"""
Copyright 2024-2026 ReplyPier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

FAQ generation service tests: batching/dedup helpers, the end-to-end job with
a mocked model, and the auto-generation hook's skip conditions.
"""
from types import SimpleNamespace
from unittest.mock import AsyncMock, patch

import pytest

from app.agents.faq_generator import GeneratedFAQ
from app.models.faq import FAQ, FAQStatus
from app.models.faq_generation_job import FAQGenerationJob, FAQJobStatus, FAQJobType
from app.models.help_center import HelpCenterSettings
from app.models.knowledge import Knowledge, SourceType
from app.repositories.faq import FAQRepository
from app.repositories.faq_generation_job import FAQGenerationJobRepository
from app.services import faq_generation
from app.services.faq_generation import (
    CategoryMerger,
    DedupState,
    maybe_enqueue_auto_faq_job,
    normalize_question,
    pack_batches,
    run_generation_job,
)


# ---------- helpers ----------

def _make_knowledge(db, org_id, source="docs.example.com"):
    knowledge = Knowledge(
        source=source, source_type=SourceType.WEBSITE,
        schema="ai", table_name="d_test", organization_id=org_id,
    )
    db.add(knowledge)
    db.commit()
    db.refresh(knowledge)
    return knowledge


def _make_job(db, org_id, **kwargs):
    job = FAQGenerationJob(organization_id=org_id, **kwargs)
    db.add(job)
    db.commit()
    db.refresh(job)
    return job


# ---------- unit helpers ----------

def test_fail_orphaned_processing_reaps_only_processing(db, test_organization):
    """Worker-startup reap: processing jobs (orphaned by a kill) fail; pending
    and terminal jobs are untouched."""
    org = test_organization.id
    stuck = _make_job(db, org, job_type=FAQJobType.IMPORT_ARTICLES.value, status=FAQJobStatus.PROCESSING.value)
    pending = _make_job(db, org, job_type=FAQJobType.GENERATE_ALL.value, status=FAQJobStatus.PENDING.value)
    done = _make_job(db, org, job_type=FAQJobType.IMPORT_URL.value, status=FAQJobStatus.COMPLETED.value)

    reaped = FAQGenerationJobRepository(db).fail_orphaned_processing("killed")
    assert reaped == 1
    db.refresh(stuck); db.refresh(pending); db.refresh(done)
    assert stuck.status == FAQJobStatus.FAILED.value and stuck.error == "killed"
    assert pending.status == FAQJobStatus.PENDING.value
    assert done.status == FAQJobStatus.COMPLETED.value


def test_stale_processing_job_excluded_from_active_and_reaped(db, test_organization):
    """A processing job whose progress stopped advancing past the threshold is
    treated as dead: hidden from active-job polling and reaped on enqueue."""
    from datetime import datetime, timedelta, timezone

    org = test_organization.id
    repo = FAQGenerationJobRepository(db)
    fresh = _make_job(db, org, job_type=FAQJobType.GENERATE_ALL.value, status=FAQJobStatus.PROCESSING.value)
    stale = _make_job(db, org, job_type=FAQJobType.IMPORT_URL.value, status=FAQJobStatus.PROCESSING.value)
    # Backdate the stale job's last progress well past FAQ_JOB_STALE_SECONDS.
    stale.updated_at = datetime.now(timezone.utc) - timedelta(hours=1)
    db.commit()

    active = repo.get_active_for_org(org)
    assert active is not None and active.id == fresh.id  # stale one excluded

    reaped = repo.fail_orphaned_processing("dead", older_than_seconds=600, organization_id=org)
    assert reaped == 1
    db.refresh(fresh); db.refresh(stale)
    assert stale.status == FAQJobStatus.FAILED.value  # only the stale one
    assert fresh.status == FAQJobStatus.PROCESSING.value


def test_normalize_question():
    assert normalize_question("How do I sign up?") == normalize_question("how do i SIGN UP")
    assert normalize_question("  A,  b!! ") == "a b"


def test_pack_batches_packs_whole_pages():
    pages = ["a" * 6000, "b" * 6000, "c" * 6000]
    batches = pack_batches(pages, max_chars=15000)
    assert len(batches) == 2
    assert "a" in batches[0] and "b" in batches[0]
    assert batches[1].startswith("c")


