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use dprint_core::configuration::resolve_new_line_kind;
use dprint_core::formatting::*;
use dprint_core::types::ErrBox;

use super::configuration::Configuration;
use super::parsing::{file_has_ignore_file_directive, parse_cmark_ast, parse_node, parse_yaml_header, Context};

/// Formats a file.
///
/// Returns the file text or an error when it failed to parse.
pub fn format_text(
  file_text: &str,
  config: &Configuration,
  format_code_block_text: impl FnMut(&str, &str, u32) -> Result<String, ErrBox>,
) -> Result<String, ErrBox> {
  let (source_file, markdown_text) = match parse_source_file(file_text, config)? {
    ParseFileResult::IgnoreFile => return Ok(file_text.to_string()),
    ParseFileResult::SourceFile(file) => file,
  };

  Ok(dprint_core::formatting::format(
    || {
      let mut context = Context::new(&markdown_text, config, format_code_block_text);
      let print_items = parse_node(&source_file.into(), &mut context);
      // println!("{}", print_items.get_as_text());
      print_items
    },
    config_to_print_options(file_text, config),
  ))
}

#[cfg(feature = "tracing")]
pub fn trace_file(
  file_text: &str,
  config: &Configuration,
  format_code_block_text: Box<dyn Fn(&str, &str, u32) -> Result<String, String>>,
) -> dprint_core::formatting::TracingResult {
  let (source_file, markdown_text) = match parse_source_file(file_text, config).unwrap() {
    ParseFileResult::IgnoreFile => panic!("Cannot trace file because it has an ignore file comment."),
    ParseFileResult::SourceFile(file) => file,
  };
  dprint_core::formatting::trace_printing(
    || {
      let mut context = Context::new(&markdown_text, config, format_code_block_text);
      let print_items = parse_node(&source_file.into(), &mut context);
      // println!("{}", print_items.get_as_text());
      print_items
    },
    config_to_print_options(file_text, config),
  )
}

enum ParseFileResult<'a> {
  IgnoreFile,
  SourceFile((crate::parsing::common::SourceFile, &'a str)),
}

fn parse_source_file<'a>(file_text: &'a str, config: &Configuration) -> Result<ParseFileResult<'a>, String> {
  let yaml_header = parse_yaml_header(file_text); // todo: improve... this is kind of hacked into here
  let markdown_text = match &yaml_header {
    Some(yaml_header) => &file_text[yaml_header.range.end..],
    None => file_text,
  };

  // check for the presence of an dprint-ignore-file comment before parsing
  if file_has_ignore_file_directive(&markdown_text, &config.ignore_file_directive) {
    return Ok(ParseFileResult::IgnoreFile);
  }

  match parse_cmark_ast(markdown_text) {
    Ok(source_file) => {
      let mut source_file = source_file;
      source_file.yaml_header = yaml_header;
      Ok(ParseFileResult::SourceFile((source_file, markdown_text)))
    }
    Err(error) => Err(dprint_core::formatting::utils::string_utils::format_diagnostic(
      Some((error.range.start, error.range.end)),
      &error.message,
      file_text,
    )),
  }
}

fn config_to_print_options(file_text: &str, config: &Configuration) -> PrintOptions {
  PrintOptions {
    indent_width: 1, // force
    max_width: config.line_width,
    use_tabs: false, // ignore tabs, always use spaces
    new_line_text: resolve_new_line_kind(file_text, config.new_line_kind),
  }
}