"""
ActiveBlue AI — Expenses Agent Unit Tests
==========================================
Suite:   test_expenses_agent.py
Module:  agent_service/agents/expenses_agent.py
         agent_service/tools/receipt_parser.py
         addons/activeblue_ai/models/ab_ai_mail.py

Purpose
-------
Verify the core business logic of the expenses agent without requiring
a live Odoo instance, database, or LLM.  All external dependencies
(ORM, HTTP, Ollama) are mocked.  Tests run in < 1 second.

Run
---
    source .venv-test/bin/activate
    python -m pytest tests/test_expenses_agent.py -v

Test groups
-----------
  TestFindSemanticDuplicate  — two-pass duplicate-detection algorithm
  test_plan_*                — intent keyword → user_confirmed / user_dup_decision
  test_act_*                 — _act() confirmation gate and expense creation
  TestParseUpload            — receipt_parser ZIP handling and metadata
  TestTextToHtml             — HTML escaping (skipped without Odoo env)

See tests/TEST_EXPENSES_AGENT.md for full documentation.
"""
from __future__ import annotations

import asyncio
import base64
import io
import zipfile
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

# ---------------------------------------------------------------------------
# _find_semantic_duplicate
# ---------------------------------------------------------------------------

from agent_service.agents.expenses_agent import ExpensesAgent


def _p(vendor='Acme', amount=10.00, date='2026-05-09', time=None):
    """Shorthand for building a parsed-receipt dict."""
    return {'vendor': vendor, 'amount': amount, 'date': date, 'time': time, 'product_name': ''}


def _candidate(parsed):
    """Wrap parsed dict as a (receipt, parsed) candidate tuple."""
    return ({}, parsed)


class TestFindSemanticDuplicate:
    # ------------------------------------------------------------------
    # Pass 1: amount-based match
    # ------------------------------------------------------------------

    def test_exact_match(self):
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme', 10.00, '2026-05-09'), candidates)
        assert idx == 0

    def test_amount_within_threshold(self):
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme', 10.04, '2026-05-09'), candidates)
        assert idx == 0

    def test_amount_just_over_threshold(self):
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme', 10.06, '2026-05-09'), candidates)
        # Pass 1 should miss; Pass 2 should still catch it (same vendor + date)
        assert idx == 0  # caught by Pass 2

    def test_different_date_not_duplicate(self):
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme', 10.00, '2026-05-10'), candidates)
        assert idx is None

    def test_zero_amount_not_deduplicated(self):
        """Zero-amount receipts are too ambiguous — never flagged as dups."""
        candidates = [_candidate(_p('Acme', 0.0, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme', 0.0, '2026-05-09'), candidates)
        assert idx is None

    def test_vendor_similarity_above_threshold(self):
        candidates = [_candidate(_p('IN-N-OUT HOUSTON', 8.55, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('In-N-Out Houston', 8.55, '2026-05-09'), candidates)
        assert idx == 0

    def test_vendor_similarity_below_threshold_pass1(self):
        """Completely different vendors with same amount+date → not a dup."""
        candidates = [_candidate(_p('McDonald\'s', 8.55, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('Starbucks', 8.55, '2026-05-09'), candidates)
        assert idx is None

    def test_time_within_window_is_dup(self):
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09', time='14:00'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('Acme', 10.00, '2026-05-09', time='14:25'), candidates)
        assert idx == 0

    def test_time_outside_window_not_dup(self):
        """Same vendor/amount/date but >30 min apart → different transactions."""
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09', time='12:00'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('Acme', 10.00, '2026-05-09', time='14:00'), candidates)
        assert idx is None

    def test_one_time_missing_does_not_exclude(self):
        """If only one receipt has a time, the time check is skipped."""
        candidates = [_candidate(_p('Acme', 10.00, '2026-05-09', time='12:00'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('Acme', 10.00, '2026-05-09', time=None), candidates)
        assert idx == 0

