package main

// getString extracts a string value from a content map.
func getString(content map[string]any, key string) string {
	if v, ok := content[key].(string); ok {
		return v
	}
	return ""
}

// getStringDefault returns the string at key, falling back to def if missing/blank.
func getStringDefault(content map[string]any, key, def string) string {
	if v := getString(content, key); v != "" {
		return v
	}
	return def
}

// getBool extracts a boolean from a content map. Accepts native bool, string ("true"/"1"),
// or numeric truthiness. Returns def when no value is present or parseable.
func getBool(content map[string]any, key string, def bool) bool {
	if v, ok := content[key]; ok {
		switch t := v.(type) {
		case bool:
			return t
		case string:
			switch t {
			case "true", "TRUE", "True", "1", "yes", "on":
				return true
			case "false", "FALSE", "False", "0", "no", "off":
				return false
			}
		case float64:
			return t != 0
		case int:
			return t != 0
		}
	}
	return def
}

// getSlice extracts a slice of maps from content under key. Returns nil if not a slice.
func getSlice(content map[string]any, key string) []map[string]any {
	if v, ok := content[key].([]any); ok {
		out := make([]map[string]any, 0, len(v))
		for _, item := range v {
			if m, ok := item.(map[string]any); ok {
				out = append(out, m)
			}
		}
		return out
	}
	return nil
}

// getMap returns the map at key, or nil.
func getMap(content map[string]any, key string) map[string]any {
	if m, ok := content[key].(map[string]any); ok {
		return m
	}
	return nil
}

// getFloat returns the float at key, or def if missing / wrong type.
func getFloat(content map[string]any, key string, def float64) float64 {
	if v, ok := content[key].(float64); ok {
		return v
	}
	if v, ok := content[key].(int); ok {
		return float64(v)
	}
	return def
}

// normalizeTrend coerces an incoming trend string to {up, down, flat}, defaulting to flat.
func normalizeTrend(s string) string {
	switch s {
	case "up", "down", "flat":
		return s
	}
	return "flat"
}