# main.py
"""
Wizamart FastAPI Application

Multi-tenant e-commerce marketplace platform with:
- Three deployment modes (subdomain, custom domain, path-based)
- Three interfaces (platform administration (admin), vendor dashboard (vendor), customer shop (shop))
- Comprehensive exception handling
- Middleware stack for context injection
"""

import io
import sys

# Fix Windows console encoding issues (must be at the very top)
if sys.platform == "win32":
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8")
    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding="utf-8")

import logging
from datetime import UTC, datetime
from pathlib import Path

import sentry_sdk
from fastapi import Depends, FastAPI, HTTPException, Request, Response
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, HTMLResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from sentry_sdk.integrations.fastapi import FastApiIntegration
from sentry_sdk.integrations.sqlalchemy import SqlalchemyIntegration
from sqlalchemy import text
from sqlalchemy.orm import Session

from app.api.main import api_router
from app.core.config import settings

# =============================================================================
# SENTRY INITIALIZATION
# =============================================================================
# Initialize Sentry for error tracking (only if DSN is configured)
if settings.sentry_dsn:
    sentry_sdk.init(
        dsn=settings.sentry_dsn,
        environment=settings.sentry_environment,
        traces_sample_rate=settings.sentry_traces_sample_rate,
        integrations=[
            FastApiIntegration(transaction_style="endpoint"),
            SqlalchemyIntegration(),
        ],
        # Send PII data (emails, usernames) - set to False if privacy is critical
        send_default_pii=True,
        # Release version for tracking deployments
        release=f"wizamart@{settings.version}",
    )
    logging.getLogger(__name__).info(
        f"Sentry initialized for environment: {settings.sentry_environment}"
    )
from app.core.database import get_db
from app.core.lifespan import lifespan
from app.exceptions import ServiceUnavailableException
from app.exceptions.handler import setup_exception_handlers

# Import page routers
from app.routes import admin_pages, platform_pages, shop_pages, vendor_pages
from app.utils.i18n import get_jinja2_globals
from middleware.context import ContextMiddleware
from middleware.language import LanguageMiddleware
from middleware.logging import LoggingMiddleware
from middleware.theme_context import ThemeContextMiddleware

# Import REFACTORED class-based middleware
from middleware.vendor_context import VendorContextMiddleware

logger = logging.getLogger(__name__)

# Get the project root directory (where main.py is located)
BASE_DIR = Path(__file__).resolve().parent
STATIC_DIR = BASE_DIR / "static"
TEMPLATES_DIR = BASE_DIR / "app" / "templates"

# FastAPI app with lifespan
app = FastAPI(
    title=settings.project_name,
    description=settings.description,
    version=settings.version,
    lifespan=lifespan,
)

# Configure Jinja2 Templates
templates = Jinja2Templates(directory=str(TEMPLATES_DIR))

# Setup custom exception handlers (unified approach)
setup_exception_handlers(app)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.allowed_hosts,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# ============================================================================
# MIDDLEWARE REGISTRATION (CORRECTED ORDER!)
# ============================================================================
#
# IMPORTANT: Middleware execution order with BaseHTTPMiddleware:
#
# When using app.add_middleware or wrapping with BaseHTTPMiddleware,
# the LAST added middleware runs FIRST (LIFO - Last In, First Out).
#
# So we add them in REVERSE order of desired execution:
#
# Desired execution order:
#   1. VendorContextMiddleware    (detect vendor, extract clean_path)
#   2. ContextMiddleware          (detect context using clean_path)
#   3. LanguageMiddleware         (detect language based on context)
#   4. ThemeContextMiddleware     (load theme)
#   5. LoggingMiddleware          (log all requests)
#
# Therefore we add them in REVERSE:
#   - Add ThemeContextMiddleware FIRST (runs LAST in request)
#   - Add LanguageMiddleware SECOND (runs after context)
#   - Add ContextMiddleware THIRD
#   - Add VendorContextMiddleware FOURTH
#   - Add LoggingMiddleware LAST (runs FIRST for timing)
# ============================================================================

logger.info("=" * 80)
logger.info("MIDDLEWARE REGISTRATION")
logger.info("=" * 80)

# Add logging middleware (runs first for timing, logs all requests/responses)
logger.info("Adding LoggingMiddleware (runs first for request timing)")
app.add_middleware(LoggingMiddleware)

# Add theme context middleware (runs last in request chain)
logger.info("Adding ThemeContextMiddleware (detects and loads theme)")
app.add_middleware(ThemeContextMiddleware)

