# ruff: noqa: T201
# flake8: noqa: T201
"""
LiteLLM Interactive Setup Wizard

Guides users through selecting LLM providers, entering API keys,
and generating a proxy config file — mirroring the Claude Code onboarding UX.
"""

import importlib.metadata
import os
import re
import secrets
import sys
import sysconfig
from pathlib import Path
from typing import Dict, List, Optional, Set

# termios / tty are Unix-only; fall back gracefully on Windows
try:
    import termios
    import tty

    _HAS_RAW_TERMINAL: bool = True
except ImportError:
    termios = None  # type: ignore[assignment]
    tty = None  # type: ignore[assignment]
    _HAS_RAW_TERMINAL = False

from litellm.utils import check_valid_key

# ---------------------------------------------------------------------------
# Provider definitions
# ---------------------------------------------------------------------------
# Each entry describes one provider card shown in the wizard.
# `env_key`      — primary env var name (None = no key needed, e.g. Ollama)
# `test_model`   — model passed to check_valid_key for credential validation
#                  (None = skip validation, e.g. Azure needs a deployment name)
# `models`       — default models written into the generated config
# ---------------------------------------------------------------------------

PROVIDERS: List[Dict] = [
    {
        "id": "openai",
        "name": "OpenAI",
        "description": "GPT-4o, GPT-4o-mini, o3-mini",
        "env_key": "OPENAI_API_KEY",
        "key_hint": "sk-...",
        "test_model": "gpt-4o-mini",
        "models": ["gpt-4o", "gpt-4o-mini"],
    },
    {
        "id": "anthropic",
        "name": "Anthropic",
        "description": "Claude Opus 4.6, Sonnet 4.6, Haiku 4.5",
        "env_key": "ANTHROPIC_API_KEY",
        "key_hint": "sk-ant-...",
        "test_model": "claude-haiku-4-5-20251001",
        "models": ["claude-opus-4-6", "claude-sonnet-4-6", "claude-haiku-4-5-20251001"],
    },
    {
        "id": "gemini",
        "name": "Google Gemini",
        "description": "Gemini 2.0 Flash, Gemini 2.5 Pro",
        "env_key": "GEMINI_API_KEY",
        "key_hint": "AIza...",
        "test_model": "gemini/gemini-2.0-flash",
        "models": ["gemini/gemini-2.0-flash", "gemini/gemini-2.5-pro"],
    },
    {
        "id": "azure",
        "name": "Azure OpenAI",
        "description": "GPT-4o via Azure",
        "env_key": "AZURE_AI_API_KEY",
        "key_hint": "your-azure-key",
        "test_model": None,  # needs deployment name — skip validation
        "models": [],
        "needs_api_base": True,
        "api_base_hint": "https://<resource>.openai.azure.com/",
        "api_version": "2024-07-01-preview",
    },
    {
        "id": "bedrock",
        "name": "AWS Bedrock",
        "description": "Claude 3.5, Llama 3 via AWS",
        "env_key": "AWS_ACCESS_KEY_ID",
        "key_hint": "AKIA...",
        "test_model": None,  # multi-key auth — skip validation
        "models": ["bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0"],
        "extra_keys": ["AWS_SECRET_ACCESS_KEY", "AWS_REGION_NAME"],
        "extra_hints": ["your-secret-key", "us-east-1"],
    },
    {
        "id": "ollama",
        "name": "Ollama",
        "description": "Local models (llama3.2, mistral, etc.)",
        "env_key": None,
        "key_hint": None,
        "test_model": None,  # local — no remote validation
        "models": ["ollama/llama3.2", "ollama/mistral"],
        "api_base": "http://localhost:11434",
    },
]


# ---------------------------------------------------------------------------
# ANSI colour helpers
# ---------------------------------------------------------------------------

_ANSI_RE = re.compile(r"\033\[[^m]*m")

_ORANGE = "\033[38;2;215;119;87m"
_DIM = "\033[2m"
_BOLD = "\033[1m"
_GREEN = "\033[38;2;78;186;101m"
_BLUE = "\033[38;2;177;185;249m"
_GREY = "\033[38;2;153;153;153m"
_RESET = "\033[0m"
_CHECK = "✔"
_CROSS = "✘"

