"""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 re
import sys
from collections import defaultdict
from datetime import datetime, timedelta, timezone
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 obs import configure_logging, get_logger
from obs.costs import DEFAULT_LEDGER_PATH
from researchers.web.models import ResearchResult


DEFAULT_TRACE_DIR = "~/.marchwarden/traces"

log = get_logger("marchwarden.cli")


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


async def call_research_tool(
    question: str,
    depth: str,
    max_iterations: Optional[int],
    token_budget: Optional[int],
) -> ResearchResult:
    """Spawn the web researcher MCP server and call its `research` tool.

    ``max_iterations`` and ``token_budget`` are optional — when None,
    the MCP server uses the depth preset (Issue #30).
    """
    params = StdioServerParameters(
        command=sys.executable,
        args=["-m", "researchers.web.server"],
        env=os.environ.copy(),
    )
    arguments: dict = {"question": question, "depth": depth}
    if max_iterations is not None:
        arguments["max_iterations"] = max_iterations
    if token_budget is not None:
        arguments["token_budget"] = token_budget
    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=arguments)
            # 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")
    budget_status = "spent" if cf.budget_exhausted else "under cap"
    conf_text.append(f"Budget status: {budget_status}\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."""
    configure_logging()


@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=None,
    help="Token budget for the research loop. Overrides the depth preset.",
)
@click.option(
    "--max-iterations",
    type=int,
    default=None,
    help="Max research loop iterations. Overrides the depth preset.",
)
def ask(
    question: str,
    depth: str,
    token_budget: Optional[int],
    max_iterations: Optional[int],
) -> None:
    """Ask the web researcher a QUESTION."""
    console = Console()
    console.print(f"[dim]Researching:[/dim] {question}\n")
    log.info(
        "ask_started",
        question=question,
        depth=depth,
        max_iterations=max_iterations,
        token_budget=token_budget,
    )
    try:
        result = asyncio.run(
            call_research_tool(
                question=question,
                depth=depth,
                max_iterations=max_iterations,
                token_budget=token_budget,
            )
        )
    except Exception as e:
        log.error("ask_failed", question=question, error=str(e), exc_info=True)
        console.print(f"[bold red]Error:[/bold red] {e}")
        sys.exit(1)
    log.info(
        "ask_completed",
        trace_id=result.trace_id,
        confidence=result.confidence,
        citations=len(result.citations),
        tokens_used=result.cost_metadata.tokens_used,
        wall_time_sec=result.cost_metadata.wall_time_sec,
    )
    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)

    # Issue #54: if the agent persisted a sibling .result.json, render
    # the full structured ResearchResult underneath the step log so
    # replay can show which gaps fired, which sources were cited, etc.
    result_path = path.parent / f"{trace_id}.result.json"
    if result_path.exists():
        try:
            result = ResearchResult.model_validate_json(
                result_path.read_text(encoding="utf-8")
            )
        except Exception as exc:
            console.print(
                f"[yellow]warning:[/yellow] could not parse {result_path.name}: {exc}"
            )
        else:
            console.print()
            render_result(result, console)
    else:
        console.print(
            "[dim]No persisted result file alongside this trace.[/dim]"
        )


# ---------------------------------------------------------------------------
# costs command
# ---------------------------------------------------------------------------


_RELATIVE_RE = re.compile(r"^(\d+)([dwhm])$")


def _parse_when(value: str) -> datetime:
    """Parse an ISO date or a relative shorthand like '7d', '24h'."""
    m = _RELATIVE_RE.match(value)
    if m:
        n = int(m.group(1))
        unit = m.group(2)
        delta = {
            "h": timedelta(hours=n),
            "d": timedelta(days=n),
            "w": timedelta(weeks=n),
            "m": timedelta(days=30 * n),
        }[unit]
        return datetime.now(timezone.utc) - delta
    # Otherwise treat as ISO date / datetime
    dt = datetime.fromisoformat(value)
    if dt.tzinfo is None:
        dt = dt.replace(tzinfo=timezone.utc)
    return dt


def _load_ledger(path: Path) -> list[dict]:
    if not path.exists():
        return []
    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:
                # Skip a corrupt line rather than blow up the whole report
                continue
    return entries


def _filter_entries(
    entries: list[dict],
    since: Optional[datetime],
    until: Optional[datetime],
    model: Optional[str],
) -> list[dict]:
    out = []
    for e in entries:
        ts_str = e.get("timestamp", "")
        try:
            ts = datetime.fromisoformat(ts_str.replace("Z", "+00:00"))
        except ValueError:
            continue
        if since and ts < since:
            continue
        if until and ts > until:
            continue
        if model and e.get("model_id") != model:
            continue
        out.append(e)
    return out


def render_costs(entries: list[dict], console: Console) -> None:
    """Render a cost summary from filtered ledger entries."""
    if not entries:
        console.print("[dim]No cost data yet.[/dim]")
        return

    total_calls = len(entries)
    total_tokens = sum(e.get("tokens_used", 0) for e in entries)
    total_input = sum(e.get("tokens_input") or 0 for e in entries)
    total_output = sum(e.get("tokens_output") or 0 for e in entries)
    total_tavily = sum(e.get("tavily_searches", 0) for e in entries)
    total_spend = sum(
        e.get("estimated_cost_usd") or 0.0 for e in entries
    )
    unknown_cost_calls = sum(
        1 for e in entries if e.get("estimated_cost_usd") is None
    )

