"""Task intake from issue-core REST (activity-core emission sink).

Polls open issues labeled for the harness, maps them to TaskSpec, claims
them (in_progress + assignee), and after a successful run closes them.

Environment:

  ISSUE_CORE_URL       default http://127.0.0.1:8765
  ISSUE_CORE_API_KEY   required for live poll
  AGENT_HARNESS_INTAKE_LABELS   comma list; issue must have ALL (default: automated)
  AGENT_HARNESS_ASSIGNEE        claim assignee (default: agent-harness)
  AGENT_HARNESS_REPO_MAP        JSON object name→path, e.g. {"binky-control":"~/binky-control"}
  AGENT_HARNESS_REPO_ROOTS      colon-separated search roots (default: ~:~/work)

Local development still uses `agent-harness run --task-file …`.
"""

from __future__ import annotations

import json
import os
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any

import httpx

from agent_harness.taskspec import TaskSpec, TaskSpecError

DEFAULT_ISSUE_CORE_URL = "http://127.0.0.1:8765"
DEFAULT_INTAKE_LABELS = ("automated",)
DEFAULT_ASSIGNEE = "agent-harness"
DEFAULT_REPO_ROOTS = ("~", "~/work")

# activity-definition / label → (agent instance, completion_event_type)
_DEFINITION_HINTS: dict[str, tuple[str, str]] = {
    "binky-daily-rhythm": ("coach", "binky_daily_brief"),
    "binky-weekly-mail-intake": ("mail-triage", "binky_mail_intake"),
    "binky-weekly-review-prep": ("review-prep", "binky_weekly_review"),
    "daily_brief": ("coach", "binky_daily_brief"),
    "mail_intake": ("mail-triage", "binky_mail_intake"),
    "weekly_review": ("review-prep", "binky_weekly_review"),
    "rhythm": ("coach", "binky_daily_brief"),
    "mail-intake": ("mail-triage", "binky_mail_intake"),
    "weekly-review": ("review-prep", "binky_weekly_review"),
}


class IntakeError(RuntimeError):
    pass


@dataclass
class EmittedIssue:
    """Normalized issue-core issue for harness consumption."""

    issue_id: str
    title: str
    description: str
    labels: list[str] = field(default_factory=list)
    target_repo: str | None = None
    priority: str | None = None
    activity_definition_id: str | None = None
    source_id: str | None = None
    triggering_event_id: str | None = None
    state: str = "open"
    number: int = 0
    raw: dict[str, Any] = field(default_factory=dict)

    @classmethod
    def from_api(cls, data: dict[str, Any]) -> "EmittedIssue":
        return cls(
            issue_id=str(data.get("issue_id") or data.get("id") or ""),
            title=str(data.get("title") or ""),
            description=str(data.get("description") or ""),
            labels=[str(x) for x in (data.get("labels") or [])],
            target_repo=data.get("target_repo"),
            priority=data.get("priority"),
            activity_definition_id=data.get("activity_definition_id"),
            source_id=data.get("source_id"),
            triggering_event_id=data.get("triggering_event_id"),
            state=str(data.get("state") or "open"),
            number=int(data.get("number") or 0),
            raw=data,
        )


@dataclass
class IntakeConfig:
    base_url: str = DEFAULT_ISSUE_CORE_URL
    api_key: str = ""
    require_labels: tuple[str, ...] = DEFAULT_INTAKE_LABELS
    assignee: str = DEFAULT_ASSIGNEE
    repo_map: dict[str, str] = field(default_factory=dict)
    repo_roots: tuple[str, ...] = DEFAULT_REPO_ROOTS
    timeout: float = 15.0

    @classmethod
    def from_env(cls) -> "IntakeConfig":
        labels_raw = os.environ.get("AGENT_HARNESS_INTAKE_LABELS", "automated")
        labels = tuple(part.strip() for part in labels_raw.split(",") if part.strip())
        roots_raw = os.environ.get("AGENT_HARNESS_REPO_ROOTS", "~:~/work")
        roots = tuple(part.strip() for part in roots_raw.split(":") if part.strip())
        repo_map: dict[str, str] = {}
        map_raw = os.environ.get("AGENT_HARNESS_REPO_MAP", "").strip()
        if map_raw:
            repo_map = {str(k): str(v) for k, v in json.loads(map_raw).items()}
        return cls(
            base_url=os.environ.get("ISSUE_CORE_URL", DEFAULT_ISSUE_CORE_URL).rstrip("/"),
            api_key=os.environ.get("ISSUE_CORE_API_KEY", "").strip(),
            require_labels=labels or DEFAULT_INTAKE_LABELS,
            assignee=os.environ.get("AGENT_HARNESS_ASSIGNEE", DEFAULT_ASSIGNEE),
            repo_map=repo_map,
            repo_roots=roots or DEFAULT_REPO_ROOTS,
        )


class IssueCoreClient:
    """Thin REST client for issue-core poll/claim/close."""