    def test_filename_vendor_same_amount_date_is_dup(self):
        """Vendor looks like a filename → treated as dup if amount+date match."""
        candidates = [_candidate(_p('20260509_180857.jpg', 10.00, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('20260509_171757.jpg', 10.00, '2026-05-09'), candidates)
        assert idx == 0

    def test_no_candidates(self):
        idx = ExpensesAgent._find_semantic_duplicate(_p(), [])
        assert idx is None

    def test_returns_correct_index_multiple_candidates(self):
        candidates = [
            _candidate(_p('Burger King', 5.00, '2026-05-09')),
            _candidate(_p('Acme', 10.00, '2026-05-09')),
            _candidate(_p('Starbucks', 4.50, '2026-05-08')),
        ]
        idx = ExpensesAgent._find_semantic_duplicate(_p('Acme Corp', 10.00, '2026-05-09'), candidates)
        assert idx == 1

    # ------------------------------------------------------------------
    # Pass 2: OCR amount mismatch (same vendor+date, different amount)
    # ------------------------------------------------------------------

    def test_pass2_catches_ocr_amount_mismatch(self):
        """The In-N-Out $8.55 vs $15.00 bug: vendor ≥80%, same date, amounts far apart."""
        candidates = [_candidate(_p('IN-N-OUT HOUSTON', 8.55, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('In-N-Qut Houston', 15.00, '2026-05-09'), candidates)
        assert idx == 0

    def test_pass2_requires_high_vendor_similarity(self):
        """Pass 2 threshold is 80% — clearly different vendors should not trigger it."""
        # "Starbucks Coffee" vs "McDonalds Burger" share very few characters (~25%)
        candidates = [_candidate(_p('Starbucks Coffee', 8.55, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('McDonalds Burger', 15.00, '2026-05-09'), candidates)
        assert idx is None

    def test_pass2_same_date_required(self):
        candidates = [_candidate(_p('IN-N-OUT HOUSTON', 8.55, '2026-05-08'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('In-N-Out Houston', 15.00, '2026-05-09'), candidates)
        assert idx is None

    def test_pass2_respects_time_window(self):
        """Even with high vendor similarity, >30 min apart means different visit."""
        candidates = [_candidate(_p('IN-N-OUT HOUSTON', 8.55, '2026-05-09', time='12:00'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('In-N-Out Houston', 15.00, '2026-05-09', time='15:00'), candidates)
        assert idx is None

    def test_pass2_skips_filename_vendors(self):
        """Pass 2 does not apply when the vendor looks like a filename."""
        candidates = [_candidate(_p('20260509_180857.jpg', 8.55, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('20260509_171757.jpg', 15.00, '2026-05-09'), candidates)
        # Filenames have different names so similarity will be low;
        # Pass 2 explicitly skips filename vendors.
        assert idx is None

    def test_pass2_zero_amount_not_deduplicated(self):
        candidates = [_candidate(_p('Acme', 0.0, '2026-05-09'))]
        idx = ExpensesAgent._find_semantic_duplicate(
            _p('Acme Corp', 0.0, '2026-05-09'), candidates)
        assert idx is None


# ---------------------------------------------------------------------------
# _plan() — keyword detection
# ---------------------------------------------------------------------------

def _make_agent():
    """Return an ExpensesAgent with all dependencies mocked out."""
    agent = ExpensesAgent.__new__(ExpensesAgent)
    agent._odoo = MagicMock()
    agent._llm = MagicMock()
    agent._peer_bus = None
    agent._et = MagicMock()
    agent._gathered_data = {}
    agent._actions_taken = []
    agent._escalations_list = []
    return agent


def _make_directive(task='', raw_message='', receipts=None):
    directive = MagicMock()
    directive.task = task
    directive.params = {}
    directive.directive_id = 'test-dir'
    directive.context.peer_data = {'raw_message': raw_message, 'requesting_user_id': 1}
    directive.context.receipts = receipts or []
    return directive


async def _run_plan(task='', raw_message='', receipts=None):
    agent = _make_agent()
    agent._directive = _make_directive(task=task, raw_message=raw_message, receipts=receipts)
    return await agent._plan()


