"""v1.1 release Gate 9: a real v1.0.0 campaign, opened by the candidate.

    python -m tools.v11_upgrade_check --v100 <worktree> --out <dir under $HOME>

Run from `backend/`. Reads `AIDND_TEST_ENDPOINT`, `AIDND_TEST_MODEL` and
`AIDND_TEST_EMBED_MODEL`: the campaign has to be *played*, because memories,
summaries and narrative state are things a narrator produces. A schema-only
fixture would prove nothing about an upgrade, which is why §11 item 9 asks for a
database the v1.0.0 application built.

Three phases, each its own server process, so everything that survives crosses
as bytes on disk:

1. **v1.0.0 builds and plays.** The `432f041` tree serves the application: a
   campaign is created, canon knowledge imported, turns played, a Save Point
   taken, a turn undone so the head is not at the tip and Redo is available, and
   a narration length chosen. Then that server stops, and a census is taken.
2. **The candidate opens the same file.** Nothing is copied; the candidate's own
   migrations run against it. The census is taken again and compared field by
   field.
3. **Bundles cross both ways.** The v1.0.0 export is imported by the candidate.
   The candidate's export is offered back to v1.0.0, and whatever happens is
   reported — the format string is unchanged, which is a reason to test backward
   import, not a reason to assume it.

Settings hold only what the caller's environment names, and the evidence
directory lives under `$HOME`.

## Shapes this had to be written against, not guessed

- A turn is **SSE**: `POST /adventures/{id}/actions`, and a failed turn is an
  `error` *event* inside an HTTP 200. Reading the status code would call every
  failure a success.
- History is `GET /{id}/actions?limit=N` -> `{actions, total, has_more,
  can_undo, can_redo}`. There is **no head-id field**, so the active head is
  compared as the newest action plus the two flags.
- Save Points are **checkpoints**. Creating one after an Undo names the undone
  position, deliberately.
- There is **no summaries route**; summaries and post-turn health both come from
  `GET /{id}/derived`.
- Campaign switches are `PATCH /adventures/{id}` with `memory_bank_enabled` and
  `auto_summarize` — not the names a reader would guess.
- Knowledge import is **multipart**, as `m11_long_run` and `m11_offline` build it.
"""

from __future__ import annotations

import argparse
import json
import os
import shutil
import sqlite3
import subprocess
import sys
import time
import urllib.error
import urllib.request
from datetime import datetime
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from tools.m11_webdriver import free_port, require_under_home  # noqa: E402

ENDPOINT = os.environ.get("AIDND_TEST_ENDPOINT", "")
MODEL = os.environ.get("AIDND_TEST_MODEL", "")
EMBED_MODEL = os.environ.get("AIDND_TEST_EMBED_MODEL", "")
TURN_TIMEOUT = 900
#: What the evidence database is left holding. The campaign has to be played
#: against a real narrator, but nothing about the *upgrade* depends on which
#: host that was, and §11 item 9 asks for no real hostname in this database.
PLACEHOLDER_ENDPOINT = "http://127.0.0.1:11434/v1"

#: What the upgrade must preserve, compared exactly on both sides. `settings` is
#: included because a migration that silently rewrote an endpoint would be a real
#: defect; `schema_version` is read from the file rather than the API.
CENSUS = ("transcript", "newest_action", "total", "can_undo", "can_redo",
          "checkpoints", "state", "memories", "summaries", "knowledge",
          "narration_length", "memory_bank_enabled", "auto_summarize",
          "settings", "schema_version")

CANON_MD = """# Westhaven

The abbey bell is rung only for a death. Mara keeps the harbour ledger.
Aldric carries a silver key he will not explain.
"""


class App:
    """One application process, from whichever tree it is given."""

