package app

import (
	"context"
	"crypto/sha1"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"time"

	sharedcache "github.com/geo-platform/tenant-api/internal/shared/cache"
)

const (
	defaultReadCacheTTL      = 5 * time.Minute
	defaultReadCacheEmptyTTL = 1 * time.Minute
)

func defaultCacheTTL() time.Duration {
	return defaultReadCacheTTL
}

func defaultCacheEmptyTTL() time.Duration {
	return defaultReadCacheEmptyTTL
}

func digestCacheKey(value interface{}) string {
	raw, err := json.Marshal(value)
	if err != nil {
		return "fallback"
	}

	sum := sha1.Sum(raw)
	return hex.EncodeToString(sum[:8])
}

func deleteCacheKey(ctx context.Context, c sharedcache.Cache, key string) {
	if c == nil || key == "" {
		return
	}
	_ = c.Delete(ctx, key)
}

func deleteCachePrefix(ctx context.Context, c sharedcache.Cache, prefix string) {
	if c == nil || prefix == "" {
		return
	}
	_ = c.DeletePrefix(ctx, prefix)
}

func workspaceOverviewCacheKey(tenantID int64) string {
	return fmt.Sprintf("workspace:overview:%d", tenantID)
}

func workspaceRecentArticlesCacheKey(tenantID int64) string {
	return fmt.Sprintf("workspace:recent_articles:%d", tenantID)
}

func workspaceQuotaSummaryCacheKey(tenantID int64) string {
	return fmt.Sprintf("workspace:quota_summary:%d", tenantID)
}

func workspaceTemplateCardsCacheKey(tenantID int64) string {
	return fmt.Sprintf("workspace:template_cards:%d", tenantID)
}

func invalidateWorkspaceCaches(ctx context.Context, c sharedcache.Cache, tenantID int64) {
	deleteCacheKey(ctx, c, workspaceOverviewCacheKey(tenantID))
	deleteCacheKey(ctx, c, workspaceRecentArticlesCacheKey(tenantID))
	deleteCacheKey(ctx, c, workspaceQuotaSummaryCacheKey(tenantID))
	deleteCacheKey(ctx, c, workspaceTemplateCardsCacheKey(tenantID))
}

func brandListCacheKey(tenantID int64) string {
	return fmt.Sprintf("brand:list:%d", tenantID)
}

func brandLibrarySummaryCacheKey(tenantID int64) string {
	return fmt.Sprintf("brand:library_summary:%d", tenantID)
}

func brandDetailCacheKey(tenantID, brandID int64) string {
	return fmt.Sprintf("brand:detail:%d:%d", tenantID, brandID)
}

func brandKeywordsCachePrefix(tenantID, brandID int64) string {
	return fmt.Sprintf("brand:keywords:%d:%d:", tenantID, brandID)
}

func brandKeywordsCacheKey(tenantID, brandID int64) string {
	return brandKeywordsCachePrefix(tenantID, brandID) + "all"
}

func brandQuestionsCachePrefix(tenantID, brandID int64) string {
	return fmt.Sprintf("brand:questions:%d:%d:", tenantID, brandID)
}

func brandQuestionsCacheKey(tenantID, brandID int64, keywordID *int64) string {
	return fmt.Sprintf("%s%s", brandQuestionsCachePrefix(tenantID, brandID), digestCacheKey(struct {
		KeywordID *int64 `json:"keyword_id,omitempty"`
	}{
		KeywordID: keywordID,
	}))
}

func brandCompetitorsCachePrefix(tenantID, brandID int64) string {
	return fmt.Sprintf("brand:competitors:%d:%d:", tenantID, brandID)
}

func brandCompetitorsCacheKey(tenantID, brandID int64) string {
	return brandCompetitorsCachePrefix(tenantID, brandID) + "all"
}

func scheduleTaskListCachePrefix(tenantID int64) string {
	return fmt.Sprintf("schedule_task:list:%d:", tenantID)
}

func scheduleTaskDetailCachePrefix(tenantID int64) string {
	return fmt.Sprintf("schedule_task:detail:%d:", tenantID)
}

