"""
Placeholder Metadata Extractor

Automatically extracts metadata from existing codebase for all placeholders.
This module bridges the gap between legacy implementation and normative standard.
"""
import re
import inspect
from typing import Dict, List, Optional, Tuple, Any
from placeholder_metadata import (
    PlaceholderMetadata,
    PlaceholderMetadataRegistry,
    PlaceholderType,
    TimeWindow,
    OutputType,
    SourceInfo,
    MissingValuePolicy,
    ExceptionHandling,
    ConfidenceLogic,
    QualityFilterPolicy,
    UsedBy,
    METADATA_REGISTRY
)


# ── Heuristics ────────────────────────────────────────────────────────────────

def infer_type_from_key(key: str, description: str) -> PlaceholderType:
    """
    Infer placeholder type from key and description.

    Heuristics:
    - JSON/Markdown in name → interpreted or raw_data
    - "score", "pct", "ratio" → atomic
    - "summary", "detail" → raw_data or interpreted
    """
    key_lower = key.lower()
    desc_lower = description.lower()

    # JSON/Markdown outputs
    if '_json' in key_lower or '_md' in key_lower:
        return PlaceholderType.RAW_DATA

    # Scores and percentages are atomic
    if any(x in key_lower for x in ['score', 'pct', '_vs_', 'ratio', 'adequacy']):
        return PlaceholderType.ATOMIC

    # Summaries and details
    if any(x in key_lower for x in ['summary', 'detail', 'verteilung', 'distribution']):
        return PlaceholderType.RAW_DATA

    # Goals and focus areas (interpreted)
    if any(x in key_lower for x in ['goal', 'focus', 'top_']):
        return PlaceholderType.INTERPRETED

    # Correlations are interpreted
    if 'correlation' in key_lower or 'plateau' in key_lower or 'driver' in key_lower:
        return PlaceholderType.INTERPRETED

    # Default: atomic
    return PlaceholderType.ATOMIC


def infer_time_window_from_key(key: str) -> TimeWindow:
    """
    Infer time window from placeholder key.

    Patterns:
    - _7d → 7d
    - _28d → 28d
    - _30d → 30d
    - _90d → 90d
    - aktuell, latest, current → latest
    - avg, median → usually 28d or 30d (default to 30d)
    """
    key_lower = key.lower()

    # Explicit time windows
    if '_7d' in key_lower:
        return TimeWindow.DAYS_7
    if '_14d' in key_lower:
        return TimeWindow.DAYS_14
    if '_28d' in key_lower:
        return TimeWindow.DAYS_28
    if '_30d' in key_lower:
        return TimeWindow.DAYS_30
    if '_90d' in key_lower:
        return TimeWindow.DAYS_90

    # Latest/current
    if any(x in key_lower for x in ['aktuell', 'latest', 'current', 'letzt']):
        return TimeWindow.LATEST

    # Averages default to 30d
    if 'avg' in key_lower or 'durchschn' in key_lower:
        return TimeWindow.DAYS_30

    # Trends default to 28d
    if 'trend' in key_lower:
        return TimeWindow.DAYS_28

    # Week-based metrics
    if 'week' in key_lower or 'woche' in key_lower:
        return TimeWindow.DAYS_7

    # Profile data is always latest
    if key_lower in ['name', 'age', 'height', 'geschlecht']:
        return TimeWindow.LATEST

    # Default: unknown
    return TimeWindow.UNKNOWN


def infer_output_type_from_key(key: str) -> OutputType:
    """
    Infer output data type from key.

    Heuristics:
    - _json → json
    - _md → markdown
    - score, pct, ratio → integer
    - avg, median, delta, change → number
    - name, geschlecht → string
    - datum, date → date
    """
    key_lower = key.lower()

    if '_json' in key_lower:
        return OutputType.JSON
    if '_md' in key_lower:
        return OutputType.MARKDOWN
    if key_lower in ['datum_heute', 'zeitraum_7d', 'zeitraum_30d', 'zeitraum_90d']:
        return OutputType.DATE
    if any(x in key_lower for x in ['score', 'pct', 'count', 'days', 'frequency']):
        return OutputType.INTEGER
    if any(x in key_lower for x in ['avg', 'median', 'delta', 'change', 'slope',
                                     'weight', 'ratio', 'balance', 'trend']):
        return OutputType.NUMBER
    if key_lower in ['name', 'geschlecht', 'quadrant']:
        return OutputType.STRING

    # Default: string (most placeholders format to string for AI)
    return OutputType.STRING


def infer_unit_from_key_and_description(key: str, description: str) -> Optional[str]:
    """
    Infer unit from key and description.

