#![allow(clippy::needless_update)]

use crate::*;
use core::fmt::{self, Display, Formatter};

/// Returns an extension license based on the provided id.
///
/// # Examples
/// ```
/// let mit = license::from_id_ext("MIT").unwrap();
/// let perm = mit.permissions();
/// assert!(perm.private_use() && perm.commercial_use());
/// ```
pub fn from_id_ext(id: &str) -> Option<&'static dyn LicenseExt> {
    match id {
        "AFL-3.0" => Some(&AFL_3_0),
        "AGPL-3.0-only" => Some(&AGPL_3_0_only),
        "Apache-2.0" => Some(&Apache_2_0),
        "0BSD" => Some(&BSD_0),
        "BSD-2-Clause" => Some(&BSD_2_Clause),
        "BSD-3-Clause" => Some(&BSD_3_Clause),
        "BSD-3-Clause-Clear" => Some(&BSD_3_Clause_Clear),
        "BSL-1.0" => Some(&BSL_1_0),
        "CC0-1.0" => Some(&CC0_1_0),
        "ECL-2.0" => Some(&ECL_2_0),
        "GPL-3.0-only" => Some(&GPL_3_0_only),
        "LGPL-3.0-only" => Some(&LGPL_3_0_only),
        "MIT" => Some(&MIT),
        "MPL-2.0" => Some(&MPL_2_0),
        "MS-PL" => Some(&MS_PL),
        "OSL-3.0" => Some(&OSL_3_0),
        "Unlicense" => Some(&Unlicense),
        "WTFPL" => Some(&WTFPL),
        "Zlib" => Some(&Zlib),
        _ => None,
    }
}

/// The permissions of the license.
///
/// # Examples
/// ```
/// let mit = license::from_id_ext("MIT").unwrap();
/// let perm = mit.permissions();
/// assert!(perm.private_use() && perm.commercial_use());
/// ```
#[derive(Copy, Clone, Debug, Default, Hash, Ord, PartialOrd, Eq, PartialEq)]
pub struct Permissions {
    commercial_use: bool,
    distribution: bool,
    modification: bool,
    patent_rights: bool,
    private_use: bool,
}

impl Permissions {
    /// May be used for commercial purposes.
    pub const fn commercial_use(self) -> bool {
        self.commercial_use
    }

    /// May be distributed.
    pub const fn distribution(self) -> bool {
        self.distribution
    }

    /// May be modified.
    pub const fn modification(self) -> bool {
        self.modification
    }

    /// Provides an express grant of patent rights from contributors.
    pub const fn patent_rights(self) -> bool {
        self.patent_rights
    }

    /// May be used for private purposes.
    pub const fn private_use(self) -> bool {
        self.private_use
    }
}

impl Display for Permissions {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        if self.commercial_use {
            f.write_str("- May be used for commercial purposes.\n")?;
        }
        if self.distribution {
            f.write_str("- May be distributed.\n")?;
        }
        if self.modification {
            f.write_str("- May be modified.\n")?;
        }
        if self.patent_rights {
            f.write_str("- Provides an express grant of patent rights from contributors.\n")?;
        }
        if self.private_use {
            f.write_str("- May be used for private purposes.\n")?;
        }
        Ok(())
    }
}

/// The conditions of the license.
///
/// # Examples
/// ```
/// let mit = license::from_id_ext("MIT").unwrap();
/// let cond = mit.conditions();
/// assert!(cond.license_and_copyright_notice());
/// ```
#[derive(Copy, Clone, Debug, Default, Hash, Ord, PartialOrd, Eq, PartialEq)]
pub struct Conditions {
    disclose_sources: bool,
    document_changes: bool,
    license_and_copyright_notice: bool,
    network_use_is_distribution: bool,
    same_license: bool,
}

impl Conditions {
    /// Source code must be made available when the software is distributed.
    pub const fn disclose_sources(self) -> bool {
        self.disclose_sources
    }

    /// Changes made to the code must be documented.
    pub const fn document_changes(self) -> bool {
        self.document_changes
    }

    /// The license and copyright notice must be included with the software.
    pub const fn license_and_copyright_notice(self) -> bool {
        self.license_and_copyright_notice
    }

    /// Users who interact with the software via network are
    /// given the right to receive a copy of the source code.
    pub const fn network_use_is_distribution(self) -> bool {
        self.network_use_is_distribution
    }

    /// Modifications must be released under the same license.
    pub const fn same_license(self) -> bool {
        self.same_license
    }
}

impl Display for Conditions {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        if self.disclose_sources {
            f.write_str(
                "- Source code must be made available when the software is distributed.\n",
            )?;
        }
        if self.document_changes {
            f.write_str("- Changes made to the code must be documented.\n")?;
        }
        if self.license_and_copyright_notice {
            f.write_str(
                "- The license and copyright notice must be included with the software.\n",
            )?;
        }
        if self.network_use_is_distribution {
            f.write_str("- Users who interact with the software via network are given the right to receive a copy of the source code.\n")?;
        }
        if self.same_license {
            f.write_str("- Modifications must be released under the same license.\n")?;
        }
        Ok(())
    }
}

