import asyncio
import json
import sys
import warnings
from importlib.metadata import version
from pathlib import Path
from typing import TYPE_CHECKING, Any

import typer
from dotenv import find_dotenv, load_dotenv

# Load environment variables from .env file for API keys and service URLs.
# Env loading needs to be before config import; usecwd=True searches from cwd, not this .py file's location
load_dotenv(find_dotenv(usecwd=True))

from haiku.rag.config import (  # noqa: E402
    AppConfig,
    find_config_file,
    get_config,
    load_yaml_config,
    set_config,
)
from haiku.rag.logging import configure_cli_logging  # noqa: E402
from haiku.rag.store.exceptions import (  # noqa: E402
    MigrationRequiredError,
    ReadOnlyError,
)
from haiku.rag.store.models.chunk import SearchType  # noqa: E402
from haiku.rag.utils import is_up_to_date  # noqa: E402

if TYPE_CHECKING:
    from haiku.rag.app import HaikuRAGApp

_cli = typer.Typer(
    context_settings={"help_option_names": ["-h", "--help"]},
    no_args_is_help=True,
    pretty_exceptions_show_locals=False,
)


def cli():
    try:
        _cli()
    except (MigrationRequiredError, ReadOnlyError) as e:
        typer.echo(f"Error: {e}", err=True)
        sys.exit(1)


# Module-level flags set by callback
_read_only: bool = False


def create_app(db: Path | None = None) -> "HaikuRAGApp":  # pragma: no cover
    """Create HaikuRAGApp with loaded config and resolved database path.

    Args:
        db: Optional database path. If None, uses path from config.

    Returns:
        HaikuRAGApp instance with proper config and db path.
    """
    from haiku.rag.app import HaikuRAGApp

    config = get_config()
    db_path = db if db else config.storage.data_dir / "haiku.rag.lancedb"
    return HaikuRAGApp(db_path=db_path, config=config, read_only=_read_only)


async def check_version():  # pragma: no cover
    """Check if haiku.rag is up to date and show warning if not."""
    up_to_date, current_version, latest_version = await is_up_to_date()
    if not up_to_date:
        typer.echo(
            f"Warning: haiku.rag is outdated. Current: {current_version}, Latest: {latest_version}",
        )
        typer.echo("Please update.")


def version_callback(value: bool):  # pragma: no cover
    if value:
        v = version("haiku.rag-slim")
        typer.echo(f"haiku.rag version {v}")
        raise typer.Exit()


@_cli.callback()
def main(
    _version: bool = typer.Option(
        False,
        "-v",
        "--version",
        callback=version_callback,
        help="Show version and exit",
    ),
    config: Path | None = typer.Option(
        None,
        "--config",
        help="Path to YAML configuration file",
    ),
    read_only: bool = typer.Option(
        False,
        "--read-only",
        help="Open database in read-only mode",
    ),
):
    """haiku.rag CLI - Vector database RAG system"""
    global _read_only
    _read_only = read_only
    # Load config from --config, local folder, or default directory
    config_path = find_config_file(cli_path=config)
    if config_path:
        yaml_data = load_yaml_config(config_path)
        loaded_config = AppConfig.model_validate(yaml_data)
        set_config(loaded_config)

    # Configure logging for CLI context
    configure_cli_logging()

    from haiku.rag.telemetry import configure as configure_telemetry

    is_production = get_config().environment != "development"
    configure_telemetry(
        service_name="haiku-rag", console=False if is_production else None
    )

    if get_config().environment != "development":
        # Suppress warnings in production
        warnings.filterwarnings("ignore")

    # Run version check before any command
    try:
        asyncio.run(check_version())
    except Exception:  # pragma: no cover
        # Do not block CLI on version check issues
        pass


@_cli.command("list", help="List all stored documents")
def list_documents(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    filter: str | None = typer.Option(
        None,
        "--filter",
        "-f",
        help="SQL WHERE clause to filter documents (e.g., \"uri LIKE '%arxiv%'\")",
    ),
):
    app = create_app(db)
    asyncio.run(app.list_documents(filter=filter))


def _parse_meta_options(meta: list[str] | None) -> dict[str, Any]:
    """Parse repeated --meta KEY=VALUE options into a dictionary.

