"""Contract API endpoints."""
from typing import Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.models.contract import ContractStatus
from app.schemas.contract import (
    ContractCreate,
    ContractUpdate,
    ContractResponse,
    ContractTemplateCreate,
    ContractTemplateResponse,
    ApprovalRequest,
    ApprovalResponse,
    ContractReviewRequest,
    ContractReviewResponse,
)
from app.services.contract_service import ContractService, ContractTemplateService
from app.services.llm_service import llm_service

router = APIRouter(prefix="/contracts", tags=["contracts"])


@router.post("", response_model=ContractResponse)
async def create_contract(
    contract_data: ContractCreate,
    user_id: int = 1,  # TODO: Get from auth
    db: AsyncSession = Depends(get_db),
):
    """Create a new contract."""
    service = ContractService(db)
    contract = await service.create_contract(
        created_by=user_id,
        **contract_data.model_dump(exclude={"template_id"}),
        template_id=contract_data.template_id,
    )
    return contract


@router.get("", response_model=list[ContractResponse])
async def list_contracts(
    skip: int = Query(0, ge=0),
    limit: int = Query(20, ge=1, le=100),
    status: Optional[str] = Query(None),
    user_id: int = 1,  # TODO: Get from auth
    db: AsyncSession = Depends(get_db),
):
    """List contracts."""
    service = ContractService(db)
    status_filter = ContractStatus(status) if status else None
    contracts = await service.get_contracts_list(skip, limit, status_filter, user_id)
    return contracts


@router.get("/{contract_id}", response_model=ContractResponse)
async def get_contract(
    contract_id: int,
    db: AsyncSession = Depends(get_db),
):
    """Get a contract by ID."""
    service = ContractService(db)
    contract = await service.get_contract_by_id(contract_id)

    if not contract:
        raise HTTPException(status_code=404, detail="Contract not found")

    return contract


@router.put("/{contract_id}", response_model=ContractResponse)
async def update_contract(
    contract_id: int,
    contract_data: ContractUpdate,
    db: AsyncSession = Depends(get_db),
):
    """Update a contract."""
    service = ContractService(db)
    contract = await service.update_contract(
        contract_id,
        **contract_data.model_dump(exclude_unset=True)
    )

    if not contract:
        raise HTTPException(status_code=404, detail="Contract not found")

    return contract


@router.post("/{contract_id}/submit", response_model=ContractResponse)
async def submit_contract(
    contract_id: int,
    db: AsyncSession = Depends(get_db),
):
    """Submit a contract for approval."""
    service = ContractService(db)
    contract = await service.submit_for_approval(contract_id)

    if not contract:
        raise HTTPException(status_code=404, detail="Contract not found")

    return contract


@router.post("/{contract_id}/approve", response_model=ApprovalResponse)
async def approve_contract(
    contract_id: int,
    approval_data: ApprovalRequest,
    user_id: int = 1,  # TODO: Get from auth
    db: AsyncSession = Depends(get_db),
):
    """Approve a contract."""
    service = ContractService(db)
    approval = await service.approve_contract(
        contract_id,
        user_id,
        approval_data.comment,
    )
    return approval


@router.post("/{contract_id}/reject", response_model=ApprovalResponse)
async def reject_contract(
    contract_id: int,
    approval_data: ApprovalRequest,
    user_id: int = 1,  # TODO: Get from auth
    db: AsyncSession = Depends(get_db),
):
    """Reject a contract."""
    service = ContractService(db)
    approval = await service.reject_contract(
        contract_id,
        user_id,
        approval_data.comment,
    )
    return approval


@router.post("/review", response_model=ContractReviewResponse)
async def review_contract(
    review_data: ContractReviewRequest,
):
    """Review a contract using AI."""
    result = await llm_service.review_contract(
        contract_content=review_data.contract_content,
        contract_type=review_data.contract_type,
    )
    return ContractReviewResponse(
        review_result=result,
        risks=[],
        suggestions=[],
    )


# Template endpoints
@router.post("/templates", response_model=ContractTemplateResponse)
async def create_template(
    template_data: ContractTemplateCreate,
    user_id: int = 1,  # TODO: Get from auth
    db: AsyncSession = Depends(get_db),
):
    """Create a contract template."""
    service = ContractTemplateService(db)
    template = await service.create_template(
        created_by=user_id,
        **template_data.model_dump(),
    )
    return template


@router.get("/templates", response_model=list[ContractTemplateResponse])
async def list_templates(
    skip: int = Query(0, ge=0),
    limit: int = Query(20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
):
    """List contract templates."""
    service = ContractTemplateService(db)
    templates = await service.get_templates_list(skip, limit)
    return templates