pub struct Strategy {}

use std::path::PathBuf;
use std::fs::{copy, create_dir_all};

use crate::file_handler::{File, FileType, FileHandlerStrategy};

impl Strategy {
    fn handle(&self, source: &PathBuf, destination: &PathBuf, file: &File) {
        let relative_path = file.path.strip_prefix(&source).unwrap();
        let complete_destination = destination.join(relative_path);
        let destination_parent = complete_destination.parent().unwrap();
        create_dir_all(destination_parent).unwrap();
        copy(&file.path, &complete_destination).unwrap();
    }
}

impl FileHandlerStrategy for Strategy {
    fn is(&self, path: &PathBuf) -> bool {
        !path.is_dir()
    }

    fn identify(&self) -> FileType {
        FileType::File
    }

    fn can_handle(&self, file_type: &FileType) -> bool {
        match file_type {
            FileType::File => true,
            _ => false,
        }
    }

    fn handle_html(&self, source: &PathBuf, destination: &PathBuf, file: &File, _l: &str) {
        return self.handle(source, destination, file);
    }

    fn handle_gemini(&self, source: &PathBuf, destination: &PathBuf, file: &File) {
        return self.handle(source, destination, file);
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs;

    fn setup() -> Strategy {
        Strategy {}
    }

    fn fixtures_dir() -> PathBuf {
        PathBuf::from("tests/fixtures")
    }

    fn fixture_path(filename: &str) -> PathBuf {
        fixtures_dir().join(filename)
    }

    mod file_type_tests {
        use super::*;

        #[test]
        fn identifies_regular_files() {
            let strategy = setup();
            assert!(strategy.is(&fixture_path("image.png")));
            assert!(strategy.is(&fixture_path("style.css")));
            assert!(!strategy.is(&fixtures_dir()));
        }

        #[test]
        fn identifies_file_type() {
            let strategy = setup();
            assert!(matches!(strategy.identify(), FileType::File));
        }

        #[test]
        fn handles_correct_file_type() {
            let strategy = setup();
            assert!(strategy.can_handle(&FileType::File));
            assert!(!strategy.can_handle(&FileType::Layout));
            assert!(!strategy.can_handle(&FileType::Gemini));
            assert!(!strategy.can_handle(&FileType::Unknown));
        }
    }

    mod file_handling_tests {
        use super::*;

        #[test]
        fn copies_single_file() {
            let strategy = setup();
            let source = fixtures_dir();
            let output = fixture_path("output");

            let file = File {
                path: fixture_path("image.png"),
                file_type: FileType::File,
            };

            strategy.handle(&source, &output, &file);

            let copied_path = output.join("image.png");
            assert!(copied_path.exists());

            // Verify file contents are identical
            let original = fs::read(&file.path).unwrap();
            let copied = fs::read(&copied_path).unwrap();
            assert_eq!(original, copied);

            // Cleanup
            let _ = fs::remove_file(copied_path);
        }

        #[test]
        fn copies_nested_file() {
            let strategy = setup();
            let source = fixtures_dir();
            let output = fixture_path("output");

            let file = File {
                path: fixture_path("assets/style.css"),
                file_type: FileType::File,
            };

            strategy.handle(&source, &output, &file);

            let copied_path = output.join("assets").join("style.css");
            assert!(copied_path.exists());

            // Verify file contents are identical
            let original = fs::read(&file.path).unwrap();
            let copied = fs::read(&copied_path).unwrap();
            assert_eq!(original, copied);

            // Cleanup
            let _ = fs::remove_file(copied_path);
            let _ = fs::remove_dir(output.join("assets"));
        }

        #[test]
        fn handle_html_copies_file() {
            let strategy = setup();
            let source = fixtures_dir();
            let output = fixture_path("output_html");

            let file = File {
                path: fixture_path("image.png"),
                file_type: FileType::File,
            };

            strategy.handle_html(&source, &output, &file, "unused layout");

            let copied_path = output.join("image.png");
            assert!(copied_path.exists());

            // Cleanup
            let _ = fs::remove_file(copied_path);
        }

        #[test]
        fn handle_gemini_copies_file() {
            let strategy = setup();
            let source = fixtures_dir();
            let output = fixture_path("output_gemini");

            let file = File {
                path: fixture_path("image.png"),
                file_type: FileType::File,
            };

            strategy.handle_gemini(&source, &output, &file);

            let copied_path = output.join("image.png");
            assert!(copied_path.exists());

            // Cleanup
            let _ = fs::remove_file(copied_path);
        }
    }
}