"""
Tests for the FileProcessingStep model and step_manager utilities.

This test module verifies the new explicit status tracking approach.
"""

from datetime import datetime, timedelta
from unittest.mock import patch

import pytest
from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker

from app.config import settings
from app.database import Base
from app.models import FileProcessingStep, FileRecord
from app.utils.step_manager import (
    MAIN_PROCESSING_STEPS,
    TERMINAL_STEP,
    add_upload_steps,
    get_file_overall_status,
    get_file_step_status,
    get_step_summary,
    initialize_file_steps,
    update_step_status,
)


@pytest.fixture
def db_session():
    """Create an in-memory SQLite database for testing."""
    engine = create_engine("sqlite:///:memory:")
    Base.metadata.create_all(engine)
    SessionLocal = sessionmaker(bind=engine)
    session = SessionLocal()

    yield session

    session.close()
    Base.metadata.drop_all(engine)


@pytest.mark.unit
class TestFileProcessingStepModel:
    """Test the FileProcessingStep model."""

    def test_create_step(self, db_session: Session):
        """Test creating a processing step."""
        # Create a file record first
        file_record = FileRecord(
            filehash="test123", original_filename="test.pdf", local_filename="/tmp/test.pdf", file_size=1024
        )
        db_session.add(file_record)
        db_session.commit()

        # Create a processing step
        step = FileProcessingStep(file_id=file_record.id, step_name="create_file_record", status="success")
        db_session.add(step)
        db_session.commit()

        assert step.id is not None
        assert step.file_id == file_record.id
        assert step.step_name == "create_file_record"
        assert step.status == "success"

    def test_unique_constraint(self, db_session: Session):
        """Test that the unique constraint on (file_id, step_name) works."""
        # Create a file record
        file_record = FileRecord(
            filehash="test456", original_filename="test2.pdf", local_filename="/tmp/test2.pdf", file_size=2048
        )
        db_session.add(file_record)
        db_session.commit()

        # Create first step
        step1 = FileProcessingStep(file_id=file_record.id, step_name="create_file_record", status="in_progress")
        db_session.add(step1)
        db_session.commit()

        # Try to create duplicate step - should fail
        step2 = FileProcessingStep(file_id=file_record.id, step_name="create_file_record", status="success")
        db_session.add(step2)

        with pytest.raises(Exception):  # SQLAlchemy will raise an integrity error
            db_session.commit()


@pytest.mark.unit
class TestStepManager:
    """Test step_manager utility functions."""

    def test_initialize_file_steps(self, db_session: Session):
        """Test initializing processing steps for a file."""
        # Create a file record
        file_record = FileRecord(
            filehash="test789", original_filename="test3.pdf", local_filename="/tmp/test3.pdf", file_size=4096
        )
        db_session.add(file_record)
        db_session.commit()

        # Initialize steps
        initialize_file_steps(db_session, file_record.id)

        # Verify steps were created
        steps = db_session.query(FileProcessingStep).filter(FileProcessingStep.file_id == file_record.id).all()

        assert len(steps) == len(MAIN_PROCESSING_STEPS)
        for step in steps:
            assert step.status == "pending"
            assert step.step_name in MAIN_PROCESSING_STEPS

    def test_add_upload_steps(self, db_session: Session):
        """Test adding upload destination steps."""
        # Create a file record
        file_record = FileRecord(
            filehash="test101112", original_filename="test4.pdf", local_filename="/tmp/test4.pdf", file_size=8192
        )
        db_session.add(file_record)
        db_session.commit()

        # Add upload steps
        destinations = ["dropbox", "s3", "nextcloud"]
        add_upload_steps(db_session, file_record.id, destinations)

        # Verify upload steps were created
        steps = db_session.query(FileProcessingStep).filter(FileProcessingStep.file_id == file_record.id).all()

