# app/api/v1/platform/signup.py
"""
Platform signup API endpoints.

Handles the multi-step signup flow:
1. Start signup (select tier)
2. Claim Letzshop vendor (optional)
3. Create account
4. Setup payment (collect card via SetupIntent)
5. Complete signup (create subscription with trial)

All endpoints are public (no authentication required).
"""

import logging

from fastapi import APIRouter, Depends
from pydantic import BaseModel, EmailStr
from sqlalchemy.orm import Session

from app.core.database import get_db
from app.services.platform_signup_service import platform_signup_service

router = APIRouter()
logger = logging.getLogger(__name__)


# =============================================================================
# Request/Response Schemas
# =============================================================================


class SignupStartRequest(BaseModel):
    """Start signup - select tier."""

    tier_code: str
    is_annual: bool = False


class SignupStartResponse(BaseModel):
    """Response from signup start."""

    session_id: str
    tier_code: str
    is_annual: bool


class ClaimVendorRequest(BaseModel):
    """Claim Letzshop vendor."""

    session_id: str
    letzshop_slug: str
    letzshop_vendor_id: str | None = None


class ClaimVendorResponse(BaseModel):
    """Response from vendor claim."""

    session_id: str
    letzshop_slug: str
    vendor_name: str | None


class CreateAccountRequest(BaseModel):
    """Create account."""

    session_id: str
    email: EmailStr
    password: str
    first_name: str
    last_name: str
    company_name: str
    phone: str | None = None


class CreateAccountResponse(BaseModel):
    """Response from account creation."""

    session_id: str
    user_id: int
    vendor_id: int
    stripe_customer_id: str


class SetupPaymentRequest(BaseModel):
    """Request payment setup."""

    session_id: str


class SetupPaymentResponse(BaseModel):
    """Response with Stripe SetupIntent client secret."""

    session_id: str
    client_secret: str
    stripe_customer_id: str


class CompleteSignupRequest(BaseModel):
    """Complete signup after card collection."""

    session_id: str
    setup_intent_id: str


class CompleteSignupResponse(BaseModel):
    """Response from signup completion."""

    success: bool
    vendor_code: str
    vendor_id: int
    redirect_url: str
    trial_ends_at: str


# =============================================================================
# Endpoints
# =============================================================================


@router.post("/signup/start", response_model=SignupStartResponse)  # public
async def start_signup(request: SignupStartRequest) -> SignupStartResponse:
    """
    Start the signup process.

    Step 1: User selects a tier and billing period.
    Creates a signup session to track the flow.
    """
    session_id = platform_signup_service.create_session(
        tier_code=request.tier_code,
        is_annual=request.is_annual,
    )

    return SignupStartResponse(
        session_id=session_id,
        tier_code=request.tier_code,
        is_annual=request.is_annual,
    )


@router.post("/signup/claim-vendor", response_model=ClaimVendorResponse)  # public
async def claim_letzshop_vendor(
    request: ClaimVendorRequest,
    db: Session = Depends(get_db),
) -> ClaimVendorResponse:
    """
    Claim a Letzshop vendor.

    Step 2 (optional): User claims their Letzshop shop.
    This pre-fills vendor info during account creation.
    """
    vendor_name = platform_signup_service.claim_vendor(
        db=db,
        session_id=request.session_id,
        letzshop_slug=request.letzshop_slug,
        letzshop_vendor_id=request.letzshop_vendor_id,
    )

    return ClaimVendorResponse(
        session_id=request.session_id,
        letzshop_slug=request.letzshop_slug,
        vendor_name=vendor_name,
    )


@router.post("/signup/create-account", response_model=CreateAccountResponse)  # public
async def create_account(
    request: CreateAccountRequest,
    db: Session = Depends(get_db),
) -> CreateAccountResponse:
    """
    Create user and vendor accounts.

    Step 3: User provides account details.
    Creates User, Company, Vendor, and Stripe Customer.
    """
    result = platform_signup_service.create_account(
        db=db,
        session_id=request.session_id,
        email=request.email,
        password=request.password,
        first_name=request.first_name,
        last_name=request.last_name,
        company_name=request.company_name,
        phone=request.phone,
    )

    return CreateAccountResponse(
        session_id=request.session_id,
        user_id=result.user_id,
        vendor_id=result.vendor_id,
        stripe_customer_id=result.stripe_customer_id,
    )


@router.post("/signup/setup-payment", response_model=SetupPaymentResponse)  # public
async def setup_payment(request: SetupPaymentRequest) -> SetupPaymentResponse:
    """
    Create Stripe SetupIntent for card collection.

    Step 4: Collect card details without charging.
    The card will be charged after the trial period ends.
    """
    client_secret, stripe_customer_id = platform_signup_service.setup_payment(
        session_id=request.session_id,
    )

    return SetupPaymentResponse(
        session_id=request.session_id,
        client_secret=client_secret,
        stripe_customer_id=stripe_customer_id,
    )


@router.post("/signup/complete", response_model=CompleteSignupResponse)  # public
async def complete_signup(
    request: CompleteSignupRequest,
    db: Session = Depends(get_db),
) -> CompleteSignupResponse:
    """
    Complete signup after card collection.

    Step 5: Verify SetupIntent, attach payment method, create subscription.
    """
    result = platform_signup_service.complete_signup(
        db=db,
        session_id=request.session_id,
        setup_intent_id=request.setup_intent_id,
    )

    return CompleteSignupResponse(
        success=result.success,
        vendor_code=result.vendor_code,
        vendor_id=result.vendor_id,
        redirect_url=result.redirect_url,
        trial_ends_at=result.trial_ends_at,
    )


@router.get("/signup/session/{session_id}")  # public
async def get_signup_session(session_id: str) -> dict:
    """
    Get signup session status.

    Useful for resuming an incomplete signup.
    """
    session = platform_signup_service.get_session_or_raise(session_id)

    # Return safe subset of session data
    return {
        "session_id": session_id,
        "step": session.get("step"),
        "tier_code": session.get("tier_code"),
        "is_annual": session.get("is_annual"),
        "letzshop_slug": session.get("letzshop_slug"),
        "vendor_name": session.get("vendor_name"),
        "created_at": session.get("created_at"),
    }