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use ProcResult;

use std::collections::HashMap;

/// Represents the data from `/proc/cpuinfo`.
///
/// The `fields` field stores the fields that are common among all CPUs.  The `cpus` field stores
/// CPU-specific info.
///
/// For common fields, there are methods that will return the data, converted to a more appropriate
/// data type.  These methods will all return `None` if the field doesn't exist, or is in some
/// unexpected format (in that case, you'll have to access the string data directly).
#[derive(Debug)]
pub struct CpuInfo {
    /// This stores fields that are common among all CPUs
    pub fields: HashMap<String, String>,
    pub cpus: Vec<HashMap<String, String>>,
}

impl CpuInfo {
    /// Get the total number of cpu cores.
    ///
    /// This is the number of entries in the `/proc/cpuinfo` file.
    pub fn num_cores(&self) -> usize {
        self.cpus.len()
    }

    /// Get info for a specific cpu.
    ///
    /// This will merge the common fields with the cpu-specific fields.
    ///
    /// Returns None if the requested cpu index is not found.
    pub fn get_info(&self, cpu_num: usize) -> Option<HashMap<&str, &str>> {
        if let Some(info) = self.cpus.get(cpu_num) {
            let mut map = HashMap::new();

            for (k, v) in &self.fields {
                map.insert(k.as_ref(), v.as_ref());
            }

            for (k, v) in info.iter() {
                map.insert(k.as_ref(), v.as_ref());
            }

            Some(map)
        } else {
            None
        }
    }

    pub fn model_name(&self, cpu_num: usize) -> Option<&str> {
        self.get_info(cpu_num)
            .and_then(|mut m| m.remove("model name"))
    }
    pub fn vendor_id(&self, cpu_num: usize) -> Option<&str> {
        self.get_info(cpu_num)
            .and_then(|mut m| m.remove("vendor_id"))
    }
    pub fn physical_id(&self, cpu_num: usize) -> Option<u32> {
        self.get_info(cpu_num)
            .and_then(|mut m| m.remove("vendor_id"))
            .and_then(|s| u32::from_str_radix(s, 10).ok())
    }
    pub fn flags(&self, cpu_num: usize) -> Option<Vec<&str>> {
        self.get_info(cpu_num)
            .and_then(|mut m| m.remove("flags"))
            .map(|flags: &str| flags.split_whitespace().collect())
    }
}

pub fn cpuinfo() -> ProcResult<CpuInfo> {
    use std::fs::File;
    use std::io::{BufRead, BufReader};

    let file = proctry!(File::open("/proc/cpuinfo"));
    let reader = BufReader::new(file);

    let mut list = Vec::new();
    let mut map = Some(HashMap::new());

    for line in reader.lines() {
        if let Ok(line) = line {
            if !line.is_empty() {
                let mut s = line.split(':');
                let key = s.next().unwrap();
                if let Some(value) = s.next() {
                    let key = key.trim().to_owned();
                    let value = value.trim().to_owned();

                    map.get_or_insert(HashMap::new()).insert(key, value);
                }
            } else if let Some(map) = map.take() {
                list.push(map);
            }
        }
    }
    if let Some(map) = map.take() {
        list.push(map);
    }

    // find properties that are the same for all cpus
    assert!(!list.is_empty());

    let common_fields: Vec<String> = list[0]
        .iter()
        .filter_map(|(key, val)| {
            if list
                .iter()
                .all(|map| map.get(key).map_or(false, |v| v == val))
            {
                Some(key.clone())
            } else {
                None
            }
        })
        .collect();

    let mut common_map = HashMap::new();
    for (k, v) in &list[0] {
        if common_fields.contains(k) {
            common_map.insert(k.clone(), v.clone());
        }
    }

    for map in &mut list {
        map.retain(|k, _| !common_fields.contains(k));
    }

    print!("{:?}", common_fields);

    ProcResult::Ok(CpuInfo {
        fields: common_map,
        cpus: list,
    })
}

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

    #[test]
    fn test_cpuinfo() {
        let info = cpuinfo().unwrap();
        println!("{:#?}", info.flags(0));

        //assert_eq!(info.num_cores(), 8);
    }

}