package cache

import (
	"testing"

	"github.com/metamorphosis-dev/samsa/internal/contracts"
)

func TestKey_Deterministic(t *testing.T) {
	req := contracts.SearchRequest{
		Format:     contracts.FormatJSON,
		Query:      "samsa metamorphosis",
		Pageno:     1,
		Safesearch: 0,
		Language:   "auto",
		Engines:    []string{"wikipedia", "braveapi"},
		Categories: []string{"general"},
	}

	key1 := Key(req)
	key2 := Key(req)

	if key1 != key2 {
		t.Errorf("Key should be deterministic: %q != %q", key1, key2)
	}
	if len(key1) != 32 {
		t.Errorf("expected 32-char key, got %d", len(key1))
	}
}

func TestKey_DifferentQueries(t *testing.T) {
	reqA := contracts.SearchRequest{Query: "samsa", Format: contracts.FormatJSON}
	reqB := contracts.SearchRequest{Query: "orwell", Format: contracts.FormatJSON}

	if Key(reqA) == Key(reqB) {
		t.Error("different queries should produce different keys")
	}
}

func TestKey_DifferentPageno(t *testing.T) {
	req1 := contracts.SearchRequest{Query: "test", Pageno: 1}
	req2 := contracts.SearchRequest{Query: "test", Pageno: 2}

	if Key(req1) == Key(req2) {
		t.Error("different pageno should produce different keys")
	}
}

func TestKey_DifferentEngines(t *testing.T) {
	req1 := contracts.SearchRequest{Query: "test", Engines: []string{"wikipedia"}}
	req2 := contracts.SearchRequest{Query: "test", Engines: []string{"braveapi"}}

	if Key(req1) == Key(req2) {
		t.Error("different engines should produce different keys")
	}
}

func TestKey_TimeRange(t *testing.T) {
	req1 := contracts.SearchRequest{Query: "test"}
	req2 := contracts.SearchRequest{Query: "test", TimeRange: strPtr("week")}

	if Key(req1) == Key(req2) {
		t.Error("with/without time_range should produce different keys")
	}
}

func TestNew_NopWithoutAddress(t *testing.T) {
	c := New(Config{}, nil)
	if c.Enabled() {
		t.Error("cache should be disabled when no address is configured")
	}
	if err := c.Close(); err != nil {
		t.Errorf("Close on nop cache should not error: %v", err)
	}
}

func strPtr(s string) *string { return &s }

func TestQueryHash(t *testing.T) {
	// Same params should produce same hash
	hash1 := QueryHash("golang", 1, 0, "en", "")
	hash2 := QueryHash("golang", 1, 0, "en", "")
	if hash1 != hash2 {
		t.Errorf("QueryHash: same params should produce same hash, got %s != %s", hash1, hash2)
	}

	// Different query should produce different hash
	hash3 := QueryHash("rust", 1, 0, "en", "")
	if hash1 == hash3 {
		t.Errorf("QueryHash: different queries should produce different hash")
	}

	// Different pageno should produce different hash
	hash4 := QueryHash("golang", 2, 0, "en", "")
	if hash1 == hash4 {
		t.Errorf("QueryHash: different pageno should produce different hash")
	}

	// time_range should affect hash
	hash5 := QueryHash("golang", 1, 0, "en", "day")
	if hash1 == hash5 {
		t.Errorf("QueryHash: different time_range should produce different hash")
	}

	// Hash should be 16 characters (truncated SHA-256)
	if len(hash1) != 16 {
		t.Errorf("QueryHash: expected 16 char hash, got %d", len(hash1))
	}
}