mcat 0.3.5

use std::{fs::File, io::Write, path::PathBuf};

use ffmpeg_sidecar::command::FfmpegCommand;
use image::{GenericImage, ImageFormat};
use itertools::Itertools;
use markdownify::ConvertOptions;
use rasteroid::term_misc;
use rayon::iter::{IndexedParallelIterator, IntoParallelIterator, ParallelIterator};
use tempfile::{NamedTempFile, TempDir};

use crate::{catter, converter};

pub fn concat_text(paths: Vec<(&PathBuf, Option<String>)>) -> NamedTempFile {
    let mut chunks: Vec<(usize, String)> = paths
        .into_par_iter()
        .enumerate()
        .map(|(idx, (path, name))| {
            let screen_size = term_misc::get_wininfo();
            let mut opts = ConvertOptions::new(path.as_path())
                .with_screen_size((screen_size.sc_width, screen_size.sc_height));
            opts.name_header = name.as_ref().map(|v| v.as_str());
            let md = match markdownify::convert(opts) {
                Ok(md) => md,
                Err(err) => format!("**[Failed Reading: {}]**", err),
            };
            (idx, md)
        })
        .collect();

    chunks.sort_by_key(|&(idx, _)| idx);
    let markdown: String = chunks
        .into_iter()
        .map(|(_, md)| md)
        .collect::<Vec<_>>()
        .join("\n\n");

    let mut tmp_file = NamedTempFile::with_suffix(".md").expect("failed to create tmp file");
    tmp_file
        .write_all(markdown.trim().as_bytes())
        .expect("failed writing to tmp file");

    tmp_file
}

pub fn concat_images(
    image_paths: Vec<(PathBuf, Option<String>)>,
    horizontal: bool,
) -> Result<NamedTempFile, Box<dyn std::error::Error>> {
    let images: Vec<image::DynamicImage> = image_paths
        .into_par_iter()
        .enumerate()
        .filter_map(|(idx, (path, _))| {
            let img = if path.extension().is_some_and(|e| e == "svg") {
                File::open(&path)
                    .ok()
                    .and_then(|file| converter::svg_to_image(file, None, None).ok())
            } else {
                image::open(&path).ok()
            };

            img.map(|img| (idx, img))
        })
        .collect::<Vec<_>>()
        .into_iter()
        .sorted_by_key(|(idx, _)| *idx)
        .map(|(_, img)| img)
        .collect();

    // Calculate dimensions of the output image
    let (width, height) = if horizontal {
        // For horizontal concatenation, sum widths and take max height
        let total_width: u32 = images.iter().map(|img| img.width()).sum();
        let max_height: u32 = images.iter().map(|img| img.height()).max().unwrap_or(0);
        (total_width, max_height)
    } else {
        // For vertical concatenation, sum heights and take max width
        let max_width: u32 = images.iter().map(|img| img.width()).max().unwrap_or(0);
        let total_height: u32 = images.iter().map(|img| img.height()).sum();
        (max_width, total_height)
    };

    // Create a new image with the calculated dimensions
    let mut output = image::RgbaImage::new(width, height);

    // Place each image in the output
    let mut x_offset = 0;
    let mut y_offset = 0;

    for img in images {
        output.copy_from(&img, x_offset, y_offset)?;

        if horizontal {
            x_offset += img.width();
        } else {
            y_offset += img.height();
        }
    }

    // Create a temporary file with .png extension
    let temp_file = NamedTempFile::with_suffix(".png")?;
    output.save_with_format(temp_file.path(), image::ImageFormat::Png)?;
    Ok(temp_file)
}

pub fn concat_video(
    paths: &Vec<(PathBuf, Option<String>)>,
) -> Result<(TempDir, PathBuf), Box<dyn std::error::Error>> {
    let mut concat_list_file = NamedTempFile::new()?;

    for (path, _) in paths {
        let path_dis = path
            .canonicalize()?
            .to_string_lossy()
            .into_owned()
            .replace("\\\\?\\", "");
        writeln!(concat_list_file, "file '{}'", path_dis)?;
    }

    let first_path = &paths[0].0;
    let suffix = first_path
        .extension()
        .unwrap_or_default()
        .to_string_lossy()
        .into_owned();

    if !ffmpeg_sidecar::command::ffmpeg_is_installed() {
        eprintln!("ffmpeg isn't installed, installing.. it may take a little");
        ffmpeg_sidecar::download::auto_download()?;
    }

    let random_temp_dir = tempfile::tempdir()?;
    let output_path = random_temp_dir
        .path()
        .join(format!("concat_output.{}", suffix));
    let output_path_string = output_path.to_string_lossy().into_owned();

    let mut command = FfmpegCommand::new();
    command
        .hwaccel("auto")
        .format("concat")
        .arg("-safe")
        .arg("0")
        .input(concat_list_file.path().to_string_lossy())
        .arg("-c")
        .arg("copy")
        .output(&output_path_string);

    let mut child = command.spawn()?;

    let status = child.wait()?;
    if status.success() {
        Ok((random_temp_dir, output_path))
    } else {
        Err(format!(
            "FFmpeg failed with code {:?}, make sure the videos are the same format",
            status.code(),
        )
        .into())
    }
}

pub fn check_unified_format(paths: &[(PathBuf, Option<String>)]) -> &'static str {
    if paths.is_empty() {
        return "text"; // Default if no files
    }

    let mut detected_format: Option<&'static str> = None;

    for (path, _) in paths {
        if let Some(extension) = path.extension() {
            if let Some(ext_str) = extension.to_str() {
                let ext = ext_str.to_lowercase();

                let current_format = if catter::is_video(&ext) {
                    "video"
                } else if ImageFormat::from_extension(&ext).is_some() || ext == "svg" {
                    "image"
                } else {
                    "text"
                };

                if let Some(prev_format) = detected_format {
                    if prev_format != current_format {
                        // Found conflicting formats
                        eprintln!(
                            "Error: Cannot have 2 different formats [text / images / videos]"
                        );
                        std::process::exit(1);
                    }
                } else {
                    // First file, set the format
                    detected_format = Some(current_format);
                }
            }
        } else {
            // Files with no extension are considered text
            if detected_format.is_some() && detected_format.unwrap() != "text" {
                eprintln!("Error: Cannot have 2 different formats");
                std::process::exit(1);
            }
            detected_format = Some("text");
        }
    }
    detected_format.unwrap_or("text")
}

pub fn assign_names<'a>(
    paths: &'a [(PathBuf, Option<String>)],
) -> Vec<(&'a PathBuf, Option<String>)> {
    if paths.len() == 1 {
        return vec![(&paths[0].0, None)];
    }

    paths
        .iter()
        .map(|(path, name)| {
            if name.is_some() {
                (path, name.clone())
            } else {
                let path_str = path.to_string_lossy().to_string();
                (path, Some(path_str))
            }
        })
        .collect()
}