# Add language middleware (detects language after context is determined)
logger.info("Adding LanguageMiddleware (detects language based on context)")
app.add_middleware(LanguageMiddleware)

# Add context detection middleware (runs after vendor context extraction)
logger.info("Adding ContextMiddleware (detects context type using clean_path)")
app.add_middleware(ContextMiddleware)

# Add vendor context middleware (runs first in request chain)
logger.info("Adding VendorContextMiddleware (detects vendor, extracts clean_path)")
app.add_middleware(VendorContextMiddleware)

logger.info("=" * 80)
logger.info("MIDDLEWARE ORDER SUMMARY:")
logger.info("  Execution order (request →):")
logger.info("    1. LoggingMiddleware (timing)")
logger.info("    2. VendorContextMiddleware (vendor detection)")
logger.info("    3. ContextMiddleware (context detection)")
logger.info("    4. LanguageMiddleware (language detection)")
logger.info("    5. ThemeContextMiddleware (theme loading)")
logger.info("    6. FastAPI Router")
logger.info("=" * 80)

# ========================================
# MOUNT STATIC FILES - Use absolute path
# ========================================
if STATIC_DIR.exists():
    app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")
    logger.info(f"Mounted static files from: {STATIC_DIR}")
else:
    logger.warning(f"Static directory not found at {STATIC_DIR}")

# Mount uploads directory for user-uploaded media files
UPLOADS_DIR = BASE_DIR / "uploads"
if UPLOADS_DIR.exists():
    app.mount("/uploads", StaticFiles(directory=str(UPLOADS_DIR)), name="uploads")
    logger.info(f"Mounted uploads from: {UPLOADS_DIR}")
else:
    # Create uploads directory if it doesn't exist
    UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
    app.mount("/uploads", StaticFiles(directory=str(UPLOADS_DIR)), name="uploads")
    logger.info(f"Created and mounted uploads directory: {UPLOADS_DIR}")
# ========================================

# Include API router (JSON endpoints at /api/*)
app.include_router(api_router, prefix="/api")

# ============================================================================
# FAVICON ROUTES (Must be registered BEFORE page routers)
# ============================================================================


def serve_favicon() -> Response:
    """
    Serve favicon with caching headers.
    Checks multiple possible locations for the favicon.
    """
    possible_paths = [
        STATIC_DIR / "favicon.ico",
        STATIC_DIR / "images" / "favicon.ico",
        STATIC_DIR / "assets" / "favicon.ico",
    ]

    for favicon_path in possible_paths:
        if favicon_path.exists():
            return FileResponse(
                favicon_path,
                media_type="image/x-icon",
                headers={
                    "Cache-Control": "public, max-age=86400",  # Cache for 1 day
                },
            )

    return Response(status_code=204)


@app.get("/favicon.ico", include_in_schema=False)
async def favicon():
    """Serve favicon from root path."""
    return serve_favicon()


@app.get("/vendor/favicon.ico", include_in_schema=False)
async def vendor_favicon():
    """Handle vendor-prefixed favicon requests."""
    return serve_favicon()


# ============================================================================
# HEALTH CHECK (Must be before catch-all routes)
# ============================================================================


@app.get("/health")
def health_check(db: Session = Depends(get_db)):
    """Health check endpoint"""
    try:
        # Test database connection
        db.execute(text("SELECT 1"))
        return {
            "status": "healthy",
            "timestamp": datetime.now(UTC),
            "message": f"{settings.project_name} v{settings.version}",
            "docs": {
                "swagger": "/docs",
                "redoc": "/redoc",
                "openapi": "/openapi.json",
                "complete": "/documentation",
            },
            "features": [
                "Multi-tenant architecture with vendor isolation",
                "JWT Authentication with role-based access control",
                "Marketplace product import and curation",
                "Vendor catalog management",
                "Product-based inventory tracking",
                "Stripe Connect payment processing",
            ],
            "supported_marketplaces": [
                "Letzshop",
            ],
            "deployment_modes": [
                "Subdomain-based (production): vendor.platform.com",
                "Custom domain (production): customvendordomain.com",
                "Path-based (development): /vendors/vendorname/ or /vendor/vendorname/",
            ],
            "auth_required": "Most endpoints require Bearer token authentication",
        }
    except Exception as e:
        logger.error(f"Health check failed: {e}")
        raise ServiceUnavailableException("Service unhealthy")


# ============================================================================
# HTML PAGE ROUTES (Jinja2 Templates)
# ============================================================================
# Include HTML page routes (these return rendered templates, not JSON)

logger.info("=" * 80)
logger.info("ROUTE REGISTRATION")
logger.info("=" * 80)

