#    Copyright (C) 2025 James Brotosky, Brandon Wickline
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published
#    by the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.

import logging
import os
from typing import Optional

import dotenv
from textual.app import App, ComposeResult
from textual.containers import Vertical
from textual.message import Message
from textual.reactive import reactive
from textual.screen import Screen
from textual.widgets import (
    Button,
    DirectoryTree,
    Footer,
    Header,
    Static,
    Tab,
    Tabs,
)

from models.agent import Agent
from models.policy import Policy
from services.API import AirlockAPIWrapper
from TUI.Screens.moveagentworkflowscreen import MoveAgentWorkflowScreen
from TUI.Screens.otpactivityscreen import OTPActivitiesScreen
from TUI.Screens.otprevokescreen import OTPRevokeScreen
from TUI.Screens.otpworkflowscreen import OTPWorkflowScreen
from TUI.Screens.policyprepworkflowscreen import PolicyPrepWorkflowScreen
from TUI.Screens.quietagentworkflowscreen import QuietAgentWorkflowScreen
from TUI.Themes.theme_amber_terminal import get_amber_terminal_theme
from TUI.Themes.theme_retro_terminal import get_retro_terminal_theme
from TUI.Themes.themeselector import ThemeSelector
from TUI.Widgets.agentmoveoperations import AgentMoveOperations
from TUI.Widgets.multiagentselector import MultiAgentSelector
from TUI.Widgets.policytreewidget import PolicyTreeWidget
from TUI.Widgets.resultsdisplay import ResultsDisplay
from utils.configmanager import get_user_value, load_env, save_user_config
from utils.setup import get_base_directory
from utils.utils import open_directory

dotenv.load_dotenv()

# ---------------------------------------------------------------------------
# GLOBAL STASH
# ---------------------------------------------------------------------------

_APP_RESTART_REASON = None

logger = logging.getLogger(__name__)


# ---------------------------------------------------------------------------
# helper to persist TEXTUAL_THEME to *user* config and mirror to .env
# ---------------------------------------------------------------------------
def _persist_user_theme(theme_name: str) -> None:
    """
    Store the chosen Textual theme in the user's config using the config manager.
    No need to touch .env - config manager handles everything.
    """
    base_dir = get_base_directory()
    config_dir = base_dir / "config"

    try:
        save_user_config(config_dir, {"TEXTUAL_THEME": theme_name})
        logger.debug("Updated user config with TEXTUAL_THEME=%s", theme_name)
    except Exception as exc:
        logger.error("Failed to save TEXTUAL_THEME: %s", exc)


# ---------------------------------------------------------------------------
# 1) SCREEN
# ---------------------------------------------------------------------------
class MainMenuScreen(Screen):
    api: AirlockAPIWrapper
    current_tab = reactive("")

    BUTTON_DEFS = {
        "agent_actions": [
            (
                "🖥️ - Find, Move, or Generate OTP for Agents",
                "move_agent_workflow_button",
            ),
            ("🎫 - Review and appove OTP Activities", "otp_activities_button"),
            ("🔕 - Find and Move Quiet Hosts to Enforcement", "find_quiet_button"),
        ],
        "policy": [
            ("⚖️ - Prepare Policy For Enforcement", "policy_prep_button"),
            ("🛑 - Revoke OTPs", "otp_revoke_button"),
        ],
    }

    def __init__(self) -> None:
        super().__init__()
        self.extras = get_user_value("EXTRAS", str, "NOTTODAY")
        wd = load_env("WORKING_DIR") or os.getcwd()
        if not os.path.isdir(wd):
            wd = os.getcwd()
        self.working_dir = wd

    def _make_buttons_for(self, tab_id: str) -> Vertical:
        defs = self.BUTTON_DEFS.get(tab_id, [])
        buttons = []
        for label, btn_id in defs:
            btn = Button(label, id=btn_id)
            btn.styles.width = "100%"
            buttons.append(btn)
        return Vertical(*buttons)

    def compose(self) -> ComposeResult:
        yield Header(show_clock=True, icon="⚙")

        tabs = [
            Tab("Tree View", id="p_tree"),
            Tab("Agents", id="agent_actions"),
            Tab("Directory", id="dir"),
            Tab("Settings", id="settings"),
        ]

        if self.extras == "POLICYPREP":
            tabs.insert(2, Tab("Policy Prep", id="policy"))

        yield Tabs(*tabs, id="tabs")
        yield Vertical(id="content")
        yield Footer()

    def on_mount(self) -> None:
        self.switch_tab("agent_actions")