_CURSOR_HIDE = "\033[?25l"
_CURSOR_SHOW = "\033[?25h"
_MOVE_UP = "\033[{}A"


def _supports_color() -> bool:
    return sys.stdout.isatty() and os.environ.get("NO_COLOR") is None


def _c(code: str, text: str) -> str:
    return f"{code}{text}{_RESET}" if _supports_color() else text


def orange(t: str) -> str:
    return _c(_ORANGE, t)


def bold(t: str) -> str:
    return _c(_BOLD, t)


def green(t: str) -> str:
    return _c(_GREEN, t)


def blue(t: str) -> str:
    return _c(_BLUE, t)


def grey(t: str) -> str:
    return _c(_GREY, t)


def dim(t: str) -> str:
    return _c(_DIM, t)


def _divider() -> str:
    """Return a styled divider line (evaluated at call-time, not import-time)."""
    return dim("  " + "╌" * 74)


def _styled_input(prompt: str) -> str:
    """
    Like input() but wraps ANSI sequences in readline ignore markers
    (\\001...\\002) so readline correctly tracks the cursor column.
    In non-TTY contexts, strips ANSI entirely so no escape codes appear.
    """
    if sys.stdout.isatty():
        rl_prompt = _ANSI_RE.sub(lambda m: f"\001{m.group()}\002", prompt)
    else:
        rl_prompt = _ANSI_RE.sub("", prompt)
    return input(rl_prompt).strip()


def _yaml_escape(value: str) -> str:
    """Escape a string for safe embedding in a double-quoted YAML scalar."""
    return (
        value.replace("\\", "\\\\")
        .replace('"', '\\"')
        .replace("\n", "\\n")
        .replace("\r", "\\r")
        .replace("\t", "\\t")
    )


# ---------------------------------------------------------------------------
# Layout constants
# ---------------------------------------------------------------------------

LITELLM_ASCII = r"""
  ██╗     ██╗████████╗███████╗██╗     ██╗     ███╗   ███╗
  ██║     ██║╚══██╔══╝██╔════╝██║     ██║     ████╗ ████║
  ██║     ██║   ██║   █████╗  ██║     ██║     ██╔████╔██║
  ██║     ██║   ██║   ██╔══╝  ██║     ██║     ██║╚██╔╝██║
  ███████╗██║   ██║   ███████╗███████╗███████╗██║ ╚═╝ ██║
  ╚══════╝╚═╝   ╚═╝   ╚══════╝╚══════╝╚══════╝╚═╝     ╚═╝
"""


# ---------------------------------------------------------------------------
# Setup wizard
# ---------------------------------------------------------------------------


class SetupWizard:
    """
    Interactive onboarding wizard: provider selection → API keys → config file.

    All methods are static — the class is purely a namespace with clear
    single-responsibility sections. Entry point: SetupWizard.run().
    """

    # ── entry point ─────────────────────────────────────────────────────────

    @staticmethod
    def run() -> None:
        try:
            SetupWizard._wizard()
        except (KeyboardInterrupt, EOFError):
            print(f"\n\n  {grey('Setup cancelled.')}\n")

    # ── wizard steps ────────────────────────────────────────────────────────

    @staticmethod
    def _wizard() -> None:
        SetupWizard._print_welcome()
        print(f"  {bold('Lets get started.')}")
        print()

        providers = SetupWizard._select_providers()
        env_vars = SetupWizard._collect_keys(providers)
        port, master_key = SetupWizard._proxy_settings()

        config_path = Path(os.getcwd()) / "litellm_config.yaml"
        try:
            config_path.write_text(
                SetupWizard._build_config(providers, env_vars, master_key)
            )
        except OSError as exc:
            print(f"\n  {bold(_CROSS + ' Could not write config:')} {exc}")
            print("  Try running from a directory you have write access to.\n")
            return

        SetupWizard._print_success(config_path, port, master_key)
        SetupWizard._offer_start(config_path, port, master_key)

    # ── welcome ─────────────────────────────────────────────────────────────

    @staticmethod
    def _print_welcome() -> None:
        try:
            version = importlib.metadata.version("litellm")
        except Exception:
            version = "unknown"
        print()
        print(orange(LITELLM_ASCII.rstrip("\n")))
        print(f"  {orange('Welcome')} to {bold('LiteLLM')} {grey('v' + version)}")
        print()
        print(_divider())
        print()

    # ── provider selector ───────────────────────────────────────────────────

    @staticmethod
    def _select_providers() -> List[Dict]:
        """Arrow-key multi-select. Falls back to number input if /dev/tty unavailable."""
        if not _HAS_RAW_TERMINAL:
            return SetupWizard._select_fallback()
        try:
            return SetupWizard._select_interactive()
        except OSError:
            return SetupWizard._select_fallback()

