import copy
import json
import sqlite3

import pytest

from coordination_engine.adapters import AdapterError, SafetyError
from coordination_engine.config import Config
from coordination_engine.runtime import Runtime
from coordination_engine.store import Store


class FakeHub:
    def __init__(self):
        self.data = {
            "repos": {"r": "demo"},
            "plans": [{"id": "p", "repo_id": "r", "status": "active"}],
            "tasks": [
                {
                    "id": "t",
                    "workplan_id": "p",
                    "status": "todo",
                    "title": "Fix parser",
                    "updated_at": "1",
                }
            ],
            "dependencies": [],
            "messages": [],
        }
        self.receipts = []
        self.offline = False
        self.projection_offline = False

    def snapshot(self):
        if self.offline:
            raise OSError("offline")
        return copy.deepcopy(self.data)

    def project(self, receipt):
        if self.projection_offline:
            raise OSError("offline")
        self.receipts.append(receipt)


class FakeTamq:
    def __init__(self):
        self.calls = []
        self.messages = {}
        self.error = None
        self.state = "injected"

    def wake(self, lease, prompt):
        self.calls.append((lease, prompt))
        if self.error:
            raise self.error
        self.messages.setdefault(lease["lease_id"], str(len(self.messages)))
        return {
            "endpoint_id": "e",
            "message_id": self.messages[lease["lease_id"]],
            "transport_state": self.state,
        }

    def receipt(self, message_id):
        return {"state": self.state}


@pytest.fixture
def env(tmp_path):
    config = Config(state_dir=tmp_path / "state", repos=["demo"]).validate()
    store = Store(config)
    hub, tamq = FakeHub(), FakeTamq()
    clock = [100.0]
    runtime = Runtime(config, store, hub, tamq, lambda: clock[0])
    yield config, store, hub, tamq, clock, runtime
    store.close()


def test_dedupe_and_delivery_is_not_completion(env):
    _, store, hub, tamq, clock, runtime = env
    runtime.tick()
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 1
    assert store.leases()[0]["state"] == "offered"
    assert store.leases()[0]["transport_state"] == "injected"
    assert all("prompt" not in r and "checkpoint" not in r for r in hub.receipts)


@pytest.mark.parametrize(
    "field,value",
    [
        ("needs_human", True),
        ("intervention_note", "private review note"),
        ("title", "Get a secret"),
        ("action_classes", ["external_publish"]),
        ("blocking_reason", "operator decision"),
    ],
)
def test_safety_stops_never_retry(env, field, value):
    _, store, hub, tamq, clock, runtime = env
    hub.data["tasks"][0][field] = value
    for i in range(8):
        clock[0] += 300
        runtime.tick()
    assert not tamq.calls
    assert store.leases()[0]["state"] == "stopped"
    assert value not in json.dumps(hub.receipts) if isinstance(value, str) else True


def test_dependencies_change_without_task_revision(env):
    _, store, hub, tamq, clock, runtime = env
    hub.data["plans"].append({"id": "upstream", "repo_id": "other", "status": "active"})
    hub.data["dependencies"] = [
        {
            "id": "d",
            "from_workplan_id": "p",
            "to_workplan_id": "upstream",
            "relationship_type": "blocks",
        }
    ]
    runtime.tick()
    assert not tamq.calls
    assert store.leases()[0]["state"] == "waiting"
    hub.data["plans"][1]["status"] = "finished"
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 1


def test_unresolved_dependency_and_wait_task_do_not_dispatch(env):
    _, _, hub, tamq, _, runtime = env
    hub.data["tasks"][0]["status"] = "wait"
    runtime.tick()
    assert not tamq.calls


def test_incoming_dependency_does_not_block(env):
    _, _, hub, tamq, _, runtime = env
    hub.data["dependencies"] = [
        {
            "id": "d",
            "from_workplan_id": "other",
            "to_workplan_id": "p",
            "relationship_type": "blocks",
        }
    ]
    runtime.tick()
    assert len(tamq.calls) == 1


def test_retry_identity_and_exhaustion(env):
    config, store, _, tamq, clock, runtime = env
    tamq.error = AdapterError("offline")
    for i in range(7):
        clock[0] += 400
        runtime.tick()
    assert len(tamq.calls) == config.max_attempts
    assert len({row["lease_id"] for row, _ in tamq.calls}) == 1
    assert len({prompt for _, prompt in tamq.calls}) == 1
    assert store.leases()[0]["state"] == "stopped"


def test_crash_after_send_recovers_same_message(env):
    config, store, hub, tamq, clock, runtime = env
    runtime.tick()
    recovered = Runtime(config, store, hub, tamq, lambda: clock[0])
    clock[0] += 31
    recovered.tick()
    clock[0] += 15
    recovered.tick()
    assert len(tamq.calls) == 2
    assert len(tamq.messages) == 1


def test_worker_lifecycle_and_checkpoint_sanitization(env):
    _, store, hub, _, clock, runtime = env
    runtime.tick()
    row = store.leases()[0]
    with pytest.raises(ValueError):
        runtime.worker_update("renew", row["lease_id"], "demo")
    with pytest.raises(ValueError):
        runtime.worker_update("ack", row["lease_id"], "wrong")
    runtime.worker_update("ack", row["lease_id"], "demo")
    runtime.worker_update("renew", row["lease_id"], "demo")
    runtime.worker_update(
        "complete", row["lease_id"], "demo", {"summary": "private diagnostic detail"}
    )
    runtime.project()
    assert store.leases()[0]["state"] == "completed"
    assert "private diagnostic detail" not in json.dumps(hub.receipts)