    Raises a Typer error if any entry is malformed.
    """
    result: dict[str, Any] = {}
    if not meta:
        return result
    for item in meta:
        if "=" not in item:
            raise typer.BadParameter("--meta must be in KEY=VALUE format")
        key, value = item.split("=", 1)
        if not key:
            raise typer.BadParameter("--meta key cannot be empty")
        # Best-effort JSON coercion: numbers, booleans, null, arrays/objects
        try:
            parsed = json.loads(value)
            result[key] = parsed
        except Exception:
            # Leave as string if not valid JSON literal
            result[key] = value
    return result


@_cli.command("add", help="Add a document from text input")
def add_document_text(  # pragma: no cover
    text: str = typer.Argument(
        help="The text content of the document to add",
    ),
    title: str | None = typer.Option(
        None,
        "--title",
        help="Optional title for the document",
    ),
    meta: list[str] | None = typer.Option(
        None,
        "--meta",
        help="Metadata entries as KEY=VALUE (repeatable)",
        metavar="KEY=VALUE",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    metadata = _parse_meta_options(meta)
    asyncio.run(
        app.add_document_from_text(text=text, title=title, metadata=metadata or None)
    )


@_cli.command("add-src", help="Add a document from a file path, directory, or URL")
def add_document_src(  # pragma: no cover
    source: str = typer.Argument(
        help="The file path, directory, or URL of the document(s) to add",
    ),
    title: str | None = typer.Option(
        None,
        "--title",
        help="Optional human-readable title to store with the document",
    ),
    meta: list[str] | None = typer.Option(
        None,
        "--meta",
        help="Metadata entries as KEY=VALUE (repeatable)",
        metavar="KEY=VALUE",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    metadata = _parse_meta_options(meta)
    asyncio.run(
        app.add_document_from_source(
            source=source, title=title, metadata=metadata or None
        )
    )


@_cli.command("get", help="Get and display a document by its ID")
def get_document(  # pragma: no cover
    doc_id: str = typer.Argument(
        help="The ID of the document to get",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.get_document(doc_id=doc_id))


@_cli.command("delete", help="Delete a document by its ID")
def delete_document(  # pragma: no cover
    doc_id: str = typer.Argument(
        help="The ID of the document to delete",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.delete_document(doc_id=doc_id))


# Add alias `rm` for delete
_cli.command("rm", help="Alias for delete: remove a document by its ID")(
    delete_document
)


@_cli.command("search", help="Search for documents by a query")
def search(  # pragma: no cover
    query: str | None = typer.Argument(
        None,
        help="The search query (omit when using --image)",
    ),
    limit: int | None = typer.Option(
        None,
        "--limit",
        "-l",
        help="Maximum number of results to return (default: config search.default_limit)",
    ),
    filter: str | None = typer.Option(
        None,
        "--filter",
        "-f",
        help="SQL WHERE clause to filter documents (e.g., \"uri LIKE '%arxiv%'\")",
    ),
    search_type: SearchType | None = typer.Option(
        None,
        "--search-type",
        "-s",
        help="Type of search to perform (text searches only)",
    ),
    image: Path | None = typer.Option(
        None,
        "--image",
        help="Path to an image file to use as the query (requires a multimodal embedder)",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(
        app.search(
            query=query,
            limit=limit,
            filter=filter,
            search_type=search_type,
            image=image,
        )
    )