# Platform marketing pages (homepage, pricing, signup)
logger.info("Registering platform page routes: /*, /pricing, /find-shop, /signup")
app.include_router(
    platform_pages.router, prefix="", tags=["platform-pages"], include_in_schema=False
)

# Admin pages
logger.info("Registering admin page routes: /admin/*")
app.include_router(
    admin_pages.router, prefix="/admin", tags=["admin-pages"], include_in_schema=False
)

# Vendor management pages (dashboard, products, orders, etc.)
logger.info("Registering vendor page routes: /vendor/{code}/*")
app.include_router(
    vendor_pages.router,
    prefix="/vendor",
    tags=["vendor-pages"],
    include_in_schema=False,
)

# Customer shop pages - Register at TWO prefixes:
# 1. /shop/* (for subdomain/custom domain modes)
# 2. /vendors/{code}/shop/* (for path-based development mode)
logger.info("Registering shop page routes:")
logger.info("  - /shop/* (subdomain/custom domain mode)")
logger.info("  - /vendors/{code}/shop/* (path-based development mode)")

app.include_router(
    shop_pages.router, prefix="/shop", tags=["shop-pages"], include_in_schema=False
)

app.include_router(
    shop_pages.router,
    prefix="/vendors/{vendor_code}/shop",
    tags=["shop-pages"],
    include_in_schema=False,
)


# Add handler for /vendors/{vendor_code}/ root path
@app.get(
    "/vendors/{vendor_code}/", response_class=HTMLResponse, include_in_schema=False
)
async def vendor_root_path(
    vendor_code: str, request: Request, db: Session = Depends(get_db)
):
    """Handle vendor root path (e.g., /vendors/wizamart/)"""
    # Vendor should already be in request.state from middleware
    vendor = getattr(request.state, "vendor", None)

    if not vendor:
        raise HTTPException(status_code=404, detail=f"Vendor '{vendor_code}' not found")

    from app.routes.shop_pages import get_shop_context
    from app.services.content_page_service import content_page_service

    # Try to find landing page
    landing_page = content_page_service.get_page_for_vendor(
        db, slug="landing", vendor_id=vendor.id, include_unpublished=False
    )

    if not landing_page:
        landing_page = content_page_service.get_page_for_vendor(
            db, slug="home", vendor_id=vendor.id, include_unpublished=False
        )

    if landing_page:
        # Render landing page with selected template
        template_name = landing_page.template or "default"
        template_path = f"vendor/landing-{template_name}.html"

        return templates.TemplateResponse(
            template_path, get_shop_context(request, db=db, page=landing_page)
        )
    # No landing page - redirect to shop
    return RedirectResponse(url=f"/vendors/{vendor_code}/shop/", status_code=302)


# ============================================================================
# PLATFORM PUBLIC PAGES (Platform Homepage, About, FAQ, etc.)
# ============================================================================
logger.info("Registering platform public page routes:")
logger.info("  - / (platform homepage)")
logger.info("  - /{slug} (platform content pages: /about, /faq, /terms, /contact)")


@app.get("/", response_class=HTMLResponse, include_in_schema=False)
async def platform_homepage(request: Request, db: Session = Depends(get_db)):
    """
    Platform homepage at localhost:8000 or platform.com

    Looks for CMS page with slug='platform_homepage' (vendor_id=NULL)
    Falls back to default static template if not found.
    """
    from app.services.content_page_service import content_page_service

    logger.debug("[PLATFORM] Homepage requested")

    # Try to load platform homepage from CMS
    homepage = content_page_service.get_page_for_vendor(
        db,
        slug="platform_homepage",
        vendor_id=None,  # Platform-level page
        include_unpublished=False,
    )

    # Load header and footer navigation
    header_pages = content_page_service.list_pages_for_vendor(
        db, vendor_id=None, header_only=True, include_unpublished=False
    )

    footer_pages = content_page_service.list_pages_for_vendor(
        db, vendor_id=None, footer_only=True, include_unpublished=False
    )

    # Get language from request state and build i18n context
    language = getattr(request.state, "language", "fr")
    i18n_globals = get_jinja2_globals(language)

    if homepage:
        # Use template selection from CMS
        template_name = homepage.template or "default"
        template_path = f"platform/homepage-{template_name}.html"

        logger.info(f"[PLATFORM] Rendering CMS homepage with template: {template_path}")

        context = {
            "request": request,
            "page": homepage,
            "header_pages": header_pages,
            "footer_pages": footer_pages,
        }
        context.update(i18n_globals)

        return templates.TemplateResponse(template_path, context)

    # Fallback to default static template
    logger.info("[PLATFORM] No CMS homepage found, using default template")

    context = {
        "request": request,
        "header_pages": header_pages,
        "footer_pages": footer_pages,
    }
    context.update(i18n_globals)

    return templates.TemplateResponse("platform/homepage-default.html", context)


@app.get("/{slug}", response_class=HTMLResponse, include_in_schema=False)
async def platform_content_page(
    request: Request, slug: str, db: Session = Depends(get_db)
):
    """
    Platform content pages: /about, /faq, /terms, /contact, etc.

