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use ffi::{self, DialogFlags, DialogType};
use std::{ffi::CString, path::PathBuf};
use {read_str, WVResult, WebView};

const STR_BUF_SIZE: usize = 4096;

/// A builder for opening a new dialog window.
#[derive(Debug)]
pub struct DialogBuilder<'a: 'b, 'b, T: 'a> {
    webview: &'b mut WebView<'a, T>,
}

impl<'a: 'b, 'b, T: 'a> DialogBuilder<'a, 'b, T> {
    /// Creates a new dialog builder for a WebView.
    pub fn new(webview: &'b mut WebView<'a, T>) -> DialogBuilder<'a, 'b, T> {
        DialogBuilder { webview }
    }

    fn dialog(
        &mut self,
        title: String,
        arg: String,
        dialog_type: DialogType,
        dialog_flags: DialogFlags,
    ) -> WVResult<String> {
        let mut s = [0u8; STR_BUF_SIZE];

        let title_cstr = CString::new(title)?;
        let arg_cstr = CString::new(arg)?;

        unsafe {
            ffi::webview_dialog(
                self.webview.inner,
                dialog_type,
                dialog_flags,
                title_cstr.as_ptr(),
                arg_cstr.as_ptr(),
                s.as_mut_ptr() as _,
                s.len(),
            );
        }

        Ok(read_str(&s))
    }

    /// Opens a new open file dialog and returns the chosen file path.
    pub fn open_file<S, P>(&mut self, title: S, default_file: P) -> WVResult<Option<PathBuf>>
    where
        S: Into<String>,
        P: Into<PathBuf>,
    {
        self.dialog(
            title.into(),
            default_file.into().to_string_lossy().into_owned(),
            DialogType::Open,
            DialogFlags::FILE,
        )
        .map(|path| {
            if path.is_empty() {
                None
            } else {
                Some(PathBuf::from(path))
            }
        })
    }

    /// Opens a new choose directory dialog as returns the chosen directory path.
    pub fn choose_directory<S, P>(
        &mut self,
        title: S,
        default_directory: P,
    ) -> WVResult<Option<PathBuf>>
    where
        S: Into<String>,
        P: Into<PathBuf>,
    {
        self.dialog(
            title.into(),
            default_directory.into().to_string_lossy().into_owned(),
            DialogType::Open,
            DialogFlags::DIRECTORY,
        )
        .map(|path| {
            if path.is_empty() {
                None
            } else {
                Some(PathBuf::from(path))
            }
        })
    }

    /// Opens an info alert dialog.
    pub fn info<TS, MS>(&mut self, title: TS, message: MS) -> WVResult
    where
        TS: Into<String>,
        MS: Into<String>,
    {
        self.dialog(
            title.into(),
            message.into(),
            DialogType::Alert,
            DialogFlags::INFO,
        )
        .map(|_| ())
    }

    /// Opens a warning alert dialog.
    pub fn warning<TS, MS>(&mut self, title: TS, message: MS) -> WVResult
    where
        TS: Into<String>,
        MS: Into<String>,
    {
        self.dialog(
            title.into(),
            message.into(),
            DialogType::Alert,
            DialogFlags::WARNING,
        )
        .map(|_| ())
    }

    /// Opens an error alert dialog.
    pub fn error<TS, MS>(&mut self, title: TS, message: MS) -> WVResult
    where
        TS: Into<String>,
        MS: Into<String>,
    {
        self.dialog(
            title.into(),
            message.into(),
            DialogType::Alert,
            DialogFlags::ERROR,
        )
        .map(|_| ())
    }
}