#!/usr/bin/env python3
"""odysseus-mail — Unix-style command-line wrapper around the email
backend that powers the web UI.

Calls the same helpers `routes/email_helpers.py` exports, so a request
issued from the shell hits IMAP/SMTP through the same connection pool
and the same parsing pipeline as the HTTP routes. State is shared via
`data/app.db` and `data/.app_key` (passwords decrypt automatically).

Output is JSON on stdout, errors on stderr, non-zero exit on failure.
Designed to compose:

    odysseus-mail list --folder INBOX --limit 5 \\
      | jq -r '.[] | .uid + "\\t" + .from_name + "\\t" + .subject'

    odysseus-mail send --to alice@example.com --subject hi <<<"hello"

    odysseus-mail folders --account work | jq

Subcommands:
    list       List recent messages in a folder
    read       Fetch one message by UID
    folders    Enumerate IMAP folders on the account
    accounts   List configured email accounts
    send       Send a message via SMTP (body from stdin)

Run with a subcommand + --help for argument details.
"""


from __future__ import annotations
import sys
import os, sys
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "_lib"))
from cli import quiet_logs, emit, fail, common_parser, run, REPO_ROOT as _REPO_ROOT
quiet_logs()


import argparse
import email as email_mod
import json
import logging
import os
import re
import sys
from datetime import datetime
from pathlib import Path

# Anchor the path so the script works when invoked from anywhere.
# The web-app logger is verbose at import time (cot_prompts, embeddings,
# etc.). For a CLI tool we only care about warnings+; users can re-raise
# with `LOG_LEVEL=DEBUG odysseus-mail ...`. We force the root level AFTER
# imports because some submodules call basicConfig themselves during
# initialization, which we have to override.
def quiet_logs() -> None:
    level_name = os.environ.get("LOG_LEVEL", "WARNING").upper()
    level = getattr(logging, level_name, logging.WARNING)
    root = logging.getLogger()
    root.setLevel(level)
    for handler in root.handlers:
        handler.setLevel(level)


# Suppress now so import-time `.info()` calls in helpers stay quiet.
quiet_logs()

# Defer the heavy imports until after path setup so a friendlier error
# message can be printed if the venv isn't activated.
try:
    from routes.email_helpers import (
        _imap, _get_email_config, _decode_header,
        _extract_text, _extract_html,
        _list_attachments_from_msg,
    )
    from routes.email_pollers import (
        _scheduled_poll_once, _run_auto_summarize_once,
    )
    from core.database import SessionLocal, EmailAccount
    # Re-apply: some submodules call basicConfig during their own
    # import, which raises root level back to INFO. Quench again.
    quiet_logs()
except ModuleNotFoundError as e:
    sys.stderr.write(
        f"error: {e}\n"
        f"hint: run from the repo root with the venv active:\n"
        f"      source venv/bin/activate && {sys.argv[0]} --help\n"
    )
    sys.exit(2)


def emit(obj, args) -> None:
    """Emit a JSON value on stdout. Pretty-print if requested or if
    stdout is a TTY."""
    pretty = getattr(args, "pretty", False) or sys.stdout.isatty()
    indent = 2 if pretty else None
    json.dump(obj, sys.stdout, indent=indent, default=str, ensure_ascii=False)
    sys.stdout.write("\n")


def fail(msg: str, code: int = 1) -> "None":
    sys.stderr.write(f"error: {msg}\n")
    sys.exit(code)


def _q(name: str) -> str:
    """Local copy of the IMAP mailbox quoter (matches email_helpers._q)."""
    return '"' + (name or "").replace("\\", "\\\\").replace('"', '\\"') + '"'


def _split_recipients(value: str) -> list[str]:
    return [r.strip() for r in (value or "").split(",") if r.strip()]


def _recipient_list(to: str, cc: str = "", bcc: str = "") -> list[str]:
    recipients = _split_recipients(to)
    recipients.extend(_split_recipients(cc))
    recipients.extend(_split_recipients(bcc))
    if not recipients:
        fail("at least one recipient is required")
    return recipients


