use std::path::Path;

use crate::compare::diff::compare_document;
use crate::compare::parse::emacs_parse_anonymous_org_document;
use crate::compare::parse::emacs_parse_file_org_document;
use crate::compare::parse::get_emacs_version;
use crate::compare::parse::get_org_mode_version;
use crate::compare::sexp::sexp;
use crate::parser::parse_with_settings;
use crate::GlobalSettings;
use crate::LocalFileAccessInterface;

pub fn run_anonymous_compare<P: AsRef<str>>(
    org_contents: P,
) -> Result<(), Box<dyn std::error::Error>> {
    run_anonymous_compare_with_settings(org_contents, &GlobalSettings::default())
}

pub fn run_compare_on_file<P: AsRef<Path>>(org_path: P) -> Result<(), Box<dyn std::error::Error>> {
    let org_path = org_path.as_ref();
    eprintln!("Using emacs version: {}", get_emacs_version()?.trim());
    eprintln!("Using org-mode version: {}", get_org_mode_version()?.trim());
    let parent_directory = org_path
        .parent()
        .ok_or("Should be contained inside a directory.")?;
    let org_contents = std::fs::read_to_string(org_path)?;
    // TODO: This is a work-around to pretend that dos line endings do not exist. It would be better to handle the difference in line endings.
    let org_contents = org_contents.replace("\r\n", "\n");
    let org_contents = org_contents.as_str();
    let file_access_interface = LocalFileAccessInterface {
        working_directory: Some(parent_directory.to_path_buf()),
    };
    let global_settings = {
        let mut global_settings = GlobalSettings::default();
        global_settings.file_access = &file_access_interface;
        global_settings
    };
    let rust_parsed = parse_with_settings(org_contents, &global_settings)?;
    let org_sexp = emacs_parse_file_org_document(org_path)?;
    let (_remaining, parsed_sexp) = sexp(org_sexp.as_str()).map_err(|e| e.to_string())?;

    println!("{}\n\n\n", org_contents);
    println!("{}", org_sexp);
    println!("{:#?}", rust_parsed);

    // We do the diffing after printing out both parsed forms in case the diffing panics
    let diff_result = compare_document(&parsed_sexp, &rust_parsed)?;
    diff_result.print(org_contents)?;

    if diff_result.is_bad() {
        Err("Diff results do not match.")?;
    }

    Ok(())
}

pub fn run_anonymous_compare_with_settings<P: AsRef<str>>(
    org_contents: P,
    global_settings: &GlobalSettings,
) -> Result<(), Box<dyn std::error::Error>> {
    // TODO: This is a work-around to pretend that dos line endings do not exist. It would be better to handle the difference in line endings.
    let org_contents = org_contents.as_ref().replace("\r\n", "\n");
    let org_contents = org_contents.as_str();
    eprintln!("Using emacs version: {}", get_emacs_version()?.trim());
    eprintln!("Using org-mode version: {}", get_org_mode_version()?.trim());
    let rust_parsed = parse_with_settings(org_contents, global_settings)?;
    let org_sexp = emacs_parse_anonymous_org_document(org_contents, global_settings)?;
    let (_remaining, parsed_sexp) = sexp(org_sexp.as_str()).map_err(|e| e.to_string())?;

    println!("{}\n\n\n", org_contents);
    println!("{}", org_sexp);
    println!("{:#?}", rust_parsed);

    // We do the diffing after printing out both parsed forms in case the diffing panics
    let diff_result = compare_document(&parsed_sexp, &rust_parsed)?;
    diff_result.print(org_contents)?;

    if diff_result.is_bad() {
        Err("Diff results do not match.")?;
    }

    Ok(())
}