package validator_test

import (
	"encoding/json"
	"strings"
	"testing"

	"agent-desk/internal/ai/workflow/dsl"
	"agent-desk/internal/ai/workflow/registry"
	"agent-desk/internal/ai/workflow/validator"
)

func TestValidateDefinitionAcceptsMinimalConversationFlow(t *testing.T) {
	result := validator.ValidateDefinition(minimalDefinition(), registry.DefaultRegistry())

	if !result.Valid {
		t.Fatalf("expected valid definition, got errors: %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsMissingStart(t *testing.T) {
	def := minimalDefinition()
	def.Nodes = []dsl.Node{
		{ID: "reply_1", Type: "send_reply", Config: json.RawMessage(`{"text":"hello"}`)},
		{ID: "end_1", Type: "end"},
	}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected missing start to be invalid")
	}
	if !hasValidationMessage(result, "exactly one start node") {
		t.Fatalf("expected start error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnknownNodeType(t *testing.T) {
	def := minimalDefinition()
	def.Nodes = append(def.Nodes, dsl.Node{ID: "unknown_1", Type: "unknown_node"})
	def.Edges = append(def.Edges, dsl.Edge{ID: "e3", Source: "reply_1", Target: "unknown_1"})

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unknown node type to be invalid")
	}
	if !hasValidationMessage(result, "unknown node type") {
		t.Fatalf("expected unknown-node error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnguardedCreateTicket(t *testing.T) {
	def := dsl.Definition{
		SchemaVersion: 1,
		EntryNodeID:   "start_1",
		Nodes: []dsl.Node{
			{ID: "start_1", Type: "start"},
			{ID: "draft_1", Type: "prepare_ticket_draft"},
			{ID: "create_1", Type: "create_ticket"},
			{ID: "end_1", Type: "end"},
		},
		Edges: []dsl.Edge{
			{ID: "e1", Source: "start_1", Target: "draft_1"},
			{ID: "e2", Source: "draft_1", Target: "create_1"},
			{ID: "e3", Source: "create_1", Target: "end_1"},
		},
	}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unguarded create_ticket to be invalid")
	}
	if !hasValidationMessage(result, "requires human_confirm") {
		t.Fatalf("expected confirmation guard error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionAcceptsConfirmedCreateTicket(t *testing.T) {
	def := dsl.Definition{
		SchemaVersion: 1,
		EntryNodeID:   "start_1",
		Nodes: []dsl.Node{
			{ID: "start_1", Type: "start"},
			{ID: "draft_1", Type: "prepare_ticket_draft", Inputs: map[string]dsl.VariableSelector{
				"issue": {NodeID: "start_1", Field: "userMessage"},
			}},
			{ID: "confirm_1", Type: "human_confirm", Inputs: map[string]dsl.VariableSelector{
				"prompt": {NodeID: "start_1", Field: "userMessage"},
			}},
			{ID: "create_1", Type: "create_ticket", Inputs: map[string]dsl.VariableSelector{
				"ticketDraft": {NodeID: "draft_1", Field: "ticketDraft"},
				"confirmed":   {NodeID: "confirm_1", Field: "confirmed"},
			}},
			{ID: "end_1", Type: "end"},
		},
		Edges: []dsl.Edge{
			{ID: "e1", Source: "start_1", Target: "draft_1"},
			{ID: "e2", Source: "draft_1", Target: "confirm_1"},
			{ID: "e3", Source: "confirm_1", Target: "create_1"},
			{ID: "e4", Source: "create_1", Target: "end_1"},
		},
	}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if !result.Valid {
		t.Fatalf("expected confirmed create_ticket to be valid, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsMissingRequiredInputMapping(t *testing.T) {
	def := minimalDefinition()
	def.Nodes[1].Inputs = nil