    Common units:
    - weight → kg
    - duration, time → Stunden or Minuten
    - percentage → %
    - distance → km
    - heart rate → bpm
    """
    key_lower = key.lower()
    desc_lower = description.lower()

    # Weight
    if 'weight' in key_lower or 'gewicht' in key_lower or any(x in key_lower for x in ['fm_', 'lbm_']):
        return 'kg'

    # Body fat, percentages
    if any(x in key_lower for x in ['kf_', 'pct', '_bf', 'adequacy', 'score',
                                     'balance', 'compliance', 'quality']):
        return '%'

    # Circumferences
    if any(x in key_lower for x in ['umfang', 'waist', 'hip', 'chest', 'arm', 'leg']):
        return 'cm'

    # Time/duration
    if any(x in key_lower for x in ['duration', 'dauer', 'hours', 'stunden', 'minutes', 'debt']):
        if 'hours' in desc_lower or 'stunden' in desc_lower:
            return 'Stunden'
        elif 'minutes' in desc_lower or 'minuten' in desc_lower:
            return 'Minuten'
        else:
            return 'Stunden'  # Default

    # Heart rate
    if 'hr' in key_lower or 'herzfrequenz' in key_lower or 'puls' in key_lower:
        return 'bpm'

    # HRV
    if 'hrv' in key_lower:
        return 'ms'

    # VO2 Max
    if 'vo2' in key_lower:
        return 'ml/kg/min'

    # Calories/energy
    if 'kcal' in key_lower or 'energy' in key_lower or 'energie' in key_lower:
        return 'kcal'

    # Macros
    if any(x in key_lower for x in ['protein', 'carb', 'fat', 'kohlenhydrat', 'fett']):
        return 'g'

    # Height
    if 'height' in key_lower or 'größe' in key_lower:
        return 'cm'

    # Age
    if 'age' in key_lower or 'alter' in key_lower:
        return 'Jahre'

    # BMI
    if 'bmi' in key_lower:
        return None  # BMI has no unit

    # Load
    if 'load' in key_lower:
        return None  # Unitless

    # Default: None
    return None


def extract_resolver_name(resolver_func) -> str:
    """
    Extract resolver function name from lambda or function.

    Most resolvers are lambdas like: lambda pid: function_name(pid)
    We want to extract the function_name.
    """
    try:
        # Get source code of lambda
        source = inspect.getsource(resolver_func).strip()

        # Pattern: lambda pid: function_name(...)
        match = re.search(r'lambda\s+\w+:\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*\(', source)
        if match:
            return match.group(1)

        # Pattern: direct function reference
        if hasattr(resolver_func, '__name__'):
            return resolver_func.__name__

    except (OSError, TypeError):
        pass

    return "unknown"


def analyze_data_layer_usage(resolver_name: str) -> Tuple[Optional[str], Optional[str], List[str]]:
    """
    Analyze which data_layer function and tables are used.

    Returns: (data_layer_function, data_layer_module, source_tables)

    This is a heuristic analysis based on naming patterns.
    """
    # Map common resolver patterns to data layer modules
    data_layer_mapping = {
        'get_latest_weight': ('get_latest_weight_data', 'body_metrics', ['weight_log']),
        'get_weight_trend': ('get_weight_trend_data', 'body_metrics', ['weight_log']),
        'get_latest_bf': ('get_body_composition_data', 'body_metrics', ['caliper_log']),
        'get_circ_summary': ('get_circumference_summary_data', 'body_metrics', ['circumference_log']),
        'get_caliper_summary': ('get_body_composition_data', 'body_metrics', ['caliper_log']),

        # Nutrition
        'get_nutrition_avg': ('get_nutrition_average_data', 'nutrition_metrics', ['nutrition_log']),
        'get_protein_per_kg': ('get_protein_targets_data', 'nutrition_metrics', ['nutrition_log', 'weight_log']),

        # Activity
        'get_activity_summary': ('get_activity_summary_data', 'activity_metrics', ['activity_log']),
        'get_activity_detail': ('get_activity_detail_data', 'activity_metrics', ['activity_log', 'training_types']),
        'get_training_type_dist': ('get_training_type_distribution_data', 'activity_metrics', ['activity_log', 'training_types']),

