"""Environment configuration manager for OpenRAG TUI."""

import secrets
import string
from dataclasses import dataclass, field
from datetime import datetime
from pathlib import Path
from typing import Dict, List, Optional

from utils.logging_config import get_logger

logger = get_logger(__name__)

from ..utils.validation import (
    sanitize_env_value,
    validate_documents_paths,
    validate_google_oauth_client_id,
    validate_non_empty,
    validate_openai_api_key,
    validate_url,
)


@dataclass
class EnvConfig:
    """Environment configuration data."""

    # Core settings
    openai_api_key: str = ""
    opensearch_password: str = ""
    langflow_secret_key: str = ""
    langflow_superuser: str = "admin"
    langflow_superuser_password: str = ""
    langflow_chat_flow_id: str = "1098eea1-6649-4e1d-aed1-b77249fb8dd0"
    langflow_ingest_flow_id: str = "5488df7c-b93f-4f87-a446-b67028bc0813"
    langflow_url_ingest_flow_id: str = "72c3d17c-2dac-4a73-b48a-6518473d7830"

    # OAuth settings
    google_oauth_client_id: str = ""
    google_oauth_client_secret: str = ""
    microsoft_graph_oauth_client_id: str = ""
    microsoft_graph_oauth_client_secret: str = ""

    # Optional settings
    webhook_base_url: str = ""
    aws_access_key_id: str = ""
    aws_secret_access_key: str = ""
    langflow_public_url: str = ""

    # Langflow auth settings
    langflow_auto_login: str = "False"
    langflow_new_user_is_active: str = "False"
    langflow_enable_superuser_cli: str = "False"
    
    # Ingestion settings
    disable_ingest_with_langflow: str = "False"
    nudges_flow_id: str = "ebc01d31-1976-46ce-a385-b0240327226c"

    # Document paths (comma-separated)
    openrag_documents_paths: str = "./documents"

    # Validation errors
    validation_errors: Dict[str, str] = field(default_factory=dict)


class EnvManager:
    """Manages environment configuration for OpenRAG."""

    def __init__(self, env_file: Optional[Path] = None):
        self.env_file = env_file or Path(".env")
        self.config = EnvConfig()

    def generate_secure_password(self) -> str:
        """Generate a secure password for OpenSearch."""
        # Ensure at least one character from each category
        symbols = "!@#$%^&*"

        # Guarantee at least one of each type
        password_chars = [
            secrets.choice(string.ascii_uppercase),
            secrets.choice(string.ascii_lowercase),
            secrets.choice(string.digits),
            secrets.choice(symbols),
        ]

        # Fill remaining 12 characters with random choices from all categories
        alphabet = string.ascii_letters + string.digits + symbols
        password_chars.extend(secrets.choice(alphabet) for _ in range(12))

        # Shuffle to avoid predictable patterns
        secrets.SystemRandom().shuffle(password_chars)

        return "".join(password_chars)

    def generate_langflow_secret_key(self) -> str:
        """Generate a secure secret key for Langflow."""
        return secrets.token_urlsafe(32)

    def _quote_env_value(self, value: str) -> str:
        """Single quote all environment variable values for consistency."""
        if not value:
            return "''"

        # Escape any existing single quotes by replacing ' with '\''
        escaped_value = value.replace("'", "'\\''")
        return f"'{escaped_value}'"

    def load_existing_env(self) -> bool:
        """Load existing .env file if it exists."""
        if not self.env_file.exists():
            return False

        try:
            with open(self.env_file, "r") as f:
                for line in f:
                    line = line.strip()
                    if not line or line.startswith("#"):
                        continue

                    if "=" in line:
                        key, value = line.split("=", 1)
                        key = key.strip()
                        value = sanitize_env_value(value)

