/* Package fzf implements fzf, a command-line fuzzy finder.

The MIT License (MIT)

Copyright © 2013-2021 Junegunn Choi

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package fzf

import (

"fmt"
"os"
"time"

"github.com/junegunn/fzf/src/util"

)

/* Reader -> EvtReadFin Reader -> EvtReadNew -> Matcher (restart) Terminal -> EvtSearchNew:bool -> Matcher (restart) Matcher -> EvtSearchProgress -> Terminal (update info) Matcher -> EvtSearchFin -> Terminal (update list) Matcher -> EvtHeader -> Terminal (update header) */

// Run starts fzf func Run(opts *Options, version string, revision string) {

sort := opts.Sort > 0
sortCriteria = opts.Criteria

if opts.Version {
        if len(revision) > 0 {
                fmt.Printf("%s (%s)\n", version, revision)
        } else {
                fmt.Println(version)
        }
        os.Exit(exitOk)
}

// Event channel
eventBox := util.NewEventBox()

// ANSI code processor
ansiProcessor := func(data []byte) (util.Chars, *[]ansiOffset) {
        return util.ToChars(data), nil
}

var lineAnsiState, prevLineAnsiState *ansiState
if opts.Ansi {
        if opts.Theme.Colored {
                ansiProcessor = func(data []byte) (util.Chars, *[]ansiOffset) {
                        prevLineAnsiState = lineAnsiState
                        trimmed, offsets, newState := extractColor(string(data), lineAnsiState, nil)
                        lineAnsiState = newState
                        return util.ToChars([]byte(trimmed)), offsets
                }
        } else {
                // When color is disabled but ansi option is given,
                // we simply strip out ANSI codes from the input
                ansiProcessor = func(data []byte) (util.Chars, *[]ansiOffset) {
                        trimmed, _, _ := extractColor(string(data), nil, nil)
                        return util.ToChars([]byte(trimmed)), nil
                }
        }
}

// Chunk list
var chunkList *ChunkList
var itemIndex int32
header := make([]string, 0, opts.HeaderLines)
if len(opts.WithNth) == 0 {
        chunkList = NewChunkList(func(item *Item, data []byte) bool {
                if len(header) < opts.HeaderLines {
                        header = append(header, string(data))
                        eventBox.Set(EvtHeader, header)
                        return false
                }
                item.text, item.colors = ansiProcessor(data)
                item.text.Index = itemIndex
                itemIndex++
                return true
        })
} else {
        chunkList = NewChunkList(func(item *Item, data []byte) bool {
                tokens := Tokenize(string(data), opts.Delimiter)
                if opts.Ansi && opts.Theme.Colored && len(tokens) > 1 {
                        var ansiState *ansiState
                        if prevLineAnsiState != nil {
                                ansiStateDup := *prevLineAnsiState
                                ansiState = &ansiStateDup
                        }
                        for _, token := range tokens {
                                prevAnsiState := ansiState
                                _, _, ansiState = extractColor(token.text.ToString(), ansiState, nil)
                                if prevAnsiState != nil {
                                        token.text.Prepend("\x1b[m" + prevAnsiState.ToString())
                                } else {
                                        token.text.Prepend("\x1b[m")
                                }
                        }
                }
                trans := Transform(tokens, opts.WithNth)
                transformed := joinTokens(trans)
                if len(header) < opts.HeaderLines {
                        header = append(header, transformed)
                        eventBox.Set(EvtHeader, header)
                        return false
                }
                item.text, item.colors = ansiProcessor([]byte(transformed))
                item.text.TrimTrailingWhitespaces()
                item.text.Index = itemIndex
                item.origText = &data
                itemIndex++
                return true
        })
}

// Reader
streamingFilter := opts.Filter != nil && !sort && !opts.Tac && !opts.Sync
var reader *Reader
if !streamingFilter {
        reader = NewReader(func(data []byte) bool {
                return chunkList.Push(data)
        }, eventBox, opts.ReadZero, opts.Filter == nil)
        go reader.ReadSource()
}

// Matcher
forward := true
for _, cri := range opts.Criteria[1:] {
        if cri == byEnd {
                forward = false
                break
        }
        if cri == byBegin {
                break
        }
}
patternBuilder := func(runes []rune) *Pattern {
        return BuildPattern(
                opts.Fuzzy, opts.FuzzyAlgo, opts.Extended, opts.Case, opts.Normalize, forward,
                opts.Filter == nil, opts.Nth, opts.Delimiter, runes)
}
matcher := NewMatcher(patternBuilder, sort, opts.Tac, eventBox)

