from __future__ import annotations

import re
from enum import StrEnum
from typing import Any

E164_MIN_LENGTH = 5
E164_MAX_LENGTH = 15
E164_PATTERN = re.compile(r"^\+\d{%d,%d}$" % (E164_MIN_LENGTH, E164_MAX_LENGTH))


class SetupStep(StrEnum):
    STATUS = "status"
    PREPARE = "prepare"
    CLI_PATH = "cli_path"
    SIGNAL_NUMBER = "signal_number"
    ALLOW_FROM = "allow_from"
    COMPLETION = "completion"


class SetupWizard:
    def __init__(self, config: dict[str, Any] | None = None):
        self.config = config or {}
        self._current_step: SetupStep = SetupStep.STATUS

    @property
    def current_step(self) -> str:
        return self._current_step.value

    def get_step_result(self) -> dict:
        match self._current_step:
            case SetupStep.STATUS:
                return self._status_step()
            case SetupStep.PREPARE:
                return self._prepare_step()
            case SetupStep.CLI_PATH:
                return self._cli_path_step()
            case SetupStep.SIGNAL_NUMBER:
                return self._signal_number_step()
            case SetupStep.ALLOW_FROM:
                return self._allow_from_step()
            case SetupStep.COMPLETION:
                return self._completion_step()
            case _:
                return {"step": self._current_step.value, "status": "unknown"}

    def advance(self, data: dict[str, Any] | None = None) -> dict:
        step_order = list(SetupStep)
        current_idx = step_order.index(self._current_step)
        if current_idx < len(step_order) - 1:
            self._current_step = step_order[current_idx + 1]
        return self.get_step_result()

    def _status_step(self) -> dict:
        return {
            "step": "status",
            "title": "Signal Setup Wizard",
            "description": "Configure your Signal channel step by step",
            "total_steps": len(SetupStep),
        }

    def _prepare_step(self) -> dict:
        from yuxi.channels.adapters.signal.install import check_java_installed, check_signal_cli_installed

        java_ok, _ = check_java_installed()
        cli_ok, cli_version = check_signal_cli_installed(self.config.get("cli_path", "signal-cli"))

        result = {
            "step": "prepare",
            "title": "Environment Check",
            "fields": [
                {"key": "java_installed", "label": "Java 17+", "ok": java_ok},
                {"key": "signal_cli_installed", "label": "signal-cli", "ok": cli_ok, "version": cli_version or ""},
            ],
            "ready": java_ok and cli_ok,
        }

        if not cli_ok and java_ok:
            result["can_auto_install"] = True
            result["auto_install_hint"] = "signal-cli can be auto-installed in the next step"

        return result

    def _cli_path_step(self) -> dict:
        current_path = self.config.get("cli_path", "signal-cli")
        return {
            "step": "cli_path",
            "title": "signal-cli Path",
            "description": "Path to the signal-cli binary",
            "fields": [
                {
                    "key": "cli_path",
                    "label": "Binary Path",
                    "type": "string",
                    "default": current_path,
                    "required": True,
                }
            ],
        }

    def _signal_number_step(self) -> dict:
        current_number = self.config.get("signal_number", "")
        return {
            "step": "signal_number",
            "title": "Signal Phone Number",
            "description": "E.164 format phone number (e.g. +1234567890)",
            "fields": [
                {
                    "key": "signal_number",
                    "label": "Phone Number",
                    "type": "string",
                    "default": current_number,
                    "required": True,
                    "pattern": f"^\\+\\d{{{E164_MIN_LENGTH},{E164_MAX_LENGTH}}}$",
                }
            ],
        }

    def _completion_step(self) -> dict:
        return {
            "step": "completion",
            "title": "Setup Complete",
            "description": "Signal channel is ready to connect",
            "next_steps": [
                "1. Register your number: signal-cli -a <number> register",
                "2. Verify: signal-cli -a <number> verify <CODE>",
                "3. Add an account_uuid config for loop prevention",
            ],
        }

    def _allow_from_step(self) -> dict:
        security = self.config.get("security", {})
        current_allow_from = security.get("allow_from", [])
        return {
            "step": "allow_from",
            "title": "Access Control - Allow From",
            "description": "Comma-separated E.164 numbers, UUIDs, or '*' to allow DM from (leave empty for pairing mode)",
            "fields": [
                {
                    "key": "allow_from",
                    "label": "Allowed Senders",
                    "type": "string",
                    "default": ", ".join(current_allow_from) if current_allow_from else "",
                    "placeholder": "+8613800138000, uuid:abc123, *",
                }
            ],
        }

    def auto_install(self) -> dict:
        import asyncio
        from yuxi.channels.adapters.signal.install import auto_install_signal_cli

        try:
            target_dir = self.config.get("install_dir")
            success = asyncio.run(auto_install_signal_cli(target_dir))
            return {
                "step": "prepare",
                "auto_install_success": success,
                "message": "signal-cli installed successfully" if success else "auto-install failed",
            }
        except Exception as e:
            return {
                "step": "prepare",
                "auto_install_success": False,
                "message": str(e),
            }


def validate_e164(number: str) -> bool:
    return bool(E164_PATTERN.match(number.strip()))


def format_e164(raw: str) -> str:
    stripped = raw.strip()
    if E164_PATTERN.match(stripped):
        return stripped
    digits = re.sub(r"[^\d]", "", stripped)
    if E164_MIN_LENGTH <= len(digits) <= E164_MAX_LENGTH:
        return f"+{digits}"
    raise ValueError(f"Invalid E.164 number: {raw}")