/* Copyright 2021 Aristocratos (jakob@qvantnet.com)

   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.

indent = tab
tab-size = 4
*/

#pragma once

#include <array>
#include <atomic>
#include <deque>
#include <filesystem>
#include <string>
#include <tuple>
#include <vector>
#include <ifaddrs.h>
#include <robin_hood.h>
#include <unistd.h>

using robin_hood::unordered_flat_map;
using std::array;
using std::atomic;
using std::deque;
using std::string;
using std::tuple;
using std::vector;

using namespace std::literals; // for operator""s

void term_resize(bool force=false);
void banner_gen();

extern void clean_quit(int sig);

namespace Global {
	extern const vector<array<string, 2>> Banner_src;
	extern const string Version;
	extern atomic<bool> quitting;
	extern string exit_error_msg;
	extern atomic<bool> thread_exception;
	extern string banner;
	extern atomic<bool> resized;
	extern string overlay;
	extern string clock;
	extern uid_t real_uid, set_uid;
}

namespace Runner {

	extern atomic<bool> active;
	extern atomic<bool> reading;
	extern atomic<bool> stopping;
	extern atomic<bool> redraw;
	extern atomic<bool> coreNum_reset;
	extern pthread_t runner_id;
	extern bool pause_output;
	extern string debug_bg;

    void run(const string& box="", bool no_update = false, bool force_redraw = false);
	void stop();

}

namespace Tools {
	//* Platform specific function for system_uptime (seconds since last restart)
	double system_uptime();
}

namespace Shared {
	//* Initialize platform specific needed variables and check for errors
	void init();

	extern long coreCount, page_size, clk_tck;
}


namespace Cpu {
	extern string box;
	extern int x, y, width, height, min_width, min_height;
	extern bool shown, redraw, got_sensors, cpu_temp_only, has_battery;
	extern string cpuName, cpuHz;
	extern vector<string> available_fields;
	extern vector<string> available_sensors;
	extern tuple<int, long, string> current_bat;

	struct cpu_info {
		unordered_flat_map<string, deque<long long>> cpu_percent = {
			{"total", {}},
			{"user", {}},
			{"nice", {}},
			{"system", {}},
			{"idle", {}},
			{"iowait", {}},
			{"irq", {}},
			{"softirq", {}},
			{"steal", {}},
			{"guest", {}},
			{"guest_nice", {}}
		};
		vector<deque<long long>> core_percent;
		vector<deque<long long>> temp;
		long long temp_max = 0;
		array<float, 3> load_avg;
	};

	//* Collect cpu stats and temperatures
    auto collect(bool no_update = false) -> cpu_info&;

	//* Draw contents of cpu box using <cpu> as source
    string draw(const cpu_info& cpu, bool force_redraw = false, bool data_same = false);

	//* Parse /proc/cpu info for mapping of core ids
	auto get_core_mapping() -> unordered_flat_map<int, int>;
	extern unordered_flat_map<int, int> core_mapping;

	//* Get battery info from /sys
	auto get_battery() -> tuple<int, long, string>;
}

namespace Mem {
	extern string box;
	extern int x, y, width, height, min_width, min_height;
	extern bool has_swap, shown, redraw;
    const array mem_names { "used"s, "available"s, "cached"s, "free"s };
    const array swap_names { "swap_used"s, "swap_free"s };
	extern int disk_ios;

	struct disk_info {
		std::filesystem::path dev;
		string name;
        string fstype{};                // defaults to ""
        std::filesystem::path stat{};   // defaults to ""
        int64_t total{};                // defaults to 0
        int64_t used{};                 // defaults to 0
        int64_t free{};                 // defaults to 0
        int used_percent{};             // defaults to 0
        int free_percent{};             // defaults to 0

		array<int64_t, 3> old_io = {0, 0, 0};
		deque<long long> io_read = {};
		deque<long long> io_write = {};
		deque<long long> io_activity = {};
	};

	struct mem_info {
		unordered_flat_map<string, uint64_t> stats =
			{{"used", 0}, {"available", 0}, {"cached", 0}, {"free", 0},
			{"swap_total", 0}, {"swap_used", 0}, {"swap_free", 0}};
		unordered_flat_map<string, deque<long long>> percent =
			{{"used", {}}, {"available", {}}, {"cached", {}}, {"free", {}},
			{"swap_total", {}}, {"swap_used", {}}, {"swap_free", {}}};
		unordered_flat_map<string, disk_info> disks;
		vector<string> disks_order;
	};

	//?* Get total system memory
	uint64_t get_totalMem();

	//* Collect mem & disks stats
    auto collect(bool no_update = false) -> mem_info&;

	//* Draw contents of mem box using <mem> as source
    string draw(const mem_info& mem, bool force_redraw = false, bool data_same = false);

