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/*
 * includes/includer/debug.rs
 *
 * ftml - Library to parse Wikidot text
 * Copyright (C) 2019-2021 Wikijump Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use super::prelude::*;
use crate::includes::IncludeVariables;
use std::fmt::{self, Display};
use void::Void;

#[derive(Debug)]
pub struct DebugIncluder;

impl<'t> Includer<'t> for DebugIncluder {
    type Error = Void;

    #[inline]
    fn include_pages(
        &mut self,
        includes: &[IncludeRef<'t>],
    ) -> Result<Vec<FetchedPage<'t>>, Void> {
        let mut first = true;
        let mut pages = Vec::new();

        for include in includes {
            let content = if first && includes.len() > 1 {
                // If the requested inclusions are greater than one,
                // then have the list be a missing page.
                //
                // This lets us test the no_such_include() method,
                // without it affecting typical single-include test cases.

                first = false;
                None
            } else {
                let content = format!(
                    "<INCLUDED-PAGE {} {}>",
                    include.page_ref(),
                    MapWrap(include.variables()),
                );

                Some(Cow::Owned(content))
            };

            let page_ref = include.page_ref().clone();

            pages.push(FetchedPage { page_ref, content });
        }

        Ok(pages)
    }

    #[inline]
    fn no_such_include(&mut self, page_ref: &PageRef<'t>) -> Result<Cow<'t, str>, Void> {
        Ok(Cow::Owned(format!("<MISSING-PAGE {}>", page_ref)))
    }
}

/// Rendering a `HashMap` as a string, sorted alphabetically.
///
/// Avoids the uncertain key-value pair ordering inherent in the `Debug`
/// implementation, which could cause tests to be flakey or system-dependent.
#[derive(Debug)]
struct MapWrap<'m, 't>(&'m IncludeVariables<'t>);

impl<'t> Display for MapWrap<'_, 't> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // Get all entries and sort by key
        let mut entries: Vec<(&Cow<'t, str>, &Cow<'t, str>)> = self.0.iter().collect();
        entries.sort_by(|(key1, _), (key2, _)| key1.cmp(key2));

        // Write all entries
        write!(f, "{{")?;

        for (i, (key, value)) in entries.iter().enumerate() {
            write!(f, "{:?} => {:?}", key, value)?;

            if i < entries.len() - 1 {
                write!(f, ", ")?;
            }
        }

        write!(f, "}}")?;

        // Return
        Ok(())
    }
}

#[test]
fn map_wrap() {
    macro_rules! test {
        ($input:expr, $expected:expr,) => {
            test!($input, $expected)
        };

        ($input:expr, $expected:expr) => {{
            // Get what was actually specified as the input,
            // stripping out the "hashmap!".
            let raw_input = &stringify!($input)[9..];

            // Convert string literals into Cows
            let input = {
                let original = $input;
                let mut map = HashMap::new();

                for (key, value) in original {
                    let key = Cow::Borrowed(key);
                    let value = Cow::Borrowed(value);

                    map.insert(key, value);
                }

                map
            };

            let actual = MapWrap(&input).to_string();

            println!("Input:    {}", raw_input);
            println!("Actual:   {}", actual);
            println!("Expected: {}", $expected);
            println!();

            assert_eq!(
                &actual, $expected,
                "Actual format string didn't match expected"
            );
        }};
    }

    test!(hashmap! {}, "{}");
    test!(hashmap! { "apple" => "1" }, r#"{"apple" => "1"}"#);
    test!(
        hashmap! { "apple" => "1", "banana" => "2" },
        r#"{"apple" => "1", "banana" => "2"}"#,
    );
    test!(
        hashmap! { "banana" => "2", "apple" => "1" },
        r#"{"apple" => "1", "banana" => "2"}"#,
    );
    test!(
        hashmap! { "apple" => "1", "banana" => "2", "cherry" => "3" },
        r#"{"apple" => "1", "banana" => "2", "cherry" => "3"}"#,
    );
    test!(
        hashmap! { "banana" => "2", "apple" => "1", "cherry" => "3" },
        r#"{"apple" => "1", "banana" => "2", "cherry" => "3"}"#,
    );
    test!(
        hashmap! { "cherry" => "3", "banana" => "2", "apple" => "1" },
        r#"{"apple" => "1", "banana" => "2", "cherry" => "3"}"#,
    );
    test!(
        hashmap! { "apple" => "1", "cherry" => "3", "banana" => "2" },
        r#"{"apple" => "1", "banana" => "2", "cherry" => "3"}"#,
    );
}