// RDEPUBSearchModels.swift
// EPUB 搜索相关数据模型
// 定义搜索匹配项（RDEPUBSearchMatch）、搜索结果（RDEPUBSearchResult）、
// 搜索状态（RDEPUBSearchState）和搜索展示（RDEPUBSearchPresentation）等数据结构。

import Foundation

/// 搜索匹配项，包含匹配位置、进度、预览文本和范围信息
public struct RDEPUBSearchMatch: Codable, Equatable {
    /// 匹配所在资源的规范化 href
    public var href: String
    /// 匹配位置在文本中的进度比例（0.0 ~ 1.0）
    public var progression: Double
    /// 匹配位置前后的预览文本
    public var previewText: String
    /// 在当前资源内的本地匹配索引
    public var localMatchIndex: Int
    /// 匹配范围的起始位置（字符偏移量）
    public var rangeLocation: Int?
    /// 匹配范围的长度
    public var rangeLength: Int
    /// 文本范围锚点（用于精确定位）
    public var rangeAnchor: RDEPUBTextRangeAnchor?

    public init(
        href: String,
        progression: Double,
        previewText: String,
        localMatchIndex: Int,
        rangeLocation: Int? = nil,
        rangeLength: Int,
        rangeAnchor: RDEPUBTextRangeAnchor? = nil
    ) {
        self.href = href
        self.progression = progression
        self.previewText = previewText
        self.localMatchIndex = localMatchIndex
        self.rangeLocation = rangeLocation
        self.rangeLength = rangeLength
        self.rangeAnchor = rangeAnchor
    }
}

/// 搜索结果摘要，包含关键词、总匹配数和当前匹配项
public struct RDEPUBSearchResult: Codable, Equatable {
    /// 搜索关键词
    public var keyword: String
    /// 总匹配数量
    public var totalMatchCount: Int
    /// 当前匹配项的索引（从 1 开始）
    public var currentMatchIndex: Int?
    /// 当前高亮的匹配项
    public var currentMatch: RDEPUBSearchMatch?

    public init(
        keyword: String,
        totalMatchCount: Int,
        currentMatchIndex: Int?,
        currentMatch: RDEPUBSearchMatch?
    ) {
        self.keyword = keyword
        self.totalMatchCount = totalMatchCount
        self.currentMatchIndex = currentMatchIndex
        self.currentMatch = currentMatch
    }
}

/// 搜索状态，管理关键词、匹配列表和当前索引
public struct RDEPUBSearchState: Codable, Equatable {
    /// 搜索关键词
    public var keyword: String
    /// 所有匹配项列表
    public var matches: [RDEPUBSearchMatch]
    /// 当前匹配项索引（从 0 开始）
    public var currentMatchIndex: Int?

    public init(keyword: String, matches: [RDEPUBSearchMatch], currentMatchIndex: Int? = nil) {
        self.keyword = keyword
        self.matches = matches
        self.currentMatchIndex = currentMatchIndex
    }

    /// 获取当前匹配项
    public var currentMatch: RDEPUBSearchMatch? {
        guard let currentMatchIndex,
              matches.indices.contains(currentMatchIndex) else {
            return nil
        }
        return matches[currentMatchIndex]
    }

    /// 转换为搜索结果摘要
    public var result: RDEPUBSearchResult {
        RDEPUBSearchResult(
            keyword: keyword,
            totalMatchCount: matches.count,
            currentMatchIndex: currentMatchIndex.map { $0 + 1 },
            currentMatch: currentMatch
        )
    }
}

/// 搜索展示的单个资源信息
public struct RDEPUBSearchPresentationResource: Codable, Equatable {
    /// 资源的规范化 href
    public var href: String
    /// 该资源内的匹配数量
    public var matchCount: Int
    /// 当前活跃的本地匹配索引
    public var activeLocalMatchIndex: Int?

    public init(href: String, matchCount: Int, activeLocalMatchIndex: Int? = nil) {
        self.href = href
        self.matchCount = matchCount
        self.activeLocalMatchIndex = activeLocalMatchIndex
    }
}

/// 搜索展示信息，传递给 JS 桥接脚本用于渲染搜索高亮
public struct RDEPUBSearchPresentation: Codable, Equatable {
    /// 搜索关键词
    public var keyword: String
    /// 各资源的搜索展示信息列表
    public var resources: [RDEPUBSearchPresentationResource]

    public init(keyword: String, resources: [RDEPUBSearchPresentationResource]) {
        self.keyword = keyword
        self.resources = resources
    }
}