from __future__ import annotations

import argparse
import os
import sqlite3
from pathlib import Path

from .briefs import build_daily_brief, show_brief
from .db import connect, init_db
from .feeds import poll_all_sources, poll_source
from .llm import LocalModelClient, classify_articles
from .scoring import score_article
from .sources import load_sources, upsert_sources


ROOT = Path(__file__).resolve().parents[1]
DEFAULT_DB = ROOT / "data" / "goodnews.sqlite3"
DEFAULT_SOURCES = ROOT / "config" / "sources.toml"


def main() -> None:
    parser = argparse.ArgumentParser(prog="goodnews")
    parser.add_argument("--db", type=Path, default=DEFAULT_DB, help="SQLite database path")
    subparsers = parser.add_subparsers(dest="command", required=True)

    subparsers.add_parser("init-db", help="Create or update the SQLite schema")

    import_parser = subparsers.add_parser("import-sources", help="Load sources from TOML")
    import_parser.add_argument("--sources", type=Path, default=DEFAULT_SOURCES)

    poll_parser = subparsers.add_parser("poll", help="Poll active RSS/Atom sources")
    poll_parser.add_argument("--source", help="Poll one source by exact name")
    poll_parser.add_argument("--limit", type=int, help="Poll only the first N active sources")

    list_parser = subparsers.add_parser("list-recent", help="Show recently discovered articles")
    list_parser.add_argument("--limit", type=int, default=20)
    list_parser.add_argument("--accepted-only", action="store_true")

    source_parser = subparsers.add_parser("list-sources", help="Show configured sources")
    source_parser.add_argument("--active-only", action="store_true")

    cat_parser = subparsers.add_parser("list-category", help="Browse articles by topic and/or flavor")
    cat_parser.add_argument("--topic", help="Filter by topic, e.g. science, environment, animals")
    cat_parser.add_argument("--flavor", help="Filter by flavor, e.g. breakthrough, discovery, feelgood")
    cat_parser.add_argument("--limit", type=int, default=20)
    cat_parser.add_argument("--all", action="store_true", help="Include not-accepted articles")

    subparsers.add_parser("source-report", help="Show source-level ingestion and scoring stats")

    runs_parser = subparsers.add_parser("list-runs", help="Show recent ingest runs")
    runs_parser.add_argument("--limit", type=int, default=20)

    subparsers.add_parser("rescore", help="Re-run heuristic scores for stored articles")

    classify_parser = subparsers.add_parser("classify", help="Classify candidates with a local LLM")
    classify_parser.add_argument("--limit", type=int, default=10)
    classify_parser.add_argument("--include-rejected", action="store_true")
    classify_parser.add_argument("--dry-run", action="store_true")
    classify_parser.add_argument("--base-url", help="OpenAI-compatible base URL, e.g. http://127.0.0.1:1234/v1")
    classify_parser.add_argument("--model", help="Local model name")

    check_llm_parser = subparsers.add_parser("check-llm", help="Check local OpenAI-compatible model endpoint")
    check_llm_parser.add_argument("--base-url", help="OpenAI-compatible base URL, e.g. http://127.0.0.1:1234/v1")
    check_llm_parser.add_argument("--model", help="Expected local model name")

    brief_parser = subparsers.add_parser("build-brief", help="Build/freeze a daily brief")
    brief_parser.add_argument("--date", help="Brief date in YYYY-MM-DD format; defaults to today")
    brief_parser.add_argument("--limit", type=int, default=5)
    brief_parser.add_argument("--replace", action="store_true")

    show_brief_parser = subparsers.add_parser("show-brief", help="Show a stored daily brief")
    show_brief_parser.add_argument("--date", help="Brief date in YYYY-MM-DD format; defaults to latest brief")
    show_brief_parser.add_argument("--limit", type=int, default=10)

    serve_parser = subparsers.add_parser("serve", help="Run the web/API server (requires the 'web' extra)")
    serve_parser.add_argument("--host", default="127.0.0.1", help="Bind host; use 0.0.0.0 to expose")
    serve_parser.add_argument("--port", type=int, default=8000)
    serve_parser.add_argument("--reload", action="store_true", help="Auto-reload on code changes (dev)")

