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//! Charge
//! ===========
//! This file contains all the structs and definitions needed to
//! create charges usingt the Paystack API.

use crate::{error, Channel, Currency, PaystackResult};
use serde::Serialize;

/// This struct is used to create a charge body for creating a Charge Authorization using the Paystack API.
///
/// IMPORTANT: This class can only be created using the ChargeBuilder.
///
/// The struct has the following fields:
///     - amount: Amount should be in the smallest unit of the currency e.g. kobo if in NGN and cents if in USD
///     - email: Customer's email address
///     - currency (Optional): Currency in which amount should be charged (NGN, GHS, ZAR or USD). Defaults to your integration currency.
///       An enum is used for type safety.
///     - authorizatuin_code: A valid authorization code to charge
///     - reference (Optional): Unique transaction reference. Only -, ., = and alphanumeric characters allowed.
///     - channel (Optional): Send us 'card' or 'bank' or 'card','bank' as an array to specify what options to show the user paying.
///       An enum is used to implement this for type safety
///     - transaction_charge (Optional): A flat fee to charge the subaccount for this transaction
///     (in kobo if currency is NGN, pesewas, if currency is GHS, and cents, if currency is ZAR).
///     This overrides the split percentage set when the subaccount was created.
///     Ideally, you will need to use this if you are splitting in flat rates
///     (since subaccount creation only allows for percentage split). e.g. 7000 for a 70 naira

#[derive(Serialize, Debug)]
pub struct Charge {
    email: String,
    amount: String,
    authorization_code: String,
    reference: Option<String>,
    currency: Option<Currency>,
    channel: Option<Vec<Channel>>,
    transaction_charge: Option<u32>,
}

/// The `ChargeBuilder` struct provides a convenient way to construct a charge object
/// with optional fields. Each field can be set individually using the builder's methods.
/// Once all the desired fields are set, the `build` method can be called to create
/// an instance of the `Charge` struct.
///
/// # Errors
///
/// Returns a `PaystackResult` with an `Err` variant if any required fields are missing,
/// including email, amount, and authorization code. The error indicates which field is missing.
///
/// # Examples
///
/// ```rust
/// use paystack::{Currency, Channel, ChargeBuilder};
///
/// let charge = ChargeBuilder::new()
///         .email("user@example.com")
///         .amount("10000")
///         .authorization_code("AUTH_CODE")
///         .currency(Currency::USD)
///         .channel(vec![Channel::Card, Channel::Bank])
///         .build();
/// ```
#[derive(Default, Clone)]
pub struct ChargeBuilder {
    email: Option<String>,
    amount: Option<String>,
    authorization_code: Option<String>,
    reference: Option<String>,
    currency: Option<Currency>,
    channel: Option<Vec<Channel>>,
    transaction_charge: Option<u32>,
}

impl ChargeBuilder {
    /// Create a new instance of the Transaction builder with default properties
    pub fn new() -> Self {
        ChargeBuilder::default()
    }

    /// Specify the transaction email
    pub fn email(mut self, email: impl Into<String>) -> Self {
        self.email = Some(email.into());
        self
    }

    /// Specify the Transaction amount
    pub fn amount(mut self, amount: impl Into<String>) -> Self {
        self.amount = Some(amount.into());
        self
    }

    /// Specify the charge Authorization Code
    pub fn authorization_code(mut self, code: impl Into<String>) -> Self {
        self.authorization_code = Some(code.into());
        self
    }

    /// Specify charge reference
    pub fn reference(mut self, reference: impl Into<String>) -> Self {
        self.reference = Some(reference.into());
        self
    }

    /// Specify charge currency
    pub fn currency(mut self, currency: Currency) -> Self {
        self.currency = Some(currency);
        self
    }

    /// Specify charge channel
    pub fn channel(mut self, channel: Vec<Channel>) -> Self {
        self.channel = Some(channel);
        self
    }

    /// Specify charge transaction charge
    pub fn transaction_charge(mut self, transaction_charge: u32) -> Self {
        self.transaction_charge = Some(transaction_charge);
        self
    }

    /// Build the Charge object
    pub fn build(self) -> PaystackResult<Charge> {
        let Some(email) = self.email else {
            return Err(error::PaystackError::Charge("email is required for creating a charge".to_string()))
        };

        let Some(amount) = self.amount else {
            return Err(error::PaystackError::Charge(
                "amount is required for creating charge".to_string()
            ))
        };

        let Some(authorization_code) = self.authorization_code else {
            return Err(error::PaystackError::Charge(
                "authorization code is required for creating a charge".to_string()
            ))
        };

        Ok(Charge {
            email,
            amount,
            authorization_code,
            reference: self.reference,
            currency: self.currency,
            channel: self.channel,
            transaction_charge: self.transaction_charge,
        })
    }
}