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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 core = @import("core");

const State = @import("./State.zig");

pub const MakeError = error{
    NoSavedConnection,
    FailedToFindServer,
    ServerNotFound,
};

pub fn make(allocator: std.mem.Allocator) !*core.connection.Connection {
    const server_id, const saved_token = state: {
        const state = State.read(allocator) catch |err| {
            std.log.err("Failed to read state file: {s}", .{@errorName(err)});
            return err;
        };
        defer state.deinit();

        const conn = state.value.connection orelse {
            std.log.err("No previous connection: connect to server first", .{});
            return MakeError.NoSavedConnection;
        };

        const server_id = allocator.dupeZ(u8, conn.server_id) catch {
            std.log.err("Failed to restore server ID from state file: Out of memory", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };
        errdefer allocator.free(server_id);

        const saved_token = allocator.dupeZ(u8, conn.token) catch {
            std.log.err("Failed to restore token from state file: Out of memory", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };

        break :state .{ server_id, saved_token };
    };

    defer allocator.free(server_id);
    defer allocator.free(saved_token);

    const find_result = core.discovery.find(server_id.ptr) orelse {
        std.log.err("Unable to get server info: Out of memory", .{});
        return std.mem.Allocator.Error.OutOfMemory;
    };
    defer find_result.release();

    if (find_result.code != .ok) {
        std.log.err("Failed to get server info: {s}", .{@tagName(find_result.code)});
        return MakeError.FailedToFindServer;
    }

    if (find_result.servers_len == 0) {
        std.log.err("Server not found for ID={s}", .{server_id});
        return MakeError.ServerNotFound;
    }

    const server = find_result.servers_ptr[0];

    return core.connection.Connection.make(server, saved_token.ptr) orelse {
        std.log.err("Unable to connect: Out of memory", .{});
        return std.mem.Allocator.Error.OutOfMemory;
    };
}