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// Copyright 2025 Shota FUJI
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

const std = @import("std");

const ExtensionRegistration = struct {
    core_id: []const u8,
    token: []const u8,
};

const FileContent = struct {
    registrations: []ExtensionRegistration,
};

registrations: std.ArrayList(ExtensionRegistration),
allocator: std.mem.Allocator,
file_path: ?[]const u8,

/// Unless user provided custom file path, connection state will be saved to
/// and loaded from this file.
pub const default_path = ".roon.json";

/// Creates a new empty state. Save operation on the returned state is no-op.
pub fn initEphemeral(allocator: std.mem.Allocator) @This() {
    return .{
        .registrations = std.ArrayList(ExtensionRegistration).init(allocator),
        .allocator = allocator,
        .file_path = null,
    };
}

pub const InitOptions = struct {
    file_path: []const u8 = default_path,
};

pub fn init(allocator: std.mem.Allocator, opts: InitOptions) !@This() {
    const file = std.fs.cwd().openFile(opts.file_path, .{}) catch |err| switch (err) {
        error.FileNotFound => {
            return .{
                .registrations = std.ArrayList(ExtensionRegistration).init(allocator),
                .allocator = allocator,
                .file_path = opts.file_path,
            };
        },
        else => return err,
    };
    defer file.close();

    const contents = try file.readToEndAlloc(allocator, std.math.maxInt(usize));
    defer allocator.free(contents);

    const loaded = try std.json.parseFromSlice(FileContent, allocator, contents, .{});
    defer loaded.deinit();

    var registrations = try allocator.alloc(ExtensionRegistration, loaded.value.registrations.len);
    for (loaded.value.registrations, 0..) |r, i| {
        registrations[i] = .{
            .core_id = try allocator.dupe(u8, r.core_id),
            .token = try allocator.dupe(u8, r.token),
        };
    }

    return @This(){
        .registrations = std.ArrayList(ExtensionRegistration).fromOwnedSlice(allocator, registrations),
        .allocator = allocator,
        .file_path = opts.file_path,
    };
}

/// Update or add token. Updated entry copies input buffer: caller can release input buffers
/// then access struct fields.
pub fn putToken(self: *@This(), core_id: []const u8, token: []const u8) std.mem.Allocator.Error!void {
    for (self.registrations.items) |*r| {
        if (std.mem.eql(u8, r.core_id, core_id)) {
            self.allocator.free(r.token);
            r.token = try self.allocator.dupe(u8, token);
            return;
        }
    }

    try self.registrations.append(.{
        .core_id = try self.allocator.dupe(u8, core_id),
        .token = try self.allocator.dupe(u8, token),
    });
}

pub fn save(self: *const @This()) !void {
    const file_path = self.file_path orelse return;

    const file = try std.fs.cwd().createFile(file_path, .{});
    defer file.close();

    try std.json.stringify(
        FileContent{ .registrations = self.registrations.items },
        .{ .whitespace = .indent_tab },
        file.writer(),
    );
}

pub fn deinit(self: *@This()) void {
    for (self.registrations.items) |r| {
        self.allocator.free(r.core_id);
        self.allocator.free(r.token);
    }
    self.registrations.deinit();
}