    def __init__(self, tree: Path, db: Path, log: Path, label: str):
        self.tree, self.db, self.label = tree, db, label
        self.port = free_port()
        self.log = log
        handle = open(log, "ab")
        self.proc = subprocess.Popen(
            [str(Path(__file__).resolve().parent.parent / ".venv/bin/uvicorn"),
             "app.main:app", "--host", "127.0.0.1", "--port", str(self.port)],
            cwd=str(tree / "backend"), stdout=handle, stderr=subprocess.STDOUT,
            env={**os.environ, "AIDND_DB_PATH": str(db),
                 "AIDND_DATABASE_URL": "", "DATABASE_URL": ""},
        )
        self.url = f"http://127.0.0.1:{self.port}"
        deadline = time.monotonic() + 120
        while time.monotonic() < deadline:
            if self.proc.poll() is not None:
                raise RuntimeError(f"{label} exited early; see {log}")
            try:
                urllib.request.urlopen(self.url + "/api/settings", timeout=2)
                print(f"  {label} serving {db.name} on {self.url}", flush=True)
                return
            except Exception:
                time.sleep(0.2)
        raise RuntimeError(f"{label} never became ready; see {log}")

    def call(self, method: str, path: str, payload=None, timeout=120):
        data = json.dumps(payload).encode() if payload is not None else None
        request = urllib.request.Request(
            f"{self.url}/api{path}", data=data, method=method,
            headers={"Content-Type": "application/json"} if data else {})
        with urllib.request.urlopen(request, timeout=timeout) as response:
            body = response.read().decode()
        return json.loads(body) if body else None

    def stream(self, path: str, payload) -> list[dict]:
        """A turn. A failed turn is an event in the stream, not a status code."""
        request = urllib.request.Request(
            f"{self.url}/api{path}", data=json.dumps(payload).encode(),
            method="POST", headers={"Content-Type": "application/json"})
        events: list[dict] = []
        with urllib.request.urlopen(request, timeout=TURN_TIMEOUT) as response:
            for raw in response:
                line = raw.decode(errors="replace").strip()
                if line.startswith("data:"):
                    try:
                        events.append(json.loads(line[5:].strip()))
                    except json.JSONDecodeError:
                        pass
        return events

    def upload(self, adv: int, name: str, body: str, classification: str) -> dict:
        boundary = "----v11upgrade"
        parts = (
            f"--{boundary}\r\nContent-Disposition: form-data; name=\"classification\""
            f"\r\n\r\n{classification}\r\n"
            f"--{boundary}\r\nContent-Disposition: form-data; name=\"file\"; "
            f"filename=\"{name}\"\r\nContent-Type: text/markdown\r\n\r\n{body}\r\n"
            f"--{boundary}--\r\n"
        ).encode()
        request = urllib.request.Request(
            f"{self.url}/api/adventures/{adv}/knowledge", data=parts, method="POST",
            headers={"Content-Type": f"multipart/form-data; boundary={boundary}"})
        with urllib.request.urlopen(request, timeout=120) as response:
            return json.loads(response.read().decode())

    def stop(self) -> None:
        if self.proc.poll() is None:
            self.proc.terminate()
            try:
                self.proc.wait(timeout=30)
            except subprocess.TimeoutExpired:
                self.proc.kill()


def schema_version(db: Path) -> int:
    connection = sqlite3.connect(f"file:{db}?mode=ro", uri=True)
    try:
        return connection.execute("PRAGMA user_version").fetchone()[0]
    finally:
        connection.close()


def census(app: App, adv: int, db: Path) -> dict:
    page = app.call("GET", f"/adventures/{adv}/actions?limit=500") or {}
    actions = page.get("actions") or []
    derived = app.call("GET", f"/adventures/{adv}/derived") or {}
    adventure = app.call("GET", f"/adventures/{adv}") or {}
    settings = app.call("GET", "/settings") or {}
    checkpoints = app.call("GET", f"/adventures/{adv}/checkpoints") or []
    memories = app.call("GET", f"/adventures/{adv}/memories") or []
    state = app.call("GET", f"/adventures/{adv}/state") or {}
    knowledge = app.call("GET", f"/adventures/{adv}/knowledge") or []
    newest = actions[-1] if actions else {}
    return {
        "transcript": [(a.get("type"), (a.get("text") or "")[:300]) for a in actions],
        # No head id is exposed; the head is the newest action on the read line
        # plus the two flags the page carries.
        "newest_action": ((newest.get("type"), (newest.get("text") or "")[:300])
                          if newest else None),
        "total": page.get("total"),
        "can_undo": page.get("can_undo"),
        "can_redo": page.get("can_redo"),
        "checkpoints": sorted((c.get("name"), c.get("depth"), c.get("branch_id"),
                               c.get("on_path"), c.get("resolved"))
                              for c in checkpoints),
        "state": state.get("document") if isinstance(state, dict) else state,
        "memories": sorted((m.get("text") or "")[:200] for m in memories),
        "summaries": sorted((s.get("text") or "")[:200]
                            for s in (derived.get("summaries") or [])),
        "knowledge": sorted((k.get("filename") or k.get("title"),
                             k.get("classification")) for k in knowledge),
        "narration_length": adventure.get("narration_length"),
        "memory_bank_enabled": adventure.get("memory_bank_enabled"),
        "auto_summarize": adventure.get("auto_summarize"),
        "settings": {k: settings.get(k)
                     for k in ("endpoint_url", "model", "max_output_tokens")},
        "schema_version": schema_version(db),
    }


