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// usage calls


// TODO: Move struct and type definitions to own file/module
// Type definitions

pub mod types {

    use std::fmt;
    /// List of classes in planner
    pub struct ClassList(pub Vec<Class>);

    // Let us print out Tasklist nicely
    impl fmt::Display for ClassList {

        /*
         * This implementation of fmt is cool because we are chaning the child types fmt:Display
         * implementation through our iterator, meaning we only have to change the root Display once
         * and it will automatically change it up here.
         */
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            // Iterate through list
            for class in &self.0 {
                // Write to formater using class implementation of fmt()
                writeln!(f, "{}", class)?;
            }

            // Return okay
            Ok(())
        }

    }

    /// List of tasks in Class
    // This has to be a struct to implement Display
    pub struct TaskList(pub Vec<Task>);

    // Let us print out Tasklist nicely
    impl fmt::Display for TaskList {

        /*
         * This implementation of fmt is cool because we are chaning the child types fmt:Display
         * implementation through our iterator, meaning we only have to change the root Display once
         * and it will automatically change it up here.
         */
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            // Iterate through list
            for task in &self.0 {
                // Write to formater using task implementation of fmt()
                writeln!(f, "{}", task)?;
            }

            // Return okay
            Ok(())
        }

    }

    // Struct definitions

    /// Main planner structure, contains class list and subtypes
    pub struct Planner {
        /// Name of planner (i.e. "School")
        pub name: String,
        /// default Calendar for writing
        pub calendar: String,
        /// List of classes for a planner
        pub class_list: ClassList
    }

    impl fmt::Display for Planner {
        // Printable classes
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            write!(f, "Planner: {}\nCalendar: {}\nClasses:\n{}", self.name, self.calendar, self.class_list)
        }
    }

    /// Class structure, contains list of assignemnts
    pub struct Class {
        /// Name of class (i.e "La", "Math", etc.)
        pub name: String,
        /// List of task in class, can be HW or inclass work,
        pub tasks: TaskList,
    }

    impl fmt::Display for Class {
        // Printable classes
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            write!(f, "Class: {}\nAssignments:\n{}", self.name, self.tasks)
        }
    }

    /// Task structure, a given assigment for a Class
    pub struct Task {
        /// Name of task
        pub name: String,
        /// Due date of task (i.e. "1/3/2019 8:45 AM")
    pub due_date: usize,
    /// Priority of task
    pub priority: usize,
    /// Extra information on task
    pub notes: String
}

// Implement Display for Task (fancy printing)
impl fmt::Display for Task {
    // Implement Display so we can use println! macros
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // Write out our task to the formatter
        write!(f, "{} | Due: {} | Priority: {}", self.name, self.due_date, self.priority)
    }
}


}

pub mod prelude {
    pub use crate::types::*;
}