"""
IPFS-primary orchestration.

Everything on IPFS:
- Inputs (media files)
- Analysis results (JSON)
- Execution plans (JSON)
- Step outputs (media files)

The entire pipeline just passes CIDs around.

Uses HybridStateManager for:
- Fast local Redis operations
- Background IPNS sync with other L1 nodes
"""

import json
import logging
import os
from pathlib import Path
from typing import Dict, List, Optional

from celery import group

import sys
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from celery_app import app
import ipfs_client
from hybrid_state import get_state_manager

# Import artdag modules
try:
    from artdag.analysis import Analyzer, AnalysisResult
    from artdag.planning import RecipePlanner, ExecutionPlan, Recipe
    from artdag import nodes  # Register executors
except ImportError:
    Analyzer = None
    AnalysisResult = None
    RecipePlanner = None
    ExecutionPlan = None
    Recipe = None

from .analyze_cid import analyze_input_cid
from .execute_cid import execute_step_cid

logger = logging.getLogger(__name__)


def compute_run_id(recipe_cid: str, input_cids: Dict[str, str]) -> str:
    """Compute deterministic run ID from recipe and inputs."""
    import hashlib
    # Sort inputs for determinism
    sorted_inputs = sorted(input_cids.items())
    data = f"{recipe_cid}:{sorted_inputs}"
    return hashlib.sha3_256(data.encode()).hexdigest()


@app.task(bind=True, name='tasks.register_input_cid')
def register_input_cid(
    self,
    input_path: str,
) -> dict:
    """
    Register an input file on IPFS.

    Args:
        input_path: Local path to the input file

    Returns:
        Dict with 'cid' and 'content_hash'
    """
    import hashlib

    path = Path(input_path)
    if not path.exists():
        return {"status": "failed", "error": f"File not found: {input_path}"}

    # Compute content hash
    with open(path, "rb") as f:
        content_hash = hashlib.sha3_256(f.read()).hexdigest()

    # Add to IPFS
    cid = ipfs_client.add_file(path)
    if not cid:
        return {"status": "failed", "error": "Failed to add to IPFS"}

    logger.info(f"[CID] Registered input: {path.name} → {cid}")

    return {
        "status": "completed",
        "cid": cid,
        "content_hash": content_hash,
        "path": str(path),
    }


@app.task(bind=True, name='tasks.register_recipe_cid')
def register_recipe_cid(
    self,
    recipe_path: str,
) -> dict:
    """
    Register a recipe on IPFS.

    Args:
        recipe_path: Local path to the recipe YAML file

    Returns:
        Dict with 'cid' and 'recipe' (parsed)
    """
    if Recipe is None:
        raise ImportError("artdag.planning not available")

    path = Path(recipe_path)
    if not path.exists():
        return {"status": "failed", "error": f"Recipe not found: {recipe_path}"}

    # Parse recipe
    recipe = Recipe.from_file(path)

    # Store recipe YAML on IPFS
    recipe_bytes = path.read_bytes()
    cid = ipfs_client.add_bytes(recipe_bytes)
    if not cid:
        return {"status": "failed", "error": "Failed to add recipe to IPFS"}

    logger.info(f"[CID] Registered recipe: {recipe.name} → {cid}")

    return {
        "status": "completed",
        "cid": cid,
        "name": recipe.name,
        "version": recipe.version,
    }


@app.task(bind=True, name='tasks.generate_plan_cid')
def generate_plan_cid(
    self,
    recipe_cid: str,
    input_cids: Dict[str, str],
    input_hashes: Dict[str, str],
    analysis_cids: Optional[Dict[str, str]] = None,
) -> dict:
    """
    Generate execution plan and store on IPFS.