def test_expired_worker_cannot_renew(env):
    _, store, _, _, clock, runtime = env
    runtime.tick()
    clock[0] += 31
    with pytest.raises(ValueError):
        runtime.worker_update("ack", store.leases()[0]["lease_id"], "demo")


def test_hub_outage_and_projection_recovery(env):
    _, store, hub, tamq, clock, runtime = env
    hub.projection_offline = True
    runtime.tick()
    assert store.pending_receipts()
    hub.offline = True
    clock[0] += 40
    runtime.tick()
    assert len(tamq.calls) == 1
    hub.offline = hub.projection_offline = False
    clock[0] += 300
    runtime.tick()
    assert not store.pending_receipts()


def test_one_active_worker_per_repo(env):
    _, store, hub, tamq, _, runtime = env
    hub.data["tasks"].append(dict(hub.data["tasks"][0], id="t2"))
    runtime.tick()
    assert len(tamq.calls) == 1
    assert [r["state"] for r in store.leases()] == ["offered", "pending"]


def test_explicit_action_message_only(env):
    _, _, hub, tamq, clock, runtime = env
    hub.data["tasks"] = []
    hub.data["messages"] = [
        {"id": "m", "to_agent": "demo", "subject": "FYI", "body": "ordinary text"}
    ]
    runtime.tick()
    assert not tamq.calls
    hub.data["messages"][0]["subject"] = "[action] Inspect work"
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 1
    assert "ordinary text" not in tamq.calls[0][1]


def test_adapter_safety_error_is_terminal(env):
    _, store, _, tamq, _, runtime = env
    tamq.error = SafetyError("ambiguous_endpoint")
    runtime.tick()
    assert store.leases()[0]["state"] == "stopped"


@pytest.mark.parametrize(
    "kwargs",
    [
        {"max_attempts": 10},
        {"max_attempts": True},
        {"timeout": float("nan")},
        {"retry_backoff": []},
        {"policy_profile": "unsafe"},
        {"api_base": "http://user:secret@localhost"},
        {"allow": ["secrets"]},
    ],
)
def test_invalid_config(kwargs):
    with pytest.raises(ValueError):
        Config(**kwargs).validate()


def test_backup_schema_and_exclusive_writer(env):
    config, store, _, _, _, _ = env
    backup = store.backup()
    assert backup.stat().st_mode & 0o777 == 0o600
    with sqlite3.connect(backup) as db:
        assert db.execute("PRAGMA user_version").fetchone()[0] == 1
    other = Store(config)
    try:
        with store.writer_lock():
            with pytest.raises(BlockingIOError):
                with other.writer_lock():
                    pass
    finally:
        other.close()
    store.db.execute("PRAGMA user_version=99")
    with pytest.raises(ValueError, match="newer"):
        Store(config)


def test_checkpoint_continuation_gets_new_transport_identity(env):
    _, store, _, tamq, clock, runtime = env
    runtime.tick()
    row = store.leases()[0]
    runtime.worker_update("ack", row["lease_id"], "demo")
    runtime.worker_update(
        "checkpoint",
        row["lease_id"],
        "demo",
        {"summary": "Parser fixed", "next_action": "Run local checks"},
    )
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 2
    assert len(tamq.messages) == 2
    assert store.leases()[0]["state"] == "checkpointed"
    child = store.leases()[1]
    assert "using coordination-engine history" in tamq.calls[1][1]
    assert "State Hub checkpoint" not in tamq.calls[1][1]
    assert child["source"] == "checkpoint"
    assert child["source_id"] == row["trigger_id"]
    runtime.worker_update("ack", child["lease_id"], "demo")
    runtime.worker_update("complete", child["lease_id"], "demo")
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 2


def test_revision_change_does_not_duplicate_active_worker(env):
    _, store, hub, tamq, clock, runtime = env
    runtime.tick()
    hub.data["tasks"][0]["status"] = "progress"
    hub.data["tasks"][0]["updated_at"] = "2"
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 1
    assert store.leases()[0]["state"] == "offered"


def test_new_safety_gate_stops_old_revision_immediately(env):
    _, store, hub, tamq, clock, runtime = env
    runtime.tick()
    hub.data["tasks"][0]["needs_human"] = True
    clock[0] += 15
    runtime.tick()
    assert len(tamq.calls) == 1
    assert all(r["state"] == "stopped" for r in store.leases())


def test_failed_transport_stops_coordination(env):
    _, store, _, tamq, clock, runtime = env
    runtime.tick()
    tamq.state = "failed"
    clock[0] += 15
    runtime.tick()
    assert store.leases()[0]["state"] == "stopped"


@pytest.mark.parametrize(
    "checkpoint",
    [[], {"summary": {}}, {"files_changed": "file"}, {"blocked_reason": []}],
)
def test_malformed_checkpoint_does_not_release_lease(env, checkpoint):
    _, store, _, _, _, runtime = env
    runtime.tick()
    lease = store.leases()[0]["lease_id"]
    runtime.worker_update("ack", lease, "demo")
    with pytest.raises(ValueError):
        runtime.worker_update("checkpoint", lease, "demo", checkpoint)
    assert store.leases()[0]["state"] == "acknowledged"