"""Repository layer for database access."""

from typing import Optional

from sqlmodel import Session, select

from agenteval.models import Case, EvalResult, EvalRun, EvalTarget, Scenario
from agenteval.storage.db import (
    EvalResultDB,
    EvalRunDB,
    EvalTargetDB,
    ScenarioDB,
    TurnDB,
    get_session,
    utc_now,
)


def _target_to_db(target: EvalTarget) -> EvalTargetDB:
    db = EvalTargetDB(
        id=target.id,
        name=target.name,
        description=target.description,
        platform=target.platform.value,
        channel_type=target.channel_type.value,
        status=target.status.value,
        created_at=target.created_at,
        updated_at=target.updated_at or utc_now(),
    )
    db.set_config(target.channel_config)
    return db


def _target_from_db(db: EvalTargetDB) -> EvalTarget:
    return EvalTarget(
        id=db.id,
        name=db.name,
        description=db.description,
        platform=db.platform,
        channel_type=db.channel_type,
        channel_config=db.get_config(),
        status=db.status,
        created_at=db.created_at,
        updated_at=db.updated_at,
    )


def _scenario_to_db(scenario: Scenario) -> ScenarioDB:
    db = ScenarioDB(
        id=scenario.id,
        name=scenario.name,
        description=scenario.description,
        created_at=scenario.created_at,
        updated_at=scenario.updated_at or utc_now(),
    )
    db.set_tags(scenario.tags)
    db.set_cases([case.model_dump() for case in scenario.cases])
    db.set_llm_config(scenario.llm_config)
    return db


def _scenario_from_db(db: ScenarioDB) -> Scenario:
    return Scenario(
        id=db.id,
        name=db.name,
        description=db.description,
        tags=db.get_tags(),
        cases=[Case(**case) for case in db.get_cases()],
        llm_config=db.get_llm_config(),
        created_at=db.created_at,
        updated_at=db.updated_at,
    )


def _run_to_db(run: EvalRun) -> EvalRunDB:
    db = EvalRunDB(
        id=run.id,
        target_id=run.target_id,
        scenario_id=run.scenario_id,
        status=run.status.value,
        started_at=run.started_at,
        completed_at=run.completed_at,
    )
    if run.summary:
        db.set_summary(run.summary)
    return db


def _run_from_db(db: EvalRunDB) -> EvalRun:
    return EvalRun(
        id=db.id,
        target_id=db.target_id,
        scenario_id=db.scenario_id,
        status=db.status,
        started_at=db.started_at,
        completed_at=db.completed_at,
        summary=db.get_summary(),
    )


def _result_to_db(result: EvalResult) -> EvalResultDB:
    return EvalResultDB(
        id=result.id,
        run_id=result.run_id,
        case_id=result.case_id,
        turn_id=result.turn_id,
        rule_type=result.rule_type,
        passed=result.passed,
        score=result.score,
        reason=result.reason,
    )


def _result_from_db(db: EvalResultDB) -> EvalResult:
    return EvalResult(
        id=db.id,
        run_id=db.run_id,
        case_id=db.case_id,
        turn_id=db.turn_id,
        rule_type=db.rule_type,
        passed=db.passed,
        score=db.score,
        reason=db.reason,
    )


class TargetRepository:
    """Repository for evaluation targets."""

    def __init__(self, session: Optional[Session] = None):
        self.session = session or get_session()

    def list_all(self) -> list[EvalTarget]:
        statement = select(EvalTargetDB).order_by(EvalTargetDB.created_at.desc())
        return [_target_from_db(r) for r in self.session.exec(statement).all()]

    def get(self, target_id: str) -> Optional[EvalTarget]:
        db = self.session.get(EvalTargetDB, target_id)
        return _target_from_db(db) if db else None

    def create(self, target: EvalTarget) -> EvalTarget:
        db = _target_to_db(target)
        self.session.add(db)
        self.session.commit()
        self.session.refresh(db)
        return _target_from_db(db)

    def update(self, target: EvalTarget) -> Optional[EvalTarget]:
        existing = self.session.get(EvalTargetDB, target.id)
        if not existing:
            return None
        existing.name = target.name
        existing.description = target.description
        existing.platform = target.platform.value
        existing.channel_type = target.channel_type.value
        existing.status = target.status.value
        existing.set_config(target.channel_config)
        existing.updated_at = utc_now()
        self.session.add(existing)
        self.session.commit()
        self.session.refresh(existing)
        return _target_from_db(existing)

    def delete(self, target_id: str) -> bool:
        db = self.session.get(EvalTargetDB, target_id)
        if not db:
            return False
        self.session.delete(db)
        self.session.commit()
        return True


class ScenarioRepository:
    """Repository for evaluation scenarios."""

