package main

import (
	"strings"
	"testing"

	"github.com/charmbracelet/x/ansi"
)

func TestParseCommentBodyExtractsSuggestionFences(t *testing.T) {
	body := "Use the clearer name:\n\n```suggestion:-0+0\n    better_name = value\n```\n\nThis also matches the API."
	got := parseCommentBody(body)
	if len(got.Suggestions) != 1 || got.Suggestions[0] != "    better_name = value" {
		t.Fatalf("suggestions = %#v", got.Suggestions)
	}
	if strings.Contains(got.Prose, "```") || !strings.Contains(got.Prose, "Use the clearer name") ||
		!strings.Contains(got.Prose, "matches the API") {
		t.Fatalf("prose = %q", got.Prose)
	}
}

func TestReviewedSourceLinesUseHistoricalSelection(t *testing.T) {
	comment := ReviewComment{
		DiffHunk:          "@@ -38,5 +38,5 @@\n context\n old_name = value\n return old_name\n context\n context",
		OriginalStartLine: 39,
		OriginalLine:      40,
	}
	got := reviewedSourceLines(ReviewThread{DiffSide: "RIGHT"}, comment)
	want := []string{"old_name = value", "return old_name"}
	if strings.Join(got, "\n") != strings.Join(want, "\n") {
		t.Fatalf("reviewed source = %#v, want %#v", got, want)
	}
}

func TestNormalizeSuggestionPreservesRelativeIndent(t *testing.T) {
	removed, added := normalizeSuggestion(
		[]string{"        if old:", "            run_old()"},
		"        if new:\n            run_new()",
	)
	if strings.Join(removed, "\n") != "if old:\n    run_old()" {
		t.Fatalf("removed = %#v", removed)
	}
	if strings.Join(added, "\n") != "if new:\n    run_new()" {
		t.Fatalf("added = %#v", added)
	}
}

func TestDetailRendersSuggestionAsRemovalAndAddition(t *testing.T) {
	m := NewApp(nil, "o", "r", false, 50, 10)
	m.width = 100
	m.details = PRDetails{Threads: []ReviewThread{{
		Path:     "example.py",
		Line:     10,
		DiffSide: "RIGHT",
		Comments: []ReviewComment{{
			Author:            "reviewer",
			Body:              "Use this instead:\n```suggestion\nnew_value = compute()\nreturn new_value\n```",
			DiffHunk:          "@@ -10,2 +10,2 @@\nold_value = compute()\nreturn old_value",
			OriginalLine:      11,
			OriginalStartLine: 10,
		}},
	}}}

	var (
		removed, added int
		rendered       strings.Builder
	)
	for _, line := range m.detailLines(60) {
		rendered.WriteString(ansi.Strip(line.rail + line.fixed + line.text))
		rendered.WriteByte('\n')
		switch line.suggestionChange {
		case '-':
			removed++
		case '+':
			added++
		}
	}
	if removed != 2 || added != 2 {
		t.Fatalf("suggestion rows: removed=%d added=%d\n%s", removed, added, rendered.String())
	}
	if strings.Contains(rendered.String(), "```suggestion") ||
		!strings.Contains(rendered.String(), "│ @reviewer") ||
		!strings.Contains(rendered.String(), "│ suggested change") {
		t.Fatalf("suggestion was not rendered structurally:\n%s", rendered.String())
	}
}

