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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("./app/State.zig");

pub const Inputs = struct {
    core_id: ?[]const u8 = null,
    file_path: ?[]const u8,
    ephemeral: bool = false,

    pub const ParseError = error{
        MissingCoreId,
    };

    pub fn parse(self: Inputs) ParseError!ParsedInputs {
        const core_id = self.core_id orelse return error.MissingCoreId;

        return .{
            .core_id = core_id,
            .file_path = self.file_path orelse State.default_path,
            .ephemeral = self.ephemeral,
        };
    }
};

const ParsedInputs = struct {
    core_id: []const u8,
    file_path: []const u8,
    ephemeral: bool,
};

pub const App = struct {
    allocator: std.mem.Allocator,
    state: *State,
    app: *core.Application,
    connect_result: *core.Application.ConnectResult,

    pub const InitError = error{
        ServerFindError,
        ServerNotFound,
        UnableToConnect,
    };

    pub fn init(allocator: std.mem.Allocator, inputs: ParsedInputs) !@This() {
        var state = try allocator.create(State);
        state.* = State.init(allocator, .{}) catch |err| {
            std.log.err("Failed to prepare application state: {s}", .{@errorName(err)});
            return err;
        };
        errdefer state.deinit();

        const scanner = core.server.ServerScanner.make() orelse {
            std.log.err("Unable to create a scanner: out of memory", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };
        defer scanner.free();

        const core_id_cstr = allocator.dupeZ(u8, inputs.core_id) catch |err| {
            std.log.err("Failed to create connection: OOM", .{});
            return err;
        };
        defer allocator.free(core_id_cstr);

        var result = scanner.find(core_id_cstr.ptr, core_id_cstr.len) orelse {
            std.log.err("Unable to find server: out of memory", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };
        defer result.free();

        if (result.code != .ok) {
            std.log.err("Failed to find server: {s}", .{@tagName(result.code)});
            return InitError.ServerFindError;
        }

        const server = result.server orelse {
            std.log.err("No Roon Server found for id={s}", .{inputs.core_id});
            return InitError.ServerNotFound;
        };

        const app_ptr = core.Application.makeFromServer(server);
        const app = app_ptr orelse {
            std.log.err("Failed to initialize Application: OOM", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };

        var token: ?[:0]const u8 = null;
        for (state.registrations.items) |r| {
            if (std.mem.eql(u8, r.core_id, inputs.core_id)) {
                token = allocator.dupeZ(u8, r.token) catch |err| {
                    std.log.err("Failed to copy token: {s}", .{@errorName(err)});
                    return err;
                };
                break;
            }
        }
        defer if (token) |tok| allocator.free(tok);

        const connect_result = app.connect(if (token) |tok| tok.ptr else null) orelse {
            std.log.err("Unable to allocate connection result struct: OOM", .{});
            return std.mem.Allocator.Error.OutOfMemory;
        };

        if (connect_result.code != .ok) {
            std.log.err(
                "Unable to connect to Roon server: {s}",
                .{@tagName(connect_result.code)},
            );
            return InitError.UnableToConnect;
        }

        const new_token = if (connect_result.token) |tok| tok[0..connect_result.token_len] else {
            std.log.err("Succesfully connected but got empty token", .{});
            return InitError.UnableToConnect;
        };

        state.putToken(inputs.core_id, new_token) catch |err| {
            std.log.err("Failed to save new token: {s}", .{@errorName(err)});
            return err;
        };

        state.save() catch |err| {
            std.log.err("Failed to save state to disk: {s}", .{@errorName(err)});
            return err;
        };

        return .{
            .allocator = allocator,
            .state = state,
            .app = app,
            .connect_result = connect_result,
        };
    }

    pub fn deinit(self: *@This()) void {
        self.connect_result.free();
        self.state.deinit();
        self.allocator.destroy(self.state);
        self.app.free();
    }
};