    def __init__(self, config: IntakeConfig | None = None):
        self.config = config or IntakeConfig.from_env()

    def _headers(self) -> dict[str, str]:
        if not self.config.api_key:
            raise IntakeError(
                "ISSUE_CORE_API_KEY is not set (required to poll issue-core)"
            )
        return {
            "Authorization": f"Bearer {self.config.api_key}",
            "Accept": "application/json",
        }

    def list_open(
        self,
        *,
        labels: tuple[str, ...] | None = None,
        limit: int = 50,
    ) -> list[EmittedIssue]:
        want = labels if labels is not None else self.config.require_labels
        params: list[tuple[str, str]] = [("state", "open"), ("limit", str(limit))]
        for lab in want:
            params.append(("label", lab))
        try:
            resp = httpx.get(
                f"{self.config.base_url}/issues/",
                params=params,
                headers=self._headers(),
                timeout=self.config.timeout,
            )
            resp.raise_for_status()
        except httpx.HTTPError as exc:
            raise IntakeError(f"list issues failed: {exc}") from exc
        data = resp.json()
        if not isinstance(data, list):
            raise IntakeError(f"unexpected list payload type: {type(data)}")
        return [EmittedIssue.from_api(item) for item in data]

    def claim(self, issue_id: str) -> EmittedIssue:
        return self._patch(
            issue_id,
            {"state": "in_progress", "assignee": self.config.assignee},
        )

    def close(self, issue_id: str) -> EmittedIssue:
        return self._patch(issue_id, {"state": "closed"})

    def reopen(self, issue_id: str) -> EmittedIssue:
        return self._patch(issue_id, {"state": "open", "assignee": ""})

    def _patch(self, issue_id: str, body: dict[str, Any]) -> EmittedIssue:
        try:
            resp = httpx.patch(
                f"{self.config.base_url}/issues/{issue_id}",
                json=body,
                headers=self._headers(),
                timeout=self.config.timeout,
            )
            resp.raise_for_status()
        except httpx.HTTPError as exc:
            raise IntakeError(f"patch issue {issue_id} failed: {exc}") from exc
        return EmittedIssue.from_api(resp.json())


def resolve_target_repo(
    name: str,
    *,
    repo_map: dict[str, str] | None = None,
    repo_roots: tuple[str, ...] = DEFAULT_REPO_ROOTS,
) -> Path:
    """Map emission target_repo slug/path to a local git checkout."""
    raw = (name or "").strip()
    if not raw:
        raise TaskSpecError("target_repo is empty")

    # Absolute or explicit path
    direct = Path(raw).expanduser()
    if direct.is_dir() and (direct / ".git").is_dir():
        return direct.resolve()

    # Strip org prefix: coulomb/binky-control → binky-control
    slug = raw.split("/")[-1]

    mapping = repo_map or {}
    if slug in mapping:
        path = Path(mapping[slug]).expanduser()
        if (path / ".git").is_dir():
            return path.resolve()
        raise TaskSpecError(f"mapped target_repo not a git repo: {path}")
    if raw in mapping:
        path = Path(mapping[raw]).expanduser()
        if (path / ".git").is_dir():
            return path.resolve()

    for root in repo_roots:
        candidate = Path(root).expanduser() / slug
        if (candidate / ".git").is_dir():
            return candidate.resolve()

    raise TaskSpecError(
        f"cannot resolve target_repo '{name}' under {list(repo_roots)}; "
        "set AGENT_HARNESS_REPO_MAP or clone the repo"
    )


def infer_agent_and_event(issue: EmittedIssue) -> tuple[str, str]:
    """Return (agent_instance_name, completion_event_type)."""
    keys: list[str] = []
    if issue.activity_definition_id:
        keys.append(issue.activity_definition_id)
    keys.extend(issue.labels)
    blob = " ".join(keys).lower()
    for hint, mapped in _DEFINITION_HINTS.items():
        if hint.lower() in blob:
            return mapped
    # explicit agent:name label
    for lab in issue.labels:
        if lab.startswith("agent:"):
            return lab.split(":", 1)[1], "executor_run"
    return "coach", "executor_run"


def issue_to_taskspec(issue: EmittedIssue, config: IntakeConfig | None = None) -> TaskSpec:
    cfg = config or IntakeConfig.from_env()
    if not issue.target_repo:
        raise TaskSpecError(
            f"issue {issue.issue_id} missing target_repo (ingestion metadata)"
        )
    target = resolve_target_repo(
        issue.target_repo,
        repo_map=cfg.repo_map,
        repo_roots=cfg.repo_roots,
    )
    agent, event = infer_agent_and_event(issue)
    timeout = 900
    return TaskSpec(
        title=issue.title,
        description=issue.description,
        target_repo=target,
        agent=agent,
        labels=list(issue.labels),
        hub_task_id=None,
        completion_event_type=event,
        timeout_seconds=timeout,
    )


def poll_next(
    client: IssueCoreClient | None = None,
    *,
    claim: bool = True,
) -> tuple[EmittedIssue, TaskSpec] | None:
    """Poll one open harness-labeled issue; optionally claim it.

    Returns None when the queue is empty.
    """
    client = client or IssueCoreClient()
    issues = client.list_open()
    if not issues:
        return None
    # Prefer oldest by number when available
    issues_sorted = sorted(issues, key=lambda i: (i.number or 0, i.issue_id))
    issue = issues_sorted[0]
    if claim:
        issue = client.claim(issue.issue_id)
    spec = issue_to_taskspec(issue, client.config)
    return issue, spec