                        # Map env vars to config attributes
                        attr_map = {
                            "OPENAI_API_KEY": "openai_api_key",
                            "OPENSEARCH_PASSWORD": "opensearch_password",
                            "LANGFLOW_SECRET_KEY": "langflow_secret_key",
                            "LANGFLOW_SUPERUSER": "langflow_superuser",
                            "LANGFLOW_SUPERUSER_PASSWORD": "langflow_superuser_password",
                            "LANGFLOW_CHAT_FLOW_ID": "langflow_chat_flow_id",
                            "LANGFLOW_INGEST_FLOW_ID": "langflow_ingest_flow_id",
                            "LANGFLOW_URL_INGEST_FLOW_ID": "langflow_url_ingest_flow_id",
                            "NUDGES_FLOW_ID": "nudges_flow_id",
                            "GOOGLE_OAUTH_CLIENT_ID": "google_oauth_client_id",
                            "GOOGLE_OAUTH_CLIENT_SECRET": "google_oauth_client_secret",
                            "MICROSOFT_GRAPH_OAUTH_CLIENT_ID": "microsoft_graph_oauth_client_id",
                            "MICROSOFT_GRAPH_OAUTH_CLIENT_SECRET": "microsoft_graph_oauth_client_secret",
                            "WEBHOOK_BASE_URL": "webhook_base_url",
                            "AWS_ACCESS_KEY_ID": "aws_access_key_id",
                            "AWS_SECRET_ACCESS_KEY": "aws_secret_access_key",
                            "LANGFLOW_PUBLIC_URL": "langflow_public_url",
                            "OPENRAG_DOCUMENTS_PATHS": "openrag_documents_paths",
                            "LANGFLOW_AUTO_LOGIN": "langflow_auto_login",
                            "LANGFLOW_NEW_USER_IS_ACTIVE": "langflow_new_user_is_active",
                            "LANGFLOW_ENABLE_SUPERUSER_CLI": "langflow_enable_superuser_cli",
                            "DISABLE_INGEST_WITH_LANGFLOW": "disable_ingest_with_langflow",
                        }

                        if key in attr_map:
                            setattr(self.config, attr_map[key], value)

            return True

        except Exception as e:
            logger.error("Error loading .env file", error=str(e))
            return False

    def setup_secure_defaults(self) -> None:
        """Set up secure default values for passwords and keys."""
        if not self.config.opensearch_password:
            self.config.opensearch_password = self.generate_secure_password()

        if not self.config.langflow_secret_key:
            self.config.langflow_secret_key = self.generate_langflow_secret_key()

        # Configure autologin based on whether password is set
        if not self.config.langflow_superuser_password:
            # If no password is set, enable autologin mode
            self.config.langflow_auto_login = "True"
            self.config.langflow_new_user_is_active = "True"
            self.config.langflow_enable_superuser_cli = "True"
        else:
            # If password is set, disable autologin mode
            self.config.langflow_auto_login = "False"
            self.config.langflow_new_user_is_active = "False"
            self.config.langflow_enable_superuser_cli = "False"

    def validate_config(self, mode: str = "full") -> bool:
        """
        Validate the current configuration.

        Args:
            mode: "no_auth" for minimal validation, "full" for complete validation
        """
        self.config.validation_errors.clear()

        # OpenAI API key is now optional (can be provided during onboarding)
        # Only validate format if a key is provided
        if self.config.openai_api_key and not validate_openai_api_key(self.config.openai_api_key):
            self.config.validation_errors["openai_api_key"] = (
                "Invalid OpenAI API key format (should start with sk-)"
            )

        # Validate documents paths only if provided (optional)
        if self.config.openrag_documents_paths:
            is_valid, error_msg, _ = validate_documents_paths(
                self.config.openrag_documents_paths
            )
            if not is_valid:
                self.config.validation_errors["openrag_documents_paths"] = error_msg

        # Validate required fields
        if not validate_non_empty(self.config.opensearch_password):
            self.config.validation_errors["opensearch_password"] = (
                "OpenSearch password is required"
            )

        # Langflow secret key is auto-generated; no user input required

        # Langflow password is now optional - if not provided, autologin mode will be enabled

        if mode == "full":
            # Validate OAuth settings if provided
            if (
                self.config.google_oauth_client_id
                and not validate_google_oauth_client_id(
                    self.config.google_oauth_client_id
                )
            ):
                self.config.validation_errors["google_oauth_client_id"] = (
                    "Invalid Google OAuth client ID format"
                )

            if self.config.google_oauth_client_id and not validate_non_empty(
                self.config.google_oauth_client_secret
            ):
                self.config.validation_errors["google_oauth_client_secret"] = (
                    "Google OAuth client secret required when client ID is provided"
                )

            if self.config.microsoft_graph_oauth_client_id and not validate_non_empty(
                self.config.microsoft_graph_oauth_client_secret
            ):
                self.config.validation_errors["microsoft_graph_oauth_client_secret"] = (
                    "Microsoft Graph client secret required when client ID is provided"
                )

