#!/usr/bin/env python3
"""
Pack Loader for Attune

This script loads a pack from the filesystem into the database.
It reads pack.yaml, action definitions, trigger definitions, and sensor definitions
and creates all necessary database entries.

Usage:
    python3 scripts/load_core_pack.py [--database-url URL] [--pack-dir DIR] [--pack-name NAME]

Environment Variables:
    DATABASE_URL: PostgreSQL connection string (default: from config or localhost)
    ATTUNE_PACKS_DIR: Base directory for packs (default: ./packs)
"""

import argparse
import json
import os
import sys
from pathlib import Path
from typing import Any, Dict, List, Optional

import psycopg2
import psycopg2.extras
import yaml

# Default configuration
DEFAULT_DATABASE_URL = "postgresql://postgres:postgres@localhost:5432/attune"
DEFAULT_PACKS_DIR = "./packs"


def generate_label(name: str) -> str:
    """Generate a human-readable label from a name.

    Examples:
        'crontimer' -> 'Crontimer'
        'http_request' -> 'Http Request'
        'datetime_timer' -> 'Datetime Timer'
    """
    # Replace underscores with spaces and capitalize each word
    return " ".join(word.capitalize() for word in name.replace("_", " ").split())


class PackLoader:
    """Loads a pack into the database"""

    def __init__(
        self, database_url: str, packs_dir: Path, pack_name: str, schema: str = "public"
    ):
        self.database_url = database_url
        self.packs_dir = packs_dir
        self.pack_name = pack_name
        self.pack_dir = packs_dir / pack_name
        self.schema = schema
        self.conn = None
        self.pack_id = None
        self.pack_ref = None

    def connect(self):
        """Connect to the database"""
        print(f"Connecting to database...")
        self.conn = psycopg2.connect(self.database_url)
        self.conn.autocommit = False

        # Set search_path to use the correct schema
        cursor = self.conn.cursor()
        cursor.execute(f"SET search_path TO {self.schema}, public")
        cursor.close()
        self.conn.commit()

        print(f"✓ Connected to database (schema: {self.schema})")

    def close(self):
        """Close database connection"""
        if self.conn:
            self.conn.close()

    def load_yaml(self, file_path: Path) -> Dict[str, Any]:
        """Load and parse YAML file"""
        with open(file_path, "r") as f:
            return yaml.safe_load(f)

    def upsert_pack(self) -> int:
        """Create or update the pack"""
        print("\n→ Loading pack metadata...")

        pack_yaml_path = self.pack_dir / "pack.yaml"
        if not pack_yaml_path.exists():
            raise FileNotFoundError(f"pack.yaml not found at {pack_yaml_path}")

        pack_data = self.load_yaml(pack_yaml_path)

        cursor = self.conn.cursor()

        # Prepare pack data
        ref = pack_data["ref"]
        self.pack_ref = ref
        label = pack_data["label"]
        description = pack_data.get("description", "")
        version = pack_data["version"]
        conf_schema = json.dumps(pack_data.get("conf_schema", {}))
        config = json.dumps(pack_data.get("config", {}))
        meta = json.dumps(pack_data.get("meta", {}))
        tags = pack_data.get("tags", [])
        runtime_deps = pack_data.get("runtime_deps", [])
        is_standard = pack_data.get("system", False)

        # Upsert pack
        cursor.execute(
            """
            INSERT INTO pack (
                ref, label, description, version,
                conf_schema, config, meta, tags, runtime_deps, is_standard
            )
            VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (ref) DO UPDATE SET
                label = EXCLUDED.label,
                description = EXCLUDED.description,
                version = EXCLUDED.version,
                conf_schema = EXCLUDED.conf_schema,
                config = EXCLUDED.config,
                meta = EXCLUDED.meta,
                tags = EXCLUDED.tags,
                runtime_deps = EXCLUDED.runtime_deps,
                is_standard = EXCLUDED.is_standard,
                updated = NOW()
            RETURNING id
        """,
            (
                ref,
                label,
                description,
                version,
                conf_schema,
                config,
                meta,
                tags,
                runtime_deps,
                is_standard,
            ),
        )

        self.pack_id = cursor.fetchone()[0]
        cursor.close()

        print(f"✓ Pack '{ref}' loaded (ID: {self.pack_id})")
        return self.pack_id

    def upsert_triggers(self) -> Dict[str, int]:
        """Load trigger definitions"""
        print("\n→ Loading triggers...")

