from __future__ import annotations

import json
import tempfile
import unittest
from datetime import date
from pathlib import Path
from typing import Optional

from company_reports.contracts import BatchSnapshot, ErrorCode
from company_reports.core import build_company_report
from company_reports.publishing import (
    AtomicReportPublisher,
    BuiltWorkbook,
    PublicationError,
    sha256_file,
)
from company_reports.repository import FileMetadata, RepositoryError, ReservedReport


class FakeRepository:
    def __init__(self, fail_activation: bool = False):
        self.fail_activation = fail_activation
        self.activated: Optional[tuple] = None
        self.failed: Optional[tuple] = None

    def activate_report(
        self,
        reservation: ReservedReport,
        artifact: FileMetadata,
        result_json: FileMetadata,
    ) -> None:
        if self.fail_activation:
            raise RepositoryError(ErrorCode.PUBLISH_FAILED, "synthetic activation failed")
        self.activated = (reservation, artifact, result_json)

    def mark_failed(
        self,
        reservation: ReservedReport,
        code: str,
        safe_message: str,
    ) -> None:
        self.failed = (reservation, code, safe_message)


def empty_report():
    return build_company_report(
        "HanaTour",
        2026,
        7,
        date(2026, 7, 10),
        BatchSnapshot((), (), (), {}),
    )


class CompanyReportPublishingTests(unittest.TestCase):
    def test_publish_archives_prior_current_and_activates_new_version(self):
        with tempfile.TemporaryDirectory(prefix="company-report-publish-test-") as temp_dir:
            project_root = Path(temp_dir) / "project"
            output_root = project_root / "outputs" / "company_reports"
            work_dir = project_root / "staging"
            project_root.mkdir(parents=True)
            work_dir.mkdir()
            report = empty_report()
            month_root = output_root / "2026" / "07"
            month_root.mkdir(parents=True)
            current = month_root / report.filename
            current.write_bytes(b"synthetic-old-workbook")
            built_path = work_dir / report.filename
            built_path.write_bytes(b"synthetic-new-workbook")
            built = BuiltWorkbook(
                path=built_path,
                sha256=sha256_file(built_path),
                byte_size=built_path.stat().st_size,
                summary={},
            )
            reservation = ReservedReport(44, 2, report.company)
            repository = FakeRepository()
            publisher = AtomicReportPublisher(project_root, output_root)

            outcome = publisher.publish(
                report, reservation, built, repository, work_dir
            )

            self.assertEqual(current.read_bytes(), b"synthetic-new-workbook")
            self.assertEqual(outcome.archive_path.read_bytes(), b"synthetic-new-workbook")
            legacy = list((month_root / "archive" / "legacy").rglob(report.filename))
            self.assertEqual(len(legacy), 1)
            self.assertEqual(legacy[0].read_bytes(), b"synthetic-old-workbook")
            self.assertEqual(current.stat().st_mode & 0o777, 0o600)
            result = json.loads(outcome.result_path.read_text(encoding="utf-8"))
            self.assertEqual(result["status"], "success")
            self.assertEqual(result["row_count"], 0)
            self.assertNotIn("group_code", outcome.result_path.read_text(encoding="utf-8").lower())
            self.assertIsNotNone(repository.activated)
            artifact = repository.activated[1]
            self.assertEqual(
                artifact.storage_key,
                "outputs/company_reports/2026/07/archive/v0002/HanaTour-July-2026.xlsx",
            )
            self.assertIsNone(repository.failed)

    def test_activation_failure_restores_prior_current_and_removes_new_version_files(self):
        with tempfile.TemporaryDirectory(prefix="company-report-publish-test-") as temp_dir:
            project_root = Path(temp_dir) / "project"
            output_root = project_root / "outputs" / "company_reports"
            work_dir = project_root / "staging"
            project_root.mkdir(parents=True)
            work_dir.mkdir()
            report = empty_report()
            month_root = output_root / "2026" / "07"
            month_root.mkdir(parents=True)
            current = month_root / report.filename
            current.write_bytes(b"synthetic-old-workbook")
            built_path = work_dir / report.filename
            built_path.write_bytes(b"synthetic-new-workbook")
            built = BuiltWorkbook(
                path=built_path,
                sha256=sha256_file(built_path),
                byte_size=built_path.stat().st_size,
                summary={},
            )
            reservation = ReservedReport(45, 3, report.company)
            repository = FakeRepository(fail_activation=True)
            publisher = AtomicReportPublisher(project_root, output_root)

            with self.assertRaises(PublicationError) as caught:
                publisher.publish(report, reservation, built, repository, work_dir)

            self.assertEqual(caught.exception.code, ErrorCode.PUBLISH_FAILED)
            self.assertEqual(current.read_bytes(), b"synthetic-old-workbook")
            version_root = month_root / "archive" / "v0003"
            self.assertFalse((version_root / report.filename).exists())
            self.assertFalse((version_root / "HanaTour-v0003.result.json").exists())
            self.assertEqual(repository.failed[0], reservation)
            self.assertEqual(repository.failed[1], ErrorCode.PUBLISH_FAILED)


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