"""Command-line interface for REM database.

All CLI commands delegate to Rust implementation for performance.
"""

import typer
from typing import Optional
from typing_extensions import Annotated
from pathlib import Path
from rich.console import Console
from rich.table import Table
import json

app = typer.Typer(help="REM Database CLI")
console = Console()


@app.command()
def init(
    path: Annotated[Path, typer.Option("--path", help="Database directory path")] = Path("./data"),
):
    """Initialize database.

    Creates database directory and column families.

    Example:
        rem init --path ./data
    """
    # TODO: Implement database initialization
    console.print(f"[green]✓[/green] Initialized database at {path}")


@app.command("schema")
def schema_cmd():
    """Schema management commands."""
    pass


@app.command("schema-add")
def schema_add(
    schema_ref: Annotated[str, typer.Argument(help="Schema reference (file.py::ModelName)")],
):
    """Register Pydantic schema.

    Example:
        rem schema-add models.py::Article
    """
    # TODO: Load Pydantic model and register schema
    console.print(f"[green]✓[/green] Registered schema: {schema_ref}")


@app.command("schema-list")
def schema_list():
    """List registered schemas.

    Example:
        rem schema-list
    """
    # TODO: Get schemas from database
    table = Table(title="Registered Schemas")
    table.add_column("Name", style="cyan")
    table.add_column("Version", style="green")
    table.add_column("Embedding Fields", style="yellow")
    table.add_column("Indexed Fields", style="blue")

    # TODO: Add rows from database
    console.print(table)


@app.command()
def insert(
    table: Annotated[str, typer.Argument(help="Table name")],
    data: Annotated[Optional[str], typer.Argument(help="JSON data")] = None,
    batch: Annotated[bool, typer.Option("--batch", help="Batch insert from stdin")] = False,
):
    """Insert entity or batch insert from stdin.

    Examples:
        rem insert articles '{"title": "...", "content": "..."}'
        cat data.jsonl | rem insert articles --batch
    """
    # TODO: Parse JSON and insert
    if batch:
        # TODO: Read JSONL from stdin and batch insert
        console.print("[green]✓[/green] Batch insert complete")
    else:
        # TODO: Single insert
        console.print(f"[green]✓[/green] Inserted entity with ID: <uuid>")


@app.command()
def ingest(
    file_path: Annotated[Path, typer.Argument(help="Document file path")],
    schema: Annotated[str, typer.Option("--schema", help="Target schema name")] = "resources",
):
    """Upload and chunk document file.

    Example:
        rem ingest tutorial.pdf --schema=articles
    """
    # TODO: Parse document, chunk, and insert
    console.print(f"[green]✓[/green] Ingested {file_path} as {schema}")


@app.command()
def get(
    entity_id: Annotated[str, typer.Argument(help="Entity UUID")],
):
    """Get entity by ID.

    Example:
        rem get 550e8400-e29b-41d4-a716-446655440000
    """
    # TODO: Get entity from database
    console.print_json('{"id": "...", "properties": {...}}')


@app.command()
def lookup(
    key_value: Annotated[str, typer.Argument(help="Key field value")],
):
    """Global key lookup.

    Example:
        rem lookup "Python Guide"
    """
    # TODO: Lookup entities by key
    console.print_json('[{"id": "...", "properties": {...}}]')


@app.command()
def search(
    query: Annotated[str, typer.Argument(help="Search query")],
    schema: Annotated[str, typer.Option("--schema", help="Schema name")] = "resources",
    top_k: Annotated[int, typer.Option("--top-k", help="Number of results")] = 10,
):
    """Semantic search using vector embeddings.

    Example:
        rem search "async programming" --schema=articles --top-k=5
    """
    # TODO: Perform vector search
    console.print_json('[{"entity": {...}, "score": 0.95}]')


@app.command()
def query(
    sql: Annotated[str, typer.Argument(help="SQL query")],
):
    """Execute SQL query.

