from pathlib import Path
from datetime import datetime, timezone
import json
import os
from uuid import uuid4

import psycopg

from fastapi import FastAPI, Request
from pydantic import BaseModel
from fastapi.responses import FileResponse


LOG_PATH = Path("activation.log")
DATABASE_URL = os.environ.get("TUXFLOTTE_DATABASE_URL")
app = FastAPI(title="Provisioning Activation Server", version="0.1.0")


class ActivationRequest(BaseModel):
    activation_code: str
    device_fingerprint: str
    hostname: str | None = None
    machine_id: str | None = None
    client_version: str | None = None
    hardware: dict


class ResolveRequest(BaseModel):
    device_id: str


def write_log(entry: dict) -> None:
    with LOG_PATH.open("a", encoding="utf-8") as f:
        f.write(json.dumps(entry, ensure_ascii=False) + "\n")

def get_database_connection():
    if not DATABASE_URL:
        raise RuntimeError("TUXFLOTTE_DATABASE_URL ist nicht gesetzt.")

    return psycopg.connect(DATABASE_URL)

def load_or_create_device(
    organization_id,
    device_fingerprint: str,
    hostname: str | None,
) -> tuple[dict, bool]:
    """
    Lädt ein bekanntes Gerät oder legt es neu an.

    Rückgabe:
        (device, created)
    """

    with get_database_connection() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                SELECT
                    id,
                    organization_id,
                    device_fingerprint,
                    hostname,
                    created_at,
                    last_seen
                FROM devices
                WHERE device_fingerprint = %s
                """,
                (device_fingerprint,),
            )

            row = cur.fetchone()

            if row is not None:
                if str(row[1]) != str(organization_id):
                    raise RuntimeError(
                    "Das Gerät ist bereits einer anderen Organization zugeordnet."
                    )
                cur.execute(
                    """
                    UPDATE devices
                    SET
                        hostname = %s,
                        last_seen = CURRENT_TIMESTAMP
                    WHERE id = %s
                    RETURNING
                        id,
                        organization_id,
                        device_fingerprint,
                        hostname,
                        created_at,
                        last_seen
                    """,
                    (hostname, row[0]),
                )

                row = cur.fetchone()
                created = False
            else:
                device_id = uuid4()

                cur.execute(
                    """
                    INSERT INTO devices (
                        id,
                        organization_id,
                        device_fingerprint,
                        hostname
                    )
                    VALUES (%s, %s, %s, %s)
                    RETURNING
                        id,
                        organization_id,
                        device_fingerprint,
                        hostname,
                        created_at,
                        last_seen
                    """,
                    (
                        device_id,
                        organization_id,
                        device_fingerprint,
                        hostname,
                    ),
                )

                row = cur.fetchone()
                created = True

    device = {
        "id": str(row[0]),
        "organization_id": str(row[1]),
        "device_fingerprint": row[2],
        "hostname": row[3],
        "created_at": row[4].isoformat(),
        "last_seen": row[5].isoformat(),
    }

    return device, created

def store_hardware_snapshot(
    device_id: str,
    hardware: dict,
) -> str:
    snapshot_id = uuid4()

    identity = hardware.get("identity", {})
    system = hardware.get("system", {})
    mainboard = hardware.get("mainboard", {})
    firmware = hardware.get("firmware", {})
    security = hardware.get("security", {})
    cpu = system.get("cpu", {})

    with get_database_connection() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                INSERT INTO hardware_snapshots (
                    id,
                    device_id,
                    architecture,
                    manufacturer,
                    product_name,
                    product_version,
                    system_uuid,
                    system_serial,
                    board_vendor,
                    board_name,
                    board_serial,
                    bios_vendor,
                    bios_version,
                    boot_mode,
                    secure_boot,
                    tpm_version,
                    cpu_model,
                    cpu_logical_count,
                    memory_bytes
                )
                VALUES (
                    %s, %s, %s, %s, %s,
                    %s, %s, %s, %s, %s,
                    %s, %s, %s, %s, %s,
                    %s, %s, %s, %s
                )
                """,
                (
                    snapshot_id,
                    device_id,
                    system["architecture"],
                    system.get("manufacturer"),
                    system.get("product_name"),
                    system.get("product_version"),
                    identity.get("system_uuid"),
                    identity.get("system_serial"),
                    mainboard.get("vendor"),
                    mainboard.get("name"),
                    identity.get("board_serial"),
                    firmware.get("bios_vendor"),
                    firmware.get("bios_version"),
                    firmware.get("boot_mode"),
                    firmware.get("secure_boot"),
                    security.get("tpm_version"),
                    cpu.get("model"),
                    cpu.get("logical_count"),
                    system.get("memory_bytes"),
                ),
            )

            for interface in hardware.get("network_interfaces", []):
                cur.execute(
                    """
                    INSERT INTO network_interfaces (
                        id,
                        hardware_snapshot_id,
                        name,
                        type,
                        mac_address
                    )
                    VALUES (%s, %s, %s, %s, %s)
                    """,
                    (
                        uuid4(),
                        snapshot_id,
                        interface["name"],
                        interface["type"],
                        interface["mac"],
                    ),
                )

            for storage_device in hardware.get("storage_devices", []):
                cur.execute(
                    """
                    INSERT INTO storage_devices (
                        id,
                        hardware_snapshot_id,
                        name,
                        model,
                        serial,
                        size_bytes,
                        transport
                    )
                    VALUES (%s, %s, %s, %s, %s, %s, %s)
                    """,
                    (
                        uuid4(),
                        snapshot_id,
                        storage_device["name"],
                        storage_device.get("model"),
                        storage_device.get("serial"),
                        storage_device["size_bytes"],
                        storage_device.get("transport"),
                    ),
                )