    @staticmethod
    def _read_key() -> str:
        """Read one keypress from /dev/tty in raw mode."""
        assert (
            termios is not None and tty is not None
        )  # only called when _HAS_RAW_TERMINAL
        with open("/dev/tty", "rb") as tty_fh:
            fd = tty_fh.fileno()
            old = termios.tcgetattr(fd)
            try:
                tty.setraw(fd)
                ch = tty_fh.read(1)
                if ch == b"\x1b":
                    ch2 = tty_fh.read(1)
                    if ch2 == b"[":
                        ch3 = tty_fh.read(1)
                        return "\x1b[" + ch3.decode("utf-8", errors="replace")
                    return "\x1b" + ch2.decode("utf-8", errors="replace")
                return ch.decode("utf-8", errors="replace")
            finally:
                termios.tcsetattr(fd, termios.TCSADRAIN, old)

    @staticmethod
    def _render_selector(cursor: int, selected: Set[int], first_render: bool) -> int:
        """Draw or redraw the provider list. Returns the number of lines printed."""
        lines = [
            f"\n  {bold('Add your first model')}\n",
            grey("  ↑↓ to navigate · Space to select · Enter to confirm") + "\n",
            "\n",
        ]
        for i, p in enumerate(PROVIDERS):
            arrow = blue("❯") if i == cursor else " "
            bullet = green("◉") if i in selected else grey("○")
            name_str = bold(p["name"]) if i == cursor else p["name"]
            lines.append(f"  {arrow} {bullet} {name_str}  {grey(p['description'])}\n")
        lines.append("\n")

        content = "".join(lines)
        if not first_render and _supports_color():
            sys.stdout.write(_MOVE_UP.format(content.count("\n")))
        sys.stdout.write(content)
        sys.stdout.flush()
        return content.count("\n")

    @staticmethod
    def _select_interactive() -> List[Dict]:
        cursor = 0
        selected: set[int] = set()

        if _supports_color():
            sys.stdout.write(_CURSOR_HIDE)
            sys.stdout.flush()
        try:
            SetupWizard._render_selector(cursor, selected, first_render=True)
            while True:
                key = SetupWizard._read_key()
                dirty = False
                if key == "\x1b[A":
                    cursor = (cursor - 1) % len(PROVIDERS)
                    dirty = True
                elif key == "\x1b[B":
                    cursor = (cursor + 1) % len(PROVIDERS)
                    dirty = True
                elif key == " ":
                    selected.symmetric_difference_update({cursor})
                    dirty = True
                elif key in ("\r", "\n"):
                    if not selected:
                        selected.add(cursor)
                    break
                elif key in ("\x03", "\x04"):
                    raise KeyboardInterrupt
                if dirty:
                    SetupWizard._render_selector(cursor, selected, first_render=False)
        finally:
            if _supports_color():
                sys.stdout.write(_CURSOR_SHOW)
                sys.stdout.flush()

        return [PROVIDERS[i] for i in sorted(selected)]

    @staticmethod
    def _select_fallback() -> List[Dict]:
        """Number-based fallback when raw terminal input is unavailable."""
        print()
        print(f"  {bold('Add your first model')}")
        print(
            grey(
                "  Enter numbers separated by commas (e.g. 1,2). Press Enter to confirm."
            )
        )
        print()
        for i, p in enumerate(PROVIDERS, 1):
            print(f"  {grey(str(i) + '.')} {bold(p['name'])}  {grey(p['description'])}")
        print()

        while True:
            raw = _styled_input(f"  {blue('❯')} Provider(s): ")
            if not raw:
                print(grey("  Please select at least one provider."))
                continue
            try:
                nums = [
                    int(x.strip())
                    for x in raw.replace(" ", ",").split(",")
                    if x.strip()
                ]
                valid = sorted({n for n in nums if 1 <= n <= len(PROVIDERS)})
                if not valid:
                    print(grey(f"  Enter numbers between 1 and {len(PROVIDERS)}."))
                    continue
                return [PROVIDERS[i - 1] for i in valid]
            except ValueError:
                print(grey("  Enter numbers separated by commas, e.g. 1,3"))

