use std::str::FromStr;
use std::time::{Duration, Instant};
use std::{env, fmt};
use super::types::{TestDesc, TestType};
pub const TEST_WARN_TIMEOUT_S: u64 = 60;
pub mod time_constants {
    use std::time::Duration;
    use super::TEST_WARN_TIMEOUT_S;
    pub const UNIT_ENV_NAME: &str = "RUST_TEST_TIME_UNIT";
    pub const UNIT_WARN: Duration = Duration::from_millis(50);
    pub const UNIT_CRITICAL: Duration = Duration::from_millis(100);
    pub const INTEGRATION_ENV_NAME: &str = "RUST_TEST_TIME_INTEGRATION";
    pub const INTEGRATION_WARN: Duration = Duration::from_millis(500);
    pub const INTEGRATION_CRITICAL: Duration = Duration::from_millis(1000);
    pub const DOCTEST_ENV_NAME: &str = "RUST_TEST_TIME_DOCTEST";
    pub const DOCTEST_WARN: Duration = INTEGRATION_WARN;
    pub const DOCTEST_CRITICAL: Duration = INTEGRATION_CRITICAL;
    pub const UNKNOWN_WARN: Duration = Duration::from_secs(TEST_WARN_TIMEOUT_S);
    pub const UNKNOWN_CRITICAL: Duration = Duration::from_secs(TEST_WARN_TIMEOUT_S * 2);
}
pub fn get_default_test_timeout() -> Instant {
    Instant::now() + Duration::from_secs(TEST_WARN_TIMEOUT_S)
}
#[derive(Debug, Clone, PartialEq)]
pub struct TestExecTime(pub Duration);
impl fmt::Display for TestExecTime {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:.3}s", self.0.as_secs_f64())
    }
}
#[derive(Debug, Clone, Default, PartialEq)]
pub struct TestSuiteExecTime(pub Duration);
impl fmt::Display for TestSuiteExecTime {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:.2}s", self.0.as_secs_f64())
    }
}
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct TimeThreshold {
    pub warn: Duration,
    pub critical: Duration,
}
impl TimeThreshold {
    pub fn new(warn: Duration, critical: Duration) -> Self {
        Self { warn, critical }
    }
    pub fn from_env_var(env_var_name: &str) -> Option<Self> {
        let durations_str = env::var(env_var_name).ok()?;
        let (warn_str, critical_str) = durations_str.split_once(',').unwrap_or_else(|| {
            panic!(
                "Duration variable {env_var_name} expected to have 2 numbers separated by comma, but got {durations_str}"
            )
        });
        let parse_u64 = |v| {
            u64::from_str(v).unwrap_or_else(|_| {
                panic!(
                    "Duration value in variable {env_var_name} is expected to be a number, but got {v}"
                )
            })
        };
        let warn = parse_u64(warn_str);
        let critical = parse_u64(critical_str);
        if warn > critical {
            panic!("Test execution warn time should be less or equal to the critical time");
        }
        Some(Self::new(Duration::from_millis(warn), Duration::from_millis(critical)))
    }
}
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct TestTimeOptions {
    pub error_on_excess: bool,
    pub unit_threshold: TimeThreshold,
    pub integration_threshold: TimeThreshold,
    pub doctest_threshold: TimeThreshold,
}
impl TestTimeOptions {
    pub fn new_from_env(error_on_excess: bool) -> Self {
        let unit_threshold = TimeThreshold::from_env_var(time_constants::UNIT_ENV_NAME)
            .unwrap_or_else(Self::default_unit);
        let integration_threshold =
            TimeThreshold::from_env_var(time_constants::INTEGRATION_ENV_NAME)
                .unwrap_or_else(Self::default_integration);
        let doctest_threshold = TimeThreshold::from_env_var(time_constants::DOCTEST_ENV_NAME)
            .unwrap_or_else(Self::default_doctest);
        Self { error_on_excess, unit_threshold, integration_threshold, doctest_threshold }
    }
    pub fn is_warn(&self, test: &TestDesc, exec_time: &TestExecTime) -> bool {
        exec_time.0 >= self.warn_time(test)
    }
    pub fn is_critical(&self, test: &TestDesc, exec_time: &TestExecTime) -> bool {
        exec_time.0 >= self.critical_time(test)
    }
    fn warn_time(&self, test: &TestDesc) -> Duration {
        match test.test_type {
            TestType::UnitTest => self.unit_threshold.warn,
            TestType::IntegrationTest => self.integration_threshold.warn,
            TestType::DocTest => self.doctest_threshold.warn,
            TestType::Unknown => time_constants::UNKNOWN_WARN,
        }
    }
    fn critical_time(&self, test: &TestDesc) -> Duration {
        match test.test_type {
            TestType::UnitTest => self.unit_threshold.critical,
            TestType::IntegrationTest => self.integration_threshold.critical,
            TestType::DocTest => self.doctest_threshold.critical,
            TestType::Unknown => time_constants::UNKNOWN_CRITICAL,
        }
    }
    fn default_unit() -> TimeThreshold {
        TimeThreshold::new(time_constants::UNIT_WARN, time_constants::UNIT_CRITICAL)
    }
    fn default_integration() -> TimeThreshold {
        TimeThreshold::new(time_constants::INTEGRATION_WARN, time_constants::INTEGRATION_CRITICAL)
    }
    fn default_doctest() -> TimeThreshold {
        TimeThreshold::new(time_constants::DOCTEST_WARN, time_constants::DOCTEST_CRITICAL)
    }
}