"""Playbook endpoints for triggering infrastructure automation."""

import re
import uuid

import httpx
from fastapi import APIRouter, HTTPException, status
from pydantic import BaseModel, Field, field_validator
from sqlalchemy import select

from app.db import AsyncSessionDep
from app.models.agent import Agent
from app.models.task import Task
from app.models.tenant import Tenant
from app.playbooks.chatwoot import create_chatwoot_setup_task
from app.playbooks.nextcloud import (
    create_nextcloud_initial_setup_task,
    create_nextcloud_set_domain_task,
)
from app.schemas.task import TaskResponse

router = APIRouter(prefix="/tenants/{tenant_id}", tags=["Playbooks"])

# Health check timeout for Nextcloud availability
NEXTCLOUD_HEALTH_CHECK_TIMEOUT = 10.0


class ChatwootSetupRequest(BaseModel):
    """Request body for Chatwoot setup playbook."""

    agent_id: uuid.UUID | None = Field(
        None, description="Optional agent UUID to assign the task to"
    )
    domain: str = Field(
        ..., min_length=1, description="Domain for Chatwoot (e.g., support.example.com)"
    )


class NextcloudSetDomainRequest(BaseModel):
    """Request body for Nextcloud set-domain playbook."""

    public_url: str = Field(
        ...,
        min_length=1,
        description="Public URL for Nextcloud (e.g., https://cloud.example.com)",
    )
    pull: bool = Field(
        False,
        description="Whether to pull images before reloading the stack",
    )


class NextcloudInitialSetupRequest(BaseModel):
    """Request body for Nextcloud initial setup via Playwright."""

    admin_username: str = Field(
        ...,
        min_length=3,
        max_length=64,
        description="Username for the Nextcloud admin account",
    )
    admin_password: str = Field(
        ...,
        min_length=8,
        description="Password for the Nextcloud admin account (minimum 8 characters)",
    )

    @field_validator("admin_username")
    @classmethod
    def validate_username(cls, v: str) -> str:
        """Validate that username is alphanumeric (with underscores allowed)."""
        if not re.match(r"^[a-zA-Z][a-zA-Z0-9_]*$", v):
            raise ValueError(
                "Username must start with a letter and contain only letters, numbers, and underscores"
            )
        return v


# --- Helper functions ---


async def get_tenant_by_id(db: AsyncSessionDep, tenant_id: uuid.UUID) -> Tenant | None:
    """Retrieve a tenant by ID."""
    result = await db.execute(select(Tenant).where(Tenant.id == tenant_id))
    return result.scalar_one_or_none()


async def get_agent_by_id(db: AsyncSessionDep, agent_id: uuid.UUID) -> Agent | None:
    """Retrieve an agent by ID."""
    result = await db.execute(select(Agent).where(Agent.id == agent_id))
    return result.scalar_one_or_none()


async def get_online_agent_for_tenant(
    db: AsyncSessionDep, tenant_id: uuid.UUID
) -> Agent | None:
    """Get the first online agent for a tenant."""
    result = await db.execute(
        select(Agent)
        .where(Agent.tenant_id == tenant_id)
        .where(Agent.status == "online")
        .limit(1)
    )
    return result.scalar_one_or_none()


async def check_nextcloud_availability(base_url: str) -> bool:
    """
    Check if Nextcloud is available at the given URL.

    Performs a health check against {base_url}/status.php which returns
    JSON with installation status on a healthy Nextcloud instance.

    Args:
        base_url: The base URL for Nextcloud (e.g., "https://cloud.example.com")

    Returns:
        True if Nextcloud responds with a valid status, False otherwise
    """
    status_url = f"{base_url.rstrip('/')}/status.php"

    try:
        async with httpx.AsyncClient(
            timeout=NEXTCLOUD_HEALTH_CHECK_TIMEOUT,
            follow_redirects=True,
        ) as client:
            response = await client.get(status_url)

            # Nextcloud status.php returns 200 with JSON when healthy
            if response.status_code == 200:
                # Try to parse as JSON - valid Nextcloud returns {"installed":true,...}
                try:
                    data = response.json()
                    # If we get valid JSON with "installed" key, Nextcloud is available
                    return "installed" in data
                except (ValueError, KeyError):
                    # Not valid JSON, but 200 OK might still indicate availability
                    return True

            return False

    except (httpx.RequestError, httpx.TimeoutException):
        # Connection failed, timeout, or other network error
        return False


# --- Route handlers ---


@router.post(
    "/chatwoot/setup",
    response_model=TaskResponse,
    status_code=status.HTTP_201_CREATED,
)
async def setup_chatwoot(
    tenant_id: uuid.UUID,
    request: ChatwootSetupRequest,
    db: AsyncSessionDep,
) -> Task:
    """
    Trigger Chatwoot setup playbook for a tenant.