        triggers_dir = self.pack_dir / "triggers"
        if not triggers_dir.exists():
            print("  No triggers directory found")
            return {}

        trigger_ids = {}
        cursor = self.conn.cursor()

        for yaml_file in sorted(triggers_dir.glob("*.yaml")):
            trigger_data = self.load_yaml(yaml_file)

            # Use ref from YAML (new format) or construct from name (old format)
            ref = trigger_data.get("ref")
            if not ref:
                # Fallback for old format - should not happen with new pack format
                ref = f"{self.pack_ref}.{trigger_data['name']}"

            # Extract name from ref for label generation
            name = ref.split(".")[-1] if "." in ref else ref
            label = trigger_data.get("label") or generate_label(name)
            description = trigger_data.get("description", "")
            enabled = trigger_data.get("enabled", True)
            param_schema = json.dumps(trigger_data.get("parameters", {}))
            out_schema = json.dumps(trigger_data.get("output", {}))

            cursor.execute(
                """
                INSERT INTO trigger (
                    ref, pack, pack_ref, label, description,
                    enabled, param_schema, out_schema, is_adhoc
                )
                VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s)
                ON CONFLICT (ref) DO UPDATE SET
                    label = EXCLUDED.label,
                    description = EXCLUDED.description,
                    enabled = EXCLUDED.enabled,
                    param_schema = EXCLUDED.param_schema,
                    out_schema = EXCLUDED.out_schema,
                    updated = NOW()
                RETURNING id
            """,
                (
                    ref,
                    self.pack_id,
                    self.pack_ref,
                    label,
                    description,
                    enabled,
                    param_schema,
                    out_schema,
                    False,  # Pack-installed triggers are not ad-hoc
                ),
            )

            trigger_id = cursor.fetchone()[0]
            trigger_ids[ref] = trigger_id
            print(f"  ✓ Trigger '{ref}' (ID: {trigger_id})")

        cursor.close()
        return trigger_ids

    def upsert_actions(self) -> Dict[str, int]:
        """Load action definitions"""
        print("\n→ Loading actions...")

        actions_dir = self.pack_dir / "actions"
        if not actions_dir.exists():
            print("  No actions directory found")
            return {}

        action_ids = {}
        cursor = self.conn.cursor()

        # First, ensure we have a runtime for actions
        runtime_id = self.ensure_shell_runtime(cursor)

        for yaml_file in sorted(actions_dir.glob("*.yaml")):
            action_data = self.load_yaml(yaml_file)

            # Use ref from YAML (new format) or construct from name (old format)
            ref = action_data.get("ref")
            if not ref:
                # Fallback for old format - should not happen with new pack format
                ref = f"{self.pack_ref}.{action_data['name']}"

            # Extract name from ref for label generation and entrypoint detection
            name = ref.split(".")[-1] if "." in ref else ref
            label = action_data.get("label") or generate_label(name)
            description = action_data.get("description", "")

            # Determine entrypoint
            entrypoint = action_data.get("entry_point", "")
            if not entrypoint:
                # Try to find corresponding script file
                for ext in [".sh", ".py"]:
                    script_path = actions_dir / f"{name}{ext}"
                    if script_path.exists():
                        entrypoint = str(script_path.relative_to(self.packs_dir))
                        break

            param_schema = json.dumps(action_data.get("parameters", {}))
            out_schema = json.dumps(action_data.get("output", {}))

            # Parameter delivery and format (defaults: stdin + json for security)
            parameter_delivery = action_data.get("parameter_delivery", "stdin").lower()
            parameter_format = action_data.get("parameter_format", "json").lower()

            # Output format (defaults: text for no parsing)
            output_format = action_data.get("output_format", "text").lower()

            # Validate parameter delivery method (only stdin and file allowed)
            if parameter_delivery not in ["stdin", "file"]:
                print(
                    f"  ⚠ Invalid parameter_delivery '{parameter_delivery}' for '{ref}', defaulting to 'stdin'"
                )
                parameter_delivery = "stdin"

            # Validate parameter format
            if parameter_format not in ["dotenv", "json", "yaml"]:
                print(
                    f"  ⚠ Invalid parameter_format '{parameter_format}' for '{ref}', defaulting to 'json'"
                )
                parameter_format = "json"

