#!/usr/bin/env python3
"""echo_ops.py — high-level ECHO operations layered on the client + index + links.

  resolve  — map a mention to its canonical note path (or where to create it)
  recall   — search, then expand one hop along links/source_notes for connected context
  link     — create bidirectional `## Related` links between two notes
  capture  — one-call write: route + canonical frontmatter + index + auto-link + agent-log

Network goes through echo.py; routing/aliases through echo_index; links through echo_links.
"""

from __future__ import annotations

import json
import re
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))
import echo          # noqa: E402
import echo_index as idx_mod   # noqa: E402
import echo_links as links     # noqa: E402

# Existing-entity capture appends a dated bullet under this per-kind heading.
LOG_HEADING = {
    "project": "Session History", "person": "Log", "company": "Log",
    "semantic": "Observations", "area": "Log", "concept": "Notes",
    "reference": "Notes", "meeting": "Notes", "decision": "Notes",
    "skill": "Notes", "episodic": "Notes", "working": "Notes",
}


# ---------------------------------------------------------------- resolve -----
def resolve(mention: str) -> int:
    index = idx_mod.load()
    slug, e = idx_mod.resolve(index, mention)
    if e:
        print(json.dumps({"match": True, "slug": slug, **e}, ensure_ascii=False, indent=2))
    else:
        print(json.dumps({"match": False, "mention": mention,
                          "suggest_slug": idx_mod.slugify(mention),
                          "note": "no index entry — derive a path with the right --kind and create it"},
                         ensure_ascii=False, indent=2))
    return 0


# ------------------------------------------------------------------- link -----
def link(a_path: str, b_path: str) -> int:
    a_changed, b_changed = links.link_bidirectional(a_path, b_path)
    print(f"ok: linked {a_path} <-> {b_path} "
          f"(added: {'A' if a_changed else '-'}{'B' if b_changed else '-'})")
    return 0


# ----------------------------------------------------------------- recall -----
def recall(query, limit: int = 8) -> int:
    """Hybrid lexical (BM25) + graph recall — implemented in echo_recall. Kept here as
    the stable public entrypoint (echo.py and /echo-recall call echo_ops.recall)."""
    import echo_recall  # lazy: only pulls the BM25 modules when recall is actually run
    return echo_recall.recall(query, limit=limit)


# ----------------------------------------------------------- agent log -------
def ensure_daily_log(line: str) -> None:
    """Resilient: ensure today's daily note + its `## Agent Log` heading exist, then
    idempotently append the line. Best-effort — never raises into the caller."""
    try:
        date = echo.today()
        path = f"journal/daily/{date}.md"
        status, body = echo.request("GET", echo.vault_url(path))
        if status == 404:
            ts, tb = echo.request("GET", echo.vault_url("journal/templates/daily-note-template.md"))
            tmpl = tb.decode(errors="replace") if ts == 200 else f"# {date}\n\n## Agent Log\n\n## Related\n"
            tmpl = tmpl.replace("{{date:YYYY-MM-DD}}", date).replace("{{DATE}}", date)
            echo.request("PUT", echo.vault_url(path), data=tmpl.encode(),
                         headers={"Content-Type": "text/markdown"})
            text = tmpl
        else:
            text = body.decode(errors="replace")
        if not re.search(r"(?m)^## Agent Log\s*$", text):
            echo.request("POST", echo.vault_url(path), data=b"\n\n## Agent Log\n",
                         headers={"Content-Type": "text/markdown"})
        status, body = echo.request("GET", echo.vault_url(path))
        if status == 200 and line in body.decode(errors="replace"):
            return
        echo.request("PATCH", echo.vault_url(path),
                     data=echo.normalize_patch_body((line + "\n").encode(), "append", "heading"),
                     headers={"Operation": "append", "Target-Type": "heading",
                              "Target": f"{date}::Agent Log", "Content-Type": "text/markdown"})
    except Exception as exc:
        print(f"echo_ops: agent-log skipped ({exc})", file=sys.stderr)


# ----------------------------------------------------------------- capture ---
def _build_note(fm_type: str, status_v: str, today_s: str, title: str,
                body_text: str, sources: list[str]) -> str:
    src = "[" + ", ".join(json.dumps(s) for s in sources) + "]"
    fm = ["---", f"type: {fm_type}"]
    if status_v:
        fm.append(f"status: {status_v}")
    fm += [f"created: {today_s}", f"updated: {today_s}", "tags: []",
           "agent_written: true", f"source_notes: {src}", "---", "", f"# {title}", ""]
    out = "\n".join(fm)
    if body_text.strip():
        out += body_text.strip() + "\n"
    out += "\n## Related\n"
    return out


def _append_to_existing(path: str, kind: str, today_s: str, body_text: str) -> None:
    text = links.get_text(path) or ""
    h1 = links.first_h1(text) or path.rsplit("/", 1)[-1][:-3]
    heading = LOG_HEADING.get(kind, "Notes")
    if not re.search(rf"(?m)^##\s+{re.escape(heading)}\s*$", text):
        echo.request("POST", echo.vault_url(path), data=f"\n\n## {heading}\n".encode(),
                     headers={"Content-Type": "text/markdown"})
    firstline = body_text.strip().splitlines()[0] if body_text.strip() else "(update)"
    bullet = f"- {today_s}: {firstline}"
    status, body = echo.request("GET", echo.vault_url(path))
    if status == 200 and bullet in body.decode(errors="replace"):
        return
    echo.request("PATCH", echo.vault_url(path),
                 data=echo.normalize_patch_body((bullet + "\n").encode(), "append", "heading"),
                 headers={"Operation": "append", "Target-Type": "heading",
                          "Target": f"{h1}::{heading}", "Content-Type": "text/markdown"})
    echo.cmd_fm(path, "updated", json.dumps(today_s))