        # Should have 2 steps per destination (queue_ and upload_to_)
        assert len(steps) == len(destinations) * 2

        expected_steps = []
        for dest in destinations:
            expected_steps.append(f"queue_{dest}")
            expected_steps.append(f"upload_to_{dest}")

        for step in steps:
            assert step.step_name in expected_steps
            assert step.status == "pending"

    def test_update_step_status_new_step(self, db_session: Session):
        """Test updating status creates step if it doesn't exist."""
        # Create a file record
        file_record = FileRecord(
            filehash="test131415", original_filename="test5.pdf", local_filename="/tmp/test5.pdf", file_size=16384
        )
        db_session.add(file_record)
        db_session.commit()

        # Update a step that doesn't exist yet
        now = datetime.now()
        update_step_status(db_session, file_record.id, "create_file_record", "in_progress", started_at=now)

        # Verify step was created
        step = (
            db_session.query(FileProcessingStep)
            .filter(FileProcessingStep.file_id == file_record.id, FileProcessingStep.step_name == "create_file_record")
            .first()
        )

        assert step is not None
        assert step.status == "in_progress"
        assert step.started_at == now

    def test_update_step_status_existing_step(self, db_session: Session):
        """Test updating status of existing step."""
        # Create a file record and initialize steps
        file_record = FileRecord(
            filehash="test161718", original_filename="test6.pdf", local_filename="/tmp/test6.pdf", file_size=32768
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Update an existing step
        now = datetime.now()
        update_step_status(
            db_session,
            file_record.id,
            "create_file_record",
            "success",
            started_at=now - timedelta(seconds=5),
            completed_at=now,
        )

        # Verify step was updated
        step = (
            db_session.query(FileProcessingStep)
            .filter(FileProcessingStep.file_id == file_record.id, FileProcessingStep.step_name == "create_file_record")
            .first()
        )

        assert step.status == "success"
        assert step.started_at == now - timedelta(seconds=5)
        assert step.completed_at == now

    def test_get_file_step_status(self, db_session: Session):
        """Test retrieving all step statuses for a file."""
        # Create a file record and initialize steps
        file_record = FileRecord(
            filehash="test192021", original_filename="test7.pdf", local_filename="/tmp/test7.pdf", file_size=65536
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Update some steps - use actual step names from MAIN_PROCESSING_STEPS
        now = datetime.now()
        update_step_status(db_session, file_record.id, "create_file_record", "success", completed_at=now)
        update_step_status(db_session, file_record.id, "check_text", "in_progress", started_at=now)
        update_step_status(
            db_session, file_record.id, "extract_text", "failure", error_message="Failed to extract text"
        )

        # Get all step statuses
        status_map = get_file_step_status(db_session, file_record.id)

        assert len(status_map) == len(MAIN_PROCESSING_STEPS)
        assert status_map["create_file_record"]["status"] == "success"
        assert status_map["create_file_record"]["completed_at"] == now
        assert status_map["check_text"]["status"] == "in_progress"
        assert status_map["extract_text"]["status"] == "failure"
        assert status_map["extract_text"]["error_message"] == "Failed to extract text"

    def test_get_file_overall_status_pending(self, db_session: Session):
        """Test overall status for a file with pending steps."""
        file_record = FileRecord(
            filehash="test222324", original_filename="test8.pdf", local_filename="/tmp/test8.pdf", file_size=131072
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "pending"
        assert status["has_errors"] is False
        assert status["total_steps"] == len(MAIN_PROCESSING_STEPS)
        assert status["completed_steps"] == 0
        assert status["in_progress_steps"] == 0

    def test_get_file_overall_status_processing(self, db_session: Session):
        """Test overall status for a file with in-progress steps."""
        file_record = FileRecord(
            filehash="test252627", original_filename="test9.pdf", local_filename="/tmp/test9.pdf", file_size=262144
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Mark some steps as complete and one as in progress
        update_step_status(db_session, file_record.id, "create_file_record", "success")
        update_step_status(db_session, file_record.id, "check_text", "success")
        update_step_status(db_session, file_record.id, "extract_text", "in_progress")

        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "processing"
        assert status["has_errors"] is False
        assert status["completed_steps"] == 2
        assert status["in_progress_steps"] == 1

    def test_get_file_overall_status_completed(self, db_session: Session):
        """Test overall status for a completed file."""
        file_record = FileRecord(
            filehash="test282930", original_filename="test10.pdf", local_filename="/tmp/test10.pdf", file_size=524288
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Mark all steps as success
        for step_name in MAIN_PROCESSING_STEPS:
            update_step_status(db_session, file_record.id, step_name, "success")

        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "completed"
        assert status["has_errors"] is False
        assert status["completed_steps"] == len(MAIN_PROCESSING_STEPS)
        assert status["in_progress_steps"] == 0

    def test_get_file_overall_status_completed_with_pending_intermediate_steps(self, db_session: Session):
        """Test that a file is 'completed' when the terminal step succeeds even if some intermediate steps are pending.

