package service

import (
	"strings"
	"testing"
	"view/model"
)

func TestParseCommitPatches(t *testing.T) {
	raw := `diff --git a/main.go b/main.go
index 111..222 100644
--- a/main.go
+++ b/main.go
@@ -1,2 +1,3 @@
 package main
+// feature
`
	got := parseCommitPatches(raw)
	p, ok := got["main.go"]
	if !ok || p.Binary || p.Text == "" {
		t.Fatalf("patch=%#v", got)
	}
	if !strings.Contains(p.Text, "+// feature") {
		t.Fatalf("missing added line: %q", p.Text)
	}
}

func TestParseCommitPatchesBinaryAndDelete(t *testing.T) {
	raw := `diff --git a/logo.png b/logo.png
index 111..222 100644
Binary files a/logo.png and b/logo.png differ
diff --git a/gone.go b/gone.go
deleted file mode 100644
index 111..000
--- a/gone.go
+++ /dev/null
@@ -1 +0,0 @@
-package gone
`
	got := parseCommitPatches(raw)
	if !got["logo.png"].Binary {
		t.Fatalf("binary not marked: %#v", got["logo.png"])
	}
	if got["gone.go"].Text == "" || got["gone.go"].Binary {
		t.Fatalf("deleted file patch=%#v", got["gone.go"])
	}
}

func TestFormatCommitDiffForAI(t *testing.T) {
	d := model.GitCommitDetail{
		GitCommit: model.GitCommit{Hash: "abc123", Author: "Ann", Email: "a@b.c", Date: "2026-08-19", Message: "add feature", Added: 2, Deleted: 1},
		Files: []model.GitFileChange{
			{Path: "main.go", Status: "modified", Added: 2, Deleted: 1, Patch: "+// feature\n-old"},
			{Path: "logo.png", Status: "modified", Binary: true},
		},
	}
	text := FormatCommitDiffForAI(d, 0)
	if !strings.Contains(text, "add feature") || !strings.Contains(text, "main.go") || !strings.Contains(text, "+// feature") {
		t.Fatalf("unexpected prompt:\n%s", text)
	}
	if !strings.Contains(text, "[binary]") {
		t.Fatal("binary file should be listed")
	}
	tiny := FormatCommitDiffForAI(d, 80)
	if !strings.Contains(tiny, "因过长未纳入") && !strings.Contains(tiny, "add feature") {
		t.Fatalf("truncated prompt:\n%s", tiny)
	}
}