package result

import (
	"cpone-dashboard/menu/auth"
	"cpone-dashboard/menu/projects"
	"html/template"
	"net/http"
	"strconv"
)

var tmpl *template.Template
var pdfBaseURL string
var basePath string

const defaultPageSize = 30

func SetTemplates(t *template.Template) { tmpl = t }
func SetPDFBaseURL(u string)            { pdfBaseURL = u }
func SetBasePath(p string)              { basePath = p }

type pageData struct {
	Username       string
	CurrentProject projects.ProjectItem
	Search         string
	Filter         string
	Rows           []ResultRow
	FilteredRows   []ResultRow
	Summary        ResultSummary
	PDFBaseURL     string
	Page           int
	PageSize       int
	HasMore        bool
	VisibleCount   int
	TotalFiltered  int
	NextPage       int
}

func parsePage(q string) int {
	p, err := strconv.Atoi(q)
	if err != nil || p < 1 {
		return 1
	}
	return p
}

func buildResultData(r *http.Request) (pageData, int, error) {
	username := auth.Username(r)
	mcuID := auth.SelectedProjectID(r)
	if mcuID == 0 {
		return pageData{}, http.StatusSeeOther, nil
	}
	project, ok, err := projects.GetUserProject(username, mcuID)
	if err != nil {
		return pageData{}, http.StatusInternalServerError, err
	}
	if !ok {
		return pageData{}, http.StatusSeeOther, nil
	}

	rows, err := GetResultRows(mcuID)
	if err != nil {
		return pageData{}, http.StatusInternalServerError, err
	}

	summary := BuildResultSummary(rows)
	search := r.URL.Query().Get("search")
	filter := r.URL.Query().Get("filter")
	filteredRows := FilterResultRows(rows, search, filter)
	page := parsePage(r.URL.Query().Get("page"))
	pagedRows, hasMore := PaginateResultRows(filteredRows, page, defaultPageSize)
	visibleCount := page * defaultPageSize
	if visibleCount > len(filteredRows) {
		visibleCount = len(filteredRows)
	}

	return pageData{
		Username:       username,
		CurrentProject: project,
		Search:         search,
		Filter:         filter,
		Rows:           rows,
		FilteredRows:   pagedRows,
		Summary:        summary,
		PDFBaseURL:     pdfBaseURL,
		Page:           page,
		PageSize:       defaultPageSize,
		HasMore:        hasMore,
		VisibleCount:   visibleCount,
		TotalFiltered:  len(filteredRows),
		NextPage:       page + 1,
	}, http.StatusOK, nil
}

func Index(w http.ResponseWriter, r *http.Request) {
	t := tmpl
	if t == nil {
		http.Error(w, "template not ready", http.StatusInternalServerError)
		return
	}

	data, status, err := buildResultData(r)
	if err != nil {
		http.Error(w, "query error", status)
		return
	}
	if status == http.StatusSeeOther {
		http.Redirect(w, r, basePath+"/projects", http.StatusSeeOther)
		return
	}

	if err := t.ExecuteTemplate(w, "base", data); err != nil {
		http.Error(w, "template error", http.StatusInternalServerError)
	}
}

func List(w http.ResponseWriter, r *http.Request) {
	t := tmpl
	if t == nil {
		http.Error(w, "template not ready", http.StatusInternalServerError)
		return
	}
	data, status, err := buildResultData(r)
	if err != nil {
		http.Error(w, "query error", status)
		return
	}
	if status == http.StatusSeeOther {
		http.Error(w, "unauthorized", http.StatusUnauthorized)
		return
	}
	if err := t.ExecuteTemplate(w, "result-list-chunk", data); err != nil {
		http.Error(w, "template error", http.StatusInternalServerError)
	}
}