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use std::fmt;

use crate::{
    instruction::{
        format_instructions, write_expression_parameter_string, Expression, GateModifier,
        Instruction, Qubit,
    },
    validation::identifier::{validate_identifier, IdentifierValidationError},
};

use super::write_qubit_parameters;

#[derive(Clone, Debug, Default, PartialEq)]
pub struct Calibration {
    pub instructions: Vec<Instruction>,
    pub modifiers: Vec<GateModifier>,
    pub name: String,
    pub parameters: Vec<Expression>,
    pub qubits: Vec<Qubit>,
}

impl Calibration {
    /// Builds a new calibration definition.
    ///
    /// # Errors
    ///
    /// Returns an error if the given name isn't a valid Quil identifier.
    pub fn new(
        name: &str,
        parameters: Vec<Expression>,
        qubits: Vec<Qubit>,
        instructions: Vec<Instruction>,
        modifiers: Vec<GateModifier>,
    ) -> Result<Self, IdentifierValidationError> {
        validate_identifier(name)?;
        Ok(Self {
            instructions,
            modifiers,
            name: name.to_string(),
            parameters,
            qubits,
        })
    }
}

impl fmt::Display for Calibration {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "DEFCAL {}", self.name)?;
        write_expression_parameter_string(f, &self.parameters)?;
        write_qubit_parameters(f, &self.qubits)?;
        write!(f, ":")?;
        for instruction in &self.instructions {
            write!(f, "\n\t{instruction}")?;
        }
        Ok(())
    }
}

#[derive(Clone, Debug, PartialEq)]
pub struct MeasureCalibrationDefinition {
    pub qubit: Option<Qubit>,
    pub parameter: String,
    pub instructions: Vec<Instruction>,
}

#[cfg(test)]
mod test_measure_calibration_definition {
    use super::MeasureCalibrationDefinition;
    use crate::expression::Expression;
    use crate::instruction::{Gate, Instruction, Qubit};
    use insta::assert_snapshot;
    use rstest::rstest;

    #[rstest]
    #[case(
        "With Fixed Qubit",
        MeasureCalibrationDefinition {
            qubit: Some(Qubit::Fixed(0)),
            parameter: "theta".to_string(),
            instructions: vec![Instruction::Gate(Gate {
                name: "X".to_string(),
                parameters: vec![Expression::Variable("theta".to_string())],
                qubits: vec![Qubit::Fixed(0)],
                modifiers: vec![],

            })]},
    )]
    #[case(
        "With Variable Qubit",
        MeasureCalibrationDefinition {
            qubit: Some(Qubit::Variable("q".to_string())),
            parameter: "theta".to_string(),
            instructions: vec![Instruction::Gate(Gate {
                name: "X".to_string(),
                parameters: vec![Expression::Variable("theta".to_string())],
                qubits: vec![Qubit::Variable("q".to_string())],
                modifiers: vec![],
            })]},
    )]
    fn test_display(
        #[case] description: &str,
        #[case] measure_cal_def: MeasureCalibrationDefinition,
    ) {
        insta::with_settings!({
            snapshot_suffix => description,
        }, {
            assert_snapshot!(measure_cal_def.to_string())
        })
    }
}

impl MeasureCalibrationDefinition {
    pub fn new(qubit: Option<Qubit>, parameter: String, instructions: Vec<Instruction>) -> Self {
        Self {
            qubit,
            parameter,
            instructions,
        }
    }
}

impl fmt::Display for MeasureCalibrationDefinition {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "DEFCAL MEASURE")?;
        if let Some(qubit) = &self.qubit {
            write!(f, " {qubit}")?;
        }

        writeln!(
            f,
            " {}:\n\t{}",
            self.parameter,
            format_instructions(&self.instructions)
        )
    }
}