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// Copyright 2021, 2022 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use serde_with::skip_serializing_none;
use url::Url;

use super::ConfigurationSection;

/// Propagation format for incoming and outgoing requests
#[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "lowercase")]
pub enum Propagator {
    /// Propagate according to the W3C Trace Context specification
    TraceContext,

    /// Propagate according to the W3C Baggage specification
    Baggage,

    /// Propagate trace context with Jaeger compatible headers
    Jaeger,
}

#[allow(clippy::unnecessary_wraps)]
fn otlp_endpoint_default() -> Option<String> {
    Some("https://localhost:4318".to_owned())
}

/// Exporter to use when exporting traces
#[skip_serializing_none]
#[derive(Clone, Copy, Debug, Serialize, Deserialize, JsonSchema, Default)]
#[serde(rename_all = "lowercase")]
pub enum TracingExporterKind {
    /// Don't export traces
    #[default]
    None,

    /// Export traces to the standard output. Only useful for debugging
    Stdout,

    /// Export traces to an OpenTelemetry protocol compatible endpoint
    Otlp,
}

/// Configuration related to exporting traces
#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
pub struct TracingConfig {
    /// Exporter to use when exporting traces
    #[serde(default)]
    pub exporter: TracingExporterKind,

    /// OTLP exporter: OTLP over HTTP compatible endpoint
    #[serde(skip_serializing_if = "Option::is_none")]
    #[schemars(url, default = "otlp_endpoint_default")]
    pub endpoint: Option<Url>,

    /// List of propagation formats to use for incoming and outgoing requests
    pub propagators: Vec<Propagator>,
}

impl TracingConfig {
    /// Returns true if all fields are at their default values
    fn is_default(&self) -> bool {
        matches!(self.exporter, TracingExporterKind::None)
            && self.endpoint.is_none()
            && self.propagators.is_empty()
    }
}

/// Exporter to use when exporting metrics
#[skip_serializing_none]
#[derive(Clone, Copy, Debug, Serialize, Deserialize, JsonSchema, Default)]
#[serde(rename_all = "lowercase")]
pub enum MetricsExporterKind {
    /// Don't export metrics
    #[default]
    None,

    /// Export metrics to stdout. Only useful for debugging
    Stdout,

    /// Export metrics to an OpenTelemetry protocol compatible endpoint
    Otlp,

    /// Export metrics via Prometheus. An HTTP listener with the `prometheus`
    /// resource must be setup to expose the Promethes metrics.
    Prometheus,
}

/// Configuration related to exporting metrics
#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
pub struct MetricsConfig {
    /// Exporter to use when exporting metrics
    #[serde(default)]
    pub exporter: MetricsExporterKind,

    /// OTLP exporter: OTLP over HTTP compatible endpoint
    #[serde(skip_serializing_if = "Option::is_none")]
    #[schemars(url, default = "otlp_endpoint_default")]
    pub endpoint: Option<Url>,
}

impl MetricsConfig {
    /// Returns true if all fields are at their default values
    fn is_default(&self) -> bool {
        matches!(self.exporter, MetricsExporterKind::None) && self.endpoint.is_none()
    }
}

fn sentry_dsn_example() -> &'static str {
    "https://public@host:port/1"
}

/// Configuration related to the Sentry integration
#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
pub struct SentryConfig {
    /// Sentry DSN
    #[schemars(url, example = "sentry_dsn_example")]
    #[serde(skip_serializing_if = "Option::is_none")]
    pub dsn: Option<String>,
}

impl SentryConfig {
    /// Returns true if all fields are at their default values
    fn is_default(&self) -> bool {
        self.dsn.is_none()
    }
}

/// Configuration related to sending monitoring data
#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
pub struct TelemetryConfig {
    /// Configuration related to exporting traces
    #[serde(default, skip_serializing_if = "TracingConfig::is_default")]
    pub tracing: TracingConfig,

    /// Configuration related to exporting metrics
    #[serde(default, skip_serializing_if = "MetricsConfig::is_default")]
    pub metrics: MetricsConfig,

    /// Configuration related to the Sentry integration
    #[serde(default, skip_serializing_if = "SentryConfig::is_default")]
    pub sentry: SentryConfig,
}

impl TelemetryConfig {
    /// Returns true if all fields are at their default values
    pub(crate) fn is_default(&self) -> bool {
        self.tracing.is_default() && self.metrics.is_default() && self.sentry.is_default()
    }
}

impl ConfigurationSection for TelemetryConfig {
    const PATH: Option<&'static str> = Some("telemetry");
}