    args = parser.parse_args()

    if args.command == "serve":
        serve(args)
        return

    conn = connect(args.db)

    if args.command == "init-db":
        init_db(conn)
        print(f"Initialized {args.db}")
    elif args.command == "import-sources":
        init_db(conn)
        sources = load_sources(args.sources)
        count = upsert_sources(conn, sources)
        print(f"Imported {count} sources from {args.sources}")
    elif args.command == "poll":
        init_db(conn)
        if args.source:
            source = conn.execute("SELECT * FROM sources WHERE name = ?", (args.source,)).fetchone()
            if not source:
                raise SystemExit(f"No source named {args.source!r}")
            result = poll_source(conn, source)
        else:
            result = poll_all_sources(conn, limit=args.limit)
        print(_format_result(result))
    elif args.command == "list-recent":
        list_recent(conn, limit=args.limit, accepted_only=args.accepted_only)
    elif args.command == "list-sources":
        list_sources(conn, active_only=args.active_only)
    elif args.command == "list-category":
        list_category(conn, topic=args.topic, flavor=args.flavor, limit=args.limit, accepted_only=not args.all)
    elif args.command == "source-report":
        source_report(conn)
    elif args.command == "list-runs":
        list_runs(conn, limit=args.limit)
    elif args.command == "rescore":
        count = rescore_articles(conn)
        print(f"Rescored {count} articles")
    elif args.command == "classify":
        init_db(conn)
        client = llm_client_from_args(args)
        results = classify_articles(
            conn,
            client,
            limit=args.limit,
            include_rejected=args.include_rejected,
            dry_run=args.dry_run,
        )
        for article_id, scores in results:
            accepted = "yes" if scores["accepted"] else "no"
            print(
                f"[{article_id}] accepted={accepted} {scores['topic']}/{scores['flavor']} "
                f"reason={scores['reason_code']}"
            )
            print(f"  {scores['reason_text']}")
        if args.dry_run:
            print("Dry run only; database was not updated.")
    elif args.command == "check-llm":
        client = llm_client_from_args(args)
        try:
            models = client.list_models()
        except RuntimeError as exc:
            raise SystemExit(str(exc))
        print(f"Connected to {client.base_url}")
        if models:
            print("Models:")
            for model in models:
                marker = " *" if model == client.model else ""
                print(f"  {model}{marker}")
        else:
            print("Endpoint responded, but no models were listed.")
    elif args.command == "build-brief":
        init_db(conn)
        brief_id = build_daily_brief(
            conn,
            brief_date=args.date,
            limit=args.limit,
            replace=args.replace,
        )
        print(f"Built brief {brief_id}")
        print_brief(show_brief(conn, brief_date=args.date, limit=args.limit))
    elif args.command == "show-brief":
        print_brief(show_brief(conn, brief_date=args.date, limit=args.limit))


def list_recent(conn: sqlite3.Connection, limit: int, accepted_only: bool) -> None:
    where = "WHERE s.accepted = 1" if accepted_only else ""
    rows = conn.execute(
        f"""
        SELECT
            a.id,
            a.published_at,
            src.name AS source_name,
            a.title,
            a.canonical_url,
            s.accepted,
            s.constructive_score,
            s.cortisol_score,
            s.ragebait_score,
            s.reason_code
        FROM articles a
        JOIN sources src ON src.id = a.source_id
        LEFT JOIN article_scores s ON s.article_id = a.id
        {where}
        ORDER BY COALESCE(a.published_at, a.discovered_at) DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()
    for row in rows:
        accepted = "yes" if row["accepted"] else "no"
        print(f"[{row['id']}] {row['published_at'] or 'no date'} | {row['source_name']} | accepted={accepted}")
        print(f"  {row['title']}")
        print(
            "  scores: "
            f"constructive={row['constructive_score']} "
            f"cortisol={row['cortisol_score']} "
            f"ragebait={row['ragebait_score']} "
            f"reason={row['reason_code']}"
        )
        print(f"  {row['canonical_url']}")


