package actions

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"gitea.com/gitea/gitea-mcp/pkg/flag"

	"github.com/modelcontextprotocol/go-sdk/mcp"
)

func TestAllRunsTerminal(t *testing.T) {
	tests := []struct {
		name string
		runs []map[string]any
		want bool
	}{
		{"no runs", nil, true},
		{"single completed run with conclusion", []map[string]any{{"status": "completed", "conclusion": "success"}}, true},
		{"single running run", []map[string]any{{"status": "running", "conclusion": ""}}, false},
		{"single waiting run", []map[string]any{{"status": "waiting"}}, false},
		{"mixed terminal and running", []map[string]any{
			{"status": "completed", "conclusion": "success"},
			{"status": "running"},
		}, false},
		{"all terminal", []map[string]any{
			{"status": "completed", "conclusion": "failure"},
			{"status": "completed", "conclusion": "cancelled"},
		}, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := allRunsTerminal(tt.runs); got != tt.want {
				t.Errorf("allRunsTerminal() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestWaitForRunsUntilTerminal_ReturnsOnceTerminal(t *testing.T) {
	calls := 0
	fetch := func(ctx context.Context) ([]map[string]any, error) {
		calls++
		if calls < 3 {
			return []map[string]any{{"status": "running"}}, nil
		}
		return []map[string]any{{"status": "completed", "conclusion": "success"}}, nil
	}

	runs, timedOut, err := waitForRunsUntilTerminal(context.Background(), time.Second, time.Millisecond, fetch)
	if err != nil {
		t.Fatalf("waitForRunsUntilTerminal() error = %v", err)
	}
	if timedOut {
		t.Fatalf("expected timedOut = false")
	}
	if calls != 3 {
		t.Fatalf("expected 3 fetch calls, got %d", calls)
	}
	if len(runs) != 1 || runs[0]["conclusion"] != "success" {
		t.Fatalf("unexpected runs: %v", runs)
	}
}

func TestWaitForRunsUntilTerminal_TimesOut(t *testing.T) {
	fetch := func(ctx context.Context) ([]map[string]any, error) {
		return []map[string]any{{"status": "running"}}, nil
	}

	runs, timedOut, err := waitForRunsUntilTerminal(context.Background(), 20*time.Millisecond, time.Millisecond, fetch)
	if err != nil {
		t.Fatalf("waitForRunsUntilTerminal() error = %v", err)
	}
	if !timedOut {
		t.Fatalf("expected timedOut = true")
	}
	if len(runs) != 1 {
		t.Fatalf("expected last fetched runs to be returned, got %v", runs)
	}
}

func TestWaitForRunsUntilTerminal_PropagatesFetchError(t *testing.T) {
	wantErr := errors.New("boom")
	fetch := func(ctx context.Context) ([]map[string]any, error) {
		return nil, wantErr
	}

	_, _, err := waitForRunsUntilTerminal(context.Background(), time.Second, time.Millisecond, fetch)
	if !errors.Is(err, wantErr) {
		t.Fatalf("waitForRunsUntilTerminal() error = %v, want %v", err, wantErr)
	}
}

func Test_waitForPRChecksFn(t *testing.T) {
	const (
		owner      = "octo"
		repo       = "demo"
		pullNumber = 42
		headSHA    = "abc123"
	)

	var runsRequests int32

	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		switch {
		case r.URL.Path == fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d", owner, repo, pullNumber):
			_, _ = fmt.Fprintf(w, `{"head":{"sha":%q}}`, headSHA)
		case r.URL.Path == fmt.Sprintf("/api/v1/repos/%s/%s/actions/runs", owner, repo):
			atomic.AddInt32(&runsRequests, 1)
			if r.URL.Query().Get("head_sha") != headSHA {
				t.Errorf("expected head_sha query param %q, got %q", headSHA, r.URL.Query().Get("head_sha"))
			}
			_, _ = fmt.Fprint(w, `{"workflow_runs":[{"id":1,"status":"completed","conclusion":"success"},{"id":2,"status":"completed","conclusion":"failure"}]}`)
		default:
			http.NotFound(w, r)
		}
	})

	server := httptest.NewServer(handler)
	defer server.Close()

	var mu sync.Mutex
	mu.Lock()
	origHost, origToken := flag.Host, flag.Token
	flag.Host, flag.Token = server.URL, ""
	mu.Unlock()
	defer func() {
		mu.Lock()
		flag.Host, flag.Token = origHost, origToken
		mu.Unlock()
	}()

	args := map[string]any{
		"owner":       owner,
		"repo":        repo,
		"pull_number": float64(pullNumber),
	}

	result, err := waitForPRChecksFn(context.Background(), args)
	if err != nil {
		t.Fatalf("waitForPRChecksFn() error = %v", err)
	}
	if atomic.LoadInt32(&runsRequests) != 1 {
		t.Fatalf("expected exactly 1 runs request, got %d", runsRequests)
	}

	if len(result.Content) == 0 {
		t.Fatalf("expected content in result")
	}
	textContent, ok := result.Content[0].(*mcp.TextContent)
	if !ok {
		t.Fatalf("expected text content, got %T", result.Content[0])
	}
	if !strings.Contains(textContent.Text, headSHA) {
		t.Fatalf("expected result to mention head sha %q, got %s", headSHA, textContent.Text)
	}
	if !strings.Contains(textContent.Text, `"timed_out":false`) {
		t.Fatalf("expected result to report timed_out=false, got %s", textContent.Text)
	}
}