#!/usr/bin/env python3
import re
import sys


INSERT_RE = re.compile(
    r"(?P<prefix>INSERT\s+INTO\s+[^;]*?\()(?P<cols>[^)]*)(?P<suffix>\)\s+VALUES)",
    re.IGNORECASE | re.DOTALL,
)
TABLE_RE = re.compile(
    r"(?P<before>INSERT\s+INTO\s+)(?P<table>(?:\"[^\"]+\"\.|[A-Za-z_][\w$]*\.)?\"[^\"]+\"|(?:\"[^\"]+\"\.|[A-Za-z_][\w$]*\.)?[A-Za-z_][\w$]*)",
    re.IGNORECASE,
)
CREATE_DB_RE = re.compile(r"^CREATE\s+DATABASE\s+.+?;$", re.IGNORECASE | re.MULTILINE)
CONNECT_RE = re.compile(r"^\\connect\\s+.+?$", re.IGNORECASE | re.MULTILINE)


TABLE_NAME_MAP = {
    "ModelType": "model_types",
    "TypeMachine": "type_machines",
    "TypeMachineComponentRequirement": "type_machine_component_requirements",
    "TypeMachinePieceRequirement": "type_machine_piece_requirements",
    "TypeMachineProductRequirement": "type_machine_product_requirements",
    "MachinePieceLink": "machine_piece_links",
    "MachineComponentLink": "machine_component_links",
    "MachineProductLink": "machine_product_links",
    "Machine": "machines",
    "Product": "products",
    "Piece": "pieces",
    "Composant": "composants",
    "Profile": "profiles",
    "CustomField": "custom_fields",
    "CustomFieldValue": "custom_field_values",
    "Document": "documents",
    "Constructeur": "constructeurs",
    "Site": "sites",
}


SKIP_TABLES = {
    "_prisma_migrations",
}


def to_snake(name: str) -> str:
    out = []
    length = len(name)
    for i, ch in enumerate(name):
        if ch.isupper():
            prev = name[i - 1] if i > 0 else ""
            nxt = name[i + 1] if i + 1 < length else ""
            if i > 0 and (prev.islower() or prev.isdigit() or (prev.isupper() and nxt.islower())):
                out.append("_")
            out.append(ch.lower())
        else:
            out.append(ch)
    return "".join(out)


def to_lower_compact(name: str) -> str:
    return name.replace("_", "").lower()


def remap_table(ident: str, mode: str) -> str:
    mapped = TABLE_NAME_MAP.get(ident)
    if mapped is not None:
        return mapped
    if mode == "snake":
        return to_snake(ident)
    if mode == "lower":
        return to_lower_compact(ident)
    raise ValueError(f"Unsupported mode: {mode}")


def extract_table_ident(prefix: str) -> str | None:
    match = TABLE_RE.search(prefix)
    if not match:
        return None
    table = match.group("table")
    # Handle quoted schema like "public"."TableName"
    if '"."' in table:
        parts = table.split('"."', 1)
        ident = parts[1].strip('"')
    elif "." in table:
        _, ident = table.split(".", 1)
        ident = ident.strip('"')
    else:
        ident = table.strip('"')
    return ident


def normalize_table_name(prefix: str, mode: str) -> str:
    def repl(match: re.Match[str]) -> str:
        table = match.group("table")
        schema = ""
        ident = table
        # Handle quoted schema like "public"."TableName"
        if '"."' in table:
            parts = table.split('"."', 1)
            schema_name = parts[0].strip('"')
            ident = parts[1].strip('"')
            schema = f'"{schema_name}".'
        elif "." in table:
            schema_part, ident = table.split(".", 1)
            schema_name = schema_part.strip('"')
            schema = f'"{schema_name}".'
            ident = ident.strip('"')
        else:
            ident = table.strip('"')
        mapped = remap_table(ident, mode)
        return f'{match.group("before")}{schema}"{mapped}"'

    return TABLE_RE.sub(repl, prefix)


def remap_columns(cols: str, mode: str) -> str:
    def repl(match: re.Match[str]) -> str:
        name = match.group(1)
        if mode == "snake":
            if any(ch.isupper() for ch in name):
                return f"\"{to_snake(name)}\""
            return match.group(0)
        if mode == "lower":
            return f"\"{to_lower_compact(name)}\""
        raise ValueError(f"Unsupported mode: {mode}")

    return re.sub(r"\"([^\"]+)\"", repl, cols)


def normalize_dump(sql: str, mode: str) -> str:
    sql = CREATE_DB_RE.sub("", sql)
    sql = CONNECT_RE.sub("", sql)

    def repl(match: re.Match[str]) -> str:
        raw_prefix = match.group("prefix")
        ident = extract_table_ident(raw_prefix)
        if ident is not None:
            mapped = remap_table(ident, mode)
            if ident in SKIP_TABLES or mapped in SKIP_TABLES:
                return ""
        prefix = normalize_table_name(raw_prefix, mode)
        cols = remap_columns(match.group("cols"), mode)
        return f"{prefix}{cols}{match.group('suffix')}"

    return INSERT_RE.sub(repl, sql)


def main() -> int:
    if len(sys.argv) not in (3, 4):
        print("Usage: scripts/normalize-dump.py <input.sql> <output.sql> [--snake|--lower]", file=sys.stderr)
        return 1

    src = sys.argv[1]
    dst = sys.argv[2]
    mode = "lower"
    if len(sys.argv) == 4:
        if sys.argv[3] == "--snake":
            mode = "snake"
        elif sys.argv[3] == "--lower":
            mode = "lower"
        else:
            print("Invalid mode. Use --snake or --lower.", file=sys.stderr)
            return 1

    with open(src, "r", encoding="utf-8") as f:
        data = f.read()

    normalized = normalize_dump(data, mode)

    with open(dst, "w", encoding="utf-8") as f:
        f.write(normalized)

    return 0


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