use crate::declare_detector;
use crate::diagnostic::{Action, Deb822Action, Diagnostic, ParagraphSelector};
use crate::{Certainty, FixerError, FixerPreferences, LintianIssue, Visibility};
use debian_workspace::Workspace;
use std::path::PathBuf;

const DESCRIPTION: &str = "Replace XC-Package-Type with Package-Type.";
const LABEL: &str = "Replace XC-Package-Type with Package-Type.";

pub fn detect(
    ws: &dyn Workspace,
    _preferences: &FixerPreferences,
) -> Result<Vec<Diagnostic>, FixerError> {
    let control = match ws.parsed_control() {
        Ok(c) => c,
        Err(debian_workspace::Error::NotFound) => return Ok(Vec::new()),
        Err(e) => return Err(e.into()),
    };
    let mut diagnostics = Vec::new();

    if let Some(source) = control.source() {
        let paragraph = source.as_deb822();
        if let Some(entry) = paragraph.get_entry("XC-Package-Type") {
            let line_number = entry.line() + 1;
            let issue = LintianIssue::source_with_info(
                "adopted-extended-field",
                Visibility::Info,
                vec![format!(
                    "(in section for source) XC-Package-Type [debian/control:{}]",
                    line_number
                )],
            );
            diagnostics.push(
                Diagnostic::with_actions(
                    issue,
                    DESCRIPTION,
                    LABEL,
                    vec![Action::Deb822(Deb822Action::RenameField {
                        file: PathBuf::from("debian/control"),
                        paragraph: ParagraphSelector::Source,
                        from: "XC-Package-Type".into(),
                        to: "Package-Type".into(),
                    })],
                )
                .with_certainty(Certainty::Certain),
            );
        }
    }

    for binary in control.binaries() {
        let Some(package_name) = binary.name() else {
            continue;
        };
        let paragraph = binary.as_deb822();
        let Some(entry) = paragraph.get_entry("XC-Package-Type") else {
            continue;
        };
        let line_number = entry.line() + 1;
        let issue = LintianIssue::binary_with_info(
            &package_name,
            "adopted-extended-field",
            Visibility::Info,
            vec![format!(
                "(in section for {}) XC-Package-Type [debian/control:{}]",
                package_name, line_number
            )],
        );
        diagnostics.push(
            Diagnostic::with_actions(
                issue,
                DESCRIPTION,
                LABEL,
                vec![Action::Deb822(Deb822Action::RenameField {
                    file: PathBuf::from("debian/control"),
                    paragraph: ParagraphSelector::Binary {
                        package: package_name,
                    },
                    from: "XC-Package-Type".into(),
                    to: "Package-Type".into(),
                })],
            )
            .with_certainty(Certainty::Certain),
        );
    }

    Ok(diagnostics)
}

declare_detector! {
    name: "xc-package-type-in-debian-control",
    tags: ["adopted-extended-field"],
    triggers: [
        debian_workspace::Trigger::Deb822Field {
            file: "debian/control",
            paragraph_key: "Source",
            field: "XC-Package-Type",
        },
        debian_workspace::Trigger::Deb822Field {
            file: "debian/control",
            paragraph_key: "Package",
            field: "XC-Package-Type",
        },
    ],
    detect: |ws, prefs| detect(ws, prefs),
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::detector::Detector;
    use crate::{FixerPreferences, Version};
    use std::fs;
    use std::path::Path;
    use tempfile::TempDir;

    fn run_apply(base: &Path) -> Result<crate::FixerResult, FixerError> {
        let version: Version = "1.0".parse().unwrap();
        let adapter = DetectorImpl;
        {
            let ws = debian_workspace::fs_workspace::FsWorkspace::new(
                base,
                Some("test".into()),
                Some(version.clone()),
            );
            adapter.apply(&ws, &FixerPreferences::default())
        }
    }

    #[test]
    fn test_xc_package_type_in_source() {
        let temp_dir = TempDir::new().unwrap();
        let base_path = temp_dir.path();
        let debian_dir = base_path.join("debian");
        fs::create_dir(&debian_dir).unwrap();

        let control_path = debian_dir.join("control");
        fs::write(&control_path, "Source: test\nXC-Package-Type: deb\n\nPackage: test\nDescription: Test\n Test package\n").unwrap();

        let result = run_apply(base_path).unwrap();
        assert_eq!(result.description, DESCRIPTION);
        assert_eq!(result.certainty, Some(Certainty::Certain));

        assert_eq!(
            fs::read_to_string(&control_path).unwrap(),
            "Source: test\nPackage-Type: deb\n\nPackage: test\nDescription: Test\n Test package\n",
        );
    }

    #[test]
    fn test_xc_package_type_in_binary() {
        let temp_dir = TempDir::new().unwrap();
        let base_path = temp_dir.path();
        let debian_dir = base_path.join("debian");
        fs::create_dir(&debian_dir).unwrap();

        let control_path = debian_dir.join("control");
        fs::write(&control_path, "Source: test\n\nPackage: test\nXC-Package-Type: udeb\nDescription: Test\n Test package\n").unwrap();

        let result = run_apply(base_path).unwrap();
        assert_eq!(result.certainty, Some(Certainty::Certain));

        assert_eq!(
            fs::read_to_string(&control_path).unwrap(),
            "Source: test\n\nPackage: test\nPackage-Type: udeb\nDescription: Test\n Test package\n",
        );
    }

    #[test]
    fn test_no_xc_package_type() {
        let temp_dir = TempDir::new().unwrap();
        let base_path = temp_dir.path();
        let debian_dir = base_path.join("debian");
        fs::create_dir(&debian_dir).unwrap();

        let control_path = debian_dir.join("control");
        let original =
            "Source: test\nPackage-Type: deb\n\nPackage: test\nDescription: Test\n Test package\n";
        fs::write(&control_path, original).unwrap();

        assert!(matches!(run_apply(base_path), Err(FixerError::NoChanges)));
        assert_eq!(fs::read_to_string(&control_path).unwrap(), original);
    }

    #[test]
    fn test_multiple_binaries() {
        let temp_dir = TempDir::new().unwrap();
        let base_path = temp_dir.path();
        let debian_dir = base_path.join("debian");
        fs::create_dir(&debian_dir).unwrap();

        let control_path = debian_dir.join("control");
        fs::write(&control_path, "Source: test\n\nPackage: test1\nXC-Package-Type: deb\nDescription: Test 1\n Test package 1\n\nPackage: test2\nXC-Package-Type: udeb\nDescription: Test 2\n Test package 2\n").unwrap();

        let result = run_apply(base_path).unwrap();
        assert_eq!(result.certainty, Some(Certainty::Certain));
        assert_eq!(result.fixed_lintian_issues.len(), 2);

        assert_eq!(
            fs::read_to_string(&control_path).unwrap(),
            "Source: test\n\nPackage: test1\nPackage-Type: deb\nDescription: Test 1\n Test package 1\n\nPackage: test2\nPackage-Type: udeb\nDescription: Test 2\n Test package 2\n",
        );
    }

    #[test]
    fn test_no_control_file() {
        let temp_dir = TempDir::new().unwrap();
        assert!(matches!(
            run_apply(temp_dir.path()),
            Err(FixerError::NoChanges)
        ));
    }
}
