package main

import (
	"fmt"
	"strings"
	"time"

	timertxt "git.bullercodeworks.com/brian/go-timertxt"
)

// If we have an active timer in timer.txt, return the most recent one
// Otherwise, check if we have a more recent completed timer in done.txt
// Return the most recent done from timer.txt or dont.txt
func (a *AppState) getMostRecentTimer() (*timertxt.Timer, error) {
	work, wErr := a.TimerList.GetMostRecentTimer()
	if wErr == nil && work.FinishDate.IsZero() {
		return work, nil
	}

	if err := a.LoadDoneList(); err != nil {
		return nil, err
	}
	done, dErr := a.DoneList.GetMostRecentTimer()
	if dErr != nil {
		return nil, dErr
	}
	if !done.FinishDate.IsZero() && work == nil || done.FinishDate.After(work.FinishDate) {
		return done, nil
	}
	return work, nil
}

func (a *AppState) getFilteredTimerList(args []string) *timertxt.TimerList {
	var includeArchive bool
	var err error
	start := time.Time{}
	end := time.Now()
	var contextFilters []string
	var projectFilters []string

	var allFilters []func(timertxt.Timer) bool

	if len(args) > 0 {
		contextFilters, args = getContextsFromSlice(args)
		projectFilters, args = getProjectsFromSlice(args)
	}
	if len(args) > 0 {
		if args[0] == "--a" {
			includeArchive = true
			args = args[1:]
		}
	}
	if len(args) > 0 {
		if start, err = parseFuzzyTime(args[0]); err != nil {
			y, m, d := time.Now().Date()
			start = time.Date(y, m, d, 0, 0, 0, 0, time.Now().Location())
		} else {
			args = args[1:]
		}
		if len(args) > 0 {
			if end, err = parseFuzzyTime(args[0]); err != nil {
				y, m, d := time.Now().Date()
				end = time.Date(y, m, d, 23, 59, 59, 0, time.Now().Location())
			} else {
				args = args[1:]
			}
		}
	}
	list := a.TimerList.GetTimersInRange(start, end)

	if includeArchive {
		if err = a.LoadDoneList(); err != nil {
			fmt.Println("Error loading done.txt entries")
			fmt.Println(err.Error())
			return nil
		}
		*list = append(*list, (*a.DoneList.GetTimersInRange(start, end))...)
	}
	if len(contextFilters) > 0 {
		allFilters = append(allFilters, func(t timertxt.Timer) bool {
			for _, v := range contextFilters {
				v = strings.TrimPrefix(v, "@")
				if !t.HasContext(v) {
					return false
				}
			}
			return true
		})
	}
	if len(projectFilters) > 0 {
		allFilters = append(allFilters, func(t timertxt.Timer) bool {
			for _, v := range projectFilters {
				v = strings.TrimPrefix(v, "+")
				if !t.HasProject(v) {
					return false
				}
			}
			return true
		})
	}
	doFilters := func(t *timertxt.Timer) bool {
		for _, v := range allFilters {
			if !v(*t) {
				return false
			}
		}
		// If we made it all the way down here, it matches
		return true
	}
	return list.Filter(doFilters)
}

func (a *AppState) SetTimerFinished(id int, end time.Time) error {
	var t *timertxt.Timer
	var err error
	if t, err = a.TimerList.GetTimer(id); err != nil {
		return err
	}
	t.FinishDate = end
	t.Finished = true
	return nil
}

func (a *AppState) addTimer(timerString string) error {
	t, err := timertxt.ParseTimer(timerString)
	if err != nil {
		return err
	}
	if t.StartDate.IsZero() {
		t.StartDate = time.Now()
	}
	a.TimerList.AddTimer(t)
	return a.WriteList()
}

func (a *AppState) archiveTimer(id int) error {
	var err error
	var timer *timertxt.Timer
	if timer, err = a.TimerList.GetTimer(id); err != nil {
		return err
	}
	if err := a.TimerList.ArchiveTimerToFile(*timer, app.getDoneFile()); err != nil {
		return err
	}
	a.TimerList.RemoveTimer(*timer)
	return a.WriteList()
}

func (a *AppState) unarchiveTimer(id int) error {
	var err error
	var timer *timertxt.Timer
	if timer, err = a.DoneList.GetTimer(id); err != nil {
		return err
	}
	a.TimerList.AddTimer(timer)
	if err = a.WriteList(); err != nil {
		return err
	}
	a.DoneList.RemoveTimer(*timer)
	return a.WriteDoneList()
}

func (a *AppState) LoadTimerList() error {
	var err error
	var tl timertxt.TimerList
	tl, err = timertxt.LoadFromFilename(a.getTimerFile())
	tl.Sort(timertxt.SORT_UNFINISHED_START)
	a.TimerList = &tl
	return err
}

func (a *AppState) WriteList() error {
	return a.TimerList.WriteToFilename(a.getTimerFile())
}

func (a *AppState) LoadDoneList() error {
	var err error
	var tl timertxt.TimerList
	tl, err = timertxt.LoadFromFilename(a.getDoneFile())
	a.DoneList = &tl
	return err
}

func (a *AppState) WriteDoneList() error {
	return a.DoneList.WriteToFilename(a.getDoneFile())
}

func (a *AppState) getFilterPredicate(filter string) func(*timertxt.Timer) bool {
	var predicates []func(*timertxt.Timer) bool
	// If none of the 'filter' is in upper-case, do a case-insensitive filter
	checkCase := true
	if strings.ToLower(filter) == filter {
		checkCase = false
	}
	filterParts := strings.Split(filter, " ")
	for _, part := range filterParts {
		if strings.HasPrefix(part, "@") {
			predicates = append(predicates, func(t *timertxt.Timer) bool {
				for _, v := range t.Contexts {
					if "@"+v == part {
						return true
					}
				}
				return false
			})
		} else if strings.HasPrefix(part, "+") {
			predicates = append(predicates, func(t *timertxt.Timer) bool {
				for _, v := range t.Projects {
					if "+"+v == part {
						return true
					}
				}
				return false
			})
		} else {
			predicates = append(predicates, func(t *timertxt.Timer) bool {
				val := t.Original
				if !checkCase {
					val = strings.ToLower(t.Original)
				}
				return strings.Contains(val, part)
			})
		}
	}
	return func(t *timertxt.Timer) bool {
		for _, v := range predicates {
			if v(t) {
				return true
			}
		}
		return false
	}
}