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected missing required input mapping to be invalid")
	}
	if !hasValidationMessage(result, "required input mapping is missing") {
		t.Fatalf("expected required-input error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnknownInputSourceNode(t *testing.T) {
	def := mappedReplyDefinition()
	def.Nodes[1].Inputs["replyText"] = dsl.VariableSelector{NodeID: "missing_1", Field: "replyText"}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unknown input source node to be invalid")
	}
	if !hasValidationMessage(result, "input source node does not exist") {
		t.Fatalf("expected source-node error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnknownInputSourceField(t *testing.T) {
	def := mappedReplyDefinition()
	def.Nodes[1].Inputs["replyText"] = dsl.VariableSelector{NodeID: "start_1", Field: "missing"}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unknown input source field to be invalid")
	}
	if !hasValidationMessage(result, "input source field does not exist") {
		t.Fatalf("expected source-field error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsIncompatibleInputType(t *testing.T) {
	def := mappedReplyDefinition()
	def.Nodes[1].Inputs["replyText"] = dsl.VariableSelector{NodeID: "start_1", Field: "conversationId"}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected incompatible input type to be invalid")
	}
	if !hasValidationMessage(result, "input type mismatch") {
		t.Fatalf("expected type-mismatch error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionAcceptsMappedKnowledgeFlow(t *testing.T) {
	def := dsl.Definition{
		SchemaVersion: 1,
		EntryNodeID:   "start_1",
		Nodes: []dsl.Node{
			{ID: "start_1", Type: "start"},
			{ID: "retrieve_1", Type: "knowledge_retrieve", Inputs: map[string]dsl.VariableSelector{
				"query": {NodeID: "start_1", Field: "userMessage"},
			}},
			{ID: "reply_1", Type: "send_reply", Inputs: map[string]dsl.VariableSelector{
				"replyText": {NodeID: "start_1", Field: "userMessage"},
			}},
			{ID: "end_1", Type: "end"},
		},
		Edges: []dsl.Edge{
			{ID: "e1", Source: "start_1", Target: "retrieve_1"},
			{ID: "e2", Source: "retrieve_1", Target: "reply_1"},
			{ID: "e3", Source: "reply_1", Target: "end_1"},
		},
	}

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if !result.Valid {
		t.Fatalf("expected mapped knowledge flow to be valid, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnknownConditionOperator(t *testing.T) {
	def := conditionDefinition()
	def.Edges[1].Condition.Operator = "regex"

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unknown condition operator to be invalid")
	}
	if !hasValidationMessage(result, "unsupported condition operator") {
		t.Fatalf("expected condition operator error, got %#v", result.Errors)
	}
}

func TestValidateDefinitionRejectsUnknownConditionVariable(t *testing.T) {
	def := conditionDefinition()
	def.Edges[1].Condition.Left.Field = "missing"

	result := validator.ValidateDefinition(def, registry.DefaultRegistry())

	if result.Valid {
		t.Fatalf("expected unknown condition variable to be invalid")
	}
	if !hasValidationMessage(result, "condition source field does not exist") {
		t.Fatalf("expected condition variable error, got %#v", result.Errors)
	}
}

func minimalDefinition() dsl.Definition {
	return dsl.Definition{
		SchemaVersion: 1,
		EntryNodeID:   "start_1",
		Nodes: []dsl.Node{
			{ID: "start_1", Type: "start"},
			{ID: "reply_1", Type: "send_reply", Config: json.RawMessage(`{"text":"hello"}`), Inputs: map[string]dsl.VariableSelector{
				"replyText": {NodeID: "start_1", Field: "userMessage"},
			}},
			{ID: "end_1", Type: "end"},
		},
		Edges: []dsl.Edge{
			{ID: "e1", Source: "start_1", Target: "reply_1"},
			{ID: "e2", Source: "reply_1", Target: "end_1"},
		},
	}
}

func mappedReplyDefinition() dsl.Definition {
	def := minimalDefinition()
	def.Nodes[1].Inputs = map[string]dsl.VariableSelector{
		"replyText": {NodeID: "start_1", Field: "userMessage"},
	}
	return def
}

func conditionDefinition() dsl.Definition {
	return dsl.Definition{
		SchemaVersion: 1,
		EntryNodeID:   "start_1",
		Nodes: []dsl.Node{
			{ID: "start_1", Type: "start"},
			{ID: "condition_1", Type: "condition"},
			{ID: "end_1", Type: "end"},
		},
		Edges: []dsl.Edge{
			{ID: "e1", Source: "start_1", Target: "condition_1"},
			{
				ID:     "e2",
				Source: "condition_1",
				Target: "end_1",
				Condition: &dsl.Condition{
					Left:     &dsl.VariableSelector{NodeID: "start_1", Field: "userMessage"},
					Operator: "eq",
					Right:    "hello",
				},
			},
			{ID: "e3", Source: "condition_1", Target: "end_1"},
		},
	}
}

func hasValidationMessage(result validator.Result, want string) bool {
	for _, item := range result.Errors {
		if strings.Contains(item.Message, want) {
			return true
		}
	}
	return false
}