use std::path::PathBuf;

fn main() {
    let proto_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("../../proto")
        .canonicalize()
        .expect("proto root must exist");

    let proto_files = [
        proto_root.join("continuum/v1/material.proto"),
        proto_root.join("continuum/v1/print_params.proto"),
        proto_root.join("continuum/v1/template.proto"),
        proto_root.join("continuum/v1/print_job.proto"),
        proto_root.join("bambulab/common.proto"),
        proto_root.join("bambulab/v1/request.proto"),
        proto_root.join("bambulab/v1/report.proto"),
        proto_root.join("bambulab/v2/request.proto"),
        proto_root.join("bambulab/v2/report.proto"),
    ];

    for file in &proto_files {
        println!("cargo:rerun-if-changed={}", file.display());
    }

    let mut config = prost_build::Config::new();

    // continuum.v1 — Continuum's own cross-service API. camelCase to match
    // the TS side's existing convention (this is a schema we designed
    // ourselves, so we get to pick the convention).
    config.type_attribute(".continuum", "#[derive(serde::Serialize, serde::Deserialize)]");
    config.type_attribute(".continuum", "#[serde(rename_all = \"camelCase\")]");

    // bambulab.* — mirrors Bambu's actual MQTT wire JSON exactly
    // (snake_case), because this isn't a schema we get to design: it's
    // edge-only traffic (continuum-proxy only, never crosses into TS) that
    // has to match whatever the printer actually sends, byte for byte.
    //
    // IMPORTANT: these two type_attribute calls are scoped to ".bambulab"
    // specifically, not "." (global) — type_attribute calls are cumulative,
    // so a "." blanket rule here would stack a second, conflicting
    // #[serde(rename_all = ...)] onto every bambulab type alongside this
    // one and fail to compile. Verified: see commit history for this file.
    config.type_attribute(".bambulab", "#[derive(serde::Serialize, serde::Deserialize)]");
    config.type_attribute(".bambulab", "#[serde(rename_all = \"snake_case\")]");

    // Some Bambu response fields aren't always present (e.g. `result`/
    // `reason` on some info responses) — serde requires every struct field
    // present in the JSON unless told otherwise. Add one line per such
    // field as you find them, e.g.:
    //   config.field_attribute(".bambulab.v1.InfoResponse.result", "#[serde(default)]");
    //
    // Do NOT try to model the top-level {"info": {...}} / {"pushing": {...}}
    // envelope as a proto `oneof` here — prost-build's field/variant
    // attribute matching can't distinguish "the oneof field" from "the
    // variants inside it" (both match the same path prefix), so
    // `#[serde(flatten)]` lands in the wrong place and won't compile. Write
    // the envelope as a plain Rust enum instead, in continuum-proxy —
    // serde's default enum representation already produces exactly
    // {"info": {...}} with no configuration at all. See
    // continuum-proxy/src/printer/bambu_protocol.rs.

    config
        .compile_protos(&proto_files, &[proto_root])
        .expect("failed to compile continuum .proto sources");
}