@pytest.mark.asyncio
async def test_plan_confirm_keyword_sets_confirmed():
    plan = await _run_plan(raw_message='confirm')
    assert plan['user_confirmed'] is True


@pytest.mark.asyncio
async def test_plan_looks_good_sets_confirmed():
    plan = await _run_plan(raw_message='looks good')
    assert plan['user_confirmed'] is True


@pytest.mark.asyncio
async def test_plan_go_ahead_sets_confirmed():
    plan = await _run_plan(raw_message='go ahead')
    assert plan['user_confirmed'] is True


@pytest.mark.asyncio
async def test_plan_no_keyword_not_confirmed():
    plan = await _run_plan(raw_message='create an expense report')
    assert plan['user_confirmed'] is False


@pytest.mark.asyncio
async def test_plan_keep_all_sets_dup_decision():
    plan = await _run_plan(raw_message='confirm, keep all')
    assert plan['user_confirmed'] is True
    assert plan['user_dup_decision'] == 'keep_all'


@pytest.mark.asyncio
async def test_plan_skip_sets_dup_decision():
    plan = await _run_plan(raw_message='skip duplicates')
    assert plan['user_dup_decision'] == 'skip'


@pytest.mark.asyncio
async def test_plan_default_dup_decision_is_skip():
    """When user says 'confirm' with no dup instruction, default to skip."""
    plan = await _run_plan(raw_message='confirm')
    assert plan['user_dup_decision'] == 'skip'


@pytest.mark.asyncio
async def test_plan_mode_is_read_without_receipts():
    plan = await _run_plan(raw_message='show my expenses')
    assert plan['mode'] == 'read'


@pytest.mark.asyncio
async def test_plan_mode_is_create_with_receipts():
    fake_receipt = {'filename': 'receipt.jpg', 'text': '', 'b64': '', 'sha256': 'abc'}
    plan = await _run_plan(raw_message='create expense report', receipts=[fake_receipt])
    assert plan['mode'] == 'create_from_receipts'


@pytest.mark.asyncio
async def test_plan_task_field_also_checked():
    """master LLM writes intent_summary into task; confirm in task should work."""
    plan = await _run_plan(task='confirm the expense report creation', raw_message='')
    assert plan['user_confirmed'] is True


# ---------------------------------------------------------------------------
# _act() confirmation gate
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_act_enters_awaiting_confirmation_on_first_pass():
    """First call with receipts and no confirm → mode becomes awaiting_confirmation."""
    agent = _make_agent()

    fake_receipt = {
        'filename': 'receipt.jpg', 'text': 'Acme $10.00',
        'b64': '', 'sha256': 'abc123', 'mimetype': 'image/jpeg',
        'date_from_name': None,
    }
    agent._directive = _make_directive(raw_message='create expense report', receipts=[fake_receipt])
    agent._gathered_data = {
        'mode': 'create_from_receipts',
        'user_confirmed': False,
        'user_dup_decision': 'skip',
    }

    parsed_result = {'vendor': 'Acme', 'amount': 10.00, 'date': '2026-05-09',
                     'time': None, 'product_name': ''}

    agent._et.get_employee_id_for_user = AsyncMock(return_value=1)
    agent._et.get_expense_products = AsyncMock(return_value=[
        {'id': 1, 'name': 'Meals'}
    ])

    with patch.object(agent, '_parse_receipt_text', new=AsyncMock(return_value=parsed_result)):
        result = await agent._act({})

    assert result == []
    assert agent._gathered_data['mode'] == 'awaiting_confirmation'
    assert len(agent._confirmation_items) == 1
    vendor, parsed, is_dup = agent._confirmation_items[0]