            # Validate output format
            if output_format not in ["text", "json", "yaml", "jsonl"]:
                print(
                    f"  ⚠ Invalid output_format '{output_format}' for '{ref}', defaulting to 'text'"
                )
                output_format = "text"

            cursor.execute(
                """
                INSERT INTO action (
                    ref, pack, pack_ref, label, description,
                    entrypoint, runtime, param_schema, out_schema, is_adhoc,
                    parameter_delivery, parameter_format, output_format
                )
                VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
                ON CONFLICT (ref) DO UPDATE SET
                    label = EXCLUDED.label,
                    description = EXCLUDED.description,
                    entrypoint = EXCLUDED.entrypoint,
                    param_schema = EXCLUDED.param_schema,
                    out_schema = EXCLUDED.out_schema,
                    parameter_delivery = EXCLUDED.parameter_delivery,
                    parameter_format = EXCLUDED.parameter_format,
                    output_format = EXCLUDED.output_format,
                    updated = NOW()
                RETURNING id
            """,
                (
                    ref,
                    self.pack_id,
                    self.pack_ref,
                    label,
                    description,
                    entrypoint,
                    runtime_id,
                    param_schema,
                    out_schema,
                    False,  # Pack-installed actions are not ad-hoc
                    parameter_delivery,
                    parameter_format,
                    output_format,
                ),
            )

            action_id = cursor.fetchone()[0]
            action_ids[ref] = action_id
            print(f"  ✓ Action '{ref}' (ID: {action_id})")

        cursor.close()
        return action_ids

    def ensure_shell_runtime(self, cursor) -> int:
        """Ensure shell runtime exists"""
        cursor.execute(
            """
            INSERT INTO runtime (
                ref, pack, pack_ref, name, description, distributions
            )
            VALUES (%s, %s, %s, %s, %s, %s)
            ON CONFLICT (ref) DO UPDATE SET
                name = EXCLUDED.name,
                description = EXCLUDED.description,
                updated = NOW()
            RETURNING id
        """,
            (
                "core.action.shell",
                self.pack_id,
                self.pack_ref,
                "Shell",
                "Shell script runtime",
                json.dumps({"shell": {"command": "sh"}}),
            ),
        )
        return cursor.fetchone()[0]

    def upsert_sensors(self, trigger_ids: Dict[str, int]) -> Dict[str, int]:
        """Load sensor definitions"""
        print("\n→ Loading sensors...")

        sensors_dir = self.pack_dir / "sensors"
        if not sensors_dir.exists():
            print("  No sensors directory found")
            return {}

        sensor_ids = {}
        cursor = self.conn.cursor()

        # Ensure sensor runtime exists
        sensor_runtime_id = self.ensure_sensor_runtime(cursor)

        for yaml_file in sorted(sensors_dir.glob("*.yaml")):
            sensor_data = self.load_yaml(yaml_file)

            # Use ref from YAML (new format) or construct from name (old format)
            ref = sensor_data.get("ref")
            if not ref:
                # Fallback for old format - should not happen with new pack format
                ref = f"{self.pack_ref}.{sensor_data['name']}"

            # Extract name from ref for label generation and entrypoint detection
            name = ref.split(".")[-1] if "." in ref else ref
            label = sensor_data.get("label") or generate_label(name)
            description = sensor_data.get("description", "")
            enabled = sensor_data.get("enabled", True)

            # Get trigger reference (handle both trigger_type and trigger_types)
            trigger_types = sensor_data.get("trigger_types", [])
            if not trigger_types:
                # Fallback to singular trigger_type
                trigger_type = sensor_data.get("trigger_type", "")
                trigger_types = [trigger_type] if trigger_type else []

            # Use the first trigger type (sensors currently support one trigger)
            trigger_ref = None
            trigger_id = None
            if trigger_types:
                # Check if it's already a full ref or just the type name
                first_trigger = trigger_types[0]
                if "." in first_trigger:
                    trigger_ref = first_trigger
                else:
                    trigger_ref = f"{self.pack_ref}.{first_trigger}"
                trigger_id = trigger_ids.get(trigger_ref)

