from __future__ import annotations

import json
from pathlib import Path
import yaml

ROOT = Path(__file__).resolve().parents[1]


def main() -> int:
    # 1. Load spec/12_field_dictionary.yaml
    field_dict_path = ROOT / "spec" / "12_field_dictionary.yaml"
    if not field_dict_path.exists():
        print(f"Field dictionary not found: {field_dict_path}")
        return 1

    field_data = yaml.safe_load(field_dict_path.read_text(encoding="utf-8")) or {}
    fields = field_data.get("field_dictionary", {}).get("fields", {})

    unit_missing_count = 0
    alias_collision_count = 0
    missing_field_dictionary_count = 0

    # Build alias & canonical maps
    canonical_names = set(fields.keys())
    alias_to_canonicals: dict[str, list[str]] = {}

    for fid, info in fields.items():
        if not info:
            continue
        # Check unit missing
        unit = info.get("unit")
        if unit is None:
            unit_missing_count += 1

        canonical_name = info.get("canonical_name", fid)
        aliases = info.get("aliases", [])

        all_names = [canonical_name] + aliases
        for name in all_names:
            alias_to_canonicals.setdefault(name, []).append(fid)

    # Check alias collisions (same name maps to multiple distinct canonical fields)
    collisions = {}
    for name, canonical_list in alias_to_canonicals.items():
        unique_canonicals = sorted(list(set(canonical_list)))
        if len(unique_canonicals) > 1:
            alias_collision_count += 1
            collisions[name] = unique_canonicals

    # Helper function to check if a column name matches any canonical_name or aliases
    def is_field_mapped(col_name: str) -> bool:
        if col_name in canonical_names:
            return True
        for fid, info in fields.items():
            if not info:
                continue
            aliases = info.get("aliases", [])
            if col_name in aliases:
                return True
        return False

    # 2. Load spec/14_raw_workbook_mapping.yaml
    mapping_path = ROOT / "spec" / "14_raw_workbook_mapping.yaml"
    unmapped_columns = []
    if mapping_path.exists():
        try:
            mapping_data = yaml.safe_load(mapping_path.read_text(encoding="utf-8")) or {}
            sheets = mapping_data.get("raw_workbook", {}).get("required_sheets", {})
            for sheet_name, sheet_info in sheets.items():
                req = sheet_info.get("required_columns", [])
                rec = sheet_info.get("recommended_columns", [])
                for col in (req + rec):
                    if not is_field_mapped(col):
                        missing_field_dictionary_count += 1
                        unmapped_columns.append(f"Sheet '{sheet_name}': {col}")
        except Exception as e:
            print(f"Error parsing raw workbook mapping: {e}")

    # 3. Load spec/15_account_snapshot_contract.yaml
    snapshot_path = ROOT / "spec" / "15_account_snapshot_contract.yaml"
    unmapped_snapshot_fields = []
    if snapshot_path.exists():
        try:
            snap_data = yaml.safe_load(snapshot_path.read_text(encoding="utf-8")) or {}
            contract = snap_data.get("account_snapshot_contract", {})

            # required fields in capture groups
            groups = contract.get("required_capture_groups", {})
            for group_name, group_info in groups.items():
                fields_in_group = group_info.get("required_fields", [])
                for f in fields_in_group:
                    if not is_field_mapped(f):
                        missing_field_dictionary_count += 1
                        unmapped_snapshot_fields.append(f"Capture group '{group_name}': {f}")

            # canonical fields in contract
            canonicals = contract.get("canonical_fields", {})
            for f in canonicals.keys():
                if not is_field_mapped(f):
                    missing_field_dictionary_count += 1
                    unmapped_snapshot_fields.append(f"Canonical field: {f}")
        except Exception as e:
            print(f"Error parsing account snapshot contract: {e}")

    gate = "PASS" if (missing_field_dictionary_count == 0 and unit_missing_count == 0 and alias_collision_count == 0) else "FAIL"

    result = {
        "formula_id": "RAW_WORKBOOK_MAPPING_VALIDATION_V1",
        "missing_field_dictionary_count": missing_field_dictionary_count,
        "unit_missing_count": unit_missing_count,
        "alias_collision_count": alias_collision_count,
        "gate": gate,
        "collisions": collisions,
        "unmapped_columns": unmapped_columns,
        "unmapped_snapshot_fields": unmapped_snapshot_fields
    }

    out_path = ROOT / "Temp" / "raw_workbook_mapping_validation_v1.json"
    out_path.parent.mkdir(parents=True, exist_ok=True)
    out_path.write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding="utf-8")

    print(json.dumps(result, ensure_ascii=False, indent=2))
    return 0 if gate == "PASS" else 1


if __name__ == "__main__":
    raise SystemExit(main())