/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

var Source = require("./Source");
var SourceNode = require("source-map").SourceNode;

class Replacement {
	constructor(start, end, content, insertIndex, name) {
		this.start = start;
		this.end = end;
		this.content = content;
		this.insertIndex = insertIndex;
		this.name = name;
	}
}

class ReplaceSource extends Source {
	constructor(source, name) {
		super();
		this._source = source;
		this._name = name;
		/** @type {Replacement[]} */
		this.replacements = [];
	}

	replace(start, end, newValue, name) {
		if(typeof newValue !== "string")
			throw new Error("insertion must be a string, but is a " + typeof newValue);
		this.replacements.push(new Replacement(start, end, newValue, this.replacements.length, name));
	}

	insert(pos, newValue, name) {
		if(typeof newValue !== "string")
			throw new Error("insertion must be a string, but is a " + typeof newValue + ": " + newValue);
		this.replacements.push(new Replacement(pos, pos - 1, newValue, this.replacements.length, name));
	}

	source(options) {
		return this._replaceString(this._source.source());
	}

	original() {
		return this._source;
	}

	_sortReplacements() {
		this.replacements.sort(function(a, b) {
			var diff = b.end - a.end;
			if(diff !== 0)
				return diff;
			diff = b.start - a.start;
			if(diff !== 0)
				return diff;
			return b.insertIndex - a.insertIndex;
		});
	}

	_replaceString(str) {
		if(typeof str !== "string")
			throw new Error("str must be a string, but is a " + typeof str + ": " + str);
		this._sortReplacements();
		var result = [str];
		this.replacements.forEach(function(repl) {
			var remSource = result.pop();
			var splitted1 = this._splitString(remSource, Math.floor(repl.end + 1));
			var splitted2 = this._splitString(splitted1[0], Math.floor(repl.start));
			result.push(splitted1[1], repl.content, splitted2[0]);
		}, this);

		// write out result array in reverse order
		let resultStr = "";
		for(let i = result.length - 1; i >= 0; --i) {
			resultStr += result[i];
		}
		return resultStr;
	}

	node(options) {
		var node = this._source.node(options);
		if(this.replacements.length === 0) {
			return node;
		}
		this._sortReplacements();
		var replace = new ReplacementEnumerator(this.replacements);
		var output = [];
		var position = 0;
		var sources = Object.create(null);
		var sourcesInLines = Object.create(null);

		// We build a new list of SourceNodes in "output"
		// from the original mapping data

		var result = new SourceNode();

		// We need to add source contents manually
		// because "walk" will not handle it
		node.walkSourceContents(function(sourceFile, sourceContent) {
			result.setSourceContent(sourceFile, sourceContent);
			sources["$" + sourceFile] = sourceContent;
		});

		var replaceInStringNode = this._replaceInStringNode.bind(this, output, replace, function getOriginalSource(mapping) {
			var key = "$" + mapping.source;
			var lines = sourcesInLines[key];
			if(!lines) {
				var source = sources[key];
				if(!source) return null;
				lines = source.split("\n").map(function(line) {
					return line + "\n";
				});
				sourcesInLines[key] = lines;
			}
			// line is 1-based
			if(mapping.line > lines.length) return null;
			var line = lines[mapping.line - 1];
			return line.substr(mapping.column);
		});

		node.walk(function(chunk, mapping) {
			position = replaceInStringNode(chunk, position, mapping);
		});

		// If any replacements occur after the end of the original file, then we append them
		// directly to the end of the output
		var remaining = replace.footer();
		if(remaining) {
			output.push(remaining);
		}

		result.add(output);

		return result;
	}

	listMap(options) {
		this._sortReplacements();
		var map = this._source.listMap(options);
		var currentIndex = 0;
		var replacements = this.replacements;
		var idxReplacement = replacements.length - 1;
		var removeChars = 0;
		map = map.mapGeneratedCode(function(str) {
			var newCurrentIndex = currentIndex + str.length;
			if(removeChars > str.length) {
				removeChars -= str.length;
				str = "";
			} else {
				if(removeChars > 0) {
					str = str.substr(removeChars);
					currentIndex += removeChars;
					removeChars = 0;
				}
				var finalStr = "";
				while(idxReplacement >= 0 && replacements[idxReplacement].start < newCurrentIndex) {
					var repl = replacements[idxReplacement];
					var start = Math.floor(repl.start);
					var end = Math.floor(repl.end + 1);
					var before = str.substr(0, Math.max(0, start - currentIndex));
					if(end <= newCurrentIndex) {
						var after = str.substr(Math.max(0, end - currentIndex));
						finalStr += before + repl.content;
						str = after;
						currentIndex = Math.max(currentIndex, end);
					} else {
						finalStr += before + repl.content;
						str = "";
						removeChars = end - newCurrentIndex;
					}
					idxReplacement--;
				}
				str = finalStr + str;
			}
			currentIndex = newCurrentIndex;
			return str;
		});
		var extraCode = "";
		while(idxReplacement >= 0) {
			extraCode += replacements[idxReplacement].content;
			idxReplacement--;
		}
		if(extraCode) {
			map.add(extraCode);
		}
		return map;
	}

