"""Tool-progress frame emission (M2): the tool.start / tool.end lifecycle.

Mixin for ``adapter.IrisAdapter``. The gateway accumulates tool lines in one
editable bubble; on an edit the full buffer is re-sent, so new lines are
diffed against ``seen_tool_lines`` and each new tool closes the previously
open one (attaching the output/duration captured by the ``post_tool_call``
hook).
"""

from typing import Any

from gateway.platforms.base import SendResult

from . import protocol
from .classify import (
    _extract_code_block,
    _extract_verbose_args,
    _mint_message_id,
    _parse_tool_line,
    _short_preview_from_args,
    _TurnState,
)
from .hooks import _reset_tool_results, _tool_emoji, _tool_end_fields
from .mixin_base import IrisAdapterBase


class ToolProgressHandlers(IrisAdapterBase):
    """Tool-progress lifecycle (see module docstring)."""

    async def _emit_tool_lines(
        self,
        chat_id: str,
        content: str,
        state: _TurnState,
        thread_id: str | None,
        *,
        is_edit: bool,
    ) -> SendResult:
        """Emit ``tool.start`` for each NEW tool line in *content*.

        The gateway accumulates tool lines in one editable bubble; on an edit
        the full buffer is re-sent, so we diff against ``seen_tool_lines`` to
        emit only the new ones. A new tool closes the previously-open tool.
        """
        message_id = state.tool_msg_id or _mint_message_id()
        state.tool_msg_id = message_id
        state.active = True
        # Tool activity marks this lane as the turn in flight: the global
        # post_tool_call hook (no chat id) routes todo emissions here.
        self._active_lane = (chat_id, thread_id)

        lines = [ln for ln in content.splitlines() if ln.strip()]
        for line in lines:
            key = line.strip()
            if key in state.seen_tool_lines:
                continue
            state.seen_tool_lines.add(key)
            parsed = self._parse_tool_line_or_block(line, content)
            if parsed is None:
                continue
            name, preview, args = parsed
            # A new tool begins: close the previously-open one, attaching the
            # output/duration/ok captured by the post_tool_call hook.
            if state.open_tool_index is not None:
                extra = _tool_end_fields(state.open_tool_name or "")
                await self._broadcast_or_log(
                    chat_id,
                    protocol.tool_end(
                        chat_id,
                        state.open_tool_index,
                        state.open_tool_name or "",
                        ok=extra.get("ok", True),
                        duration=extra.get("duration"),
                        output_preview=extra.get("output_preview"),
                        thread_id=thread_id,
                    ),
                )
            state.tool_index += 1
            state.open_tool_index = state.tool_index
            state.open_tool_name = name
            await self._broadcast_or_log(
                chat_id,
                protocol.tool_start(
                    chat_id,
                    state.tool_index,
                    name,
                    preview=preview,
                    args=args,
                    emoji=_tool_emoji(name),
                    thread_id=thread_id,
                ),
            )
        return SendResult(success=True, message_id=message_id)

    @staticmethod
    def _parse_tool_line_or_block(
        line: str, content: str
    ) -> tuple[str, str | None, dict[str, Any] | None] | None:
        """Parse a tool line into ``(name, preview, args)``.

        Expands a terminal code block to its command, and a verbose header
        (``<emoji> <name>(keys)``) to its full args JSON (the JSON sits on the
        following line). ``args`` is ``None`` unless the line is a verbose
        header with a parseable JSON body.
        """
        parsed = _parse_tool_line(line)
        if parsed is None:
            return None
        name, preview = parsed
        # Terminal code block: the command lives in the fenced lines that
        # follow the "<emoji> terminal" head line.
        if name == "terminal" and preview is None and "```" in content:
            cmd = _extract_code_block(content)
            if cmd:
                return name, cmd, None
        # Verbose mode: recover the full args from the following JSON line.
        args = _extract_verbose_args(line, content)
        if args is not None and preview is None:
            preview = _short_preview_from_args(args)
        return name, preview, args

    async def _close_open_tool(
        self, chat_id: str, state: _TurnState, thread_id: str | None
    ) -> None:
        """Emit ``tool.end`` for the currently-open tool, if any.

        A tool is considered complete when the next tool starts OR a new
        content segment begins (the model only produces content after the
        tool it was waiting on has returned).
        """
        if state.open_tool_index is not None:
            extra = _tool_end_fields(state.open_tool_name or "")
            await self._broadcast_or_log(
                chat_id,
                protocol.tool_end(
                    chat_id,
                    state.open_tool_index,
                    state.open_tool_name or "",
                    ok=extra.get("ok", True),
                    duration=extra.get("duration"),
                    output_preview=extra.get("output_preview"),
                    thread_id=thread_id,
                ),
            )
            state.open_tool_index = None
            state.open_tool_name = None

    def _reset_tool_state(self, state: _TurnState) -> None:
        """Clear per-turn tool bookkeeping (called at turn finalization)."""
        state.tool_msg_id = None
        state.seen_tool_lines = set()
        state.tool_index = 0
        state.open_tool_index = None
        state.open_tool_name = None
        # Drop any captured tool results not consumed by a tool.end this turn
        # (e.g. tool_progress off) so they can't leak into the next turn.
        _reset_tool_results()