<!-- [DEF:ConflictResolver:Component] -->
<!--
@SEMANTICS: git, conflict, resolution, merge
@PURPOSE:   UI for resolving merge conflicts (Keep Mine / Keep Theirs).
@LAYER:     Component
@RELATION:  DISPATCHES -> resolve

@INVARIANT: User must resolve all conflicts before saving.
-->

<script>
    // [SECTION: IMPORTS]
    import { createEventDispatcher } from "svelte";
    import { addToast as toast } from "../../lib/toasts.js";
    // [/SECTION]

    // [SECTION: PROPS]
    /** @type {Array<{file_path: string, mine: string, theirs: string}>} */
  let {
    conflicts = [],
    show = false,
  } = $props();

    // [/SECTION]

    // [SECTION: STATE]
    const dispatch = createEventDispatcher();
    /** @type {Object.<string, 'mine' | 'theirs' | 'manual'>} */
    let resolutions = $state({});
    // [/SECTION]

    // [DEF:resolve:Function]
    /**
     * @purpose Set resolution strategy for a file.
     * @pre     file path must exist in conflicts array.
     * @post    resolutions state is updated for the given file.
     * @param   {string} file - File path.
     * @param   {'mine'|'theirs'} strategy - Resolution strategy.
     * @side_effect Updates resolutions state.
     */
    function resolve(file, strategy) {
        console.log(
            `[ConflictResolver][Action] Resolving ${file} with ${strategy}`,
        );
        resolutions[file] = strategy;
        resolutions = { ...resolutions }; // Trigger update
    }
    // [/DEF:resolve:Function]

    // [DEF:handleSave:Function]
    /**
     * @purpose Validate and submit resolutions.
     * @pre     All conflicts must have a resolution.
     * @post    'resolve' event dispatched if valid.
     * @side_effect Dispatches event and closes modal.
     */
    function handleSave() {
        // 1. Guard Clause (@PRE)
        const unresolved = conflicts.filter((c) => !resolutions[c.file_path]);
        if (unresolved.length > 0) {
            console.warn(
                `[ConflictResolver][Coherence:Failed] ${unresolved.length} unresolved conflicts`,
            );
            toast(
                `Please resolve all conflicts first. (${unresolved.length} remaining)`,
                "error",
            );
            return;
        }

        // 2. Implementation
        console.log(`[ConflictResolver][Coherence:OK] All conflicts resolved`);
        dispatch("resolve", resolutions);
        show = false;
    }
    // [/DEF:handleSave:Function]
</script>

<!-- [SECTION: TEMPLATE] -->
{#if show}
    <div
        class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4"
    >
        <div
            class="bg-white p-6 rounded-lg shadow-xl w-full max-w-5xl max-h-[90vh] flex flex-col"
        >
            <h2 class="text-xl font-bold mb-4 text-red-600">
                Merge Conflicts Detected
            </h2>
            <p class="text-gray-600 mb-4">
                The following files have conflicts. Please choose how to resolve
                them.
            </p>

            <div class="flex-1 overflow-y-auto space-y-6 mb-4 pr-2">
                {#each conflicts as conflict}
                    <div class="border rounded-lg overflow-hidden">
                        <div
                            class="bg-gray-100 px-4 py-2 font-medium border-b flex justify-between items-center"
                        >
                            <span>{conflict.file_path}</span>
                            {#if resolutions[conflict.file_path]}
                                <span
                                    class="text-xs bg-blue-100 text-blue-700 px-2 py-0.5 rounded-full uppercase font-bold"
                                >
                                    Resolved: {resolutions[conflict.file_path]}
                                </span>
                            {/if}
                        </div>
                        <div
                            class="grid grid-cols-1 md:grid-cols-2 gap-0 divide-x"
                        >
                            <div class="p-0 flex flex-col">
                                <div
                                    class="bg-blue-50 px-4 py-1 text-[10px] font-bold text-blue-600 uppercase border-b"
                                >
                                    Your Changes (Mine)
                                </div>
                                <div class="p-4 bg-white flex-1 overflow-auto">
                                    <pre
                                        class="text-xs font-mono whitespace-pre">{conflict.mine}</pre>
                                </div>
                                <button
                                    class="w-full py-2 text-sm font-medium border-t transition-colors {resolutions[
                                        conflict.file_path
                                    ] === 'mine'
                                        ? 'bg-blue-600 text-white'
                                        : 'bg-gray-50 hover:bg-blue-50 text-blue-600'}"
                                    onclick={() =>
                                        resolve(conflict.file_path, "mine")}
                                >
                                    Keep Mine
                                </button>
                            </div>
                            <div class="p-0 flex flex-col">
                                <div
                                    class="bg-green-50 px-4 py-1 text-[10px] font-bold text-green-600 uppercase border-b"
                                >
                                    Remote Changes (Theirs)
                                </div>
                                <div class="p-4 bg-white flex-1 overflow-auto">
                                    <pre
                                        class="text-xs font-mono whitespace-pre">{conflict.theirs}</pre>
                                </div>
                                <button
                                    class="w-full py-2 text-sm font-medium border-t transition-colors {resolutions[
                                        conflict.file_path
                                    ] === 'theirs'
                                        ? 'bg-green-600 text-white'
                                        : 'bg-gray-50 hover:bg-green-50 text-green-600'}"
                                    onclick={() =>
                                        resolve(conflict.file_path, "theirs")}
                                >
                                    Keep Theirs
                                </button>
                            </div>
                        </div>
                    </div>
                {/each}
            </div>

            <div class="flex justify-end space-x-3 pt-4 border-t">
                <button
                    onclick={() => (show = false)}
                    class="px-4 py-2 text-gray-600 hover:bg-gray-100 rounded transition-colors"
                >
                    Cancel
                </button>
                <button
                    onclick={handleSave}
                    class="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700 transition-colors shadow-sm"
                >
                    Resolve & Continue
                </button>
            </div>
        </div>
    </div>
{/if}
<!-- [/SECTION] -->

<!-- [/DEF:ConflictResolver:Component] -->
