"""supervise: list pending supervise proposals across all bottles and
act on them (approve / modify / reject).

Curses-based TUI; modify-then-approve shells out to $EDITOR. The
Egress proposals are queued for operator review as full routes.yaml
updates.
"""

from __future__ import annotations

import argparse
import curses
import os
import subprocess
import sys
import tempfile
import traceback
from dataclasses import dataclass
from datetime import datetime, timezone
from pathlib import Path

from ..paths import bot_bottle_root
from ..log import Die, error, info
from ..orchestrator.client import (
    OrchestratorClient,
    OrchestratorClientError,
    discover_orchestrator_url,
)

from ..supervise import (
    Proposal,
    TOOL_EGRESS_ALLOW,
    TOOL_EGRESS_BLOCK,
    TOOL_GITLEAKS_ALLOW,
    TOOL_EGRESS_TOKEN_ALLOW,
)
from ._common import PROG


_REFRESH_INTERVAL_MS = 1000

# Proposal tools whose payload is a read-only report, not a file the operator
# edits: modify is unavailable and approval requires a recorded reason for the
# audit trail.
_REPORT_ONLY_TOOLS: tuple[str, ...] = (TOOL_GITLEAKS_ALLOW, TOOL_EGRESS_TOKEN_ALLOW)


@dataclass(frozen=True)
class QueuedProposal:
    """A pending proposal from the supervise queue."""

    proposal: Proposal


# A failed operator action (orchestrator unreachable, bottle torn down,
# 409) is caught by the TUI key handlers and surfaced in the status line so
# the proposal stays pending rather than crashing curses.
ApplyError = (OrchestratorClientError,)


# The one per-host orchestrator, discovered lazily on first use. Every
# operator action — list, approve, reject — goes through its HTTP control
# plane (the orchestrator owns the single DB + live policy); there is no
# direct-DB path and no backend branching here.
_client_instance: OrchestratorClient | None = None


def _resolve_orchestrator_url() -> str:
    """URL of the running orchestrator control plane, starting one on demand.

    Supervise is often the first thing an operator runs — before any bottle
    has booted the control plane. So when discovery finds nothing, bring up
    the selected backend's orchestrator + gateway (idempotent) rather than
    failing with "launch a bottle first"."""
    try:
        return discover_orchestrator_url()
    except OrchestratorClientError:
        from ..backend import get_bottle_backend
        backend = get_bottle_backend()
        info(f"no orchestrator control plane running; starting one ({backend.name})…")
        return backend.ensure_orchestrator()


def _client() -> OrchestratorClient:
    global _client_instance  # noqa: PLW0603 — CLI-session singleton
    if _client_instance is None:
        _client_instance = OrchestratorClient(_resolve_orchestrator_url())
    return _client_instance


def discover_pending() -> list[QueuedProposal]:
    """Collect pending proposals across bottles from the orchestrator."""
    out = [
        QueuedProposal(proposal=Proposal.from_dict(d))
        for d in _client().supervise_pending()
    ]
    out.sort(key=lambda q: q.proposal.arrival_timestamp)
    return out


def _approval_status(qp: QueuedProposal, verb: str) -> str:
    """Status-line text after a successful approval."""
    base = f"{verb} {qp.proposal.tool} for [{qp.proposal.bottle_slug}]"
    return f"{base}; resume: ./cli.py resume {qp.proposal.bottle_slug}"


def _detail_lines(
    qp: QueuedProposal,
    *,
    green_attr: int = 0,
) -> list[tuple[str, int]]:
    """Return the detail-view body as (text, curses-attr) tuples."""
    p = qp.proposal
    out: list[tuple[str, int]] = [
        (f"bottle: {p.bottle_slug}", 0),
        (f"tool: {p.tool}", 0),
        (f"id: {p.id}", 0),
        (f"arrived: {p.arrival_timestamp}", 0),
        ("", 0),
        ("justification:", 0),
    ]
    out.extend(("  " + line, 0) for line in p.justification.splitlines() or [""])
    out.extend([
        ("", 0),
        ("proposed file:", 0),
    ])
    out.extend((line, 0) for line in p.proposed_file.splitlines() or [""])
    return out


def _suffix_for_tool(tool: str) -> str:
    if tool in (TOOL_EGRESS_ALLOW, TOOL_EGRESS_BLOCK):
        return ".yaml"
    if tool in (TOOL_GITLEAKS_ALLOW, TOOL_EGRESS_TOKEN_ALLOW):
        return ".txt"
    return ".txt"


