"""Inline verification for the install/search/show/wallet CLI commands.

Wires httpx.MockTransport fakes for the ledger/registry/catalog clients (per
contracts/ledger-api.md, contracts/registry-layout.md, contracts/catalog-index.md)
and a fake ApplyAdapter (the T021 local adapter lands on a sibling branch and
isn't merged into this worktree yet — the CLI must not depend on its internals).
"""

from __future__ import annotations

import base64
import io
import json
import tarfile

import httpx
import pytest
from click.testing import CliRunner

import m2_market.cli as cli_mod
from m2_market.apply.base import ApplyResult, Changeset

LISTING_ID = "lst_pdf_export"
INSTALL_REF = "lst_pdf_export-v1.0.0"
OPERATOR = "buyer1"
SELLER = "seller1"

LISTING = {
    "listing_id": LISTING_ID,
    "solution_id": "sol_pdf_export",
    "solution_version": "1.0.0",
    "inventory_type": "solution",
    "name": "PDF Export",
    "summary": "Branded PDF reports.",
    "category": "productivity",
    "price": {"amount": 20, "currency": "m2cr", "model": "fixed"},
    "seller": SELLER,
    "evidence_summary": "Used on 12 sessions, saved 40 min avg.",
    "tenant_visibility": ["*"],
    "stats": {"installs": 3, "rating": 4.5, "proposals_shown": 5, "proposals_accepted": 3},
    "status": "published",
    "install_ref": INSTALL_REF,
}

SOLUTION = {
    "schema_version": "m2.solution.v1",
    "solution_id": "sol_pdf_export",
    "name": "PDF Export",
    "summary": "Branded PDF reports.",
    "intent": "export pdfs",
    "deployment": {
        "recipe_ref": "recipe.yaml",
        "entrypoint": "m2-pdf-export --help",
        "verify_command": "true",
    },
    "applicability": {},
    "tenant_scope": "m2-core",
    "evidence": [{"source": "session-123"}],
    "content_hash": "",
    "price": {"amount": 20, "currency": "m2cr", "model": "fixed"},
    "seller": SELLER,
    "license": {"terms": "internal", "major_version_coverage": True},
    "permissions": ["fs:write:~/reports"],
}


def _make_bundle_bytes() -> bytes:
    buf = io.BytesIO()
    with tarfile.open(fileobj=buf, mode="w:gz") as tar:
        data = b"entrypoint stub\n"
        info = tarfile.TarInfo(name="bundle/recipe.yaml")
        info.size = len(data)
        tar.addfile(info, io.BytesIO(data))
    return buf.getvalue()


BUNDLE_BYTES = _make_bundle_bytes()


class FakeState:
    """Records calls made against the fake ledger/registry backends."""

    def __init__(self):
        self.install_calls = 0
        self.refund_calls = 0
        self.license_exists = False
        self.insufficient_funds = False


def _b64_json(payload: dict) -> str:
    return base64.b64encode(json.dumps(payload).encode("utf-8")).decode("ascii")


def make_handler(state: FakeState):
    def handler(request: httpx.Request) -> httpx.Response:
        host = request.url.host
        path = request.url.path

        if host == "ledger.test":
            if path == "/tx/install" and request.method == "POST":
                state.install_calls += 1
                if state.insufficient_funds:
                    return httpx.Response(402, json={"error": "insufficient_funds", "balance": 0})
                return httpx.Response(
                    200,
                    json={
                        "tx_ids": ["tx1", "tx2"],
                        "grant": {"grant_id": "grant-1", "listing_id": LISTING_ID, "operator_id": OPERATOR},
                    },
                )
            if path == "/tx/refund" and request.method == "POST":
                state.refund_calls += 1
                return httpx.Response(200, json={"tx_ids": ["tx-refund"]})
            if path.startswith("/license/"):
                if state.license_exists:
                    return httpx.Response(200, json={"grant": {"grant_id": "grant-1"}})
                return httpx.Response(404, json={"error": "not_found"})
            if path.startswith("/balance/"):
                return httpx.Response(200, json={"operator_id": OPERATOR, "balance": 80, "as_of": "now"})
            if path == "/tx":
                return httpx.Response(
                    200,
                    json={
                        "transactions": [
                            {"ts": "t1", "from": OPERATOR, "to": SELLER, "amount": 18, "reason": "install", "ref": "r1"},
                            {"ts": "t2", "from": OPERATOR, "to": "platform", "amount": 2, "reason": "install", "ref": "r1"},
                        ]
                    },
                )

        if host == "registry.test":
            if path.endswith("/contents/listings/lst_pdf_export/solution.json"):
                return httpx.Response(200, json={"content": _b64_json(SOLUTION)})
            if path.endswith(f"/releases/tags/{INSTALL_REF}"):
                return httpx.Response(
                    200,
                    json={
                        "assets": [
                            {
                                "name": "bundle.tar.gz",
                                "browser_download_url": "https://registry.test/download/bundle.tar.gz",
                            }
                        ]
                    },
                )
            if path == "/download/bundle.tar.gz":
                return httpx.Response(200, content=BUNDLE_BYTES)

        if host == "catalog.test" and path == "/search":
            body = json.loads(request.content)
            if body["query_text"] == LISTING_ID:
                return httpx.Response(200, json={"items": [{"listing_id": LISTING_ID, "score": 0.9, "listing": LISTING}]})
            return httpx.Response(200, json={"items": [{"listing_id": LISTING_ID, "score": 0.8, "listing": LISTING}]})