# ─── list ────────────────────────────────────────────────────────────

def cmd_list(args) -> None:
    """List recent messages in a folder. Output: array of {uid, date,
    from_addr, from_name, subject, is_read, is_answered}."""
    with _imap(args.account) as conn:
        st, _ = conn.select(_q(args.folder), readonly=True)
        if st != "OK":
            fail(f"select {args.folder!r} failed: {st}")
        st, data = conn.search(None, "ALL")
        if st != "OK" or not data[0]:
            emit([], args)
            return
        all_uids = data[0].split()
        # Newest first, limit
        uids = list(reversed(all_uids))[: args.limit]
        out = []
        for uid in uids:
            try:
                st, msg_data = conn.fetch(uid, "(FLAGS RFC822.HEADER)")
                if st != "OK":
                    continue
                raw_header = None
                flags = ""
                for part in msg_data:
                    if isinstance(part, tuple):
                        meta = part[0].decode() if isinstance(part[0], bytes) else str(part[0])
                        if isinstance(part[0], bytes) and b"RFC822.HEADER" in part[0]:
                            raw_header = part[1]
                        elif "RFC822.HEADER" in meta:
                            raw_header = part[1]
                        m = re.search(r"FLAGS \(([^)]*)\)", meta)
                        if m:
                            flags = m.group(1)
                if not raw_header:
                    continue
                msg = email_mod.message_from_bytes(raw_header)
                subject = _decode_header(msg.get("Subject", "(no subject)"))
                sender = _decode_header(msg.get("From", "unknown"))
                from email.utils import parseaddr, parsedate_to_datetime
                sender_name, sender_addr = parseaddr(sender)
                date_raw = msg.get("Date", "")
                try:
                    iso = parsedate_to_datetime(date_raw).isoformat() if date_raw else ""
                except Exception:
                    iso = ""
                out.append({
                    "uid": uid.decode(),
                    "date": iso,
                    "from_addr": sender_addr,
                    "from_name": sender_name or sender_addr,
                    "subject": subject,
                    "is_read": "\\Seen" in flags,
                    "is_answered": "\\Answered" in flags,
                })
            except Exception as e:
                sys.stderr.write(f"warn: skipping uid {uid!r}: {e}\n")
        emit(out, args)


# ─── read ────────────────────────────────────────────────────────────

def cmd_read(args) -> None:
    """Fetch one message. Output: {uid, headers, body_text, body_html?,
    attachments}."""
    with _imap(args.account) as conn:
        st, _ = conn.select(_q(args.folder), readonly=True)
        if st != "OK":
            fail(f"select {args.folder!r} failed: {st}")
        st, msg_data = conn.fetch(args.uid.encode(), "(BODY.PEEK[])")
        if st != "OK" or not msg_data or not msg_data[0]:
            fail(f"fetch UID {args.uid} failed: {st}")
        raw = msg_data[0][1]
        msg = email_mod.message_from_bytes(raw)
        headers = {
            "from": _decode_header(msg.get("From", "")),
            "to": _decode_header(msg.get("To", "")),
            "cc": _decode_header(msg.get("Cc", "")),
            "subject": _decode_header(msg.get("Subject", "")),
            "date": msg.get("Date", ""),
            "message_id": msg.get("Message-ID", ""),
        }
        out = {
            "uid": args.uid,
            "headers": headers,
            "body_text": _extract_text(msg) or "",
            "attachments": _list_attachments_from_msg(msg),
        }
        if args.html:
            out["body_html"] = _extract_html(msg) or ""
        emit(out, args)


# ─── folders ─────────────────────────────────────────────────────────

def cmd_folders(args) -> None:
    """List IMAP folders on the account. Output: array of folder names."""
    with _imap(args.account) as conn:
        st, folders = conn.list()
        if st != "OK":
            fail("LIST failed")
        names = []
        for f in folders or []:
            decoded = f.decode() if isinstance(f, bytes) else str(f)
            m = re.search(r'"([^"]*)"\s*$|(\S+)\s*$', decoded)
            if m:
                names.append(m.group(1) or m.group(2))
        emit(names, args)


# ─── accounts ────────────────────────────────────────────────────────

def cmd_accounts(args) -> None:
    """List configured email accounts (passwords masked). Output: array
    of {id, name, is_default, enabled, imap_host, smtp_host, from_address}."""
    db = SessionLocal()
    try:
        rows = db.query(EmailAccount).order_by(
            EmailAccount.is_default.desc(),
            EmailAccount.created_at.asc(),
        ).all()
        out = [{
            "id": r.id,
            "name": r.name,
            "is_default": bool(r.is_default),
            "enabled": bool(r.enabled),
            "imap_host": r.imap_host or "",
            "imap_user": r.imap_user or "",
            "smtp_host": r.smtp_host or "",
            "smtp_user": r.smtp_user or "",
            "from_address": r.from_address or "",
            "has_password": bool(r.imap_password) or bool(r.smtp_password),
        } for r in rows]
        emit(out, args)
    finally:
        db.close()


# ─── poll-scheduled ──────────────────────────────────────────────────

def cmd_poll_scheduled(args) -> None:
    """One pass of the scheduled-email queue. Cron-friendly: idempotent,
    exits 0 on success even if zero rows were due. Output: {sent: [ids],
    failed: [{id, error}]}."""
    result = _scheduled_poll_once()
    emit(result, args)
    if result.get("failed"):
        sys.exit(1)


# ─── poll-summary ────────────────────────────────────────────────────

def cmd_poll_summary(args) -> None:
    """One pass of the auto-summarize / auto-reply pipeline over recent
    mail. Cron-friendly: a single shot you can wire to a systemd timer
    instead of running the FastAPI process all the time."""
    import asyncio
    msg = asyncio.run(_run_auto_summarize_once(
        do_summary=args.summary,
        do_reply=args.reply,
        do_tag=args.tag,
        do_spam=args.spam,
        days_back=args.days,
    ))
    emit({"message": msg or "(no output)"}, args)


