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use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::fs::{self};
use std::fmt::Display;

use console::Style;
use similar::text::{ChangeTag, TextDiff};
use super::*;

struct FailedTestResult {
    file_path: String,
    expected: String,
    actual: String,
    actual_second: Option<String>,
    message: String,
}
struct DiffFailedMessage<'a> {
    expected: &'a str,
    actual: &'a str
}
impl<'a> Display for DiffFailedMessage<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let diff = TextDiff::from_lines(self.expected, self.actual);

        for op in diff.ops() {
            for change in diff.iter_changes(op) {
                let (sign, style) = match change.tag() {
                    ChangeTag::Delete => ("-", Style::new().green()),
                    ChangeTag::Insert => ("+", Style::new().red()),
                    ChangeTag::Equal => (" ", Style::new()),
                };
                write!(
                    f,
                    "{}{}",
                    style.apply_to(sign).bold(),
                    style.apply_to(change),
                )?;
            }
        }
        Ok(())
    }
}
pub struct RunSpecsOptions {
    /// Set to true to overwrite the failing tests with the actual result.
    pub fix_failures: bool,
    pub format_twice: bool,
}

pub fn run_specs(
    directory_path: &Path,
    parse_spec_options: &ParseSpecOptions,
    run_spec_options: &RunSpecsOptions,
    format_text: impl Fn(&Path, &str, &HashMap<String, String>) -> Result<String, String>
) {
    #[cfg(not(debug_assertions))]
    assert_not_fix_failures(run_spec_options);

    let specs = get_specs_in_dir(&directory_path, &parse_spec_options);
    let test_count = specs.len();
    let mut failed_tests = Vec::new();

    for (file_path, spec) in specs.into_iter().filter(|(_, spec)| !spec.skip) {
        #[cfg(not(debug_assertions))]
        assert_spec_not_only(&spec);

        let format = |file_text: &str| {
            format_text(&PathBuf::from(&spec.file_name), &file_text, &spec.config)
                .expect(format!("Could not parse spec '{}' in {}", spec.message, file_path).as_str())
        };

        let result = format(&spec.file_text);
        if result != spec.expected_text {
            if run_spec_options.fix_failures {
                // very rough, but good enough
                let file_path = PathBuf::from(&file_path);
                let file_text = fs::read_to_string(&file_path).expect("Expected to read the file.");
                let file_text = file_text.replace(&spec.expected_text.replace("\n", "\r\n"), &result.replace("\n", "\r\n"));
                fs::write(&file_path, file_text).expect("Expected to write to file.");
            } else {
                failed_tests.push(FailedTestResult {
                    file_path: file_path.clone(),
                    expected: spec.expected_text.clone(),
                    actual: result,
                    actual_second: None,
                    message: spec.message.clone()
                });
            }
        } else if run_spec_options.format_twice && !spec.skip_format_twice {
            // ensure no changes when formatting twice
            let twice_result = format(&result);
            if twice_result != spec.expected_text {
                failed_tests.push(FailedTestResult {
                    file_path: file_path.clone(),
                    expected: spec.expected_text.clone(),
                    actual: result,
                    actual_second: Some(twice_result),
                    message: spec.message.clone()
                });
            }
        }
    }

    for failed_test in &failed_tests {
        println!("---");
        let mut failed_message = format!(
            "Failed:   {} ({})\nExpected: `{:?}`,\nActual:   `{:?}`,`,\nDiff:\n{}",
            failed_test.message,
            failed_test.file_path,
            failed_test.expected,
            failed_test.actual,
            DiffFailedMessage {
                actual: &failed_test.actual,
                expected:&failed_test.expected
            }
        );
        if let Some(actual_second) = &failed_test.actual_second {
            failed_message.push_str(&format!(
                "\nTwice:    `{:?}`",
                actual_second
            ));
        }
        println!("{}", failed_message);
    }

    if !failed_tests.is_empty() {
        println!("---");
        panic!("{}/{} tests passed", test_count - failed_tests.len(), test_count);
    }

    #[cfg(not(debug_assertions))]
    fn assert_spec_not_only(spec: &Spec) {
        if spec.is_only {
            panic!("Cannot run 'only' spec in release mode: {}", spec.message);
        }
    }

    #[cfg(not(debug_assertions))]
    fn assert_not_fix_failures(run_spec_options: &RunSpecsOptions) {
        if run_spec_options.fix_failures {
            panic!("Cannot have 'fix_failures' as `true` in release mode.");
        }
    }
}