from __future__ import annotations

import asyncio
import json
from pathlib import Path
import sys
import tempfile
import unittest


ROOT = Path(__file__).resolve().parents[2]
sys.path.insert(0, str(ROOT / "backend"))

from app.cad_agent.adapters.author_guidance import FileAuthorGuidance  # noqa: E402
from app.cad_agent.application.workflow import ModelIdentity, WorkflowConfig, WorkflowCoordinator  # noqa: E402
from app.cad_agent.domain.errors import ErrorCode, WorkflowError  # noqa: E402
from app.cad_agent.domain.state import TaskPhase, TaskState  # noqa: E402


GUIDANCE_ROOT = ROOT / "backend" / "agent" / "skills" / "cdsl-author-guidance"
PROFILE = ROOT / "backend" / "engine" / "cdsl_engine" / "profile_schema.json"


def atomic_ids() -> tuple[str, ...]:
    return tuple(json.loads(PROFILE.read_text(encoding="utf-8"))["operation_contracts"])


class _Repository:
    def __init__(self, state: TaskState) -> None:
        self.state = state
        self.usage_records: list[dict] = []

    def get_state(self, _task_id: str) -> TaskState:
        return self.state

    def ledger_events(self, _task_id: str) -> list[dict]:
        return []

    def record_usage(self, _task_id: str, payload: dict) -> None:
        self.usage_records.append(payload)

    def record_tool_audit(self, _task_id: str, _payload: dict) -> None:
        pass


class _Artifacts:
    def read_source_requirements(self, _task_id: str) -> str:
        return "Create a symmetric mounting plate."

    def read_json(self, *_args: object) -> None:
        return None


class _Runtime:
    def supported_atomic_ids(self) -> tuple[str, ...]:
        return atomic_ids()


class AuthorGuidanceTests(unittest.TestCase):
    def test_manifest_covers_every_runtime_atomic_and_keeps_coordinate_core_at_minimum_budget(self) -> None:
        guidance = FileAuthorGuidance(GUIDANCE_ROOT, max_chars=1_200)
        covered: set[str] = set()
        for atomic_id in atomic_ids():
            selection = guidance.select(
                phase=TaskPhase.FEATURE_PENDING,
                atomic_id=atomic_id,
                repair_required=False,
                supported_atomic_ids=atomic_ids(),
            )
            self.assertTrue(selection.enabled, selection.fallback_reason)
            self.assertIn("00-author-contract", selection.section_ids)
            self.assertIn("03-coordinate-system-and-datums", selection.section_ids)
            self.assertLessEqual(len(selection.content), 1_200)
            self.assertIn("世界坐标", selection.content)
            covered.update(section_id for section_id in selection.section_ids if section_id.startswith("op-"))
        self.assertEqual(covered, {"op-extrude-add", "op-extrude-cut", "op-loft", "op-revolve", "op-hole", "op-reference", "op-pattern", "op-finish", "op-sphere", "op-primitives", "op-thread", "op-bend", "op-gear"})

    def test_phase_repair_and_budget_selection_are_stable(self) -> None:
        guidance = FileAuthorGuidance(GUIDANCE_ROOT, max_chars=3_600)
        planning = guidance.select(
            phase=TaskPhase.COMPILING_FEATURE_PLAN,
            atomic_id="",
            repair_required=False,
            supported_atomic_ids=atomic_ids(),
        )
        repair = guidance.select(
            phase=TaskPhase.AWAITING_ACTION,
            atomic_id="fillet",
            repair_required=True,
            supported_atomic_ids=atomic_ids(),
        )
        self.assertEqual(planning.section_ids[:2], ("00-author-contract", "03-coordinate-system-and-datums"))
        self.assertIn("02-parameters-and-derived-dimensions", planning.section_ids)
        self.assertEqual(repair.section_ids[:3], ("00-author-contract", "03-coordinate-system-and-datums", "op-finish"))
        self.assertIn("10-repair-and-best-effort", repair.section_ids)

    def test_disabled_missing_and_invalid_corpus_fall_back_without_authoring_failure(self) -> None:
        common = {
            "phase": TaskPhase.FEATURE_PENDING,
            "atomic_id": "extrude_add_blind",
            "repair_required": False,
            "supported_atomic_ids": atomic_ids(),
        }
        self.assertEqual(FileAuthorGuidance(GUIDANCE_ROOT, enabled=False).select(**common).fallback_reason, "guidance_disabled")
        with tempfile.TemporaryDirectory() as temporary:
            root = Path(temporary)
            self.assertEqual(FileAuthorGuidance(root).select(**common).fallback_reason, "guidance_load_failed:FileNotFoundError")
            (root / "manifest.json").write_text("{}", encoding="utf-8")
            self.assertEqual(FileAuthorGuidance(root).select(**common).fallback_reason, "guidance_load_failed:ValueError")

    def test_author_context_receives_guidance_but_keeps_the_existing_tool_instruction(self) -> None:
        state = TaskState("cad_123456abcdef", TaskPhase.DRAFTING_REQUIREMENTS_DOCUMENT, 1)
        workflow = WorkflowCoordinator(
            WorkflowConfig(max_turns=8, format_error_limit=2),
            _Repository(state),
            _Artifacts(),
            _Runtime(),
            object(),
            object(),
            object(),
            object(),
            FileAuthorGuidance(GUIDANCE_ROOT),
        )
        messages, selection = workflow._author_context(state.task_id, [])
        system = str(messages[0]["content"])
        self.assertTrue(selection.enabled)
        self.assertIn("Use exactly one offered structured tool call", system)
        self.assertIn("Coordinate System And Datums", system)
        self.assertIn("世界坐标", system)

    def test_invalid_author_tool_call_retains_guidance_usage_metadata(self) -> None:
        state = TaskState("cad_123456abcdef", TaskPhase.DRAFTING_REQUIREMENTS_DOCUMENT, 1)
        repository = _Repository(state)
        class _Models:
            async def call_tool(self, **_kwargs: object) -> dict:
                return {"tool_calls": [], "usage": {"prompt_tokens": 3, "completion_tokens": 1, "total_tokens": 4}}
        workflow = WorkflowCoordinator(
            WorkflowConfig(max_turns=8, format_error_limit=2),
            repository,
            _Artifacts(),
            _Runtime(),
            _Models(),
            object(),
            object(),
            object(),
            FileAuthorGuidance(GUIDANCE_ROOT),
        )
        tool = {"type": "function", "function": {"name": "write_requirements_document", "parameters": {"type": "object"}}}
        result = asyncio.run(workflow._author_turn(state.task_id, ModelIdentity("provider", "model"), [tool], []))
        self.assertIsInstance(result, WorkflowError)
        self.assertEqual(result.code, ErrorCode.AUTHOR_FORMAT_INVALID)
        self.assertEqual(repository.usage_records[0]["guidance_enabled"], True)
        self.assertIn("03-coordinate-system-and-datums", repository.usage_records[0]["guidance_section_ids"])
        self.assertEqual(repository.usage_records[0]["retry_reason"], "invalid_tool_call")


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