    # ── key collection ───────────────────────────────────────────────────────

    @staticmethod
    def _collect_keys(providers: List[Dict]) -> Dict[str, str]:
        env_vars: Dict[str, str] = {}
        print()
        print(_divider())
        print()
        print(f"  {bold('Enter your API keys')}")
        print(grey("  Keys are stored only in the generated config file."))
        print(
            grey(
                "  Tip: add litellm_config.yaml to .gitignore to avoid committing secrets."
            )
        )
        print()

        for p in providers:
            if p["env_key"] is None:
                print(
                    f"  {green(p['name'])}: {grey('no key needed (uses local Ollama)')}"
                )
                continue

            key = SetupWizard._prompt_key(p)
            if not key:
                continue

            for extra_key, extra_hint in zip(
                p.get("extra_keys", []), p.get("extra_hints", [])
            ):
                val = _styled_input(f"  {blue('❯')} {extra_key} {grey(extra_hint)}: ")
                if val:
                    env_vars[extra_key] = val

            if p.get("needs_api_base"):
                api_base = _styled_input(
                    f"  {blue('❯')} Azure endpoint URL {grey(p.get('api_base_hint', ''))}: "
                )
                if api_base:
                    env_vars[f"_LITELLM_AZURE_AI_API_BASE_{p['id'].upper()}"] = api_base
                deployment = _styled_input(
                    f"  {blue('❯')} Azure deployment name {grey('(e.g. my-gpt4o)')}: "
                )
                if deployment:
                    env_vars[
                        f"_LITELLM_AZURE_DEPLOYMENT_{p['id'].upper()}"
                    ] = deployment

            # Store the key returned by validation — may be a re-entered replacement
            env_vars[p["env_key"]] = SetupWizard._validate_and_report(p, key)

        return env_vars

    @staticmethod
    def _prompt_key(provider: Dict) -> str:
        """Prompt for a provider's API key, with skip option. Returns the key or ''."""
        hint = grey(provider.get("key_hint", ""))
        while True:
            key = _styled_input(
                f"  {blue('❯')} {bold(provider['name'])} API key {hint}: "
            )
            if key:
                return key
            print(grey("  Key is required. Leave blank to skip this provider."))
            if _styled_input(grey("  Skip? (y/N): ")).lower() == "y":
                return ""

    @staticmethod
    def _validate_and_report(provider: Dict, api_key: str) -> str:
        """
        Validate credentials using litellm.utils.check_valid_key and print result.
        Offers a re-entry loop on failure. Returns the final (possibly re-entered) key.
        """
        test_model: Optional[str] = provider.get("test_model")
        if not test_model:
            return api_key  # Azure / Bedrock / Ollama — skip validation

        while True:
            print(
                f"  {grey('Testing connection to ' + provider['name'] + '...')}",
                flush=True,
            )
            valid = check_valid_key(model=test_model, api_key=api_key)
            if valid:
                print(
                    f"  {green(_CHECK)} {bold(provider['name'])} connected successfully"
                )
                return api_key

            print(f"  {_CROSS} {bold(provider['name'])} {grey('— invalid API key')}")
            if (
                _styled_input(f"  {blue('❯')} Re-enter key? {grey('(y/N)')}: ").lower()
                != "y"
            ):
                return api_key

            hint = grey(provider.get("key_hint", ""))
            new_key = _styled_input(
                f"  {blue('❯')} {bold(provider['name'])} API key {hint}: "
            )
            if not new_key:
                return api_key
            api_key = new_key

    # ── proxy settings ───────────────────────────────────────────────────────

    @staticmethod
    def _proxy_settings() -> "tuple[int, str]":
        print()
        print(_divider())
        print()
        print(f"  {bold('Proxy settings')}")
        print()
        port = 4000
        while True:
            port_raw = _styled_input(f"  {blue('❯')} Port {grey('[4000]')}: ")
            if not port_raw:
                break
            if port_raw.isdigit() and 1 <= int(port_raw) <= 65535:
                port = int(port_raw)
                break
            print(grey("  Enter a valid port number (1–65535)."))
        key_raw = _styled_input(f"  {blue('❯')} Master key {grey('[auto-generate]')}: ")
        master_key = key_raw if key_raw else f"sk-{secrets.token_urlsafe(32)}"
        return port, master_key

