#!/usr/bin/env python3
"""Validate Gauntlet checklist YAML files against the checklist JSON schema.

Usage:
  validate-checklist           Validate all checklists + print summary
  validate-checklist --check   Schema validation only (for pre-PR chain)

Exit code 0 = all valid, 1 = validation errors found.
"""

import json
import sys
from pathlib import Path

import jsonschema
import yaml

ROOT = Path(__file__).resolve().parent.parent
SCHEMA_PATH = ROOT / "server" / "content" / "_schema" / "checklist.schema.json"
GAUNTLET_DIR = ROOT / "server" / "content" / "gauntlet"


def load_schema():
    if not SCHEMA_PATH.exists():
        print(f"ERROR: Schema file not found at {_rel(SCHEMA_PATH)}")
        print("Expected: content/_schema/checklist.schema.json")
        sys.exit(1)
    with open(SCHEMA_PATH) as f:
        return json.load(f)


def find_checklists():
    """Find all checklist YAML files under content/gauntlet/."""
    files = []
    if not GAUNTLET_DIR.exists():
        return files
    for path in sorted(GAUNTLET_DIR.rglob("checklist.yaml")):
        files.append(path)
    cross = GAUNTLET_DIR / "cross_room_checks.yaml"
    if cross.exists():
        files.append(cross)
    return files


def _rel(path: Path) -> str:
    try:
        return str(path.relative_to(ROOT))
    except ValueError:
        return str(path)


def validate_schema(files, schema):
    """Pass 1: JSON Schema validation. Returns (validated, errors)."""
    errors = 0
    validated = 0
    for path in files:
        rel = _rel(path)
        try:
            with open(path) as f:
                data = yaml.safe_load(f)
        except yaml.YAMLError as e:
            print(f"YAML ERROR: {rel}: {e}")
            errors += 1
            continue

        if data is None:
            print(f"EMPTY: {rel}")
            errors += 1
            continue

        try:
            jsonschema.validate(instance=data, schema=schema)
            validated += 1
        except jsonschema.ValidationError as e:
            print(f"INVALID: {rel}")
            print(f"  Error: {e.message}")
            if e.absolute_path:
                print(f"  Path:  {'.'.join(str(p) for p in e.absolute_path)}")
            errors += 1

    return validated, errors


def check_id_uniqueness(files):
    """Pass 2: Condition ID uniqueness within and across files."""
    errors = 0
    global_ids: dict[str, Path] = {}

    for path in files:
        rel = _rel(path)
        try:
            with open(path) as f:
                data = yaml.safe_load(f)
        except (yaml.YAMLError, OSError):
            continue
        if not data or not isinstance(data, dict):
            continue

        local_seen: set[str] = set()
        for cond in data.get("conditions", []):
            cid = cond.get("id")
            if not cid:
                continue
            if cid in local_seen:
                print(f'ID ERROR: duplicate condition id "{cid}" in {rel}')
                errors += 1
            local_seen.add(cid)

            if cid in global_ids and global_ids[cid] != path:
                print(f'ID ERROR: condition id "{cid}" used in multiple files')
                print(f"  First: {_rel(global_ids[cid])}")
                print(f"  Also:  {rel}")
                errors += 1
            elif cid not in global_ids:
                global_ids[cid] = path

    return errors


def summarize(files):
    """Print per-room condition counts and type breakdown."""
    total = 0
    type_counts: dict[str, int] = {}

    for path in files:
        try:
            with open(path) as f:
                data = yaml.safe_load(f)
        except (yaml.YAMLError, OSError):
            continue
        if not data or not isinstance(data, dict):
            continue

        conditions = data.get("conditions", [])
        count = len(conditions)
        total += count
        room = data.get("room_id", "cross_room")
        print(f"  {room}: {count} conditions")

        for cond in conditions:
            ct = cond.get("condition_type", "unknown")
            type_counts[ct] = type_counts.get(ct, 0) + 1

    print(f"\n  Total: {total} conditions across {len(files)} files")
    if type_counts:
        print("  By type:")
        for ct in sorted(type_counts):
            print(f"    {ct}: {type_counts[ct]}")


def main():
    check_only = "--check" in sys.argv

    if not GAUNTLET_DIR.exists():
        print(f"No gauntlet directory at {_rel(GAUNTLET_DIR)}")
        print("Checklist validation skipped (no content yet).")
        return 0

    files = find_checklists()
    if not files:
        print("No checklist files found under content/gauntlet/.")
        print("Checklist validation skipped.")
        return 0

    schema = load_schema()

    # Pass 1: Schema validation
    validated, schema_errors = validate_schema(files, schema)
    print(f"Pass 1 (schema): {validated} valid, {schema_errors} errors")

    if schema_errors > 0:
        print(f"\nSchema validation failed ({schema_errors} errors) — skipping ID checks")
        return 1

    # Pass 2: Condition ID uniqueness
    id_errors = check_id_uniqueness(files)
    if id_errors > 0:
        print(f"Pass 2 (IDs): {id_errors} errors")

    total_errors = schema_errors + id_errors
    print(f"\nChecklist validation: {validated} valid, {total_errors} errors")

    if total_errors > 0:
        return 1

    if not check_only:
        print("\nChecklist summary:")
        summarize(files)

    return 0


if __name__ == "__main__":
    sys.exit(main())