use wasm_bindgen::closure::Closure;
use web_sys::FileReader;
use wasm_bindgen::JsCast;
use yew::services::ConsoleService;
use crate::viewmodel::utility::File;
use yew::prelude::*;
use crate::view::VCardPropertyInputComponent;

pub mod vcard;
pub mod utility;
pub mod address;
pub mod name;
pub mod telephone;
pub mod dates;
pub mod organizational;


/// Trait for types that represent the data of a vcard property used inside of a `VCardPropertyInputComponent`.
pub trait VCardPropertyInputObject<C: VCardPropertyInputComponent<Self>>: Clone + PartialEq
    where Self: Sized 
{
    /// Function for creating a new (and empty) `VCardPropertyInputObject`.
    fn new() -> Self;
    /// Converts each field of the `VCardPropertyInputObject` to a VCardPropertyInputField and returns them as a vector.
    fn get_input_fields(&self, link: &ComponentLink<C>) -> Vec<VCardPropertyInputField>;
    /// Returns a `Html` representation of the `VCardPropertyInputObject`.
    fn render(&self, link: &ComponentLink<C>) -> Html {
        html!{
            <div class="columns is-mobile is-multiline">
                { 
                    for self.get_input_fields(link).iter().map(|field|
                        field.render()
                    ) 
                }
            </div>
        }
    }
    /// Convenience function for checking if the `VCardPropertyInputObject` is empty.
    fn is_empty(&self) -> bool;
}

/// Type for saving error messages.
/// 
/// More of a placeholder for something better later on.
#[derive(Debug,Clone,PartialEq)]
pub struct Error {
    pub msg: String,
}

/// Type that represents the visiual appearance of an input field.
pub enum VCardPropertyInputField {
    Text {
        label: String,
        id: Option<String>,
        placeholder: Option<String>,
        oninput: Callback<InputData>,
        value: String,
        typ: String,
    },
    File {
        label: String,
        name: String,
        callback: Callback<Option<File>>,
        value: Option<File>,
    },
    CheckBox {
        label: String,
        id: Option<String>,
        onclick: Callback<MouseEvent>,
        value: bool,
    },
}

impl VCardPropertyInputField {
    /// Returns a `Html` representation of the `VCardPropertyInputField`.
    pub fn render(&self) -> Html {
        match self {
            Self::Text {
                label,
                id,
                placeholder,
                oninput,
                value: _,
                typ,
            } => Self::text_field_input(label, id, placeholder, oninput, typ),
            Self::File {
                label,
                name,
                callback,
                value,
            } => Self::file_field_input(label, name, callback, value),
            Self::CheckBox {
                label,
                id,
                onclick,
                value,
            } => Self::checkbox_field_input(label, id, value, onclick),
        }
    }
    /// Returns an `Html` representation of a text input field with the given parameters. 
    fn text_field_input(label: &str, id: &Option<String>, placeholder: &Option<String>, oninput: &Callback<InputData>, typ: &str) -> Html {
        html!{
            <div class="field column 
                        is-one-fifth-widescreen
                        is-one-quarter-desktop
                        is-one-third-tablet
                        is-half-mobile" >
                <label class="label">{ label }</label>
                <div class="control">
                    <input  id=id.as_ref().unwrap_or(&"".to_string())
                            type=typ
                            placeholder=placeholder.as_ref().unwrap_or(&"".to_string())
                            oninput=oninput
                    />
                </div>
            </div>
        }
    }
    /// Returns an `Html` representation of a file input field with the given parameters. 
    fn file_field_input(label: &str, name: &str, callback: &Callback<Option<File>>, file: &Option<File>) -> Html {
        let callback = callback.clone();
        let onchange = Callback::<()>::default();
        let onchange = onchange.reform(move |c: ChangeData|
            if let ChangeData::Files(files) = c {
                match files.item(0) {
                    Some(file) => { 
                        let file_reader = FileReader::new().unwrap();
                        match file_reader.read_as_data_url(&file) {
                            Ok(_) => (),
                            Err(_) => ConsoleService::warn("Error: Couldn't get file as data url."),
                        };

                        let callback = callback.clone();
                        let onload = Closure::wrap(Box::new(move |event: Event|{
                            let file_reader: FileReader = event.target().unwrap().dyn_into().unwrap();
                            let data_url: Option<String> = file_reader.result().unwrap().as_string();
                            match data_url {
                                Some(content) => callback.emit(
                                    Some(File {
                                        name: file.name(),
                                        content,
                                    })
                                ),
                                None => {
                                    ConsoleService::warn("Couldn't get data url as string.");
                                    callback.emit(None);
                                },
                            };
                        }) as Box<dyn FnMut(_)>);

                        file_reader.set_onload(Some(onload.as_ref().unchecked_ref()));
                        onload.forget();
                    },
                    None => callback.emit(None),
                }
            } else {
                callback.emit(None);
            }
        );
        html!{
            <div class="field column
                        is-one-fifth-widescreen
                        is-one-quarter-desktop
                        is-one-third-tablet
                        is-half-mobile" >
                <label class="label">{ label }</label>
                <div class="file has-name control">
                    <label class="file-label">
                        <input  class="file-input"
                                type="file"
                                name=name
                                onchange=onchange
                        />
                        <span class="file-cta">
                        <span class="file-icon">
                            <i class="fas fa-upload"></i>
                        </span>
                        <span class="file-label">
                            { "Choose file..." }
                        </span>
                        </span>
                        <span class="file-name">
                            {
                                match file {
                                    Some(file) => file.name.clone(),
                                    None => String::from("No file selected"),
                                }
                            }
                        </span>
                    </label>
                </div>
            </div>
        }
    }
    /// Returns an `Html` representation of a checkbox input field with the given parameters. 
    fn checkbox_field_input(label: &str, id: &Option<String>, checked: &bool, onclick: &Callback<MouseEvent>) -> Html {
        html!{
            <div class="field column 
                        is-one-fifth-widescreen 
                        is-one-quarter-desktop 
                        is-one-third-tablet 
                        is-half-mobile" >
                <label class="checkbox">
                    <input  id=id.as_ref().unwrap_or(&"".to_string())
                            type="checkbox" 
                            checked=*checked
                            onclick=onclick
                    />
                    { label }
                </label>
            </div>
        }
    }
}