# --- Operator actions ------------------------------------------------------


def approve(
    qp: QueuedProposal,
    *,
    notes: str = "",
    final_file: str | None = None,
) -> None:
    """Approve (or, with `final_file`, modify-then-approve) via the
    orchestrator: it applies the route change to the bottle's live policy,
    writes the response that unblocks the agent, and audits it — one atomic
    server-side op. Raises `OrchestratorClientError` on failure."""
    _client().supervise_respond(
        qp.proposal.id,
        bottle_slug=qp.proposal.bottle_slug,
        decision="modify" if final_file is not None else "approve",
        notes=notes,
        final_file=final_file,
    )


def reject(qp: QueuedProposal, *, reason: str) -> None:
    """Reject via the orchestrator (writes the response + audit)."""
    _client().supervise_respond(
        qp.proposal.id,
        bottle_slug=qp.proposal.bottle_slug,
        decision="reject",
        notes=reason,
    )


def _approve_from_tui(
    stdscr: "curses._CursesWindow",  # type: ignore
    qp: QueuedProposal,
    *,
    final_file: str | None = None,
    notes: str = "",
) -> str:
    """Approve from curses, prompting for any tool-specific audit note."""
    if qp.proposal.tool in _REPORT_ONLY_TOOLS and final_file is None:
        notes = _prompt(stdscr, "allow reason (false positive / legitimately needed): ")
        if not notes:
            return "approve aborted (empty reason)"
    approve(qp, final_file=final_file, notes=notes)
    verb = "modified+approved" if final_file is not None else "approved"
    return _approval_status(qp, verb)


# --- $EDITOR integration --------------------------------------------------


def edit_in_editor(content: str, *, suffix: str = ".tmp") -> str | None:
    """Open `content` in $EDITOR and return edited content, if changed."""
    editor = os.environ.get("EDITOR", "vim")
    with tempfile.NamedTemporaryFile(
        mode="w", suffix=suffix, delete=False, prefix="supervise-modify.",
    ) as f:
        f.write(content)
        path = f.name
    try:
        subprocess.run([editor, path], check=False)
        with open(path, encoding="utf-8") as f:
            edited = f.read()
        return edited if edited != content else None
    finally:
        try:
            os.unlink(path)
        except OSError:
            pass


# --- TUI -------------------------------------------------------------------


def cmd_supervise(argv: list[str]) -> int:
    parser = argparse.ArgumentParser(prog=f"{PROG} supervise", add_help=True)
    parser.add_argument(
        "--once", action="store_true",
        help="list pending proposals once and exit (no TUI)",
    )
    args = parser.parse_args(argv)

    # Establish the orchestrator connection up front so a missing control
    # plane is a clean one-line error, not a curses crash mid-loop. This also
    # starts the orchestrator on demand when none is running (see `_client`).
    try:
        _client()
    except OrchestratorClientError as e:
        error(str(e))
        return 1
    except Die as e:
        # Backend has no orchestrator to start (e.g. macos-container).
        if e.message:
            error(e.message)
        return e.code if isinstance(e.code, int) else 1

    if args.once:
        return _list_once()
    try:
        curses.wrapper(_main_loop)
    except KeyboardInterrupt:
        return 130
    except Die as e:
        if e.message:
            error(e.message)
        else:
            error("supervise exited on a fatal error (no detail captured).")
        return e.code if isinstance(e.code, int) else 1
    except Exception as e:  # noqa: W0718 — catch supervise crash for logging
        log_path = _write_crash_log(e)
        error(
            f"supervise crashed: {type(e).__name__}: {e}",
            context={"error_type": type(e).__name__, "crash_log": str(log_path)},
        )
        error(f"full traceback written to {log_path}")
        return 1
    return 0


def _write_crash_log(exc: BaseException) -> Path:
    """Persist `exc`'s traceback to a stable file under ~/.bot-bottle/."""
    stamp = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
    body = "".join(
        traceback.format_exception(type(exc), exc, exc.__traceback__)
    )
    entry = f"=== supervise crash {stamp} ===\n{body}\n"
    try:
        log_dir = bot_bottle_root() / "logs"
        log_dir.mkdir(parents=True, exist_ok=True)
        path = log_dir / "supervise-crash.log"
        with path.open("a", encoding="utf-8") as fh:
            fh.write(entry)
        return path
    except OSError:
        fd, tmp = tempfile.mkstemp(
            prefix="bot-bottle-supervise-crash-", suffix=".log",
        )
        with os.fdopen(fd, "w", encoding="utf-8") as fh:
            fh.write(entry)
        return Path(tmp)


