"""Tests for the logging configuration and structured log emission."""

from __future__ import annotations

import io
import json
import logging
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

from zsgdp.logging_config import configure_logging, get_logger
from zsgdp.pipeline import parse_document


class ConfigureLoggingTests(unittest.TestCase):
    def setUp(self) -> None:
        # Reset between tests so each one configures cleanly.
        root = logging.getLogger("zsgdp")
        for handler in list(root.handlers):
            root.removeHandler(handler)

    def test_idempotent_configuration(self):
        stream = io.StringIO()
        configure_logging(level="INFO", json_format=False, stream=stream)
        configure_logging(level="INFO", json_format=False, stream=stream)
        root = logging.getLogger("zsgdp")
        # Idempotent: still exactly one handler attached.
        self.assertEqual(len(root.handlers), 1)

    def test_text_format_emits_human_readable(self):
        stream = io.StringIO()
        configure_logging(level="INFO", json_format=False, stream=stream)
        get_logger("zsgdp.test").info("hello", extra={"doc_id": "d1"})
        output = stream.getvalue()
        self.assertIn("INFO", output)
        self.assertIn("zsgdp.test", output)
        self.assertIn("hello", output)

    def test_json_format_emits_one_line_records(self):
        stream = io.StringIO()
        configure_logging(level="INFO", json_format=True, stream=stream)
        get_logger("zsgdp.test").info("event", extra={"doc_id": "abc", "count": 3})
        output = stream.getvalue().strip()
        record = json.loads(output)
        self.assertEqual(record["level"], "INFO")
        self.assertEqual(record["logger"], "zsgdp.test")
        self.assertEqual(record["message"], "event")
        self.assertEqual(record["doc_id"], "abc")
        self.assertEqual(record["count"], 3)

    def test_default_level_is_warning(self):
        stream = io.StringIO()
        with patch.dict("os.environ", {"ZSGDP_LOG_LEVEL": "", "ZSGDP_LOG_JSON": ""}, clear=False):
            configure_logging(stream=stream)
            get_logger("zsgdp.test").info("hidden_at_default_level")
            self.assertNotIn("hidden_at_default_level", stream.getvalue())
            get_logger("zsgdp.test").warning("visible_at_default_level")
            self.assertIn("visible_at_default_level", stream.getvalue())

    def test_get_logger_namespacing(self):
        self.assertEqual(get_logger().name, "zsgdp")
        self.assertEqual(get_logger("zsgdp.foo").name, "zsgdp.foo")
        # Bare names get prefixed.
        self.assertEqual(get_logger("foo").name, "zsgdp.foo")


class PipelineLogEmissionTests(unittest.TestCase):
    def test_parse_emits_start_and_end_records(self):
        # Reset handlers so assertLogs works against the named logger.
        root = logging.getLogger("zsgdp")
        for handler in list(root.handlers):
            root.removeHandler(handler)
        root.setLevel(logging.DEBUG)
        root.propagate = True

        with tempfile.TemporaryDirectory() as tmp:
            input_path = Path(tmp) / "doc.md"
            input_path.write_text("# Doc\n\nHello.\n", encoding="utf-8")

            with self.assertLogs("zsgdp.pipeline", level="INFO") as captured:
                parse_document(input_path, Path(tmp) / "out")

        messages = [record.message for record in captured.records]
        self.assertIn("parse_start", messages)
        self.assertIn("parse_end", messages)

        # Find a parse_end record and assert structured fields are present.
        parse_end = next(record for record in captured.records if record.message == "parse_end")
        self.assertTrue(hasattr(parse_end, "doc_id"))
        self.assertTrue(hasattr(parse_end, "elapsed_seconds"))
        self.assertTrue(hasattr(parse_end, "quality_score"))
        self.assertTrue(hasattr(parse_end, "element_count"))


class RepairLogEmissionTests(unittest.TestCase):
    def test_repair_emits_iteration_record(self):
        root = logging.getLogger("zsgdp")
        for handler in list(root.handlers):
            root.removeHandler(handler)
        root.setLevel(logging.DEBUG)
        root.propagate = True

        with tempfile.TemporaryDirectory() as tmp:
            input_path = Path(tmp) / "report.md"
            # Malformed table forces a repair iteration.
            input_path.write_text(
                "# Report\n\n| A | B |\n| --- | --- |\n| 1 | 2 | 3 |\n",
                encoding="utf-8",
            )

            with self.assertLogs("zsgdp.repair.controller", level="INFO") as captured:
                parse_document(input_path, Path(tmp) / "out")

        repair_records = [r for r in captured.records if r.message == "repair_iteration"]
        self.assertGreaterEqual(len(repair_records), 1)
        # Each record carries the iteration index.
        for record in repair_records:
            self.assertTrue(hasattr(record, "iteration"))
            self.assertTrue(hasattr(record, "status"))


if __name__ == "__main__":
    unittest.main()