    # ── config generation ────────────────────────────────────────────────────

    @staticmethod
    def _build_config(
        providers: List[Dict],
        env_vars: Dict[str, str],
        master_key: str,
    ) -> str:
        env_copy = dict(env_vars)  # work on a copy — do not mutate caller's dict
        lines = ["model_list:"]
        for p in providers:
            # Only emit models for providers that actually have credentials
            has_creds = p["env_key"] is None or p["env_key"] in env_copy
            if not has_creds:
                continue

            if p["id"] == "azure":
                deployment = env_copy.pop(
                    f"_LITELLM_AZURE_DEPLOYMENT_{p['id'].upper()}", ""
                )
                if not deployment:
                    continue  # skip Azure entirely if no deployment name was provided
                models = [f"azure/{deployment}"]
            else:
                models = p["models"]

            for model in models:
                raw_display = model.split("/")[-1] if "/" in model else model
                # Qualify azure display names to avoid collision with OpenAI model names
                display = f"azure-{raw_display}" if p["id"] == "azure" else raw_display
                lines += [
                    f"  - model_name: {display}",
                    "    litellm_params:",
                    f"      model: {model}",
                ]
                if p["env_key"] and p["env_key"] in env_copy:
                    lines.append(f"      api_key: os.environ/{p['env_key']}")
                if p.get("api_base"):
                    lines.append(
                        f'      api_base: "{_yaml_escape(str(p["api_base"]))}"'
                    )
                elif p.get("needs_api_base"):
                    azure_base_key = f"_LITELLM_AZURE_AI_API_BASE_{p['id'].upper()}"
                    if azure_base_key in env_copy:
                        lines.append(
                            f'      api_base: "{_yaml_escape(env_copy.pop(azure_base_key))}"'
                        )
                if p.get("api_version"):
                    lines.append(f"      api_version: {p['api_version']}")

        lines += [
            "",
            "general_settings:",
            f'  master_key: "{_yaml_escape(master_key)}"',
            "",
        ]

        real_vars = {k: v for k, v in env_copy.items() if not k.startswith("_LITELLM_")}
        if real_vars:
            lines.append("environment_variables:")
            for k, v in real_vars.items():
                lines.append(f'  {k}: "{_yaml_escape(v)}"')
            lines.append("")

        return "\n".join(lines)

    # ── success + launch ─────────────────────────────────────────────────────

    @staticmethod
    def _print_success(config_path: Path, port: int, master_key: str) -> None:
        print()
        print(_divider())
        print()
        print(f"  {green(_CHECK + ' Config saved')} → {bold(str(config_path))}")
        print()
        print(f"  {bold('To start your proxy:')}")
        print()
        print(f"    {grey('$')} litellm --config {config_path} --port {port}")
        print()
        print(f"  {bold('Then set your client:')}")
        print()
        print(f"    export OPENAI_BASE_URL=http://localhost:{port}")
        print(f"    export OPENAI_API_KEY={master_key}")
        print()
        print(_divider())
        print()

    @staticmethod
    def _offer_start(config_path: Path, port: int, master_key: str) -> None:
        start = _styled_input(
            f"  {blue('❯')} Start the proxy now? {grey('(Y/n)')}: "
        ).lower()
        if start not in ("", "y", "yes"):
            print()
            print(
                f"  Run {bold(f'litellm --config {config_path}')} whenever you're ready."
            )
            print()
            print(
                grey(f"  Quick test once running:  curl http://localhost:{port}/health")
            )
            print()
            return

        print()
        print(_divider())
        print()
        print(f"  {bold('Proxy is starting on')} http://localhost:{port}")
        print()
        print(grey("  Your proxy is OpenAI-compatible. Point any OpenAI SDK at it:"))
        print()
        print(f"    export OPENAI_BASE_URL=http://localhost:{port}")
        print(f"    export OPENAI_API_KEY={master_key}")
        print()
        print(grey("  Quick test (in another terminal):"))
        print()
        print(f"    curl http://localhost:{port}/health")
        print()
        print(grey("  Dashboard:"))
        print()
        print(f"    http://localhost:{port}/ui  {grey('(login with your master key)')}")
        print()
        print(_divider())
        print()
        print(f"  {green(_CHECK)} Starting…  {grey('(Ctrl+C to stop)')}")
        print()

        scripts_dir = sysconfig.get_path("scripts")
        litellm_bin = os.path.join(scripts_dir or "", "litellm")
        try:
            os.execlp(
                litellm_bin,
                litellm_bin,
                "--config",
                str(config_path),
                "--port",
                str(port),
            )  # noqa: S606
        except OSError as exc:
            print(f"\n  {bold(_CROSS + ' Could not start proxy:')} {exc}")
            print(f"  Run manually:  litellm --config {config_path} --port {port}\n")


# ---------------------------------------------------------------------------
# Public entrypoint
# ---------------------------------------------------------------------------


def run_setup_wizard() -> None:
    """Run the interactive setup wizard. Called by `litellm --setup`."""
    SetupWizard.run()