def serve(args: argparse.Namespace) -> None:
    try:
        import uvicorn
    except ModuleNotFoundError:
        raise SystemExit(
            "The web server needs the optional 'web' extra. Install it with:\n"
            "  pip install -e '.[web]'"
        )
    # Make sure the API reads the same database the CLI was pointed at.
    os.environ.setdefault("GOODNEWS_DB", str(args.db))
    print(f"Serving goodNews on http://{args.host}:{args.port}  (docs at /docs)")
    uvicorn.run("goodnews.api:app", host=args.host, port=args.port, reload=args.reload)


def list_category(
    conn: sqlite3.Connection,
    topic: str | None,
    flavor: str | None,
    limit: int,
    accepted_only: bool,
) -> None:
    clauses = []
    params: list = []
    if accepted_only:
        clauses.append("s.accepted = 1")
    if topic:
        clauses.append("s.topic = ?")
        params.append(topic.lower())
    if flavor:
        clauses.append("s.flavor = ?")
        params.append(flavor.lower())
    where = ("WHERE " + " AND ".join(clauses)) if clauses else ""
    params.append(limit)

    rows = conn.execute(
        f"""
        SELECT
            a.id, a.title, a.canonical_url, a.published_at,
            src.name AS source_name,
            s.topic, s.flavor, s.accepted,
            s.constructive_score, s.cortisol_score, s.reason_code,
            (s.constructive_score + s.agency_score + s.human_benefit_score + src.trust_score
             - s.cortisol_score - s.ragebait_score - s.pr_risk_score) AS rank_score
        FROM articles a
        JOIN sources src ON src.id = a.source_id
        JOIN article_scores s ON s.article_id = a.id
        {where}
        ORDER BY rank_score DESC, COALESCE(a.published_at, a.discovered_at) DESC
        LIMIT ?
        """,
        params,
    ).fetchall()

    label = " / ".join(filter(None, [topic, flavor])) or "all categories"
    print(f"{label} ({len(rows)} shown)")
    for row in rows:
        accepted = "" if row["accepted"] else " [not accepted]"
        print(f"[{row['id']}] {row['topic']}/{row['flavor']} | {row['source_name']}{accepted}")
        print(f"  {row['title']}")
        print(f"  score={row['rank_score']} reason={row['reason_code']}")
        print(f"  {row['canonical_url']}")


def llm_client_from_args(args: argparse.Namespace) -> LocalModelClient:
    client = LocalModelClient.from_env()
    if getattr(args, "base_url", None):
        client.base_url = args.base_url.rstrip("/")
    if getattr(args, "model", None):
        client.model = args.model
    return client


def list_sources(conn: sqlite3.Connection, active_only: bool) -> None:
    where = "WHERE active = 1" if active_only else ""
    rows = conn.execute(
        f"""
        SELECT id, name, active, default_category, trust_score, pr_risk_score, feed_url
        FROM sources
        {where}
        ORDER BY name
        """
    ).fetchall()
    for row in rows:
        state = "active" if row["active"] else "inactive"
        print(
            f"[{row['id']}] {row['name']} ({state}, {row['default_category']}, "
            f"trust={row['trust_score']}, pr={row['pr_risk_score']})"
        )
        print(f"  {row['feed_url']}")


def source_report(conn: sqlite3.Connection) -> None:
    rows = conn.execute(
        """
        SELECT
            src.name,
            src.default_category,
            src.trust_score,
            src.pr_risk_score AS source_pr_risk,
            COUNT(a.id) AS articles,
            SUM(CASE WHEN s.accepted = 1 THEN 1 ELSE 0 END) AS accepted,
            ROUND(AVG(s.constructive_score), 1) AS avg_constructive,
            ROUND(AVG(s.cortisol_score), 1) AS avg_cortisol,
            ROUND(AVG(s.ragebait_score), 1) AS avg_ragebait,
            MAX(a.published_at) AS newest_article
        FROM sources src
        LEFT JOIN articles a ON a.source_id = src.id
        LEFT JOIN article_scores s ON s.article_id = a.id
        GROUP BY src.id
        ORDER BY accepted DESC, articles DESC, src.name
        """
    ).fetchall()
    for row in rows:
        articles = row["articles"] or 0
        accepted = row["accepted"] or 0
        rate = (accepted / articles * 100) if articles else 0
        print(
            f"{row['name']} | {row['default_category']} | "
            f"articles={articles} accepted={accepted} ({rate:.1f}%)"
        )
        print(
            f"  trust={row['trust_score']} pr={row['source_pr_risk']} "
            f"avg_constructive={row['avg_constructive']} "
            f"avg_cortisol={row['avg_cortisol']} "
            f"avg_ragebait={row['avg_ragebait']}"
        )
        print(f"  newest={row['newest_article'] or 'none'}")