            # Validate optional URLs if provided
            if self.config.webhook_base_url and not validate_url(
                self.config.webhook_base_url
            ):
                self.config.validation_errors["webhook_base_url"] = (
                    "Invalid webhook URL format"
                )

            if self.config.langflow_public_url and not validate_url(
                self.config.langflow_public_url
            ):
                self.config.validation_errors["langflow_public_url"] = (
                    "Invalid Langflow public URL format"
                )

        return len(self.config.validation_errors) == 0

    def save_env_file(self) -> bool:
        """Save current configuration to .env file."""
        try:
            # Ensure secure defaults (including Langflow secret key) are set before saving
            self.setup_secure_defaults()
            # Create timestamped backup if file exists
            if self.env_file.exists():
                timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
                backup_file = self.env_file.with_suffix(f".env.backup.{timestamp}")
                self.env_file.rename(backup_file)

            with open(self.env_file, "w") as f:
                f.write("# OpenRAG Environment Configuration\n")
                f.write("# Generated by OpenRAG TUI\n\n")

                # Core settings
                f.write("# Core settings\n")
                f.write(f"LANGFLOW_SECRET_KEY={self._quote_env_value(self.config.langflow_secret_key)}\n")
                # Only write LANGFLOW_SUPERUSER and password if password is set
                if self.config.langflow_superuser_password:
                    f.write(f"LANGFLOW_SUPERUSER={self._quote_env_value(self.config.langflow_superuser)}\n")
                    f.write(
                        f"LANGFLOW_SUPERUSER_PASSWORD={self._quote_env_value(self.config.langflow_superuser_password)}\n"
                    )
                f.write(f"LANGFLOW_CHAT_FLOW_ID={self._quote_env_value(self.config.langflow_chat_flow_id)}\n")
                f.write(
                    f"LANGFLOW_INGEST_FLOW_ID={self._quote_env_value(self.config.langflow_ingest_flow_id)}\n"
                )
                f.write(f"LANGFLOW_URL_INGEST_FLOW_ID={self._quote_env_value(self.config.langflow_url_ingest_flow_id)}\n")
                f.write(f"NUDGES_FLOW_ID={self._quote_env_value(self.config.nudges_flow_id)}\n")
                f.write(f"OPENSEARCH_PASSWORD={self._quote_env_value(self.config.opensearch_password)}\n")
                # Only write OpenAI API key if provided (can be set during onboarding instead)
                if self.config.openai_api_key:
                    f.write(f"OPENAI_API_KEY={self._quote_env_value(self.config.openai_api_key)}\n")
                f.write(
                    f"OPENRAG_DOCUMENTS_PATHS={self._quote_env_value(self.config.openrag_documents_paths)}\n"
                )
                f.write("\n")

                # Ingestion settings
                f.write("# Ingestion settings\n")
                f.write(f"DISABLE_INGEST_WITH_LANGFLOW={self._quote_env_value(self.config.disable_ingest_with_langflow)}\n")
                f.write("\n")

                # Langflow auth settings
                f.write("# Langflow auth settings\n")
                f.write(f"LANGFLOW_AUTO_LOGIN={self._quote_env_value(self.config.langflow_auto_login)}\n")
                f.write(
                    f"LANGFLOW_NEW_USER_IS_ACTIVE={self._quote_env_value(self.config.langflow_new_user_is_active)}\n"
                )
                f.write(
                    f"LANGFLOW_ENABLE_SUPERUSER_CLI={self._quote_env_value(self.config.langflow_enable_superuser_cli)}\n"
                )
                f.write("\n")

