package agent

import (
    "path/filepath"
    "strings"
    "testing"

    "ai-agent/internal/llm"
    "ai-agent/internal/mcp"
    "ai-agent/internal/memory"
)

func newTestAgentWithMemory(t *testing.T) *Agent {
    t.Helper()
    store := memory.NewStore(filepath.Join(t.TempDir(), "test-memories.json"))
    return &Agent{memoryStore: store, registry: mcp.NewRegistry()}
}

func TestHandleMemoryTool(t *testing.T) {
    tests := []struct {
        name       string
        toolCall   llm.ToolCall
        wantSubstr string
        wantErr    bool
    }{
        {
            name: "dispatch to save",
            toolCall: llm.ToolCall{
                Name:      "memory_save",
                Arguments: map[string]any{"content": "test fact", "tags": []any{"tag1"}},
            },
            wantSubstr: "Memory saved (id:",
            wantErr:    false,
        },
        {
            name: "dispatch to recall",
            toolCall: llm.ToolCall{
                Name:      "memory_recall",
                Arguments: map[string]any{"query": "test"},
            },
            wantSubstr: "No matching memories found.",
            wantErr:    false,
        },
        {
            name: "unknown tool",
            toolCall: llm.ToolCall{
                Name:      "unknown",
                Arguments: map[string]any{},
            },
            wantSubstr: "unknown memory tool: unknown",
            wantErr:    true,
        },
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            ag := newTestAgentWithMemory(t)
            result, isErr := ag.handleMemoryTool(tt.toolCall)
            if isErr != tt.wantErr {
                t.Errorf("handleMemoryTool() isErr = %v, want %v", isErr, tt.wantErr)
            }
            if !strings.Contains(result, tt.wantSubstr) {
                t.Errorf("handleMemoryTool() = %q, want substring %q", result, tt.wantSubstr)
            }
        })
    }
}

func TestHandleMemorySave(t *testing.T) {
    tests := []struct {
        name       string
        args       map[string]any
        wantSubstr string
        wantErr    bool
    }{
        {
            name:       "valid with tags as []any",
            args:       map[string]any{"content": "test fact", "tags": []any{"tag1", "tag2"}},
            wantSubstr: "Memory saved (id:",
            wantErr:    false,
        },
        {
            name:       "valid without tags",
            args:       map[string]any{"content": "another fact"},
            wantSubstr: "Memory saved (id:",
            wantErr:    false,
        },
        {
            name:       "missing content",
            args:       map[string]any{},
            wantSubstr: "error: content is required",
            wantErr:    true,
        },
        {
            name:       "empty content",
            args:       map[string]any{"content": ""},
            wantSubstr: "error: content is required",
            wantErr:    true,
        },
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            ag := newTestAgentWithMemory(t)
            result, isErr := ag.handleMemorySave(tt.args)
            if isErr != tt.wantErr {
                t.Errorf("handleMemorySave() isErr = %v, want %v", isErr, tt.wantErr)
            }
            if !strings.Contains(result, tt.wantSubstr) {
                t.Errorf("handleMemorySave() = %q, want substring %q", result, tt.wantSubstr)
            }
        })
    }
}

func TestHandleMemoryRecall(t *testing.T) {
    tests := []struct {
        name       string
        setup      func(ag *Agent)
        args       map[string]any
        wantSubstr string
        wantErr    bool
    }{
        {
            name: "valid recall finds saved memory",
            setup: func(ag *Agent) {
                _, _ = ag.memoryStore.Save("user prefers Go", []string{"language"})
            },
            args:       map[string]any{"query": "Go"},
            wantSubstr: "Found 1 matching memories:",
            wantErr:    false,
        },
        {
            name:       "missing query",
            setup:      func(ag *Agent) {},
            args:       map[string]any{},
            wantSubstr: "error: query is required",
            wantErr:    true,
        },
        {
            name:       "no matches",
            setup:      func(ag *Agent) {},
            args:       map[string]any{"query": "nonexistent"},
            wantSubstr: "No matching memories found.",
            wantErr:    false,
        },
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            ag := newTestAgentWithMemory(t)
            tt.setup(ag)
            result, isErr := ag.handleMemoryRecall(tt.args)
            if isErr != tt.wantErr {
                t.Errorf("handleMemoryRecall() isErr = %v, want %v", isErr, tt.wantErr)
            }
            if !strings.Contains(result, tt.wantSubstr) {
                t.Errorf("handleMemoryRecall() = %q, want substring %q", result, tt.wantSubstr)
            }
        })
    }
}