@pytest.mark.asyncio
async def test_act_creates_sheet_when_confirmed():
    """Second call with user_confirmed=True → expense sheet is created."""
    agent = _make_agent()

    fake_receipt = {
        'filename': 'receipt.jpg', 'text': 'Acme $10.00',
        'b64': base64.b64encode(b'imgdata').decode(), 'sha256': 'abc123',
        'mimetype': 'image/jpeg', 'date_from_name': None,
    }
    agent._directive = _make_directive(raw_message='confirm', receipts=[fake_receipt])
    agent._gathered_data = {
        'mode': 'create_from_receipts',
        'user_confirmed': True,
        'user_dup_decision': 'skip',
    }

    parsed_result = {'vendor': 'Acme', 'amount': 10.00, 'date': '2026-05-09',
                     'time': None, 'product_name': 'Meals'}

    sheet_result = MagicMock(success=True, record_id=42)
    expense_result = MagicMock(success=True, record_id=99)

    agent._et.get_employee_id_for_user = AsyncMock(return_value=1)
    agent._et.get_expense_products = AsyncMock(return_value=[{'id': 1, 'name': 'Meals'}])
    agent._et.create_expense_sheet = AsyncMock(return_value=sheet_result)
    agent._et.create_expense = AsyncMock(return_value=expense_result)
    agent._et.attach_receipt = AsyncMock()

    with patch.object(agent, '_parse_receipt_text', new=AsyncMock(return_value=parsed_result)):
        actions = await agent._act({})

    assert any('Created expense sheet' in a for a in actions)
    assert any('Acme' in a for a in actions)
    agent._et.create_expense_sheet.assert_called_once()
    agent._et.create_expense.assert_called_once()


@pytest.mark.asyncio
async def test_act_deduplicates_byte_identical_receipts():
    """Two receipts with the same SHA256 → only one expense created."""
    agent = _make_agent()

    receipt = {
        'filename': 'receipt.jpg', 'text': 'Acme $10.00',
        'b64': '', 'sha256': 'samehash', 'mimetype': 'image/jpeg',
        'date_from_name': None,
    }
    agent._directive = _make_directive(raw_message='confirm', receipts=[receipt, receipt])
    agent._gathered_data = {
        'mode': 'create_from_receipts',
        'user_confirmed': True,
        'user_dup_decision': 'skip',
    }

    parsed_result = {'vendor': 'Acme', 'amount': 10.00, 'date': '2026-05-09',
                     'time': None, 'product_name': ''}

    sheet_result = MagicMock(success=True, record_id=1)
    expense_result = MagicMock(success=True, record_id=2)

    agent._et.get_employee_id_for_user = AsyncMock(return_value=1)
    agent._et.get_expense_products = AsyncMock(return_value=[{'id': 1, 'name': 'Meals'}])
    agent._et.create_expense_sheet = AsyncMock(return_value=sheet_result)
    agent._et.create_expense = AsyncMock(return_value=expense_result)
    agent._et.attach_receipt = AsyncMock()

    with patch.object(agent, '_parse_receipt_text', new=AsyncMock(return_value=parsed_result)):
        await agent._act({})

    # Only one create_expense call despite two identical receipts
    assert agent._et.create_expense.call_count == 1


@pytest.mark.asyncio
async def test_act_no_employee_returns_empty_and_escalates():
    agent = _make_agent()
    fake_receipt = {'filename': 'r.jpg', 'text': '', 'b64': '', 'sha256': 'x',
                    'mimetype': 'image/jpeg', 'date_from_name': None}
    agent._directive = _make_directive(raw_message='confirm', receipts=[fake_receipt])
    agent._gathered_data = {
        'mode': 'create_from_receipts',
        'user_confirmed': True,
        'user_dup_decision': 'skip',
    }
    agent._et.get_employee_id_for_user = AsyncMock(return_value=None)
    agent._et.get_expense_products = AsyncMock(return_value=[])

    result = await agent._act({})
    assert result == []
    assert any('No employee record' in e for e in agent._escalations_list)


