package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"code.gitea.io/sdk/gitea"
)

type TimesheetItem struct {
	Date          string  `json:"date"`
	TaskID        int64   `json:"task_id"`
	GiteaUsername string  `json:"gitea_username"`
	Description   string  `json:"description"`
	HourSpent     float64 `json:"hour_spent"`
}

// parseOdooTicketID extracts numeric id from a ref segment like "ticket-<number>"
func parseOdooTicketID(ref string) (int64, error) {
	ref = strings.TrimSpace(ref)
	if ref == "" {
		return 0, fmt.Errorf("empty ref")
	}
	parts := strings.Split(ref, "/")
	for _, seg := range parts {
		if seg == "" {
			continue
		}
		lower := strings.ToLower(seg)
		const pfx = "ticket-"
		if strings.HasPrefix(lower, pfx) {
			numPart := seg[len(pfx):]
			var digits strings.Builder
			for _, r := range numPart {
				if r >= '0' && r <= '9' {
					digits.WriteRune(r)
				} else {
					break
				}
			}
			if digits.Len() == 0 {
				return 0, fmt.Errorf("no digits after ticket- in segment: %s", seg)
			}
			id, err := strconv.ParseInt(digits.String(), 10, 64)
			if err != nil {
				return 0, err
			}
			return id, nil
		}
	}
	return 0, fmt.Errorf("no ticket- segment found")
}

// weekRangeMonSat returns [since, before) covering Monday 00:00 to Sunday 00:00 for the current week
func weekRangeMonSat(now time.Time) (time.Time, time.Time) {
	loc := now.Location()
	t := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, loc)
	// 0=Sunday..6=Saturday
	weekday := int(t.Weekday())
	daysSinceMonday := (weekday + 6) % 7
	// Monday=0, Sunday=6
	monday := t.AddDate(0, 0, -daysSinceMonday)
	// Sunday 00:00 (Mon + 6 days)
	before := monday.AddDate(0, 0, 6)
	return monday, before
}

func main() {
	// Logger
	logFile, err := os.OpenFile("action.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
	if err != nil {
		fmt.Printf("Error creating log file: %v\n", err)
		os.Exit(1)
	}
	defer logFile.Close()
	logger := log.New(io.MultiWriter(os.Stdout, logFile), "", log.LstdFlags)

	giteaBaseUrl := os.Getenv("GITEA_BASE_URL")
	fastApiBaseUrl := os.Getenv("FASTAPI_BASE_URL")
	fastApiToken := os.Getenv("FASTAPI_TOKEN")
	token := os.Getenv("GITEA_TOKEN")
	owner := os.Getenv("REPO_OWNER")
	repo := os.Getenv("REPO_NAME")

	if strings.TrimSpace(giteaBaseUrl) == "" || owner == "" || repo == "" || token == "" {
		logger.Println("Missing required env vars: GITEA_BASE_URL, REPO_OWNER, REPO_NAME, or GITEA_TOKEN")
		os.Exit(1)
	}

	// Gitea client
	giteaAPIURL := os.Getenv("GITEA_API_BASE_URL")
	if strings.TrimSpace(giteaAPIURL) == "" {
		giteaAPIURL = "https://gitea.ethumada.com"
	}
	client, err := gitea.NewClient(giteaAPIURL, gitea.SetToken(token))
	if err != nil {
		logger.Printf("Failed to create Gitea client: %v\n", err)
		os.Exit(1)
	}

	// Compute current week's Monday..Saturday window
	since, before := weekRangeMonSat(time.Now())
	logger.Printf("Fetching tracked times from %s to %s (UTC+3)\n", since.Format(time.RFC3339), before.Format(time.RFC3339))

	// Fetch all tracked times for the repository
	opt := gitea.ListTrackedTimesOptions{
		ListOptions: gitea.ListOptions{Page: -1, PageSize: 1000},
		Since:       since,
		Before:      before,
	}
	tracked, _, err := client.ListRepoTrackedTimes(owner, repo, opt)
	if err != nil {
		logger.Printf("ListRepoTrackedTimes failed: %v\n", err)
		os.Exit(1)
	}

	items := make([]TimesheetItem, 0, len(tracked))
	for _, tt := range tracked {
		if tt.Issue == nil {
			logger.Printf("Skipping tracked time %d: no issue attached\n", tt.ID)
			continue
		}

		var taskID int64
		if tt.Issue.Ref != "" {
			if id, err := parseOdooTicketID(tt.Issue.Ref); err == nil {
				taskID = id
			} else {
				// Fallback to issue number if ref not properly formatted
				taskID = tt.Issue.Index
			}
		} else {
			// Fallback to issue number if ref is empty
			taskID = tt.Issue.Index
		}

		dateStr := tt.Created.UTC().Format("2006-01-02")
		items = append(items, TimesheetItem{
			Date:          dateStr,
			TaskID:        taskID,
			GiteaUsername: tt.UserName,
			Description:   "/",
			HourSpent:     float64(tt.Time) / 3600.0,
		})
	}

	if len(items) == 0 {
		logger.Println("No tracked times found for the specified window. Nothing to send.")
		return
	}

	body, err := json.Marshal(items)
	if err != nil {
		logger.Printf("Failed to marshal payload: %v\n", err)
		os.Exit(1)
	}

	endpoint := strings.TrimRight(fastApiBaseUrl, "/") + "/api/v1/account_analytic_gitea_odoo"
	req, err := http.NewRequest(http.MethodPost, endpoint, bytes.NewReader(body))
	if err != nil {
		logger.Printf("Failed to create request: %v\n", err)
		os.Exit(1)
	}
	req.Header.Set("Content-Type", "application/json")
	if strings.TrimSpace(fastApiToken) != "" {
		req.Header.Set("Authorization", "Bearer "+fastApiToken)
	} else {
		logger.Println("FASTAPI_TOKEN not provided; sending request without Authorization header")
	}

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		logger.Printf("HTTP request failed: %v\n", err)
		os.Exit(1)
	}
	defer resp.Body.Close()
	respBody, _ := io.ReadAll(resp.Body)
	logger.Printf("FastAPI status: %s\nResponse: %s\n", resp.Status, string(respBody))
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		os.Exit(1)
	}
}