        # Sleep
        'get_sleep_duration': ('get_sleep_duration_data', 'recovery_metrics', ['sleep_log']),
        'get_sleep_quality': ('get_sleep_quality_data', 'recovery_metrics', ['sleep_log']),

        # Vitals
        'get_resting_hr': ('get_resting_heart_rate_data', 'health_metrics', ['vitals_baseline']),
        'get_hrv': ('get_heart_rate_variability_data', 'health_metrics', ['vitals_baseline']),
        'get_vo2_max': ('get_vo2_max_data', 'health_metrics', ['vitals_baseline']),

        # Goals
        '_safe_json': (None, None, ['goals', 'focus_area_definitions', 'goal_focus_contributions']),
        '_safe_str': (None, None, []),
        '_safe_int': (None, None, []),
        '_safe_float': (None, None, []),
    }

    # Try to find mapping
    for pattern, (func, module, tables) in data_layer_mapping.items():
        if pattern in resolver_name:
            return func, module, tables

    # Default: unknown
    return None, None, []


# ── Main Extraction ───────────────────────────────────────────────────────────

def extract_metadata_from_placeholder_map(
    placeholder_map: Dict[str, Any],
    catalog: Dict[str, List[Dict[str, str]]]
) -> Dict[str, PlaceholderMetadata]:
    """
    Extract metadata for all placeholders from PLACEHOLDER_MAP and catalog.

    Args:
        placeholder_map: The PLACEHOLDER_MAP dict from placeholder_resolver
        catalog: The catalog from get_placeholder_catalog()

    Returns:
        Dict mapping key to PlaceholderMetadata
    """
    # Flatten catalog for easy lookup
    catalog_flat = {}
    for category, items in catalog.items():
        for item in items:
            catalog_flat[item['key']] = {
                'category': category,
                'description': item['description']
            }

    metadata_dict = {}

    for placeholder_full, resolver_func in placeholder_map.items():
        # Extract key (remove {{ }})
        key = placeholder_full.replace('{{', '').replace('}}', '')

        # Get catalog info
        catalog_info = catalog_flat.get(key, {
            'category': 'Unknown',
            'description': 'No description available'
        })

        category = catalog_info['category']
        description = catalog_info['description']

        # Extract resolver name
        resolver_name = extract_resolver_name(resolver_func)

        # Infer metadata using heuristics
        ptype = infer_type_from_key(key, description)
        time_window = infer_time_window_from_key(key)
        output_type = infer_output_type_from_key(key)
        unit = infer_unit_from_key_and_description(key, description)

        # Analyze data layer usage
        dl_func, dl_module, source_tables = analyze_data_layer_usage(resolver_name)

        # Build source info
        source = SourceInfo(
            resolver=resolver_name,
            module="placeholder_resolver.py",
            function=dl_func,
            data_layer_module=dl_module,
            source_tables=source_tables
        )

        # Build semantic contract (enhanced description)
        semantic_contract = build_semantic_contract(key, description, time_window, ptype)

        # Format hint
        format_hint = build_format_hint(key, unit, output_type)

        # Create metadata
        metadata = PlaceholderMetadata(
            key=key,
            placeholder=placeholder_full,
            category=category,
            type=ptype,
            description=description,
            semantic_contract=semantic_contract,
            unit=unit,
            time_window=time_window,
            output_type=output_type,
            format_hint=format_hint,
            example_output=None,  # Will be filled at runtime
            source=source,
            dependencies=['profile_id'],  # All placeholders depend on profile_id
            used_by=UsedBy(),  # Will be filled by usage analysis
            version="1.0.0",
            deprecated=False,
            known_issues=[],
            notes=[]
        )

        metadata_dict[key] = metadata

    return metadata_dict


def build_semantic_contract(key: str, description: str, time_window: TimeWindow, ptype: PlaceholderType) -> str:
    """
    Build detailed semantic contract from available information.
    """
    base = description

    # Add time window info
    if time_window == TimeWindow.LATEST:
        base += " (letzter verfügbarer Wert)"
    elif time_window != TimeWindow.UNKNOWN:
        base += f" (Zeitfenster: {time_window.value})"

