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//! The [naming table][1].
//!
//! [1]: https://learn.microsoft.com/en-us/typography/opentype/spec/name

use std::mem;

use crate::{Result, Tape, Value};

/// A naming table.
#[derive(Clone, Debug)]
pub enum NamingTable {
    /// Format 0.
    Format0(NamingTable0),
    /// Format 1.
    Format1(NamingTable1),
}

table! {
    #[doc = "A naming table in format 0."]
    pub NamingTable0 {
        format (u16), // format
        count  (u16), // count
        offset (u16), // stringOffset

        records (Vec<Record>) |this, tape| { // nameRecord
            tape.take_given(this.count as usize)
        },

        data (Vec<u8>) |this, tape| {
            this.read_data(tape)
        },
    }
}

table! {
    #[doc = "A naming table in format 1."]
    pub NamingTable1 {
        format (u16), // format
        count  (u16), // count
        offset (u16), // stringOffset

        records (Vec<Record>) |this, tape| { // nameRecord
            tape.take_given(this.count as usize)
        },

        language_count (u16), // langTagCount

        languages (Vec<Language>) |this, tape| { // langTagRecord
            tape.take_given(this.language_count as usize)
        },

        data (Vec<u8>) |this, tape| {
            this.read_data(tape)
        },
    }
}

table! {
    #[doc = "A record of a naming table."]
    #[derive(Copy)]
    #[repr(C)]
    pub Record { // NameRecord
        platform_id (u16), // platformID
        encoding_id (u16), // encodingID
        language_id (u16), // languageID
        name_id     (u16), // nameID
        length      (u16), // length
        offset      (u16), // offset
    }
}

table! {
    #[doc = "A language-tag record of a naming table."]
    #[derive(Copy)]
    #[repr(C)]
    pub Language { // LangTagRecord
        length (u16), // length
        offset (u16), // offset
    }
}

impl Value for NamingTable {
    fn read<T: Tape>(tape: &mut T) -> Result<Self> {
        Ok(match tape.peek::<u16>()? {
            0 => NamingTable::Format0(tape.take()?),
            1 => NamingTable::Format1(tape.take()?),
            _ => raise!("found an unknown format of the naming table"),
        })
    }
}

impl NamingTable0 {
    #[inline]
    pub fn strings(&self) -> Result<Vec<String>> {
        strings(&self.records, &self.data)
    }

    fn read_data<T: Tape>(&self, tape: &mut T) -> Result<Vec<u8>> {
        let current = tape.position()?;
        let above = 3 * 2 + self.records.len() * mem::size_of::<Record>();
        tape.jump(current - above as u64 + self.offset as u64)?;
        tape.take_bytes(data_length(&self.records))
    }
}

impl NamingTable1 {
    #[inline]
    pub fn strings(&self) -> Result<Vec<String>> {
        strings(&self.records, &self.data)
    }

    fn read_data<T: Tape>(&self, tape: &mut T) -> Result<Vec<u8>> {
        let current = tape.position()?;
        let above = 4 * 2
            + self.records.len() * mem::size_of::<Record>()
            + self.languages.len() * mem::size_of::<Language>();
        tape.jump(current - above as u64 + self.offset as u64)?;
        tape.take_bytes(data_length(&self.records))
    }
}

fn data_length(records: &[Record]) -> usize {
    let mut length = 0;
    for record in records {
        let end = record.offset + record.length;
        if end > length {
            length = end;
        }
    }
    length as usize
}

fn strings(records: &[Record], data: &[u8]) -> Result<Vec<String>> {
    let mut strings = vec![];
    for record in records {
        let (offset, length) = (record.offset as usize, record.length as usize);
        let bytes = &data[offset..(offset + length)];
        let string = match record.platform_id {
            0 => crate::encoding::unicode::decode(bytes, record.encoding_id),
            1 => crate::encoding::macintosh::decode(bytes, record.encoding_id, record.language_id),
            3 => crate::encoding::windows::decode(bytes, record.encoding_id),
            _ => None,
        };
        if let Some(string) = string {
            strings.push(string);
            continue;
        }
        strings.push("<unknown>".to_string());
    }
    Ok(strings)
}