    # Summary panel
    summary = Text()
    summary.append(f"Calls: {total_calls}\n", style="bold")
    summary.append(f"Total spend: ${total_spend:.4f}\n", style="bold green")
    summary.append(f"Total tokens: {total_tokens:,} ")
    summary.append(f"(in {total_input:,} / out {total_output:,})\n", style="dim")
    summary.append(f"Tavily searches: {total_tavily}\n")
    if unknown_cost_calls:
        summary.append(
            f"Calls with unknown model price: {unknown_cost_calls}\n",
            style="yellow",
        )
    console.print(Panel(summary, title="Cost Summary", border_style="green"))

    # Per-day breakdown
    per_day: dict[str, dict] = defaultdict(lambda: {"calls": 0, "tokens": 0, "spend": 0.0})
    for e in entries:
        day = e.get("timestamp", "")[:10]
        per_day[day]["calls"] += 1
        per_day[day]["tokens"] += e.get("tokens_used", 0)
        per_day[day]["spend"] += e.get("estimated_cost_usd") or 0.0
    day_table = Table(title="Per Day", show_lines=False, expand=True)
    day_table.add_column("Date", style="dim")
    day_table.add_column("Calls", justify="right")
    day_table.add_column("Tokens", justify="right")
    day_table.add_column("Spend (USD)", justify="right", style="green")
    for day in sorted(per_day.keys()):
        d = per_day[day]
        day_table.add_row(
            day, str(d["calls"]), f"{d['tokens']:,}", f"${d['spend']:.4f}"
        )
    console.print(day_table)

    # Per-model breakdown
    per_model: dict[str, dict] = defaultdict(
        lambda: {"calls": 0, "tokens": 0, "spend": 0.0}
    )
    for e in entries:
        m = e.get("model_id", "(unknown)")
        per_model[m]["calls"] += 1
        per_model[m]["tokens"] += e.get("tokens_used", 0)
        per_model[m]["spend"] += e.get("estimated_cost_usd") or 0.0
    model_table = Table(title="Per Model", show_lines=False, expand=True)
    model_table.add_column("Model")
    model_table.add_column("Calls", justify="right")
    model_table.add_column("Tokens", justify="right")
    model_table.add_column("Spend (USD)", justify="right", style="green")
    for m in sorted(per_model.keys()):
        d = per_model[m]
        model_table.add_row(
            m, str(d["calls"]), f"{d['tokens']:,}", f"${d['spend']:.4f}"
        )
    console.print(model_table)

    # Highest-cost call
    costed = [e for e in entries if e.get("estimated_cost_usd") is not None]
    if costed:
        top = max(costed, key=lambda e: e["estimated_cost_usd"])
        top_text = Text()
        top_text.append(f"trace_id: {top.get('trace_id', '?')}\n")
        top_text.append(f"question: {top.get('question', '')[:120]}\n")
        top_text.append(f"model: {top.get('model_id', '?')}\n")
        top_text.append(f"tokens: {top.get('tokens_used', 0):,}\n")
        top_text.append(
            f"spend: ${top.get('estimated_cost_usd', 0):.4f}\n",
            style="bold green",
        )
        console.print(
            Panel(top_text, title="Highest-Cost Call", border_style="yellow")
        )


@cli.command()
@click.option(
    "--since",
    default=None,
    help="Filter by start time. ISO date or relative (e.g. 7d, 24h, 2w).",
)
@click.option(
    "--until",
    default=None,
    help="Filter by end time. ISO date or relative.",
)
@click.option(
    "--model",
    default=None,
    help="Filter to a specific model_id.",
)
@click.option(
    "--json",
    "as_json",
    is_flag=True,
    default=False,
    help="Emit raw filtered ledger entries as JSON instead of the table.",
)
@click.option(
    "--ledger",
    default=None,
    help=f"Override ledger path (default: {DEFAULT_LEDGER_PATH}).",
)
def costs(
    since: Optional[str],
    until: Optional[str],
    model: Optional[str],
    as_json: bool,
    ledger: Optional[str],
) -> None:
    """Show cost summary from the research ledger."""
    console = Console()
    path = Path(os.path.expanduser(ledger or DEFAULT_LEDGER_PATH))
    entries = _load_ledger(path)

    since_dt = _parse_when(since) if since else None
    until_dt = _parse_when(until) if until else None
    filtered = _filter_entries(entries, since_dt, until_dt, model)

    if as_json:
        for e in filtered:
            click.echo(json.dumps(e))
        return

    render_costs(filtered, console)


# ---------------------------------------------------------------------------
# arxiv subgroup (M5.1.1)
# ---------------------------------------------------------------------------


@cli.group()
def arxiv() -> None:
    """Manage the local arxiv-rag corpus.