def test_pack_batches_truncates_oversize_item():
    batches = pack_batches(["x" * 20000, "y" * 10], max_chars=15000)
    assert len(batches) == 2
    assert len(batches[0]) <= 15000  # oversized item truncated, never split


def test_dedup_state_blocks_existing_and_repeats():
    dedup = DedupState(["How do I sign up?"])
    accepted = dedup.accept_new([
        GeneratedFAQ(question="how do i sign up", answer="a", category="c"),   # rephrased dupe
        GeneratedFAQ(question="What does it cost?", answer="a", category="c"),
        GeneratedFAQ(question="What does it cost", answer="b", category="c"),  # same-run dupe
    ])
    assert [f.question for f in accepted] == ["What does it cost?"]


def test_dedup_state_catches_fuzzy_rephrasings():
    dedup = DedupState(["How do I reset my account password?"])
    accepted = dedup.accept_new([
        # Same content words, different filler/order → fuzzy dupe.
        GeneratedFAQ(question="How can I reset the password on my account?", answer="a", category="c"),
        # Genuinely different question sharing some words → kept.
        GeneratedFAQ(question="How do I change my account email address?", answer="a", category="c"),
    ])
    assert [f.question for f in accepted] == ["How do I change my account email address?"]


def test_dedup_state_short_questions_skip_fuzzy():
    # < FUZZY_MIN_CONTENT_TOKENS content words: only exact matches dedup, so
    # near-misses like these both survive.
    dedup = DedupState(["How do I pay?"])
    accepted = dedup.accept_new([
        GeneratedFAQ(question="How do I pay invoices?", answer="a", category="c"),
    ])
    assert len(accepted) == 1


def test_dedup_prompt_window_is_bounded():
    questions = [f"How does feature number {i} work in the product today?" for i in range(100)]
    dedup = DedupState(questions)
    assert len(dedup.for_prompt) == faq_generation.MAX_PROMPT_QUESTIONS
    # The full set still dedups beyond the window.
    accepted = dedup.accept_new([
        GeneratedFAQ(question=questions[0], answer="a", category="c"),
    ])
    assert accepted == []


def test_category_merger_case_insensitive(db, test_organization):
    FAQRepository(db).create(FAQ(
        organization_id=test_organization.id, question="q", answer="a", category="Billing",
    ))
    merger = CategoryMerger(db, test_organization.id)
    assert merger.merge("BILLING") == "Billing"
    assert merger.merge("Refunds") == "Refunds"
    assert merger.merge("  ") == "General"
    assert "Refunds" in merger.names


# ---------- generation job ----------

@pytest.mark.asyncio
async def test_run_generation_job_inserts_deduped_drafts(db, test_organization, test_ai_config):
    knowledge = _make_knowledge(db, test_organization.id)
    # Pre-existing FAQ that generated output must not duplicate.
    FAQRepository(db).create(FAQ(
        organization_id=test_organization.id, question="How do I sign up?",
        answer="Existing.", category="Getting started",
    ))
    job = _make_job(db, test_organization.id, job_type=FAQJobType.GENERATE_ALL.value)

    generated = [
        GeneratedFAQ(question="How do I sign up?", answer="dupe", category="Getting started"),
        GeneratedFAQ(question="Is my data safe?", answer="Yes.", category="SECURITY"),
    ]
    mock_generator = SimpleNamespace(generate_from_text=AsyncMock(return_value=generated), batch_chars=15000)
    with patch.object(faq_generation, "build_generator", return_value=mock_generator), \
         patch.object(faq_generation, "load_source_pages", return_value=["page one text"]):
        created = await run_generation_job(db, job)

    assert created == 1
    rows = db.query(FAQ).filter(FAQ.question == "Is my data safe?").all()
    assert len(rows) == 1
    assert rows[0].status == FAQStatus.DRAFT.value
    assert rows[0].knowledge_id == knowledge.id
    assert rows[0].source_label == "docs.example.com"
    assert rows[0].generation_job_id == job.id
    # Category kept the model's spelling since no existing "security" category.
    assert rows[0].category == "SECURITY"


