const std = @import("std");

pub const Config = struct {
    api_key: []const u8,
    base_url: []const u8,
    model: []const u8,

    pub const Error = error{MissingApiKey};

    pub fn fromEnv() Error!Config {
        const api_key_z = std.c.getenv("PANTO_API_KEY") orelse return Error.MissingApiKey;
        const api_key = std.mem.sliceTo(api_key_z, 0);

        const base_url_z = std.c.getenv("PANTO_BASE_URL") orelse "https://api.openai.com/v1";
        const base_url = std.mem.sliceTo(base_url_z, 0);

        const model_z = std.c.getenv("PANTO_MODEL") orelse "gpt-4o";
        const model = std.mem.sliceTo(model_z, 0);

        return Config{
            .api_key = api_key,
            .base_url = base_url,
            .model = model,
        };
    }
};

test "Config - defaults" {
    const cfg = Config{
        .api_key = "test-key",
        .base_url = "https://api.openai.com/v1",
        .model = "gpt-4o",
    };
    try std.testing.expectEqualStrings("test-key", cfg.api_key);
    try std.testing.expectEqualStrings("https://api.openai.com/v1", cfg.base_url);
    try std.testing.expectEqualStrings("gpt-4o", cfg.model);
}