    Sub-commands let you ingest arxiv papers, list what's indexed, and
    inspect individual entries. Retrieval and search ship in #39+.
    """


@arxiv.command("add")
@click.argument("arxiv_ids", nargs=-1, required=True)
@click.option(
    "--embedding-model",
    default=None,
    help=(
        "Override embedding model. Defaults to "
        "$MARCHWARDEN_ARXIV_EMBED_MODEL or nomic-ai/nomic-embed-text-v1.5."
    ),
)
def arxiv_add(arxiv_ids: tuple[str, ...], embedding_model: Optional[str]) -> None:
    """Download, extract, embed, and index one or more arxiv papers by ID."""
    # Imported lazily so the CLI doesn't pay the chromadb / torch import
    # cost on every invocation — only when the user actually runs an
    # arxiv command.
    from researchers.arxiv.ingest import DEFAULT_EMBEDDING_MODEL, ingest
    from researchers.arxiv.store import ArxivStore

    console = Console()
    store = ArxivStore()
    model = embedding_model or DEFAULT_EMBEDDING_MODEL

    for arxiv_id in arxiv_ids:
        console.print(f"[dim]Ingesting:[/dim] {arxiv_id} (model={model})")
        try:
            record = ingest(arxiv_id, store=store, model_name=model)
        except Exception as exc:
            console.print(f"[bold red]Failed:[/bold red] {arxiv_id}: {exc}")
            continue
        console.print(
            f"  -> [green]ok[/green] {record.title or '(no title)'} "
            f"({record.chunks_indexed} chunks)"
        )


@arxiv.command("list")
def arxiv_list() -> None:
    """Show all indexed arxiv papers."""
    from researchers.arxiv.store import ArxivStore

    console = Console()
    store = ArxivStore()
    papers = store.list_papers()

    if not papers:
        console.print(
            "[dim]No papers indexed yet. Use[/dim] "
            "[bold]marchwarden arxiv add <id>[/bold]"
        )
        return

    table = Table(title=f"Indexed papers ({len(papers)})", show_lines=False, expand=True)
    table.add_column("arxiv_id", style="cyan")
    table.add_column("Title", overflow="fold")
    table.add_column("Year", justify="right", width=6)
    table.add_column("Chunks", justify="right", width=6)
    table.add_column("Model", overflow="fold")
    for p in papers:
        table.add_row(
            p.arxiv_id,
            p.title or "(no title)",
            str(p.year) if p.year else "—",
            str(p.chunks_indexed),
            p.embedding_model,
        )
    console.print(table)


@arxiv.command("info")
@click.argument("arxiv_id")
def arxiv_info(arxiv_id: str) -> None:
    """Show metadata + chunk count for one indexed paper."""
    from researchers.arxiv.store import ArxivStore

    console = Console()
    store = ArxivStore()
    record = store.get_paper(arxiv_id)
    if record is None:
        console.print(
            f"[bold red]Not indexed:[/bold red] {arxiv_id}. "
            f"Use [bold]marchwarden arxiv add {arxiv_id}[/bold]."
        )
        sys.exit(1)

    text = Text()
    text.append(f"arxiv_id: {record.arxiv_id}\n", style="bold")
    text.append(f"title: {record.title or '(none)'}\n")
    text.append(f"authors: {', '.join(record.authors) or '(none)'}\n")
    text.append(f"year: {record.year or '(unknown)'}\n")
    text.append(f"category: {record.category or '(unknown)'}\n")
    text.append(f"chunks: {record.chunks_indexed}\n")
    text.append(f"embedding_model: {record.embedding_model}\n")
    text.append(f"added_at: {record.added_at}\n")
    console.print(Panel(text, title=arxiv_id, border_style="cyan"))


@arxiv.command("remove")
@click.argument("arxiv_id")
def arxiv_remove(arxiv_id: str) -> None:
    """Drop one paper from the manifest and chromadb collection."""
    from researchers.arxiv.store import ArxivStore

    console = Console()
    store = ArxivStore()
    chunks_removed = store.delete_paper(arxiv_id)
    in_manifest = store.remove_paper(arxiv_id)
    if not in_manifest and chunks_removed == 0:
        console.print(f"[yellow]Not found:[/yellow] {arxiv_id}")
        sys.exit(1)
    console.print(
        f"[green]Removed[/green] {arxiv_id} "
        f"({chunks_removed} chunks dropped)"
    )


if __name__ == "__main__":
    cli()