from __future__ import annotations

from sqlglot import exp
from sqlglot.dialects.dialect import (
    approx_count_distinct_sql,
    arrow_json_extract_sql,
    parse_timestamp_trunc,
    rename_func,
    time_format,
)
from sqlglot.dialects.mysql import MySQL


class Doris(MySQL):
    DATE_FORMAT = "'yyyy-MM-dd'"
    DATEINT_FORMAT = "'yyyyMMdd'"
    TIME_FORMAT = "'yyyy-MM-dd HH:mm:ss'"

    class Parser(MySQL.Parser):
        FUNCTIONS = {
            **MySQL.Parser.FUNCTIONS,
            "COLLECT_SET": exp.ArrayUniqueAgg.from_arg_list,
            "DATE_TRUNC": parse_timestamp_trunc,
            "REGEXP": exp.RegexpLike.from_arg_list,
            "TO_DATE": exp.TsOrDsToDate.from_arg_list,
        }

    class Generator(MySQL.Generator):
        CAST_MAPPING = {}

        TYPE_MAPPING = {
            **MySQL.Generator.TYPE_MAPPING,
            exp.DataType.Type.TEXT: "STRING",
            exp.DataType.Type.TIMESTAMP: "DATETIME",
            exp.DataType.Type.TIMESTAMPTZ: "DATETIME",
        }

        LAST_DAY_SUPPORTS_DATE_PART = False

        TIMESTAMP_FUNC_TYPES = set()

        TRANSFORMS = {
            **MySQL.Generator.TRANSFORMS,
            exp.ApproxDistinct: approx_count_distinct_sql,
            exp.ArgMax: rename_func("MAX_BY"),
            exp.ArgMin: rename_func("MIN_BY"),
            exp.ArrayAgg: rename_func("COLLECT_LIST"),
            exp.ArrayUniqueAgg: rename_func("COLLECT_SET"),
            exp.CurrentTimestamp: lambda *_: "NOW()",
            exp.DateTrunc: lambda self, e: self.func(
                "DATE_TRUNC", e.this, "'" + e.text("unit") + "'"
            ),
            exp.JSONExtractScalar: arrow_json_extract_sql,
            exp.JSONExtract: arrow_json_extract_sql,
            exp.Map: rename_func("ARRAY_MAP"),
            exp.RegexpLike: rename_func("REGEXP"),
            exp.RegexpSplit: rename_func("SPLIT_BY_STRING"),
            exp.StrToUnix: lambda self, e: f"UNIX_TIMESTAMP({self.sql(e, 'this')}, {self.format_time(e)})",
            exp.Split: rename_func("SPLIT_BY_STRING"),
            exp.TimeStrToDate: rename_func("TO_DATE"),
            exp.ToChar: lambda self, e: f"DATE_FORMAT({self.sql(e, 'this')}, {self.format_time(e)})",
            exp.TsOrDsAdd: lambda self, e: f"DATE_ADD({self.sql(e, 'this')}, {self.sql(e, 'expression')})",  # Only for day level
            exp.TsOrDsToDate: lambda self, e: self.func("TO_DATE", e.this),
            exp.TimeToUnix: rename_func("UNIX_TIMESTAMP"),
            exp.TimestampTrunc: lambda self, e: self.func(
                "DATE_TRUNC", e.this, "'" + e.text("unit") + "'"
            ),
            exp.UnixToStr: lambda self, e: self.func(
                "FROM_UNIXTIME", e.this, time_format("doris")(self, e)
            ),
            exp.UnixToTime: rename_func("FROM_UNIXTIME"),
        }