            # Determine entrypoint
            entry_point = sensor_data.get("entry_point", "")
            if not entry_point:
                for ext in [".py", ".sh"]:
                    script_path = sensors_dir / f"{name}{ext}"
                    if script_path.exists():
                        entry_point = str(script_path.relative_to(self.packs_dir))
                        break

            config = json.dumps(sensor_data.get("config", {}))

            cursor.execute(
                """
                INSERT INTO sensor (
                    ref, pack, pack_ref, label, description,
                    entrypoint, runtime, runtime_ref, trigger, trigger_ref,
                    enabled, config
                )
                VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
                ON CONFLICT (ref) DO UPDATE SET
                    label = EXCLUDED.label,
                    description = EXCLUDED.description,
                    entrypoint = EXCLUDED.entrypoint,
                    trigger = EXCLUDED.trigger,
                    trigger_ref = EXCLUDED.trigger_ref,
                    enabled = EXCLUDED.enabled,
                    config = EXCLUDED.config,
                    updated = NOW()
                RETURNING id
            """,
                (
                    ref,
                    self.pack_id,
                    self.pack_ref,
                    label,
                    description,
                    entry_point,
                    sensor_runtime_id,
                    "core.sensor.builtin",
                    trigger_id,
                    trigger_ref,
                    enabled,
                    config,
                ),
            )

            sensor_id = cursor.fetchone()[0]
            sensor_ids[ref] = sensor_id
            print(f"  ✓ Sensor '{ref}' (ID: {sensor_id})")

        cursor.close()
        return sensor_ids

    def ensure_sensor_runtime(self, cursor) -> int:
        """Ensure sensor runtime exists"""
        cursor.execute(
            """
            INSERT INTO runtime (
                ref, pack, pack_ref, name, description, distributions
            )
            VALUES (%s, %s, %s, %s, %s, %s)
            ON CONFLICT (ref) DO UPDATE SET
                name = EXCLUDED.name,
                description = EXCLUDED.description,
                updated = NOW()
            RETURNING id
        """,
            (
                "core.sensor.builtin",
                self.pack_id,
                self.pack_ref,
                "Built-in Sensor",
                "Built-in sensor runtime",
                json.dumps([]),
            ),
        )
        return cursor.fetchone()[0]

    def load_pack(self):
        """Main loading process"""
        print("=" * 60)
        print(f"Pack Loader - {self.pack_name}")
        print("=" * 60)

        if not self.pack_dir.exists():
            raise FileNotFoundError(f"Pack directory not found: {self.pack_dir}")

        try:
            self.connect()

            # Load pack metadata
            self.upsert_pack()

            # Load triggers
            trigger_ids = self.upsert_triggers()

            # Load actions
            action_ids = self.upsert_actions()

            # Load sensors
            sensor_ids = self.upsert_sensors(trigger_ids)

            # Commit all changes
            self.conn.commit()

            print("\n" + "=" * 60)
            print(f"✓ Pack '{self.pack_name}' loaded successfully!")
            print("=" * 60)
            print(f"  Pack ID: {self.pack_id}")
            print(f"  Triggers: {len(trigger_ids)}")
            print(f"  Actions: {len(action_ids)}")
            print(f"  Sensors: {len(sensor_ids)}")
            print()

        except Exception as e:
            if self.conn:
                self.conn.rollback()
            print(f"\n✗ Error loading pack '{self.pack_name}': {e}")
            import traceback

            traceback.print_exc()
            sys.exit(1)
        finally:
            self.close()


def main():
    parser = argparse.ArgumentParser(description="Load a pack into the Attune database")
    parser.add_argument(
        "--database-url",
        default=os.getenv("DATABASE_URL", DEFAULT_DATABASE_URL),
        help=f"PostgreSQL connection string (default: {DEFAULT_DATABASE_URL})",
    )
    parser.add_argument(
        "--pack-dir",
        type=Path,
        default=Path(os.getenv("ATTUNE_PACKS_DIR", DEFAULT_PACKS_DIR)),
        help=f"Base directory for packs (default: {DEFAULT_PACKS_DIR})",
    )
    parser.add_argument(
        "--pack-name",
        default="core",
        help="Name of the pack to load (default: core)",
    )
    parser.add_argument(
        "--schema",
        default=os.getenv("DB_SCHEMA", "public"),
        help="Database schema to use (default: public)",
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Print what would be done without making changes",
    )

    args = parser.parse_args()

    if args.dry_run:
        print("DRY RUN MODE: No changes will be made")
        print()

    loader = PackLoader(args.database_url, args.pack_dir, args.pack_name, args.schema)
    loader.load_pack()


if __name__ == "__main__":
    main()