    Args:
        recipe_cid: IPFS CID of the recipe
        input_cids: Mapping from input name to IPFS CID
        input_hashes: Mapping from input name to content hash
        analysis_cids: Optional mapping from input_hash to analysis CID

    Returns:
        Dict with 'plan_cid' and 'plan_id'
    """
    if RecipePlanner is None:
        raise ImportError("artdag.planning not available")

    # Fetch recipe from IPFS
    recipe_bytes = ipfs_client.get_bytes(recipe_cid)
    if not recipe_bytes:
        return {"status": "failed", "error": f"Failed to fetch recipe: {recipe_cid}"}

    # Parse recipe from YAML
    import yaml
    recipe_dict = yaml.safe_load(recipe_bytes.decode('utf-8'))
    recipe = Recipe.from_dict(recipe_dict)

    # Fetch analysis results if provided
    analysis = {}
    if analysis_cids:
        for input_hash, analysis_cid in analysis_cids.items():
            analysis_bytes = ipfs_client.get_bytes(analysis_cid)
            if analysis_bytes:
                analysis_dict = json.loads(analysis_bytes.decode('utf-8'))
                analysis[input_hash] = AnalysisResult.from_dict(analysis_dict)

    # Generate plan
    planner = RecipePlanner(use_tree_reduction=True)
    plan = planner.plan(
        recipe=recipe,
        input_hashes=input_hashes,
        analysis=analysis if analysis else None,
    )

    # Store plan on IPFS
    plan_cid = ipfs_client.add_json(json.loads(plan.to_json()))
    if not plan_cid:
        return {"status": "failed", "error": "Failed to store plan on IPFS"}

    # Cache plan_id → plan_cid mapping
    get_state_manager().set_plan_cid(plan.plan_id, plan_cid)

    logger.info(f"[CID] Generated plan: {plan.plan_id[:16]}... → {plan_cid}")

    return {
        "status": "completed",
        "plan_cid": plan_cid,
        "plan_id": plan.plan_id,
        "steps": len(plan.steps),
    }


@app.task(bind=True, name='tasks.execute_plan_from_cid')
def execute_plan_from_cid(
    self,
    plan_cid: str,
    input_cids: Dict[str, str],
) -> dict:
    """
    Execute a plan fetched from IPFS.

    Args:
        plan_cid: IPFS CID of the execution plan
        input_cids: Mapping from input name/step_id to IPFS CID

    Returns:
        Dict with 'output_cid' and step results
    """
    if ExecutionPlan is None:
        raise ImportError("artdag.planning not available")

    # Fetch plan from IPFS
    plan_bytes = ipfs_client.get_bytes(plan_cid)
    if not plan_bytes:
        return {"status": "failed", "error": f"Failed to fetch plan: {plan_cid}"}

    plan_json = plan_bytes.decode('utf-8')
    plan = ExecutionPlan.from_json(plan_json)

    logger.info(f"[CID] Executing plan: {plan.plan_id[:16]}... ({len(plan.steps)} steps)")

    # CID results accumulate as steps complete
    cid_results = dict(input_cids)
    step_cids = {}

    steps_by_level = plan.get_steps_by_level()

    for level in sorted(steps_by_level.keys()):
        steps = steps_by_level[level]
        logger.info(f"[CID] Level {level}: {len(steps)} steps")

        # Build input CIDs for this level
        level_input_cids = dict(cid_results)
        level_input_cids.update(step_cids)

        # Dispatch steps in parallel
        tasks = [
            execute_step_cid.s(step.to_json(), level_input_cids)
            for step in steps
        ]

        if len(tasks) == 1:
            results = [tasks[0].apply_async().get(timeout=3600)]
        else:
            job = group(tasks)
            results = job.apply_async().get(timeout=3600)

        # Collect output CIDs
        for step, result in zip(steps, results):
            if result.get("status") in ("completed", "cached", "completed_by_other"):
                step_cids[step.step_id] = result["cid"]
            else:
                return {
                    "status": "failed",
                    "failed_step": step.step_id,
                    "error": result.get("error", "Unknown error"),
                }

    # Get final output CID
    output_step_id = plan.output_step or plan.steps[-1].step_id
    output_cid = step_cids.get(output_step_id)

    logger.info(f"[CID] Plan complete: {output_cid}")

    return {
        "status": "completed",
        "plan_id": plan.plan_id,
        "plan_cid": plan_cid,
        "output_cid": output_cid,
        "step_cids": step_cids,
    }


@app.task(bind=True, name='tasks.run_recipe_cid')
def run_recipe_cid(
    self,
    recipe_cid: str,
    input_cids: Dict[str, str],
    input_hashes: Dict[str, str],
    features: Optional[List[str]] = None,
) -> dict:
    """
    Run complete pipeline: analyze → plan → execute.