def play(app: App, adv: int, text: str) -> bool:
    events = app.stream(f"/adventures/{adv}/actions", {"type": "do", "text": text})
    errors = [e for e in events if e.get("type") == "error"]
    if errors:
        print(f"    turn refused: {errors[0].get('detail', '')[:150]}", flush=True)
        return False
    return True


def build_v100_campaign(app: App) -> int:
    created = app.call("POST", "/adventures", {
        "title": "Upgrade Evidence",
        "opening": "Rain over Westhaven, and the abbey bell tolling.",
        "canon_rules": ["The dead do not return."],
        "persona_name": "Aldric",
    })
    adv = created["id"]
    app.call("PUT", "/settings", {
        "endpoint_url": ENDPOINT, "model": MODEL,
        "embedding_model": EMBED_MODEL,
        "max_output_tokens": 300, "model_timeout_seconds": TURN_TIMEOUT})
    # Memory and summaries are per-campaign switches defaulting to off, so the
    # census would otherwise have nothing to compare.
    app.call("PATCH", f"/adventures/{adv}", {
        "narration_length": "brief", "memory_bank_enabled": True,
        "auto_summarize": True})
    app.upload(adv, "westhaven-canon.md", CANON_MD, "canon")

    # Enough turns that memories and summaries actually exist. A memory needs
    # MEMORY_INTERVAL (6) actions plus SETTLE_SLACK (1) settled past the anchor,
    # and a summary needs SUMMARY_INTERVAL (15) uncovered actions — both counted
    # in *actions*, and a turn writes two. A first pass at this gate played five
    # turns, wrote neither, and compared 0 against 0, which proves nothing about
    # whether the upgrade preserves them.
    beats = [
        "I ask Mara what the bell means.",
        "I show her the silver key.",
        "I follow her to the harbour ledger.",
        "I ask who else knows about the key.",
        "I read the ledger's last page aloud.",
        "I ask the ferryman about the fen road.",
        "I wait out the rain and watch the harbour.",
        "I ask Mara about the abbey's sealed crypt.",
        "I count the entries against the tide table.",
        "I ask who signed for the last shipment.",
        "I walk the quay to the chandler's door.",
        "I ask the chandler what he remembers of that night.",
        "I show the chandler the key.",
        "I return to Mara with what he said.",
        "I ask Mara what she means to do now.",
        "I agree to meet her at first light.",
        "I take the long way back along the ridge.",
        "I check whether anyone followed me.",
        "I write down what I have learned so far.",
        "I sleep, and wake before the bell.",
    ]
    played = 0
    for text in beats:
        if play(app, adv, text):
            played += 1
    print(f"    {played} turns accepted by v1.0.0", flush=True)

    app.call("POST", f"/adventures/{adv}/checkpoints", {"name": "before the ledger"})
    # One Undo, so the head is not at the retained tip and Redo is available.
    app.call("POST", f"/adventures/{adv}/undo", {})

    # §11 item 9: the database must carry **loopback or placeholder settings with
    # no real hostnames**. The turns above needed a real narrator, so the
    # endpoint is reset to loopback once the story exists — before the census is
    # taken and before either bundle is exported.
    app.call("PUT", "/settings", {
        "endpoint_url": PLACEHOLDER_ENDPOINT, "model": MODEL,
        "embedding_model": EMBED_MODEL,
        "max_output_tokens": 300, "model_timeout_seconds": TURN_TIMEOUT})
    return adv


