package main

import (
	"encoding/json"
	"math"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestIntentProvenance(t *testing.T) {
	for _, status := range []goalStatus{active, paused, "complete", "budgetLimited", "usageLimited", blocked, "cleared"} {
		got, ok, err := (&intentLog{}).parse(intentLine(status))
		if err != nil || !ok || got != status {
			t.Fatalf("status=%s got=%s match=%v error=%v", status, got, ok, err)
		}
	}
	line := string(intentLine(active))
	for _, text := range []string{
		strings.Replace(line, "user.goal", "user.input", 1),
		strings.Replace(line, "\"role\":\"user\"", "\"role\":\"assistant\"", 1),
		strings.Replace(line, "input_text", "output_text", 1),
	} {
		if _, ok, err := (&intentLog{}).parse([]byte(text)); err != nil || ok {
			t.Fatalf("accepted untrusted instruction: match=%v error=%v", ok, err)
		}
	}
}

func TestIntentTail(t *testing.T) {
	path := filepath.Join(t.TempDir(), "rollout.jsonl")
	if err := os.WriteFile(path, intentLine(active), 0600); err != nil {
		t.Fatal(err)
	}
	log, err := openIntent(path)
	if err != nil {
		t.Fatal(err)
	}
	if status, err := log.read(math.MaxInt64); err != nil || status != "" {
		t.Fatal("replayed historical authorization")
	}
	data := intentLine(paused)
	appendIntent(t, path, data[:len(data)/2])
	if status, err := log.read(math.MaxInt64); err != nil || status != "" {
		t.Fatal("accepted partial record")
	}
	appendIntent(t, path, data[len(data)/2:])
	if status, err := log.read(math.MaxInt64); err != nil || status != paused {
		t.Fatalf("partial completion: %s %v", status, err)
	}
	appendIntent(t, path, intentLine(active))
	if err := log.seal(); err != nil {
		t.Fatal(err)
	}
	if status, err := log.read(math.MaxInt64); err != nil || status != "" {
		t.Fatal("replayed pre-cancellation authorization")
	}
	appendIntent(t, path, intentLine(active))
	if status, err := log.read(math.MaxInt64); err != nil || status != active {
		t.Fatalf("new authorization: %s %v", status, err)
	}
}

func TestIntentFence(t *testing.T) {
	path := filepath.Join(t.TempDir(), "rollout.jsonl")
	if err := os.WriteFile(path, nil, 0600); err != nil {
		t.Fatal(err)
	}
	log, err := openIntent(path)
	if err != nil {
		t.Fatal(err)
	}
	data := intentLine(active)
	appendIntent(t, path, data[:len(data)/2])
	if err := log.seal(); err != nil {
		t.Fatal(err)
	}
	appendIntent(t, path, data[len(data)/2:])
	if status, err := log.read(math.MaxInt64); err != nil || status != "" {
		t.Fatalf("replayed instruction spanning cancellation: %s %v", status, err)
	}
	appendIntent(t, path, intentLine(active))
	if status, err := log.read(math.MaxInt64); err != nil || status != active {
		t.Fatalf("new instruction after cancellation: %s %v", status, err)
	}
}

func TestIntentCut(t *testing.T) {
	path := filepath.Join(t.TempDir(), "rollout.jsonl")
	if err := os.WriteFile(path, nil, 0600); err != nil {
		t.Fatal(err)
	}
	log, err := openIntent(path)
	if err != nil {
		t.Fatal(err)
	}
	appendIntent(t, path, intentLine(paused))
	end, err := log.end()
	if err != nil {
		t.Fatal(err)
	}
	appendIntent(t, path, intentLine(active))
	if status, err := log.read(end); err != nil || status != paused {
		t.Fatalf("read beyond captured input: %s %v", status, err)
	}
	if status, err := log.read(math.MaxInt64); err != nil || status != active {
		t.Fatalf("lost later input: %s %v", status, err)
	}
}

func agentCall(id, name, namespace string, status goalStatus) []byte {
	return append(mustJSON(map[string]any{"type": "response_item", "payload": map[string]any{
		"type": "function_call", "name": name, "namespace": namespace, "call_id": id,
		"arguments": string(mustJSON(struct {
			Status goalStatus `json:"status"`
		}{status})),
	}}), '\n')
}

func agentReply(id, output string) []byte {
	return append(mustJSON(map[string]any{"type": "response_item", "payload": map[string]any{
		"type": "function_call_output", "call_id": id, "output": output,
	}}), '\n')
}

