"""
Plan orchestration tasks.

Coordinates the full 3-phase execution:
1. Analyze inputs
2. Generate plan
3. Execute steps level by level

Uses IPFS-backed cache for durability.
"""

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

from celery import current_task, group, chain

# Import from the Celery app
import sys
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from celery_app import app
from claiming import get_claimer
from cache_manager import get_cache_manager

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

from .execute import execute_step

logger = logging.getLogger(__name__)

# Cache directories
CACHE_DIR = Path(os.environ.get('CACHE_DIR', str(Path.home() / ".artdag" / "cache")))
ANALYSIS_CACHE_DIR = CACHE_DIR / 'analysis'
PLAN_CACHE_DIR = CACHE_DIR / 'plans'


@app.task(bind=True, name='tasks.run_plan')
def run_plan(
    self,
    plan_json: str,
    run_id: Optional[str] = None,
) -> dict:
    """
    Execute a complete execution plan.

    Runs steps level by level, with parallel execution within each level.
    Results are stored in IPFS-backed cache.

    Args:
        plan_json: JSON-serialized ExecutionPlan
        run_id: Optional run ID for tracking

    Returns:
        Dict with execution results
    """
    if ExecutionPlan is None:
        raise ImportError("artdag.planning not available")

    plan = ExecutionPlan.from_json(plan_json)
    cache_mgr = get_cache_manager()

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

    # Build initial cache_ids mapping (step_id -> cache_id)
    cache_ids = {}
    for step in plan.steps:
        cache_ids[step.step_id] = step.cache_id

    # Also map input hashes
    for name, content_hash in plan.input_hashes.items():
        cache_ids[name] = content_hash

    # Group steps by level
    steps_by_level = plan.get_steps_by_level()
    max_level = max(steps_by_level.keys()) if steps_by_level else 0

    results_by_step = {}
    total_cached = 0
    total_executed = 0

    for level in range(max_level + 1):
        level_steps = steps_by_level.get(level, [])
        if not level_steps:
            continue

        logger.info(f"Executing level {level}: {len(level_steps)} steps")

        # Check which steps need execution
        steps_to_run = []

        for step in level_steps:
            # Check if cached
            cached_path = cache_mgr.get_by_content_hash(step.cache_id)
            if cached_path:
                results_by_step[step.step_id] = {
                    "status": "cached",
                    "cache_id": step.cache_id,
                    "output_path": str(cached_path),
                }
                total_cached += 1
            else:
                steps_to_run.append(step)

        if not steps_to_run:
            logger.info(f"Level {level}: all steps cached")
            continue

        # Build input cache_ids for this level
        level_cache_ids = dict(cache_ids)

        # Execute steps in parallel
        tasks = [
            execute_step.s(step.to_json(), plan.plan_id, level_cache_ids)
            for step in steps_to_run
        ]

        job = group(tasks)
        async_results = job.apply_async()

        # Wait for completion
        try:
            step_results = async_results.get(timeout=3600)
        except Exception as e:
            logger.error(f"Level {level} execution failed: {e}")
            return {
                "status": "failed",
                "error": str(e),
                "level": level,
                "results": results_by_step,
                "run_id": run_id,
            }

        # Process results
        for result in step_results:
            step_id = result.get("step_id")
            cache_id = result.get("cache_id")

            results_by_step[step_id] = result
            cache_ids[step_id] = cache_id

            if result.get("status") in ("completed", "cached", "completed_by_other"):
                total_executed += 1
            elif result.get("status") == "failed":
                logger.error(f"Step {step_id} failed: {result.get('error')}")
                return {
                    "status": "failed",
                    "error": f"Step {step_id} failed: {result.get('error')}",
                    "level": level,
                    "results": results_by_step,
                    "run_id": run_id,
                }

    # Get final output
    output_step = plan.get_step(plan.output_step)
    output_cache_id = output_step.cache_id if output_step else None
    output_path = None
    output_ipfs_cid = None
    output_name = plan.output_name

    if output_cache_id:
        output_path = cache_mgr.get_by_content_hash(output_cache_id)
        output_ipfs_cid = cache_mgr.get_ipfs_cid(output_cache_id)

    # Build list of all outputs with their names and artifacts
    all_outputs = []
    for step in plan.steps:
        step_result = results_by_step.get(step.step_id, {})
        step_outputs = step_result.get("outputs", [])

        # If no outputs in result, build from step definition
        if not step_outputs and step.outputs:
            for output_def in step.outputs:
                output_cache_path = cache_mgr.get_by_content_hash(output_def.cache_id)
                output_ipfs = cache_mgr.get_ipfs_cid(output_def.cache_id) if output_cache_path else None
                all_outputs.append({
                    "name": output_def.name,
                    "step_id": step.step_id,
                    "step_name": step.name,
                    "cache_id": output_def.cache_id,
                    "media_type": output_def.media_type,
                    "path": str(output_cache_path) if output_cache_path else None,
                    "ipfs_cid": output_ipfs,
                    "status": "cached" if output_cache_path else "missing",
                })
        else:
            for output in step_outputs:
                all_outputs.append({
                    **output,
                    "step_id": step.step_id,
                    "step_name": step.name,
                    "status": "completed",
                })

    return {
        "status": "completed",
        "run_id": run_id,
        "plan_id": plan.plan_id,
        "plan_name": plan.name,
        "recipe_name": plan.recipe_name,
        "output_name": output_name,
        "output_cache_id": output_cache_id,
        "output_path": str(output_path) if output_path else None,
        "output_ipfs_cid": output_ipfs_cid,
        "total_steps": len(plan.steps),
        "cached": total_cached,
        "executed": total_executed,
        "results": results_by_step,
        "outputs": all_outputs,
    }


@app.task(bind=True, name='tasks.run_recipe')
def run_recipe(
    self,
    recipe_yaml: str,
    input_hashes: Dict[str, str],
    features: List[str] = None,
    run_id: Optional[str] = None,
) -> dict:
    """
    Run a complete recipe through all 3 phases.