# ---------------------------------------------------------------------------
# parse_upload — receipt_parser.py
# ---------------------------------------------------------------------------

from agent_service.tools.receipt_parser import parse_upload


class TestParseUpload:
    def test_text_file_parsed(self):
        results = parse_upload('receipt.txt', b'Acme Store\nTotal: $10.00')
        assert len(results) == 1
        r = results[0]
        assert r['filename'] == 'receipt.txt'
        assert 'Acme Store' in r['text']
        assert r['mimetype'] == 'text/plain'
        assert r['sha256']  # hash present

    def test_date_extracted_from_filename(self):
        results = parse_upload('20260509_180857.jpg_compressed.JPEG', b'\xff\xd8\xff')
        assert results[0]['date_from_name'] == '2026-05-09'

    def test_no_date_in_plain_filename(self):
        results = parse_upload('receipt.txt', b'text')
        assert results[0]['date_from_name'] is None

    def test_zip_extracted(self):
        buf = io.BytesIO()
        with zipfile.ZipFile(buf, 'w') as zf:
            zf.writestr('receipt.txt', 'Vendor: Acme\nTotal: $5.00')
            zf.writestr('other.txt', 'Another receipt')
        results = parse_upload('bundle.zip', buf.getvalue())
        assert len(results) == 2
        filenames = {r['filename'] for r in results}
        assert 'receipt.txt' in filenames
        assert 'other.txt' in filenames

    def test_zip_skips_directories(self):
        buf = io.BytesIO()
        with zipfile.ZipFile(buf, 'w') as zf:
            zf.writestr('subdir/', '')          # directory entry
            zf.writestr('subdir/file.txt', 'content')
        results = parse_upload('bundle.zip', buf.getvalue())
        assert len(results) == 1
        assert results[0]['filename'] == 'file.txt'

    def test_empty_zip_returns_empty(self):
        buf = io.BytesIO()
        with zipfile.ZipFile(buf, 'w'):
            pass
        results = parse_upload('empty.zip', buf.getvalue())
        assert results == []

    def test_sha256_is_consistent(self):
        data = b'some receipt bytes'
        r1 = parse_upload('a.txt', data)[0]
        r2 = parse_upload('b.txt', data)[0]
        assert r1['sha256'] == r2['sha256']

    def test_b64_decodes_to_original(self):
        data = b'receipt content here'
        result = parse_upload('r.txt', data)[0]
        assert base64.b64decode(result['b64']) == data


# ---------------------------------------------------------------------------
# _text_to_html — ab_ai_mail.py
# ---------------------------------------------------------------------------

from agent_service.agents.expenses_agent import ExpensesAgent  # already imported

# Import from Odoo addon directly
import sys, importlib

def _get_text_to_html():
    """Import _text_to_html without triggering Odoo module loading."""
    import importlib.util, pathlib
    path = pathlib.Path(__file__).parent.parent / 'addons' / 'activeblue_ai' / 'models' / 'ab_ai_mail.py'
    spec = importlib.util.spec_from_file_location('ab_ai_mail', path)
    mod = importlib.util.module_from_spec(spec)
    # Stub out the odoo imports so the module loads without Odoo installed
    sys.modules.setdefault('odoo', MagicMock())
    sys.modules.setdefault('odoo.SUPERUSER_ID', MagicMock())
    sys.modules.setdefault('markupsafe', __import__('markupsafe'))
    spec.loader.exec_module(mod)
    return mod._text_to_html


class TestTextToHtml:
    @pytest.fixture(autouse=True)
    def fn(self):
        try:
            self._fn = _get_text_to_html()
        except Exception:
            pytest.skip('ab_ai_mail could not be imported without Odoo environment')

    def test_plain_text_unchanged(self):
        result = str(self._fn('hello world'))
        assert 'hello world' in result

    def test_newline_becomes_br(self):
        result = str(self._fn('line one\nline two'))
        assert '<br>' in result
        assert 'line one' in result
        assert 'line two' in result

    def test_html_special_chars_escaped(self):
        result = str(self._fn('<script>alert("xss")</script>'))
        assert '<script>' not in result
        assert '&lt;script&gt;' in result

    def test_ampersand_escaped(self):
        result = str(self._fn('Layal Cafe & Banquet'))
        assert '&amp;' in result

    def test_empty_string(self):
        result = str(self._fn(''))
        assert result == ''