        This covers the scenario where steps like check_for_duplicates or
        extract_text are left in 'pending' because the dynamic pipeline
        skipped them without explicitly marking them (e.g. dedup log written
        before file_id was available, or extract_text not marked for non-PDF).
        """
        file_record = FileRecord(
            filehash="test_terminal_complete",
            original_filename="terminal.pdf",
            local_filename="/tmp/terminal.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Simulate a pipeline where most steps succeed but check_for_duplicates
        # stays pending (the exact scenario from the bug report).
        for step_name in MAIN_PROCESSING_STEPS:
            if step_name == "check_for_duplicates":
                continue  # Leave this as "pending"
            update_step_status(db_session, file_record.id, step_name, "success")

        # Also add a dynamically created OCR step as "skipped"
        update_step_status(db_session, file_record.id, "process_with_ocr", "skipped")

        status = get_file_overall_status(db_session, file_record.id)

        # The terminal step (send_to_all_destinations) succeeded, so the
        # file should be "completed" despite check_for_duplicates being pending.
        assert status["status"] == "completed"
        assert status["has_errors"] is False

    def test_get_file_overall_status_pending_without_terminal_step(self, db_session: Session):
        """Test that a file stays 'pending' when the terminal step hasn't been recorded."""
        file_record = FileRecord(
            filehash="test_no_terminal",
            original_filename="no_terminal.pdf",
            local_filename="/tmp/no_terminal.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Only first few steps completed - terminal step is still pending
        update_step_status(db_session, file_record.id, "create_file_record", "success")
        update_step_status(db_session, file_record.id, "check_text", "success")
        update_step_status(db_session, file_record.id, "extract_text", "success")

        status = get_file_overall_status(db_session, file_record.id)

        # Terminal step hasn't run yet, so file should remain pending
        assert status["status"] == "pending"
        assert status["has_errors"] is False
        assert status["completed_steps"] == 3

    def test_get_file_overall_status_failed(self, db_session: Session):
        """Test overall status for a file with failed steps."""
        file_record = FileRecord(
            filehash="test313233", original_filename="test11.pdf", local_filename="/tmp/test11.pdf", file_size=1048576
        )
        db_session.add(file_record)
        db_session.commit()

        initialize_file_steps(db_session, file_record.id)

        # Mark some steps as success and one as failure
        update_step_status(db_session, file_record.id, "create_file_record", "success")
        update_step_status(db_session, file_record.id, "check_text", "success")
        update_step_status(db_session, file_record.id, "extract_text", "failure", error_message="OCR failed")

        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "failed"
        assert status["has_errors"] is True
        assert status["failed_steps"] == 1

    def test_get_step_summary(self, db_session: Session):
        """Test getting step summary with counts."""
        file_record = FileRecord(
            filehash="test343536", original_filename="test12.pdf", local_filename="/tmp/test12.pdf", file_size=2097152
        )
        db_session.add(file_record)
        db_session.commit()

        # Initialize main steps and add upload steps
        initialize_file_steps(db_session, file_record.id)
        add_upload_steps(db_session, file_record.id, ["dropbox", "s3", "nextcloud"])

        # Update statuses
        update_step_status(db_session, file_record.id, "create_file_record", "success")
        update_step_status(db_session, file_record.id, "check_text", "success")
        update_step_status(db_session, file_record.id, "extract_text", "in_progress")
        update_step_status(db_session, file_record.id, "upload_to_dropbox", "success")
        update_step_status(db_session, file_record.id, "upload_to_s3", "failure")
        update_step_status(db_session, file_record.id, "upload_to_nextcloud", "in_progress")

        summary = get_step_summary(db_session, file_record.id)

