"""
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 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 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="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()
    app = LottoSightApp()
    app.protocol("WM_DELETE_WINDOW", app.on_close)
    app.mainloop()


if __name__ == "__main__":
    main()