    def __init__(self, session: Optional[Session] = None):
        self.session = session or get_session()

    def list_all(self) -> list[Scenario]:
        statement = select(ScenarioDB).order_by(ScenarioDB.created_at.desc())
        return [_scenario_from_db(r) for r in self.session.exec(statement).all()]

    def get(self, scenario_id: str) -> Optional[Scenario]:
        db = self.session.get(ScenarioDB, scenario_id)
        return _scenario_from_db(db) if db else None

    def create(self, scenario: Scenario) -> Scenario:
        db = _scenario_to_db(scenario)
        self.session.add(db)
        self.session.commit()
        self.session.refresh(db)
        return _scenario_from_db(db)

    def update(self, scenario: Scenario) -> Optional[Scenario]:
        existing = self.session.get(ScenarioDB, scenario.id)
        if not existing:
            return None
        existing.name = scenario.name
        existing.description = scenario.description
        existing.set_tags(scenario.tags)
        existing.set_cases([case.model_dump() for case in scenario.cases])
        existing.set_llm_config(scenario.llm_config)
        existing.updated_at = utc_now()
        self.session.add(existing)
        self.session.commit()
        self.session.refresh(existing)
        return _scenario_from_db(existing)

    def delete(self, scenario_id: str) -> bool:
        db = self.session.get(ScenarioDB, scenario_id)
        if not db:
            return False
        self.session.delete(db)
        self.session.commit()
        return True


class RunRepository:
    """Repository for evaluation runs."""

    def __init__(self, session: Optional[Session] = None):
        self.session = session or get_session()

    def list_all(self) -> list[EvalRun]:
        statement = select(EvalRunDB).order_by(EvalRunDB.started_at.desc())
        return [_run_from_db(r) for r in self.session.exec(statement).all()]

    def get(self, run_id: str) -> Optional[EvalRun]:
        db = self.session.get(EvalRunDB, run_id)
        return _run_from_db(db) if db else None

    def create(self, run: EvalRun) -> EvalRun:
        db = _run_to_db(run)
        self.session.add(db)
        self.session.commit()
        self.session.refresh(db)
        return _run_from_db(db)

    def update(self, run: EvalRun) -> Optional[EvalRun]:
        existing = self.session.get(EvalRunDB, run.id)
        if not existing:
            return None
        existing.target_id = run.target_id
        existing.scenario_id = run.scenario_id
        existing.status = run.status.value
        existing.completed_at = run.completed_at
        if run.summary:
            existing.set_summary(run.summary)
        self.session.add(existing)
        self.session.commit()
        self.session.refresh(existing)
        return _run_from_db(existing)

    def get_turns(self, run_id: str) -> list[TurnDB]:
        statement = select(TurnDB).where(TurnDB.run_id == run_id).order_by(TurnDB.sent_at)
        return list(self.session.exec(statement).all())

    def get_results(self, run_id: str) -> list[EvalResult]:
        statement = select(EvalResultDB).where(EvalResultDB.run_id == run_id)
        return [_result_from_db(r) for r in self.session.exec(statement).all()]

    def delete(self, run_id: str) -> bool:
        """Delete a run. ORM-level cascade removes associated turns/results."""
        db = self.session.get(EvalRunDB, run_id)
        if not db:
            return False
        self.session.delete(db)
        self.session.commit()
        return True


class ResultRepository:
    """Repository for evaluation results."""

    def __init__(self, session: Optional[Session] = None):
        self.session = session or get_session()

    def save_turn(self, turn) -> TurnDB:
        db = TurnDB(
            id=turn.id,
            run_id=turn.run_id,
            case_id=turn.case_id,
            round_index=turn.round_index,
            question_msg_id=turn.question_msg_id,
            sent_at=turn.sent_at,
            received_at=turn.received_at,
            latency_ms=turn.latency_ms,
        )
        db.set_sent_message(turn.sent_message)
        db.set_reply(turn.reply)
        self.session.add(db)
        self.session.commit()
        self.session.refresh(db)
        return db

    def save_result(self, result: EvalResult) -> EvalResult:
        db = _result_to_db(result)
        self.session.add(db)
        self.session.commit()
        self.session.refresh(db)
        return _result_from_db(db)