        # Check main step counts
        assert summary["main"]["success"] == 2
        assert summary["main"]["in_progress"] == 1
        assert summary["main"]["queued"] >= 5  # Remaining pending steps

        # Check upload counts (only upload_to_* steps, not queue_* steps)
        assert summary["uploads"]["success"] == 1
        assert summary["uploads"]["failure"] == 1
        assert summary["uploads"]["in_progress"] == 1

        assert summary["total_main_steps"] == len(MAIN_PROCESSING_STEPS)
        assert summary["total_upload_tasks"] == 3  # 3 upload_to_* steps counted

    def test_get_file_overall_status_duplicate_file(self, db_session: Session):
        """Test overall status returns 'duplicate' immediately for duplicate files."""
        file_record = FileRecord(
            filehash="test_dup01",
            original_filename="dup.pdf",
            local_filename="/tmp/dup.pdf",
            file_size=1024,
            is_duplicate=True,
        )
        db_session.add(file_record)
        db_session.commit()

        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "duplicate"
        assert status["has_errors"] is False
        assert status["total_steps"] == 0
        assert status["completed_steps"] == 0
        assert status["failed_steps"] == 0
        assert status["in_progress_steps"] == 0
        assert status["skipped_steps"] == 0

    def test_get_file_overall_status_no_steps_initialized(self, db_session: Session):
        """Test overall status returns 'pending' with zero counts when no steps exist."""
        file_record = FileRecord(
            filehash="test_nosteps",
            original_filename="nosteps.pdf",
            local_filename="/tmp/nosteps.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        # Do NOT initialize any steps
        status = get_file_overall_status(db_session, file_record.id)

        assert status["status"] == "pending"
        assert status["has_errors"] is False
        assert status["total_steps"] == 0
        assert status["completed_steps"] == 0

    def test_get_file_overall_status_all_success_without_terminal_step(self, db_session: Session):
        """Test overall status stays 'pending' when all steps succeed but terminal step is absent."""
        file_record = FileRecord(
            filehash="test_no_terminal2",
            original_filename="no_terminal2.pdf",
            local_filename="/tmp/no_terminal2.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        # Add only non-terminal steps as success (no TERMINAL_STEP = send_to_all_destinations)
        for step_name in ["create_file_record", "check_text", "extract_text"]:
            step = FileProcessingStep(file_id=file_record.id, step_name=step_name, status="success")
            db_session.add(step)
        db_session.commit()

        status = get_file_overall_status(db_session, file_record.id)

        # All counted steps are success/skipped, but terminal step missing → pending
        assert status["status"] == "pending"
        assert status["has_errors"] is False
        assert status["completed_steps"] == 3

    def test_get_file_overall_status_dedup_disabled(self, db_session: Session):
        """Test that check_for_duplicates is excluded from real steps when dedup is disabled."""
        file_record = FileRecord(
            filehash="test_dedup_off",
            original_filename="dedup_off.pdf",
            local_filename="/tmp/dedup_off.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        # Add check_for_duplicates step as success and terminal step as success
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="check_for_duplicates", status="success"))
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name=TERMINAL_STEP, status="success"))
        db_session.commit()

        with patch.object(settings, "enable_deduplication", False):
            status = get_file_overall_status(db_session, file_record.id)

        # check_for_duplicates should not be counted; only send_to_all_destinations counts
        assert status["status"] == "completed"
        assert status["total_steps"] == 1  # Only the terminal step
        assert status["completed_steps"] == 1

    def test_get_step_summary_dedup_disabled(self, db_session: Session):
        """Test that get_step_summary excludes check_for_duplicates when dedup is disabled."""
        file_record = FileRecord(
            filehash="test_sum_dedup_off",
            original_filename="sum_dedup_off.pdf",
            local_filename="/tmp/sum_dedup_off.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="check_for_duplicates", status="success"))
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name=TERMINAL_STEP, status="success"))
        db_session.commit()

        with patch.object(settings, "enable_deduplication", False):
            summary = get_step_summary(db_session, file_record.id)