    # focus helpers
    def _get_content_buttons(self) -> list[Button]:
        content = self.query_one("#content", Vertical)
        return list(content.query(Button))

    def _focus_first_button(self) -> None:
        buttons = self._get_content_buttons()
        if buttons:
            buttons[0].focus()

    def _focus_tabs(self) -> None:
        tabs = self.query_one("#tabs", Tabs)
        tabs.focus()

    def _focus_nearby_button(self, direction: int) -> None:
        buttons = self._get_content_buttons()
        if not buttons:
            return

        try:
            current = next(i for i, b in enumerate(buttons) if b.has_focus)
        except StopIteration:
            if direction > 0:
                buttons[0].focus()
            else:
                buttons[-1].focus()
            return

        if direction < 0 and current == 0:
            self._focus_tabs()
            return

        new_index = current + direction
        if 0 <= new_index < len(buttons):
            buttons[new_index].focus()

    def switch_tab(self, tab_id: str) -> None:
        self.current_tab = tab_id
        content = self.query_one("#content", Vertical)
        content.remove_children()

        if tab_id in self.BUTTON_DEFS:
            content.mount(self._make_buttons_for(tab_id))
            self.call_later(self._focus_first_button)
        elif tab_id == "dir":
            content.mount(DirectoryTree(self.working_dir, id="dir_tree"))
        elif tab_id == "p_tree":
            content.mount(PolicyTreeWidget(self.app.policies, self.app.devices))
        elif tab_id == "settings":
            content.mount(ThemeSelector())
        else:
            content.mount(Static(f"Unknown tab: {tab_id}"))

    def on_tabs_tab_activated(self, event: Tabs.TabActivated) -> None:
        self.switch_tab(event.tab.id)

    def on_multi_agent_selector_agents_selected(
        self, message: MultiAgentSelector.AgentsSelected
    ) -> None:
        """Handle selected agents from AgentSelector."""
        global _APP_RESTART_REASON
        selected_agents = message.selected_agents
        logger.info("Selected agents: %s", selected_agents)
        # TODO: Implement actual handling of selected agents
        _APP_RESTART_REASON = ("multi_agent_action", selected_agents)
        self.app.exit()

    def on_theme_selector_theme_selected(
        self, message: ThemeSelector.ThemeSelected
    ) -> None:
        """Handle theme selection from ThemeSelector."""
        global _APP_RESTART_REASON
        _persist_user_theme(message.theme_name)
        _APP_RESTART_REASON = ("restart",)
        self.app.exit()

    def on_agent_move_operations_operation_complete(
        self, message: AgentMoveOperations.OperationComplete
    ) -> None:
        """Handle completion of agent move operation - show results."""
        logger.info(
            "Agent move operation completed: %s, %d successful, %d unsuccessful",
            message.operation,
            len(message.successful),
            len(message.unsuccessful),
        )

        # Format results for display
        successful_text = "\n".join(
            [f"{agent.hostname}" for agent, _ in message.successful]
        )
        unsuccessful_text = "\n".join(
            [f"{agent.hostname}: {error}" for agent, error in message.unsuccessful]
        )

        # Remove the operations widget
        try:
            ops_widget = self.query_one(AgentMoveOperations)
            ops_widget.remove()
        except Exception:
            pass

        # Show results
        self.query_one("#content", Vertical).mount(
            ResultsDisplay(message.operation, successful_text, unsuccessful_text)
        )

    def on_results_display_go_back(self, message: ResultsDisplay.GoBack) -> None:
        """Handle back button from results display."""
        try:
            results_widget = self.query_one(ResultsDisplay)
            results_widget.remove()
        except Exception:
            pass
        # Return to main menu
        self.app.pop_screen()

    def on_directory_tree_file_selected(
        self, event: DirectoryTree.FileSelected
    ) -> None:
        path = event.path
        logger.debug("Directory file selected: %s", path)
        try:
            open_directory(str(path))
        except Exception as exc:
            logger.error("Failed to open %s: %s", path, exc)
            self.app.bell()

    def on_button_pressed(self, event: Button.Pressed) -> None:
        button_id = event.button.id
        logger.debug("Button pressed: %s", button_id)

        match button_id:
            case "move_agent_workflow_button":
                self.app.push_screen(MoveAgentWorkflowScreen(self.app.devices))
                event.stop()

            case "otp_generate_button":
                self.app.push_screen(OTPWorkflowScreen(self.app.devices))
                event.stop()

            case "find_quiet_button":
                self.app.push_screen(
                    QuietAgentWorkflowScreen(self.app.api, self.app.policies)
                )
                event.stop()
                return

            case "otp_activities_button":
                self.app.push_screen(OTPActivitiesScreen())
                event.stop()
                return

            case "otp_revoke_button":
                self.app.push_screen(OTPRevokeScreen())
                event.stop()
                return

            case "policy_prep_button":
                # Use the new TUI workflow screen instead of legacy
                self.app.push_screen(
                    PolicyPrepWorkflowScreen(self.app.api, self.app.policies)
                )
                event.stop()
                return

            case _:
                self.app.bell()
                logger.warning("Unknown button pressed: %s", button_id)
                return


