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package vikunja

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/url"
	neturl "net/url"
	"strings"
)

type Client struct {
	token string
	url   string
}

func New(url, token string) (*Client, error) {
	u, err := neturl.Parse(url)
	if err != nil {
		return nil, err
	}
	u.Path = strings.TrimSuffix(u.Path, "/") + "/api/v1"
	return &Client{
		token: token,
		url:   u.String(),
	}, nil
}

func (c *Client) newRequest(method, url string, body io.Reader) (*http.Request, error) {
	req, err := http.NewRequest(method, url, body)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.token))
	return req, nil
}

func (c *Client) Projects() ([]Project, error) {
	req, err := c.newRequest(http.MethodGet, c.url+"/projects", nil)
	if err != nil {
		return nil, err
	}
	req.URL.RawQuery = url.Values{
		"page": []string{"1"},
	}.Encode()
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	var projects []Project
	if err := json.NewDecoder(resp.Body).Decode(&projects); err != nil {
		return nil, err
	}
	return projects, nil
}

func (c *Client) Tasks() ([]Task, error) {
	req, err := c.newRequest(http.MethodGet, c.url+"/tasks/all", nil)
	if err != nil {
		return nil, err
	}
	req.URL.RawQuery = url.Values{
		"page":   []string{"1"},
		"filter": []string{"done = false"},
	}.Encode()
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	var tasks []Task
	if err := json.NewDecoder(resp.Body).Decode(&tasks); err != nil {
		return nil, err
	}
	return tasks, nil
}

func (c *Client) AddTask(project int, title string) error {
	payload, err := json.Marshal(NewTask{
		Title: title,
	})
	if err != nil {
		return err
	}
	req, err := c.newRequest(http.MethodPut, c.url+fmt.Sprintf("/projects/%d/tasks", project), bytes.NewBuffer(payload))
	if err != nil {
		return err
	}
	req.Header.Add("Content-Type", "application/json")
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != 201 {
		body, err := io.ReadAll(resp.Body)
		if err == nil {
			return errors.New(string(body))
		}
		return errors.New(resp.Status)
	}
	return nil
}

func (c *Client) FinishTask(task int) error {
	payload, err := json.Marshal(FinishTask{
		Done: true,
	})
	if err != nil {
		return err
	}
	req, err := c.newRequest(http.MethodPost, c.url+fmt.Sprintf("/tasks/%d", task), bytes.NewBuffer(payload))
	if err != nil {
		return err
	}
	req.Header.Add("Content-Type", "application/json")
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != 200 {
		body, err := io.ReadAll(resp.Body)
		if err == nil {
			return errors.New(string(body))
		}
		return errors.New(resp.Status)
	}
	return nil
}