    # Add type info
    if ptype == PlaceholderType.INTERPRETED:
        base += " [KI-interpretiert]"
    elif ptype == PlaceholderType.RAW_DATA:
        base += " [Strukturierte Rohdaten]"

    return base


def build_format_hint(key: str, unit: Optional[str], output_type: OutputType) -> Optional[str]:
    """
    Build format hint based on key, unit, and output type.
    """
    if output_type == OutputType.JSON:
        return "JSON object"
    elif output_type == OutputType.MARKDOWN:
        return "Markdown-formatted text"
    elif output_type == OutputType.DATE:
        return "YYYY-MM-DD"
    elif unit:
        if output_type == OutputType.NUMBER:
            return f"12.3 {unit}"
        elif output_type == OutputType.INTEGER:
            return f"85 {unit}"
        else:
            return f"Wert {unit}"
    else:
        if output_type == OutputType.NUMBER:
            return "12.3"
        elif output_type == OutputType.INTEGER:
            return "85"
        else:
            return "Text"


# ── Usage Analysis ────────────────────────────────────────────────────────────

def analyze_placeholder_usage(profile_id: str) -> Dict[str, UsedBy]:
    """
    Analyze where each placeholder is used (prompts, pipelines, charts).

    This requires database access to check ai_prompts table.

    Returns dict mapping placeholder key to UsedBy object.
    """
    from db import get_db, get_cursor, r2d

    usage_map: Dict[str, UsedBy] = {}

    with get_db() as conn:
        cur = get_cursor(conn)

        # Get all prompts
        cur.execute("SELECT name, template, stages FROM ai_prompts")
        prompts = [r2d(row) for row in cur.fetchall()]

        # Analyze each prompt
        for prompt in prompts:
            # Check template
            template = prompt.get('template') or ''
            if template:  # Only process if template is not empty/None
                found_placeholders = re.findall(r'\{\{(\w+)\}\}', template)

                for ph_key in found_placeholders:
                    if ph_key not in usage_map:
                        usage_map[ph_key] = UsedBy()
                    if prompt['name'] not in usage_map[ph_key].prompts:
                        usage_map[ph_key].prompts.append(prompt['name'])

            # Check stages (pipeline prompts)
            stages = prompt.get('stages')
            if stages:
                for stage in stages:
                    for stage_prompt in stage.get('prompts', []):
                        template = stage_prompt.get('template') or ''
                        if not template:  # Skip if template is None/empty
                            continue
                        found_placeholders = re.findall(r'\{\{(\w+)\}\}', template)

                        for ph_key in found_placeholders:
                            if ph_key not in usage_map:
                                usage_map[ph_key] = UsedBy()
                            if prompt['name'] not in usage_map[ph_key].pipelines:
                                usage_map[ph_key].pipelines.append(prompt['name'])

    return usage_map


# ── Main Entry Point ──────────────────────────────────────────────────────────

def build_complete_metadata_registry(profile_id: str = None) -> PlaceholderMetadataRegistry:
    """
    Build complete metadata registry by extracting from codebase.

    Args:
        profile_id: Optional profile ID for usage analysis

    Returns:
        PlaceholderMetadataRegistry with all metadata
    """
    from placeholder_resolver import PLACEHOLDER_MAP, get_placeholder_catalog

    # Get catalog (use dummy profile if not provided)
    if not profile_id:
        # Use first available profile or create dummy
        from db import get_db, get_cursor
        with get_db() as conn:
            cur = get_cursor(conn)
            cur.execute("SELECT id FROM profiles LIMIT 1")
            row = cur.fetchone()
            profile_id = row['id'] if row else 'dummy'

    catalog = get_placeholder_catalog(profile_id)

    # Extract base metadata
    metadata_dict = extract_metadata_from_placeholder_map(PLACEHOLDER_MAP, catalog)

    # Analyze usage
    if profile_id != 'dummy':
        usage_map = analyze_placeholder_usage(profile_id)
        for key, used_by in usage_map.items():
            if key in metadata_dict:
                metadata_dict[key].used_by = used_by

    # Register all metadata
    registry = PlaceholderMetadataRegistry()
    for metadata in metadata_dict.values():
        try:
            registry.register(metadata, validate=False)  # Don't validate during initial extraction
        except Exception as e:
            print(f"Warning: Failed to register {metadata.key}: {e}")

    return registry


if __name__ == "__main__":
    # Test extraction
    print("Building metadata registry...")
    registry = build_complete_metadata_registry()
    print(f"Extracted metadata for {registry.count()} placeholders")

    # Show sample
    all_metadata = registry.get_all()
    if all_metadata:
        sample_key = list(all_metadata.keys())[0]
        sample = all_metadata[sample_key]
        print(f"\nSample metadata for '{sample_key}':")
        print(sample.to_json())