package agentfinalizer

import (
	"path/filepath"
	"testing"
	"time"

	"cyberstrike-ai/internal/database"
	"cyberstrike-ai/internal/mcp"

	"go.uber.org/zap"
)

func newDecisionTestDB(t *testing.T) *database.DB {
	t.Helper()
	db, err := database.NewDB(filepath.Join(t.TempDir(), "finalizer.db"), zap.NewNop())
	if err != nil {
		t.Fatalf("NewDB: %v", err)
	}
	t.Cleanup(func() { _ = db.Close() })
	return db
}

func saveDecisionTestExecution(t *testing.T, db *database.DB, id, status string) {
	t.Helper()
	if err := db.SaveToolExecution(&mcp.ToolExecution{
		ID:        id,
		ToolName:  "test::tool",
		Arguments: map[string]interface{}{"input": id},
		Status:    status,
		StartTime: time.Now(),
	}); err != nil {
		t.Fatalf("SaveToolExecution(%s): %v", id, err)
	}
}

func TestDecideBlocksPendingToolExecutions(t *testing.T) {
	db := newDecisionTestDB(t)
	saveDecisionTestExecution(t, db, "run-queued", mcp.ToolExecutionStatusQueued)
	saveDecisionTestExecution(t, db, "run-running", mcp.ToolExecutionStatusRunning)
	saveDecisionTestExecution(t, db, "run-completed", mcp.ToolExecutionStatusCompleted)

	d := Decide(db, Input{
		Response:        "工具还没全部结束时，这只是一段候选输出。",
		MCPExecutionIDs: []string{"run-queued", "run-running", "run-completed"},
	})

	if d.Finalizable || d.Finalized {
		t.Fatalf("pending tools should not be finalizable: %+v", d)
	}
	if d.Status != StatusInProgress || d.CompletionReason != ReasonPendingTools {
		t.Fatalf("status/reason = %s/%s, want %s/%s", d.Status, d.CompletionReason, StatusInProgress, ReasonPendingTools)
	}
	if got, want := len(d.PendingExecutionIDs), 2; got != want {
		t.Fatalf("pending execution count = %d, want %d (%v)", got, want, d.PendingExecutionIDs)
	}
}

func TestDecideBlocksAwaitingHITLAndEmptyCandidate(t *testing.T) {
	hitl := Decide(nil, Input{Response: "等待人工审批", AwaitingHITL: true})
	if hitl.Finalizable || hitl.Status != StatusAwaitingHITL || hitl.CompletionReason != ReasonAwaitingHITL {
		t.Fatalf("HITL decision mismatch: %+v", hitl)
	}

	empty := Decide(nil, Input{Response: "⚠️ Eino 执行完成，但未捕获到助手文本输出。"})
	if empty.Finalizable || empty.Status != StatusBlocked || empty.CompletionReason != ReasonEmptyResponse {
		t.Fatalf("empty candidate decision mismatch: %+v", empty)
	}
}

func TestDecideBlocksWhenExecutionEvidenceIsRequiredButMissing(t *testing.T) {
	d := Decide(nil, Input{
		Response:                 "任务已处理完成。",
		RequireExecutionEvidence: true,
	})
	if d.Finalizable || d.Finalized {
		t.Fatalf("missing required execution evidence should not finalize: %+v", d)
	}
	if d.Status != StatusBlocked || d.CompletionReason != ReasonMissingEvidence {
		t.Fatalf("status/reason = %s/%s, want %s/%s", d.Status, d.CompletionReason, StatusBlocked, ReasonMissingEvidence)
	}
	if d.EvidenceVerified {
		t.Fatalf("missing required execution evidence should be marked unverified: %+v", d)
	}
	if len(d.MissingChecks) == 0 {
		t.Fatalf("missing checks should explain the evidence gap: %+v", d)
	}
}

func TestDecideBlocksWhenOnlyFailedEvidenceIsRecorded(t *testing.T) {
	db := newDecisionTestDB(t)
	saveDecisionTestExecution(t, db, "run-failed", mcp.ToolExecutionStatusFailed)
	saveDecisionTestExecution(t, db, "run-cancelled", mcp.ToolExecutionStatusCancelled)

	d := Decide(db, Input{
		Response:                 "任务已处理完成。",
		MCPExecutionIDs:          []string{"run-failed", "run-cancelled"},
		RequireExecutionEvidence: true,
	})

	if d.Finalizable || d.Finalized {
		t.Fatalf("failed evidence should not satisfy required execution evidence: %+v", d)
	}
	if d.Status != StatusBlocked || d.CompletionReason != ReasonMissingEvidence {
		t.Fatalf("status/reason = %s/%s, want %s/%s", d.Status, d.CompletionReason, StatusBlocked, ReasonMissingEvidence)
	}
}

func TestDecideFinalizesCompletedEvidence(t *testing.T) {
	db := newDecisionTestDB(t)
	saveDecisionTestExecution(t, db, "run-ok", mcp.ToolExecutionStatusCompleted)

	d := Decide(db, Input{
		Response:                 "任务已处理完成，见工具执行记录。",
		MCPExecutionIDs:          []string{"run-ok"},
		RequireExecutionEvidence: true,
	})

	if !d.Finalizable || !d.Finalized || d.Status != StatusCompleted {
		t.Fatalf("completed execution should finalize: %+v", d)
	}
	if !d.EvidenceVerified || len(d.EvidenceRefs) != 1 {
		t.Fatalf("evidence refs mismatch: %+v", d)
	}
}

func TestDecideAllowsInformationalAnswerWhenExecutionEvidenceIsNotRequired(t *testing.T) {
	d := Decide(nil, Input{Response: "这是一个概念解释，不需要执行工具。"})
	if !d.Finalizable || !d.Finalized || d.Status != StatusCompleted {
		t.Fatalf("informational response should finalize when execution evidence is not required: %+v", d)
	}
}