from typing import Tuple

from sqlalchemy import dialects, Table, text

from src.sandwich.dialects.base import DialectHandler


class PostgresDialectHandler(DialectHandler):
    """Dialect handler for PostgreSQL.

    NOTE: This is a stub implementation. All methods need to be implemented
    based on PostgreSQL syntax and conventions.
    """

    def get_boolean_type(self):
        return dialects.postgresql.BOOLEAN

    def get_proc_name_format(self, schema: str, operation: str, entity_name: str) -> str:
        """Get Postgres procedure naming format."""
        # Postgres uses lowercase with underscores by convention
        operation_lower = operation.lower()
        return f"{schema}.{operation_lower}_{entity_name}"

    def apply_proc_template(self, proc_name: str, sql_body: str, header: str) -> str:
        """Wrap SQL body in Postgres procedure template with error handling."""
        # TODO: Implement Postgres procedure template
        # Postgres uses CREATE OR REPLACE PROCEDURE/FUNCTION with PL/pgSQL
        # Error handling uses EXCEPTION blocks
        # Logging integration needed
        raise NotImplementedError("Postgres procedure template not yet implemented")

    def make_stg_materialization_proc(
        self,
        entity_name: str,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres staging materialization procedure."""
        # TODO: Implement using CREATE OR REPLACE and DROP/CREATE TABLE pattern
        raise NotImplementedError("Postgres staging materialization not yet implemented")

    def make_hub_proc(
        self,
        hub_table: Table,
        bk_keys: list,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres hub population procedure."""
        # TODO: Implement using INSERT...ON CONFLICT or NOT EXISTS pattern
        raise NotImplementedError("Postgres hub procedure not yet implemented")

    def make_sdc2_sat_proc(
        self,
        sat_table: Table,
        hk_name: str,
        hashdiff_col: str,
        is_available_col: str,
        loaddate_col: str,
        stg_schema: str,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres satellite population procedure."""
        # TODO: Implement using CTE and window functions (similar to MSSQL but with Postgres syntax)
        # Use CURRENT_TIMESTAMP instead of SYSDATETIME()
        # Use BOOLEAN type instead of BIT
        raise NotImplementedError("Postgres satellite procedure not yet implemented")

    def make_scd2_dim_proc(
        self,
        dim_table: Table,
        bk_keys: list,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres dimension SCD2 recalculation procedure."""
        # TODO: Implement using TRUNCATE and INSERT with window functions
        # Use LAG/LEAD for SCD2 date calculations
        # Use INTERVAL for date arithmetic instead of DATEADD
        raise NotImplementedError("Postgres dimension procedure not yet implemented")

    def make_job_proc(
        self,
        entity_name: str,
        hub_proc_name: str,
        sat_proc_name: str,
        dim_proc_name: str,
        stg_proc_name: str | None,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres job orchestration procedure."""
        # TODO: Implement using CALL statements for other procedures
        # Pass execution_id through procedure parameters
        raise NotImplementedError("Postgres job procedure not yet implemented")

    def make_drop_proc(
        self,
        entity_name: str,
        stg_schema: str,
        job_proc_name: str,
        stg_proc_name: str | None,
        hub_proc_name: str,
        sat_proc_name: str,
        dim_proc_name: str,
        header: str
    ) -> Tuple[str, str]:
        """Generate Postgres cleanup/drop procedure."""
        # TODO: Implement using DROP IF EXISTS for tables and procedures
        # Update core.entities with deletion timestamp
        raise NotImplementedError("Postgres drop procedure not yet implemented")
