# Copyright (C) 2009, 2010  Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os.path
import sys
rangerpath = os.path.join(os.path.dirname(__file__), '..')
if sys.path[1] != rangerpath:
	sys.path[1:1] = [rangerpath]

import unittest
import gc
from ranger.ext.signals import *

pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
package widgets

import (
	"fmt"
	"log"
	"math"

	"github.com/gdamore/tcell/v2"
	"github.com/mattn/go-runewidth"

	"git.sr.ht/~rjarry/aerc/config"
	"git.sr.ht/~rjarry/aerc/lib"
	"git.sr.ht/~rjarry/aerc/lib/format"
	"git.sr.ht/~rjarry/aerc/lib/ui"
	"git.sr.ht/~rjarry/aerc/models"
)

type MessageList struct {
	ui.Invalidatable
	conf          *config.AercConfig
	logger        *log.Logger
	height        int
	scroll        int
	nmsgs         int
	spinner       *Spinner
	store         *lib.MessageStore
	isInitalizing bool
	aerc          *Aerc
}

func NewMessageList(conf *config.AercConfig, logger *log.Logger, aerc *Aerc) *MessageList {
	ml := &MessageList{
		conf:          conf,
		logger:        logger,
		spinner:       NewSpinner(&conf.Ui),
		isInitalizing: true,
		aerc:          aerc,
	}
	ml.spinner.OnInvalidate(func(_ ui.Drawable) {
		ml.Invalidate()
	})
	// TODO: stop spinner, probably
	ml.spinner.Start()
	return ml
}

func (ml *MessageList) Invalidate() {
	ml.DoInvalidate(ml)
}

func (ml *MessageList) Draw(ctx *ui.Context) {
	ml.height = ctx.Height()
	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ',
		ml.aerc.SelectedAccount().UiConfig().GetStyle(config.STYLE_MSGLIST_DEFAULT))

	store := ml.Store()
	if store == nil {
		if ml.isInitalizing {
			ml.spinner.Draw(ctx)
			return
		} else {
			ml.spinner.Stop()
			ml.drawEmptyMessage(ctx)
			return
		}
	}

	ml.ensureScroll()

	needScrollbar := true
	percentVisible := float64(ctx.Height()) / float64(len(store.Uids()))
	if percentVisible >= 1.0 {
		needScrollbar = false
	}

	textWidth := ctx.Width()
	if needScrollbar {
		textWidth -= 1
	}
	if textWidth < 0 {
		textWidth = 0
	}

	var (
		needsHeaders []uint32
		row          int = 0
	)
	uids := store.Uids()

	for i := len(uids) - 1 - ml.scroll; i >= 0; i-- {
		uid := uids[i]
		msg := store.Messages[uid]

		if row >= ctx.Height() {
			break
		}

		if msg == nil {
			needsHeaders = append(needsHeaders, uid)
			ml.spinner.Draw(ctx.Subcontext(0, row, textWidth, 1))
			row += 1
			continue
		}

		confParams := map[config.ContextType]string{
			config.UI_CONTEXT_ACCOUNT: ml.aerc.SelectedAccount().AccountConfig().Name,
			config.UI_CONTEXT_FOLDER:  ml.aerc.SelectedAccount().Directories().Selected(),
		}
		if msg.Envelope != nil {
			confParams[config.UI_CONTEXT_SUBJECT] = msg.Envelope.Subject
		}
		uiConfig := ml.conf.GetUiConfig(confParams)

		msg_styles := []config.StyleObject{}
		// unread message
		seen := false
		flagged := false
		for _, flag := range msg.Flags {
			switch flag {
			case models.SeenFlag:
				seen = true
			case models.FlaggedFlag:
				flagged = true
			}
		}

		if seen {
			msg_styles = append(msg_styles, config.STYLE_MSGLIST_READ)
		} else {
			msg_styles = append(msg_styles, config.STYLE_MSGLIST_UNREAD)
		}

		if flagged {
			msg_styles = append(msg_styles, config.STYLE_MSGLIST_FLAGGED)
		}

		// deleted message
		if _, ok := store.Deleted[msg.Uid]; ok {
			msg_styles = append(msg_styles, config.STYLE_MSGLIST_DELETED)
		}

		// marked message
		if store.IsMarked(msg.Uid) {
			msg_styles = append(msg_styles, config.STYLE_MSGLIST_MARKED)
		}

		var style tcell.Style
		// current row
		if row == ml.store.SelectedIndex()-ml.scroll {
			style = uiConfig.GetComposedStyleSelected(config.STYLE_MSGLIST_DEFAULT, msg_styles)
		} else {
			style = uiConfig.GetComposedStyle(config.STYLE_MSGLIST_DEFAULT, msg_styles)
		}

		ctx.Fill(0, row, ctx.Width(), 1, ' ', style)
		fmtStr, args, err := format.ParseMessageFormat(
			uiConfig.IndexFormat, uiConfig.TimestampFormat,
			uiConfig.ThisDayTimeFormat, uiConfig.ThisYearTimeFormat,
			format.Ctx{
				FromAddress: ml.aerc.SelectedAccount().acct.From,
				AccountName: ml.aerc.SelectedAccount().Name(),
				MsgInfo:     msg,
				MsgNum:      i,
				MsgIsMarked: store.IsMarked(uid),
			})
		if err != nil {
			ctx.Printf(0, row, style, "%v", err)
		} else {
			line := fmt.Sprintf(fmtStr, args...)
			line = runewidth.Truncate(line, textWidth, "…")
			ctx.Printf(0, row, style, "%s", line)
		}

		row += 1
	}

	if needScrollbar {
		scrollbarCtx := ctx.Subcontext(ctx.Width()-1, 0, 1, ctx.Height())
		ml.drawScrollbar(scrollbarCtx, percentVisible)
	}

	if len(uids) == 0 {
		if store.Sorting {
			ml.spinner.Start()
			ml.spinner.Draw(ctx)
			return
		} else {
			ml.drawEmptyMessage(ctx)
		}
	}

	if len(needsHeaders) != 0 {
		store.FetchHeaders(needsHeaders, nil)
		ml.spinner.Start()
	} else {
		ml.spinner.Stop()
	}
}

func (ml *MessageList) drawScrollbar(ctx *ui.Context, percentVisible float64) {
	gutterStyle := tcell.StyleDefault
	pillStyle := tcell.StyleDefault.Reverse(true)

