package broker

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"local/storage"
	"local/truckstop/config"
	"net/http"
	"strings"
)

type FastExact struct {
	doer interface {
		doRequest(*http.Request) (*http.Response, error)
	}
}

func NewFastExact() FastExact {
	fe := FastExact{}
	fe.doer = fe
	return fe
}

func (fe FastExact) WithMock() FastExact {
	fe.doer = mockFastExactDoer{}
	return fe
}

func (fe FastExact) Search(states []config.State) ([]Job, error) {
	jobs, err := fe.search(states)
	if err == ErrNoAuth {
		if err := fe.login(); err != nil {
			return nil, err
		}
		jobs, err = fe.search(states)
	}
	return jobs, err
}

func (fe FastExact) login() error {
	conf := config.Get()
	return fe._login(conf.Brokers.FastExact.Username, conf.Brokers.FastExact.Password, conf.DB())
}

func (fe FastExact) _login(username, password string, db storage.DB) error {
	req, err := http.NewRequest(
		http.MethodPost,
		`https://www.fastexact.com/secure/index.php?page=userLogin`,
		strings.NewReader(fmt.Sprintf(
			`user_name=%s&user_password=%s&buttonSubmit=Login`,
			username,
			password,
		)),
	)
	if err != nil {
		return err
	}
	fe.setHeaders(req)

	db.Set("cookies_"+req.URL.Host, nil)
	resp, err := fe.doer.doRequest(req)
	if err != nil {
		return err
	}
	b, _ := ioutil.ReadAll(resp.Body)
	resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("bad status logging into fast exact: %d: %s", resp.StatusCode, b)
	}
	return nil
}

func (fe FastExact) setHeaders(req *http.Request) {
	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0")
	req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8")
	req.Header.Set("Accept-Language", "en-US,en;q=0.5")
	req.Header.Set("Accept-Encoding", "gzip, deflate, br")
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
}

func (fe FastExact) search(states []config.State) ([]Job, error) {
	var result []Job
	for _, state := range states {
		jobs, err := fe.searchOne(state)
		if err != nil {
			return nil, err
		}
		result = append(result, jobs...)
	}
	return result, nil
}

func (fe FastExact) searchOne(state config.State) ([]Job, error) {
	req, err := fe.newRequest(state)
	if err != nil {
		return nil, err
	}
	resp, err := fe.doer.doRequest(req)
	if err != nil {
		return nil, err
	}
	return fe.parse(resp)
}

func (fe FastExact) newRequest(state config.State) (*http.Request, error) {
	zip, ok := config.States[state]
	if !ok {
		return nil, fmt.Errorf("no configured zip for %s", state)
	}
	req, err := http.NewRequest(
		http.MethodGet,
		"https://www.fastexact.com/secure/index.php?page=ajaxListJobs&action=ajax&zipcode="+zip+"&records_per_page=50&distance=300&st_loc_zip=8",
		nil,
	)
	if err != nil {
		return nil, err
	}
	fe.setHeaders(req)
	return req, nil
}

func (fe FastExact) doRequest(req *http.Request) (*http.Response, error) {
	return nil, errors.New("not impl: fe.doreq")
}

func (fe FastExact) parse(resp *http.Response) ([]Job, error) {
	return nil, errors.New("not impl: fe.parse")
}

type mockFastExactDoer struct{}

func (mock mockFastExactDoer) doRequest(req *http.Request) (*http.Response, error) {
	if req.URL.Path != "/secure/index.php" {
		return nil, errors.New("bad path")
	}
	switch req.URL.Query().Get("page") {
	case "userLogin":
		if b, _ := ioutil.ReadAll(req.Body); !bytes.Equal(b, []byte(`user_name=u&user_password=p&buttonSubmit=Login`)) {
			return nil, errors.New("bad req body")
		}
		return &http.Response{
			Status:     http.StatusText(http.StatusOK),
			StatusCode: http.StatusOK,
			Header:     http.Header{"Set-Cookie": []string{"PHPSESSID=SessionFromLogin; path=/"}},
			Body:       io.NopCloser(bytes.NewReader([]byte{})),
		}, nil
	case "ajaxListJobs":
		if req.URL.Query().Get("action") != "ajax" {
			return nil, errors.New("bad query: action should be ajax")
		}
		if req.URL.Query().Get("records_per_page") != "50" {
			return nil, errors.New("bad query: records_per_page should be 50")
		}
		if req.URL.Query().Get("distance") != "300" {
			return nil, errors.New("bad query: distance should be 300")
		}
		if req.URL.Query().Get("zipcode") == "" {
			return nil, errors.New("bad query: zip code empty")
		}
		b, err := ioutil.ReadFile("./testdata/fastexact_search.xml")
		if err != nil {
			return nil, err
		}
		return &http.Response{
			Status:     http.StatusText(http.StatusOK),
			StatusCode: http.StatusOK,
			Header:     http.Header{"Set-Cookie": []string{"PHPSESSID=SessionFromSearch; path=/"}},
			Body:       io.NopCloser(bytes.NewReader(b)),
		}, nil
	}
	return nil, errors.New("bad query")
}