    Everything on IPFS. Returns output CID.

    Args:
        recipe_cid: IPFS CID of the recipe
        input_cids: Mapping from input name to IPFS CID
        input_hashes: Mapping from input name to content hash
        features: Optional list of features to analyze

    Returns:
        Dict with output_cid and all intermediate CIDs
    """
    if features is None:
        features = ["beats", "energy"]

    logger.info(f"[CID] Running recipe {recipe_cid} with {len(input_cids)} inputs")

    # Compute run ID for caching
    run_id = compute_run_id(recipe_cid, input_cids)

    # Check if run is already cached
    cached_output = get_state_manager().get_run_cid(run_id)
    if cached_output:
        logger.info(f"[CID] Run cache hit: {run_id[:16]}... → {cached_output}")
        return {
            "status": "cached",
            "run_id": run_id,
            "output_cid": cached_output,
        }

    # Phase 1: Analyze inputs
    logger.info("[CID] Phase 1: Analysis")
    analysis_cids = {}

    for input_name, input_cid in input_cids.items():
        input_hash = input_hashes.get(input_name)
        if not input_hash:
            continue

        result = analyze_input_cid.apply_async(
            args=[input_cid, input_hash, features]
        ).get(timeout=600)

        if result.get("status") in ("completed", "cached"):
            analysis_cids[input_hash] = result["analysis_cid"]
        else:
            logger.warning(f"[CID] Analysis failed for {input_name}: {result.get('error')}")

    # Phase 2: Generate plan
    logger.info("[CID] Phase 2: Planning")
    plan_result = generate_plan_cid.apply_async(
        args=[recipe_cid, input_cids, input_hashes, analysis_cids]
    ).get(timeout=120)

    if plan_result.get("status") != "completed":
        return {
            "status": "failed",
            "phase": "planning",
            "error": plan_result.get("error", "Unknown error"),
        }

    plan_cid = plan_result["plan_cid"]

    # Phase 3: Execute
    logger.info("[CID] Phase 3: Execution")
    exec_result = execute_plan_from_cid.apply_async(
        args=[plan_cid, input_cids]
    ).get(timeout=7200)  # 2 hour timeout for execution

    if exec_result.get("status") != "completed":
        return {
            "status": "failed",
            "phase": "execution",
            "error": exec_result.get("error", "Unknown error"),
        }

    output_cid = exec_result["output_cid"]

    # Cache the run
    get_state_manager().set_run_cid(run_id, output_cid)

    logger.info(f"[CID] Run complete: {run_id[:16]}... → {output_cid}")

    return {
        "status": "completed",
        "run_id": run_id,
        "recipe_cid": recipe_cid,
        "analysis_cids": analysis_cids,
        "plan_cid": plan_cid,
        "output_cid": output_cid,
        "step_cids": exec_result.get("step_cids", {}),
    }


@app.task(bind=True, name='tasks.run_from_local')
def run_from_local(
    self,
    recipe_path: str,
    input_paths: Dict[str, str],
    features: Optional[List[str]] = None,
) -> dict:
    """
    Convenience task: register local files and run.

    For bootstrapping - registers recipe and inputs on IPFS, then runs.

    Args:
        recipe_path: Local path to recipe YAML
        input_paths: Mapping from input name to local file path
        features: Optional list of features to analyze

    Returns:
        Dict with all CIDs including output
    """
    import hashlib

    # Register recipe
    recipe_result = register_recipe_cid.apply_async(args=[recipe_path]).get(timeout=60)
    if recipe_result.get("status") != "completed":
        return {"status": "failed", "phase": "register_recipe", "error": recipe_result.get("error")}

    recipe_cid = recipe_result["cid"]

    # Register inputs
    input_cids = {}
    input_hashes = {}

    for name, path in input_paths.items():
        result = register_input_cid.apply_async(args=[path]).get(timeout=300)
        if result.get("status") != "completed":
            return {"status": "failed", "phase": "register_input", "input": name, "error": result.get("error")}

        input_cids[name] = result["cid"]
        input_hashes[name] = result["content_hash"]

    # Run the pipeline
    return run_recipe_cid.apply_async(
        args=[recipe_cid, input_cids, input_hashes, features]
    ).get(timeout=7200)