        # check_for_duplicates should not be counted; only terminal step as a main step
        assert summary["main"]["success"] == 1
        assert summary["total_main_steps"] == 1

    def test_add_upload_steps_idempotent(self, db_session: Session):
        """Test that add_upload_steps does not create duplicate steps if called twice."""
        file_record = FileRecord(
            filehash="test_idem01",
            original_filename="idem.pdf",
            local_filename="/tmp/idem.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        destinations = ["dropbox", "s3"]
        add_upload_steps(db_session, file_record.id, destinations)
        add_upload_steps(db_session, file_record.id, destinations)  # Second call should be a no-op

        steps = db_session.query(FileProcessingStep).filter(FileProcessingStep.file_id == file_record.id).all()

        # Only 2 steps per destination (queue_ and upload_to_), NOT 4
        assert len(steps) == len(destinations) * 2

    def test_get_step_summary_internal_step_filtered(self, db_session: Session):
        """Test that non-real internal steps (e.g. poll_task) are ignored in get_step_summary."""
        file_record = FileRecord(
            filehash="test_internal01",
            original_filename="internal.pdf",
            local_filename="/tmp/internal.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        # Add a real step and an internal/diagnostic step
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name=TERMINAL_STEP, status="success"))
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="poll_task", status="success"))
        db_session.commit()

        summary = get_step_summary(db_session, file_record.id)

        # poll_task is not a real step and must be filtered out
        assert summary["total_main_steps"] == 1  # Only TERMINAL_STEP
        assert summary["main"]["success"] == 1

    def test_get_step_summary_unusual_upload_status(self, db_session: Session):
        """Test get_step_summary with an upload step whose status is not in the counts dict."""
        file_record = FileRecord(
            filehash="test_unk_upload",
            original_filename="unk_upload.pdf",
            local_filename="/tmp/unk_upload.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        db_session.add(FileProcessingStep(file_id=file_record.id, step_name=TERMINAL_STEP, status="success"))
        # "cancelled" is not in the upload_counts dict keys
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="upload_to_dropbox", status="cancelled"))
        db_session.commit()

        summary = get_step_summary(db_session, file_record.id)

        # The upload step is still counted in total_upload_tasks even with an unusual status
        assert summary["total_upload_tasks"] == 1
        # "cancelled" not in counts, so no key incremented
        assert summary["uploads"]["success"] == 0
        assert summary["uploads"]["failure"] == 0

    def test_get_step_summary_unusual_main_status(self, db_session: Session):
        """Test get_step_summary with a main step whose status is not in the counts dict."""
        file_record = FileRecord(
            filehash="test_unk_main",
            original_filename="unk_main.pdf",
            local_filename="/tmp/unk_main.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        db_session.add(FileProcessingStep(file_id=file_record.id, step_name=TERMINAL_STEP, status="success"))
        # "cancelled" is not in the main_counts dict keys
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="create_file_record", status="cancelled"))
        db_session.commit()

        summary = get_step_summary(db_session, file_record.id)

        # The main step is still counted in total_main_steps even with an unusual status
        assert summary["total_main_steps"] == 2  # terminal + create_file_record
        # "cancelled" not in counts, so no key incremented beyond terminal step's success
        assert summary["main"]["success"] == 1
        assert summary["main"]["queued"] == 0

    def test_get_step_summary_no_terminal_step_in_db(self, db_session: Session):
        """Test that get_step_summary adds terminal step as queued when it is absent from DB."""
        file_record = FileRecord(
            filehash="test_no_term_sum",
            original_filename="no_term_sum.pdf",
            local_filename="/tmp/no_term_sum.pdf",
            file_size=1024,
        )
        db_session.add(file_record)
        db_session.commit()

        # Add only non-terminal main steps
        db_session.add(FileProcessingStep(file_id=file_record.id, step_name="create_file_record", status="success"))
        db_session.commit()

        summary = get_step_summary(db_session, file_record.id)

        # Terminal step absent → automatically added as queued (exactly one queued, two total)
        assert summary["main"]["queued"] == 1
        assert summary["total_main_steps"] == 2  # create_file_record + virtual terminal step