    1. Analyze: Extract features from inputs
    2. Plan: Generate execution plan
    3. Execute: Run the plan

    Args:
        recipe_yaml: Recipe YAML content
        input_hashes: Mapping from input name to content hash
        features: Features to extract (default: ["beats", "energy"])
        run_id: Optional run ID for tracking

    Returns:
        Dict with final results
    """
    if RecipePlanner is None or Analyzer is None:
        raise ImportError("artdag modules not available")

    if features is None:
        features = ["beats", "energy"]

    cache_mgr = get_cache_manager()

    logger.info(f"Running recipe with {len(input_hashes)} inputs")

    # Phase 1: Analyze
    logger.info("Phase 1: Analyzing inputs...")

    ANALYSIS_CACHE_DIR.mkdir(parents=True, exist_ok=True)
    analyzer = Analyzer(cache_dir=ANALYSIS_CACHE_DIR)

    analysis_results = {}
    for name, content_hash in input_hashes.items():
        # Get path from cache
        path = cache_mgr.get_by_content_hash(content_hash)
        if path:
            try:
                result = analyzer.analyze(
                    input_hash=content_hash,
                    features=features,
                    input_path=Path(path),
                )
                analysis_results[content_hash] = result
                logger.info(f"Analyzed {name}: tempo={result.tempo}, beats={len(result.beat_times or [])}")
            except Exception as e:
                logger.warning(f"Analysis failed for {name}: {e}")
        else:
            logger.warning(f"Input {name} ({content_hash[:16]}...) not in cache")

    logger.info(f"Analyzed {len(analysis_results)} inputs")

    # Phase 2: Plan
    logger.info("Phase 2: Generating execution plan...")

    recipe = Recipe.from_yaml(recipe_yaml)
    planner = RecipePlanner(use_tree_reduction=True)

    plan = planner.plan(
        recipe=recipe,
        input_hashes=input_hashes,
        analysis=analysis_results,
    )

    logger.info(f"Generated plan with {len(plan.steps)} steps")

    # Save plan for debugging
    PLAN_CACHE_DIR.mkdir(parents=True, exist_ok=True)
    plan_path = PLAN_CACHE_DIR / f"{plan.plan_id}.json"
    with open(plan_path, "w") as f:
        f.write(plan.to_json())

    # Phase 3: Execute
    logger.info("Phase 3: Executing plan...")

    result = run_plan(plan.to_json(), run_id=run_id)

    return {
        "status": result.get("status"),
        "run_id": run_id,
        "recipe": recipe.name,
        "plan_id": plan.plan_id,
        "output_path": result.get("output_path"),
        "output_cache_id": result.get("output_cache_id"),
        "output_ipfs_cid": result.get("output_ipfs_cid"),
        "analysis_count": len(analysis_results),
        "total_steps": len(plan.steps),
        "cached": result.get("cached", 0),
        "executed": result.get("executed", 0),
        "error": result.get("error"),
    }


@app.task(bind=True, name='tasks.generate_plan')
def generate_plan(
    self,
    recipe_yaml: str,
    input_hashes: Dict[str, str],
    features: List[str] = None,
) -> dict:
    """
    Generate an execution plan without executing it.

    Useful for:
    - Previewing what will be executed
    - Checking cache status
    - Debugging recipe issues

    Args:
        recipe_yaml: Recipe YAML content
        input_hashes: Mapping from input name to content hash
        features: Features to extract for analysis

    Returns:
        Dict with plan details
    """
    if RecipePlanner is None or Analyzer is None:
        raise ImportError("artdag modules not available")

    if features is None:
        features = ["beats", "energy"]

    cache_mgr = get_cache_manager()

    # Analyze inputs
    ANALYSIS_CACHE_DIR.mkdir(parents=True, exist_ok=True)
    analyzer = Analyzer(cache_dir=ANALYSIS_CACHE_DIR)

    analysis_results = {}
    for name, content_hash in input_hashes.items():
        path = cache_mgr.get_by_content_hash(content_hash)
        if path:
            try:
                result = analyzer.analyze(
                    input_hash=content_hash,
                    features=features,
                    input_path=Path(path),
                )
                analysis_results[content_hash] = result
            except Exception as e:
                logger.warning(f"Analysis failed for {name}: {e}")

    # Generate plan
    recipe = Recipe.from_yaml(recipe_yaml)
    planner = RecipePlanner(use_tree_reduction=True)

    plan = planner.plan(
        recipe=recipe,
        input_hashes=input_hashes,
        analysis=analysis_results,
    )

    # Check cache status for each step
    steps_status = []
    for step in plan.steps:
        cached = cache_mgr.has_content(step.cache_id)
        steps_status.append({
            "step_id": step.step_id,
            "node_type": step.node_type,
            "cache_id": step.cache_id,
            "level": step.level,
            "cached": cached,
        })

    cached_count = sum(1 for s in steps_status if s["cached"])

    return {
        "status": "planned",
        "recipe": recipe.name,
        "plan_id": plan.plan_id,
        "total_steps": len(plan.steps),
        "cached_steps": cached_count,
        "pending_steps": len(plan.steps) - cached_count,
        "steps": steps_status,
        "plan_json": plan.to_json(),
    }