@pytest.mark.asyncio
async def test_run_generation_job_fails_without_sources(db, test_organization, test_ai_config):
    job = _make_job(db, test_organization.id, job_type=FAQJobType.GENERATE_ALL.value)
    with patch.object(faq_generation, "build_generator", return_value=SimpleNamespace()):
        with pytest.raises(ValueError, match="No knowledge sources"):
            await run_generation_job(db, job)


@pytest.mark.asyncio
async def test_run_generation_job_fails_when_all_batches_fail(db, test_organization, test_ai_config):
    _make_knowledge(db, test_organization.id)
    job = _make_job(db, test_organization.id, job_type=FAQJobType.GENERATE_ALL.value)
    mock_generator = SimpleNamespace(generate_from_text=AsyncMock(side_effect=RuntimeError("boom")), batch_chars=15000)
    with patch.object(faq_generation, "build_generator", return_value=mock_generator), \
         patch.object(faq_generation, "load_source_pages", return_value=["text"]):
        # The underlying provider error is now surfaced (e.g. an unsupported model),
        # instead of a generic "every content batch" message.
        with pytest.raises(RuntimeError, match="boom"):
            await run_generation_job(db, job)
    # One retry per batch.
    assert mock_generator.generate_from_text.await_count == 2


@pytest.mark.asyncio
async def test_generate_source_job_scopes_to_one_source(db, test_organization, test_ai_config):
    k1 = _make_knowledge(db, test_organization.id, "a.example.com")
    _make_knowledge(db, test_organization.id, "b.example.com")
    job = _make_job(
        db, test_organization.id,
        job_type=FAQJobType.GENERATE_SOURCE.value, knowledge_id=k1.id,
    )
    seen_sources = []

    def fake_load(db_, knowledge, max_chars=None):
        seen_sources.append(knowledge.source)
        return ["content"]

    mock_generator = SimpleNamespace(generate_from_text=AsyncMock(return_value=[]), batch_chars=15000)
    with patch.object(faq_generation, "build_generator", return_value=mock_generator), \
         patch.object(faq_generation, "load_source_pages", side_effect=fake_load):
        await run_generation_job(db, job)
    assert seen_sources == ["a.example.com"]


@pytest.mark.asyncio
async def test_generate_all_skips_sources_with_faqs(db, test_organization, test_ai_config):
    """Regenerate only reads sources that haven't produced FAQs yet."""
    done = _make_knowledge(db, test_organization.id, "done.example.com")
    _make_knowledge(db, test_organization.id, "new.example.com")
    FAQRepository(db).create(FAQ(
        organization_id=test_organization.id, question="q", answer="a",
        category="General", knowledge_id=done.id,
    ))
    job = _make_job(db, test_organization.id, job_type=FAQJobType.GENERATE_ALL.value)
    seen = []

    def fake_load(db_, knowledge, max_chars=None):
        seen.append(knowledge.source)
        return ["content"]

    mock_generator = SimpleNamespace(generate_from_text=AsyncMock(return_value=[]), batch_chars=15000)
    with patch.object(faq_generation, "build_generator", return_value=mock_generator), \
         patch.object(faq_generation, "load_source_pages", side_effect=fake_load):
        await run_generation_job(db, job)
    assert seen == ["new.example.com"]


@pytest.mark.asyncio
async def test_generate_all_errors_when_everything_generated(db, test_organization, test_ai_config):
    k = _make_knowledge(db, test_organization.id)
    FAQRepository(db).create(FAQ(
        organization_id=test_organization.id, question="q", answer="a",
        category="General", knowledge_id=k.id,
    ))
    job = _make_job(db, test_organization.id, job_type=FAQJobType.GENERATE_ALL.value)
    with patch.object(faq_generation, "build_generator", return_value=SimpleNamespace(batch_chars=15000)):
        with pytest.raises(ValueError, match="already have FAQs"):
            await run_generation_job(db, job)