@_cli.command("visualize", help="Show visual grounding for a chunk")
def visualize(  # pragma: no cover
    chunk_id: str = typer.Argument(
        help="The ID of the chunk to visualize",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    no_expand: bool = typer.Option(
        False,
        "--no-expand",
        help="Highlight only the chunk itself, without its expanded context",
    ),
):
    app = create_app(db)
    asyncio.run(app.visualize_chunk(chunk_id=chunk_id, expand=not no_expand))


@_cli.command("ask", help="Ask a question using the QA agent")
def ask(  # pragma: no cover
    question: str = typer.Argument(
        help="The question to ask",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    filter: str | None = typer.Option(
        None,
        "--filter",
        "-f",
        help="SQL WHERE clause to filter documents (e.g., \"uri LIKE '%arxiv%'\")",
    ),
    image: list[Path] | None = typer.Option(
        None,
        "--image",
        help="Path to an image to attach to the question (repeatable; requires a vision-capable model)",
    ),
):
    app = create_app(db)
    asyncio.run(
        app.ask(
            question=question,
            filter=filter,
            images=image,
        )
    )


@_cli.command("analyze", help="Answer questions using the analysis capability")
def analyze(  # pragma: no cover
    question: str = typer.Argument(
        help="The question to answer",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    filter: str | None = typer.Option(
        None,
        "--filter",
        "-f",
        help="SQL WHERE clause to filter documents (e.g., \"uri LIKE '%arxiv%'\")",
    ),
    image: list[Path] | None = typer.Option(
        None,
        "--image",
        help="Path to an image to attach to the question (repeatable; requires a vision-capable model)",
    ),
):
    app = create_app(db)
    asyncio.run(
        app.analyze(
            question=question,
            filter=filter,
            images=image,
        )
    )


@_cli.command("settings", help="Display current configuration settings")
def settings():  # pragma: no cover
    from haiku.rag.app import HaikuRAGApp

    config = get_config()
    app = HaikuRAGApp(db_path=Path(), config=config, read_only=True)
    app.show_settings()


@_cli.command("init-config", help="Generate a YAML configuration file")
def init_config(  # pragma: no cover
    output: Path = typer.Argument(
        Path("haiku.rag.yaml"),
        help="Output path for the config file",
    ),
):
    """Generate a YAML configuration file with defaults."""
    import yaml

    from haiku.rag.config.loader import generate_default_config

    if output.exists():
        typer.echo(
            f"Error: {output} already exists. Remove it first or choose a different path."
        )
        raise typer.Exit(1)

    config_data = generate_default_config()

    # Write YAML with comments
    with open(output, "w") as f:
        f.write("# haiku.rag configuration file\n")
        f.write(
            "# See https://ggozad.github.io/haiku.rag/configuration/ for details\n\n"
        )
        yaml.dump(config_data, f, default_flow_style=False, sort_keys=False)

    typer.echo(f"Configuration file created: {output}")
    typer.echo("Edit the file to customize your settings.")


@_cli.command(
    "rebuild",
    help="Rebuild the database by deleting all chunks and re-indexing all documents",
)
def rebuild(
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    embed_only: bool = typer.Option(
        False,
        "--embed-only",
        help="Only regenerate embeddings, keep existing chunks",
    ),
    rechunk: bool = typer.Option(
        False,
        "--rechunk",
        help="Re-chunk from existing content without accessing source files",
    ),
    title_only: bool = typer.Option(
        False,
        "--title-only",
        help="Only generate titles for documents without one",
    ),
    descriptions: bool = typer.Option(
        False,
        "--descriptions",
        help=(
            "Run the VLM over already-stored picture bytes, patch descriptions "
            "into the docling blob, then re-chunk + re-embed. Skips the docling "
            "parse entirely. Requires processing.pictures='description'."
        ),
    ),
    set_embedder: bool = typer.Option(
        False,
        "--set-embedder",
        help=(
            "Adopt the current embedder identity without re-embedding, when the "
            "vector dimension is unchanged. Use after swapping the serving stack "
            "for the same model (e.g. Ollama to vLLM)."
        ),
    ),
):
    from haiku.rag.client import RebuildMode