}

namespace Net {
	extern string box;
	extern int x, y, width, height, min_width, min_height;
	extern bool shown, redraw;
	extern string selected_iface;
	extern vector<string> interfaces;
	extern bool rescale;
	extern unordered_flat_map<string, uint64_t> graph_max;

	struct net_stat {
        uint64_t speed{};       // defaults to 0
        uint64_t top{};         // defaults to 0
        uint64_t total{};       // defaults to 0
        uint64_t last{};        // defaults to 0
        uint64_t offset{};      // defaults to 0
        uint64_t rollover{};    // defaults to 0
	};

	struct net_info {
		unordered_flat_map<string, deque<long long>> bandwidth = { {"download", {}}, {"upload", {}} };
		unordered_flat_map<string, net_stat> stat = { {"download", {}}, {"upload", {}} };
        string ipv4{};      // defaults to ""
        string ipv6{};      // defaults to ""
        bool connected{};   // defaults to false
	};

	extern unordered_flat_map<string, net_info> current_net;

	//* Collect net upload/download stats
    auto collect(bool no_update=false) -> net_info&;

	//* Draw contents of net box using <net> as source
    string draw(const net_info& net, bool force_redraw = false, bool data_same = false);
}

namespace Proc {
	extern atomic<int> numpids;

	extern string box;
	extern int x, y, width, height, min_width, min_height;
	extern bool shown, redraw;
	extern int select_max;
	extern atomic<int> detailed_pid;
	extern int selected_pid, start, selected, collapse, expand, filter_found, selected_depth;
	extern string selected_name;

	//? Contains the valid sorting options for processes
	const vector<string> sort_vector = {
		"pid",
		"name",
		"command",
		"threads",
		"user",
		"memory",
		"cpu direct",
		"cpu lazy",
	};

	//? Translation from process state char to explanative string
	const unordered_flat_map<char, string> proc_states = {
		{'R', "Running"},
		{'S', "Sleeping"},
		{'D', "Waiting"},
		{'Z', "Zombie"},
		{'T', "Stopped"},
		{'t', "Tracing"},
		{'X', "Dead"},
		{'x', "Dead"},
		{'K', "Wakekill"},
		{'W', "Unknown"},
		{'P', "Parked"}
	};

	//* Container for process information
	struct proc_info {
        size_t pid{};           // defaults to 0
        string name{};          // defaults to ""
        string cmd{};           // defaults to ""
        string short_cmd{};     // defaults to ""
        size_t threads{};       // defaults to 0
        int name_offset{};      // defaults to 0
        string user{};          // defaults to ""
        uint64_t mem{};         // defaults to 0
        double cpu_p{};         // defaults to = 0.0
        double cpu_c{};         // defaults to = 0.0
		char state = '0';
        int64_t p_nice{};      // defaults to 0
        uint64_t ppid{};        // defaults to 0
        uint64_t cpu_s{};       // defaults to 0
        uint64_t cpu_t{};       // defaults to 0
        string prefix{};        // defaults to ""
        size_t depth{};         // defaults to 0
        size_t tree_index{};    // defaults to 0
        bool collapsed{};       // defaults to false
        bool filtered{};        // defaults to false
	};

	//* Container for process info box
	struct detail_container {
        size_t last_pid{}; // defaults to 0
        bool skip_smaps{}; // defaults to false
		proc_info entry;
		string elapsed, parent, status, io_read, io_write, memory;
		long long first_mem = -1;
		deque<long long> cpu_percent;
		deque<long long> mem_bytes;
	};

	//? Contains all info for proc detailed box
	extern detail_container detailed;

	//* Collect and sort process information from /proc
    auto collect(bool no_update = false) -> vector<proc_info>&;

	//* Update current selection and view, returns -1 if no change otherwise the current selection
	int selection(const string& cmd_key);

	//* Draw contents of proc box using <plist> as data source
    string draw(const vector<proc_info>& plist, bool force_redraw = false, bool data_same = false);

	struct tree_proc {
		std::reference_wrapper<proc_info> entry;
		vector<tree_proc> children;
	};

	//* Sort vector of proc_info's
    void proc_sorter(vector<proc_info>& proc_vec, const string& sorting, bool reverse, bool tree = false);

	//* Recursive sort of process tree
    void tree_sort(vector<tree_proc>& proc_vec, const string& sorting,
                   bool reverse, int& c_index, const int index_max, bool collapsed = false);

	//* Generate process tree list
    void _tree_gen(proc_info& cur_proc, vector<proc_info>& in_procs, vector<tree_proc>& out_procs,
                   int cur_depth, bool collapsed, const string& filter,
                   bool found = false, bool no_update = false, bool should_filter = false);
}
