"""SaraSortd's service: status, start/stop/restart, start on login, its
version, and its logs (its own log files, and the systemd journal or, where
SaraSuite runs it, its service log; see Service.py)."""

import asyncio
from pathlib import Path

import flet as ft
import tomlkit

from Core import ChipButton, ChipButtonStyle, DataHome, Heading, IsWindows, Note, Palette, RunBySaraSuite
from Service import Control, Journal, LogFiles, ReadTail, Status
from Widgets import App

ReceiptPath = DataHome / "SaraSuite" / "Receipts" / "SaraSortd.toml"


def LineColor(Line: str) -> str:
    Lower = Line.lower()
    if "error" in Lower or "traceback" in Lower or "failed" in Lower:
        return Palette.Red
    if "sorted" in Lower:
        return Palette.Green
    if "started" in Lower or "stopped" in Lower:
        return Palette.Mauve
    if "checking" in Lower:
        return Palette.Overlay0
    return Palette.Text


class ServicePage(ft.Column):
    def __init__(self, TheApp: App):
        super().__init__(expand=True, spacing=0)
        self.App = TheApp
        self.Polling = False
        self.Source = "Files"  # or "Journal"

        self.Dot = ft.Container(width=14, height=14, border_radius=7, bgcolor=Palette.Overlay0)
        self.StateText = ft.Text("", size=16)
        self.Details = ft.Column(spacing=2)
        self.VersionInfo = ft.Column(spacing=2)
        self.Autostart = ft.Switch(label="Start SaraSortd on login", on_change=self._ToggleAutostart)
        self.StartButton = ChipButton("Start", lambda e: self._Do("start"), ft.Icons.PLAY_ARROW)
        self.StopButton = ChipButton("Stop", lambda e: self._Do("stop"), ft.Icons.STOP, Accent=Palette.Red)
        self.RestartButton = ChipButton("Restart", lambda e: self._Do("restart"), ft.Icons.RESTART_ALT)

        self.FilesButton = ChipButton("Log files", lambda e: self._SetSource("Files"))
        self.JournalButton = ChipButton("Service log" if RunBySaraSuite else "Journal", lambda e: self._SetSource("Journal"))
        self.FilePicker = ft.Dropdown(label="Log file", dense=True, width=260, on_select=lambda e: self._LoadLog())
        self.HideChecking = ft.Checkbox(label="Hide \"Checking\" lines", value=True, on_change=lambda e: self._LoadLog())
        self.Follow = ft.Checkbox(label="Follow", value=True)
        self.LogView = ft.ListView(expand=True, spacing=0, padding=8, auto_scroll=True)

        StatusCard = ft.Container(
            ft.Column([
                ft.Row([self.Dot, self.StateText], spacing=10),
                self.Details,
                ft.Row([self.StartButton, self.StopButton, self.RestartButton], wrap=True),
                self.Autostart,
            ], spacing=10),
            padding=14, bgcolor=Palette.Mantle, border=ft.Border.all(1, Palette.Surface1), border_radius=6, expand=True,
        )
        VersionCard = ft.Container(
            ft.Column([ft.Text("Version", color=Palette.Mauve), self.VersionInfo], spacing=8),
            padding=14, bgcolor=Palette.Mantle, border=ft.Border.all(1, Palette.Surface1), border_radius=6, expand=True,
        )
        self.controls = [
            ft.Container(
                ft.Row([Heading("Service"), ft.Container(expand=True),
                        ChipButton("Reload", lambda e: self.Refresh(), ft.Icons.REFRESH)]),
                padding=ft.Padding.only(left=16, right=16, top=12, bottom=8),
            ),
            ft.Container(ft.Row([StatusCard, VersionCard], vertical_alignment=ft.CrossAxisAlignment.START),
                         padding=ft.Padding.symmetric(horizontal=16)),
            ft.Container(
                ft.Row([self.FilesButton, self.JournalButton, self.FilePicker, ft.Container(width=8),
                        self.HideChecking, self.Follow],
                       vertical_alignment=ft.CrossAxisAlignment.CENTER, scroll=ft.ScrollMode.AUTO),
                padding=ft.Padding.only(left=16, right=16, top=14, bottom=6),
            ),
            ft.Container(self.LogView, expand=True, bgcolor=Palette.Crust, margin=ft.Margin.only(left=16, right=16, bottom=16),
                         border=ft.Border.all(1, Palette.Surface1), border_radius=6),
        ]

    # Status

    def Refresh(self) -> None:
        self._RefreshStatus()
        self._RefreshVersion()
        self._RefreshLogFiles()
        self._LoadLog()
        self._StyleSourceButtons()
        self.update()

