const std = @import("std");

/// Keys that are available for encryption
keys: []const SSHKeyPair,

/// Rules for how to match the scan command
scan: ScanConfig = .default,

pub const SSHKeyPair = struct {
    private: []const u8,
    public: []const u8,
};

/// Configuration for the scan command
pub const ScanConfig = struct {
    /// the file extension to look for
    matcher: []const u8,

    /// Glob patterns to ignore
    exclude: []const []const u8,

    /// paths to search in
    include: []const []const u8,

    const default: @This() = .{
        .matcher = "\\.env",
        .exclude = &.{
            "*\\.envrc",
            "\\.local",
            "node_modules",
            "vendor",
        },
        .include = &.{"~"},
    };
};

/// Load the Config from the file at path
pub fn load(io: std.Io, gpa: std.mem.Allocator, path: []const u8) !std.json.Parsed(@This()) {
    // TODO: Read ~/.envr/config.json into buffer

    var file = try std.Io.Dir.cwd().openFile(
        io,
        path,
        .{ .mode = .read_only },
    );
    defer file.close(io);

    var buffer: [4096]u8 = undefined;
    var reader = file.reader(io, &buffer);

    var json_reader: std.json.Reader = .init(gpa, &reader.interface);
    defer json_reader.deinit();

    return try std.json.parseFromTokenSource(
        @This(),
        gpa,
        &json_reader,
        .{},
    );
}

pub fn save(
    self: *@This(),
    io: std.Io,
    gpa: std.mem.Allocator,
    path: []const u8,
) !void {
    // FIXME: Implement
    _ = self;
    _ = io;
    _ = gpa;
    _ = path;
}

test "loading the default config from disk matches expected values" {
    const gpa = std.testing.allocator;

    const parsed = try load(std.testing.io, gpa, "./fixtures/default_config.json");
    defer parsed.deinit();

    const got = parsed.value;
    try std.testing.expectEqualDeep(got.scan, ScanConfig.default);
}

test "saving to a new file works" {
    // TODO: assert file doesn't exist

    var cfg: @This() = .{
        .keys = &.{
        //.from_path("~/.ssh/id_ed25519.pub")
        .{
            .public = "~/.ssh/id_ed25519.pub",
            .private = "~/.ssh/id_ed25519",
        }},
    };

    try cfg.save(std.testing.io, std.testing.allocator, "/some/tmp/path");

    // TODO: assert file contents matches expectations.
}

// TODO: test "saving to an existing fie updates the file"