package render

import (
	"bytes"
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"testing"

	"github.com/kotoyuuko/zenmux-usage-cli/internal/api"
)

func TestRenderJSONSingle_BytePassthrough(t *testing.T) {
	src, err := os.ReadFile(filepath.Join("..", "api", "testdata", "sample.json"))
	if err != nil {
		t.Fatal(err)
	}
	var buf bytes.Buffer
	if err := RenderJSONSingle(&buf, src); err != nil {
		t.Fatalf("RenderJSONSingle: %v", err)
	}

	// Output must parse as the same JSON body.
	var orig, got map[string]any
	if err := json.Unmarshal(src, &orig); err != nil {
		t.Fatalf("parse src: %v", err)
	}
	if err := json.Unmarshal(buf.Bytes(), &got); err != nil {
		t.Fatalf("parse out: %v", err)
	}
	origStr, _ := json.Marshal(orig)
	gotStr, _ := json.Marshal(got)
	if string(origStr) != string(gotStr) {
		t.Errorf("roundtrip mismatch:\nwant %s\n got %s", origStr, gotStr)
	}

	// Must end with a newline.
	if buf.Len() == 0 || buf.Bytes()[buf.Len()-1] != '\n' {
		t.Error("output should end with a newline")
	}
}

func TestRenderJSONMulti_ShapeAndOrder(t *testing.T) {
	src, _ := os.ReadFile(filepath.Join("..", "api", "testdata", "sample.json"))
	var r api.Response
	if err := json.Unmarshal(src, &r); err != nil {
		t.Fatalf("parse sample: %v", err)
	}

	results := []AccountResult{
		{Name: "personal", Response: &r},
		{Name: "work", Err: errors.New("authentication rejected: HTTP 401")},
		{Name: "extra", Response: &api.Response{Success: false, Error: "quota exhausted"}},
	}
	var buf bytes.Buffer
	if err := RenderJSONMulti(&buf, results); err != nil {
		t.Fatalf("RenderJSONMulti: %v", err)
	}

	var got []map[string]any
	if err := json.Unmarshal(buf.Bytes(), &got); err != nil {
		t.Fatalf("parse out: %v", err)
	}
	if len(got) != 3 {
		t.Fatalf("want 3 entries, got %d", len(got))
	}
	if got[0]["account"] != "personal" || got[1]["account"] != "work" || got[2]["account"] != "extra" {
		t.Errorf("order wrong: %+v", got)
	}

	// personal: success=true, data non-null, error=null
	if got[0]["success"] != true {
		t.Error("personal.success should be true")
	}
	if got[0]["data"] == nil {
		t.Error("personal.data should be populated")
	}
	if got[0]["error"] != nil {
		t.Errorf("personal.error should be null, got %v", got[0]["error"])
	}

	// work: success=false, data=null, error non-empty
	if got[1]["success"] != false {
		t.Error("work.success should be false")
	}
	if got[1]["data"] != nil {
		t.Error("work.data should be null")
	}
	if got[1]["error"] == nil || got[1]["error"].(string) == "" {
		t.Error("work.error should be non-empty")
	}

	// extra: API-level failure (success=false in body). data=null, error from payload.
	if got[2]["success"] != false {
		t.Error("extra.success should be false")
	}
	if got[2]["data"] != nil {
		t.Error("extra.data should be null")
	}
	if got[2]["error"].(string) != "quota exhausted" {
		t.Errorf("extra.error = %q, want quota exhausted", got[2]["error"])
	}
}