"""Onglet « À propos » : version, build, et activation/état de la licence (G3-C).

Affiche le statut licence et permet l'activation par clef (via
``LicenseClient.activate``) et la vérification (``check``). Aucun appel réseau au
démarrage : seul l'état local est lu. Aucun token n'est journalisé.
Les widgets ne sont créés qu'à l'instanciation (import sûr pour ``--self-test``).
"""

from __future__ import annotations

from typing import Optional

import customtkinter as ctk

from gui_v6 import __version__ as GUI_VERSION
from gui_v6 import theme as theme_mod
from gui_v6.license_client import LicenseClient, LicenseStatus
from gui_v6.machine_id import default_machine_id

_STATUS_LABELS = {
    "active": "Licence active",
    "grace": "Licence en période de grâce",
    "expired": "Licence expirée",
    "revoked": "Poste révoqué",
    "invalid": "Licence invalide",
    "unavailable": "Serveur de licence indisponible",
    "none": "Aucune licence",
}


def _build_info() -> str:
    """Version / commit du build, si disponible. Best-effort, sans casser l'UI."""
    try:
        import build_info  # type: ignore

        commit = getattr(build_info, "BUILD_COMMIT", "?")
        branch = getattr(build_info, "BUILD_BRANCH", "?")
        return f"Build {commit} ({branch})"
    except Exception:
        return "Build : information indisponible"


class AboutTab(ctk.CTkFrame):
    def __init__(
        self,
        master,
        status: Optional[LicenseStatus] = None,
        theme_name: str = theme_mod.DEFAULT_THEME,
        license_client: Optional[LicenseClient] = None,
        **kwargs,
    ) -> None:
        super().__init__(master, **kwargs)
        self._theme_name = theme_name
        self._client = license_client
        self._machine_id = default_machine_id()
        self._status = status or LicenseStatus.none()

        ctk.CTkLabel(
            self,
            text="Pseudonymisation de vos documents",
            font=ctk.CTkFont(size=18, weight="bold"),
        ).pack(anchor="w", padx=16, pady=(16, 4))

        ctk.CTkLabel(self, text=f"Interface V6 — {GUI_VERSION}").pack(anchor="w", padx=16)
        ctk.CTkLabel(self, text=_build_info()).pack(anchor="w", padx=16, pady=(0, 4))
        ctk.CTkLabel(self, text=f"Poste : {self._machine_id}").pack(anchor="w", padx=16, pady=(0, 12))

        self._status_label = ctk.CTkLabel(self, text="", anchor="w", justify="left")
        self._status_label.pack(anchor="w", padx=16, pady=(0, 8))

        # Bloc activation licence
        block = ctk.CTkFrame(self)
        block.pack(fill="x", padx=16, pady=(0, 12))
        ctk.CTkLabel(block, text="Activation par clef :").pack(side="left", padx=(8, 8), pady=8)
        self._key_entry = ctk.CTkEntry(block, width=260, placeholder_text="Clef d'activation")
        self._key_entry.pack(side="left", padx=(0, 8), pady=8)
        self._activate_btn = ctk.CTkButton(block, text="Activer", command=self._activate)
        self._activate_btn.pack(side="left", padx=(0, 8), pady=8)
        self._check_btn = ctk.CTkButton(block, text="Vérifier", command=self._check)
        self._check_btn.pack(side="left", padx=(0, 8), pady=8)

        if self._client is None:
            # Pas de client : activation désactivée, mode dev/bêta.
            self._activate_btn.configure(state="disabled")
            self._check_btn.configure(state="disabled")

        self.set_status(self._status)

    def set_status(self, status: LicenseStatus) -> None:
        self._status = status
        label = _STATUS_LABELS.get(status.status, status.status)
        text = f"État licence : {label}"
        if status.expires_at:
            text += f"  ·  expire le {status.expires_at}"
        if status.message:
            text += f"\n{status.message}"
        color = theme_mod.status_color(self._theme_name, status.status)
        self._status_label.configure(text=text, text_color=color)

    # -- actions licence --------------------------------------------------

    def _activate(self) -> None:
        if self._client is None:
            return
        token = self._key_entry.get().strip()
        if not token:
            return
        status = self._client.activate(token, self._machine_id)
        self.set_status(status)
        # Ne jamais conserver le jeton saisi dans l'UI après usage.
        self._key_entry.delete(0, "end")

    def _check(self) -> None:
        if self._client is None:
            return
        ref = self._status.license_ref
        if not ref:
            self.set_status(LicenseStatus.none("Aucune licence à vérifier"))
            return
        self.set_status(self._client.check(ref, self._machine_id))