func TestAgentIntent(t *testing.T) {
	blockedReply := string(mustJSON(goalResult{Goal: testGoal(blocked)}))
	for _, tc := range []struct {
		name, tool, namespace string
		status                goalStatus
		id, replyID, output   string
		want                  goalStatus
	}{
		{"plain", "update_goal", "", blocked, "call-1", "call-1", blockedReply, blocked},
		{"functions", "update_goal", "functions", blocked, "call-1", "call-1", blockedReply, blocked},
		{"external", "update_goal", "plugin", blocked, "call-1", "call-1", blockedReply, ""},
		{"read", "get_goal", "", blocked, "call-1", "call-1", blockedReply, ""},
		{"other tool", "other", "", blocked, "call-1", "call-1", blockedReply, ""},
		{"other status", "update_goal", "", paused, "call-1", "call-1", blockedReply, ""},
		{"no id", "update_goal", "", blocked, "", "", blockedReply, ""},
		{"other id", "update_goal", "", blocked, "call-1", "call-2", blockedReply, ""},
		{"rejected", "update_goal", "", blocked, "call-1", "call-1", "failed to update goal", ""},
		{"no goal", "update_goal", "", blocked, "call-1", "call-1", string(mustJSON(goalResult{})), ""},
		{"not blocked", "update_goal", "", blocked, "call-1", "call-1", string(mustJSON(goalResult{Goal: testGoal(active)})), ""},
	} {
		t.Run(tc.name, func(t *testing.T) {
			path := filepath.Join(t.TempDir(), "rollout.jsonl")
			if err := os.WriteFile(path, nil, 0600); err != nil {
				t.Fatal(err)
			}
			log, err := openIntent(path)
			if err != nil {
				t.Fatal(err)
			}
			appendIntent(t, path, agentCall(tc.id, tc.tool, tc.namespace, tc.status))
			if status, err := log.read(math.MaxInt64); err != nil || status != "" {
				t.Fatalf("unfinished call produced intent %q: %v", status, err)
			}
			appendIntent(t, path, agentReply(tc.replyID, tc.output))
			if status, err := log.read(math.MaxInt64); err != nil || status != tc.want {
				t.Fatalf("intent=%q want=%q error=%v", status, tc.want, err)
			}
			appendIntent(t, path, agentReply(tc.id, blockedReply))
			if tc.replyID == tc.id {
				if status, err := log.read(math.MaxInt64); err != nil || status != "" {
					t.Fatalf("replayed completed call: %q %v", status, err)
				}
			}
		})
	}
}

func TestAgentPending(t *testing.T) {
	path := filepath.Join(t.TempDir(), "rollout.jsonl")
	if err := os.WriteFile(path, nil, 0600); err != nil {
		t.Fatal(err)
	}
	log, err := openIntent(path)
	if err != nil {
		t.Fatal(err)
	}
	appendIntent(t, path, agentCall("call-1", "update_goal", "", blocked))
	if status, err := log.read(math.MaxInt64); err != nil || status != "" {
		t.Fatalf("unfinished call produced intent %q: %v", status, err)
	}
	data, err := json.Marshal(log)
	if err != nil {
		t.Fatal(err)
	}
	var restored intentLog
	if err := json.Unmarshal(data, &restored); err != nil {
		t.Fatal(err)
	}
	appendIntent(t, path, agentReply("call-1", string(mustJSON(goalResult{Goal: testGoal(blocked)}))))
	if status, err := restored.read(math.MaxInt64); err != nil || status != blocked {
		t.Fatalf("lost pending call across checkpoint: %q %v", status, err)
	}
}

func TestAgentOtherItems(t *testing.T) {
	var log intentLog
	for _, payload := range []map[string]any{
		{"type": "tool_search_call", "arguments": map[string]string{"query": "blocked"}},
		{"type": "function_call", "name": "update_goal", "call_id": "call-1", "arguments": "invalid JSON"},
		{"type": "function_call_output", "call_id": "call-1", "output": string(mustJSON(goalResult{Goal: testGoal(blocked)}))},
	} {
		line := mustJSON(map[string]any{"type": "response_item", "payload": payload})
		if status, match, err := log.parse(line); err != nil || match || status != "" {
			t.Fatalf("unrelated item produced intent=%q match=%v error=%v", status, match, err)
		}
	}
}