	_splitString(str, position) {
		return position <= 0 ? ["", str] : [str.substr(0, position), str.substr(position)];
	}

	_replaceInStringNode(output, replace, getOriginalSource, node, position, mapping) {
		var original = undefined;

		do {
			var splitPosition = replace.position - position;
			// If multiple replaces occur in the same location then the splitPosition may be
			// before the current position for the subsequent splits. Ensure it is >= 0
			if(splitPosition < 0) {
				splitPosition = 0;
			}
			if(splitPosition >= node.length || replace.done) {
				if(replace.emit) {
					var nodeEnd = new SourceNode(
						mapping.line,
						mapping.column,
						mapping.source,
						node,
						mapping.name
					);
					output.push(nodeEnd);
				}
				return position + node.length;
			}

			var originalColumn = mapping.column;

			// Try to figure out if generated code matches original code of this segement
			// If this is the case we assume that it's allowed to move mapping.column
			// Because getOriginalSource can be expensive we only do it when neccessary

			var nodePart;
			if(splitPosition > 0) {
				nodePart = node.slice(0, splitPosition);
				if(original === undefined) {
					original = getOriginalSource(mapping);
				}
				if(original && original.length >= splitPosition && original.startsWith(nodePart)) {
					mapping.column += splitPosition;
					original = original.substr(splitPosition);
				}
			}

			var emit = replace.next();
			if(!emit) {
				// Stop emitting when we have found the beginning of the string to replace.
				// Emit the part of the string before splitPosition
				if(splitPosition > 0) {
					var nodeStart = new SourceNode(
						mapping.line,
						originalColumn,
						mapping.source,
						nodePart,
						mapping.name
					);
					output.push(nodeStart);
				}

				// Emit the replacement value
				if(replace.value) {
					output.push(new SourceNode(
						mapping.line,
						mapping.column,
						mapping.source,
						replace.value,
						mapping.name || replace.name
					));
				}
			}

			// Recurse with remainder of the string as there may be multiple replaces within a single node
			node = node.substr(splitPosition);
			position += splitPosition;
		} while (true);
	}
}

class ReplacementEnumerator {
	/**
	 * @param {Replacement[]} replacements list of replacements
	 */
	constructor(replacements) {
		this.replacements = replacements || [];
		this.index = this.replacements.length;
		this.done = false;
		this.emit = false;
		// Set initial start position
		this.next();
	}

	next() {
		if(this.done)
			return true;
		if(this.emit) {
			// Start point found. stop emitting. set position to find end
			var repl = this.replacements[this.index];
			var end = Math.floor(repl.end + 1);
			this.position = end;
			this.value = repl.content;
			this.name = repl.name;
		} else {
			// End point found. start emitting. set position to find next start
			this.index--;
			if(this.index < 0) {
				this.done = true;
			} else {
				var nextRepl = this.replacements[this.index];
				var start = Math.floor(nextRepl.start);
				this.position = start;
			}
		}
		if(this.position < 0)
			this.position = 0;
		this.emit = !this.emit;
		return this.emit;
	}

	footer() {
		if(!this.done && !this.emit)
			this.next(); // If we finished _replaceInNode mid emit we advance to next entry
		if(this.done) {
			return [];
		} else {
			var resultStr = "";
			for(var i = this.index; i >= 0; i--) {
				var repl = this.replacements[i];
				// this doesn't need to handle repl.name, because in SourceMaps generated code
				// without pointer to original source can't have a name
				resultStr += repl.content;
			}
			return resultStr;
		}
	}
}

require("./SourceAndMapMixin")(ReplaceSource.prototype);

module.exports = ReplaceSource;
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