"""Marchwarden CLI shim.

Talks to the web researcher MCP server over stdio and pretty-prints
ResearchResult contracts to the terminal.
"""

import asyncio
import json
import os
import sys
from pathlib import Path
from typing import Optional

import click
from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
from rich.console import Console
from rich.panel import Panel
from rich.table import Table
from rich.text import Text

from researchers.web.models import ResearchResult


DEFAULT_TRACE_DIR = "~/.marchwarden/traces"


# ---------------------------------------------------------------------------
# MCP client
# ---------------------------------------------------------------------------


async def call_research_tool(
    question: str,
    depth: str,
    max_iterations: int,
    token_budget: int,
) -> ResearchResult:
    """Spawn the web researcher MCP server and call its `research` tool."""
    params = StdioServerParameters(
        command=sys.executable,
        args=["-m", "researchers.web.server"],
    )
    async with stdio_client(params) as (read, write):
        async with ClientSession(read, write) as session:
            await session.initialize()
            result = await session.call_tool(
                "research",
                arguments={
                    "question": question,
                    "depth": depth,
                    "max_iterations": max_iterations,
                    "token_budget": token_budget,
                },
            )
            # FastMCP returns the tool's string return as a TextContent block.
            payload = result.content[0].text
            return ResearchResult.model_validate_json(payload)


# ---------------------------------------------------------------------------
# Pretty printing
# ---------------------------------------------------------------------------


def render_result(result: ResearchResult, console: Console) -> None:
    """Render a ResearchResult to the console using rich."""
    # Answer
    console.print(
        Panel(
            result.answer,
            title="[bold cyan]Answer[/bold cyan]",
            border_style="cyan",
        )
    )

    # Citations
    if result.citations:
        table = Table(title="Citations", show_lines=True, expand=True)
        table.add_column("#", style="dim", width=3)
        table.add_column("Title / Locator", overflow="fold")
        table.add_column("Excerpt", overflow="fold")
        table.add_column("Conf", justify="right", width=5)
        for i, c in enumerate(result.citations, 1):
            header = f"[bold]{c.title or c.locator}[/bold]\n[dim]{c.locator}[/dim]"
            table.add_row(str(i), header, c.raw_excerpt, f"{c.confidence:.2f}")
        console.print(table)
    else:
        console.print("[dim]No citations.[/dim]")

    # Gaps grouped by category
    if result.gaps:
        gap_table = Table(title="Gaps", show_lines=True, expand=True)
        gap_table.add_column("Category", style="yellow")
        gap_table.add_column("Topic")
        gap_table.add_column("Detail", overflow="fold")
        for g in result.gaps:
            gap_table.add_row(g.category.value, g.topic, g.detail)
        console.print(gap_table)

    # Discovery events
    if result.discovery_events:
        de_table = Table(title="Discovery Events", show_lines=True, expand=True)
        de_table.add_column("Type", style="magenta")
        de_table.add_column("Suggested Researcher")
        de_table.add_column("Query", overflow="fold")
        de_table.add_column("Reason", overflow="fold")
        for d in result.discovery_events:
            de_table.add_row(
                d.type, d.suggested_researcher or "-", d.query, d.reason
            )
        console.print(de_table)

    # Open questions
    if result.open_questions:
        oq_table = Table(title="Open Questions", show_lines=True, expand=True)
        oq_table.add_column("Priority", style="green")
        oq_table.add_column("Question", overflow="fold")
        oq_table.add_column("Context", overflow="fold")
        for q in result.open_questions:
            oq_table.add_row(q.priority, q.question, q.context)
        console.print(oq_table)

    # Confidence + factors
    cf = result.confidence_factors
    conf_text = Text()
    conf_text.append(f"Overall: {result.confidence:.2f}\n", style="bold")
    conf_text.append(f"Corroborating sources: {cf.num_corroborating_sources}\n")
    conf_text.append(f"Source authority: {cf.source_authority}\n")
    conf_text.append(f"Contradiction detected: {cf.contradiction_detected}\n")
    conf_text.append(f"Query specificity match: {cf.query_specificity_match:.2f}\n")
    conf_text.append(f"Budget exhausted: {cf.budget_exhausted}\n")
    conf_text.append(f"Recency: {cf.recency or 'unknown'}")
    console.print(Panel(conf_text, title="Confidence", border_style="green"))