def list_runs(conn: sqlite3.Connection, limit: int) -> None:
    rows = conn.execute(
        """
        SELECT r.id, r.started_at, r.finished_at, r.status, src.name AS source_name,
               r.items_seen, r.items_inserted, r.items_duplicate, r.error
        FROM ingest_runs r
        LEFT JOIN sources src ON src.id = r.source_id
        ORDER BY r.id DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()
    for row in rows:
        print(
            f"[{row['id']}] {row['status']} | {row['source_name'] or 'unknown'} | "
            f"seen={row['items_seen']} inserted={row['items_inserted']} duplicate={row['items_duplicate']}"
        )
        if row["error"]:
            print(f"  error: {row['error']}")


def rescore_articles(conn: sqlite3.Connection) -> int:
    rows = conn.execute(
        """
        SELECT a.id, a.title, a.description, src.pr_risk_score
        FROM articles a
        JOIN sources src ON src.id = a.source_id
        ORDER BY a.id
        """
    ).fetchall()
    for row in rows:
        scores = score_article(row["title"], row["description"], int(row["pr_risk_score"]))
        conn.execute(
            """
            INSERT INTO article_scores (
                article_id, constructive_score, cortisol_score, ragebait_score,
                agency_score, human_benefit_score, novelty_score, pr_risk_score,
                accepted, reason_code, reason_text, model_name, scored_at
            )
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP)
            ON CONFLICT(article_id) DO UPDATE SET
                constructive_score = excluded.constructive_score,
                cortisol_score = excluded.cortisol_score,
                ragebait_score = excluded.ragebait_score,
                agency_score = excluded.agency_score,
                human_benefit_score = excluded.human_benefit_score,
                novelty_score = excluded.novelty_score,
                pr_risk_score = excluded.pr_risk_score,
                accepted = excluded.accepted,
                reason_code = excluded.reason_code,
                reason_text = excluded.reason_text,
                model_name = excluded.model_name,
                scored_at = CURRENT_TIMESTAMP
            """,
            (
                row["id"],
                scores["constructive_score"],
                scores["cortisol_score"],
                scores["ragebait_score"],
                scores["agency_score"],
                scores["human_benefit_score"],
                scores["novelty_score"],
                scores["pr_risk_score"],
                scores["accepted"],
                scores["reason_code"],
                scores["reason_text"],
                scores["model_name"],
            ),
        )
    conn.commit()
    return len(rows)


def print_brief(rows: list[sqlite3.Row]) -> None:
    if not rows:
        print("No brief items found.")
        return
    date = rows[0]["brief_date"]
    print(f"Five Good Things Today - {date}")
    for row in rows:
        print(f"{row['rank']}. {row['title']}")
        print(f"   {row['source_name']} | {row['default_category']} | {row['model_name']}")
        print(f"   reason: {row['reason_code']}")
        print(f"   {row['canonical_url']}")


def _format_result(result: dict) -> str:
    if "sources" in result:
        return (
            f"Polled {result['sources']} sources: seen={result['seen']} "
            f"inserted={result['inserted']} duplicate={result['duplicate']} failed={result['failed']}"
        )
    if result.get("status") == "failed":
        return (
            f"Poll failed: seen={result['seen']} inserted={result['inserted']} "
            f"duplicate={result['duplicate']} error={result['error']}"
        )
    return (
        f"Poll ok: seen={result['seen']} inserted={result['inserted']} "
        f"duplicate={result['duplicate']}"
    )


if __name__ == "__main__":
    main()