                # OAuth settings
                if (
                    self.config.google_oauth_client_id
                    or self.config.google_oauth_client_secret
                ):
                    f.write("# Google OAuth settings\n")
                    f.write(
                        f"GOOGLE_OAUTH_CLIENT_ID={self._quote_env_value(self.config.google_oauth_client_id)}\n"
                    )
                    f.write(
                        f"GOOGLE_OAUTH_CLIENT_SECRET={self._quote_env_value(self.config.google_oauth_client_secret)}\n"
                    )
                    f.write("\n")

                if (
                    self.config.microsoft_graph_oauth_client_id
                    or self.config.microsoft_graph_oauth_client_secret
                ):
                    f.write("# Microsoft Graph OAuth settings\n")
                    f.write(
                        f"MICROSOFT_GRAPH_OAUTH_CLIENT_ID={self._quote_env_value(self.config.microsoft_graph_oauth_client_id)}\n"
                    )
                    f.write(
                        f"MICROSOFT_GRAPH_OAUTH_CLIENT_SECRET={self._quote_env_value(self.config.microsoft_graph_oauth_client_secret)}\n"
                    )
                    f.write("\n")

                # Optional settings
                optional_vars = [
                    ("WEBHOOK_BASE_URL", self.config.webhook_base_url),
                    ("AWS_ACCESS_KEY_ID", self.config.aws_access_key_id),
                    ("AWS_SECRET_ACCESS_KEY", self.config.aws_secret_access_key),
                    ("LANGFLOW_PUBLIC_URL", self.config.langflow_public_url),
                ]

                optional_written = False
                for var_name, var_value in optional_vars:
                    if var_value:
                        if not optional_written:
                            f.write("# Optional settings\n")
                            optional_written = True
                        f.write(f"{var_name}={self._quote_env_value(var_value)}\n")

                if optional_written:
                    f.write("\n")

            return True

        except Exception as e:
            logger.error("Error saving .env file", error=str(e))
            return False

    def get_no_auth_setup_fields(self) -> List[tuple[str, str, str, bool]]:
        """Get fields required for no-auth setup mode. Returns (field_name, display_name, placeholder, can_generate)."""
        return [
            ("openai_api_key", "OpenAI API Key", "sk-... or leave empty", False),
            (
                "opensearch_password",
                "OpenSearch Password",
                "Will be auto-generated if empty",
                True,
            ),
            (
                "langflow_superuser_password",
                "Langflow Superuser Password",
                "Will be auto-generated if empty",
                True,
            ),
            (
                "openrag_documents_paths",
                "Documents Paths",
                "./documents,/path/to/more/docs",
                False,
            ),
        ]

    def get_full_setup_fields(self) -> List[tuple[str, str, str, bool]]:
        """Get all fields for full setup mode."""
        base_fields = self.get_no_auth_setup_fields()

        oauth_fields = [
            (
                "google_oauth_client_id",
                "Google OAuth Client ID",
                "xxx.apps.googleusercontent.com",
                False,
            ),
            ("google_oauth_client_secret", "Google OAuth Client Secret", "", False),
            ("microsoft_graph_oauth_client_id", "Microsoft Graph Client ID", "", False),
            (
                "microsoft_graph_oauth_client_secret",
                "Microsoft Graph Client Secret",
                "",
                False,
            ),
        ]

        flow_fields = [
            (
                "nudges_flow_id",
                "Nudges Flow ID",
                "ebc01d31-1976-46ce-a385-b0240327226c",
                False,
            ),
        ]

        optional_fields = [
            (
                "disable_ingest_with_langflow",
                "Disable Langflow Ingestion (optional)",
                "False",
                False,
            ),
            (
                "webhook_base_url",
                "Webhook Base URL (optional)",
                "https://your-domain.com",
                False,
            ),
            ("aws_access_key_id", "AWS Access Key ID (optional)", "", False),
            ("aws_secret_access_key", "AWS Secret Access Key (optional)", "", False),
            (
                "langflow_public_url",
                "Langflow Public URL (optional)",
                "http://localhost:7860",
                False,
            ),
        ]

        return base_fields + oauth_fields + flow_fields + optional_fields

    def generate_compose_volume_mounts(self) -> List[str]:
        """Generate Docker Compose volume mount strings from documents paths."""
        is_valid, _, validated_paths = validate_documents_paths(
            self.config.openrag_documents_paths
        )

        if not is_valid:
            return ["./documents:/app/documents:Z"]  # fallback

        volume_mounts = []
        for i, path in enumerate(validated_paths):
            if i == 0:
                # First path maps to the default /app/documents
                volume_mounts.append(f"{path}:/app/documents:Z")
            else:
                # Additional paths map to numbered directories
                volume_mounts.append(f"{path}:/app/documents{i + 1}:Z")

        return volume_mounts