        raise AssertionError(f"unexpected request: {request.method} {request.url}")

    return handler


@pytest.fixture
def fake_backend(monkeypatch):
    state = FakeState()
    handler = make_handler(state)

    orig_init = httpx.Client.__init__

    def patched_init(self, *args, **kwargs):
        kwargs["transport"] = httpx.MockTransport(handler)
        orig_init(self, *args, **kwargs)

    monkeypatch.setattr(httpx.Client, "__init__", patched_init)
    return state


@pytest.fixture
def config_env(tmp_path, monkeypatch):
    config_path = tmp_path / "config.toml"
    config_path.write_text(
        f"""
operator_id = "{OPERATOR}"
tenant = "test-tenant"
ledger_url = "https://ledger.test"
ledger_api_key = "lk"
memory_api_url = "https://catalog.test"
memory_api_key = "mk"
forgejo_url = "https://registry.test"
forgejo_token = "rt"
apply_adapter = "fake"
"""
    )
    state_path = tmp_path / "state.json"
    monkeypatch.setenv("M2_MARKET_CONFIG", str(config_path))
    monkeypatch.setenv("M2_MARKET_STATE", str(state_path))
    return state_path


class FakeAdapterCalls:
    def __init__(self):
        self.plan_calls = 0
        self.apply_calls = 0
        self.verify_calls = 0
        self.apply_should_fail = False


def make_fake_get_adapter(calls: FakeAdapterCalls):
    class FakeAdapter:
        name = "fake"

        def plan(self, bundle, state):
            calls.plan_calls += 1
            return Changeset(listing_id="sol_pdf_export", version="1.0.0", items=[], changeset_hash="sha256:abc")

        def apply(self, changeset):
            calls.apply_calls += 1
            if calls.apply_should_fail:
                return ApplyResult(ok=False, applied=[], errors=["recipe check failed"])
            return ApplyResult(ok=True, applied=[], errors=[])

        def verify(self, bundle, state):
            calls.verify_calls += 1
            return True

        def rollback(self, changeset):
            pass

    def get_adapter(name):
        return FakeAdapter()

    return get_adapter


def test_funded_install_happy_path(fake_backend, config_env, monkeypatch):
    calls = FakeAdapterCalls()
    monkeypatch.setattr(cli_mod, "get_adapter", make_fake_get_adapter(calls))

    runner = CliRunner()
    result = runner.invoke(cli_mod.main, ["install", LISTING_ID, "--yes"])

    assert result.exit_code == 0, result.output
    assert "m2-pdf-export --help" in result.output
    assert fake_backend.install_calls == 1
    assert fake_backend.refund_calls == 0
    assert calls.plan_calls == 1
    assert calls.apply_calls == 1
    assert calls.verify_calls == 1


def test_insufficient_funds_no_adapter_call(fake_backend, config_env, monkeypatch):
    fake_backend.insufficient_funds = True
    calls = FakeAdapterCalls()
    monkeypatch.setattr(cli_mod, "get_adapter", make_fake_get_adapter(calls))

    runner = CliRunner()
    result = runner.invoke(cli_mod.main, ["install", LISTING_ID, "--yes"])

    assert result.exit_code == cli_mod.EXIT_INSUFFICIENT_FUNDS, result.output
    assert calls.plan_calls == 0
    assert calls.apply_calls == 0
    assert fake_backend.refund_calls == 0


def test_rerun_is_idempotent_noop_without_second_debit(fake_backend, config_env, monkeypatch):
    calls = FakeAdapterCalls()
    monkeypatch.setattr(cli_mod, "get_adapter", make_fake_get_adapter(calls))

    runner = CliRunner()
    first = runner.invoke(cli_mod.main, ["install", LISTING_ID, "--yes"])
    assert first.exit_code == 0, first.output
    assert fake_backend.install_calls == 1

    fake_backend.license_exists = True
    second = runner.invoke(cli_mod.main, ["install", LISTING_ID, "--yes"])

    assert second.exit_code == 0, second.output
    assert fake_backend.install_calls == 1  # no second debit
    assert calls.plan_calls == 1  # adapter not invoked again


def test_apply_failure_triggers_refund_and_exit_4(fake_backend, config_env, monkeypatch):
    calls = FakeAdapterCalls()
    calls.apply_should_fail = True
    monkeypatch.setattr(cli_mod, "get_adapter", make_fake_get_adapter(calls))

    runner = CliRunner()
    result = runner.invoke(cli_mod.main, ["install", LISTING_ID, "--yes"])

    assert result.exit_code == cli_mod.EXIT_APPLY_FAILED, result.output
    assert fake_backend.install_calls == 1
    assert fake_backend.refund_calls == 1
    assert "refunded" in result.output


def test_wallet_prints_balance_and_recent_tx(fake_backend, config_env):
    runner = CliRunner()
    result = runner.invoke(cli_mod.main, ["wallet"])

    assert result.exit_code == 0, result.output
    assert "80" in result.output
    assert "install" in result.output


def test_search_renders_table(fake_backend, config_env):
    runner = CliRunner()
    result = runner.invoke(cli_mod.main, ["search", "pdf report"])

    assert result.exit_code == 0, result.output
    assert LISTING_ID in result.output
    assert "PDF Export" in result.output