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--v100", required=True, help="the v1.0.0 worktree")
    parser.add_argument("--out", required=True)
    args = parser.parse_args()

    if not (ENDPOINT and MODEL and EMBED_MODEL):
        print("set AIDND_TEST_ENDPOINT, AIDND_TEST_MODEL and AIDND_TEST_EMBED_MODEL")
        return 2

    out = require_under_home(Path(args.out).expanduser())
    shutil.rmtree(out, ignore_errors=True)
    out.mkdir(parents=True)
    v100_tree = Path(args.v100).expanduser().resolve()
    candidate_tree = Path(__file__).resolve().parent.parent.parent
    db = out / "campaign.db"
    results: dict = {"started": datetime.now().isoformat(timespec="seconds"),
                     "v100_tree": str(v100_tree), "candidate": str(candidate_tree)}
    failures: list[str] = []

    print("phase 1 — v1.0.0 builds and plays the campaign")
    app = App(v100_tree, db, out / "v100-server.log", "v1.0.0")
    try:
        adv = build_v100_campaign(app)
        before = census(app, adv, db)
        v100_bundle = app.call("GET", f"/adventures/{adv}/export", timeout=600)
        (out / "v100-export.json").write_text(json.dumps(v100_bundle))
    finally:
        app.stop()
    results["adventure"], results["before"] = adv, before
    print(f"  {before['total']} actions, redo={before['can_redo']}, "
          f"checkpoints={len(before['checkpoints'])}, memories={len(before['memories'])}, "
          f"summaries={len(before['summaries'])}, knowledge={len(before['knowledge'])}, "
          f"schema={before['schema_version']}")

    print("\nphase 2 — the candidate opens that same database file")
    app = App(candidate_tree, db, out / "candidate-server.log", "candidate")
    try:
        after = census(app, adv, db)
        v11_bundle = app.call("GET", f"/adventures/{adv}/export", timeout=600)
        (out / "v11-export.json").write_text(json.dumps(v11_bundle))
        try:
            imported = app.call("POST", "/adventures/import", v100_bundle, timeout=600)
            results["v100_bundle_into_v11"] = {"status": "imported",
                                               "id": (imported or {}).get("id")}
            print("  the v1.0.0 bundle imported into the candidate")
        except urllib.error.HTTPError as exc:
            results["v100_bundle_into_v11"] = {
                "status": "refused", "code": exc.code,
                "detail": exc.read().decode()[:300]}
            failures.append("v100_bundle_into_v11")
            print(f"  the candidate REFUSED the v1.0.0 bundle: {exc.code}")
    finally:
        app.stop()
    results["after"] = after

    print("  comparing the census, field by field:")
    for field in CENSUS:
        same = before.get(field) == after.get(field)
        print(f"    {'ok  ' if same else 'DIFF'} {field}")
        if not same:
            failures.append(field)
            results.setdefault("differences", {})[field] = {
                "before": before.get(field), "after": after.get(field)}

    print("\nphase 3 — the candidate's bundle offered back to v1.0.0")
    app = App(v100_tree, out / "backward.db", out / "v100-backward.log", "v1.0.0")
    try:
        try:
            back = app.call("POST", "/adventures/import", v11_bundle, timeout=600)
            results["v11_bundle_into_v100"] = {"status": "imported",
                                               "id": (back or {}).get("id")}
            print("  v1.0.0 ACCEPTED the v1.1 bundle")
        except urllib.error.HTTPError as exc:
            detail = exc.read().decode()[:400]
            results["v11_bundle_into_v100"] = {"status": "refused", "code": exc.code,
                                               "detail": detail}
            # Reported, not failed: §11 item 9 asks for the result, and the
            # owner's brief asks whether a refusal breaks the compatibility
            # promise — a judgement, not an assertion this script may make.
            print(f"  v1.0.0 REFUSED the v1.1 bundle: {exc.code} {detail[:160]}")
    finally:
        app.stop()

    results["failures"] = failures
    (out / "upgrade-report.json").write_text(json.dumps(results, indent=2, default=str))
    print(f"\n{'PASS' if not failures else 'FAIL'}: {len(failures)} field(s) differ "
          f"-> {out / 'upgrade-report.json'}")
    return 1 if failures else 0


if __name__ == "__main__":
    raise SystemExit(main())