def _list_once() -> int:
    pending = discover_pending()
    if not pending:
        info("no pending proposals")
        return 0
    for qp in pending:
        sys.stdout.write(
            f"{qp.proposal.arrival_timestamp}  "
            f"[{qp.proposal.bottle_slug}]  "
            f"{qp.proposal.tool}  "
            f"{qp.proposal.id}\n"
        )
        sys.stdout.write(f"    {qp.proposal.justification}\n")
    return 0


def _try_init_green() -> int:  # pragma: no cover
    """Initialise a green color pair and return its attr, or 0."""
    try:
        curses.start_color()
        curses.use_default_colors()
        curses.init_pair(1, curses.COLOR_GREEN, -1)
        return curses.color_pair(1)
    except curses.error:
        return 0


def _main_loop(stdscr: "curses._CursesWindow") -> None:  # type: ignore  # pragma: no cover
    curses.curs_set(0)
    stdscr.timeout(_REFRESH_INTERVAL_MS)
    green_attr = _try_init_green()
    selected = 0
    status_line = ""
    seen_ids: set[str] = set()

    while True:
        pending = discover_pending()
        if selected >= len(pending):
            selected = max(0, len(pending) - 1)

        live_ids = {qp.proposal.id for qp in pending}
        newly_arrived = live_ids - seen_ids
        if seen_ids and newly_arrived:
            try:
                curses.beep()
            except curses.error:
                pass
            for i, qp in enumerate(pending):
                if qp.proposal.id in newly_arrived:
                    selected = i
                    break
        seen_ids = live_ids

        _render(
            stdscr, pending, selected, status_line,
            green_attr=green_attr,
        )

        try:
            key = stdscr.getch()
        except KeyboardInterrupt:
            return

        if key == -1:
            continue

        status_line = ""

        if key in (ord("q"), 27):
            return

        if not pending:
            continue
        qp = pending[selected]

        if key in (curses.KEY_DOWN, ord("j")):
            selected = min(selected + 1, len(pending) - 1)
        elif key in (curses.KEY_UP, ord("k")):
            selected = max(selected - 1, 0)
        elif key in (curses.KEY_ENTER, 10, 13):
            _detail_view(stdscr, qp, green_attr=green_attr)
        elif key == ord("a"):
            try:
                status_line = _approve_from_tui(stdscr, qp)
            except ApplyError as e:
                status_line = f"apply failed: {e}"
        elif key == ord("m"):
            if qp.proposal.tool in _REPORT_ONLY_TOOLS:
                status_line = f"modify unavailable for {qp.proposal.tool}"
                continue
            edited = _modify(stdscr, qp)
            if edited is None:
                status_line = "modify aborted (no change)"
            else:
                try:
                    status_line = _approve_from_tui(
                        stdscr, qp, final_file=edited,
                        notes="operator modified before approving",
                    )
                except ApplyError as e:
                    status_line = f"apply failed: {e}"
        elif key == ord("r"):
            reason = _prompt(stdscr, "reject reason: ")
            if reason:
                reject(qp, reason=reason)
                status_line = f"rejected {qp.proposal.tool} for [{qp.proposal.bottle_slug}]"
            else:
                status_line = "reject aborted (empty reason)"


def _render(
    stdscr: "curses._CursesWindow",  # type: ignore
    pending: list[QueuedProposal],
    selected: int,
    status_line: str,
    *,
    green_attr: int = 0,  # noqa: F841 — unused, but required by interface
) -> None:  # pragma: no cover
    stdscr.erase()
    h, w = stdscr.getmaxyx()
    header = f"bot-bottle supervise  ({len(pending)} pending)"
    stdscr.addnstr(0, 0, header, w - 1, curses.A_BOLD)
    stdscr.hline(1, 0, curses.ACS_HLINE, w)