/// The limitations of the license.
///
/// # Examples
/// ```
/// let mit = license::from_id_ext("MIT").unwrap();
/// let lim = mit.limitations();
/// assert!(lim.no_liability() && lim.no_warranty());
/// ```
#[derive(Copy, Clone, Debug, Default, Hash, Ord, PartialOrd, Eq, PartialEq)]
pub struct Limitations {
    no_liability: bool,
    no_trademark_rights: bool,
    no_warranty: bool,
    no_patent_rights: bool,
}

impl Limitations {
    /// Includes a limitation of liability.
    pub const fn no_liability(self) -> bool {
        self.no_liability
    }

    /// Does not grant trademark rights.
    pub const fn no_trademark_rights(self) -> bool {
        self.no_trademark_rights
    }

    /// Does not provide any warranty.
    pub const fn no_warranty(self) -> bool {
        self.no_warranty
    }

    /// Does not provide any rights in the patents of contributors.
    pub const fn no_patent_rights(self) -> bool {
        self.no_patent_rights
    }
}

impl Display for Limitations {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        if self.no_liability {
            f.write_str("- Includes a limitation of liability.\n")?;
        }
        if self.no_trademark_rights {
            f.write_str("- Does not grant trademark rights.\n")?;
        }
        if self.no_warranty {
            f.write_str("- Does not provide any warranty.\n")?;
        }
        if self.no_patent_rights {
            f.write_str("- Does not provide any rights in the patents of contributors.\n")?;
        }
        Ok(())
    }
}

macro_rules! impl_ext {
    (
        $(impl $struct:ident {
            permissions: $($permissions:ident)|*;
            conditions: $($conditions:ident)|*;
            limitations: $($limitations:ident)|*;
        })*
    ) => {
        $(impl LicenseExt for $struct {
            fn permissions(&self) -> Permissions {
                Permissions {
                    $($permissions: true,)*
                    ..Default::default()
                }
            }

            fn conditions(&self) -> Conditions {
                Conditions {
                    $($conditions: true,)*
                    ..Default::default()
                }
            }

            fn limitations(&self) -> Limitations {
                Limitations {
                    $($limitations: true,)*
                    ..Default::default()
                }
            }
        })*
    };
}

impl_ext! {
    impl AFL_3_0 {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions:  document_changes | license_and_copyright_notice;
        limitations: no_liability | no_trademark_rights | no_warranty;
    }
    impl AGPL_3_0_only {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: disclose_sources | document_changes | license_and_copyright_notice | network_use_is_distribution | same_license;
        limitations: no_liability | no_warranty;
    }
    impl Apache_2_0 {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: document_changes | license_and_copyright_notice;
        limitations: no_liability | no_trademark_rights | no_warranty;
    }
    impl BSD_0 {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: ;
        limitations: no_liability | no_warranty;
    }
    impl BSD_2_Clause {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_liability | no_warranty;
    }
    impl BSD_3_Clause {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_liability | no_warranty;
    }
    impl BSD_3_Clause_Clear {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_liability | no_warranty | no_patent_rights;
    }
    impl BSL_1_0 {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_liability | no_warranty;
    }
    impl CC0_1_0 {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: ;
        limitations: no_liability | no_trademark_rights | no_warranty | no_patent_rights;
    }
    impl ECL_2_0 {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: document_changes | license_and_copyright_notice;
        limitations: no_liability | no_trademark_rights | no_warranty;
    }
    impl GPL_3_0_only {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: disclose_sources | document_changes | license_and_copyright_notice | same_license;
        limitations: no_liability | no_warranty;
    }
    impl LGPL_3_0_only {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: disclose_sources | document_changes | license_and_copyright_notice | same_license;
        limitations: no_liability | no_warranty;
    }
    impl MIT {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_liability | no_warranty;
    }
    impl MPL_2_0 {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: disclose_sources | license_and_copyright_notice | same_license;
        limitations: no_liability | no_trademark_rights | no_warranty;
    }
    impl MS_PL {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: license_and_copyright_notice;
        limitations: no_trademark_rights | no_warranty;
    }
    impl OSL_3_0 {
        permissions: commercial_use | distribution | modification | patent_rights | private_use;
        conditions: disclose_sources | document_changes | license_and_copyright_notice | network_use_is_distribution | same_license;
        limitations: no_liability | no_trademark_rights | no_warranty;
    }
    impl Unlicense {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: ;
        limitations: no_liability | no_warranty;
    }
    impl WTFPL {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: ;
        limitations: ;
    }
    impl Zlib {
        permissions: commercial_use | distribution | modification | private_use;
        conditions: document_changes | license_and_copyright_notice;
        limitations: no_liability | no_warranty;
    }
}