    Loads content from CMS with slug (vendor_id=NULL for platform pages).
    Returns 404 if page not found.

    This route MUST be defined LAST to avoid conflicts with other routes.
    """
    from app.services.content_page_service import content_page_service

    logger.debug(f"[PLATFORM] Content page requested: /{slug}")

    # Load page from CMS
    page = content_page_service.get_page_for_vendor(
        db,
        slug=slug,
        vendor_id=None,
        include_unpublished=False,  # Platform pages only
    )

    if not page:
        logger.warning(f"[PLATFORM] Content page not found: {slug}")
        raise HTTPException(status_code=404, detail=f"Page not found: {slug}")

    # Load header and footer navigation
    header_pages = content_page_service.list_pages_for_vendor(
        db, vendor_id=None, header_only=True, include_unpublished=False
    )

    footer_pages = content_page_service.list_pages_for_vendor(
        db, vendor_id=None, footer_only=True, include_unpublished=False
    )

    logger.info(f"[PLATFORM] Rendering content page: {page.title} (/{slug})")

    # Get language from request state and build i18n context
    language = getattr(request.state, "language", "fr")
    i18n_globals = get_jinja2_globals(language)

    context = {
        "request": request,
        "page": page,
        "header_pages": header_pages,
        "footer_pages": footer_pages,
    }
    context.update(i18n_globals)

    return templates.TemplateResponse("platform/content-page.html", context)


logger.info("=" * 80)

# Log all registered routes
logger.info("=" * 80)
logger.info("REGISTERED ROUTES SUMMARY")
logger.info("=" * 80)
for route in app.routes:
    if hasattr(route, "methods") and hasattr(route, "path"):
        methods = ", ".join(route.methods) if route.methods else "N/A"
        logger.info(f"  {methods:<10} {route.path:<60}")
logger.info("=" * 80)

# ============================================================================
# API ROUTES (JSON Responses)
# ============================================================================


# Public Routes (no authentication required)
@app.get("/", response_class=HTMLResponse, include_in_schema=False)
async def root(request: Request, db: Session = Depends(get_db)):
    """
    Smart root handler:
    - If vendor detected (domain/subdomain): Show vendor landing page or redirect to shop
    - If no vendor (platform root): Redirect to documentation
    """
    vendor = getattr(request.state, "vendor", None)

    if vendor:
        # Vendor context detected - serve landing page
        from app.services.content_page_service import content_page_service

        # Try to find landing page (slug='landing' or 'home')
        landing_page = content_page_service.get_page_for_vendor(
            db, slug="landing", vendor_id=vendor.id, include_unpublished=False
        )

        if not landing_page:
            # Try 'home' slug as fallback
            landing_page = content_page_service.get_page_for_vendor(
                db, slug="home", vendor_id=vendor.id, include_unpublished=False
            )

        if landing_page:
            # Render landing page with selected template
            from app.routes.shop_pages import get_shop_context

            template_name = landing_page.template or "default"
            template_path = f"vendor/landing-{template_name}.html"

            return templates.TemplateResponse(
                template_path, get_shop_context(request, db=db, page=landing_page)
            )
        # No landing page - redirect to shop
        vendor_context = getattr(request.state, "vendor_context", None)
        access_method = (
            vendor_context.get("detection_method", "unknown")
            if vendor_context
            else "unknown"
        )

        if access_method == "path":
            full_prefix = (
                vendor_context.get("full_prefix", "/vendor/")
                if vendor_context
                else "/vendor/"
            )
            return RedirectResponse(
                url=f"{full_prefix}{vendor.subdomain}/shop/", status_code=302
            )
        # Domain/subdomain
        return RedirectResponse(url="/shop/", status_code=302)
    # No vendor - platform root
    return RedirectResponse(url="/documentation")


@app.get("/documentation", response_class=HTMLResponse, include_in_schema=False)
async def documentation():
    """Redirect to documentation"""
    if settings.debug:
        return RedirectResponse(url="http://localhost:8001")
    return RedirectResponse(url=settings.documentation_url)


if __name__ == "__main__":
    import uvicorn

    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)