    Creates a COMPOSITE task with the following steps:
    1. **ENV_UPDATE**: Set FRONTEND_URL and BACKEND_URL in chatwoot.env
    2. **DOCKER_RELOAD**: Restart the Chatwoot stack with pull=True

    ## Request Body
    - **agent_id**: Optional agent UUID to assign the task to immediately
    - **domain**: The domain for Chatwoot (e.g., "support.example.com")

    ## Response
    Returns the created Task with type="COMPOSITE" and status="pending".

    The SysAdmin Agent will pick up this task and execute the steps in sequence.
    """
    # Validate tenant exists
    tenant = await get_tenant_by_id(db, tenant_id)
    if tenant is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Tenant {tenant_id} not found",
        )

    # Validate agent exists if provided
    if request.agent_id is not None:
        agent = await get_agent_by_id(db, request.agent_id)
        if agent is None:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail=f"Agent {request.agent_id} not found",
            )

    # Create the COMPOSITE task
    task = await create_chatwoot_setup_task(
        db=db,
        tenant_id=tenant_id,
        agent_id=request.agent_id,
        domain=request.domain,
    )

    return task


@router.post(
    "/nextcloud/set-domain",
    response_model=TaskResponse,
    status_code=status.HTTP_201_CREATED,
)
async def nextcloud_set_domain(
    tenant_id: uuid.UUID,
    request: NextcloudSetDomainRequest,
    db: AsyncSessionDep,
) -> Task:
    """
    Set Nextcloud domain for a tenant (v1 - reload only).

    Creates a COMPOSITE task with a single DOCKER_RELOAD step.
    Auto-resolves the agent from the tenant (first online agent).

    **Note:** This is v1 of the playbook. It only reloads the Nextcloud stack.
    Future versions will add occ commands to configure config.php.

    ## Request Body
    - **public_url**: The public URL for Nextcloud (e.g., "https://cloud.example.com")
    - **pull**: Whether to pull images before reloading (default: false)

    ## Response
    Returns the created Task with type="COMPOSITE" and status="pending".

    The SysAdmin Agent will pick up this task and execute the steps in sequence.
    """
    # Validate tenant exists
    tenant = await get_tenant_by_id(db, tenant_id)
    if tenant is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Tenant {tenant_id} not found",
        )

    # Auto-resolve agent (first online agent for tenant)
    agent = await get_online_agent_for_tenant(db, tenant_id)
    if agent is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"No online agent found for tenant {tenant_id}",
        )

    # Create the COMPOSITE task
    task = await create_nextcloud_set_domain_task(
        db=db,
        tenant_id=tenant_id,
        agent_id=agent.id,
        public_url=request.public_url,
        pull=request.pull,
    )

    return task


@router.post(
    "/nextcloud/setup",
    response_model=TaskResponse,
    status_code=status.HTTP_201_CREATED,
)
async def nextcloud_initial_setup(
    tenant_id: uuid.UUID,
    request: NextcloudInitialSetupRequest,
    db: AsyncSessionDep,
) -> Task:
    """
    Perform initial Nextcloud setup via Playwright browser automation.

    Creates a PLAYWRIGHT task that navigates to the Nextcloud installation page
    and creates the admin account. This should only be called once on a fresh
    Nextcloud installation.

    **Prerequisites:**
    - Tenant must have a domain configured
    - Nextcloud must be deployed and accessible at `https://cloud.{domain}`
    - An online agent must be registered for the tenant

    **Health Check:**
    Before creating the task, the endpoint checks if Nextcloud is available
    at `https://cloud.{domain}/status.php`. If not reachable, returns 409.

    ## Request Body
    - **admin_username**: Username for the admin account (3-64 chars, alphanumeric)
    - **admin_password**: Password for the admin account (minimum 8 characters)

    ## Response
    Returns the created Task with type="PLAYWRIGHT" and status="pending".

    ## Errors
    - **404**: Tenant not found
    - **400**: Tenant has no domain configured
    - **404**: No online agent found for tenant
    - **409**: Nextcloud not available (health check failed)
    - **422**: Invalid username or password format
    """
    # Validate tenant exists
    tenant = await get_tenant_by_id(db, tenant_id)
    if tenant is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Tenant {tenant_id} not found",
        )

    # Validate tenant has domain configured
    if not tenant.domain:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Tenant {tenant_id} has no domain configured",
        )

    # Auto-resolve agent (first online agent for tenant)
    agent = await get_online_agent_for_tenant(db, tenant_id)
    if agent is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"No online agent found for tenant {tenant_id}",
        )

    # Construct Nextcloud base URL from tenant domain
    base_url = f"https://cloud.{tenant.domain}"

    # Health check: verify Nextcloud is accessible
    is_available = await check_nextcloud_availability(base_url)
    if not is_available:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Nextcloud not available at {base_url}. "
            "Ensure Nextcloud is deployed and accessible before running setup.",
        )

    # Create the PLAYWRIGHT task
    task = await create_nextcloud_initial_setup_task(
        db=db,
        tenant_id=tenant_id,
        agent_id=agent.id,
        base_url=base_url,
        admin_username=request.admin_username,
        admin_password=request.admin_password,
    )

    return task