package main

import (
	"encoding/json"
	"fmt"
	"io"
	"math/rand"
	"net/http"
	"os"

	"gopkg.in/yaml.v2"
)

type PokemonInspectOutput struct {
	Name   string
	Height int
	Weight int
	Stats  map[string]int
	Types  []string
}

func commandHelp(p *PokedexConfig, a *string) error {
	fmt.Print("Pokedex CLI - available commands:\n\n")
	for _, v := range getCommands() {
		fmt.Printf("%s			%s\n", v.name, v.description)
	}
	fmt.Println()
	return nil
}

func commandExit(p *PokedexConfig, a *string) error {
	fmt.Println("Closing the Pokedex... Goodbye!")
	os.Exit(0)
	return nil
}

func commandMap(p *PokedexConfig, a *string) error {
	var baseUrl string
	if p.LocationData.Next == nil {
		baseUrl = "https://pokeapi.co/api/v2/location-area/"
	} else {
		baseUrl = *p.LocationData.Next
	}

	var body []byte

	if resp, exists := p.Cache.Get(baseUrl); exists {
		body = resp
	} else {
		client := &http.Client{}

		resp, err := client.Get(baseUrl)
		if err != nil {
			return fmt.Errorf("could not make request to Pokedex API! Err: %w", err)
		}

		body, err = io.ReadAll(resp.Body)
		defer resp.Body.Close()
		if resp.StatusCode > 299 {
			return fmt.Errorf("request returned non-200 code! Code: %v Body: %v", resp.StatusCode, body)
		}
		if err != nil {
			return fmt.Errorf("could not read request body! Err: %w", err)
		}
		p.Cache.Add(baseUrl, body)
	}

	if err := json.Unmarshal(body, &p.LocationData); err != nil {
		return fmt.Errorf("could not unmarshal response! Err: %w", err)
	}
	for _, location := range p.LocationData.Locations {
		fmt.Println(location["name"])
	}
	return nil
}

func commandMapb(p *PokedexConfig, a *string) error {
	var baseUrl string
	if p.LocationData.Previous == nil {
		fmt.Println("you're on the first page")
		return nil
	} else {
		baseUrl = *p.LocationData.Previous
	}
	var body []byte
	if resp, exists := p.Cache.Get(baseUrl); exists {
		body = resp
	} else {
		client := &http.Client{}

		resp, err := client.Get(baseUrl)
		if err != nil {
			return fmt.Errorf("could not make request to Pokedex API! Err: %w", err)
		}

		body, err = io.ReadAll(resp.Body)
		defer resp.Body.Close()
		if resp.StatusCode > 299 {
			return fmt.Errorf("request returned non-200 code! Code: %v Body: %v", resp.StatusCode, body)
		}
		if err != nil {
			return fmt.Errorf("could not read request body! Err: %w", err)
		}

		p.Cache.Add(baseUrl, body)
	}
	if err := json.Unmarshal(body, &p.LocationData); err != nil {
		return fmt.Errorf("could not unmarshal response! Err: %w", err)
	}
	for _, location := range p.LocationData.Locations {
		fmt.Println(location["name"])
	}
	return nil
}

func commandExplore(p *PokedexConfig, a *string) error {
	if *a == "" {
		return fmt.Errorf("you need to specify an area to explore")
	}
	baseUrl := "https://pokeapi.co/api/v2/location-area/" + *a + "/"
	body, exists := p.Cache.Get(baseUrl)
	if !exists {
		client := http.Client{}

		resp, err := client.Get(baseUrl)
		if err != nil {
			return fmt.Errorf("could not make request to Pokedex API! Err: %w", err)
		}

		body, err = io.ReadAll(resp.Body)
		defer resp.Body.Close()
		if resp.StatusCode > 299 {
			return fmt.Errorf("request returned non-200 code! Code: %v Body: %v", resp.StatusCode, body)
		}
		if err != nil {
			return fmt.Errorf("could not read request body! Err: %w", err)
		}
		p.Cache.Add(baseUrl, body)
	}
	if err := json.Unmarshal(body, &p.LocalPokemons); err != nil {
		return fmt.Errorf("could not unmarshal response! Err: %w", err)
	}

	for _, pokemon := range p.LocalPokemons.PokemonEncounters {
		fmt.Println(pokemon.PokemonSummary.Name)
	}

	return nil
}

func commandCatch(p *PokedexConfig, a *string) error {
	if *a == "" {
		return fmt.Errorf("you need to specify a Pokemon to catch")
	}
	var pokemonName string
	var baseUrl string
	for _, encounter := range p.LocalPokemons.PokemonEncounters {
		if encounter.PokemonSummary.Name == *a {
			pokemonName = *a
			baseUrl = encounter.PokemonSummary.DataUrl
		}
	}

	if pokemonName != *a {
		fmt.Println("this pokemon is not present in the current area")
		return nil
	}

	body, exists := p.Cache.Get(baseUrl)
	if !exists {
		client := http.Client{}

		resp, err := client.Get(baseUrl)
		if err != nil {
			return fmt.Errorf("could not make request to Pokedex API! Err: %w", err)
		}
		body, err = io.ReadAll(resp.Body)
		defer resp.Body.Close()
		if resp.StatusCode > 299 {
			return fmt.Errorf("request returned non-200 code! Code: %v Body: %v", resp.StatusCode, body)
		}
		if err != nil {
			return fmt.Errorf("could not read request body! Err: %w", err)
		}
		p.Cache.Add(baseUrl, body)
	}
	var pokemon PokemonDetails
	if err := json.Unmarshal(body, &pokemon); err != nil {
		return fmt.Errorf("could not unmarshal Pokemon data! err: %w", err)
	}
	fmt.Printf("Throwing a Pokeball at %s...\n", *a)
	catchSuccess := rand.Intn(pokemon.BaseExperience)
	if 2*catchSuccess >= pokemon.BaseExperience {
		fmt.Printf("%s was caught!\n", pokemon.Name)
		p.CaughtPokemon = append(p.CaughtPokemon, pokemon)
		return nil
	}
	fmt.Printf("%s escaped!\n", *a)

	return nil
}

func commandPokedex(p *PokedexConfig, a *string) error {
	if len(p.CaughtPokemon) == 0 {
		fmt.Println("Your Pokedex is empty.")
		return nil
	}
	fmt.Println("Your Pokedex:")
	for _, pokemon := range p.CaughtPokemon {
		fmt.Println(" - ", pokemon.Name)
	}

	return nil
}

func commandInspect(p *PokedexConfig, a *string) error {
	found := false
	for _, pokemon := range p.CaughtPokemon {
		if pokemon.Name == *a {
			found = true
			stats := map[string]int{}
			types := []string{}
			for _, pokeStat := range pokemon.PokeStats {
				stats[pokeStat.PokeStat.Name] = pokeStat.BaseStat
			}
			for _, pokeType := range pokemon.PokeTypes {
				types = append(types, pokeType.PokeType.Name)
			}
			pokemonInspectOutput := PokemonInspectOutput{
				Name:   pokemon.Name,
				Height: pokemon.Height,
				Weight: pokemon.Weight,
				Stats:  stats,
				Types:  types,
			}
			data, _ := yaml.Marshal(pokemonInspectOutput)
			fmt.Println(string(data))
		}
	}
	if !found {
		fmt.Println("you have not caught that pokemon")
	}
	return nil
}