    def _RefreshStatus(self) -> None:
        Current = Status(self.App.Config.ServiceName)
        if not Current.Found:
            Color, Text = Palette.Overlay0, f"{self.App.Config.ServiceName} isn't installed"
        elif Current.Running:
            Color, Text = Palette.Green, f"Running ({Current.Sub})"
        elif Current.Active == "failed":
            Color, Text = Palette.Red, "Failed"
        else:
            Color, Text = Palette.Yellow, f"Stopped ({Current.Active})"
        self.Dot.bgcolor = Color
        self.StateText.value = Text
        self.StateText.color = Color
        self.Details.controls = [
            Note(f"{'Service' if RunBySaraSuite else 'Unit'}: {self.App.Config.ServiceName.removesuffix('.service') if RunBySaraSuite else self.App.Config.ServiceName}"),
            Note(f"Since: {Current.Since or '-'}"),
            Note(f"PID: {Current.Pid or '-'}"),
            Note(f"{'Autostart (Startup folder)' if IsWindows else 'Autostart (at login)' if RunBySaraSuite else 'Unit file'}: {Current.Enabled}"),
        ]
        self.StartButton.disabled = Current.Running or not Current.Found
        self.StopButton.disabled = not Current.Running
        self.RestartButton.disabled = not Current.Found
        self.Autostart.value = Current.Enabled == "enabled"
        self.Autostart.disabled = not Current.Found

    def _RefreshVersion(self) -> None:
        TheSetup, Error = self.App.LoadSetup()
        Lines = []
        Daemon = TheSetup.DaemonVersion() if TheSetup else None
        Lines.append(ft.Text(f"SaraSortd {Daemon or '?'}", size=16))
        Lines.append(Note(str(self.App.Config.SortdScriptPath)))
        if TheSetup:
            ConfVersion = str(TheSetup.Data.get("Version", "?"))
            Mismatch = Daemon and ConfVersion.split(".")[0] != Daemon.split(".")[0]
            Lines.append(ft.Text(f"GlobalConf.toml {ConfVersion}" + ("  (major version differs!)" if Mismatch else ""),
                                 color=Palette.Red if Mismatch else Palette.Text, size=13))
        else:
            Lines.append(ft.Text(Error, color=Palette.Red, size=12))
        try:
            Receipt = tomlkit.parse(ReceiptPath.read_text()).unwrap()
            Lines.append(Note(f"Installed by SaraSuite: commit {str(Receipt.get('Commit', '?'))[:10]}"))
            Lines.append(Note(f"Installed {Receipt.get('InstalledAt', '?')}, updated {Receipt.get('UpdatedAt', '?')}"))
        except (OSError, tomlkit.exceptions.TOMLKitError):
            Lines.append(Note("Not installed through SaraSuite (no receipt)."))
        self.VersionInfo.controls = Lines

    def _Do(self, Action: str) -> None:
        Error = Control(self.App.Config.ServiceName, Action)
        if Error:
            self.App.Notify(Error, "error")
        else:
            self.App.Notify(f"SaraSortd: {Action} done.", "success")
        self.Refresh()

    def _ToggleAutostart(self, e) -> None:
        Error = Control(self.App.Config.ServiceName, "enable" if self.Autostart.value else "disable")
        if Error:
            self.App.Notify(Error, "error")
        self._RefreshStatus()
        self.update()

    # Logs

    def _StyleSourceButtons(self) -> None:
        self.FilesButton.style = ChipButtonStyle(Palette.Mauve if self.Source == "Files" else Palette.Surface1)
        self.JournalButton.style = ChipButtonStyle(Palette.Mauve if self.Source == "Journal" else Palette.Surface1)
        self.FilePicker.visible = self.Source == "Files"

    def _SetSource(self, Source: str) -> None:
        self.Source = Source
        self._StyleSourceButtons()
        self._LoadLog()
        self.update()

    def _LogDir(self) -> Path | None:
        TheSetup, _ = self.App.LoadSetup()
        return TheSetup.SpecialDir("LogDir") if TheSetup else None

    def _RefreshLogFiles(self) -> None:
        LogDir = self._LogDir()
        Files = LogFiles(LogDir) if LogDir else []
        Current = self.FilePicker.value
        self.FilePicker.options = [ft.DropdownOption(key=str(FilePath), text=FilePath.name) for FilePath in Files]
        Keys = [str(FilePath) for FilePath in Files]
        if Current not in Keys:
            self.FilePicker.value = Keys[0] if Keys else None

    def _LoadLog(self) -> None:
        Limit = self.App.Config.LogLines
        if self.Source == "Journal":
            Lines = Journal(self.App.Config.ServiceName, Limit)
        elif self.FilePicker.value:
            Lines = ReadTail(Path(self.FilePicker.value), Limit * 4)
        else:
            Lines = ["No log files yet (is Logging = 1 in GlobalConf.toml?)."]
        if self.HideChecking.value:
            Lines = [Line for Line in Lines if "Checking" not in Line]
        Lines = Lines[-Limit:]
        self.LogView.auto_scroll = bool(self.Follow.value)
        self.LogView.controls = [
            ft.Text(Line, size=12, color=LineColor(Line), selectable=True) for Line in Lines
        ]
        if self.page:
            self.LogView.update()

    # Polling while the page is shown

    def StartPolling(self) -> None:
        if self.Polling:
            return
        self.Polling = True
        self.App.Page.run_task(self._Poll)

    def StopPolling(self) -> None:
        self.Polling = False

    async def _Poll(self) -> None:
        while self.Polling:
            await asyncio.sleep(max(1, int(self.App.Config.RefreshSeconds)))
            if not self.Polling:
                break
            try:
                self._RefreshStatus()
                if self.Follow.value:
                    self._RefreshLogFiles()
                    self._LoadLog()
                self.update()
            except Exception:  # the page may be gone mid-update
                pass