// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// 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 <https://www.gnu.org/licenses/gpl-3.0.html>.

package progress

import (
	"fmt"
	"strings"
	"testing"
	"time"

	"git.stormux.org/storm/fenrir/internal/screen"
)

func snapshot(lines ...string) screen.Snapshot {
	s := screen.Snapshot{Terminal: 1, Active: true, Rows: len(lines), Cols: 300}
	for _, line := range lines {
		s.Cells = append(s.Cells, []rune(line+strings.Repeat(" ", s.Cols-len([]rune(line))))...)
	}
	return s
}

func TestWholeRowThrottlingAndFinalValue(t *testing.T) {
	var m Monitor
	now := time.Unix(100, 0)
	before := snapshot("Download 49%", "")
	after := snapshot("Download 50%", "")
	m.Update(before, after, -1)
	if value, ok := m.Next(now); !ok || value != 50 {
		t.Fatal(value, ok)
	}
	for percentage := 51; percentage <= 100; percentage++ {
		next := snapshot("Download "+format_percent(percentage), "")
		m.Update(after, next, -1)
		after = next
	}
	if _, ok := m.Next(now.Add(50 * time.Millisecond)); ok {
		t.Fatal("flood not throttled")
	}
	if value, ok := m.Next(now.Add(100 * time.Millisecond)); !ok || value != 100 {
		t.Fatal("lost final pending value", value, ok)
	}
	if _, ok := m.Next(now.Add(time.Second)); ok {
		t.Fatal("repeated without output")
	}
	next := snapshot("Download 100% complete", "")
	m.Update(after, next, -1)
	if _, ok := m.Next(now.Add(time.Second)); ok {
		t.Fatal("duplicate percentage")
	}
	// A new operation may decrease; completion never disables monitoring.
	m.Update(next, snapshot("Download 1%", ""), -1)
	if value, ok := m.Next(now.Add(2 * time.Second)); !ok || value != 1 {
		t.Fatal(value, ok)
	}
}

func TestMonitorResetFilters(t *testing.T) {
	for _, mode := range []string{"initial", "inactive", "terminal", "generation", "resize", "typing", "prompt", "password", "navigation", "large cursor", "ordinary output"} {
		t.Run(mode, func(t *testing.T) {
			var m Monitor
			now := time.Unix(100, 0)
			before, after := snapshot("Download 20%", "", "", ""), snapshot("Download 30%", "", "", "")
			m.Update(before, after, -1)
			m.Next(now)
			next := snapshot("Download 40%", "", "", "")
			editingRow := -1
			switch mode {
			case "initial":
				after = screen.Snapshot{}
			case "inactive":
				next.Active = false
			case "terminal":
				next.Terminal++
			case "generation":
				next.Generation++
			case "resize":
				next = snapshot("Download 40%", "")
			case "typing":
				editingRow = next.Y
			case "prompt":
				next = snapshot("Download 40%", "Username@host:~$", "", "")
				next.Y = 1
			case "password":
				next = snapshot("Download 40%", "Password:", "", "")
				next.Y = 1
			case "navigation":
				next = after
				next.X = 1
			case "large cursor":
				next.Y = 3
			case "ordinary output":
				next = snapshot("done", "", "", "")
			}
			m.Update(after, next, editingRow)
			if _, ok := m.Next(now.Add(time.Second)); ok || m.Active() {
				t.Fatal("retained progress")
			}
		})
	}
}

func TestMultilineLongRowsAndActivity(t *testing.T) {
	now := time.Unix(100, 0)
	for _, testCase := range []struct {
		lines []string
		want  float64
		ok    bool
	}{
		{[]string{"package 20% [##        ]", "Total 80% [########  ]", ""}, 80, true},
		{[]string{strings.Repeat("package", 35) + " 60% |######    |", "", ""}, 60, true},
		{[]string{"humidity 50%", "some other output", ""}, 0, false},
		{[]string{strings.Repeat("unrelated", 30) + " 50%", "", ""}, 0, false},
		{[]string{"50%", "some other output", ""}, 0, false},
	} {
		var m Monitor
		m.Update(snapshot("", "", ""), snapshot(testCase.lines...), -1)
		value, ok := m.Next(now)
		if ok != testCase.ok || ok && value != testCase.want {
			t.Fatal(testCase, value, ok)
		}
	}
	var m Monitor
	before, after := snapshot("", ""), snapshot("⠋ Working", "")
	m.Update(before, after, -1)
	if value, ok := m.Next(now); !ok || value != 50 {
		t.Fatal(value, ok)
	}
	m.Update(after, snapshot("⠙ Working", ""), -1)
	if _, ok := m.Next(now.Add(500 * time.Millisecond)); ok {
		t.Fatal("activity flood")
	}
	if _, ok := m.Next(now.Add(time.Second)); !ok {
		t.Fatal("missing activity")
	}
	if _, ok := m.Next(now.Add(2 * time.Second)); ok {
		t.Fatal("beeping stopped spinner")
	}
}

func format_percent(value int) string { return fmt.Sprint(value) + "%" }