    Example:
        rem query "SELECT * FROM articles WHERE category = 'programming'"
    """
    # TODO: Execute SQL query
    console.print_json('[{"id": "...", "properties": {...}}]')


@app.command()
def ask(
    question: Annotated[str, typer.Argument(help="Natural language question")],
    plan: Annotated[bool, typer.Option("--plan", help="Show query plan without executing")] = False,
    max_stages: Annotated[int, typer.Option("--max-stages", help="Maximum retry stages")] = 2,
    schema: Annotated[Optional[str], typer.Option("--schema", help="Schema hint")] = None,
    model: Annotated[Optional[str], typer.Option("--model", help="LLM model override")] = None,
):
    """Natural language query using LLM.

    Examples:
        rem ask "show recent programming articles"
        rem ask "show recent articles" --plan
        rem ask "bob" --schema employees
        rem ask "specific query" --max-stages 3
        rem ask "query" --model gpt-3.5-turbo
    """
    # TODO: Generate and optionally execute query with multi-stage support
    if plan:
        console.print_json(
            """{
    "confidence": 0.95,
    "query": "SELECT * FROM articles WHERE category = 'programming' ORDER BY created_at DESC LIMIT 10",
    "reasoning": "User wants recent articles filtered by programming category",
    "requires_search": false,
    "next_steps": ["Broaden category if no results", "Try semantic search"]
}"""
        )
    else:
        # TODO: Execute with stages
        console.print_json(
            """{
    "results": [{"id": "...", "properties": {...}}],
    "query": "SELECT * FROM articles...",
    "query_type": "sql",
    "confidence": 0.95,
    "stages": 1,
    "stage_results": [5],
    "total_time_ms": 250
}"""
        )


@app.command()
def traverse(
    entity_id: Annotated[str, typer.Argument(help="Starting entity UUID")],
    depth: Annotated[int, typer.Option("--depth", help="Traversal depth")] = 2,
    direction: Annotated[str, typer.Option("--direction", help="Direction (out/in/both)")] = "out",
):
    """Graph traversal from entity.

    Example:
        rem traverse 550e8400-... --depth=2 --direction=out
    """
    # TODO: Perform graph traversal
    console.print_json('["uuid1", "uuid2", "uuid3"]')


@app.command()
def export(
    table: Annotated[str, typer.Argument(help="Table name")],
    output: Annotated[Path, typer.Option("--output", help="Output file path")] = Path("./export.parquet"),
    all_tables: Annotated[bool, typer.Option("--all", help="Export all tables")] = False,
):
    """Export entities to Parquet/CSV/JSONL.

    Examples:
        rem export articles --output ./data.parquet
        rem export --all --output ./exports/
    """
    # TODO: Export data
    console.print(f"[green]✓[/green] Exported to {output}")


@app.command()
def serve(
    host: Annotated[str, typer.Option("--host", help="gRPC server host")] = "0.0.0.0",
    port: Annotated[int, typer.Option("--port", help="gRPC server port")] = 50051,
):
    """Start replication server (primary mode).

    Example:
        rem serve --host 0.0.0.0 --port 50051
    """
    # TODO: Start gRPC replication server
    console.print(f"[green]✓[/green] Replication server listening on {host}:{port}")


@app.command()
def replicate(
    primary: Annotated[str, typer.Option("--primary", help="Primary host:port")] = "localhost:50051",
    follow: Annotated[bool, typer.Option("--follow", help="Follow primary in real-time")] = False,
):
    """Connect to primary and replicate (replica mode).

    Examples:
        rem replicate --primary=localhost:50051 --follow
    """
    # TODO: Connect to primary and sync
    console.print(f"[green]✓[/green] Connected to primary {primary}")


@app.command("replication")
def replication_cmd():
    """Replication status commands."""
    pass


@app.command("replication-wal-status")
def replication_wal_status():
    """Show WAL status.

    Example:
        rem replication wal-status
    """
    # TODO: Get WAL status
    console.print_json(
        """{
    "sequence": 1,
    "entries": 1,
    "size_bytes": 512
}"""
    )


@app.command("replication-status")
def replication_status():
    """Show replication status.

    Example:
        rem replication status
    """
    # TODO: Get replication status
    console.print_json(
        """{
    "mode": "replica",
    "primary": "localhost:50051",
    "wal_position": 1,
    "lag_ms": 2,
    "status": "synced"
}"""
    )


if __name__ == "__main__":
    app()