    exclusive = sum([embed_only, rechunk, title_only, descriptions, set_embedder])
    if exclusive > 1:
        typer.echo(
            "Error: --embed-only, --rechunk, --title-only, --descriptions, and "
            "--set-embedder are mutually exclusive"
        )
        raise typer.Exit(1)

    if embed_only:  # pragma: no cover
        mode = RebuildMode.EMBED_ONLY
    elif rechunk:  # pragma: no cover
        mode = RebuildMode.RECHUNK
    elif title_only:  # pragma: no cover
        mode = RebuildMode.TITLE_ONLY
    elif descriptions:  # pragma: no cover
        mode = RebuildMode.DESCRIPTIONS
    elif set_embedder:  # pragma: no cover
        mode = RebuildMode.SET_EMBEDDER
    else:  # pragma: no cover
        mode = RebuildMode.FULL

    app = create_app(db)  # pragma: no cover
    asyncio.run(app.rebuild(mode=mode))  # pragma: no cover


@_cli.command("vacuum", help="Optimize and clean up all tables to reduce disk usage")
def vacuum(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.vacuum())


@_cli.command("migrate", help="Run pending database migrations")
def migrate(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    try:
        applied = asyncio.run(app.migrate())
        if applied:
            typer.echo(f"Applied {len(applied)} migration(s):")
            for desc in applied:
                typer.echo(f"  - {desc}")
            typer.echo("Migration completed successfully.")
        else:
            typer.echo("No migrations pending. Database is up to date.")
    except Exception as e:
        typer.echo(f"Migration failed: {e}")
        raise typer.Exit(1)


@_cli.command(
    "create-index", help="Create vector index for efficient similarity search"
)
def create_index(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.create_index())


@_cli.command("init", help="Initialize a new database")
def init_db(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.init())


@_cli.command("info", help="Show database info")
def info(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    asyncio.run(app.info())


@_cli.command("doctor", help="Check database and provider health")
def doctor(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    duplicates_out: Path | None = typer.Option(
        None,
        "--duplicates-out",
        help="Write near-duplicate document groups to this YAML file",
    ),
):
    app = create_app(db)
    if asyncio.run(app.doctor(duplicates_out=duplicates_out)):
        raise typer.Exit(code=1)


@_cli.command("history", help="Show version history for database tables")
def history(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    table: str | None = typer.Option(
        None,
        "--table",
        "-t",
        help="Specific table to show history for (documents, document_meta, chunks, document_items, settings)",
    ),
    limit: int | None = typer.Option(
        None,
        "--limit",
        "-l",
        help="Maximum number of versions to show per table",
    ),
):
    app = create_app(db)
    asyncio.run(app.history(table=table, limit=limit))


tag_cli = typer.Typer(
    help="Manage database tags (named versions across all tables)",
    no_args_is_help=True,
)
_cli.add_typer(tag_cli, name="tag")


@tag_cli.command("create", help="Tag the current database state")
def tag_create(  # pragma: no cover
    name: str = typer.Argument(help="Name of the tag to create"),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    try:
        asyncio.run(app.create_tag(name))
    except (ValueError, RuntimeError) as e:
        typer.echo(f"Error: {e}", err=True)
        raise typer.Exit(1)


@tag_cli.command("list", help="List database tags")
def tag_list(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    try:
        asyncio.run(app.list_tags())
    except (ValueError, RuntimeError) as e:
        typer.echo(f"Error: {e}", err=True)
        raise typer.Exit(1)


@tag_cli.command("delete", help="Delete a tag")
def tag_delete(  # pragma: no cover
    name: str = typer.Argument(help="Name of the tag to delete"),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    try:
        asyncio.run(app.delete_tag(name))
    except (ValueError, RuntimeError) as e:
        typer.echo(f"Error: {e}", err=True)
        raise typer.Exit(1)