// Filtering mode
if opts.Filter != nil {
        if opts.PrintQuery {
                opts.Printer(*opts.Filter)
        }

        pattern := patternBuilder([]rune(*opts.Filter))
        matcher.sort = pattern.sortable

        found := false
        if streamingFilter {
                slab := util.MakeSlab(slab16Size, slab32Size)
                reader := NewReader(
                        func(runes []byte) bool {
                                item := Item{}
                                if chunkList.trans(&item, runes) {
                                        if result, _, _ := pattern.MatchItem(&item, false, slab); result != nil {
                                                opts.Printer(item.text.ToString())
                                                found = true
                                        }
                                }
                                return false
                        }, eventBox, opts.ReadZero, false)
                reader.ReadSource()
        } else {
                eventBox.Unwatch(EvtReadNew)
                eventBox.WaitFor(EvtReadFin)

                snapshot, _ := chunkList.Snapshot()
                merger, _ := matcher.scan(MatchRequest{
                        chunks:  snapshot,
                        pattern: pattern})
                for i := 0; i < merger.Length(); i++ {
                        opts.Printer(merger.Get(i).item.AsString(opts.Ansi))
                        found = true
                }
        }
        if found {
                os.Exit(exitOk)
        }
        os.Exit(exitNoMatch)
}

// Synchronous search
if opts.Sync {
        eventBox.Unwatch(EvtReadNew)
        eventBox.WaitFor(EvtReadFin)
}

// Go interactive
go matcher.Loop()

// Terminal I/O
terminal := NewTerminal(opts, eventBox)
deferred := opts.Select1 || opts.Exit0
go terminal.Loop()
if !deferred {
        terminal.startChan <- true
}

// Event coordination
reading := true
clearCache := util.Once(false)
clearSelection := util.Once(false)
ticks := 0
var nextCommand *string
restart := func(command string) {
        reading = true
        clearCache = util.Once(true)
        clearSelection = util.Once(true)
        chunkList.Clear()
        itemIndex = 0
        header = make([]string, 0, opts.HeaderLines)
        go reader.restart(command)
}
eventBox.Watch(EvtReadNew)
query := []rune{}
for {
        delay := true
        ticks++
        input := func() []rune {
                paused, input := terminal.Input()
                if !paused {
                        query = input
                }
                return query
        }
        eventBox.Wait(func(events *util.Events) {
                if _, fin := (*events)[EvtReadFin]; fin {
                        delete(*events, EvtReadNew)
                }
                for evt, value := range *events {
                        switch evt {
                        case EvtQuit:
                                if reading {
                                        reader.terminate()
                                }
                                os.Exit(value.(int))
                        case EvtReadNew, EvtReadFin:
                                if evt == EvtReadFin && nextCommand != nil {
                                        restart(*nextCommand)
                                        nextCommand = nil
                                        break
                                } else {
                                        reading = reading && evt == EvtReadNew
                                }
                                snapshot, count := chunkList.Snapshot()
                                terminal.UpdateCount(count, !reading, value.(*string))
                                if opts.Sync {
                                        opts.Sync = false
                                        terminal.UpdateList(PassMerger(&snapshot, opts.Tac), false)
                                }
                                matcher.Reset(snapshot, input(), false, !reading, sort, clearCache())

                        case EvtSearchNew:
                                var command *string
                                switch val := value.(type) {
                                case searchRequest:
                                        sort = val.sort
                                        command = val.command
                                }
                                if command != nil {
                                        if reading {
                                                reader.terminate()
                                                nextCommand = command
                                        } else {
                                                restart(*command)
                                        }
                                        break
                                }
                                snapshot, _ := chunkList.Snapshot()
                                matcher.Reset(snapshot, input(), true, !reading, sort, clearCache())
                                delay = false

                        case EvtSearchProgress:
                                switch val := value.(type) {
                                case float32:
                                        terminal.UpdateProgress(val)
                                }

                        case EvtHeader:
                                headerPadded := make([]string, opts.HeaderLines)
                                copy(headerPadded, value.([]string))
                                terminal.UpdateHeader(headerPadded)

                        case EvtSearchFin:
                                switch val := value.(type) {
                                case *Merger:
                                        if deferred {
                                                count := val.Length()
                                                if opts.Select1 && count > 1 || opts.Exit0 && !opts.Select1 && count > 0 {
                                                        deferred = false
                                                        terminal.startChan <- true
                                                } else if val.final {
                                                        if opts.Exit0 && count == 0 || opts.Select1 && count == 1 {
                                                                if opts.PrintQuery {
                                                                        opts.Printer(opts.Query)
                                                                }
                                                                if len(opts.Expect) > 0 {
                                                                        opts.Printer("")
                                                                }
                                                                for i := 0; i < count; i++ {
                                                                        opts.Printer(val.Get(i).item.AsString(opts.Ansi))
                                                                }
                                                                if count > 0 {
                                                                        os.Exit(exitOk)
                                                                }
                                                                os.Exit(exitNoMatch)
                                                        }
                                                        deferred = false
                                                        terminal.startChan <- true
                                                }
                                        }
                                        terminal.UpdateList(val, clearSelection())
                                }
                        }
                }
                events.Clear()
        })
        if delay && reading {
                dur := util.DurWithin(
                        time.Duration(ticks)*coordinatorDelayStep,
                        0, coordinatorDelayMax)
                time.Sleep(dur)
        }
}

}