"""System API routes — health checks, status, and configuration."""

from __future__ import annotations

import os
from pathlib import Path

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

from content_engine.models.schemas import SystemStatus
from content_engine.config import IS_HF_SPACES

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

_comfyui_client = None
_catalog = None
_template_engine = None
_character_profiles = None


def init_routes(comfyui_client, catalog, template_engine, character_profiles=None):
    """Initialize route dependencies."""
    global _comfyui_client, _catalog, _template_engine, _character_profiles
    _comfyui_client = comfyui_client
    _catalog = catalog
    _template_engine = template_engine
    _character_profiles = character_profiles


@router.get("/health")
async def health_check():
    """Basic health check."""
    comfyui_ok = False
    if _comfyui_client:
        comfyui_ok = await _comfyui_client.is_available()
    return {"status": "ok", "comfyui": comfyui_ok}


@router.get("/status", response_model=SystemStatus)
async def system_status():
    """Get comprehensive system status."""
    comfyui_connected = False
    gpu_name = None
    vram_total_gb = None
    vram_free_gb = None
    queue_depth = 0

    if _comfyui_client:
        comfyui_connected = await _comfyui_client.is_available()
        if comfyui_connected:
            try:
                stats = await _comfyui_client.get_system_stats()
                devices = stats.get("devices", [])
                if devices:
                    gpu_name = devices[0].get("name")
                    vram_total_gb = devices[0].get("vram_total", 0) / (1024**3)
                    vram_free_gb = devices[0].get("vram_free", 0) / (1024**3)
                queue_depth = await _comfyui_client.get_queue_depth()
            except Exception:
                pass

    total_images = 0
    if _catalog:
        total_images = await _catalog.get_total_count()

    return SystemStatus(
        comfyui_connected=comfyui_connected,
        gpu_name=gpu_name,
        vram_total_gb=round(vram_total_gb, 2) if vram_total_gb else None,
        vram_free_gb=round(vram_free_gb, 2) if vram_free_gb else None,
        local_queue_depth=queue_depth,
        cloud_available=False,  # Phase 4
        total_images=total_images,
        pending_jobs=0,
    )


@router.get("/templates")
async def list_templates():
    """List all available prompt templates."""
    if _template_engine is None:
        return []
    templates = _template_engine.list_templates()
    return [
        {
            "id": t.id,
            "name": t.name,
            "category": t.category,
            "rating": t.rating,
            "variables": {
                name: {
                    "type": vdef.type,
                    "options": vdef.options,
                    "required": vdef.required,
                }
                for name, vdef in t.variables.items()
            },
        }
        for t in templates
    ]


@router.get("/characters")
async def list_characters():
    """List all configured character profiles."""
    if _character_profiles is None:
        return []
    return [
        {
            "id": c.id,
            "name": c.name,
            "trigger_word": c.trigger_word,
            "lora_filename": c.lora_filename,
            "lora_strength": c.lora_strength,
            "description": c.description,
        }
        for c in _character_profiles.values()
    ]


@router.get("/models/loras")
async def list_loras():
    """List available LoRA models from ComfyUI."""
    if _comfyui_client is None:
        return []
    try:
        return await _comfyui_client.get_models("loras")
    except Exception:
        return []


@router.get("/models/checkpoints")
async def list_checkpoints():
    """List available checkpoint models from ComfyUI."""
    if _comfyui_client is None:
        return []
    try:
        return await _comfyui_client.get_models("checkpoints")
    except Exception:
        return []


# --- API Settings ---

class APISettingsResponse(BaseModel):
    runpod_configured: bool
    runpod_key_preview: str | None = None
    wavespeed_configured: bool
    wavespeed_key_preview: str | None = None
    is_cloud: bool
    env_file_path: str | None = None


class UpdateAPIKeysRequest(BaseModel):
    runpod_api_key: str | None = None
    wavespeed_api_key: str | None = None


def _mask_key(key: str | None) -> str | None:
    """Mask API key showing only last 4 chars."""
    if not key:
        return None
    if len(key) <= 8:
        return "****"
    return f"****{key[-4:]}"


@router.get("/settings/api", response_model=APISettingsResponse)
async def get_api_settings():
    """Get current API settings status (keys are masked)."""
    runpod_key = os.environ.get("RUNPOD_API_KEY")
    wavespeed_key = os.environ.get("WAVESPEED_API_KEY")

    env_file = None
    if not IS_HF_SPACES:
        env_file = "D:/AI automation/content_engine/.env"

    return APISettingsResponse(
        runpod_configured=bool(runpod_key),
        runpod_key_preview=_mask_key(runpod_key),
        wavespeed_configured=bool(wavespeed_key),
        wavespeed_key_preview=_mask_key(wavespeed_key),
        is_cloud=IS_HF_SPACES,
        env_file_path=env_file,
    )


@router.post("/settings/api")
async def update_api_settings(request: UpdateAPIKeysRequest):
    """Update API keys. Only works in local mode (not HF Spaces).

    On HF Spaces, use the Settings > Secrets panel instead.
    """
    if IS_HF_SPACES:
        raise HTTPException(
            400,
            "Cannot update API keys on Hugging Face Spaces. "
            "Use Settings > Variables and secrets in your Space dashboard."
        )

    env_path = Path("D:/AI automation/content_engine/.env")

    # Read existing .env
    existing = {}
    if env_path.exists():
        with open(env_path) as f:
            for line in f:
                line = line.strip()
                if line and not line.startswith("#") and "=" in line:
                    key, val = line.split("=", 1)
                    existing[key.strip()] = val.strip()

    # Update keys
    updated = []
    if request.runpod_api_key is not None:
        existing["RUNPOD_API_KEY"] = request.runpod_api_key
        os.environ["RUNPOD_API_KEY"] = request.runpod_api_key
        updated.append("RUNPOD_API_KEY")

    if request.wavespeed_api_key is not None:
        existing["WAVESPEED_API_KEY"] = request.wavespeed_api_key
        os.environ["WAVESPEED_API_KEY"] = request.wavespeed_api_key
        updated.append("WAVESPEED_API_KEY")

    # Write back
    with open(env_path, "w") as f:
        for key, val in existing.items():
            f.write(f"{key}={val}\n")

    return {
        "status": "updated",
        "updated_keys": updated,
        "message": "API keys updated. Restart the server to fully apply changes."
    }