    # Cost
    cm = result.cost_metadata
    cost_text = Text()
    cost_text.append(f"Tokens: {cm.tokens_used}\n")
    cost_text.append(f"Iterations: {cm.iterations_run}\n")
    cost_text.append(f"Wall time: {cm.wall_time_sec:.2f}s\n")
    cost_text.append(f"Model: {cm.model_id}")
    console.print(Panel(cost_text, title="Cost", border_style="blue"))

    # Trace footer
    console.print(f"\n[dim]trace_id: {result.trace_id}[/dim]")


# ---------------------------------------------------------------------------
# Click app
# ---------------------------------------------------------------------------


@click.group()
def cli() -> None:
    """Marchwarden — agentic research CLI."""


@cli.command()
@click.argument("question")
@click.option(
    "--depth",
    type=click.Choice(["shallow", "balanced", "deep"]),
    default="balanced",
    show_default=True,
)
@click.option(
    "--budget",
    "token_budget",
    type=int,
    default=20_000,
    show_default=True,
    help="Token budget for the research loop.",
)
@click.option(
    "--max-iterations",
    type=int,
    default=5,
    show_default=True,
)
def ask(
    question: str,
    depth: str,
    token_budget: int,
    max_iterations: int,
) -> None:
    """Ask the web researcher a QUESTION."""
    console = Console()
    console.print(f"[dim]Researching:[/dim] {question}\n")
    try:
        result = asyncio.run(
            call_research_tool(
                question=question,
                depth=depth,
                max_iterations=max_iterations,
                token_budget=token_budget,
            )
        )
    except Exception as e:
        console.print(f"[bold red]Error:[/bold red] {e}")
        sys.exit(1)
    render_result(result, console)


def _resolve_trace_path(trace_id: str, trace_dir: Optional[str]) -> Path:
    """Resolve the JSONL path for a trace_id."""
    base = Path(os.path.expanduser(trace_dir or DEFAULT_TRACE_DIR))
    return base / f"{trace_id}.jsonl"


def render_trace(entries: list[dict], trace_id: str, console: Console) -> None:
    """Pretty-print a list of trace entries."""
    console.print(
        Panel(
            f"[bold]trace_id:[/bold] {trace_id}\n[bold]steps:[/bold] {len(entries)}",
            title="[cyan]Replay[/cyan]",
            border_style="cyan",
        )
    )

    if not entries:
        console.print("[dim]Trace file is empty.[/dim]")
        return

    table = Table(show_lines=True, expand=True)
    table.add_column("#", style="dim", width=4)
    table.add_column("Action", style="magenta")
    table.add_column("Decision", overflow="fold")
    table.add_column("Details", overflow="fold")
    table.add_column("Hash", style="dim", overflow="fold")

    reserved = {"step", "action", "decision", "timestamp", "content_hash"}
    for e in entries:
        step = str(e.get("step", "?"))
        action = str(e.get("action", ""))
        decision = str(e.get("decision", ""))
        content_hash = str(e.get("content_hash", "") or "")
        extras = {k: v for k, v in e.items() if k not in reserved}
        details = "\n".join(f"{k}: {v}" for k, v in extras.items())
        table.add_row(step, action, decision, details, content_hash)

    console.print(table)


@cli.command()
@click.argument("trace_id")
@click.option(
    "--trace-dir",
    default=None,
    help=f"Trace directory (default: {DEFAULT_TRACE_DIR}).",
)
def replay(trace_id: str, trace_dir: Optional[str]) -> None:
    """Replay a prior research run by TRACE_ID."""
    console = Console()
    path = _resolve_trace_path(trace_id, trace_dir)
    if not path.exists():
        console.print(
            f"[bold red]Error:[/bold red] no trace file found for "
            f"trace_id [bold]{trace_id}[/bold] at {path}"
        )
        sys.exit(1)

    entries: list[dict] = []
    with open(path, "r", encoding="utf-8") as f:
        for lineno, line in enumerate(f, 1):
            line = line.strip()
            if not line:
                continue
            try:
                entries.append(json.loads(line))
            except json.JSONDecodeError as e:
                console.print(
                    f"[bold red]Error:[/bold red] invalid JSON on line {lineno}: {e}"
                )
                sys.exit(1)

    render_trace(entries, trace_id, console)


if __name__ == "__main__":
    cli()