    return str(snapshot_id)

def find_activation_code(code: str):
    with get_database_connection() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                SELECT ac.organization_id, o.name
                FROM activation_codes ac
                JOIN organizations o ON o.id = ac.organization_id
                WHERE ac.code = %s AND ac.active
                """,
                (code,),
            )
            row = cur.fetchone()

    if row is None:
        return None

    return {"organization_id": str(row[0]), "organization_name": row[1]}

def fetch_templates(organization_id: str) -> list[dict]:
    with get_database_connection() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                SELECT
                    bv.id, bv.label, bv.is_default,
                    w.id, w.name,
                    b.id, b.name, b.version
                FROM bereitstellungsvorlagen bv
                JOIN workspaces w ON w.id = bv.workspace_id
                JOIN backends b ON b.id = bv.backend_id
                WHERE bv.organization_id = %s
                ORDER BY bv.is_default DESC, bv.label
                """,
                (organization_id,),
            )
            rows = cur.fetchall()

    return [
        {
            "id": str(row[0]),
            "label": row[1],
            "workspace": {"id": str(row[3]), "name": row[4]},
            "backend": {"id": str(row[5]), "name": row[6], "version": row[7]},
            "is_default": row[2],
        }
        for row in rows
    ]

@app.get("/health")
def health():
    return {
        "status": "ok",
        "service": "provisioning-server",
        "version": "0.1.0"
    }


@app.post("/api/v1/activate")
def activate(payload: ActivationRequest, request: Request):
    activation = find_activation_code(payload.activation_code)

    success = activation is not None
    device = None
    device_created = False

    hardware_snapshot_id = None

    if success:
        organization_id = activation["organization_id"]

        device, device_created = load_or_create_device(
            organization_id,
            payload.device_fingerprint,
            payload.hostname,
        )
        hardware_snapshot_id = store_hardware_snapshot(
            device["id"],
            payload.hardware,
        )

    write_log({
        "timestamp": datetime.now(timezone.utc).isoformat(),
        "event": "activate",
        "success": success,
        "remote_ip": request.client.host if request.client else None,
        "activation_code": payload.activation_code,
        "hostname": payload.hostname,
        "machine_id": payload.machine_id,
        "client_version": payload.client_version
    })

    if not success:
        return {
            "success": False,
            "error": "invalid_activation_code",
            "message": "Der Aktivierungscode ist ungültig."
        }

    return {
        "success": True,

        "device": {
            "id": device["id"],
            "fingerprint": device["device_fingerprint"],
            "hostname": device["hostname"],
            "registration_status": (
                "registered"
                if device_created
                else "existing"
            ),
            "hardware_snapshot_id": hardware_snapshot_id,
        },

        "customer": {
            "id": activation["organization_id"],
            "organization_id": activation["organization_id"],
            "name": activation["organization_name"],
        },
        "templates": fetch_templates(activation["organization_id"]),
    }


@app.post("/api/v1/templates/{template_id}/resolve")
def resolve_template(template_id: str, payload: ResolveRequest):
    with get_database_connection() as conn:
        with conn.cursor() as cur:
            cur.execute(
                """
                SELECT bv.workspace_id, bv.backend_id, w.key, b.key,
                       bv.disk_encryption, bv.partitioning, bv.secure_boot_required
                FROM bereitstellungsvorlagen bv
                JOIN workspaces w ON w.id = bv.workspace_id
                JOIN backends b ON b.id = bv.backend_id
                WHERE bv.id = %s
                """,
                (template_id,),
            )
            template_row = cur.fetchone()

            if template_row is None:
                return {
                    "success": False,
                    "error": "template_not_found",
                    "message": "Die angeforderte Bereitstellungsvorlage wurde nicht gefunden."
                }

            (
                workspace_id, backend_id, workspace_key, backend_key,
                disk_encryption, partitioning, secure_boot_required,
            ) = template_row

            cur.execute(
                """
                SELECT m.key, bp.ansible_role
                FROM workspace_merkmale wm
                JOIN merkmale m ON m.id = wm.merkmal_id
                JOIN blueprints bp ON bp.merkmal_id = m.id AND bp.backend_id = %s
                WHERE wm.workspace_id = %s
                """,
                (backend_id, workspace_id),
            )
            blueprints = [
                {"merkmal": key, "ansible_role": ansible_role}
                for key, ansible_role in cur.fetchall()
            ]

            cur.execute(
                """
                INSERT INTO assignments (id, device_id, bereitstellungsvorlage_id)
                VALUES (%s, %s, %s)
                ON CONFLICT (device_id) DO UPDATE
                    SET bereitstellungsvorlage_id = EXCLUDED.bereitstellungsvorlage_id
                """,
                (uuid4(), payload.device_id, template_id),
            )

    return {
        "success": True,
        "runtime_blueprint": {
            "workspace_id": workspace_key,
            "backend_id": backend_key,
            "blueprints": blueprints,
            "installation_directives": {
                "disk_encryption": disk_encryption,
                "partitioning": partitioning,
                "secure_boot_required": secure_boot_required,
            },
        },
    }

@app.get("/installers/fedora-workstation/ks.cfg")
def get_fedora_kickstart():
    return FileResponse(
        "installers/fedora-workstation/ks.cfg",
        media_type="text/plain"
    )