# ---------------------------------------------------------------------------
# 2) APP
# ---------------------------------------------------------------------------
class Loxide(App[Message]):
    api: AirlockAPIWrapper
    working_dir: str
    policies: Optional[list[Policy]]
    devices: Optional[list[Agent]]

    CSS = """
    #logo {
        width: 100%;
        content-align: center middle;
        text-align: center;
    }
    """
    BINDINGS = [
        ("q", "quit", "Quit"),
        ("f", "open_fe", "Launch Explorer"),
        ("r", "refresh", "Refresh"),
    ]

    def __init__(self, api: AirlockAPIWrapper):
        self._textual_theme = get_user_value("TEXTUAL_THEME", str, "textual-dark")
        super().__init__()
        self.api = api
        wd = load_env("WORKING_DIR") or os.getcwd()
        if not os.path.isdir(wd):
            wd = os.getcwd()
        self.working_dir = wd
        # Initial data load
        self.refresh_data()

    def refresh_data(self) -> None:
        """Public method to refresh policies and devices from the API."""
        try:
            self.policies = [
                Policy(**row.to_dict())
                for _, row in self.api.policy_find_all().iterrows()
            ]
            self.devices = [
                Agent(**row.to_dict())
                for _, row in self.api.agent_find_all().iterrows()
            ]
            if self.policies and self.devices:
                for agent in self.devices:
                    agent.enrich_with_policies(self.policies)
                logger.debug(
                    f"Enriched {len(self.devices)} agents with policy information"
                )
        except Exception as exc:
            logger.error("Failed to load policies/devices: %s", exc)
            self.policies = None
            self.devices = None

    def on_mount(self, api: AirlockAPIWrapper) -> None:
        self.register_theme(get_retro_terminal_theme())
        self.register_theme(get_amber_terminal_theme())
        self.theme = self._textual_theme
        self.push_screen(MainMenuScreen())

    def action_refresh(self) -> None:
        self.refresh_data()

    def action_quit(self) -> None:
        global _APP_RESTART_REASON
        _APP_RESTART_REASON = None
        self.exit()

    def action_open_fe(self) -> None:
        """Open the working directory in the OS file manager (footer binding)."""
        path_to_open = self.working_dir or os.getcwd()
        try:
            open_directory(path_to_open)
        except Exception as exc:
            logger.error("Failed to open directory %s: %s", path_to_open, exc)
            self.bell()  # optional feedback


# ---------------------------------------------------------------------------
# 3) PUBLIC ENTRYPOINT
# ---------------------------------------------------------------------------
def run_Loxide(api: AirlockAPIWrapper) -> None:
    global _APP_RESTART_REASON
    base_dir = get_base_directory()
    env_path = base_dir / ".env"
    dotenv.load_dotenv(dotenv_path=env_path, override=True)

    max_attempts = 5
    attempts = 0

    while attempts < max_attempts:
        attempts += 1
        logger.debug("Starting app loop iteration (attempt %d)", attempts)
        _APP_RESTART_REASON = None
        app = Loxide(api)

        try:
            app.run()
        except SystemExit as exc:
            if exc.code != 0:
                logger.debug("Caught SystemExit from Textual: %s", exc)
                raise

        reason = _APP_RESTART_REASON
        logger.debug("After app.run(), _APP_RESTART_REASON = %r", reason)

        if not reason:
            logger.debug("No restart reason, exiting loop")
            break

        if reason[0] == "restart":
            logger.debug("Restarting app loop")
            continue

        if reason[0] == "multi_agent_action":
            logger.info("Multi-agent action with selected agents: %s", reason[1])
            continue

        logger.error("Unknown restart reason: %r", reason)
        break


# ---------------------------------------------------------------------------
# 4) DEV
# ---------------------------------------------------------------------------
if __name__ == "__main__":
    api = AirlockAPIWrapper()
    run_Loxide(api)