@tag_cli.command("restore", help="Restore the database to a tagged state")
def tag_restore(  # pragma: no cover
    name: str = typer.Argument(help="Name of the tag to restore"),
    yes: bool = typer.Option(
        False,
        "--yes",
        help="Skip the confirmation prompt. Provides no locking or "
        "concurrent-writer protection.",
    ),
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    app = create_app(db)
    if app._is_local and not app.db_path.exists():
        typer.echo(f"Error: Database path does not exist: {app.db_path}", err=True)
        raise typer.Exit(1)
    if not yes:
        typer.echo(f"Database: {app.db_path}")
        typer.echo(f"Tag: {name}")
        typer.echo("This changes the live database state across all tables.")
        typer.echo("Stop all ingestion and other writers before continuing.")
        typer.echo("The operation is coordinated but not transactionally atomic.")
        typer.echo("A safety tag will preserve the current state.")
        if not typer.confirm("Continue?", default=False):
            raise typer.Exit(1)
    try:
        asyncio.run(app.restore_tag(name))
    except (ValueError, RuntimeError) as e:
        typer.echo(f"Error: {e}", err=True)
        raise typer.Exit(1)


@_cli.command("download-models", help="Download Docling and Ollama models per config")
def download_models_cmd():  # pragma: no cover
    from haiku.rag.app import HaikuRAGApp

    app = HaikuRAGApp(db_path=Path(), config=get_config(), read_only=True)
    try:
        asyncio.run(app.download_models())
    except Exception as e:
        typer.echo(f"Error downloading models: {e}")
        raise typer.Exit(1)


@_cli.command("inspect", help="Launch interactive TUI to inspect database contents")
def inspect(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
):
    """Launch the inspector TUI for browsing documents and chunks."""
    try:
        from haiku.rag.inspector import run_inspector
    except ImportError as e:
        typer.echo(f"Error: {e}", err=True)
        raise typer.Exit(1) from e

    db_path = db if db else get_config().storage.data_dir / "haiku.rag.lancedb"
    run_inspector(db_path, read_only=True)


@_cli.command("chat", help="Launch interactive chat TUI for conversational RAG")
def chat(  # pragma: no cover
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    model: str | None = typer.Option(
        None,
        "--model",
        help="Model to use for the chat (e.g. openai-chat:gpt-4o)",
    ),
    capability: list[str] | None = typer.Option(
        None,
        "--capability",
        "-c",
        help="Capabilities to enable: rag, analysis (can repeat, default: rag)",
    ),
):
    """Launch the chat TUI for conversational RAG."""
    from haiku.rag.chat import run_chat

    db_path = db if db else get_config().storage.data_dir / "haiku.rag.lancedb"
    capabilities = capability if capability else ["rag"]

    run_chat(
        db_path,
        read_only=True,
        model=model,
        capabilities=capabilities,
    )


@_cli.command(
    "mcp",
    help="Run the MCP server. For continuous ingestion, use haiku-ingester serve.",
)
def mcp(
    db: Path | None = typer.Option(
        None,
        "--db",
        help="Path to the LanceDB database file",
    ),
    stdio: bool = typer.Option(
        False,
        "--stdio",
        help="Run MCP server on stdio Transport",
    ),
    host: str = typer.Option(
        "127.0.0.1",
        "--host",
        help="Host to bind MCP server to (use 0.0.0.0 in containers; ignored with --stdio)",
    ),
    port: int = typer.Option(
        8001,
        "--port",
        help="Port to bind MCP server to (ignored with --stdio)",
    ),
) -> None:
    """Run the MCP server."""
    app = create_app(db)  # pragma: no cover

    transport = "stdio" if stdio else None  # pragma: no cover

    asyncio.run(  # pragma: no cover
        app.run_mcp(transport=transport, host=host, port=port)
    )


if __name__ == "__main__":  # pragma: no cover
    cli()