func invalidateBrandCaches(ctx context.Context, c sharedcache.Cache, tenantID, brandID int64) {
	deleteCacheKey(ctx, c, brandDetailCacheKey(tenantID, brandID))
	deleteCachePrefix(ctx, c, brandKeywordsCachePrefix(tenantID, brandID))
	deleteCachePrefix(ctx, c, brandQuestionsCachePrefix(tenantID, brandID))
	deleteCachePrefix(ctx, c, brandCompetitorsCachePrefix(tenantID, brandID))
	deleteCacheKey(ctx, c, brandListCacheKey(tenantID))
	deleteCacheKey(ctx, c, brandLibrarySummaryCacheKey(tenantID))
	deleteCachePrefix(ctx, c, scheduleTaskListCachePrefix(tenantID))
	deleteCachePrefix(ctx, c, scheduleTaskDetailCachePrefix(tenantID))
	invalidateWorkspaceCaches(ctx, c, tenantID)
}

func promptRuleGroupsCacheKey(tenantID int64) string {
	return fmt.Sprintf("prompt_rule:groups:%d", tenantID)
}

func promptRuleSimpleCacheKey(tenantID int64) string {
	return fmt.Sprintf("prompt_rule:simple:%d", tenantID)
}

func promptRuleDetailCachePrefix(tenantID int64) string {
	return fmt.Sprintf("prompt_rule:detail:%d:", tenantID)
}

func promptRuleDetailCacheKey(tenantID, ruleID int64) string {
	return fmt.Sprintf("%s%d", promptRuleDetailCachePrefix(tenantID), ruleID)
}

func promptRuleListCachePrefix(tenantID int64) string {
	return fmt.Sprintf("prompt_rule:list:%d:", tenantID)
}

func promptRuleListCacheKey(tenantID int64, params interface{}) string {
	return promptRuleListCachePrefix(tenantID) + digestCacheKey(params)
}

func articleListCachePrefix(tenantID int64) string {
	return fmt.Sprintf("article:list:%d:", tenantID)
}

func invalidatePromptRuleCaches(ctx context.Context, c sharedcache.Cache, tenantID int64, ruleID *int64) {
	deleteCacheKey(ctx, c, promptRuleGroupsCacheKey(tenantID))
	deleteCacheKey(ctx, c, promptRuleSimpleCacheKey(tenantID))
	deleteCachePrefix(ctx, c, promptRuleListCachePrefix(tenantID))
	if ruleID != nil && *ruleID > 0 {
		deleteCacheKey(ctx, c, promptRuleDetailCacheKey(tenantID, *ruleID))
	} else {
		deleteCachePrefix(ctx, c, promptRuleDetailCachePrefix(tenantID))
	}
	deleteCachePrefix(ctx, c, scheduleTaskListCachePrefix(tenantID))
	deleteCachePrefix(ctx, c, scheduleTaskDetailCachePrefix(tenantID))
	deleteCachePrefix(ctx, c, articleListCachePrefix(tenantID))
}

func scheduleTaskDetailCacheKey(tenantID, taskID int64) string {
	return fmt.Sprintf("%s%d", scheduleTaskDetailCachePrefix(tenantID), taskID)
}

func scheduleTaskListCacheKey(tenantID int64, params interface{}) string {
	return scheduleTaskListCachePrefix(tenantID) + digestCacheKey(params)
}

func invalidateScheduleTaskCaches(ctx context.Context, c sharedcache.Cache, tenantID int64, taskID *int64) {
	deleteCachePrefix(ctx, c, scheduleTaskListCachePrefix(tenantID))
	if taskID != nil && *taskID > 0 {
		deleteCacheKey(ctx, c, scheduleTaskDetailCacheKey(tenantID, *taskID))
	} else {
		deleteCachePrefix(ctx, c, scheduleTaskDetailCachePrefix(tenantID))
	}
}

func InvalidateScheduleTaskCaches(ctx context.Context, c sharedcache.Cache, tenantID int64, taskID *int64) {
	invalidateScheduleTaskCaches(ctx, c, tenantID, taskID)
}

func articleDetailCachePrefix(tenantID int64) string {
	return fmt.Sprintf("article:detail:%d:", tenantID)
}

func articleDetailCacheKey(tenantID, articleID int64) string {
	return fmt.Sprintf("%s%d", articleDetailCachePrefix(tenantID), articleID)
}

func articleListCacheKey(tenantID int64, params interface{}) string {
	return articleListCachePrefix(tenantID) + digestCacheKey(params)
}

func invalidateArticleCaches(ctx context.Context, c sharedcache.Cache, tenantID int64, articleID *int64) {
	deleteCachePrefix(ctx, c, articleListCachePrefix(tenantID))
	if articleID != nil && *articleID > 0 {
		deleteCacheKey(ctx, c, articleDetailCacheKey(tenantID, *articleID))
	} else {
		deleteCachePrefix(ctx, c, articleDetailCachePrefix(tenantID))
	}
	invalidateWorkspaceCaches(ctx, c, tenantID)
}