func TestSuggestionBackgroundIsDirectionalWithoutTextUnderline(t *testing.T) {
	removed := suggestionHighlight("  - ", "old", 12, '-')
	added := suggestionHighlight("  + ", "new", 12, '+')
	if !strings.Contains(removed, "\x1b[48;5;52m") ||
		!strings.Contains(added, "\x1b[48;5;22m") {
		t.Fatalf("suggestion decorations missing: removed=%q added=%q", removed, added)
	}
	if strings.Contains(removed, "\x1b[4m") || strings.Contains(added, "\x1b[4m") ||
		strings.Contains(removed, "\x1b[4;") || strings.Contains(added, "\x1b[4;") ||
		strings.Contains(removed, "\x1b[58;") || strings.Contains(added, "\x1b[58;") {
		t.Fatal("suggestion rendering still enables terminal underlining")
	}
	if ansi.StringWidth(removed) != 12 || ansi.StringWidth(added) != 12 {
		t.Fatal("suggestion backgrounds do not fill the row")
	}
	if !strings.Contains(removed, "\x1b[0m\x1b[48;5;52m     ") ||
		!strings.Contains(added, "\x1b[0m\x1b[48;5;22m     ") {
		t.Fatal("padded row remainder is still underlined")
	}
}

func TestMultipleSuggestionsStayInsideCommentBlock(t *testing.T) {
	m := NewApp(nil, "o", "r", false, 50, 10)
	m.width = 100
	m.details = PRDetails{Threads: []ReviewThread{{
		Path: "main.go", Line: 1, DiffSide: "RIGHT",
		Comments: []ReviewComment{{
			Author: "alice", OriginalLine: 1,
			DiffHunk: "@@ -1 +1 @@\nold",
			Body:     "```suggestion\nfirst\n```\n```suggestion\nsecond\n```",
		}},
	}}}
	var rendered strings.Builder
	for _, line := range m.detailLines(60) {
		rendered.WriteString(ansi.Strip(line.rail + line.fixed + line.text))
		rendered.WriteByte('\n')
	}
	if !strings.Contains(rendered.String(), "│ @alice") ||
		!strings.Contains(rendered.String(), "│ suggested change 1/2") ||
		!strings.Contains(rendered.String(), "│ suggested change 2/2") {
		t.Fatalf("suggestions escaped the comment block:\n%s", rendered.String())
	}
}

func TestSuggestionGutterHasNoLeadingPadding(t *testing.T) {
	lines := wrapSuggestionLine("main.go", "replacement()", '+', fullCodeRange("replacement()"), 30)
	if len(lines) == 0 || ansi.Strip(lines[0].fixed) != "+ " {
		t.Fatalf("suggestion gutter = %q, want compact marker", ansi.Strip(lines[0].fixed))
	}
}

func TestSuggestionChangedRangesAlignInsertedLines(t *testing.T) {
	removed := []string{"def setup():", "    if ready:", "        run()"}
	added := []string{"def setup():", "    super().setup()", "    if ready:", "        run()"}
	removedRanges, addedRanges := suggestionChangedRanges(removed, added)

	for i, changed := range removedRanges {
		if changed.End != changed.Start {
			t.Fatalf("unchanged removed line %d marked as changed: %#v", i, changed)
		}
	}
	for _, index := range []int{0, 2, 3} {
		if changed := addedRanges[index]; changed.End != changed.Start {
			t.Fatalf("unchanged added line %d marked as changed: %#v", index, changed)
		}
	}
	if addedRanges[1] != fullCodeRange(added[1]) {
		t.Fatalf("inserted line range = %#v", addedRanges[1])
	}
}

func TestSuggestionChangedRangeIsCharacterPrecise(t *testing.T) {
	removed, added := changedRange("value = old_name()", "value = new_name()")
	if got := "value = old_name()"[removed.Start:removed.End]; got != "old" {
		t.Fatalf("removed range selected %q", got)
	}
	if got := "value = new_name()"[added.Start:added.End]; got != "new" {
		t.Fatalf("added range selected %q", got)
	}
}

func TestChangedSnippetGetsDarkerBackground(t *testing.T) {
	code := highlightedSource("go", "value := oldName()")
	decorated := highlightCodeRange(code, codeRange{Start: 9, End: 16}, '-')
	if !strings.Contains(decorated, "\x1b[48;2;55;0;0m") {
		t.Fatalf("darker intra-line background missing: %q", decorated)
	}
	if ansi.Strip(decorated) != "value := oldName()" {
		t.Fatalf("highlight altered source: %q", ansi.Strip(decorated))
	}
}