	// gutter
	ctx.Fill(0, 0, 1, ctx.Height(), ' ', gutterStyle)

	// pill
	pillSize := int(math.Ceil(float64(ctx.Height()) * percentVisible))
	percentScrolled := float64(ml.scroll) / float64(len(ml.Store().Uids()))
	pillOffset := int(math.Floor(float64(ctx.Height()) * percentScrolled))
	ctx.Fill(0, pillOffset, 1, pillSize, ' ', pillStyle)
}

func (ml *MessageList) MouseEvent(localX int, localY int, event tcell.Event) {
	switch event := event.(type) {
	case *tcell.EventMouse:
		switch event.Buttons() {
		case tcell.Button1:
			if ml.aerc == nil {
				return
			}
			selectedMsg, ok := ml.Clicked(localX, localY)
			if ok {
				ml.Select(selectedMsg)
				acct := ml.aerc.SelectedAccount()
				if acct.Messages().Empty() {
					return
				}
				store := acct.Messages().Store()
				msg := acct.Messages().Selected()
				if msg == nil {
					return
				}
				lib.NewMessageStoreView(msg, store, ml.aerc.DecryptKeys,
					func(view lib.MessageView, err error) {
						if err != nil {
							ml.aerc.PushError(err.Error())
							return
						}
						viewer := NewMessageViewer(acct, ml.aerc.Config(), view)
						ml.aerc.NewTab(viewer, msg.Envelope.Subject)
					})
			}
		case tcell.WheelDown:
			if ml.store != nil {
				ml.store.Next()
			}
			ml.Invalidate()
		case tcell.WheelUp:
			if ml.store != nil {
				ml.store.Prev()
			}
			ml.Invalidate()
		}
	}
}

func (ml *MessageList) Clicked(x, y int) (int, bool) {
	store := ml.Store()
	if store == nil || ml.nmsgs == 0 || y >= ml.nmsgs {
		return 0, false
	}
	return y + ml.scroll, true
}

func (ml *MessageList) Height() int {
	return ml.height
}

func (ml *MessageList) storeUpdate(store *lib.MessageStore) {
	if ml.Store() != store {
		return
	}
	uids := store.Uids()

	if len(uids) > 0 {
		// When new messages come in, advance the cursor accordingly
		// Note that this assumes new messages are appended to the top, which
		// isn't necessarily true once we implement SORT... ideally we'd look
		// for the previously selected UID.
		if len(uids) > ml.nmsgs && ml.nmsgs != 0 {
			for i := 0; i < len(uids)-ml.nmsgs; i++ {
				ml.Store().Next()
			}
		}
		if len(uids) < ml.nmsgs && ml.nmsgs != 0 {
			for i := 0; i < ml.nmsgs-len(uids); i++ {
				ml.Store().Prev()
			}
		}
		ml.nmsgs = len(uids)
	}

	ml.Invalidate()
}

func (ml *MessageList) SetStore(store *lib.MessageStore) {
	if ml.Store() != store {
		ml.scroll = 0
	}
	ml.store = store
	if store != nil {
		ml.spinner.Stop()
		ml.nmsgs = len(store.Uids())
		store.OnUpdate(ml.storeUpdate)
	} else {
		ml.spinner.Start()
	}
	ml.Invalidate()
}

func (ml *MessageList) SetInitDone() {
	ml.isInitalizing = false
}

func (ml *MessageList) Store() *lib.MessageStore {
	return ml.store
}

func (ml *MessageList) Empty() bool {
	store := ml.Store()
	return store == nil || len(store.Uids()) == 0
}

func (ml *MessageList) Selected() *models.MessageInfo {
	store := ml.Store()
	uids := store.Uids()
	return store.Messages[uids[len(uids)-ml.store.SelectedIndex()-1]]
}

func (ml *MessageList) Select(index int) {
	store := ml.Store()
	store.Select(index)
	ml.Invalidate()
}

func (ml *MessageList) ensureScroll() {
	store := ml.Store()
	if store == nil || len(store.Uids()) == 0 {
		return
	}

	h := ml.Height()

	maxScroll := len(store.Uids()) - h
	if maxScroll < 0 {
		maxScroll = 0
	}

	selectedIndex := store.SelectedIndex()

	if selectedIndex >= ml.scroll && selectedIndex < ml.scroll+h {
		if ml.scroll > maxScroll {
			ml.scroll = maxScroll
		}
		return
	}

	if selectedIndex >= ml.scroll+h {
		ml.scroll = selectedIndex - h + 1
	} else if selectedIndex < ml.scroll {
		ml.scroll = selectedIndex
	}

	if ml.scroll > maxScroll {
		ml.scroll = maxScroll
	}
}

func (ml *MessageList) drawEmptyMessage(ctx *ui.Context) {
	uiConfig := ml.aerc.SelectedAccount().UiConfig()
	msg := uiConfig.EmptyMessage
	ctx.Printf((ctx.Width()/2)-(len(msg)/2), 0,
		uiConfig.GetStyle(config.STYLE_MSGLIST_DEFAULT), "%s", msg)
}