@pytest.mark.asyncio
async def test_generate_all_explicit_ids_override_skip(db, test_organization, test_ai_config):
    """knowledge_ids explicitly re-targets an already-generated source."""
    done = _make_knowledge(db, test_organization.id, "done.example.com")
    _make_knowledge(db, test_organization.id, "other.example.com")
    FAQRepository(db).create(FAQ(
        organization_id=test_organization.id, question="q", answer="a",
        category="General", knowledge_id=done.id,
    ))
    job = _make_job(
        db, test_organization.id,
        job_type=FAQJobType.GENERATE_ALL.value, knowledge_ids=[done.id],
    )
    seen = []

    def fake_load(db_, knowledge, max_chars=None):
        seen.append(knowledge.source)
        return ["content"]

    mock_generator = SimpleNamespace(generate_from_text=AsyncMock(return_value=[]), batch_chars=15000)
    with patch.object(faq_generation, "build_generator", return_value=mock_generator), \
         patch.object(faq_generation, "load_source_pages", side_effect=fake_load):
        await run_generation_job(db, job)
    assert seen == ["done.example.com"]


# ---------- auto-generation hook ----------

def _queue_item(org_id, source="docs.example.com", user_id=None):
    return SimpleNamespace(organization_id=org_id, source=source, user_id=user_id)


def _adopt(db, org_id):
    """Mark the org as having explicitly used generation (the opt-in signal)."""
    _make_job(db, org_id, job_type=FAQJobType.GENERATE_ALL.value, status=FAQJobStatus.COMPLETED.value)


def _allow_plan():
    """Env-independent plan gate (local enterprise builds fail closed)."""
    return patch("app.services.help_center_access.help_center_allowed", return_value=True)


def test_auto_hook_skips_when_feature_never_used(db, test_organization):
    _make_knowledge(db, test_organization.id)
    with _allow_plan():
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is None


def test_auto_hook_settings_row_alone_is_not_opt_in(db, test_organization):
    """Opening the admin page (which creates the settings row) must not turn
    on auto-generation — only an explicit generate/import (or FAQ) does."""
    _make_knowledge(db, test_organization.id)
    db.add(HelpCenterSettings(organization_id=test_organization.id, slug="test-org"))
    db.commit()
    with _allow_plan():
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is None


def test_auto_hook_enqueues_for_adopted_org(db, test_organization):
    knowledge = _make_knowledge(db, test_organization.id)
    db.add(HelpCenterSettings(organization_id=test_organization.id, slug="test-org"))
    db.commit()
    _adopt(db, test_organization.id)
    with _allow_plan():
        job = maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id))
    assert job is not None
    assert job.job_type == FAQJobType.GENERATE_SOURCE.value
    assert job.knowledge_id == knowledge.id
    assert job.status == FAQJobStatus.PENDING.value


def test_auto_hook_respects_auto_generate_toggle(db, test_organization):
    _make_knowledge(db, test_organization.id)
    db.add(HelpCenterSettings(
        organization_id=test_organization.id, slug="test-org", auto_generate=False,
    ))
    db.commit()
    _adopt(db, test_organization.id)
    with _allow_plan():
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is None


def test_auto_hook_dedups_active_job(db, test_organization):
    knowledge = _make_knowledge(db, test_organization.id)
    db.add(HelpCenterSettings(organization_id=test_organization.id, slug="test-org"))
    db.commit()
    _adopt(db, test_organization.id)
    with _allow_plan():
        first = maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id))
        assert first is not None
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is None
        # Once the first completes, a new one may be enqueued.
        FAQGenerationJobRepository(db).mark_completed(first.id, faqs_created=0)
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is not None
    assert knowledge.id is not None


def test_auto_hook_skips_when_plan_disallows(db, test_organization):
    _make_knowledge(db, test_organization.id)
    db.add(HelpCenterSettings(organization_id=test_organization.id, slug="test-org"))
    db.commit()
    _adopt(db, test_organization.id)
    # Effective because the hook imports help_center_allowed at call time.
    with patch("app.services.help_center_access.help_center_allowed", return_value=False):
        assert maybe_enqueue_auto_faq_job(db, _queue_item(test_organization.id)) is None


def test_auto_hook_never_raises(db, test_organization):
    broken = SimpleNamespace(organization_id=None, source=None, user_id=None)
    assert maybe_enqueue_auto_faq_job(db, broken) is None