"""
Integration tests for SCHISM namelist functionality.

This module tests the generation and validation of SCHISM namelists.
"""

import pytest
import yaml

# Since rompy_schism.nml doesn't exist, we'll create stub classes for testing
from pydantic import BaseModel, Field, model_validator


# Stub classes for testing
class SCHISMNamelist(BaseModel):
    """Stub class for SCHISM namelist."""

    start_date: str = Field(..., description="Start date for the model run")
    end_date: str = Field(..., description="End date for the model run")
    dt: int = Field(..., description="Time step in seconds")
    output_dt: int = Field(..., description="Output time step in seconds")
    ics: int = Field(0, description="Initial condition")
    nws: int = Field(0, description="Wind stress type")

    @model_validator(mode="after")
    def validate_dates_and_timesteps(self):
        """Validate that end_date is after start_date and dt is positive."""
        # Validate dt is positive
        if self.dt <= 0:
            raise ValueError("Time step (dt) must be positive")

        # Validate end_date is after start_date
        if self.start_date > self.end_date:
            raise ValueError("End date must be after start date")

        return self


class SCHISMNameListConfig(BaseModel):
    """Stub class for SCHISM namelist configuration."""

    config_values: SCHISMNamelist = Field(..., description="Model configuration")
    physical_params: dict = Field(
        default_factory=dict, description="Physical parameters"
    )
    numerical_params: dict = Field(
        default_factory=dict, description="Numerical parameters"
    )


pytest.importorskip("rompy_schism")


class TestNamelistGeneration:
    """Tests for namelist generation and processing."""

    def test_basic_namelist(self, grid2d, tmp_path):
        """Test basic namelist generation."""
        # Create a simple namelist configuration
        namelist = SCHISMNamelist(
            start_date="2020-01-01",
            end_date="2020-01-10",
            dt=150,  # 150 seconds
            output_dt=3600,  # 1 hour
        )

        # Validate essential fields
        assert namelist.start_date == "2020-01-01"
        assert namelist.end_date == "2020-01-10"
        assert namelist.dt == 150
        assert namelist.output_dt == 3600

        # Write the namelist to a file
        output_path = tmp_path / "param.nml"
        # Here we would use a method to write the namelist, if available
        # For now, we test a basic dump
        namelist_dict = namelist.model_dump()
        yaml.dump(namelist_dict, open(output_path, "w"))

        assert output_path.exists()

    def test_from_yaml_config(self, tmp_path):
        """Test loading a namelist from a YAML configuration file."""
        # Create a simple YAML config
        yaml_content = """
        start_date: '2020-01-01'
        end_date: '2020-01-10'
        dt: 150
        output_dt: 3600
        """

        config_path = tmp_path / "config.yaml"
        with open(config_path, "w") as f:
            f.write(yaml_content)

        # Load the configuration
        # This would use a method to load from YAML if available
        # For now, we test loading YAML directly
        config = yaml.safe_load(open(config_path))
        namelist = SCHISMNamelist(**config)

        # Validate loaded fields
        assert namelist.start_date == "2020-01-01"
        assert namelist.end_date == "2020-01-10"
        assert namelist.dt == 150
        assert namelist.output_dt == 3600

    def test_namelist_validation(self):
        """Test validation in namelist objects."""
        # Test with invalid values
        with pytest.raises(Exception):
            # Negative dt should be invalid
            SCHISMNamelist(
                start_date="2020-01-01",
                end_date="2020-01-10",
                dt=-1,
                output_dt=3600,
            )

        with pytest.raises(Exception):
            # End date before start date should be invalid
            SCHISMNamelist(
                start_date="2020-01-10",
                end_date="2020-01-01",
                dt=150,
                output_dt=3600,
            )

    def test_complex_namelist(self, tmp_path):
        """Test complex namelist with nested sections."""
        # Create a namelist with sections
        namelist = SCHISMNameListConfig(
            config_values=SCHISMNamelist(
                start_date="2020-01-01",
                end_date="2020-01-10",
                dt=150,
                output_dt=3600,
            ),
            physical_params={
                "bottom_friction": 0.0025,
                "density_method": 1,
            },
            numerical_params={
                "h_bcc_alpha": 0.5,
                "h_bcc_beta": 0.5,
            },
        )

        # Validate the structure
        assert hasattr(namelist, "config_values")
        assert namelist.config_values.dt == 150
        assert namelist.physical_params["bottom_friction"] == 0.0025
        assert namelist.numerical_params["h_bcc_alpha"] == 0.5

        # Write and validate the complex namelist
        output_path = tmp_path / "param_complex.yaml"
        yaml.dump(namelist.model_dump(), open(output_path, "w"))
        assert output_path.exists()


if __name__ == "__main__":
    pytest.main(["-v", __file__])