def capture(kind: str | None, title: str, file_arg: str | None, status_v: str = "",
            aliases=None, sources=None, date: str | None = None, domain: str = "business",
            inbox: bool = False, no_log: bool = False, as_json: bool = False,
            dry_run: bool = False) -> int:
    import contextlib
    import io
    import echo_output
    import echo_quality

    real_stdout = sys.stdout

    def quiet():
        # M4: in --json mode, swallow the helper "ok:" chatter so stdout is clean JSON.
        return contextlib.redirect_stdout(io.StringIO()) if as_json else contextlib.nullcontext()

    def done(action: str, path: str, links: int = 0, ok: bool = True, dry: bool = False) -> int:
        if as_json:
            act = f"dry-run:{action}" if dry else action
            env = echo_output.envelope(act, {"kind": kind, "path": path, "title": title,
                                             "links_added": links}, ok=ok)
            print(json.dumps(env, ensure_ascii=False), file=real_stdout)
        elif dry:
            print(f"would {action} {kind or '-'} -> {path}")
        # non-dry human output is the helper "ok:" lines + the summary printed by the caller.
        return 0 if ok else 1

    body_text = echo.read_body(file_arg).decode("utf-8", errors="replace")
    today_s = echo.today()
    aliases = [a.strip() for a in (aliases or []) if a.strip()]
    sources = [s.strip() for s in (sources or []) if s.strip()]

    # Unknown home -> defer to the inbox (a single idempotent capture line).
    if inbox or not kind:
        if dry_run:
            return done("inbox", "inbox/captures/inbox.md", dry=True)
        line = f"- {today_s}: {title}"
        if body_text.strip():
            line += f" — {body_text.strip().splitlines()[0]}"
        with quiet():
            rc = echo.cmd_append("inbox/captures/inbox.md", line)
        return done("inbox", "inbox/captures/inbox.md", ok=rc == 0)

    slug = idx_mod.slugify(title)
    index = idx_mod.load()
    _, existing = idx_mod.resolve(index, title)
    existing_reachable = bool(existing and echo.request("GET", echo.vault_url(existing["path"]))[0] == 200)

    if dry_run:
        if existing_reachable:
            return done("update", existing["path"], dry=True)
        s2 = echo_quality.safe_slug(set(index.get("entities", {}).keys()), slug)
        return done("create", idx_mod.derive_path(kind, s2, date=date, domain=domain), dry=True)

    with quiet():
        if existing_reachable:
            path = existing["path"]
            kind = existing.get("kind", kind)
            _append_to_existing(path, kind, today_s, body_text)
            action = "updated"
        else:
            if not status_v and kind == "project":
                status_v = "active"
            # M2: don't let a 40-char-truncated slug silently collide with a different
            # entity already in the index — disambiguate to slug-2, slug-3, ...
            slug = echo_quality.safe_slug(set(index.get("entities", {}).keys()), slug)
            path = idx_mod.derive_path(kind, slug, date=date, domain=domain)
            note = _build_note(idx_mod.KIND_TYPE.get(kind, kind), status_v, today_s, title, body_text, sources)
            echo.cmd_put(path, echo.temp_file(note.encode()))
            action = "created"

        # H3: the entity-index write is the race the review flagged — a bare load->save lets
        # two concurrent captures clobber each other's entry. Route it through a lock-guarded,
        # fresh-re-read transaction. Returns the fresh index (used by auto-link below).
        import echo_concurrency
        index = echo_concurrency.atomic_index_update(
            lambda idx: idx_mod.upsert(idx, slug, path, kind, title, aliases))

        # auto-link: any other known entity CONFIDENTLY named in the body (M2: is_confident_link
        # rejects short/common tokens so a 3-char alias or a word like "API" can't link everywhere).
        linked = 0
        for s2, e2 in index.get("entities", {}).items():
            if e2.get("path") in (None, path):
                continue
            names = [n for n in [e2.get("title", ""), s2, *e2.get("aliases", [])] if n]
            if any(echo_quality.is_confident_link(n, body_text) for n in names):
                ca, cb = links.link_bidirectional(path, e2["path"])
                linked += int(ca or cb)

        # Keep the BM25 recall index current for this note (best-effort; lock-guarded inside
        # update_note, so it can't clobber a concurrent writer either).
        try:
            import echo_recall
            echo_recall.update_note(path, links.get_text(path) or "")
        except Exception as exc:  # never let recall-index upkeep fail a capture
            print(f"echo_ops: recall-index update skipped ({exc})", file=sys.stderr)

        if not no_log:
            ensure_daily_log(f"- {today_s}: {action} {kind} [[{links.link_token(path)}]]")

    if as_json:
        done(action, path, links=linked)
    else:
        print(f"ok: {action} {kind} -> {path}" + (f"; auto-linked {linked}" if linked else ""))
    return 0