    row = 2
    if not pending:
        stdscr.addnstr(
            row, 2,
            "no pending proposals; agents will queue here when they call a "
            "supervise tool",
            w - 4,
        )
    else:
        for i, qp in enumerate(pending):
            if row >= h - 3:
                break
            p = qp.proposal
            ts_short = (
                p.arrival_timestamp.split("T", 1)[1][:8]
                if "T" in p.arrival_timestamp else p.arrival_timestamp
            )
            cursor = "> " if i == selected else "  "
            line = (
                f"{cursor}{ts_short}  "
                f"[{p.bottle_slug}]  {p.tool:<18}  {p.id[:8]}"
            )
            attr = curses.A_REVERSE if i == selected else curses.A_NORMAL
            stdscr.addnstr(row, 0, line, w - 1, attr)
            row += 1
            if row >= h - 3:
                break
            if p.justification:
                stdscr.addnstr(row, 4, p.justification[: max(0, w - 5)], w - 5)
                row += 1

    footer = "[j/k] move  [Enter] view  [a] approve  [m] modify  [r] reject  [q] quit"
    stdscr.hline(h - 2, 0, curses.ACS_HLINE, w)
    stdscr.addnstr(h - 1, 0, footer, w - 1, curses.A_DIM)
    if status_line:
        stdscr.addnstr(h - 3, 0, status_line, w - 1, curses.A_BOLD)
    stdscr.refresh()


def _detail_view(
    stdscr: "curses._CursesWindow",  # type: ignore
    qp: QueuedProposal,
    *,
    green_attr: int = 0,
) -> None:  # pragma: no cover
    """Render the full proposal. Scrollable. Press q to return."""
    lines = _detail_lines(qp, green_attr=green_attr)
    offset = 0
    while True:
        stdscr.erase()
        h, w = stdscr.getmaxyx()
        for i, (text, attr) in enumerate(lines[offset:offset + h - 1]):
            stdscr.addnstr(i, 0, text, w - 1, attr)
        stdscr.addnstr(
            h - 1, 0,
            "[j/k] scroll  [g/G] top/bottom  [a] approve  [m] modify  [r] reject  [q] back",
            w - 1, curses.A_DIM,
        )
        stdscr.refresh()
        key = stdscr.getch()
        if key in (ord("q"), 27):
            return
        if key in (curses.KEY_DOWN, ord("j")):
            offset = min(offset + 1, max(0, len(lines) - 1))
        elif key in (curses.KEY_UP, ord("k")):
            offset = max(offset - 1, 0)
        elif key == ord("g"):
            offset = 0
        elif key == ord("G"):
            offset = max(0, len(lines) - 1)
        elif key == ord("a"):
            try:
                _approve_from_tui(stdscr, qp)
            except ApplyError:
                pass
            return
        elif key == ord("m"):
            if qp.proposal.tool in _REPORT_ONLY_TOOLS:
                return
            edited = _modify(stdscr, qp)
            if edited is not None:
                try:
                    _approve_from_tui(
                        stdscr, qp, final_file=edited,
                        notes="operator modified before approving",
                    )
                except ApplyError:
                    pass
            return
        elif key == ord("r"):
            reason = _prompt(stdscr, "reject reason: ")
            if reason:
                reject(qp, reason=reason)
            return


def _modify(stdscr: "curses._CursesWindow", qp: QueuedProposal) -> str | None:  # type: ignore  # pragma: no cover
    """Suspend curses, open $EDITOR on the proposed file, return edited content."""
    suffix = _suffix_for_tool(qp.proposal.tool)
    curses.endwin()
    try:
        edited = edit_in_editor(qp.proposal.proposed_file, suffix=suffix)
    finally:
        stdscr.refresh()
    return edited


def _prompt(stdscr: "curses._CursesWindow", label: str) -> str:  # type: ignore  # pragma: no cover
    """One-line input at the bottom of the screen."""
    curses.curs_set(1)
    h, _ = stdscr.getmaxyx()
    stdscr.move(h - 2, 0)
    stdscr.clrtoeol()
    stdscr.addstr(h - 2, 0, label)
    stdscr.refresh()
    curses.echo()
    try:
        raw = stdscr.getstr(h - 2, len(label), 200)
    finally:
        curses.noecho()
        curses.curs_set(0)
    return raw.decode("utf-8", errors="replace").strip()


__all__ = [
    "QueuedProposal",
    "approve",
    "cmd_supervise",
    "discover_pending",
    "edit_in_editor",
    "reject",
]