        if not self._fetch_lock.acquire(blocking=False):
            logger.info("[FETCH] Fetch already in progress — skipping")
            return
        try:
            self.after(0, self._on_fetch_start)
            results = fetch_all()
            self.after(0, lambda r=results: self._on_fetch_done(r))
        except Exception as e:
            logger.error("[ERROR] fetch_all raised unexpectedly: %s", e, exc_info=True)
            self.after(0, self._statusbar.set_ready)
        finally:
            self._fetch_lock.release()

    def _on_fetch_start(self):
        self._fetch_btn.config(state="disabled", text="Fetching…")
        self._statusbar.set_fetching()

    def _on_fetch_done(self, results: list):
        self._fetch_btn.config(state="normal", text="Fetch Now")
        self._statusbar.update_fetch_results(results)
        # Refresh the current screen if it can show new data
        if self._current_screen and hasattr(self._current_screen, "refresh"):
            self._current_screen.refresh()

    # ── Lifecycle ─────────────────────────────────────────────────────────────

    def on_close(self):
        if self._scheduler:
            self._scheduler.shutdown(wait=False)
        self.destroy()


def main():
    init_db()
    icon_path = bundled_asset("assets/icon.png")
    if not os.path.exists(icon_path):
        os.makedirs(os.path.dirname(icon_path), exist_ok=True)
        create_icon_png(icon_path)
    app = LottoSightApp()
    app.protocol("WM_DELETE_WINDOW", app.on_close)
    app.mainloop()


if __name__ == "__main__":
    main()