use std::fmt::Display;

use chrono::NaiveDateTime;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub struct Version {
    pub major: u16,
    pub minor: u8,
    pub build: u8,
}

impl Display for Version {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}.{:0>2}.{:0>2}", self.major, self.minor, self.build)
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct IcfInnerData {
    pub id: String,
    pub version: Version,
    pub required_system_version: Version,
    pub datetime: NaiveDateTime,
    
    #[serde(default = "default_is_prerelease")]
    pub is_prerelease: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct IcfOptionData {
    #[serde(skip, default = "empty_string")]
    pub app_id: String,

    pub option_id: String,
    
    #[serde(skip, default = "empty_version")]
    pub required_system_version: Version,
    
    pub datetime: NaiveDateTime,

    #[serde(default = "default_is_prerelease")]
    pub is_prerelease: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct IcfPatchData {
    #[serde(skip, default = "empty_string")]
    pub id: String,

    pub sequence_number: u8,

    pub source_version: Version,
    pub source_datetime: NaiveDateTime,
    pub source_required_system_version: Version,

    pub target_version: Version,
    pub target_datetime: NaiveDateTime,
    pub target_required_system_version: Version,

    #[serde(default = "default_is_prerelease")]
    pub is_prerelease: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum IcfData {
    System(IcfInnerData),
    App(IcfInnerData),
    Patch(IcfPatchData),
    Option(IcfOptionData),
}

impl IcfData {
    pub fn is_prerelease(&self) -> bool {
        match self {
            IcfData::System(s) => s.is_prerelease,
            IcfData::App(a) => a.is_prerelease,
            IcfData::Option(o) => o.is_prerelease,
            IcfData::Patch(p) => p.is_prerelease,
        }
    }

    pub fn filename(&self) -> String {
        match self {
            IcfData::System(data) => format!(
                "{}_{:04}.{:02}.{:02}_{}_0.pack",
                data.id,
                data.version.major,
                data.version.minor,
                data.version.build,
                data.datetime.format("%Y%m%d%H%M%S")
            ),
            IcfData::App(data) => format!(
                "{}_{}_{}_0.app",
                data.id,
                data.version,
                data.datetime.format("%Y%m%d%H%M%S")
            ),
            IcfData::Option(data) => format!(
                "{}_{}_{}_0.opt",
                data.app_id,
                data.option_id,
                data.datetime.format("%Y%m%d%H%M%S")
            ),
            IcfData::Patch(data) => format!(
                "{}_{}_{}_{}_{}.app",
                data.id,
                data.target_version,
                data.target_datetime.format("%Y%m%d%H%M%S"),
                data.sequence_number,
                data.source_version,
            ),
        }
    }
}

fn empty_string() -> String {
    String::new()
}

fn empty_version() -> Version {
    Version { major: 0, minor: 0, build: 0 }
}

fn default_is_prerelease() -> bool {
    false
}