# ─── send ────────────────────────────────────────────────────────────

def cmd_send(args) -> None:
    """Send a message via SMTP. Body is read from stdin."""
    import smtplib
    from email.mime.text import MIMEText
    from email.mime.multipart import MIMEMultipart

    body = sys.stdin.read()
    if not body and not args.allow_empty:
        fail("body is empty (pipe content into stdin, or pass --allow-empty)")

    cfg = _get_email_config(args.account)
    if not (cfg.get("smtp_host") and cfg.get("smtp_user") and cfg.get("smtp_password")):
        fail(
            f"SMTP not configured for account {cfg.get('account_name', '<default>')!r}; "
            f"check `odysseus-mail accounts` and the web settings"
        )

    outer = MIMEMultipart("alternative")
    outer["From"] = cfg["from_address"]
    outer["To"] = args.to
    if args.cc:
        outer["Cc"] = args.cc
    outer["Subject"] = args.subject
    outer["Date"] = datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S +0000")
    outer.attach(MIMEText(body, "plain", "utf-8"))

    recipients = _recipient_list(args.to, args.cc, args.bcc)

    if args.dry_run:
        emit({
            "dry_run": True,
            "from": cfg["from_address"],
            "recipients": recipients,
            "subject": args.subject,
            "bytes": len(outer.as_bytes()),
        }, args)
        return

    with smtplib.SMTP_SSL(cfg["smtp_host"], int(cfg["smtp_port"] or 465)) as smtp:
        smtp.login(cfg["smtp_user"], cfg["smtp_password"])
        smtp.sendmail(cfg["from_address"], recipients, outer.as_string())
    emit({"ok": True, "from": cfg["from_address"], "recipients": recipients}, args)


# ─── argparse wiring ─────────────────────────────────────────────────

def _build_parser() -> argparse.ArgumentParser:
    # Common flags shared by every subcommand. Using `parents=[common]`
    # lets `--account` / `--pretty` appear either before OR after the
    # subcommand name, which matches how most Unix CLIs work.
    common = argparse.ArgumentParser(add_help=False)
    common.add_argument("--account", help="Account ID (default: configured default)")
    common.add_argument("--pretty", action="store_true", help="Pretty-print JSON output")

    p = argparse.ArgumentParser(
        prog="odysseus-mail",
        description="Shell-friendly wrapper around the Odysseus email backend.",
        parents=[common],
    )
    sub = p.add_subparsers(dest="cmd", required=True)

    pl = sub.add_parser("list", help="list recent messages in a folder", parents=[common])
    pl.add_argument("--folder", default="INBOX")
    pl.add_argument("--limit", type=int, default=20)
    pl.set_defaults(func=cmd_list)

    pr = sub.add_parser("read", help="fetch one message by UID", parents=[common])
    pr.add_argument("uid")
    pr.add_argument("--folder", default="INBOX")
    pr.add_argument("--html", action="store_true", help="include HTML body in output")
    pr.set_defaults(func=cmd_read)

    pf = sub.add_parser("folders", help="list IMAP folders", parents=[common])
    pf.set_defaults(func=cmd_folders)

    pa = sub.add_parser("accounts", help="list configured email accounts", parents=[common])
    pa.set_defaults(func=cmd_accounts)

    ps = sub.add_parser("send", help="send a message (body from stdin)", parents=[common])
    ps.add_argument("--to", required=True)
    ps.add_argument("--subject", required=True)
    ps.add_argument("--cc", default="")
    ps.add_argument("--bcc", default="")
    ps.add_argument("--dry-run", action="store_true", help="don't actually send; print envelope")
    ps.add_argument("--allow-empty", action="store_true", help="permit empty body")
    ps.set_defaults(func=cmd_send)

    pps = sub.add_parser(
        "poll-scheduled",
        help="one pass of the scheduled-email queue (cron/systemd-friendly)",
        parents=[common],
    )
    pps.set_defaults(func=cmd_poll_scheduled)

    psm = sub.add_parser(
        "poll-summary",
        help="one pass of the AI auto-summarize / auto-reply pipeline",
        parents=[common],
    )
    psm.add_argument("--summary", action="store_true", default=True, help="run summarize step (default on)")
    psm.add_argument("--no-summary", dest="summary", action="store_false")
    psm.add_argument("--reply", action="store_true", default=True, help="run auto-reply step (default on)")
    psm.add_argument("--no-reply", dest="reply", action="store_false")
    psm.add_argument("--tag", action="store_true", default=False, help="also run AI tagging step")
    psm.add_argument("--spam", action="store_true", default=False, help="also run AI spam-classify step")
    psm.add_argument("--days", type=int, default=1, help="how far back to scan (default 1)")
    psm.set_defaults(func=cmd_poll_summary)

    return p


if __name__ == "__main__":
    sys.exit(run(_build_parser()))